Abstract: 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.

Abstract: An image forming apparatus includes: a developer-image carrier; a conveyance belt that contacts the developer-image carrier and conveys a developer image; and a transfer member contacting the conveyance belt from an opposite side of the developer-image carrier to transfer the developer image onto the conveyance belt. The transfer member includes a main roller body and a movable member including a first end portion fixed to a circumferential surface of the main roller body and a second end portion extending outward in a radial direction of the main oiler body and movable with respect to the first end portion. A rotation axis line of the main roller body is provided downstream of the rotation axis line of the developer-image carrier in a movement direction of the conveyance belt such that the main roller body contacts the developer-image carrier while interposing the conveyance belt therebetween.

Abstract: An LED drive circuit that drives an LED is provided with: a rectifying circuit that converts an alternating voltage into a pulsating current; a constant current circuit; and an over-temperature protection portion that limits an output of the constant current circuit, wherein the LED and the constant current circuit are connected in series on an output side of the rectifying circuit.

Abstract: A support frame portion is divided into a first support-frame half-portion and a second support-frame half-portion along a virtual reference dividing plane. A raised portion is integrally formed with each of side walls in a pair of the first web half-portion, projecting toward the second web half-portion beyond the virtual reference dividing plane. A raised portion is integrally formed with each of side walls in a pair of the second web half-portion, projecting toward the first web half-portion beyond the virtual reference dividing plane. A recessed portion is formed in each of the side walls in the pair of the first web half-portion, and is fitted with the raised portion corresponding thereto of the second web half-portion. A recessed portion is formed in each of the side walls in the pair of the second web half-portion, and is fitted with the raised portion corresponding thereto of the first web half-portion.

Abstract: A developer supply device is provided, which includes a transfer board including an activating section and an always-transferring section. The activating section is disposed in a position close to a developer holding member and lower than a position where development agent is transferred onto the developer holding member. The activating section is supplied with an activating voltage for making the development agent leave a developer transfer path and drop into the developer storage section during an activating process performed at an initial stage of a developer transferring operation while supplied with the transfer bias voltage after the activating process. The always-transferring section is disposed across a position facing the developer storage section to a position lower than and adjacent to the activating section, and always supplied with a transfer bias voltage during the developer transferring operation.

Abstract: There is provided an image formation device comprising an developer holding body having a holding surface parallel with a main scanning direction and holding thereon developer; an developer supplying unit to carry developer along a carrying path, wherein the developer supplying unit comprises first carrying electrodes arranged along the carrying path and serving to carry the developer in a carrying direction; second carrying electrodes arranged along the carrying path to face the first electrodes and serving to carry the developer in the carrying direction; a first voltage applying unit to apply a first carrying voltage having a first frequency to the first carrying electrodes; and a second voltage applying unit to apply, to the second carrying electrodes, a second carrying voltage having a second frequency different from the first frequency.

Abstract: A fixing device for thermally fixing a developing agent image to a sheet includes: a tubular flexible fusing member; a heater; a nip member; and a backup member. The tubular flexible fusing member has an inner peripheral surface defining an internal space. The heater is disposed in the internal space and radiates radiant heat. The nip member is disposed in the internal space and receives the radiant heat from the heater. The inner peripheral surface is in sliding contact with the nip member. The backup member provides a nip region in cooperation with the fusing member upon nipping the fusing member between the backup member and the nip member. The nip member has a surface confronting the heater. The surface includes a first heat absorption region having a first heat absorption ratio of a predetermined value and a second heat absorption region having a second heat absorption ratio higher than the first heat absorption ratio.

Abstract: 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.

Abstract: An LED drive circuit in which an alternating voltage is input and an LED is driven, and which is capable of connecting to a phase control dimmer. The LED circuit is provided with a current extractor for extracting a current from a power supply feed line for feeding an LED drive current to the LED; and an extraction timing adjuster for operating the current extractor for a predetermined period of time after the start of a voltage fluctuation in the power supply feed line, the voltage fluctuation accompanying output oscillation of the phase control dimmer.

Abstract: A developer supply apparatus is provided which supplies a toner to a supply object, the developer supply apparatus including a developer storage body which stores a powdery developer, and a transfer body which transfers the developer along the developer transfer path with traveling wave electric fields. The developer includes a toner having a predetermined charging characteristic and an electric neutralizer having an opposite charging characteristic, which is opposite to the predetermined charging characteristic.

Abstract: A counter-rotating axial-flow fan is provided that is capable of increasing effect of cooling a stator. One or more through-holes 83 penetrating support frame bodies (21, 75) in the axial direction are formed in support frame bodies 21 and 75. One or more vent holes 57a for introducing air, sucked from a suction port 19, into a cup-like member 51 are formed in a bottom wall portion 57 of a cup-like member 51 of a first impeller 9. One or more vent holes 111a for discharging air, introduced into an internal space of a second motor 61, to the outside are formed in a bottom wall portion 111 of a cup-like member 105 of a second impeller 63.

Abstract: An LED drive circuit receives an alternating-current voltage and drives an LED. The LED drive circuit has a current extractor which extracts a current from the current supply line through which an LED drive current is supplied to the LED, and a timing adjuster which adjusts the current extraction start timing and the current extraction duration in the current extractor.

Abstract: 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.

Abstract: A counter-rotating axial-flow fan is provided that is capable of increasing effect of cooling a stator. One or more through-holes 83 penetrating support frame bodies (21, 75) in the axial direction are formed in support frame bodies 21 and 75. One or more vent holes 57a for introducing air, sucked from a suction port 19, into a cup-like member 51 are formed in a bottom wall portion 57 of a cup-like member 51 of a first impeller 9. One or more vent holes 111a for discharging air, introduced into an internal space of a second motor 61, to the outside are formed in a bottom wall portion 111 of a cup-like member 105 of a second impeller 63.

Abstract: An LED drive circuit that drives an LED is provided with: a rectifying circuit that converts an alternating voltage into a pulsating current; a constant current circuit; and an over-temperature protection portion that limits an output of the constant current circuit, wherein the LED and the constant current circuit are connected in series on an output side of the rectifying circuit.

Abstract: There is provided an image formation device comprising an developer holding body having a holding surface parallel with a main scanning direction and holding thereon developer; an developer supplying unit to carry developer along a carrying path, wherein the developer supplying unit comprises first carrying electrodes arranged along the carrying path and serving to carry the developer in a carrying direction; second carrying electrodes arranged along the carrying path to face the first electrodes and serving to carry the developer in the carrying direction; a first voltage applying unit to apply a first carrying voltage having a first frequency to the first carrying electrodes; and a second voltage applying unit to apply, to the second carrying electrodes, a second carrying voltage having a second frequency different from the first frequency.

Abstract: An LED drive circuit includes a constant-current circuit that supplies a constant-current to an LED module to drive it; a thyristor; and a phase-angle control circuit which adjusts the ignition angle of the thyristor. The LED module, the constant-current circuit, and the thyristor are connected in series.

Abstract: The invention provides a pulse modulation photodetector, which detects, by projecting pulsed light, presence or absence of a physical object based on whether the pulsed light is received or not according to passage of the physical object. The pulsed light has a pulse width modulated according to a light emission pulse, which is generated based on a clock pulse signal and has a modulation cycle. The modulation cycle includes a light emission period during which the light emission pulse is present, and a non light emission period other than the light emission period. Further, the clock pulse signal has a pulse width being shorter in the light emission period than in the non light emission period.

Abstract: A support frame portion is divided into a first support-frame half-portion and a second support-frame half-portion along a virtual reference dividing plane. A raised portion is integrally formed with each of side walls in a pair of the first web half-portion, projecting toward the second web half-portion beyond the virtual reference dividing plane. A raised portion is integrally formed with each of side walls in a pair of the second web half-portion, projecting toward the first web half-portion beyond the virtual reference dividing plane. A recessed portion is formed in each of the side walls in the pair of the first web half-portion, and is fitted with the raised portion corresponding thereto of the second web half-portion. A recessed portion is formed in each of the side walls in the pair of the second web half-portion, and is fitted with the raised portion corresponding thereto of the first web half-portion.