Canon Kabushiki Kaisha

Kazuyuki Iwamoto

Kenichi Manabe

Kenichi Hayashi

Wataru Kawata

Yoshifumi Takehara

Naho Saitoh

Hiroshi Matsumoto

Yushi Oka

Takao Nakajima

Daisuke Aruga

Noriyoshi Ueda

Shinichi Takata

Takuma Nakamura

Katsuhito Kato

Hiroyuki Eda

Kentaro Tamura

Ryou Sakaguchi

Rin Ishikawa

Tsuyoshi Tajiri

Michiharu Masuda

Akifusa Ando

A sheet conveying apparatus to convey a sheet to an image forming unit includes a main body, an opening/closing member, and first, second, and third portions. The opening/closing member can be opened and closed with respect to the main body, and the first, second, and third portions pivotably support the opening/closing member. The second support portion is provided below the first support portion and above the third support portion. Each of the first, second, and third portions include a projecting portion and a hole portion. A difference between a greatest length of the third projecting portion and a diameter of the third hole portion is larger than a difference between a greatest length of the first projecting portion and a diameter of the first hole portion and is larger than a difference between a greatest length of the second projecting portion and a diameter of the second hole portion.

Sheet conveying apparatus and image forming apparatus

In an image forming apparatus, an image forming unit forms a first image of a first color and a second image of a second color. An obtaining unit obtains information related to relative positions of a first measurement image, which is formed on an image carrier, of the first color and a second measurement image, which is formed on an image carrier, of the second color. A generation unit generates correlation data based on first information corresponding to a first image forming speed and second information corresponding to a second image forming speed. A controller, in a case where the image forming unit forms an image at the second image forming speed, corrects relative positions of the first image and the second image based on the first information in advance and the correlation data.

Image forming apparatus that forms color image by superimposing plurality of images in different colors

An image forming apparatus includes a determiner for determining whether to execute a first image formation in an acquisition mode, in which an image forming operation is carried out using an acquired timing, or a second image formation in a non-acquisition mode, in which the image forming operation is carried out using exposure timing acquired in a previous acquisition mode. The determiner makes the determination on the basis of a current output of a temperature sensor and a previous output of the temperature sensor. When the determiner determines the execution of the first image formation, driving speeds of a first driver and a second driver are set, before the execution of the operation in the acquisition mode, on the basis of the current output of the temperature sensor, and the operation in the acquisition mode and the image formation are carried out using the driving speeds currently set.

Image forming apparatus

First to N-th image forming units are sequentially arranged from the upstream to the downstream along the movement direction of an intermediate transfer belt. When L is defined as a distance between contact points of every two adjacent ones of the first to N-th image bearing members with the intermediate transfer member, when V is defined as a moving speed of the intermediate transfer belt and, when a timing at which transfer bias applying unit for the n-th image forming unit is turned off using a timing at which the transfer bias applying unit for the first image forming unit is turned off as reference is defined as (L/V)&#xd7;(n&#x2212;1)+&#x3b1;, &#x3b1;for every integer n between 2 and N is set so that an absolute value of &#x3b1;is less than L/V and at least one pair of &#x3b1;among the plurality of &#x3b1;has different values.

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 a position of an intermediate transfer belt, having been located at a developing position when a developing bias is started to be applied to the second developing portion, arrives at a transfer position.

A light beam emitting apparatus including: a light source having plural light emitting points emitting beams; and a holding member configured to hold the source and having first, second, and third abutment portions, an emission direction of the beams being regulated by the abutment portions in abutment with the source, wherein as viewed along an optical path of the beams, an angle formed by a first line connecting two farthest light emitting points with a second line connecting the first and second abutment portions is smaller than angles formed by the first line with a third line connecting the second and third abutment portions and formed by the first line with a fourth line connecting the third and first abutment portions, and a distance between the first and second abutment portions is larger than distances between the second and third abutment portions and between the third and first abutment portions.

Light beam emitting apparatus, light scanning apparatus, and image forming apparatus

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.

Image forming apparatus with beam splitter and aperture positioned for compactness

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.

Scanning optical device, image forming device and jitter correction method

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.

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.

Original feeding apparatus, original reading apparatus, and image forming apparatus

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.

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&#x2212;1)/n pixels.

Image forming apparatus and method of controlling same

The optical path of scanning light Ereaching the photosensitive drumclosest to the installation plane S of a plurality of photosensitive drums, andis provided at the photosensitive drum side with respect to the optical path of scanning light Edeflected and scanned on the same side as the side of polygon mirrorfor deflecting and scanning the laser beam, from the polygon mirrorto folding mirrorsThe 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.

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.

Image reading forming apparatus having a platen roller pressing a document against the document glass stand

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.

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Kashiwa, Japan

Kazuyuki Iwamoto