Canon Kabushiki Kaisha

Kensaku Kusaka

Shigeo Kimura

Hidekazu Maruta

Akira Yamamoto

Hiroyuki Adachi

Atsushi Hosoi

Hiromitsu Hirabayashi

Atsushi Arai

Yoshiaki Takayanagi

Masahide Kinoshita

Koji Masuda

Yoshihiko Suzuki

Shokyo Koh

Hirokazu Takahashi

Yoshiaki Kobayashi

Kazuo Kishino

Shigeaki Takada

Tsuyoshi Watanabe

Akiyoshi Kimura

Yasutsugu Saijo

Morikazu Mizutani

Manabu Takano

Takeo Yamamoto

Jun Asai

Takashi Hibi

Minoru Nada

Hideki Fujita

Kazuhiko Ishiwata

Takahiro Noguchi

Tamotsu Okada

Hisaaki Senba

Michio Shigenobu

Kanji Yano

Keigo Kaji

Satoshi Tomiki

Ryuichi Iwanaga

Shinichi Konno

Ikuko Naruse

Hidekazu Muruta

Takao Tanaka

Shigeo Kumura

An image reading apparatus including a light source for illuminating an original, a white member which is illuminated by the light emitted from the light source, a photoelectric converting element for receiving the reflection light from the original and the reflection light from the white member, a memory for storing a reference output of the photoelectric converting element which is obtained by receiving the reflection light from the white member, a shading compensation device for compensating an output of the photoelectric converting element which is obtained by receiving the reflection light from the original in accordance with the reference output, and a rewriting device for rewriting the reference output to be stored in the memory, wherein the rewriting device rewrites the reference output at a timing according to a fluctuation in light amount of the light source.

Image reading apparatus providing shading compensation related to the on-time of the light source

The present invention relates to an image forming apparatus in which current control means constant-current-controls a current value flowing in a transfer member so as to become constant, voltage control means constant-voltage-controls a voltage value applied to the transfer member so as to become constant, and selecting means selects a control of the transfer member during transfer to constant current control or constant voltage control in conformity with the thickness of the transfer material.

Image forming apparatus in which whether transfer member should be constant-current-controlled or constant-voltage-controlled is selected depending on thickness of transfer material

A fixing device and an image forming apparatus having such a device is constructed by an unfixed image forming unit to form an unfixed image onto a recording material in accordance with start of an image formation, a heater in which a heat generating material which generates a heat by an energization is provided on a substrate, the unfixed image formed by the unfixed image forming unit being heated and fixed onto the recording material by a heat from the heater, and a power supplying unit for supplying an electric power to the heater in a first mode with a first maximum power by the start of the image formation and, subsequently, for supplying an electric power to the heater in a second mode with a second maximum power. The first maximum power is smaller than the second maximum power. In both of the first and second modes, the powers are controlled so that the heater is set to a predetermined temperature. When a predetermined time elapses from the start of the energization by the start of the image formation or when a temperature sensor detects a predetermined temperature of the heater, the operating mode is changed from the first mode to the second mode.

Fixing device and image forming apparatus having such device

An image forming apparatus comprising an image forming unit for forming a non-fixed toner image on a recording material, a heater for heating the non-fixed toner image, a back-up member for cooperating with the heater to form a nip therebetween, the back-up member pinching and conveying the recording material at the nip in such a manner that the non-fixed toner image is contacted with the heater so that the non-fixed toner image is fixed to the recording material by heat from the heater, and a cleaning member for cleaning the back-up member. The cleaning member is brought into a first and second cleaning mode in which an image forming operation is not effected and the back-up member is cleaned, the second cleaning mode having a cleaning time longer than a cleaning time of the first cleaning mode.

Image forming apparatus having fixing apparatus with cleaning device

An image heating apparatus includes a heater which heats an image on a recording material, which extends in a direction perpendicular to a moving direction of the recording material; a first temperature detecting member for detecting the temperature of the heater; power controlling device for controlling the power supplied to the heater, so that the temperature detected by the temperature detecting member remains constant; a second temperature detecting member which is positioned at a location apart, in the longitudinal direction of the heater, from where the first temperature detecting member is positioned; and an interrupting device for interrupting the imaging heating process in accordance with the temperature detected by the second temperature detecting member.

Image heating apparatus with multiple temperature detecting members

An image forming apparatus contains a heater and a sheet movable with a recording material in sliding contact with the heater, wherein the image is heated by heat from the heater through the sheet. The heater has an electrically insulative member, a heat generating resistor arranged on the electrically insulative member in a direction crossing with a movement direction of the sheet, an electrode for supplying electric power to the resistor and a protection layer covering the heat generating resistors, and in sliding contact with the sheet.

Image fixing heater and image fixing apparatus having same

Imaging forming apparatus includes an image bearing member, an image formation unit for forming an image on the image bearing member, and a detection unit for detecting a voltage-current characteristic between the image bearing member and the charging member. The image formation unit has a charging member contactable to the image bearing member to charge the image bearing member. An image formation condition for the image bearing member is determined on the basis of a plurality of detection operations of the detection unit.

Image forming apparatus having detection means to maintain image

An image heating apparatus includes a heater, the heater including a base material and a heat generating element on the base material; a film contacting the heater at one surface carrying a toner image at the other surface; wherein the toner image on the recording material is heated by heat from the heater through the film, wherein the base material of the heater is of an elastic material.

Image heating apparatus with elastic heater

An image forming apparatus includes an image forming device for forming an unfixed image on a recording material; a heater; and a film movable with the recording material carrying the unfixed image, the heater heats the unfixed image through the film and a control unit controls the fixing conditions in accordance with the thermal property of the film.

Image fixing apparatus and image forming apparatus

An image heating apparatus has a heater, a film for transferring heat from the heater to an image on a recording material, a rotary backup member for forming a nip with the film and a cleaning member for cleaning a peripheral surface of the rotary backup member. A device for moving the cleaning member is provided so that the cleaning member comes in contact with, or moves away from, the surface of the rotary backup member such that the moving device places the cleaning member in contact with the surface of the rotary backup member after the temperature of the rotary backup member increases.

Image heating apparatus comprising backup roller provided with heat

A heating apparatus includes a heater; a film in slidable contact with the heater and movable together with a recording material carrying an image, such that the image is heated by heat from the heater through the film. The heater is provided with a heat resistive resin layer for sliding contact with the film.

Heating apparatus using heater having heat-resistive resin layer

An image forming apparatus contains an accommodator for accommodating a recording material together with an image forming device for forming an image on that recording material supplied from the accommodator. A fixing apparatus receives the imaged recording material and includes a heat generating resistor layer, a protection layer covering the heat generating resistor layer and a sheet movable with the recording material in sliding contact with the protection layer, wherein the image is heated by heater through the sheet. A position detector detects the position of the recording material and the power supply to the heat generating resistor layer is started in accordance with the output of the position detector.

Image fixing apparatus

An image fixing apparatus includes a heater; a film movable with a recording material, wherein the recording material have a visualized image which is heated through the film by heat from the heater; wherein the film includes a heat resistive resin base layer containing fluorine resin. The resin base layer having at least one of polyimide, polyether ether ketone, polyether sulfon, and polyether imide resin material.

Image fixing apparatus using fixing film containing fluorinated resin

An image fixing apparatus includes a heater; a sheet in slidable contact with the heater; and a back-up member cooperative with the heater to form a nip therebetween such that the sheet is interposed in the nip. An unfixed image on a side of a recording material in contact with the sheet is heated and fixed by heat from the heater through the sheet. The sheet includes (i) a base resin layer in slidable contact with the heater, and (ii) a surface parting layer disposed on the base resin layer. The surface parting layer is thinner than the base resin layer.

A heating apparatus includes a heater which is stationary in use; a film in sliding contact with the heater; a pressing member cooperative with the film to form a nip therebetween; wherein the heater is provided with a portion which is stepped in a direction away from the film toward downstream with respect to a movement direction of the film, the stepped portion being in a width of the nip.

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Kawasaki, Japan

Kensaku Kusaka