Canon Kabushiki Kaisha

Ayumu Murakami

Yuichi Yamamoto

Kyota Miyazaki

Yutaka Ban

Kazuhiko Omata

Haruhisa Oshida

Takeshi Aoyama

Shoko Magata

Kiyoshi Oyama

Toshifumi Itabashi

Yusuke Imai

Takuma Koizumi

Takayuki Suga

Katsuya Murakami

Shinichi Onodera

Fumio Tazawa

Hajime Sekiguchi

Daisuke Morikawa

Kazuaki Aoki

Masaru Usami

A light guide includes a plurality of boss portions. A round hole portion is provided near the center of a base member for fixing the light guide, and slit portions are provided on both ends thereof. The round hole portion supports one boss portion in both the longitudinal direction and the lateral direction of the light guide. The slit portions support boss portions in the lateral direction of the light guide, but are free in the longitudinal direction of the light guide. That is, the center of the light guide is fixed from both directions, and thus both ends of the light guides can expand away in the longitudinal direction. This cuts the influence of expansion by half.

Original reading apparatus for reading image of an original

A plurality of LEDs (light emitting diodes) are mounted upon a metallic plate member, and thus heat from the plurality of LEDs is transmitted to the metallic plate member. The plate member functions as a heat radiating plate. In addition, a light guide is fixed to the plate member so that a surface of the light guide and a surface of the plate member that face each other are parallel.

Light guide unit that guides light in an original document reading apparatus

An image reading apparatus includes a control unit that is configured to suspend an operation of a separation-feeding unit in a feeding operation when the control unit determines, based on a signal from a leading edge detecting unit, that an inclined amount of the leading edge of a fed document is larger than a setting value. The control unit is also configured to set, when a mixture of different widths is set to the setting unit, the setting value larger in comparison to a case where a mixture of different widths is not set.

Image reading apparatus

The image forming apparatus includes first and second reading portions which read images of first and second faces of an original, an image forming portion which forms an image on a sheet based on image data read by the reading portions, a calculation portion which calculates difference between respective image data, a correction portion which calculates correction data to decrease difference of the image data based on the image data difference, and a control portion which controls the image forming portion so that an image for correction to correct the reading accuracy difference is formed on a sheet based on the correction data; and the calculation portion calculates difference between respective image data when the image for correction formed on a sheet is respectively read by the first and second reading portions, and the correction portion recalculates correction data based on the image data difference calculated by the calculation portion.

Image forming apparatus

A sheet conveyance device has a sheet conveyance path formed by a guide member having a curved surface which is curved in a sheet conveyance direction, and a flexible sheet scanner is provided along the curved surface of the guide member, the flexible sheet scanner has an optical sensor layer in which photoelectric conversion devices formed by combinations of organic transistors and organic photodiodes are continuously arranged in a matrix shape.

Sheet conveyance device and image forming apparatus

An image reading apparatus is provided that can prevent image streaks due to dirt, stain or the like from being produced in an image of an original that is read while being conveyed. The image reading apparatus (A) includes an ADF () having a scanner unit () incorporated therein and comprised of a cylinder () having an outer peripheral surface thereof on which a plurality of read pixels () are arranged in a matrix. In reading an original (D), the scanner unit is rotatably driven in an original conveying direction at a circumferential speed approximately equal to an original conveying speed, and reads image information on the original passing through an image reading position (P).

An image scanning device including: a conveyance path which conveys originals; a first scanning means and a second scanning means which are placed such that they sandwich the conveyance path; and a white reference member used for adjusting the white levels of the scanning means; wherein at least one of the first scanning means, the second scanning means and the white reference member is movable; the first scanning means and the second scanning means can scan the same surface of said white reference member since the first scanning means or the second scanning means is moved or the white reference member is moved.

Image scanning device and image forming device

A sheet conveyance device according to an aspect of the invention includes a conveyance roller pair which is rotated to convey a sheet by receiving a driving force from a motor conveying a sheet; a conveyance guide which guides the sheet conveyed by the conveyance roller pair; and sheet detection unit for detecting the sheet guided by the conveyance guide. In the sheet conveyance device, a sheet conveyance speed of the conveyance roller pair is controlled based on information from the sheet detection unit. The sheet detection unit is a sheet scanner having an optical sensor layer in which photoelectric conversion devices formed by combinations of organic transistors and organic photodiodes are continuously arranged in a matrix shape, and the sheet scanner is provided in an area of the conveyance guide in order to continuously detect the sheet conveyed by the conveyance roller pair in a predetermined area.

A sheet conveyance device according to an aspect of the invention includes a guide member and a flexible guide assist member. The guide member constitutes a conveyance path for guiding a conveyed sheet. The guide assist member is provided in the guide member, the guide assist member is brought into contact with the conveyed sheet to apply a force to the sheet, and whereby the guide assist member assists the guidance of the sheet conveyance. The sheet conveyance device is characterized in that a sheet scanner is provided in the guide assist member. In the sheet scanner, photoelectric conversion devices formed by organic semiconductor devices are arranged.

Sheet conveyance device, image forming apparatus and image reading apparatus

An image scanner in which in scanning an image of a document placed on a scanner body, an image scanning device moves and scans the image of the document. In scanning an image of a document fed by a document feeder to the scanner body, the image scanning device moves to a predetermined scanning position and then scans the image of the document in the scanning position. When the image scanning device arrives at the scanning position, the image scanning device is pressed against a stopper that is positioned relative to the document feeder.

Image scanner with image scanning device positioning

An image reading apparatus comprises an original placement portion on which an original is to be placed, optical unit for optically scanning the original on the original placement portion while moving relative to the original placement portion and a guide member that guides movement of the optical unit. The optical unit includes a sliding member having a screw portion that slides in contact with the guide member and a screw hole portion to which the sliding member is mounted. The screw portion of the sliding member is plastically deformable and screwed into the screw hole portion while being plastically deformed.

An image reading apparatus and an image expansion and contraction correcting method are provided that improve the quality of each read image by restraining image expansion and contraction caused by a variation in the combination of conveying units for conveying each document. The image reading apparatus has conveying units (a first conveying unit, a second conveying unit, and a third conveying unit) that convey each document, and an image reading unit (a first image reading unit and a second image reading unit) that reads an image of each document being conveyed by the conveying units. The image reading speed of the image reading unit is adjusted in accordance with a change in the combination of conveying units that are conveying a document, so as to correct image expansion and contraction caused by a change in document conveying speed caused by the change in the combination of conveying units.

Image reading apparatus, and image expansion and contraction correcting method

An original-transporting rotor configured to transport an original to an image-reading section and, after correcting skew of the original, to an original-transporting section capable of opening and closing relative to the image-reading section is provided. The original-transporting rotor is supported so as to define a variable angle with a light source provided in the image-reading section. When the original-transporting section is closed, an original-transporting mechanism is positioned by position regulating members.

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Abiko, Japan

Ayumu Murakami