Entries |
Document | Title | Date |
20080199202 | Image forming apparatus - An image forming apparatus is supplied which is able to eliminate redundant item in checking and adjusting print quality before executing print process and only perform item check being really necessary so as to reduce waiting time of user. In the image forming apparatus, a non-operation time calculating section | 08-21-2008 |
20080199203 | IMAGE FORMING APPARATUS - An image forming apparatus including: a main body; a cover rotatably connected to the main body; a power-supply unit to generate a first power-supply voltage and a second power-supply voltage; an image forming engine to receive the first power-supply voltage from the power-supply unit; a control unit to receive the second power-supply voltage from the power-supply unit, and to stop an operation of the image forming engine, when the second power-supply voltage is cutoff. The image forming apparatus further includes a power-supply cutoff unit that delays a cutoff time of the first power-supply voltage, as compared to a cutoff time of the second power-supply voltage, according to an opening of the cover. The cutoff unit includes a first switch to cutoff first power-supply voltage to the image forming engine, and a second switch to cutoff the second power-supply voltage to control unit. The first and second switches are sequentially switched off when the cover is opened. The first and second switches are arranged to cutoff the second power-supply voltage before the first power-supply voltage is cutoff. | 08-21-2008 |
20080226330 | APPARATUS FOR IMAGE FORMATION - An apparatus for image formation comprises a fixing unit, first to fourth switching units, a DC power supply unit, an accumulating unit, a charging unit, and a switching control unit. The first switching unit switches the state of connection between the fixing unit and a commercial power source. The DC power supply unit supplies another electric load of the apparatus than the fixing unit with DC power. The second switching unit switches the state of connection between the DC power supply unit and the commercial power source. The third switching unit switches the state of connection between the charging unit and the commercial power source. The fourth switching unit switches the state of connection between the accumulating unit and the electric load. Based on the state of conduction of the first switching unit, the switching control unit switches the states of conduction of the other three switching units. | 09-18-2008 |
20080253794 | Method and control unit for controlling the power supplied to a plurality of heat sources in a printer - A control unit for a printing apparatus has a plurality of heat sources, each heat source being operable at an individual power level. The control unit is configured to control the power supplied to the heat sources such that, at each instant, the sum of the delivered individual power levels is less than or equal to a maximum allowable power. The control unit is also configured to control the power delivered to the heat sources on the basis of sequential cycles and for each cycle, to receive for each heat source a requested power pulse duration, to schedule within the cycle instants at which power is to be delivered to the heat sources, based on the individual power levels and requested pulse durations and to deliver the power according to the scheduled instants within the cycle. | 10-16-2008 |
20080260415 | FIXING APPARATUS AND IMAGE PROCESSING APPARATUS - A fixing apparatus includes a heating roller which provides heat to a developer-holding medium holding a developer image, a pressurizing roller which is in contact with the heating roller, a heating device having a plurality of heating members which heat the heating roller, a first thermoelectric converting section having a plurality of thermoelectric converting elements, each of which has a heat-absorbing surface and a cooling surface and generates electromotive force by difference in temperature between the heat-absorbing surface and the cooling surface, and formed along a curved surface of the heating roller, in which the heat-absorbing surface is disposed with a predetermined space from an outer circumferential surface of the heating roller, an auxiliary power supply charged with electric power generated by the first thermoelectric converting section, and a switching section which switches the apparatus between a first state in which electric power is supplied from utility power to the heating members and a second state in which electric power is supplied from the auxiliary power supply to the heating members, based on a predetermined signal. | 10-23-2008 |
20080260416 | IMAGE FORMING APPARATUS AND OPERATION SYSTEM FOR IMAGE FORMING APPARATUS - The present invention includes a plurality of image forming apparatuses connected to a network, and a server which controls the operation state of the image forming apparatuses via the network. The image forming apparatuses are operable in a normal operation mode and in one of plural power-saving modes with different power consumption. The server individually sets the operation mode of the image forming apparatuses in accordance with a preset power-saving operation policy, and controls the image forming apparatuses so that each of the image forming apparatuses operates in the preset operation mode in each predetermined time band. | 10-23-2008 |
20080304850 | Variable speed printing device with mains overload prevention - An image reproduction device includes a print processing system and a print sheet conveying system that conveys sheets with a continuously variable and dynamically adjustable processing speed. The device lowers the processing speed when the mains connection cannot deliver sufficient power to run at a nominal processing speed and is provided with a current monitor unit for monitoring total electrical current drawn by the device from the mains connection and a control unit connected to the current monitor unit and arranged for dynamically adjusting the processing speed to a lower value when the total electrical current is above a preset maximum value. The control unit regulates the lower processing speed value to make sure that the total electrical current drawn by the device from the mains connection is kept substantially equal to the preset maximum current value until the mains power is again sufficient for running at nominal processing speed. | 12-11-2008 |
20080304851 | POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A power supply includes a transformer to transform an input voltage into an output driving voltage for one of a plurality of components of an image forming apparatus, and an output converter to detect the driving voltage being output from the transformer, to amplify the detected driving voltage according to a power control signal, and to output the amplified driving voltage to at least one remaining component in the plurality of components of the image forming apparatus. The power supply can not only control high voltage outputs individually, but also reduces the number of switching transformers being used, as it uses at least one shared switching transformer. | 12-11-2008 |
20080304852 | ENERGY STORAGE DEVICE, IMAGE FORMING APPARATUS INCLUDING ENERGY STORAGE DEVICE, AND DISCHARGE CONTROL METHOD - An energy storage device is disclosed that includes capacitor cells of a first type having a first internal resistance and 0 capacitor cells of a second type having a second internal resistance which is higher than the first internal resistance. | 12-11-2008 |
20090010671 | POWER SUPPLY CONTROL APPARATUS, POWER SUPPLY CONTROL METHOD, AND POWER SUPPLY CONTROL SOFTWARE PROGRAM - The device comprises a first power supply | 01-08-2009 |
20090035007 | IMAGE FORMING APPARATUS - An image forming apparatus includes a printing engine to form an image on a printing medium through printing processes, an engine frame to support the printing engine having a driving system to drive the printing engine, a high voltage power supply provided in a surface of the engine frame to apply a high voltage to at least one of units performing the printing processes, a main board provided in a surface of the engine frame adjacent to the surface having the high voltage power supply, and having a system engine controller to control the printing engine and a video controller to control a video signal, first and second main connectors respectively provided at lateral sides of the high voltage power supply and the main board adjacent to each other, and a connection control line to connect the first and second main connectors. | 02-05-2009 |
20090035008 | Image Forming Apparatus - An image forming apparatus capable of shortening a time needed for the assembly work is provided. The image forming apparatus of the invention comprises a low-voltage power supply and a housing, wherein the low-voltage power supply includes a substrate provided with a low-voltage power supply circuit, a pair of connection cords each connected to the substrate and an external power supply, a casing made of metal and provided with an accommodation portion inside which the substrate is fixed and a notch located on an opening edge of the accommodation portion, a lid body made of metal and configured to cover the accommodation portion and to define a cord insertion port by closing the notch, and a ring body made of resin and inserted into the notch in a state where both the connection cords are inserted in the ring body and to be attached to the cord insertion port. | 02-05-2009 |
20090047034 | FUSING CIRCUIT FOR DRIVING OPERATION OF HEATING UNIT IN AN IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus is provided with: a heating unit which generates heat to fuse a toner on a printing medium; a switch which selectively supplies alternating current (AC) power to the heating unit; a first switching driver which drives the switch to supply the AC power to the heating unit; and a first supply limiter which allows the AC power to be supplied to the heating unit by the first switching driver if a polarity of the AC power is the same as a preset polarity, and cuts off the AC power supplied to the heating unit if the polarity of the AC power is opposite to the preset polarity. | 02-19-2009 |
20090052932 | IMAGE FORMING APPARATUS AND HIGH VOLTAGE OUTPUT POWER SOURCE - A power source includes a voltage setting unit configured to set an output voltage, a voltage generation unit configured to output the set voltage to a load, a feedback unit configured to detect the output voltage and feed back the detected voltage to the voltage setting unit, a current detection unit configured to detect a current value which is a sum of a current value flowing in the feedback unit and a current value flowing in the load when the set voltage is output to the load, and a control unit configured to switch between a constant current control which controls the set voltage so that the detected current value becomes a constant current, and a constant voltage control which controls the set voltage so that the voltage output to the load becomes a constant voltage based on the voltage value that is fed back by the feedback unit. | 02-26-2009 |
20090060556 | Dual-Range Power Supply For An Image Forming Device - The embodiments disclosed herein are directed to methods and devices for a control system to regulate the output voltage of a high voltage power supply (HVPS) in an image forming device. In one embodiment, the HVPS comprises at least two voltage sources connected in series. A print engine controller is configured to disable at least one of the voltage sources when a voltage draw of a load exceeds a maximum differential voltage of the at least two voltage sources. | 03-05-2009 |
20090060557 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus provided with an image forming section and a fixing section, comprising: a memory section which stores relationships between a plurality of instruction forms of image formation and a plurality of power supply methods including a power supply by both an AC power source and a capacitor to the fixing section and a power supply only by the AC power source to the fixing section; and a controller, when receiving an instruction of image formation, that refers to the memory section on a basis of an instruction form of the received instruction of image formation and supplies power by both the AC power source and capacitor to the fixing section, or supplies power only by the AC power source to the fixing section. | 03-05-2009 |
20090060558 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus which is capable of reducing the number of times a second member is separated from a first member upon entry into power-save mode, thereby minimizing failures of a separation unit. A pressure-roller separating mechanism is provided so as to abut and separate a pressure roller and a fixing roller against/from each other. The image forming apparatus is controlled to change to a power-save mode in which power consumption of the image forming apparatus is reduced. The pressure-roller separating mechanism is controlled to separate the pressure roller and the fixing roller from each other in the power-save mode based on a measurement result measured by a timer, and the power-save mode is maintained after the pressure roller and the fixing roller are separated from each other. | 03-05-2009 |
20090060559 | Liquid ejecting apparatus - A liquid ejecting apparatus includes a record head having nozzles that discharge liquid; a transporting path along which a medium is transported; a transporting mechanism that transports the medium along the transporting path; a sensor including a light-emitting element and a light-receiving element and disposed at a first position on the transporting path, the first position being located upstream relative to the record head in a transporting direction of the medium, the sensor outputting a signal in accordance with presence or absence of the medium at the first position; and a control unit that controls supply of power to the sensor and detects the presence or absence of the medium through the sensor. The control unit stops the supply of power to the sensor when the control unit detects a downstream end of the medium in the transporting direction, and resumes the supply of power to the sensor when the control unit detects an upstream end of the medium in the transporting direction. | 03-05-2009 |
20090080931 | AUXILIARY POWER SUPPLY APPARATUS - An auxiliary power supply apparatus according to an example of the invention includes a first charge storage unit connected in parallel to an external resistance, a second charge storage unit connected in parallel to the external resistance, and a first switch to change a state in which the first charge storage device and the second charge storage device are connected in parallel to the external resistance to a state in which the first charge storage device and the second charge storage device are connected in series to the external resistance. | 03-26-2009 |
20090110427 | PRINTING APPARATUS - An aspect of the invention provides a printing apparatus having a plurality of operation modes that comprises: a storage unit configured to store power consumption values per unit time for each operation mode and a standard power consumption value indicating an energy-saving standard power consumption during a determined period of use; an operation mode management unit configured to measure an operation time of the printing apparatus for each operation mode; a calculator configured to calculate an estimated total power consumption value during the determined period of use from measured operation time in each operation mode and from the power consumption values stored in the storage unit; and a display unit configured to display both of the standard power consumption value obtained from the storage unit and the calculated estimated total power consumption value. | 04-30-2009 |
20090129808 | IMAGE FORMING APPARATUS, AND CONTROL METHOD THEREOF - An image forming apparatus of the invention includes, in the image forming apparatus having a normal operation mode and plural power saving modes, a control unit to decide between the normal operation mode and the plural power saving modes, and plural switching power sources that can independently change switching frequencies according to the power saving mode instructed from the control unit. | 05-21-2009 |
20090129809 | APPARATUS TO GENERATE HIGH VOLTAGE BY DIGITAL CONTROL AND METHOD THEREOF - An apparatus to generate a high voltage includes a switching part to control a voltage induced in a secondary coil of a power transforming part, by interrupting a current in a primary coil of the power transforming part, a digital controlling part to control the interruption operation of the switching part according to supplied control data. The switching part, the digital interfacing part and the digital controlling part may be embodied in an ASIC chip (application-specific integrated circuit). An optimum control according to an output state of the apparatus is easily achieved, manufacturing time for tuning each parameter is reduced and heat generation in the apparatus is reduced. | 05-21-2009 |
20090214244 | Image Forming Apparatus - An image forming apparatus includes a body casing, a fixing part, an inlet terminal and an interfering member. The fixing part is removably mounted inside the body casing and fixes a developer image onto a recording medium. The inlet terminal is provided inside the body casing, and a power cord for supplying power from an exterior is connected to the inlet terminal. The interfering member is provided at the fixing part, interposed between a predetermined part of the power cord and the inlet terminal in a state where the power cord is connected to the inlet terminal, and interferes with the predetermined part when the fixing part is moved in a removing direction with respect to the body casing. | 08-27-2009 |
20090214245 | Image Forming Apparatus - An image forming apparatus includes a body frame defining an opening configured to receive a cartridge installed in an installation direction, and a power supply terminal disposed on the body frame. The power supply terminal can be configured to supply power to an installed cartridge by making contact with a power supplied portion disposed in the cartridge The power supply terminal may include a main body protruding from the body frame toward the opening and extending from an upstream side, with respect to the installation direction, toward a downstream side, and an engaging portion disposed upstream from the main body in the installation direction and protruding in a direction orthogonal to the installation direction. The engaging portion may be configured to engage the body frame. | 08-27-2009 |
20090214246 | HEATING DEVICE AND IMAGE FORMING APPARATUS - A controller outputs a heater control signal in synchronization with a rise in a zero-cross signal. In response to the heater control signal, a switching device of a heater driving circuit switches ON/OFF. However, a noise occurs in an output voltage of an AC power source at the time of switching, and this noise causes a false zero-cross signal. For the purpose of preventing operation of a heater in accordance with the false zero-cross signal, the controller disregards the rise in the zero-cross signal during a set time period after the rise in the heater control signal. | 08-27-2009 |
20090214247 | IMAGE FORMING APPARATUS - It is possible to provide a technique capable of attaching a reactor to a power source unit even upon shipping a package containing an image forming apparatus from a factory as well as opening the package and installing the image forming apparatus in a place for installment, by optionally attaching the reactor to the power source unit. | 08-27-2009 |
20090220269 | DEVELOPER CARTRIDGE - A developer cartridge is provided, which includes a toner cartridge, a developer stirring device located in the toner cartridge, a supply roller for supplying a developer to a developer roller, a developer roller for developing an electrostatic latent image on a photoconductor, and a power receptor for driving only one of gear sets of the above means to receive a power. The power receptor is rotatably fixed at two or more predetermined positions. An initial position of the power receptor is a power receiving position. A power receptor moving device includes a press block, a baffle block, a spring, and a torsion spring. The power receptor moving device is controlled by the press block. When the press block of the power receptor moving device is pressed downwards, the power receptor is rotated to another power receiving position due to the action of the torsion spring. The present invention is applicable to various types of machines. | 09-03-2009 |
20090220270 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus having a normal mode and a standby mode includes an image forming unit to form an image, a switching unit which selectively allows power to be supplied to the image forming unit, a controller to control the switching unit based on a phase signal of the power, a power cut-off unit which cuts off the power to the image forming unit in the standby mode, and a phase detector which is connected to both ends of the power cut-off unit, detects a phase of the power via different phase detection routes according to whether being in the normal mode or in the standby mode, and outputs the phase signal of the power so that a power consumption of the image forming apparatus does not exceed a predetermined value in the standby mode. | 09-03-2009 |
20090245847 | FIXER DRIVING DEVICE AND FIXER DRIVING METHOD - A voltage detecting circuit | 10-01-2009 |
20090279915 | METHOD AND APPARATUS FOR GENERATING A SPREAD SPECTRUM SIGNAL IN A PRINTER POWER SUPPLY UNIT - A method and apparatus that generates a spread spectrum signal in a printer power supply unit is disclosed. The method may include receiving an enable signal to power on the printer power supply unit, generating an initial power signal for the printer power supply unit based on the signal received from the power supply controller, the initial power signal being generated in a predetermined frequency range around a predetermined center frequency value, powering on the printer power supply unit using the generated initial power signal, repeatedly updating the initial power signal, wherein the updated power signal has a frequency value in the predetermined frequency range and the predetermined center frequency value is maintained, and powering the printer power supply unit using the updated power signal. | 11-12-2009 |
20090297201 | IMAGE HEATING APPARATUS - An image heating apparatus includes an image heating rotational member configured to heat an image on a recording material, a pressure member configured to form a nip portion with the image heating rotational member and pinch the heated recording material in the nip portion, a first external heater including a first heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member that has passed the nip portion, and a second external heater including a second heat generation member and configured to contact an outer surface of the image heating rotational member and heat an area of the image heating rotational member heated by the first external heater. In the image heating apparatus, maximum power applied to the second heat generation member is smaller than maximum power applied to the first heat generation member. | 12-03-2009 |
20090310999 | SHEET POST-PROCESSING APPARATUS, IMAGE FORMING SYSTEM AND POWER SAVING CONTROL METHOD - A sheet post-processing apparatus has a sheet conveying portion which receives and conveys a sheet discharged from an apparatus on an upstream side, and discharges it to an apparatus on a downstream side or a discharge tray, a sheet post-processing portion which carried out post-processing on the sheet, and a power saving control portion which renders the sheet post-processing apparatus into a power saving state, and the power saving control portion maintains electric power supply to the sheet conveying portion, and interrupts electric power supply to the sheet post-processing portion. The sheet post-processing apparatus, even in the power saving state, is capable of discharging the sheet discharged from the apparatus on the upstream side to the apparatus on the downstream side or a discharge tray. | 12-17-2009 |
20100008692 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus including a power supply unit which supplies high voltage AC power, a developing unit having at least one developing roller to receive first AC power from the power supply unit to supply a developer to an image receptor, and an erasing unit to receive second AC power to attenuate high frequency noise of the developing unit. | 01-14-2010 |
20100034552 | IMAGE FORMING DEVICE - There is provided an image forming device, comprising: a first electrical load; a second electrical load; a voltage generation circuit that generates a second voltage to be applied to the second electrical load; a shunt circuit that located between an output side of the voltage generation circuit and the first electrical load; and a controller that executes first control of controlling the shunt circuit to change a first voltage applied from the shunt circuit to the first electrical load to a first target level, and second control of controlling the voltage generation circuit to change the second voltage to a second target level. The controller executes voltage change suppression control of controlling the second voltage such that change of the second voltage becomes gentler as a difference between the first voltage and the first target level becomes larger. | 02-11-2010 |
20100046978 | IMAGE FORMING APPARATUS AND POWER CONTROL METHOD THEREFOR - An image forming capable of operating with reliability and shortening the down time. An operation unit forms an image. A power source unit supplies electric power supplied from an external power source to the operation unit. A storing unit stores successful data which shows that the image forming apparatus has started successfully. A mode selection unit selects a first mode in which regular electric power is supplied to the operation unit at a start-up when the storing unit stores the successful data, and a second mode in which electric power smaller than the regular electric power is supplied to the operation unit at the start-up when the storing unit does not store the successful data. A power control unit controls the electric power supplied from the power source unit to the operation unit according to the mode selected by the mode selection unit. | 02-25-2010 |
20100054790 | POWER SUPPLY UNIT AND IMAGE FORMING DEVICE HAVING THE SAME - There is provided a power supply unit, comprising: a converter transformer; a first low voltage generation unit to generate a first voltage on a secondary side of the converter transformer and output the first voltage; a first controller that controls an activation state of a primary side of the converter transformer based on the first voltage; an inactivation unit to inactivate operation of the first controller based on the first voltage to let the first low voltage generation unit to suspend output of the first voltage; a high voltage supply unit to output a high voltage higher than the first voltage by using the first voltage; a detection unit to detect an anomalous state concerning output of the high voltage of the high voltage supply unit. The high voltage supply unit inactivates the operation of the first controller through the inactivation unit when the anomalous state is detected. | 03-04-2010 |
20100080604 | IMAGE FORMING APPARATUS TO CONTROL NOISE AND METHOD THEREOF - Provided is an image forming apparatus and a method of controlling the same. When an external power is supplied to a heating resistance member of a fusing unit in the image forming apparatus that is in a standby mode, a power supply unit supplies an internal power to a different load (for example, an exposure unit, a developing unit, or a transfer unit) in one or more time sections so as to supply the internal power to the load at a continuously changing operating frequency. | 04-01-2010 |
20100086325 | Architecture for an Image-Forming Device - An image forming device includes a body having a top, a bottom, a front and a back. In one embodiment, a plurality of horizontally-aligned imaging units, each comprising a photoconductive member, transfer toner images to an intermediate transfer mechanism located below the plurality of imaging units. A pick mechanism may pick media sheets from a media input tray and feeds the media towards the front of the body. For duplex printing, the media sheets may travel along a duplex path that extends along the front of the body. In one embodiment, an access door at the front of the body pivots between a closed position and an open position. In the open position, a user may gain access to both media paths. | 04-08-2010 |
20100104312 | POWER FEEDING MECHANISM AND IMAGE FORMING APPARATUS - A power feeding mechanism includes: a power-fed body placed in an apparatus main body, the power-fed body into which power is fed at least when the power-fed body is used; a placement portion where the power-fed body provided in the apparatus main body is placed; a power feed member provided in the apparatus main body and configured to move between a noncontact position and a contact position, the power feed member at the contact position that feeds power into the power-fed body from the apparatus main body; and a move unit that moves the power feed member to at least the two positions. At the noncontact position, the power feed member is noncontact in electric with the power-fed body being placed in the placement portion. At the contact position, the power feed member is contact in electric with the power-fed body being placed in the placement portion. | 04-29-2010 |
20100104313 | POWER SOURCE DEVICE AND IMAGE FORMING APPARATUS - A power source device includes an oscillator generating a clock, a frequency division unit dividing the clock to output a pulse, a sequence generation unit generating sequences “N” with respect to each switching of the pulse, a frequency division ratio setting unit setting frequency division ratio, a switching element driven by the pulse, and a piezoelectric transformer outputting alternating high voltage from a secondary-side when a primary-side is applied with voltage. The generated sequence and the set frequency division ratio are compared to output the pulses of fractional-M, −M+1 frequencies. An average frequency division ratio of the pulses of fractional-M, −M+1 frequencies determined by (M×α)+(M+1)×β/(α+β), where α and β respectively represent the number of pulses of “M” and “M+1” per unit time. The average frequency division ratio and frequency division ratio become equal at a sequence generation cycle and approximated in a period shorter than the sequence generation cycle. | 04-29-2010 |
20100150600 | IMAGE PROCESSING APPARATUS AND METHOD OF CONTROLLING THE SAME - An image processing apparatus includes a living body detection unit configured to detect approaching of a living body based on a detection output depending on a distance to the living body, an operation unit configured to receive an operation command from a user, a history recording unit configured to record a history of a detection output of the living body detection unit and a history of an operation performed on the operation unit, and a determination unit configured to determine a threshold value of the detection output, the threshold value being used by the living body detection unit as a determination reference value in determining whether a living body is detected, the determination of the threshold value being made based on the history recorded in the history recording unit as to the detection output of the living body detection unit and as to the operation performed on the operation unit. | 06-17-2010 |
20100166447 | POWER CONTROL FOR A PRINTER FUSER - A system for delivering desired magnitudes of AC power to a load. A three-cycle power mode includes a 1 | 07-01-2010 |
20100166448 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus includes an image forming unit configured to form an image on recording paper, a first control unit configured to control the image forming unit, a second control unit configured to control the image forming unit, and a power supplying unit configured to supply power, when the image forming apparatus is to operate in a normal power mode, such that the first control unit goes into a normal power state in which the first control unit can control the image forming unit, and supply power, when the image forming apparatus is to operate in a power saving mode, such that the first control unit goes into a power saving state in which the first control unit cannot control the image forming unit and the second control unit goes into a state in which the second control unit can control the image forming unit, wherein the second control unit controls the power supplying unit to supply power to the image forming unit and controls the image forming unit to perform a specific operation at predetermined timing when the image forming apparatus operates in the power saving mode. | 07-01-2010 |
20100166449 | Power supply device and method for image forming apparatus - Provided is a power supply device for an image forming apparatus, the power supply device including: a filter unit filtering alternating current (AC) power from an AC power source; and a converter generating a direct current (DC) power from the filtered AC power, wherein the filter unit includes: a capacitor connected to the AC power source; a discharge device connected to the capacitor and discharging electric charges accumulated in the capacitor; and a switching device switching connection between the capacitor and the discharge device according to a power supply mode of the power supply device. | 07-01-2010 |
20100196043 | Power Supply Circuit Identification Device for Identifying a Type of a Power Supply Circuit and Image Forming Apparatus - A power supply circuit identification device for identifying a type of a power supply circuit, the power supply circuit having an input terminal to which a control signal for controlling electrical power supplied to an electrical load is input and an output terminal from which a detection signal that indicates whether the electrical power corresponding to the control signal is supplied to the electrical load is output, at least one of the input terminal and output terminal being plurally provided and having a type-dependent correlation between the input and output terminals. The identification device includes: a control section configured to input the control signal to the power supply circuit via the input terminal; a reading section configured to read the detection signal from the output terminal; and an identification section configured to identify a type of the power supply circuit based on a reading result from the reading section. | 08-05-2010 |
20100202794 | POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS - A power supply device includes: an oscillator configured to output a clock signal; a pulse output unit configured to output a pulse by dividing the frequency of the clock signal; a switching element driven by the pulse; a piezoelectric transformer configured to intermittently receive a voltage from the switching element and to output a high alternating current voltage; a rectifier configured to convert the high alternating current voltage to a high direct current voltage; an output voltage conversion unit configured to convert the high direct current voltage to a low direct current voltage; a target setter configured to output a target value; and a comparison unit configured to compare the low direct current voltage with the target value and to output a comparison result. A frequency division ratio of the pulse is controlled according to the comparison result, and thereby is changed so as to obtain the target value. | 08-12-2010 |
20100209132 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS - The power supply apparatus includes a plurality of voltage rising circuits each of which can be driven at a different duty ratio so as to convert and output a voltage output from a direct current power source according to a plurality of loads; and a control circuit which controls an input voltage from the direct current power source to each voltage rising circuit according to drive condition of the voltage rising circuit having the highest duty ratio of the plurality of voltage rising circuits. This configuration can provide a highly productive power supply apparatus capable of reducing a ripple voltage. | 08-19-2010 |
20100215393 | IMAGE FORMING APPARATUS - An image forming apparatus includes plural image holders that hold an image; plural development devices that produce an image on the plural image holders; an intermediate transfer body supported by plural support members; plural first transfer devices that transfer images that are present on the plural image holders to the intermediate transfer body; a second transfer device that transfers a composite image from the intermediate transfer body onto a recording medium; a fixing device that fixes the composite image onto the recording medium; an ejection device that ejects the recording medium having the composite image transferred thereto out of the image forming apparatus main body; and a recording medium stacking part where ejected recording media are stacked. | 08-26-2010 |
20100239303 | CONVERTER, SWITCHING POWER SUPPLY, AND IMAGE FORMING APPARATUS - A converter includes a switching element configured to switch an input voltage, a drive unit configured to drive the switching element, a pulse signal generating unit configured to supply a pulse signal to the drive unit, and a bypass unit configured to connect the switching element and the pulse signal generating unit without involving the drive unit. An operation of the bypass unit maintains the switching element in an on state when the input voltage is switched to a lower voltage and switching of the input voltage is stopped. | 09-23-2010 |
20100247134 | Developer Supply Device - A developer supply device, comprising: a casing; first electrodes located at a first most downstream position defining a certain distance with respect to the supply target and positions between the casing and the first most downstream position to form a first traveling electric field; a second electrodes that are located at a second most downstream position defining the certain distance with respect to the supply target and positions between the casing and the second most downstream position to form a second traveling electric field; a power circuit that supplies a first voltage and a second voltage having a same frequency respectively to the first electrodes and the second electrodes such that a phase of voltage change of a first most downstream electrode and a phase of voltage change of a second most downstream electrode shift with respect to each other. | 09-30-2010 |
20100272463 | IMAGE FORMING APPARATUS AND HIGH VOLTAGE GENERATING POWER SUPPLY - An image forming apparatus includes, an image forming unit, an irradiating unit, a first low voltage power supply which generates a first low voltage, a first low voltage power supply line, a first switching element, a first high voltage generating unit including a first transformer, a second low voltage power supply, and a control unit. The image forming apparatus further includes an cover which can be opened and closed, wherein the image forming unit detects the opening and closing of the cover; and an interlock switch which interlocks with the opening/closing of the cover and includes a first contact point connected to the first low voltage power supply and a second contact point connected to the first low voltage power supply line, wherein the interlock switch is opened to disconnect the first contact point from the second contact point when the cover is opened. | 10-28-2010 |
20100329725 | POWER SUPPLY CONTROL METHOD AND APPARATUS - This disclosure provides power supply control methods and apparatus. According to one aspect of the disclosure, a method of operating a power supply operatively connected to a developer unit associated with a printing apparatus is disclosed. The method includes generating a modified output control signal as a function of stored gain and offset values associated with the power supply to generate a desired output voltage to drive the developer unit. | 12-30-2010 |
20110020028 | IMAGE FORMING APPARATUS AND VOLTAGE GENERATION CIRCUIT - An image forming apparatus includes a developing device configured to perform development and a voltage generation circuit configured to apply a developing bias voltage to the developing device. Here, the voltage generation circuit includes a transformer configured to generate an alternating voltage to be applied as the developing bias voltage on a secondary winding; a capacitor that is connected to a first end of a primary winding of the transformer; a first voltage generating unit that is connected to a second end of the primary winding and is configured to generate a first voltage; a second voltage generating unit that is connected to the first end via the capacitor and is configured to generate a second voltage; and a controller configured to perform control so as to store an electric charge in the capacitor with the first voltage and the second voltage before the alternating voltage is generated. | 01-27-2011 |
20110052243 | POWER OFF SEQUENCE OF IMAGE FORMING APPARATUS - A first power source unit supplies power to a first control unit accessing a storage unit. An image forming unit controlled by a second control unit is provided with a load for forming an image. A second power source unit supplies power to the load and the storage unit. A switch unit is operated to power on or off an image forming apparatus. The first control unit, upon receiving the status signal instructing power-off, causes the storage unit to shut down and transmits an instruction to cause the load to shut down to the second control unit. The second control unit, if a shutdown instruction is not received even when the status signal instructing power-off has been detected, performs control to stop the load and then stop the supply of power from the second power source unit. | 03-03-2011 |
20110058841 | HIGH VOLTAGE POWER SUPPLY AND METHOD OF OUTPUTTING PLUS/MINUS HIGH-VOLTAGE IN IMAGE FORMING APPARATUSES - A high-voltage power supply to output a plus/minus high-voltage, which is applied to image forming apparatuses, includes a plus high-voltage output unit outputting the plus high-voltage by using a Pulse Width Modulation (PWM) signal, a minus high-voltage operation control unit charging a certain voltage while the plus high-voltage output unit is outputting the plus high-voltage, a minus high-voltage output unit outputting the minus high-voltage by using the certain voltage charged in the minus high-voltage operation control unit, and a minus high-voltage blocking unit to block the output of the minus high-voltage from the minus high-voltage output unit while the plus high-voltage output unit is outputting the plus high-voltage. | 03-10-2011 |
20110058842 | HIGH-VOLTAGE POWER SUPPLY OF IMAGE FORMING APPARATUS - A high-voltage power supply usable in an image forming apparatus includes a power transformation unit that generates an alternate-current (AC) voltage by transforming a voltage applied to the high-voltage power supply and a plurality of rectification units that are connected to the power transformation unit in order to rectify the AC voltage into different DC voltages, respectively. | 03-10-2011 |
20110064445 | POWER SOURCE UNIT AND IMAGE FORMING APPARATUS - A power source unit includes an AC/DC converter to convert alternating current to direct current output, an auxiliary power source storing electric power, a load detector to detect a high/low level of direct current output to a DC-using load device from the AC/DC converter, and a power supply controller. When load to be required exceeds alternating current power source limits, the power supply controller shuts down output of direct current from the AC/DC converter, and instead uses the auxiliary power source to supply power to the DC-using load device. When the load to be required is within alternating current power source limits, the power supply controller uses the AC/DC converter to supply power to the DC-using load device while the load detector detects high voltage for the DC-using load device, and the power supply controller uses the auxiliary power source to supply power to the DC-using load device and shuts down the AC/DC converter while the load detector detects low voltage for the DC-using load device. | 03-17-2011 |
20110076046 | Image forming apparatus - An image forming apparatus detects whether a cover is opened or closed in each of a general power mode and a power saving mode. The image forming apparatus includes a cover opening/closing sensor to detect opening or closing of a cover, a cover opening/closing sensing power-supply input unit to provide or not to provide a voltage different from an operation voltage of the image forming apparatus, to the cover opening/closing sensor according to the opening or closing of the cover, and an interlock switch to connect or not to connect the cover opening/closing sensor to the cover opening/closing sensing power-supply unit according to the opening or closing of the cover. | 03-31-2011 |
20110076047 | Image Forming Apparatus - An image forming apparatus includes a placement tray, an image forming unit, a drive unit, a control board, a power supply substrate, a high-voltage board, and low-voltage power supply harnesses. The placement tray holds a recording sheet thereon. The image forming unit forms an image on the recording sheet. The drive unit supplies driving force to the image forming unit. The control board controls the drive unit. The power supply substrate supplies electric power to the control board. The high-voltage board is disposed in one side of the placement tray. In the high-voltage board, voltage is generated higher than voltage in the power supply substrate. The low-voltage power supply harnesses are disposed in another side of the placement tray so as to supply electric power from the power supply substrate to the control board. | 03-31-2011 |
20110081160 | IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING POWER THEREOF - An image forming apparatus includes a power supply unit to generate DC power, a plurality of function units to perform the functions of the image forming apparatus, a control unit to control the operation of a plurality of function units, a switching unit to receive DC power of the power supply unit and switch power provided to the control unit and each of a plurality of function units, and a power management unit to receive DC power of the power supply unit and to control a switching operation of the switching unit according to an operation mode of the image forming apparatus. | 04-07-2011 |
20110085816 | Electric power relaying unit and image forming apparatus having the same - An electric power relaying unit of an image forming apparatus which includes an electric power blocking unit which selectively blocks the alternating current electric power output from the electric power input unit to be input to the electric power output unit, the electric power blocking unit including: a switching unit which switches an input of the alternating current electric power with respect to the electric power output unit; an electric power detecting unit which detects an electric power property; a memory unit in which a predetermined electric power property information is stored; and a control unit which controls a switching operation of the switching unit if determining that the detected electric power property corresponds to a predetermined electric power property in a failure of the image forming apparatus main body from a comparison result. | 04-14-2011 |
20110085817 | POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME - A power supply includes a transformer to transform an input voltage into an output driving voltage for one of a plurality of components of an image forming apparatus, and an output converter to detect the driving voltage being output from the transformer, to amplify the detected driving voltage according to a power control signal, and to output the amplified driving voltage to at least one remaining component in the plurality of components of the image forming apparatus. The power supply can not only control high voltage outputs individually, but also reduces the number of switching transformers being used, as it uses at least one shared switching transformer. | 04-14-2011 |
20110097100 | TECHNOLOGY FOR REDUCING CIRCUIT OSCILLATIONS AND RIPPLE IN A HIGH-VOLTAGE POWER SUPPLY USING A PIEZOELECTRIC TRANSFORMER - A high-voltage power supply comprises the following components. A piezoelectric transformer outputs a voltage in accordance with a supplied drive frequency. A rectification part is connected to an output side of the piezoelectric transformer. A drive frequency generating part generates the drive frequency supplied to the piezoelectric transformer. A voltage detection part detects an output voltage of the piezoelectric transformer or the rectification part. A control part controls the drive frequency generating part such that a drive frequency corresponding to the output voltage detected by the voltage detecting part is generated. A first time constant, which is a time constant of the control part, is smaller than a second time constant, which is a time constant of a control target including the piezoelectric transformer and the rectification part. A third time constant, which is a time constant of the voltage detecting part, is smaller than the second time constant. | 04-28-2011 |
20110116823 | POWER SUPPLY DEVICE, HEATING UNIT USING SAME, AND IMAGE FORMING APPARATUS USING SAID HEATING UNIT - The invention reduces loss produced when a power supply device supplies power to a fixing unit of a copier, thereby contributing to a reduction in size, a saving in terms of energy and lower cost. To achieve this, it is arranged so that it is possible to vary the capacitance of a resonant capacitor C | 05-19-2011 |
20110135338 | POWER SUPPLY UNIT, IMAGE FORMING APPARATUS AND POWER SUPPLY CONTROL METHOD - A power supply unit includes a switching circuit that drives a switching device by a duty ratio corresponding to a target voltage output value and outputs an alternating current signal; a coupling capacitance element provided in a subsequent stage with respect to the switching circuit; a voltage transformation unit that increases a voltage of the alternating current signal input by using the switching circuit, and outputs a high-voltage alternating current voltage to an electrifying unit; a charging unit that charges the coupling capacitance element in response to a power supply voltage being turned on; and a control unit that controls driving of the switching device to cause the coupling capacitance element to be charged to a predetermined charged amount before the switching circuit starts outputting the alternating current signal. | 06-09-2011 |
20110135339 | APPARATUS AND METHOD FOR CONTROLLING POWER OF LASER DIODE HAVING OPTICAL POWER COMPENSATION - An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period. | 06-09-2011 |
20110142477 | Image forming apparatus - An image forming apparatus includes a power supply supplying a plurality of developing devices with a first voltage to develop toners on an image carrier, and a voltage divider supplying some of the developing devices not connected to the power supply with the first voltage or a second voltage. | 06-16-2011 |
20110142478 | HIGH VOLTAGE POWER SUPPLYING APPARATUS AND IMAGE FORMING APPARATUS HAVING THE SAME - In a high voltage power supplying apparatus, a pulse generation unit generates a pulse signal with a predetermined frequency. A piezoelectric transformer outputs a voltage in accordance with the frequency of the pulse signal. A detection unit detects an output voltage of the piezoelectric transformer. A control unit controls the pulse generation unit to change the frequency of the pulse signal by a predetermined value towards a frequency corresponding to a target voltage until the output voltage becomes equal to the target voltage. A storage unit stores data indicating the frequency when the output voltage reaches the target voltage. The control unit controls the output voltage to be equal to the target voltage by variably controlling the frequency of the pulse signal by a value smaller than the predetermined frequency from the frequency corresponding to the data stored in the storage unit. | 06-16-2011 |
20110142479 | IMAGE FORMING APPARATUS - An image forming apparatus includes a first power source configured to supply power for driving a load to be used for image formation via a first power line, a load control circuit configured to control driving of the load, a control circuit configured to output control data for the load control circuit to control the load, a second power source configured to supply power for the load control circuit via a second power line provided separately from the first power line, a superimposing circuit configured to superimpose the control data output from the control circuit onto the second power line, and a separation circuit configured to separate the control data from the second power line, on which the control data is superimposed and sent, and to output the control data to the load control circuit. | 06-16-2011 |
20110150521 | POWER SUPPLY AND IMAGE FORMING APPARATUS - A synchronous rectification power supply controls driving of a switching unit in such a manner as to start the driving in response to rising of an output voltage at a secondary side of a transformer and to stop the driving after a predetermined time passed. | 06-23-2011 |
20110150522 | POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS - A power supply device controls drive of a synchronous rectification switch unit by converting a voltage into a current, and comparing a voltage obtained by current-to-voltage conversion with a predetermined value. | 06-23-2011 |
20110150523 | POWER SUPPLY AND IMAGE FORMING APPARATUS - A power supply includes a transformer, a switching unit configured to drive the transformer at a primary side of the transformer, a voltage adjustment unit configured to adjust voltage of a capacitive element at a secondary side of the transformer, at the primary side thereof, and a plurality of constant voltage members connected across the terminals of the capacitive element at the secondary side of the transformer, wherein the power supply generates voltage having a predetermined polarity during the period before the voltage of the capacitive element at the secondary side of the transformer becomes a predetermined voltage by the voltage adjustment unit, and generates voltage having a polarity opposite to the predetermined polarity after the voltage of the capacitive element at the secondary side becomes the predetermined voltage. | 06-23-2011 |
20110158674 | Multiple-Output Power Supply Unit and Image Forming Apparatus Having the Power Supply Unit - A multiple-output power supply unit includes: a transformer including: a primary winding; and a secondary winding which has a first node and a second node and which generates a secondary-side voltage at the secondary winding; first output terminal to output a first voltage corresponding to the secondary-side voltage; a first constant voltage element; a current limiting resistor; a second constant voltage element; a second output terminal to output a second voltage different from the first voltage; a current generation circuit provided between the first node and the ground so as to cause a predetermined current to flow between the first node and the ground; a transformer driver circuit connected to the primary winding so as to drive the transformer; and a secondary-side voltage control circuit that controls the transformer driver circuit so as to generate the secondary-side voltage having a predetermined value at the first node. | 06-30-2011 |
20110158675 | Multiple-Output Power Supply Unit and Image Forming Apparatus Having the Power Supply Unit - A multiple-output power supply unit includes: a first voltage generation circuit that generates a first voltage applied to a first load; a first output terminal that outputs a second voltage corresponding to the first voltage to a second load; a first constant voltage element that is connected to the first output terminal; a second constant voltage element that is provided between the first constant voltage element and a ground; and a second output terminal that is connected between the first constant voltage element and the second constant voltage element so as to output a third voltage having a predetermined potential difference from the second voltage to a third load that is provided in a state of being electrically connected to the second load. | 06-30-2011 |
20110164895 | IMAGE FORMING APPARATUS - An image forming apparatus that has a monochrome mode and a full color mode as image forming modes, includes: a power supply unit configured to supply power thereto; a main power switch configured to turn on and off the power supply unit; a mode switching unit configured to selectively and manually be switched between the monochrome mode and the full color mode, wherein the main power switch and the mode switching unit are integrally formed as one mode switch; a power supply interrupting unit configured to interrupt power supply to a part that is necessary to form an image in a mode other than the monochrome mode, when the mode switch is set to the monochrome mode. | 07-07-2011 |
20110170894 | High voltage power supply - A high voltage power supply (HVPS) including first and second high voltage output controllers controlling output of a high voltage output signal; and a plurality of transformers transforming an output signal provided from the first and second high voltage output controller, disposed outside of the first and second high voltage controllers on the substrate, wherein output terminals in the secondary sides of the plurality of transformers are disposed along the edge of the substrate. Therefore, the volume of a system can be minimized by arranging circuits in each component for high voltage output in parallel, and spark and discharge can be reduced by minimizing interference between the primary sides and the secondary sides of the components for high voltage output, thereby preventing damage to a product. | 07-14-2011 |
20110176827 | POWER SUPPLY APPARATUS, ELECTRICAL EQUIPMENT, AND IMAGE FORMING APPARATUS - A power supply apparatus includes a first electric power-generating unit that generates an electric power with a first voltage, a second electric power-generating unit that generates an electric power with a second voltage that is higher than the first voltage, and an overcurrent monitoring circuit to which electric powers for operation are supplied from the first electric power-generating unit and the second electric power-generating unit and that monitors overcurrent in the second electric power-generating unit. | 07-21-2011 |
20110188878 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS - A power supply apparatus needs to control an output voltage to a target voltage for a short time. A power supply apparatus of the present invention detects voltages output from a piezoelectric transformer. The power supply apparatus also detects peak values in a plurality of detected voltages according to a plurality of frequencies of pulse signals for the piezoelectric transformer, and identifies a frequency corresponding to the highest peak value, and a frequency corresponding to a next peak value next to and on a higher- or lower-frequency side of the frequency corresponding to the highest peak value. Moreover, the power supply apparatus sets an initial frequency used when starting to control the output voltage of the piezoelectric transformer to the target voltage, within a frequency range between the two identified frequencies. | 08-04-2011 |
20110194871 | SWITCHING POWER SUPPLY DEVICE USING SWITCHING REGULATOR - A power supply device includes, for example, a switching element, a rectifying circuit having a first rectifying element, and a control circuit which controls an output of the rectifying circuit. In particular, the power supply device includes a detection unit which detects a current flowing through the first rectifying element, and an output reduction unit which reduces the output of the rectifying circuit as an output of the switching power supply device. The output reduction unit changes a switching state of the switching element when the detection result of the detection unit exceeds a predetermined value. | 08-11-2011 |
20110206404 | IMAGE FORMING APPARATUS WITH FUSER UNIT - An image forming apparatus includes a fuser unit configured to make an image fused to a recording medium, a selecting unit configured to select a duplex scanning mode or a single-side scanning mode, a check unit configured to determine which one of the duplex scanning mode and the single-side scanning mode is selected, a duplex scanning unit configured to perform a scan when both sides of a document sheet are scanned upon the duplex scanning mode being selected, a setting unit configured to determine power supplied to the fuser unit upon determining, by the check unit, that the single-side scanning mode is selected, and a supply unit configured to supply the determined power to the fuser unit, wherein the determined power is equal to a sum of power consumed by the duplex scanning unit and power that is consumed by the fuser unit upon the duplex scanning mode being selected. | 08-25-2011 |
20110211858 | VOLTAGE SUPPLYING UNIT OF DEVELOPING DEVICE AND IMAGE FORMING APPARATUS HAVING THE SAME, AND A METHOD THEREOF - An image forming apparatus includes a plurality of developing devices, a voltage generating part to generate a developing voltage, first switching parts to supply the voltage generated in the voltage generating part to a predetermined developing device out of the plurality of developing devices, a second switching part to selectively supply the developing voltage generated in the voltage generating part to the first switching parts, and a controller to control the first switching parts and the second switching part. | 09-01-2011 |
20110222894 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device for fixing a toner image onto a recording sheet, the fixing device comprising: a fixing belt including, on an inner circumference side thereof, a resistance heating layer, extending over entire circumference of the fixing belt, operable to emit heat upon flowing of an electric current therethrough; a pressing member operable to press an outer circumference of the fixing belt to form a fixing nip therebetween so that, while the recording sheet passes through the fixing nip, the toner image is fixed onto the recording sheet; and a pair of power supply members arranged inside the fixing belt along the circumferential direction with a predetermined distance therebetween, the power supply members being in contact with the inner circumferential surface of the resistance heating layer in an electrically conductive state along a direction perpendicular to the circumferential direction. | 09-15-2011 |
20110222895 | IMAGE FORMATION APPARATUS, IMAGE FORMATION SYSTEM, AND OUTPUT CONTROL METHOD - An image formation apparatus is connectable to a post processing apparatus for performing a post process to a sheet. The image formation apparatus includes: a power source for outputting a voltage to a first load and a second load, the first load being provided in the image formation apparatus and being involved in image formation, the second load being provided in the post processing apparatus and being involved in the post process; a power source controller for increasing the output voltage of the power source during an operation of the second load; and a load controller for controlling an operation of the first load such that an output of the first load falls within a predetermined range during the operation of the second load. | 09-15-2011 |
20110222896 | SERIAL COMMUNICATION APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME - An image forming apparatus includes a photosensitive member, an exposure unit configured to expose the photosensitive member corresponding to an image, a developing unit configured to develop, using a toner, an electrostatic latent image formed on the exposed photosensitive member, a generation unit configured to generate a waveform signal for the developing unit, a parallel-to-serial conversion unit configured to apply, at a predetermined sampling period, parallel-to-serial conversion to a plurality of signals including the generated waveform signal, a serial-to-parallel conversion unit configured to apply, at the predetermined sampling period, serial-to-parallel conversion to the signals output from the parallel-to-serial conversion unit, and a voltage applying unit configured to apply to the developing unit a voltage composed of a direct-current voltage and an alternating-current voltage superimposed thereon based on the waveform signal among signals output from the serial-to-parallel conversion unit. | 09-15-2011 |
20110274456 | IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING IMAGE FORMING APPARATUS - An image forming apparatus includes a fixing device having a heater, a signal generator for generating a prescribed cyclic signal in conformity with a waveform of an AC power supply applied to the heater, and a controller for controlling power feed to the heater. The controller determines whether a cycle of the prescribed cyclic signal becomes shorter than a prescribed period or not. When the controller has determined that the cycle has become shorter than the prescribed period, the controller controls power feed to the heater under phase control and when the controller has determined that the cycle has not become shorter than the prescribed period, the controller controls power feed to the heater under zero crossing control. | 11-10-2011 |
20110280608 | Power switch structure and image forming apparatus including same - A power switch structure for an apparatus, including a recess provided in a side surface of the apparatus and having a distal sloped face facing a front side of the apparatus and a proximal sloped face surface, and a power switch, inclined with respect to the side surface of the apparatus, positioned on the distal sloped face surface to face the front side of the apparatus. | 11-17-2011 |
20110293311 | PIEZOELECTRIC TRANSFORMER TYPE HIGH-VOLTAGE POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS - A high-voltage power supply device comprises: a piezoelectric transformer; a driving unit of the piezoelectric transformer; a detection unit configured to detect the output of the piezoelectric transformer; and a control unit configured to control the output of the piezoelectric transformer by giving a driving signal to the driving unit so that the output detected by the detection unit reaches a target value, wherein the control unit changes a frequency of the driving signal without changing a duty of the driving signal so as to set the frequency of the driving signal such that the output falls within a predetermined range including the target value, and after setting the frequency for the output within the predetermined range, changes the duty of the driving signal so that the output reaches the target value. | 12-01-2011 |
20110293312 | IMAGE FORMING APPARATUS - An image foaming apparatus includes an image bearing member, a transfer unit, and a pressing mechanism. The image bearing member bears a toner image. The transfer unit is disposed opposite the image bearing member and is swingably and detachably held within a main body of the image forming apparatus. The transfer unit includes a transfer member and a power receiving electrode. The transfer member is disposed opposite the image bearing member, to contact the image bearing member to form a transfer nip therebetween and transfer the toner image on the image bearing member onto a recording medium in the transfer nip. The power receiving electrode receives power from the main body of the image forming apparatus. The pressing mechanism presses the transfer unit against the image bearing member and includes a power supply electrode that contacts the power receiving electrode of the transfer unit to supply power thereto. | 12-01-2011 |
20110293313 | CURRENT RESONANCE POWER SUPPLY - A current resonance power supply includes a transformer having a primary winding and a secondary winding, two switching elements connected to one end of the primary winding of the transformer and arranged in series, a resonance capacitor connected to the other end of the primary winding, and a voltage detection unit connected between the one end of the primary winding and the two switching elements and configured to detect that AC voltage input to a primary side of the transformer becomes lower, wherein operations of the switching elements are controlled based on a detection result of the voltage detection unit. | 12-01-2011 |
20110293314 | POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS - The image forming apparatus includes an image bearing member, a transfer member, a power supply unit including a first voltage generation circuit and a control unit that controls the power supply unit, wherein in the case where a voltage whose magnitude cannot be output by the first voltage generation circuit is output from the power supply unit to the transfer member in spite of driving the first piezoelectric transformer at the drive frequency in the first drive frequency area, the control unit controls the power supply unit to output the voltage to the transfer member by superposing a voltage output from the first voltage generation circuit by driving the first piezoelectric transformer at a frequency in the first drive frequency area with a voltage output from the second voltage generation circuit by driving the second piezoelectric transformer at a frequency in the second drive frequency area. | 12-01-2011 |
20110299871 | IMAGE FORMING DEVICE INCLUDING SHEET-METAL HOUSING - An image forming device includes: a processing unit that performs an image forming process on a sheet; a housing that defines a housing space in which the processing unit is housed; a high-voltage board that generates a high voltage to be supplied to the processing unit; a wire that electrically connects the high-voltage board and the processing unit with each other; and a wire holding plate that holds the wire. The housing includes a pair of a first sheet-metal frame and a second sheet-metal frame which oppose each other and a sheet-metal coupling piece which couples these sheet-metal frames, and the first sheet-metal frame and the second sheet-metal frame support the processing unit between the first sheet-metal frame and the second sheet-metal frame. The wire holding plate extends over substantially the entire dimension of the coupling piece in an extending direction thereof and is fixed to the coupling piece. | 12-08-2011 |
20110311259 | SWITCHING POWER SOURCE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - In a switching power source, an OFF-period of switching is set according to a resonance cycle when a transformer is driven. | 12-22-2011 |
20110311260 | SWITCHING POWER SOURCE AND IMAGE FORMING APPARATUS HAVING THE SAME - A switching power source is provided, which includes, a transformer, a switching unit configured to switch a voltage supplied to a primary side of the transformer, and an output unit configured to output a voltage generated at a secondary side of the transformer, wherein a switching cycle of the switching unit is set to be a predetermined period of time when the output unit outputs a first voltage, a first period of time and a second period of time are set to be longer than the predetermined period of time and are set to be different from each other. | 12-22-2011 |
20110318044 | INFORMATION PROCESSING APPARATUS, INFORMATION PROCESSING METHOD, AND STORAGE MEDIUM - One aspect of the present invention provides an information processing apparatus comprising: an acquisition unit configured to acquire the print request from the client; a selection unit configured to select the first printing apparatus when the accumulated power consumption is not more than a first threshold, and selects the second printing apparatus when the accumulated power consumption is higher than the first threshold; and an accumulation unit configured to add a power to be consumed by the printing apparatus selected by the selection unit to process the print request to the accumulated power consumption stored in the storage unit. | 12-29-2011 |
20120002995 | SWITCHING MODE POWER SUPPLY AND METHOD OF SUPPLYING POWER BY USING THE SAME - The present general inventive concept describes a switching mode power supply (SMPS) and a method of supplying power by using the same. An SMPS that may be used in an image forming apparatus can include a transformation unit to transform an alternating-current (AC) voltage input to the SMPS, into at least one direct-current (DC) voltage by using a transformer, a first output voltage output unit to output the transformed DC voltage as a first output voltage of the SMPS, a first switching unit to prevent output of the second output voltage, and a second switching unit to prevent output of the second output voltage. | 01-05-2012 |
20120002996 | TRANSFER DEVICE AND IMAGE FORMING APPARATUS - A transfer device includes a transfer belt, a transfer roller and a tension roller over which the transfer belt is passed in a tensioned condition and which is made to be in an electrically floated state; it also includes a guide member that is installed in the vicinity of the tension roller. A control section, in transfer processing, controls a first switch so that the guide member is in a grounded state while controlling a second switch so that an electric current being caused to flow to the transfer roller becomes a first electric current; and in cleaning processing, controls the first switch so that the guide member is in an electrically floated state while controlling the second switch so that an electric current being caused to flow to the transfer roller becomes a second electric current. | 01-05-2012 |
20120020695 | FUSER SYSTEM AND HEAT SOURCE POWER CIRCUIT - A printing system fuser is presented with an AC-AC power circuit using a pair of high speed pulse width modulated switches and low speed switching devices for flyback current conduction for powering a fuser heating element, and power factor control system and techniques are presented for adapting AC-AC converter control for powering one fuser heating element at least partially according to angle control switching of another fuser heating element to control fuser power factor. | 01-26-2012 |
20120027447 | HIGH-VOLTAGE GENERATION APPARATUS AND IMAGE FORMING APPARATUS - A high-voltage generation apparatus raises, in a transient-state period elapsed since output of a voltage is started until the voltage reaches a target value, the output voltage by a change amount corresponding to the target value without performing feedback control. | 02-02-2012 |
20120027448 | HIGH-VOLTAGE GENERATION APPARATUS - A high-voltage generation apparatus raises, when switching from a state where a voltage having a predetermined polarity is output to a state where a voltage having a polarity opposite to the predetermined polarity is output, the voltage having the predetermined polarity in change amounts corresponding to the voltage having the predetermined polarity and a target voltage having the opposite polarity in a transient-state period elapsed until the voltage reaches the target voltage. | 02-02-2012 |
20120057894 | DEVICE AND METHOD FOR LIMITING AMPERAGE DRAW OF PRINTING DEVICE - A method and printing apparatus include a plurality of components and a controller operatively connected to the components. Further, a power supply is also operatively connected to the components. The controller selectively limits the operations of selected ones of the components to prevent all the components of the printing apparatus from collectively drawing from the power supply an amount of power that exceeds a power limit. | 03-08-2012 |
20120070177 | POWER SUPPLY CIRCUIT FOR SUPPLYING POWER TO ELECTRONIC DEVICE SUCH AS IMAGE FORMING APPARATUS - A developing unit develops a latent image with a developing agent. A supply unit supplies, to the developing unit, a developing alternating current bias voltage with a waveform having a pulse period during which a rectangular wave is output and a blank period during which no rectangular wave is output. An input signal generation unit generates, as an input signal be supplied to a primary side of a transforming unit that forms the developing alternating current bias voltage, an input signal obtained by adding an additional pulse smaller in width than the rectangular wave in the pulse period at a timing to transit from the pulse period to the blank period. | 03-22-2012 |
20120070178 | POWER SUPPLY CIRCUIT FOR SUPPLYING POWER TO ELECTRONIC DEVICE SUCH AS IMAGE FORMING APPARATUS - A voltage conversion unit converts alternating current voltage generated by an alternating current voltage generation unit into a predetermined output voltage. An adjustment unit monitors the output voltage and adjusts a driving pattern for driving the alternating current voltage generation unit in accordance with a waveform distortion generated in a rectangular wave of the output voltage. The driving pattern is a pattern having, in a half cycle of the rectangular wave of the alternating current voltage, a first ON period during which the alternating current voltage is applied to the voltage conversion unit, an OFF period during which the alternating current voltage is not applied to the voltage conversion unit, and a second ON period during which the alternating current voltage is applied to the voltage conversion unit. The adjustment unit adjusts a ratio of the first ON period, the OFF period, and the second ON. | 03-22-2012 |
20120087691 | IMAGE FORMING APPARATUS AND CONTROL METHOD THEREOF - An image forming apparatus having a normal mode and a standby mode includes an image forming unit to form an image, a switching unit which selectively allows power to be supplied to the image forming unit, a controller to control the switching unit based on a phase signal of the power, a power cut-off unit which cuts off the power to the image forming unit in the standby mode, and a phase detector which is connected to both ends of the power cut-off unit, detects a phase of the power via different phase detection routes according to whether being in the normal mode or in the standby mode, and outputs the phase signal of the power so that a power consumption of the image forming apparatus does not exceed a predetermined value in the standby mode. | 04-12-2012 |
20120093537 | IMAGE FORMING APPARATUS PERFORMING CONTROL OF CHANGING TARGETS OF POWER SUPPLY FROM CHARGING DEVICE - An image forming apparatus includes a charging device for performing charging and discharging using a power storage device, and a plurality of loads each serving as a target of power supply from said charging device and being used in operation of the image forming apparatus. The image forming apparatus obtains information about an operation status of the image forming apparatus and sets priorities for being a target of power supply from the charging device for the plurality of loads, according to the obtained information. The image forming apparatus controls power supply operation of the charging device according to the information about the remaining capacity of the power storage device and the set priorities. | 04-19-2012 |
20120114363 | POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS - A power supply system includes: a switching power supply and a rectifying/smoothing circuit, the switching power supply configured to output a first output voltage in a normal output mode; a step-down circuit; a control device that controls the switching of the switching power supply between the normal output mode, a low output mode, and an off mode; and an electric storage unit charged by the output of the step-down circuit in the normal output mode and supplies power to the control device in the off mode, wherein, when charging is needed in the mode other than the normal output mode and the low output mode, the control device controls the switching power supply to output the third output voltage, thereby charging the electric storage unit. | 05-10-2012 |
20120114364 | IMAGE FORMING APPARATUS AND OPERATION SYSTEM FOR IMAGE FORMING APPARATUS - The present invention includes a plurality of image forming apparatuses connected to a network, and a server which controls the operation state of the image forming apparatuses via the network. The image forming apparatuses are operable in a normal operation mode and in one of plural power-saving modes with different power consumption. The server individually sets the operation mode of the image forming apparatuses in accordance with a preset power-saving operation policy, and controls the image forming apparatuses so that each of the image forming apparatuses operates in the preset operation mode in each predetermined time band. | 05-10-2012 |
20120128385 | Image forming apparatus and power control method thereof - An image forming apparatus and a power control method thereof, the power control method of an image forming apparatus which includes a finisher to perform at least one of finishing jobs including arranging, sorting, grouping, folding, stapling, binding, and punching a print medium which is ejected after an image is formed thereon, the power control method including: determining whether or not a power mode of the image forming apparatus meets requirements for entering a power save mode in which power supplied to a part of elements of the image forming apparatus is shut off; determining whether or not the image forming apparatus has an ongoing job if the requirements for entering the power save mode are met; and entering the image forming apparatus in the power save mode while the power supply to the finisher is maintained if the image forming apparatus has the ongoing job. | 05-24-2012 |
20120134705 | SWITCHING POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS WITH SWITCHING POWER SUPPLY DEVICE - A current resonance type switching power supply device controls an ON/OFF operation of two switching elements according to an amount of change in voltage of a current resonance capacitor. | 05-31-2012 |
20120134706 | SWITCHING POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS INCLUDING SWITCHING POWER SUPPLY DEVICE - A switching power supply device including: a transformer configured to include a primary winding, a secondary winding, and an auxiliary winding; a switching unit configured to switch a current that flows through the primary winding of the transformer; a control unit configured to control a switching operation of the switching unit; a starting resistor connected between a voltage input side of the primary winding and a power supply terminal of the control unit; a voltage supply unit configured to rectify and smooth a voltage output from the auxiliary winding and supply the resultant to the power supply terminal; and an activation control unit configured to control activation timing of the control unit by inputting a voltage to an ON/OFF terminal of the control unit, the activation control unit being connected between the voltage input side of the primary winding and a ground side of the auxiliary winding. | 05-31-2012 |
20120134707 | POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A power supply system includes a switching power supply. The switching power supply includes an overcurrent detection circuit. The overcurrent detection circuit includes a current detecting resistor, a reference voltage generation circuit, and a comparison circuit. The current detecting resistor is provided on a secondary side of a transformer. The reference voltage generation circuit generates a first reference voltage when an output voltage of the switching power supply is a first output voltage and a second reference voltage lower than the first reference voltage when the output voltage is a second output voltage. The comparison circuit detects an overcurrent by comparing a voltage across the current detecting resistor with the first reference voltage or the second reference voltage. | 05-31-2012 |
20120155910 | IMAGE FORMING APPARATUS AND POWER SUPPLY DEVICE - A power supply device includes a first switch section that can disconnect a 24-V power supply from a commercial alternating-current (AC) power supply and that operates with the voltage of 3.3 V, and a second switch section that can disconnect a voltage detection circuit from the commercial AC power supply and that operates with the voltage of 3.3 V. When a power saving mode is on, the 24-V power supply and the voltage detection circuit are disconnected from the commercial AC power supply by using the first and second switch sections, whereby the power supply device can be used in areas where different supply voltages are used, and at the same time reduction in power consumption in the power saving mode is achieved. | 06-21-2012 |
20120155911 | IMAGE FORMING APPARATUS - An image forming apparatus having an active mode of performing image formation and an electric power saving mode of reducing electric power consumption, the apparatus including: an electric power measuring portion which measures the electric power consumption of the apparatus; a storage portion which stores electric power consumption information per unit time of the apparatus in the electric power saving mode; and a control portion which computes, based on the electric power consumption measured by the electric power measuring portion, consumed electric energy of the apparatus during a period in which the apparatus is in the active mode, and computes, based on a length of period in which the apparatus is in the electric power saving mode and the electric power consumption information stored in the storage portion, consumed electric energy of the apparatus during the period in which the apparatus is in the electric power saving mode. | 06-21-2012 |
20120195620 | SWITCHING POWER SUPPLY AND IMAGE FORMING APPARATUS - In a switching power supply, a current detection resistor is connected to a switching unit to detect a current flowing through the switching unit. A diode is connected in parallel to the current detection resistor to reduce heat generated in the switching unit by back electromotive force generated by an inductance component of the current detection resistor. | 08-02-2012 |
20120207504 | IMAGE FORMING APPARATUS - An image forming apparatus is provided. The image forming apparatus includes a plurality of photosensitive members arranged to align in parallel with one another, an exposure device arranged in an upper position with respect to the plurality of photosensitive members and configured to expose the photosensitive members to light, an exposure controller arranged in an upper position with respect to the exposure device and configured to control the exposure device according to inputted image data, a power board, arranged in a lower position with respect to the plurality of photosensitive members and configured to convert alternate current power to direct current power, and a voltage converter arranged in un upper position with respect to the exposure device and configured to convert the direct current power supplied from the power board into an at least single-leveled first voltage and supply the first voltage to the exposure controller. | 08-16-2012 |
20120207505 | DISCHARGING CIRCUIT AND POWER SUPPLY - A discharging circuit includes a filter unit connected between the input lines of a commercial AC power supply, a switch whose operations are controlled by the filter unit; and a discharging unit which discharges voltage of the capacitance element when the switch unit is turned on. | 08-16-2012 |
20120237248 | CURRENT-SUPPLY CONTROL UNIT, FUSING DEVICE, IMAGE FORMING APPARATUS, AND CURRENT-SUPPLY CONTROL METHOD - A current-supply control unit for controlling current supply to a heating element includes a voltage detector and a heating element control unit. The voltage detector detects voltage at both ends of the heating element. The heating element control unit controls a duty cycle of current supply for the heating element based on the voltages detected by the voltage detector when current is supplied to the heating element. | 09-20-2012 |
20120275812 | IMAGE FORMING APPARATUS, POWER SUPPLYING METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - An image forming apparatus includes a first control unit configured to control an image forming unit; a power supply unit configured to supply power from a commercial power source; a switching unit configured to switch a connection state between the power supply unit and the commercial power source from a conduction state to a non-conduction state, or vice versa; a capacitor configured to store therein power used by the switching unit; a second control unit configured to detect a start signal for starting power supply from the power supply unit; and a battery for supplying power to the second control unit. The power supply unit supplies power to the first control unit in the conduction state and stops the power supply in the non-conduction state. When detecting the start signal, the second control unit causes the switching unit to switch the connection state to the conduction state. | 11-01-2012 |
20120294644 | IMAGE FORMING APPARATUS - An image forming apparatus includes an attracting member and a guide member. The attracting member extends along a transport path. A print medium carries a developer image thereon and is transported on the guide member in the transport path after passing through a transfer section. The guide member is disposed downstream of the transfer section and is disposed at a position where when the print medium is transported in the transport path, the attracting member attracts the electrostatically toward the attracting member such that the print medium is spaced a distance from the attracting member by the guide member. | 11-22-2012 |
20120301172 | SWITCHING POWER SUPPLY - A switching power supply includes a transformer, a switching unit configured to switch a voltage input to the primary side of the transformer, a control unit configured to control the operation of the switching unit, and a detection unit configured to detect as a voltage a current flowing through the primary side of the transformer and supply the voltage to the control unit, wherein the detection unit controls the voltage to be supplied to the control unit based on the operating state of the switching unit. | 11-29-2012 |
20120321336 | IMAGE FORMING APPARATUS - An image forming apparatus includes a primary transfer device to transfer a toner image formed on a photosensitive member onto an intermediate transfer member formed into a loop, a secondary transfer device disposed outside the looped belt to contact the intermediate transfer member to form a secondary transfer nip therebetween and transfer the toner image from the intermediate transfer member onto a recording medium, a first power supply to apply a constant-current controlled direct current bias to an inner circumferential side of the intermediate transfer member, and a second power supply to form an alternating electric field between the intermediate transfer member and the recording medium. The direct current bias has the same polarity as that of the toner image. The first power supply and the second power supply apply predetermined biases simultaneously when the recording medium is in the secondary transfer nip to transfer the toner image thereon. | 12-20-2012 |
20120321337 | IMAGE FORMING APPARATUS AND DISCHARGE DEVICE - An apparatus includes a CPU, wherein, when the apparatus is currently in a power OFF state, and if an operation different from that of a power source switch is performed, the CPU connects a load to a power source by the switch to discharge a capacitor. | 12-20-2012 |
20120321338 | POWER SUPPLY DEVICE AND IMAGE FORMATION APPARATUS - A power supply device includes a voltage output unit configured to output a DC voltage corresponding to a control signal from a first controller and an output evaluator configured to perform a judgment process of judging whether or not the DC voltage is a voltage corresponding to a set value received from the fist controller, and to output a result of the judgment to the first controller. The output evaluator includes a storage for storing correspondence information which shows a correspondence relationship between the set value and a voltage value of the DC voltage outputted from the voltage output unit. The output evaluator performs the judgment process by outputting the correspondence information to the first controller, and receiving a set value determined on the basis of the correspondence information from the first controller. | 12-20-2012 |
20120328320 | POWER SUPPLY MODULE AND IMAGE FORMING APPARATUS INCLUDING SAME - An image forming apparatus includes an image bearing member to bear a toner image on a surface thereof, a transfer unit including a transfer device to transfer the toner image onto a recording medium, disposed opposite the image bearing member, a direct current (DC) power source to apply, between the image bearing member and the transfer device, a DC bias to form a first transfer electric field to transfer the toner image onto the recording medium, and a power supply module detachably attachable relative to the image forming apparatus. The power supply module includes an AC-DC superimposed bias power source to apply, between the image bearing member and the transfer device, a superimposed bias in which an alternating voltage is superimposed on a DC voltage to form a second transfer electric field to transfer the toner image onto the recording medium. | 12-27-2012 |
20120328321 | IMAGE FORMING APPARATUS, IMAGE FORMING SYSTEM, AND TRANSFER METHOD - An image forming apparatus includes a transfer unit configured to transfer a toner image onto a recording medium; a power supply unit configured to apply one of a superimposed voltage in which an alternating-current voltage and a first direct-current voltage are superimposed and a second direct-current voltage to the transfer unit; and a power supply control configured to, when the power supply unit outputs the superimposed voltage, instruct the power supply unit to output the first direct-current voltage at a first timing, and, when the power-supply unit outputs the second direct-current voltage, instruct the power-supply unit to output the second direct-current voltage at a second timing which is later than the first timing. | 12-27-2012 |
20120328322 | PIEZOELECTRIC TRANSDUCER DRIVER, POWER SUPPLY DEVICE, AND IMAGE FORMATION APPARATUS - A piezoelectric transducer driver configured to drive a piezoelectric transducer for converting an inputted alternating-current voltage, includes: a drive circuit configured to generate the alternating-current voltage to be inputted into the piezoelectric transducer; a frequency controller configured to control a frequency of the alternating-current voltage as a drive frequency to be applied to the piezoelectric transducer; and a pulse generation circuit configured to generate a drive pulse having a switching frequency corresponding to the drive frequency, and to output the drive pulse to the drive circuit. The drive circuit includes a switching element configured to generate the alternating-current voltage by executing a switching operation corresponding to a pulse width of the drive pulse, and the pulse generation circuit changes the pulse width depending on the switching frequency. | 12-27-2012 |
20130011156 | IMAGE FORMING APPARATUS - In an image forming apparatus including a fixing unit having a film and a heater in contact with the inner surface of the film, an electrical breakdown may occur in the protection layer of the heater, when a surge voltage is applied to a power supply line connected to the heater. An arrester is provided on a power supply line connected to the heater of the image forming apparatus. | 01-10-2013 |
20130016989 | POWER SUPPLY MODULE AND IMAGE FORMING APPARATUS INCLUDING SAMEAANM FUJITA; JunpeiAACI KanagawaAACO JPAAGP FUJITA; Junpei Kanagawa JPAANM Takeuchi; TomokazuAACI TokyoAACO JPAAGP Takeuchi; Tomokazu Tokyo JPAANM Haga; HiroyoshiAACI KanagawaAACO JPAAGP Haga; Hiroyoshi Kanagawa JPAANM Ogiyama; HiromiAACI TokyoAACO JPAAGP Ogiyama; Hiromi Tokyo JPAANM Shimizu; YasunobuAACI KanagawaAACO JPAAGP Shimizu; Yasunobu Kanagawa JPAANM Sengoku; KenjiAACI KanagawaAACO JPAAGP Sengoku; Kenji Kanagawa JP - An image forming apparatus includes an image bearing member, a transfer unit, a control circuit board, and a power supply module detachably attachable relative to the image forming apparatus. The image bearing member bears a toner image on a surface thereof. The transfer unit includes a transfer device to transfer the toner image onto a recording medium and is disposed opposite the image bearing member. The control circuit board controls the transfer unit. The power supply module is disposed in the transfer unit and includes a power source to apply, between the image bearing member and the transfer device, an AC-DC superimposed bias in which an alternating voltage (AC) is superimposed on a direct current (DC) voltage to form a transfer electric field to transfer the toner image from the image bearing member onto the recording medium. | 01-17-2013 |
20130016990 | POWER SUPPLY APPARATUS AND METHOD OF SUPPLYING POWER - A power supply apparatus, an apparatus, and a method of supplying power are provided. The power supply apparatus including a high voltage generating unit, which generates one or more output voltages by using an input voltage, and which is implemented as a chip. The one or more output terminals are on a same circuit board as the high voltage generating unit, to output the generated one or more output voltages. The chip includes a transforming unit to transform the input voltage into one or more transformed voltages that are different from one another, and a rectifying unit to rectify the transformed voltages into rectified voltages, and to determine the rectified voltages as the generated one or more output voltages. | 01-17-2013 |
20130045023 | HIGH-VOLTAGE POWER-SUPPLY APPARATUS, AND IMAGE FORMATION APPARATUS - A high-voltage power-supply apparatus comprises a controller configured to output a control signal containing a pulse with a variable drive frequency; a switching unit configured to be switched by the control signal and output a drive signal; a piezoelectric transducer having a predetermined resonant frequency, and configured to be driven by the drive signal and output a high-voltage output voltage; a current detector configured to detect an electric current of a load connected to an output side of the piezoelectric transducer and output a current-detection result; and a lower-limit-value setup unit configured to set a frequency lower limit value for the drive frequency of the controller. The controller is configured to vary the frequency lower limit value in accordance with the current-detection result. | 02-21-2013 |
20130064565 | HIGH VOLTAGE POWER SUPPLY AND IMAGE FORMING APPARATUS - The high voltage power supply includes a first high voltage output unit that outputs a high voltage having a predetermined polarity, and second and third high voltage output units that output a high voltage having a polarity opposite to the predetermined polarity, wherein rectification units connected to the first high voltage output unit separate a current path to the second high voltage output unit from a current path to the third high voltage output unit. | 03-14-2013 |
20130064566 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS - The power supply apparatus includes a transformer, a switching section, a feedback section; a control section; and a resistor adapted to separate a first ground and a second ground from each other on the secondary side of the transformer, the first ground being located on a load side supplied with the output voltage while the second ground being located closer to the transformer than is the first ground, wherein a second resistor is connected to the second ground and a reference voltage of the feedback section is connected to the first ground. | 03-14-2013 |
20130071134 | POWER CONTROL METHOD, POWER CONTROL DEVICE, AND IMAGE FORMING APPARATUS - A power control method for supplying AC power to a first load and a second load is provided. The method includes supplying, to the first load, AC power corresponding to a range of a phase angle 0 to a phase angle φ1 in each half cycle; and supplying, to the second load, AC power corresponding to a range of a phase angle φ2 to a phase angle π in each half cycle, wherein φ1 is larger than 0 and not more than π, φ2 is not less than 0 and smaller than π, and φ1 is larger than φ2. | 03-21-2013 |
20130094876 | IMAGE FORMING APPARATUS CALCULATING POWER CONSUMPTION AMOUNT - An image forming apparatus includes a first power calculator for calculating a power consumption amount of a driving load unit and a post-processing device based on at least one of measured values of a voltage and a current, which are supplied to the driving load unit and the post-processing device; second and third power calculators for calculating power consumption amounts of a fixing heater driving unit and a controller based on an operating state and an operating time of the image forming apparatus; and a power summing-up unit for calculating a power consumption amount of the image forming apparatus by summing up the power consumption amount calculated by the first power calculator and the power consumption amount predicted by each of the second and third power calculators. | 04-18-2013 |
20130101306 | POWER CONTROL APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A power control apparatus and an image forming apparatus including the same are disclosed. The power control apparatus can directly enable or disable a DC/DC converter for converting reference DC power to a secondary DC power without an additional microcomputer based power circuit by connecting an enable or disable operation of the DC/DC converter with an operation of a power button by a user. Accordingly, the number of components of a power control circuit can be reduced to decrease material cost and simplify the power control circuit. Furthermore, the power control apparatus and the image forming apparatus including the same can reduce unnecessary power consumption in a system off state. | 04-25-2013 |
20130108303 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS INCLUDING THE SAME | 05-02-2013 |
20130108304 | POWER SUPPLY AND IMAGE FORMING APPARATUS | 05-02-2013 |
20130108305 | ELECTRIC POWER RELAYING UNIT AND IMAGE FORMING APPARATUS HAVING THE SAME | 05-02-2013 |
20130114969 | POWER CONTROL METHOD, POWER CONTROL DEVICE, AND IMAGE FORMING APPARATUS - A power control method for performing phase control is provided. The method includes generating a zero-crossing signal that indicates a first level if an absolute value of AC voltage is smaller than a predetermined value, and indicates a second level if the absolute value of the AC voltage is larger than the predetermined value; detecting a zero-crossing width and a non-zero-crossing width, the zero-crossing width being a time width for a case where the absolute value of the AC voltage is smaller than the predetermined value, the non-zero-crossing width being a time width for a case where the absolute value is larger than the predetermined value; detecting a frequency and a voltage value of the AC voltage based on the zero-crossing width and the non-zero-crossing width; and performing phase control depending on the frequency and the voltage value. | 05-09-2013 |
20130114970 | HIGH-VOLTAGE POWER SOURCE - A high-voltage power source includes a switching unit configured to be driven according to a frequency signal, a voltage resonance unit configured to generate a voltage according to driving of the switching unit, a rectification unit configured to rectify and amplify the voltage generated by the voltage resonance unit, a separation unit configured to separate an alternating current generated by the voltage resonance unit and a direct current generated by the rectification unit from each other, and a current detection unit configured to detect the current generated by the voltage resonance unit. | 05-09-2013 |
20130121717 | IMAGE FORMING APPARATUS - The image forming apparatus includes a fixing section which has a heater and heats and fixes an unfixed image, formed on a recording material, to the recording material, a power supply section which has a rectification section rectifying alternating current, a power factor improvement section receiving input of current output from the rectification section, and a DC/DC converter DC/DC converting current output from the power factor improvement section, a current detection section which detects current flowing to the heater, and a control section which controls operation of the power factor improvement section according to current detected by the current detection section. | 05-16-2013 |
20130121718 | METHOD FOR DELIVERING ELECTRIC POWER TO POWER CONSUMERS OF A PRINTING TECHNOLOGY MACHINE - A method for delivering electric power to power consumers of a printing technology machine, which permits high availability of the machine with low idling losses, includes taking start-up time periods of the power consumers into account when switching over the power delivery to power consumers of a printing machine. | 05-16-2013 |
20130129373 | POWER SUPPLY SYSTEM, IMAGE FORMING APPARATUS HAVING THE SAME, AND LOW-CAPACITY AC PROCESSING CIRCUIT - A power supply system includes: a switching power supply to be connected to an AC power supply, the switching power supply rectifying and smoothing an AC voltage to generate predetermined DC voltage; a first capacitor including a first electrode connected to one end of the AC power supply, and a second electrode; a second capacitor including a first electrode connected to the other end of the AC power supply, and a second electrode; a surge-voltage suppressing circuit connected between the second electrode of the first capacitor and the second electrode of the second capacitor; a rectifier circuit connected to a first contact node between the first capacitor and the surge-voltage suppressing circuit and a second contact node between the second capacitor and the surge-voltage suppressing circuit; and an output-signal generating circuit connected to the rectifier circuit, and uses the rectified current to generate a predetermined output signal. | 05-23-2013 |
20130148997 | CONTROL DEVICE AND ELECTRONIC APPARATUS - A control device according to the present invention includes a first control unit configured to control supply and stop of electric power from a power supply to a processing unit configured to perform processing, a switching unit configured to switch to an electrical continuity state or an electrical discontinuity state between a power supply wire to which the electric power from the power supply is supplied and the first control unit, and a second control unit configured to control, if the first control unit stops power supply from the power supply to the processing unit, the switching unit so as to achieve the electrical discontinuity state and controls, if a return factor indicating a factor to return to the electrical continuity state is input in the electrical discontinuity state, the switching unit so as to make the electrical continuity state. | 06-13-2013 |
20130148998 | POWER SUPPLY INCLUDING ZERO-CROSS DETECTION CIRCUIT, AND IMAGE FORMING APPARATUS - A power supply includes a first capacitor, a resistor for discharging an electric charge of the first capacitor and for detecting zero crossing of the AC voltage input from the AC power supply, a second capacitor, and a frame ground o and a discharge resistor having a resistance value smaller than the resistor and configured to discharge an electric charge of the second capacitor, and switches between a state where a current to the discharge resistor is cut off and a state where a current flows through the discharge resistor. | 06-13-2013 |
20130156459 | POWER SUPPLY AND IMAGE FORMING APPARATUS EQUIPPED WITH POWER SUPPLY - A power supply includes a rectification unit configured to be able to switch a rectification method between a voltage doubler rectification method and a full-wave rectification method according to an input alternating voltage, two capacitive elements serially connected between lines from the rectification unit, a monitoring unit configured to monitor a first voltage applied between the lines between which the two capacitive elements are connected and a second voltage applied across one of the capacitive elements that is connected to a lower potential side of the lines, and a switch configured to operate according to the second voltage, wherein the power supply interrupts the alternating voltage according to an operating state of the switch, the first voltage, and the second voltage. | 06-20-2013 |
20130164016 | POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS - A power supply system for AC-DC conversion, includes: a first rectifying/smoothing circuit configured to rectify and smooth an AC voltage applied from an AC power supply; a switching power supply configured to perform voltage conversion on an output voltage of the first rectifying/smoothing circuit, and output the converted voltages; an accumulating unit configured to receive a charging current from the switching power supply; a detecting unit configured to detect input/cutoff of the AC power supply; and a control device configured to receive supply of electric power from the accumulating unit and stop the switching power supply if the detecting unit detects the cutoff of the AC power supply. | 06-27-2013 |
20130164017 | POWER SUPPLY CIRCUIT, IMAGE FORMING APPARATUS INCORPORATING SAME, AND POWER SUPPLY METHOD TO SUPPLY VOLTAGE TO IMAGE FORMING APPARATUS - A power supply circuit includes a voltage regulator to which a first high voltage is supplied, to operate at constant voltage and regulate the supplied first high voltage, and a first rectifier circuit to which the first high voltage is supplied, connected in parallel to the voltage regulator, to rectify the supplied first high voltage for output as a first DC voltage. When the first high voltage is a pseudo-alternating-current (AC) voltage consisting of two types of high voltages that alternate, the voltage regulator regulates each of the two different types of the voltages to output a desired pseudo-AC voltage. | 06-27-2013 |
20130164018 | METHOD TO CONTROL THE POWER REQUIREMENT OF A DIGITAL HIGH-CAPACITY PRINTING SYSTEM, AND HIGH-CAPACITY PRINTING SYSTEM TO EXECUTE THIS METHOD - In a method or system to control a power requirement of a digital high-capacity printing system that comprises a plurality of individual modules, the modules are connected to a common main current line with which they are supplied with operating current. The individual modules are each provided with a respective processor controller that are connected via a respective data line with a central control device. The individual modules and the central control device are respectively connected to an auxiliary current line that supplies the processor controllers and the central control device with current, independently of the main current line. With the central control device, the individual processor controllers are controlled such that a change of the power requirement is controlled such that at least two of the modules execute the change of the power requirement offset by a predetermined time interval. | 06-27-2013 |
20130164019 | ELECTRONIC DEVICE AND IMAGE FORMING APPARATUS - An electronic device includes a first voltage output part configured to output a first voltage, a second voltage output part configured to output a second voltage, a first controller configured to receive the first voltage supplied from the first voltage output part, a second controller configured to receive the first voltage supplied from the first voltage output part, and a third controller configured to receive the second voltage supplied from the second voltage output part. The first controller stops the supply of the first voltage to the second controller by the first voltage output part after the supply of the second voltage to the third controller by the second voltage output part has been stopped. | 06-27-2013 |
20130177331 | PWM GENERATING UNIT, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD - A PWM generating unit may include a base duty setting register configured to store a base duty value that is set thereto, and a PWM generator to obtain a corrected duty value by correcting the base duty value based on first correction data and second correction data, and to generate a PWM signal according to the corrected duty value. The first correction data may be computed from a rotation period of a first rotational body, and the second correction data may be computed from a rotation period of a second rotational body. | 07-11-2013 |
20130188979 | POWER SOURCE DEVICE, ELECTRONIC DEVICE, IMAGE FORMING APPARATUS, AND POWER SOURCE CONTROL METHOD - A power source device includes: a first voltage generating unit that includes a power storage unit storing power based on power supplied from a power source and generates a voltage to be supplied to a first load based on the power supplied from the power source; and a second voltage generating unit that generates a voltage to be supplied to a second load based on the power stored in the power storage unit when the first voltage generating unit is controlled to stop generation. | 07-25-2013 |
20130188980 | IMAGE FORMING APPARATUS - An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a current supply member contacting the outer circumferential surface of the intermediate transfer belt to pass a current from the current supply member to the plurality of photosensitive drums via the intermediate transfer belt, thus primarily transferring the toner images from the plurality of photosensitive drums onto the intermediate transfer belt. | 07-25-2013 |
20130188981 | IMAGE FORMING APPARATUS - An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a current supply member contacting the intermediate transfer belt to pass a current from the current supply member to the plurality of photosensitive drums via the intermediate transfer belt, thus generating electric discharge on the upstream side of each of primary transfer sections. | 07-25-2013 |
20130195496 | Power Supply Control Device Including Switching Regulator and Linear Regulator, Image Forming Apparatus Including the Same, and Electronic Apparatus Including the Same - A power supply control device includes a switching regulator, a linear regulator, a switching unit, a consumed current detection unit, a current determination unit, and a power determination unit. The consumed current detection unit detects a consumed current of the regulator serving as a power supply to the load. The current determination unit determines whether or not the consumed current is greater than or equal to a predetermined current. The power determination unit determines whether or not a consumed power of the regulator is greater than or equal to a predetermined power. The switching unit connects the linear regulator to the load when the consumed current is lower than the predetermined current and the consumed power is lower than the predetermined power. | 08-01-2013 |
20130195497 | POWER SOURCE, POWER FAILURE DETECTION APPARATUS, AND IMAGE FORMING APPARATUS - A power source includes a rectifying unit configured to full-wave rectify an AC voltage to be input, a first and second converter configured to convert the voltage rectified by the rectifying unit, a zero cross detection unit configured to detect a zero cross of the AC voltage, a voltage detection unit configured to detect the AC voltage, a first capacitance element connected across a potential after being subjected to rectification by the rectifying unit and a ground, a first discharging resistor configured to discharge electric charges charged in the first capacitance element, a first switch unit configured to cut off a current flowing to the first discharging resistor and a stopping unit configured, in a case where the AC voltage is detected by the voltage detection unit and the detected voltage is smaller than a threshold value, to stop the operation of the second converter. | 08-01-2013 |
20130195498 | POWER CONTROL DEVICE, ELECTRONIC APPARATUS, AND IMAGE FORMING APPARATUS - A power control device includes a power control unit, a power switch, a timer unit, a power supply switch, and a connection instruction unit. The power control unit is driven by power supplied from a power source. The power switch outputs a detection signal to the power control unit. The timer unit outputs a switch-on signal for giving an instruction to turn on the switch. The power supply switch switches between connection and non-connection of the power source and a load. The connection instruction unit outputs a connection instruction signal for connecting the power source to the load. The power control unit outputs a stop signal for stopping the output of the switch-on signal to the timer unit before a time point at which the predetermined time elapses when the power is supplied from the power source. The power control unit outputs the switch-on signal to the connection instruction unit. | 08-01-2013 |
20130209133 | TECHNOLOGY FOR REDUCING CIRCUIT OSCILLATIONS AND RIPPLE IN A HIGH-VOLTAGE POWER SUPPLY USING A PIEZOELECTRIC TRANSFORMER - A high-voltage power supply comprises the following components. A piezoelectric transformer outputs a voltage in accordance with a supplied drive frequency. A rectification part is connected to an output side of the piezoelectric transformer. A drive frequency generating part generates the drive frequency supplied to the piezoelectric transformer. A voltage detection part detects an output voltage of the piezoelectric transformer or the rectification part. A control part controls the drive frequency generating part such that a drive frequency corresponding to the output voltage detected by the voltage detecting part is generated. A first time constant, which is a time constant of the control part, is smaller than a second time constant, which is a time constant of a control target including the piezoelectric transformer and the rectification part. A third time constant, which is a time constant of the voltage detecting part, is smaller than the second time constant. | 08-15-2013 |
20130223867 | POWER SUPPLY, IMAGE FORMING DEVICE, AND POWER SUPPLY METHOD - Disclosed is a power supply including a first voltage generating unit that generates a first voltage from an external power supply; a second voltage generating unit that generates a first predetermined voltage and supplies the generated first predetermined voltage to the load; a third voltage generating unit that generates the first predetermined voltage and supplies the generated first predetermined voltage to the load; and a controller that causes the first voltage to be greater than or equal to a second voltage during a first mode, and causes the first voltage to be less than the second voltage during a second mode. During the first mode, the power is supplied from the second voltage generating unit and the third voltage generating unit to the load, and during the second mode, the power is supplied from the third voltage generating unit to the load. | 08-29-2013 |
20130223868 | IMAGE FORMING APPARATUS - An image forming apparatus includes a printing engine to form an image on a printing medium through printing processes, an engine frame to support the printing engine having a driving system to drive the printing engine, a high voltage power supply provided in a surface of the engine frame to apply a high voltage to at least one of units performing the printing processes, a main board provided in a surface of the engine frame adjacent to the surface having the high voltage power supply, and having a system engine controller to control the printing engine and a video controller to control a video signal, first and second main connectors respectively provided at lateral sides of the high voltage power supply and the main board adjacent to each other, and a connection control line to connect the first and second main connectors. | 08-29-2013 |
20130236203 | POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS - The power supply device includes a transformer, a switching unit for driving a primary side of the transformer, a control unit for outputting a pulse signal to the switching unit to control a switching operation including a period during which the switching unit is active and a period during which the switching unit is inactive, in order to output predetermined electric power from a secondary side of the transformer, and an output control unit for continuously outputting a pulse signal to the control unit in the period during which the switching unit is active, at a predetermined cycle shorter than the period during which the switching unit is inactive. | 09-12-2013 |
20130236204 | POWER SOURCE DEVICE AND IMAGE FORMING APPARATUS - A power source device includes: a transformer; a switching section driving a primary side of the transformer; and a controller capable of performing a switching operation on driving of the switching section for controlling an output of a secondary side of the transformer. The device detects a drive frequency for the switching section in the switching operation, and switches the drive frequency so as not to be a frequency in a prescribed range when the detected drive frequency reaches a threshold. | 09-12-2013 |
20130236205 | IMAGE PROCESSING APPARATUS OPERABLE BY AC POWER AND DC POWER, METHOD OF CONTROLLING THE APPARATUS, AND STORAGE MEDIUM - An image processing apparatus that is operable by AC power and DC power. The image processing apparatus includes a fixing heater section for heating a recording sheet having toner transferred thereon so as to fuse the toner onto the sheet and a plurality of electronic circuits. An AC power supply circuit section receives AC power from an AC power supply line. A DC power supply circuit section receives DC power from a DC power supply line. A power supply unit supplies the AC power received by the AC power supply circuit section to the fixing heater section, and the DC power received by the DC power supply circuit section to the plurality of electronic circuits. | 09-12-2013 |
20130236206 | POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS - The power supply device includes a transformer, a switching unit for driving a primary side of the transformer, a detection unit for detecting an output corresponding to a current flowing on the primary side, a transmission unit for transmitting an output voltage from a secondary side to the primary side, and a control unit for controlling an operation of the switching unit in accordance with an output from the transmission unit, in which, when a switching frequency for driving the switching unit falls within a predetermined frequency range including a resonant frequency of the transformer, the control unit controls the switching unit so as to shorten a turn-ON time of the switching unit in accordance with an output from the detection unit. | 09-12-2013 |
20130272742 | DC/DC CONVERTER AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A converter includes a switching unit configured to switch a voltage to be input, an inductor connected to the switching unit, a conversion unit configured to convert the voltage switched by the switching unit to be supplied to the inductor into a direct current voltage, a detection unit configured to detect the direct current voltage converted by the conversion unit, and a correction unit configured to correct the detected voltage detected by the detection unit, wherein an operation of the switching unit is controlled based on the voltage corrected by the correction unit. | 10-17-2013 |
20130287424 | VOLTAGE GENERATING DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE SAME - A power supply apparatus outputs a developing voltage in which a pulse wave shape at a time of positive amplitude is different from a pulse wave shape at a time of negative amplitude. Voltages are supplied from two switching regulators respectively to a bridge circuit for driving a transformer. Here, an absolute value of a difference between a drive frequency of a first switching regulator and a drive frequency of a second switching regulator is configured to be not less than an invisible frequency at which a banding cannot be recognized by humans. | 10-31-2013 |
20130315614 | POWER CONTROL SYSTEM AND POWER CONTROL METHOD - A power control system includes an image forming apparatus, a power calculating unit, and a condition controller. The image forming apparatus operates using power, forms an image corresponding to image information in a first operation mode, and enters a second operation mode in which power consumption is smaller than the first operation mode when the image forming apparatus satisfies a specific transition condition. The power calculating unit calculates power supplied from a power supplying unit. The condition controller controls the specific transition condition for the image forming apparatus in accordance with the power calculated by the power calculating unit. | 11-28-2013 |
20130322911 | IMAGE FORMING APPARATUS - An image forming apparatus is configured to electro-photographically form an image and includes a main body frame which includes a side wall, an outer cover which covers an outer face of the main body frame, a high-voltage board which includes a high-voltage generator circuit configured to generate a high voltage and supply an electric power to a device requiring a high-voltage power source, and a main board which includes a main control circuit configured to perform a control on an image forming process of the image forming apparatus. In a side region which is formed by the side wall of the main body frame and the outer cover, the high-voltage board and the main board are disposed along the side wall to overlap with each other at least partially, and the high-voltage board is disposed on an outer side relative to the main board. | 12-05-2013 |
20140003832 | IMAGE FORMING APPARATUS THAT CARRIES OUT IMAGE FORMATION USING ELECTROPHOTOGRAPHIC METHOD | 01-02-2014 |
20140010564 | IMAGE FORMING APPARATUS, BIAS POWER SUPPLY DEVICE, AND BIAS POWER SUPPLY METHOD - An image forming apparatus includes an image carrier, a charging unit, an exposure unit, a developing unit, and a transfer unit. The transfer unit includes a transfer bias power supply and transfers a developed image onto a transfer body. The transfer bias power supply includes a first power supply unit that generates a non-transfer electric field, a second power supply unit that generates a transfer electric field, a first switching controller, and a second switching controller. The first switching controller controls start of supply of the transfer electric field in accordance with a first time constant when switching from the non-transfer electric field to the transfer electric field is performed. The second switching controller controls stop of supply of the transfer electric field in accordance with a second time constant when switching from the transfer electric field to the non-transfer electric field is performed. | 01-09-2014 |
20140010565 | PROCESSING APPARATUS, IMAGE FORMING APPARATUS, PROCESSING METHOD AND COMPUTER READABLE INFORMATION RECORDING MEDIUM - A processing apparatus that an uninterruptible power supply system supplies power to and carries out a process. The processing apparatus includes an electric energy amount determination part that determines, based on a charged amount of electric energy in the uninterruptible power supply system, an amount of maximum electric energy that the uninterruptible power supply system can supply; and a function selection part that selects, depending on the amount of maximum electric energy, functions that can be used for carrying out the process. | 01-09-2014 |
20140010566 | IMAGE PROCESSING APPARATUS, POWER SAVE CONTROL METHOD, AND NON-TRANSITORY RECORDING MEDIUM STORING POWER SAVE CONTROL PROGRAM - An image processing apparatus, a method of controlling a power save state of the image processing apparatus, and a non-transitory recording medium storing a power save control program are provided. In response to detection of a power save transition factor that triggers transition to a power save state, the image processing apparatus determines whether a power save extension factor is detected, extends transition to the power save state at least during when the power save extension factor is being detected, and causes transition to the power save state according to the detected power save transition factor when the power save extension factor is not detected. | 01-09-2014 |
20140037318 | HIGH-VOLTAGE POWER SUPPLY FOR IMAGE FORMING APPARATUS - A high-voltage power supply for an image forming apparatus compares a detected output voltage generated by dividing a high-voltage output by a voltage dividing circuit with a control value to feedback control the high-voltage output and outputs a voltage that is to be applied to a member involved in image formation. The high-voltage power supply includes a printed circuit board on which a resistor connected to a high-voltage output side of the voltage dividing circuit is mounted. A slit including a first portion and a second portion is formed in the printed circuit board. The first portion extends across a straight line connecting terminals of the resistor. The second portion continues from the first portion and extends in a direction receding from one of the terminals of the resistor. | 02-06-2014 |
20140050501 | IMAGE FORMING APPARATUS AND METHOD OF CONTROLLING POWER THEREOF - An image forming apparatus includes a power supply unit to generate DC power, a plurality of function units to perform the functions of the image forming apparatus, a control unit to control the operation of a plurality of function units, a switching unit to receive DC power of the power supply unit and switch power provided to the control unit and each of a plurality of function units, and a power management unit to receive DC power of the power supply unit and to control a switching operation of the switching unit according to an operation mode of the image forming apparatus. | 02-20-2014 |
20140064774 | IMAGE FORMING APPARATUS, POWER CONTROL METHOD, AND RECORDING MEDIUM - An image forming apparatus comprises: a piezoelectric sensor that produces an variable output signal depending on the amount of infrared energy; a human body detecting device having a lens that forms a detecting area serving for detecting if the person enters; a peak detector that detects a peak of an output signal produced when the person enters the detecting area; an offset voltage judgment portion that judges if the output signal falls to the offset voltage after the peak; a moving direction judgment portion that judges the direction in which the person moves in the detecting area; and a mode controller that switches the power supply mode to a first mode if the power supply mode is found to be a second mode requiring less power than the first mode while the moving direction judgment portion judges that the person moves toward the image forming apparatus. | 03-06-2014 |
20140072323 | IMAGE FORMING APPARATUS, AND METHOD OF CONTROLLING IMAGE FORMING APPARATUS - In a first power state of an image forming apparatus in which a first power supply unit supplies power to a network I/F but does not supply power to a central processing unit (CPU), if a received packet is a first type packet, a power supply control unit shifts the image forming apparatus to a second power state in which the first power supply unit supplies power to the CPU but the second power supply unit does not supply power to the image forming unit. If the received packet is a second type packet, the power supply control unit shifts the image forming apparatus to a third power state in which the first power supply unit supplies power to the CPU and the second power supply unit supplies power to the image forming unit. | 03-13-2014 |
20140079429 | IMAGE FORMING APPARATUS - An image forming apparatus includes a power supply circuit, at least one motor configured to receive electric power from the power supply circuit, a photosensitive body configured to be rotated by the motor for forming an image on a sheet, a charger configured to charge the photosensitive body, a high voltage generation circuit configured to receive electric power from the power supply circuit and generate a high voltage applied to the charger, and a control device. The control device is configured to determine whether a motor activation condition to activate the motor is satisfied, determine whether a limitation condition to limit a peak of a current output from the power supply circuit is satisfied, and regulate the current flowing through the high-voltage generation circuit if the motor activation condition and the limitation condition are satisfied. | 03-20-2014 |
20140086611 | IMAGE FORMING APPARATUS AND BIAS POWER SUPPLY APPARATUS AND METHOD - An image forming apparatus includes an image carrier and the following elements. A charging unit generates a charging electric field and charges the image carrier with the charging electric field. An exposure unit exposes the charged image carrier to light and forms an electrostatic latent image on the image carrier. A developing unit generates a developing electric field and develops the electrostatic latent image. A transfer unit transfers the developed image onto a transfer subject. At least one of the charging electric field and the developing electric field is generated by a bias power supply unit including a transformer having a primary winding and a secondary winding, and also including the following elements. A switch circuit supplies a current to the primary winding of the transformer by switching a switching device. A modulator circuit generates a PWM modulation signal. A waveform setting unit sets a waveform of a carrier signal. | 03-27-2014 |
20140099139 | SWITCHING POWER SUPPLY AND IMAGE FORMING APPARATUS EQUIPPED WITH SWITCHING POWER SUPPLY - A power supply device including a transformer having a primary winding and a secondary winding, and a switching element connected to the primary winding configured to drive the switching element to output voltage from the secondary winding includes a control unit configured to drive the switching element such that the switching element is turned on and, in which, in a case where the control unit performs an intermittent drive operation which repeats a period for which the switching element is driven and a period for which the drive of the switching element is stopped, in which the control unit drives the switching element such that the switching element is turned off before the voltage according to the current flowing to the primary winding reaches the voltage output from the secondary winding in the period for which the switching element is driven. | 04-10-2014 |
20140105632 | HIGH VOLTAGE POWER SUPPLY AND METHOD OF OUTPUTTING PLUS/MINUS HIGH-VOLTAGE IN IMAGE FORMING APPARATUSES - A high-voltage power supply to output a plus/minus high-voltage, which is applied to image forming apparatuses, includes a plus high-voltage output unit outputting the plus high-voltage by using a Pulse Width Modulation (PWM) signal, a minus high-voltage operation control unit charging a certain voltage while the plus high-voltage output unit is outputting the plus high-voltage, a minus high-voltage output unit outputting the minus high-voltage by using the certain voltage charged in the minus high-voltage operation control unit, and a minus high-voltage blocking unit to block the output of the minus high-voltage from the minus high-voltage output unit while the plus high-voltage output unit is outputting the plus high-voltage. | 04-17-2014 |
20140119766 | IMAGE FORMING APPARATUS, CONTROL METHOD FOR IMAGE FORMING APPARATUS, AND STORAGE MEDIUM FOR SWITCHING A POWER SOURCE OF A COOLING UNIT - An image forming apparatus for performing job processing includes a power supplying unit configured to supply power to a heating unit, a cooling unit configured to cool an inside of an enclosure of the image forming apparatus, a power generating unit configured to generate power by heat dissipated from the heating unit, a power storage unit configured to store the power generated by the power generating unit, and a power supply control unit configured to, after driving the cooling unit by the power from one of the power supplying unit and the power generating unit, switch a power source of the cooling unit from one of the power supplying unit and the power storage unit to the power generating unit. | 05-01-2014 |
20140147157 | IMAGE FORMING DEVICE AND CHARGING METHOD FOR SECONDARY BATTERY - The image forming device includes a reception unit, an image forming unit, a switching unit, a detection unit, and a charging unit. The switching unit switches the image forming device between a first mode in which the reception unit is not supplied a voltage from a power source, is supplied power from a secondary battery, and receives image forming requests, and a second mode in which the image forming unit is supplied the voltage and performs image forming. The detection unit detects a value of an amount of energy of the secondary battery. In the second mode, the charging unit charges the secondary battery by supplying the voltage to the secondary battery when the value is equal to or less than a threshold value, and the charging unit boosts the voltage and supplies the boosted voltage to the secondary battery when the value is greater than the threshold value. | 05-29-2014 |
20140161478 | CONSTANT CURRENT-TYPE HIGH-VOLTAGE POWER SUPPLY APPARATUS AND METHOD OF CONTROLLING POWER OUTPUT FROM THE SAME - A constant current-type high-voltage power supply apparatus which is used in an image forming apparatus includes a leakage current detection unit that detects a leakage current leaked from at least one output terminal of the constant current-type high-voltage power supply apparatus and outputs the detected leakage current, a direct current voltage output unit that outputs different direct current (DC) voltages according to whether the leakage current detected by the leakage current detection unit is input, and a power control unit that controls power supply to the constant current-type high-voltage power supply apparatus according to the output DC voltage. | 06-12-2014 |
20140186066 | POWER SUPPLY SYSTEM AND IMAGE FORMING APPARATUS HAVING THE SAME - A power supply system includes: a switching power supply configured to rectify and smooth an AC voltage of an AC power supply to generate a predetermined DC voltage; a low-capacity power supply circuit that generates a zero-cross detection signal corresponding to zero-cross points of the AC power supply based on a rectified current flowing in a smoothing capacitor; and a controller configured to receive the zero-cross detection signal from the signal generating circuit and perform a determining process of determining whether it is possible to perform detection process of the zero-cross points based on a voltage value of the zero-cross detection signal. If the control unit determines that it is possible to perform the detection process of the zero-cross points, the control unit performs a zero-cross point detecting process of detecting the zero-cross points based on the zero-cross detection signal. | 07-03-2014 |
20140186067 | SWITCHING POWER SOURCE, POWER-SUPPLY SYSTEM AND IMAGE FORMING APPARATUS - A switching power source includes: a transformer; a semiconductor switching element that is provided at a primary side of the transformer; a rectifying-and-smoothing circuit that is provided at a secondary side of the transformer; a switching controller configured to perform a switching control to turn on-and-off the semiconductor switching element, wherein the switching controller comprises: a stoppage circuit configured to perform a stoppage process to stop the switching control when a first-level control signal is input, a restart circuit configured to restart the switching control when a second-level control signal different in its level from the first-level control signal, and a limiting circuit configured to limit, at the time of a start-up of the switching power source, a performance of the stoppage process performed by the stoppage circuit until an output voltage of the switching power source increases to a target voltage. | 07-03-2014 |
20140212163 | POWER SOURCE APPARATUS AND IMAGE FORMING APPARATUS - A power source apparatus includes a transformer configured to output a voltage, a feedback unit configured to output a feedback signal based on the voltage output from the transformer, and a driving unit configured to drive the transformer according to a setting signal for setting the output voltage and the feedback signal. Whichever of a voltage of positive polarity and a voltage of negative polarity is output, the feedback unit controls the voltage output according to a value of a difference between the output voltage and a threshold value. | 07-31-2014 |
20140219676 | IMAGE FORMING APPARATUS - An image forming apparatus is disclosed that includes a power storage unit. The power storage unit includes a constant voltage generation part configured to generate a constant voltage from a commercial power supply, the constant voltage generation part being connected to an external apparatus operating by consuming power; a voltage increasing circuit configured to increase the constant voltage generated by the constant voltage generation part; a capacitor configured to store an electric charge supplied from the voltage increasing circuit; a circuit control part configured to control charging of the capacitor; and an output part configured to output power stored in the capacitor, the power having a voltage different from the constant voltage. | 08-07-2014 |
20140294423 | IMAGE FORMING APPARATUS AND POWER SUPPLY DEVICE - A power supply device includes a first switch section that can disconnect a 24-V power supply from a commercial alternating-current (AC) power supply and that operates with the voltage of 3.3 V, and a second switch section that can disconnect a voltage detection circuit from the commercial AC power supply and that operates with the voltage of 3.3 V. When a power saving mode is on, the 24-V power supply and the voltage detection circuit are disconnected from the commercial AC power supply by using the first and second switch sections, whereby the power supply device can be used in areas where different supply voltages are used, and at the same time reduction in power consumption in the power saving mode is achieved. | 10-02-2014 |
20140308051 | HEATING APPARATUS AND IMAGE FORMING APPARATUS - The heating apparatus includes a first detection part which detects whether or not the power supplied to the heat generation member is in an overpower state by detecting a positive phase of a half wave in an alternating voltage of a commercial power supply applied to the first or the second current path of the heat generation member, a second detection part which detects whether the power supplied to the heat generation member is in an overpower state or not by detecting a negative phase of a half wave in an alternating voltage the commercial power supply applied to the first current path or the second current path of the heat generation member, and a control part which controls itself to stop supplying power from the commercial power supply to the heat generation member in a case where an overpower state is detected by the first or second detection part. | 10-16-2014 |
20140341603 | SWITCHING CONTROL APPARATUS AND IMAGE FORMING APPARATUS - The switching control apparatus includes a switching driving unit for turning on and off the switch, a control-purpose power supply for outputting electric power, a power transmission unit provided between the switching driving unit and the control-purpose power supply, for supplying or cutting off electric power from the control-purpose power supply to the switching driving unit, and a control unit for controlling the power transmission unit. The control unit controls the switching driving unit to turn the switch on or off, during a period in which the electric power from the power supply to the switching driving unit is cut off by the power transmission unit, or supplied from the power supply to the switching driving unit. | 11-20-2014 |
20140341604 | IMAGE FORMING APPARATUS, CONTROL METHOD FOR IMAGE FORMING APPARATUS AND STORAGE MEDIUM - When a job is received via a LAN and if power for a controller unit is not turned on, a LAN controller of an image forming apparatus turns on a switch and performs an operation to turn on the power for the controller unit. If the power for the controller unit is not turned on even after the operation is performed or if the main switch is turned off, the LAN controller of the image forming apparatus notifies a job sender to connect AC power supply or turn on a main switch. | 11-20-2014 |
20140341605 | IMAGE FORMING APPARATUS, IMAGE FORMING SYSTEM, AND TRANSFER METHOD - An image forming apparatus includes a transfer unit configured to transfer a toner image onto a recording medium; a power supply unit configured to output one of an alternating-current-based voltage including at least an alternating-current voltage and a direct-current voltage to the transfer unit; and a power supply control unit configured to cause the power supply unit to start switching to the alternating-current-based voltage a first time after the power supply unit stops outputting the direct-current voltage in the case that output of the power supply unit is switched to the alternating-current-based voltage, and cause the power supply unit to start switching to the direct-current voltage a second time after the power supply unit stops outputting the alternating-current-based voltage in the case that output of the power supply unit is switched to the direct-current voltage. The second time is longer than the first time. | 11-20-2014 |
20140356013 | IMAGE FORMING APPARATUS AND ELECTRIC CHARGE ELIMINATING METHOD - An image forming apparatus includes a power supply portion, a driving portion, a detection portion, and a control portion. The power supply portion is connected to an external power supply and configured to generate a DC voltage. The driving portion is configured to drive with, as power, the DC voltage generated by the power supply portion. The detection portion is configured to detect a cut-off state of the external power supply with respect to the power supply portion. The control portion is configured to perform control so as to drive the driving portion when the cut-off state of the external power supply is detected by the detection portion. | 12-04-2014 |
20140363188 | IMAGE FORMING APPARATUS - An image forming apparatus includes two power cords ( | 12-11-2014 |
20140369709 | IMAGE FORMING APPARATUS AND FIXING UNIT ATTACHABLE TO IMAGE FORMING APPARATUS - The present invention provides an apparatus having a part of a current detecting circuit configured to detect current to a heater in a fixing unit so that a main body of the image forming apparatus may have one configuration for 100 V and 200 V and provides an equal resolution of current detection for an apparatus for 100 V and an apparatus for 200 V. | 12-18-2014 |
20150010319 | FIXING DEVICE AND IMAGE FORMING APPARATUS - A fixing device includes a heating body; first and second coils for induction heating that heat the heating body by an induction heating method; a first switching element connected to the first coil for induction heating; a second switching element connected to the second coil for induction heating; a driving signal transmission unit that sends a first drive signal to the first switching element and a second drive signal to the second switching element so that the first switching element and the second switching element operate at the same timing to apply a first input voltage to the first coil for induction heating and a second input voltage to the second coil for induction heating; and a voltage drop unit that steps down the first input voltage applied to the first coil for induction heating so that the first input voltage is lower than the second input voltage. | 01-08-2015 |
20150016835 | IMAGE FORMING APPARATUS - The power source board is arranged at a lower side on the back side of the main body of the image forming apparatus. The load control board is arranged at an upper side in a vertical direction of the power source board in such a manner that the load control board does not overlap with the power source board. For a board and load at a lower side when viewed from a load control board, a connector is arranged near the lower side of the load control board. For a board and load at an upper side of the load control board, a connector is arranged near the upper side of the load control board. Similarly, for boards and loads of right and left side, connectors are arranged near the respective right and left sides of the load control board. | 01-15-2015 |
20150055972 | POWER-SUPPLY DEVICE AND IMAGE FORMATION APPARATUS - A power-supply device includes: a rectifier circuit configured to output a rectified voltage by rectifying an output from a transformer; a comparator circuit configured to compare a comparison voltage corresponding to an output voltage or an output current that are generated based on the rectified voltage with the indicator voltage and to control an operation of the transformer drive circuit so as to reduce the difference between the comparison voltage and the indicator voltage; a constant voltage element configured to limit the output voltage or the output current by operating as a constant voltage source when the value of the output voltage or the output current reaches a threshold; and a current mirror circuit. The current mirror circuit is configured to lower the indicator voltage by allowing a current proportional to the current flowing through the constant voltage element to flow through the current path. | 02-26-2015 |
20150063855 | VOLTAGE GENERATING APPARATUS FOR STABLY CONTROLLING VOLTAGE - A negative bias circuit outputs a DC voltage of a negative polarity. A positive bias circuit outputs a DC voltage of a positive polarity. The DC voltage of the positive polarity is used, for example, as a transfer voltage, and the DC voltage of the negative polarity is used as a cleaning voltage for cleaning toner. A cycle of the clock signal in a period during which the DC voltage of the first polarity is output is longer than a cycle of the clock signal in the period during which the voltage supplied to the load transits from the DC voltage of the first polarity to the DC voltage of the first polarity. | 03-05-2015 |
20150117891 | POWER SUPPLY APPARATUS, IMAGE FORMING APPARATUS HAVING THE SAME, AND METHOD THEREOF - A power supply apparatus capable of outputting a predetermined voltage or a predetermined electrical current selectively is provided, including a voltage level setter to determine an output level of a voltage or an electrical current according to an external signal, a constant voltage feedback unit to correct an output value of the voltage level setter so as to output a constant voltage of the output level to a load terminal, a constant current feedback unit to maintain the external signal constantly and correct an output value of the voltage level setter so as to output a constant current of the output level to the load terminal, a switch to connect the voltage level setter with the constant voltage feedback unit or the constant current feedback unit selectively, and a controller to control the switch to output the constant voltage or the constant current selectively according to a state of the load terminal. | 04-30-2015 |
20150117892 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image bearing member for bearing a toner image; a belt for transferring the toner image from the image bearing member onto a transfer material; an electric power supplying device, contacted to the belt, to which a voltage is to be applied, wherein the electric power supplying device includes an erected fiber portion formed with a plurality of electroconductive erected fibers contacted to the belt; a power source; and a contact member, connected to the electric power supplying device, for applying the voltage from the power source to the electric power supplying device. The electric power supplying device includes a welded portion formed by heat aggregation of a part of the erected fiber portion, and the contact member is connected to the welded portion. | 04-30-2015 |
20150125174 | PRINTER, DATA PROCESSING APPARATUS, AND METHOD OF CONTROLLING DATA PROCESSING APPARATUS - A method of controlling a data processing apparatus including: a drive system device; a data processing device configured to perform data processing; and a power supply circuit configured to generate a drive system voltage to be supplied to the drive system device and a data processing system voltage to be supplied to the data processing device, from an input voltage from an external power supply. The method comprises: when an interruption of the input voltage is detected, switching an operation mode to a power saving mode in which the drive system device is stopped or restrained from driving, and then executing a protective operation for the data processing device. | 05-07-2015 |
20150147079 | IMAGE FORMING APPARATUS AND CHARGE CONTROL METHOD - An image forming apparatus includes a plurality of power generation units, a charge control unit, a charge switch unit, and a controller, Each of the plurality of power generation units is respectively provided to a corresponding one of a plurality of high-temperature portions in the image forming apparatus to generate power based on temperatures of the high-temperature portions. The charge control unit charges a power storage unit with electrical energy generated by the power generation units. The charge switch unit switches between the power generation units to connect one of the power generation units to the charge control unit. The controller controls the charge switch unit to selectively connect one of the power generation units capable of achieving a maximum power generation efficiency to the charge control unit. | 05-28-2015 |
20150147080 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS - The power supply apparatus includes a transformer having primary and secondary sides, a switching element, a feedback unit, a conversion unit that converts a current flowing in a primary winding of the transformer into a voltage, a control unit that controls operation of the switching element, a voltage switching unit that increases the voltage output from the conversion unit and feeds the increased voltage to the control unit when a continuous oscillation state is transited to an intermittent oscillation state. The voltage switching unit switches the voltage of the power supply that is input into the control unit to be higher when the continuous oscillation state is transited to the intermittent oscillation state. | 05-28-2015 |
20150323894 | IMAGE FORMING APPARATUS AND METHOD FOR CONTROLLING SAME, AND STORAGE MEDIUM - In an image forming apparatus to which a finisher is connected, a power source control unit shifts the image forming apparatus to a power saving state. The image forming apparatus is inhibited from being shifted to the power saving state when it is detected that a sheet for which a binding process is to be performed is set in the finisher. The image forming apparatus may be permitted to be shifted to the power saving state when it is not detected that the sheet is set in the finisher. | 11-12-2015 |
20150323895 | POWER SUPPLY APPARATUS FOR USE IN IMAGE FORMING APPARATUS - A setting unit sets a high-voltage set value. A first generation unit generates a high voltage based on the set value set by the setting unit and a first reference voltage supplied from a supply unit. A second generation unit generates a second reference voltage by being supplied with the first reference voltage from the supply unit. A comparing unit compares the first reference voltage with the second reference voltage. A storage unit stores a comparison result that has been obtained in advance by the comparing unit comparing the first reference voltage with the second reference voltage. A correction unit corrects the high-voltage set value based on a comparison result that is obtained by the comparing unit when the image forming apparatus is in use and the comparison result that has been obtained in advance and is stored in the storage unit. | 11-12-2015 |
20150346672 | IMAGE FORMING APPARATUS - An image forming apparatus includes: an image forming unit; a housing configured to store the image forming unit, the housing including an outer peripheral wall; a power supply unit disposed inside the housing; and a near field communication board including an antenna for near field communication, the near field communication board being disposed at a position of the outer peripheral wall apart from the power supply unit by a communicable distance or more. | 12-03-2015 |
20150355593 | TRANSFORMER, POWER SUPPLY, AND IMAGE FORMING APPARATUS - A transformer includes a core, a primary winding, a first secondary winding and a second secondary winding, a bobbin around which the primary winding, the first secondary winding, and the second secondary winding are wound, wherein the primary winding is disposed between the first secondary winding and the second secondary winding. | 12-10-2015 |
20150370216 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - An image forming apparatus includes a heat generator configured to generate heat in the image forming apparatus; a converter including a capacitor to convert AC power supplied from an external power supply into DC power for a load unit; a thermoelectric transducer configured to convert the generated heat into DC power for the load unit; a detector configured to detect a voltage of the AC power; and a controller configured to cause the converter to continue supplying the DC power to the load unit when a first elapsed time elapsed since the detected voltage drops below a rated voltage is shorter than a first time period shorter than an upper limit of a period of time over which the capacitor is dischargeable, and cause the thermoelectric transducer to supply the DC power to the load unit when the first elapsed time exceeds the first time period. | 12-24-2015 |
20160011552 | IMAGE FORMING APPARATUS, METHOD FOR CONTROLLING IMAGE FORMING APPARATUS, AND STORAGE MEDIUM | 01-14-2016 |
20160011558 | PRINTING SYSTEM INCLUDING PRINTING APPARATUS AND PRINTING CONTROL APPARATUS | 01-14-2016 |
20160033913 | IMAGE FORMING APPARATUS WITH FIRST AND SECOND POWER SUPPLY - An image forming apparatus includes a first power supply unit configured to generate first output power, a second power supply unit configured to generate second output power, a switching unit disposed on the primary side of the second power supply unit, a monitoring unit configured to monitor the second output power generated by the second power supply unit, a power source control unit supplied with the first output power, and configured to turn the switching unit ON or OFF, and a control unit supplied with the first output power, and configured to control operations of the power source control unit. When the second output power is lower than a threshold value, the power source control unit turns the switching unit OFF and then back to ON in a state where the first output power generated by the first power supply unit is supplied to the control unit. | 02-04-2016 |
20160041518 | TRANSFER DEVICE, IMAGE FORMING APPARATUS, AND POWER SUPPLY CONTROL METHOD - A transfer device includes a power supply control unit, a direct-current (DC) power supply, an alternating-current (AC) power supply, and a transfer unit. The power supply control unit controls a first control signal for controlling a DC voltage and a second control signal for controlling an AC voltage based on a condition relating to image formation. The DC power supply outputs the DC voltage based on the first control signal. The AC power supply selectively outputs, with a particular waveform, either of the DC voltage output from the DC power supply or a superimposed voltage obtained by superimposing the AC voltage determined based on the second control signal on the DC voltage output from the DC power supply. The transfer unit transfers a developer onto a sheet using a voltage output from the AC power supply. | 02-11-2016 |
20160054699 | INTERLOCK MECHANISM IN IMAGE FORMING APPARATUS AND ELECTRICAL DEVICE - An opening and closing portion is opened and closed. A switch is turned off when a voltage applied to a drive terminal is smaller than a first voltage and to be turned on when the voltage is greater than or equal to a second voltage. A drive unit generates a drive voltage. A first line applies the drive voltage to the switch. A second line is arranged such that at least a part thereof is near the first line. A voltage drop element provided on the first line drops a voltage applied from the second line through the first line to the drive terminal when the first line and the second line short-circuit in a state where the portion is open, to lower the voltage applied to the drive terminal to be smaller than the first voltage. | 02-25-2016 |
20160062302 | METHOD OF CONTROLLING IMAGE FORMING APPARATUS CONNECTED TO EXTERNAL DEVICE VIA EXTERNAL DEVICE INTERFACE UNIT AND IMAGE FORMING APPARATUS USING THE SAME - A method of controlling an image forming apparatus by driving a control unit by using power supplied from an external device via an external device interface unit, even when main power is not supplied to the image forming apparatus, and an image forming apparatus using the same is provided. | 03-03-2016 |
20160070222 | IMAGE FORMING APPARATUS, CONTROL METHOD THEREOF AND STORAGE MEDIUM - The distance between an image forming apparatus and an object located around the apparatus is detected, and the apparatus is returned from a power-saving state when the distance becomes shorter than a predetermined distance. Also, the image forming apparatus is returned from a power saving state, even if the distance is longer than the predetermined distance, in a case where the detected distance decreases for every predetermined time. | 03-10-2016 |
20160077475 | IMAGE FORMING APPARATUS, IMAGE FORMING METHOD, AND NON-TRANSITORY RECORDING MEDIUM - An image forming apparatus includes a fixing device to fix an image on a recording medium by heating the recording medium, multiple heat storing devices to store heat generated at the fixing device, an electric generating element to generate power by converting the heat into power, and a switch to switch connection and disconnection between the electric generating element and at least one of the multiple heat storing devices. | 03-17-2016 |
20160097994 | IMAGE FORMING APPARATUS - An image forming apparatus sequentially transfers toner images formed on a plurality of photosensitive drums onto an intermediate transfer member or a transfer material to form an image. The image forming apparatus includes an intermediate transfer belt provided with electrical conductivity, and a power supply for applying a voltage to a secondary transfer roller to pass a current from the secondary transfer roller to the plurality of photosensitive drums via the intermediate transfer belt, thus primarily transferring the toner images from the plurality of photosensitive drums onto the intermediate transfer belt. | 04-07-2016 |
20160116883 | POWER SUPPLY APPARATUS FOR SUPERIMPOSING DIRECT CURRENT VOLTAGE ON ALTERNATING CURRENT VOLTAGE AND OUTPUTTING RESULTING VOLTAGE - An alternating current generation circuit has a transformer and generates an alternating current voltage in accordance with a pulse signal input to the transformer. A clamp circuit has a constant-voltage element and a current limit element connected in series between the transformer, an output end of the alternating current voltage, and a ground. A direct current generation circuit generates a direct current voltage in accordance with a duty cycle of the input pulse signal. The direct current generation circuit converts, into a direct current voltage, a current that flows from the clamp circuit via the ground, and superimposes the direct current voltage on the alternating current voltage, and a voltage obtained by superimposing the direct current voltage on the alternating current voltage is output from the output end. | 04-28-2016 |
20160124373 | IMAGE FORMING APPARATUS - An image forming apparatus includes a voltage application unit, a target device, a voltage application line, and an electric-current return line. The voltage application unit applies a voltage to the target device through the voltage application line made of a conductor. The electric-current return line made of a conductor connects the target device to the voltage application unit. An electric current that flows upon application of the voltage from the voltage application unit to the target device returns to the voltage application unit through the electric-current return line. The electric-current return line has a length shorter than a path by way of the casing of the image forming apparatus. | 05-05-2016 |
20160127593 | IMAGE FORMING APPARATUS AND METHOD OF STARTING UP MODULES IN THE IMAGE FORMING APPARATUS - An image forming apparatus is provided. The image forming apparatus includes an electric power supply, a plurality of modules, a startup time calculator, and a fastest startup pattern determiner. The plurality of modules include a plurality of direct current (DC) modules and at least one alternating current (AC) module, and the modules are to be driven by an electric power supplied from the electric power supply. The startup time calculator calculates a startup time of each of the modules. The fastest startup pattern determiner determines a fastest startup pattern based on the startup time of each of the modules calculated by the startup time calculator, and starts up the modules in accordance with the determined fastest startup pattern. The fastest startup pattern is determined based on a longest startup time among the startup times of the DC and AC modules. | 05-05-2016 |
20160187825 | IMAGE FORMING APPARATUS - An arrangement structure of a main power switch includes an apparatus body, the main power switch, and a movable member. The apparatus body has a dead space on a front side. The main power switch is disposed in the dead space. The movable member is disposed in the apparatus body to cover the main power switch. The movable member is drawable from the apparatus body in a horizontal direction. The movable member includes an opening opposed to the main power switch, to expose the main power switch to outside. | 06-30-2016 |
20160187834 | Image Forming Apparatus That Prevents Occurrence of Failure in Association with Temperature Rise of Circuit Board - An image forming apparatus includes an apparatus main body, a paper sheet feeder, an image forming circuit, a paper sheet discharge unit, and a high voltage circuit board. The paper sheet feeder is located in the apparatus main body to feed a sheet. The image forming circuit is located in the apparatus main body to form an image on the sheet fed by the paper sheet feeder. The image formed sheet with is discharged to the paper sheet discharge unit. The high voltage circuit board is located along a horizontal direction over the image forming circuit in the apparatus main body to supply a high voltage to the image forming circuit. | 06-30-2016 |
20160202650 | IMAGE FORMING APPARATUS | 07-14-2016 |
20160202656 | Image Forming Apparatus Having Cartridges | 07-14-2016 |
20160378051 | POWER SUPPLY UNIT AND IMAGE FORMING APPARATUS - Provided is a power supply unit that includes a power factor correction circuit, a synchronizing signal generator, an alternating-current signal generator. The power factor correction circuit is configured to generate, based on a first alternating-current signal, a direct-current signal. The synchronizing signal generator is configured to generate, based on the first alternating-current signal, a synchronizing signal that is in synchronization with the first alternating-current signal. The alternating-current signal generator includes a switching section, and is configured to generate, based on the direct-current signal, a second alternating-current signal. The switching section is configured to perform, based on the synchronizing signal, a switching operation. The second alternating-current signal has a variable effective voltage value. | 12-29-2016 |
20160378052 | POWER SUPPLY UNIT AND IMAGE FORMING APPARATUS - Provided is a power supply unit that includes a switching section and a controller. The switching section is configured to perform a switching operation and thereby generate, based on an input signal, a first alternating-current signal. The controller is configured to control the switching operation and thereby perform an amplitude control that involves increasing, based on an input current in the switching section, a signal amplitude of the first alternating-current signal. | 12-29-2016 |
20170235271 | IMAGE FORMING APPARATUS, METHOD FOR CONTROLLING IMAGE FORMING APPARATUS, AND NON-TRANSITORY COMPUTER READABLE MEDIUM | 08-17-2017 |
20190146402 | IMAGE FORMATION DEVICE AND METHOD FOR STARTING IMAGE FORMATION DEVICE | 05-16-2019 |
20190149054 | POWER SUPPLY APPARATUS AND IMAGE FORMING APPARATUS | 05-16-2019 |