Patent application number | Description | Published |
20090212878 | Oven-controlled crystal oscillator - An oven-controlled crystal oscillator includes a circuit board, a crystal unit surface-mounted on the circuit board, and a temperature control circuit that maintains operating temperature of the crystal unit constant. The temperature control circuit includes a heating resistor, a power transistor that supplies power to a heating resistor, and a temperature sensitive resistor that detects temperature of the crystal unit. The heating resistor is formed, as a film resistor, on a surface of the circuit board in an area thereof in which the crystal unit is located. The temperature sensitive resistor is provided on the circuit board as a film resistor. | 08-27-2009 |
20100033258 | Secondary vibration damping type crystal oscillator circuit - A secondary vibration damping type crystal oscillator circuit is formed as a Colpitts type, in which a crystal unit is connected between base and collector terminals, a first capacitor is connected between emitter and collector terminals, and a second capacitor is connected between emitter and base terminals of a oscillating transistor. A region between the emitter and collector terminals or between the emitter and base terminals includes a reactance parallel circuit, in which an LC series circuit is connected in parallel to the first or second capacitor. The reactance parallel circuit has resonant characteristics that the reactance parallel circuit is made capacitive at an oscillating frequency in principal vibration mode of the crystal unit as an oscillating frequency, and a resonant frequency of the LC series circuit corresponds to the vibrational frequency in secondary vibration mode that is close to the principal vibration mode. | 02-11-2010 |
20100102892 | CRYSTAL OSCILLATOR - A crystal oscillator includes a crystal unit and a voltage-variable capacitive element that is connected to the crystal unit in series, the crystal oscillator varying an oscillation frequency by applying a control voltage between terminals of the voltage-variable capacitive element and by varying a series equivalence capacitance at a side of the oscillator circuit when observed between terminals of the crystal unit. The crystal oscillator further includes a first resistor and a second resistor for dividing the control voltage. At least one of the first resistor and the second resistor is a temperature sensing resistor, the resistance of which changes depending on a temperature, so as to correct frequency temperature characteristics of the oscillation frequency. | 04-29-2010 |
20100231309 | CONSTANT-TEMPERATURE TYPE CRYSTAL OSCILLATOR - A constant-temperature type crystal oscillator includes: a surface-mount crystal unit, in which a crystal element is housed in a case main body to hermetically encapsulate the crystal element with a metal cover, and which includes a crystal terminal serving as a mounting terminal that is electrically connected to at least the crystal element on an outer bottom face of the case main body; a thermistor that detects an operational temperature of the surface-mount crystal unit; and a circuit substrate, on which elements forming an oscillator circuit and elements forming a temperature control circuit along with the thermistor are installed. The thermistor includes a first and second terminal electrode and a temperature detecting electrode that is electrically independent of the first and second terminal electrode. The temperature detecting electrode is electrically connected to the crystal terminal of the surface-mount crystal unit through a circuit pattern formed on the circuit substrate. | 09-16-2010 |
20120292300 | TEMPERATURE CONTROL CIRCUIT OF OVEN CONTROLLED CRYSTAL OSCILLATOR - A temperature control circuit of an oven controlled crystal oscillator (OCXO) is provided. A first and a second digital potentiometer are correspondingly arranged in a bridge circuit which outputs a voltage to an input terminal of a differential amplifier (OPAMP), wherein the resistance value of the first digital potentiometer is adjustable so as to adjust the temperature of the oven to the peak temperature of the crystal resonator, and the resistance value of the second digital potentiometer is adjustable so as to cancel the temperature gradient of the first digital potentiometer. In the temperature control circuit of OCXO, the heat generation of the heater resistor is controlled by the power transistor based on the control voltage from the differential amplifier. | 11-22-2012 |
20130008883 | TEMPERATURE CONTROL CIRCUIT OF OVEN-CONTROLLED CRYSTAL OSCILLATOR - A temperature control circuit of oven-controlled crystal oscillator includes a heater resistor, a first resistor, a thermistor, a second resistor, a third resistor, a differential amplifier, a PNP-type power transistor, and a PNP-type current-limiting transistor. The thermistor outputs a voltage depending on a temperature. The differential amplifier amplifies a difference between the voltage received by the one input terminal and the voltage received by the other and output as a control voltage. The PNP-type power transistor includes an emitter where the other end of the heater resistor is connected, a base that receives an output of the differential amplifier, and a grounded collector. The PNP-type current-limiting transistor has an emitter where a power voltage is supplied, a base that receives a voltage between the other end of the heater resistor and the emitter of the power transistor, and a collector connected to the base of the power transistor. | 01-10-2013 |
20130249641 | OSCILLATOR CIRCUIT - The oscillator circuit | 09-26-2013 |
20150084705 | TEMPERATURE CONTROL CIRCUIT AND OVEN CONTROLLED CRYSTAL OSCILLATOR - A temperature control circuit of an oven controlled crystal oscillator is a circuit in which a supply voltage is applied to a first terminal of a resistance R | 03-26-2015 |
Patent application number | Description | Published |
20090244246 | INKJET PRINTER AND A PAPER TRANSPORTATION METHOD - An inkjet printer prevents the paper from lifting away from the platen when the suction action of the platen is stopped, and thereby prevents paper jams and other printing problems. The printer | 10-01-2009 |
20100032466 | LABEL PAPER INDEXING CONTROL METHOD AND LABEL PRINTER - A label paper indexing control method for a label printer, including steps of conveying label paper having labels affixed with a specific gap there between to a continuous liner through a paper transportation path passed a printing position of a print head, detecting a reference position of the label paper at a detection position upstream from the print head, determining the position of a downstream label end of a label on the paper transportation path as a first distance from the detection position based on when the reference position is detected, updating the first distance each time the label paper is conveyed, executing a power shutdown operation that writes the first distance to nonvolatile memory and turns the power off when a power off command instructing turning the power off is asserted, and reading the first distance from nonvolatile memory when the power turns on without the label paper having been replaced. | 02-11-2010 |
20100033752 | PRINTER CONTROL METHOD AND A PRINTER - A printer and reprinting control method do not reprint when an error accompanied by no damage to the actual printing area or print image on paper occurs so that consumables are not wasted. The printer | 02-11-2010 |
20110182594 | IMAGE FORMING DEVICE WITH MOUNTED REPLACEABLE UNIT, METHOD OF CHECKING OPERATION IN THAT IMAGE FORMING DEVICE, AND STORAGE MEDIUM STORING OPERATION CHECKING PROGRAM DIRECTED TO THAT IMAGE FORMING DEVICE - When a unit containing a fuse is mounted, in response to detection of a potential indicating that the fuse has not been blown by a detection circuit, a current for blowing the fuse is supplied from a blowing circuit to the mounted unit containing the fuse, and operation of the blowing circuit is checked based on potentials detected by the detection circuit before current supply and after current supply, respectively. When a unit containing a non-blown component instead of a fuse is mounted, a current is supplied from the blowing circuit to the mounted unit containing the non-blown component, and operation of the blowing circuit is checked based on potentials detected by the detection circuit before current supply and during current supply, respectively, or potentials detected by the detection circuit before current supply and after current supply, respectively. | 07-28-2011 |
20130077985 | IMAGE FORMING APPARATUS - An image forming apparatus having; image supporting members provided for a plurality of colors; chargers to be impressed with charging biases to charge the respective image supporting members; developing devices to be impressed with developing biases to develop latent images formed on the image supporting members; a charging bias power supply, including high-voltage DC power supply circuits and an AC power supply circuit, for applying the charging biases, which are generated by superposition of direct-current voltages and an alternate-current voltage, to the chargers; and a control circuit that performs stop processing to stop applications of the charging biases and the developing biases. The control circuit performs processing to attenuate each of the direct-current voltages and each of the developing biases, and after all the direct-current voltages have become a predetermined stop potential, the control circuit performs processing to stop the outputs of the direct-current voltages and the alternate-current voltage. | 03-28-2013 |
20130084091 | IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD - An image forming apparatus for fixing a toner image to a recording sheet by transporting the recording sheet through a fixing nip formed by a heating rotating body and a pressing rotating body that press against each other. The image forming apparatus includes an idle rotation unit that causes idle rotation of the heating rotating body and the pressing rotating body during a standby state of the image forming apparatus, a cumulative amount recording unit that measures an amount of the idle rotation and record a cumulative amount of the idle rotation, and a prohibiting unit that prohibits the idle rotation unit from causing the idle rotation when the cumulative amount reaches a predetermined allowable value. | 04-04-2013 |
20130176588 | PRINTER CONTROL METHOD AND A PRINTER - A printer and reprinting control method do not reprint when an error accompanied by no damage to the actual printing area or print image on paper occurs so that consumables are not wasted. The printer reprints the label on which the print image was being formed when a specific error occurs if the error occurred while the inkjet head was forming the print image in the actual printing area of the label. When the non-printing area of the label is passing the printing position of the inkjet head, the print image in the actual printing area that was printed immediately before an error occurs is reprinted only if a specific error is detected, such as a paper jam error or mechanical error with the possibility of damage to the paper or label. | 07-11-2013 |
20140147154 | SYSTEM-SPEED SWITCHABLE IMAGE FORMING DEVICE - An image forming device switches a system speed when assignment of a license has been accepted, and stores switching information of the system speed. The image forming device performs two-stage image stabilization for determining a setting value of a parameter relating to an image formation process of the image forming device when the switching information of the system speed is stored, and performs single-stage image stabilization for determining a setting value of the parameter relating to the image formation process of the image forming device when the switching information of the system speed is not stored. | 05-29-2014 |