Patent application number | Description | Published |
20110156612 | LED DRIVE CIRCUIT, PHASE CONTROL DIMMER, LED ILLUMINATION FIXTURE, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM - An LED drive circuit for driving an LED by input of an alternating voltage, the LED drive circuit being capable of connecting to a phase control dimmer. The LED drive circuit is provided with a current extractor for continuing to allow current to flow into the phase control dimmer so that a phase control element inside the phase control dimmer does not switch off before the alternating voltage reaches 0 V after the phase control element inside the phase control dimmer switches on and the LED emits light. | 06-30-2011 |
20110193488 | LED DRIVE CIRCUIT, DIMMING DEVICE, LED ILLUMINATION FIXTURE, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM - An LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven. The LED drive circuit comprises a phase angle detector for detecting the phase angle at which a phase control element inside the phase control dimmer switches from off to on; a switching power supply for feeding a current to the LED; a switching element connected in series to the LED; and a controller for controlling the switching power supply and the switching element in accordance with the output of the phase angle detector; wherein the controller places the switching element in an always-on state in a case in which the phase angle detected by the phase angle detector is equal to or less than a predetermined value, and the controller pulse-drives the switching element in a case in which the phase angle detected by the phase angle detector is greater than the predetermined value. | 08-11-2011 |
20130134895 | LED DRIVE CIRCUIT AND LED ILLUMINATION UNIT - There is provided an LED drive circuit that can be connected to an alternating-current power supply through a phase control dimmer and that drives an LED load, the LED drive circuit including: an LED current control circuit; a capacitance component and a resistance component that are connected in series between an input of the LED current control circuit and a reference potential; a switch element that is connected to both ends of the resistance component; and a switch control portion that turns off the switch element for a given period of time after a timing when the phase control dimmer is turned on and that turns on the switch element after the given period of time elapses. | 05-30-2013 |
Patent application number | Description | Published |
20100090604 | LED DRIVE CIRCUIT, LED ILLUMINATION COMPONENT, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM - An LED drive circuit is an LED dive circuit that receives an alternating voltage to drive an LED, and includes a current remove portion that removes a current from a current supply line that supplies an LED drive current to the LED. If an input current to the LED drive circuit is an unnecessary current, the LED does not light because of current removal by the current remove portion. If the input current to the LED drive circuit turns into the LED drive current from the unnecessary current, the current remove portion decreases the amount of current removed. | 04-15-2010 |
20110234115 | LED DRIVE CIRCUIT, LED ILLUMINATION FIXTURE, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM - An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer The LED drive circuit is provided with an edge detector for detecting an edge of the output voltage of the phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to the LED; wherein the value of the current extracted from the current feed line by the current extractor is varied in accordance with the detection results of the edge detector. | 09-29-2011 |
20120043902 | LED DRIVER CIRCUIT AND LED LIGHTING DEVICE USING THE SAME - Provided is an LED driver circuit, to be connected to an AC power supply via a phase-control dimmer, for driving an LED load, including: a switching power supply part including a switching element and a switching current detection part; an LED current detection part; a first control part for controlling and switching the switching element so that a switching current has a desired current value based on a detection signal of the switching current detection part; a second control part for controlling and switching the switching element so that an LED current has a desired current value based on a detection signal of the LED current detection part; and a switch part for switching between control performed by the first control part when the phase-control dimmer is set to high brightness dimming and control performed by the second control part when the phase-control dimmer is set to low brightness dimming. | 02-23-2012 |
20120126708 | LED DRIVE CIRCUIT AND LED ILLUMINATION APPARATUS - An LED drive circuit that is connectable to a phase control type of light adjuster and receives a voltage based on an a.c. voltage to drive an LED load, the LED drive circuit has a structure which includes:
| 05-24-2012 |
20120217900 | LED DRIVING CIRCUIT, LED ILLUMINATION APPLIANCE, LED ILLUMINATOR, AND LED ILLUMINATION SYSTEM - Provided is an LED driving circuit ( | 08-30-2012 |
20120274230 | LED DRIVE CIRCUIT AND LED ILLUMINATION LIGHT - An LED drive circuit that is connectable to an a.c. power supply via a phase control type light adjuster and drives an LED load, including a discharge portion that consumes energy of a resonance phenomenon generated by a light adjuster capacitance component of the phase control type light adjuster and a light adjuster inductance component of the phase control type light adjuster when a current holding portion of the phase control type light adjuster is turned on. | 11-01-2012 |
20130026946 | LED DRIVE CIRCUIT, LED ILLUMINATION COMPONENT, LED ILLUMINATION DEVICE, AND LED ILLUMINATION SYSTEM - An LED drive circuit is an LED dive circuit that receives an alternating voltage to drive an LED, and includes a current remove portion that removes a current from a current supply line that supplies an LED drive current to the LED. If an input current to the LED drive circuit is an unnecessary current, the LED does not light because of current removal by the current remove portion. If the input current to the LED drive circuit turns into the LED drive current from the unnecessary current, the current remove portion decreases the amount of current removed. | 01-31-2013 |
20130076248 | LED DRIVE CIRCUIT AND LED ILLUMINATION APPARATUS USING THE SAME - An LED drive circuit which is connectable to a phase control type light adjuster, including:
| 03-28-2013 |
Patent application number | Description | Published |
20130251393 | CHARGING DEVICE, IMAGE FORMING STRUCTURE, AND IMAGE FORMING APPARATUS - A charging device includes a charging member that includes a rotating shaft and charges a surface of a charging object while rotating in contact with the charging object, a cleaning member that includes a rotating shaft and removes unwanted matter from a surface of the charging member while rotating in contact with the charging member, and a bearing member that includes first and second receiving portions each having an open part on one side thereof and a substantially concave-shaped bottom on another side thereof. The first and second receiving portions receive circumferences of the rotating shafts of the charging member and the cleaning member, respectively, at the bottoms thereof. The open parts of the first receiving portion and the second receiving portion face respectively different directions. A part of an inner surface of the second receiving portion forms a part of an outer surface of the first receiving portion. | 09-26-2013 |
20130251400 | IMAGE FORMING APPARATUS, PROCESS CARTRIDGE, AND IMAGE FORMING METHOD - An image forming apparatus includes a drive source that generates a driving force, an image forming object on which an electrostatic latent image is to be formed and that includes a rotatable shaft extending therethrough and rotates with the driving force that is input to one end of the rotatable shaft, and an extracting member that is provided at another end of the rotatable shaft of the image forming object and extracts, from the rotatable shaft, a driving force to be transmitted to a driven member excluding the image forming object. | 09-26-2013 |
20140064789 | IMAGE FORMING APPARATUS AND TRANSPORT DEVICE - Disclosed is an image forming apparatus including an image forming apparatus member, a toner image forming unit including a housing that accommodates at least one of a toner image retainer to retain a toner image and a toner retainer to supply a toner to the toner image retainer, and a recording medium transport unit including a transport belt, having an endless shape, that is openably and closably mounted to the image forming apparatus member and transports a recording medium with being wound between a pair of support rollers provided along a transport direction of the recording medium, and a regulation member that faces the transport belt to regulate a posture of the recording medium, wherein when the recording medium transport unit is closed with respect to the image forming apparatus member, the regulation member is positioned to come into contact with the housing. | 03-06-2014 |