Abstract: In test modes correcting at least one of an exposure timing of a first exposure portion and an exposure timing of a second exposure portion after transferring test toner images on an endless belt, a control portion is configured to be able to start the exposure of the first exposure portion after when a position of an intermediate transfer belt located at a second developing bias when a developing bias is started to be applied to the second developing portion.

Abstract: A center frame is fastened to a first bracket and a second bracket such that a first mated protrusion and a second mated protrusion are fitted together with a first mated recess portion and a second mated recess portion so as to be mated. O rings are disposed annularly so as to be held between an end surface of the first bracket and a first axial end surface of the center frame, and between an end surface of the second bracket and a second axial end surface of the center frame on an opposite side from outer circumferential inner wall surfaces of the first mated recess portion and the second mated recess portion.

Abstract: An image forming apparatus is provided that reduces main scanning jitter with a simple configuration and performs light amount control with high accuracy. The image forming apparatus includes: a laser emitting luminous flux; a main-scanning aperture portion shaping the luminous flux; a beam splitter splitting the luminous flux passed through the main-scanning aperture portion into a reflected beam and a transmitted beam; a rotary polygon mirror deflecting the transmitted beam so that the transmitted beam scans the surface of a photosensitive drum; and an optical box in which the laser, the main-scanning aperture portion, the beam splitter and the rotary polygon mirror are disposed. The main-scanning aperture portion is disposed so as not to block a deflected and transmitted beam. The beam splitter abuts against the main-scanning aperture portion so as not to block a deflected and transmitted beam deflected, and is positioned by abutting against the main-scanning aperture portion.

Abstract: Provided is a vehicle AC generator for improving working efficiency in assembly, allowing a reduction in the number of components, and the like. The vehicle AC generator includes: a rectifier for rectifying an AC generated by a stator coil into a DC; and a regulator for regulating an AC voltage generated by the stator coil, in which: the regulator includes: a regulator holder; a regulator main body provided inside the regulator holder, the regulator main body being for regulating the AC voltage; a capacitor provided inside the regulator holder, the capacitor being for absorbing a noise generated when the AC is rectified into the DC by the rectifier; and an insulating resin material filling the regulator holder so as to fix the regulator main body and the capacitor.

Abstract: A scanning optical device includes a rotating polygonal mirror having a plurality of reflecting faces. A first light source emits a first light beam from one section obtained by sectioning the scanning optical device with a plane passing through the rotation axis of the rotating polygonal mirror. A second light source emits a second light beam from the other section. The first calculation unit calculates scan time of the first light source. The second calculation unit calculates scan time of the second light source. The jitter correction unit corrects jitter by controlling a pixel clock supplied to the first light source according to the scan time of the second light source. The jitter correction unit also corrects jitter by controlling a pixel clock supplied to the second light source according to the scan time of the first light source.

Abstract: A center frame is fastened to a first bracket and a second bracket such that a first mated protrusion and a second mated protrusion are fitted together with a first mated recess portion and a second mated recess portion so as to be mated. O rings are disposed annularly so as to be held between an end surface of the first bracket and a first axial end surface of the center frame, and between an end surface of the second bracket and a second axial end surface of the center frame on an opposite side from outer circumferential inner wall surfaces of the first mated recess portion and the second mated recess portion.

Abstract: A lighting device of a discharge lamp, the lighting device includes: a DC voltage generating circuit including: a switching element that is controlled by a first controlling signal; and a coil that has one end portion, to which a first DC voltage is input, and the other end portion of the coil outputs a second DC voltage, and an AC voltage generating circuit that converts into an AC voltage and supplies to the discharge lamp; and a control circuit unit, which receives a polarity-inversion instructing signal, which generates a second controlling signal to determine a timing of polarity-inversion after a predetermined first period is elapsed, which sets a latest ON period, wherein the latest ON period is set based on both an elapsed time and the duty ratio, and which generates the first controlling signal to restart the ON/OFF control at a timing after a second period is elapsed.

Abstract: Provided is a vehicle AC generator for improving working efficiency in assembly, allowing a reduction in the number of components, and the like. The vehicle AC generator includes: a rectifier for rectifying an AC generated by a stator coil into a DC; and a regulator for regulating an AC voltage generated by the stator coil, in which: the regulator includes: a regulator holder; a regulator main body provided inside the regulator holder, the regulator main body being for regulating the AC voltage; a capacitor provided inside the regulator holder, the capacitor being for absorbing a noise generated when the AC is rectified into the DC by the rectifier; and an insulating resin material filling the regulator holder so as to fix the regulator main body and the capacitor.

Abstract: The present invention relates to an image forming apparatus comprising: a plurality of image forming means; a first image forming means; a second image forming means; a belt member to be transferred with the toner image formed on each image forming means; and a plurality of suspending members, wherein said plurality of image forming means are arranged so as to face to a first belt surface between the suspending members; the first and second image forming means are arranged so as to face to a second belt surface different from the first belt surface; and a distance, between adjacent contact portions of the image forming means on the second belt surface side and said second belt surface, is greater than a distance, between adjacent contact portions of the image forming means on the first belt surface side and said first belt surface.

Abstract: An original feeding apparatus is located above an image forming portion for recording an image on a recording medium and is constructed to convey an original to an image reading portion slidable in a shift direction relative to the image forming portion. The original feeding apparatus is slidable integrally with the image reading portion relative to the image forming portion and has its barycenter located on the rear end side with respect to the center in the shift direction.

Abstract: The image forming apparatus comprises: a first photosensitive drum; a second photosensitive drum; deflective scanning means for deflecting a laser beam and scanning by rotation; first laser irradiation means including a plurality of light emitting sources of laser beam for irradiating the first photosensitive drum, to irradiate the deflective scanning means with the laser; second laser irradiation means including a plurality of light emitting sources of laser for irradiating the second photosensitive drum, to irradiate the deflective scanning means with the laser beams; supporting means for supporting the first laser irradiation means and the second laser irradiation means; and a rotation supporting member for rotationally moving the first laser irradiation means, the second laser irradiation means and the supporting means integrally with respect to an axis generally parallel to the emanating axis of the laser beam to be emitted from the first laser irradiation means.

Abstract: An electrophotographic image forming apparatus senses amounts of color misregistration of toner images, which are formed using n-number (where n is a natural number and n=2 holds) of photosensitive bodies, when light beams from a plurality of light sources are made to deflect and scan across the n-number of photosensitive bodies by a single rotating polygonal mirror. The timing of light emission from the light sources is controlled in such a manner that light beams from the light sources will be deflected and scanned by mirror surfaces of the polygonal mirror, from among the plurality of mirror surfaces that form the polygonal mirror, such that the amount of color misregistration of every toner image will be less than (n?1)/n pixels.

Abstract: A scanning optical device includes a rotating polygonal mirror having a plurality of reflecting faces. A first light source emits a first light beam from one section obtained by sectioning the scanning optical device with a plane passing through the rotation axis of the rotating polygonal mirror. A second light source emits a second light beam from the other section. The first calculation unit calculates scan time of the first light source. The second calculation unit calculates scan time of the second light source. The jitter correction unit corrects jitter by controlling a pixel clock supplied to the first light source according to the scan time of the second light source. The jitter correction unit also corrects jitter by controlling a pixel clock supplied to the second light source according to the scan time of the first light source.

Abstract: The optical path of scanning light E1 reaching the photosensitive drum 82a closest to the installation plane S of a plurality of photosensitive drums 82a, 82b, 82c, and 82d is provided at the photosensitive drum side with respect to the optical path of scanning light E2 deflected and scanned on the same side as the side of polygon mirror 10 for deflecting and scanning the laser beam, from the polygon mirror 10 to folding mirrors 24, 26. The invention presents a technology capable of equalizing the length of optical paths if the regulation of optical unit in height direction is different at both sides of the rotary polyhedral mirror.

Abstract: An image reading apparatus is provided with a document glass stand on which a document is placed, and a document feeding portion having a platen roller for feeding out the document fed into the reading position of the document glass stand from the reading position and a pressure plate having elasticity and capable of pressing the document placed on the document glass stand against the document glass stand with the platen roller, and openable and closable relative to the document glass stand. A document reading sensor reads the document placed on the document glass stand while being moved below the document glass stand, and reads the document fed into the reading position while being stopped at the reading position. Design is made such that after the document feeding portion is closed and the document has been pressed against the document glass stand by the pressure plate, the platen roller presses the document against the document glass stand.

Abstract: A DC-DC converter is provided which includes a switching element, a choke coil, a flywheel diode, an output capacitor, a diode, and an auxiliary transformer having primary and secondary windings. The primary winding and the switching element constitute a first series circuit such that one terminal of the primary winding is connected to the drain terminal of the switching element, and the secondary winding and the diode constitute a second series circuit such that one terminal of the secondary winding is connected to the cathode terminal of the diode, where the other terminal of the second winding is connected to the positive terminal of a DC power source, and the anode terminal of the diode is connected to the negative terminal of the DC power source.

Abstract: A laser emitter including: a first lens barrel portion for holding a first laser element; a second lens barrel portion for holding a second laser element whose optical axis is slanted with respect to an optical axis of the first lens barrel portion, the second lens barrel portion being provided as one unit with the first lens barrel portion; a first lens supporting portion provided at the tip of the first lens barrel portion to support a first collimator lens; and a second lens supporting portion provided at the tip of the second lens barrel portion to support a second collimator lens, in which the first and second lens supporting portions are capable of supporting the collimator lenses with an adjustment range stretching in an optical axis direction, and the first and second collimator lenses are fixed and supported at positions adjusted within the adjustment range.

Abstract: A DC-DC converter is structured such that a main switching element has one terminal connected to one terminal of a DC power supply and has the other terminal connected to one terminal of a first winding of a resonance coil, a choke coil has one terminal connected to one terminal of a second winding of the resonance coil and has the other terminal connected to one terminal of an output capacitor, a rectifier diode has one terminal connected to the connection of the first and second windings and has the other terminal connected to the other terminal of the output capacitor and also to the other terminal of the DC power supply, and a series circuit including an auxiliary switching element and a clamping capacitor is provided between the other terminal of the DC power supply and the connection of the main switching element and the first winding.

Abstract: The present invention relates to an image forming apparatus comprising: a plurality of image forming means; a first image forming means; a second image forming means; a belt member to be transferred with the toner image formed on each image forming means; and a plurality of suspending members, wherein said plurality of image forming means are arranged so as to face to a first belt surface between the suspending members; the first and second image forming means are arranged so as to face to a second belt surface different from the first belt surface; and a distance, between adjacent contact portions of the image forming means on the second belt surface side and said second belt surface, is greater than a distance, between adjacent contact portions of the image forming means on the first belt surface side and said first belt surface.

Abstract: A DC-DC converter is provided which includes a switching element, a choke coil, a flywheel diode, an output capacitor, a diode, and an auxiliary transformer having primary and secondary windings. The primary winding and the switching element constitute a first series circuit such that one terminal of the primary winding is connected to the drain terminal of the switching element, and the secondary winding and the diode constitute a second series circuit such that one terminal of the secondary winding is connected to the cathode terminal of the diode, where the other terminal of the second winding is connected to the positive terminal of a DC power source, and the anode terminal of the diode is connected to the negative terminal of the DC power source.