Canon Kabushiki Kaisha

Tsuguhiro Yoshida

Kazuhiro Doda

Kohei Wakatsu

Shinji Katagiri

Yutaka Sato

Takayuki Tanaka

Shuichi Tetsuno

Masaru Shimura

Takahiro Ikeda

Takeo Kawanami

Ken Nakagawa

Yuji Kawaguchi

Keisuke Ishizumi

Masaru Ohno

Shohei Ishio

Taro Minobe

Atsushi Nakamoto

Masashi Tanaka

Kensuke Umeda

Toru Imaizumi

Kenichi Ogawa

Takashi Narahara

Yasuhito Minamishima

Masahiro Suzuki

Akihiko Uchiyama

Toshiyuki Watanabe

Shoichiro Ikegami

Eiichi Hamana

Ken Oi

Hiroyuki Munetsugu

Jun Miura

Michio Uchida

Toshihiko Takayama

Takumi Furukawa

Akinori Mitsumata

Takaaki Akamatsu

Satoru Motohashi

Akira Hayakawa

Osamu Sasaoka

Koji An

Tatsuya Kinukawa

Akinori Yokota

Hiroto Endo

Yuya Kojima

A heating apparatus includes a fixing film and a heater in the inner space of the fixing film. The heater includes a long narrow substrate and at least two or more heating elements with different lengths in a longitudinal direction. The heating apparatus further includes first and second temperature detection units configured to detect a temperature of the heater and a control unit configured to set the power ratio between a first heating element and a second heating element in response to the detection result of the second temperature detection unit.

Heating apparatus and image forming apparatus

A fixing unit includes a film, a nip forming member, a heating unit, a rotary member arranged to sandwich the film together with the nip forming member, and an end portion regulating member configured to be in sliding contact with the film and to regulate an end portion of the film in the longitudinal direction. The end portion regulating member includes a first surface facing an inner surface of the film, a second surface facing an end face of the film in the longitudinal direction, and a third surface facing an outer surface of the film and configured to regulate the end portion of the film from deforming in a manner separating from the first surface. An entirety of the third surface is disposed on an upstream side of a center position of the nip portion in a conveyance direction of the recording material in the nip portion.

Fixing unit with a film regulating surface disposed upstream of the center of a nip portion and image forming apparatus

The heater including a substrate, a first heat generation member, a second heat generation member having a length substantially a same in a longitudinal direction as a length of the first heat generation member, a third heat generation member having a length shorter than lengths of the first heat generation member and the second heat generation member in the longitudinal direction, and a fourth heat generation member having a length shorter than length of the third heat generation member in the longitudinal direction, wherein the first heat generation member, the second heat generation member, the third heat generation member and the fourth heat generation member are arranged on the substrate.

Heater including a plurality of heat generation members, fixing apparatus, and image forming apparatus

A fixing device includes a heater provided with a first heat generator on a substrate and a second heat generator of which a length in a longitudinal direction is shorter than that of the first heat generator, a temperature detector of the heater, a switch for switching a power supply path from an AC power source to the first heat generator or the second heat generator. A controller for controlling the switch to supply power to the first heat generator or the second heat generator. The controller executes a first control in which the switch supplies the power to the first heat generator, and switches a second control in which the switch supplies the power alternately to the first heat generator or the second heat generator when the detected temperature reaches a threshold temperature.

Fixing device provided with heater and image forming apparatus

A fixing apparatus including: a first rotary member; a second rotary member; a nip forming member; and a heater. The nip forming member includes: a first projection portion inside a nip area; and a second projection portion located outside the nip area. The first and second projection portion abut against the inner circumferential surface of the first rotary member. In a direction orthogonal to a nip tangent, a distance between a tip of the second projection portion and the nip tangent is larger than a distance between a tip of the first projection portion and the nip tangent. The second projection portion extends toward the second rotary member without exceeding the nip tangent. A radius of curvature at a tip portion of the second projection portion is smaller than a radius of an inner circumferential circle of the first rotary member.

Fixing apparatus having a nip area, and image forming apparatus

A fixing device includes a cylindrical fixing member, a heater arranged in an inner space of the fixing member, a pressing member to contact the fixing member and a conductive member disposed so as to contact an inner surface of the fixing member and to conduct the fixing member to a circuit for controlling a potential of the fixing member The fixing member heats an image on a recording material to fix the image onto the recording material while nipping and conveying the recording material between the fixing member and the pressing member. The conductive member is formed of metal wire.

Fixing device and image forming apparatus

A heating apparatus includes a tubular film, a heater, a first support member including a first regulation surface, and configured to rotatably support a first end of the film, a second support member including a second regulation surface, and configured to rotatably support a second end of the film, and a holding unit configured to hold the heater and determine a position of the heater in the longitudinal direction. Either one of the first support member and the second support member includes a positioning portion configured to determine a position of the holding unit in the longitudinal direction.

A fixing device includes a substrate, a first heat generator, a second heat generator with a length in a longitudinal direction of the substrate equal to a length of the first heat generator; and a third heat generator with a length shorter than the lengths of the first and second heat generators, a soaking member with a positioning portion in the longitudinal direction. In a short side direction of the substrate, the first heat generator is arranged at one end side, the second heat generator is arranged at the other end side, and the third heat generator is arranged between the first and second heat generators. The soaking member is arranged between the heater and a holder in a thickness direction. As seen in the short side direction, the positioning portion is positioned outside of an area corresponding to the third heat generator and inside of an area corresponding to the first heat generator.

A fixing apparatus including a heat generating element having a first area, a second area, and a third area, the first area being located on an end portion side in an orthogonal direction orthogonal to a conveyance direction of a recording material and having a first heat generation amount per unit length in the orthogonal direction, the second area being located on an inner side than the first area in the orthogonal direction and having a second heat generation amount per unit length in the orthogonal direction, the third area being located on the inner side than the second area in the orthogonal direction and having a third heat generation amount per unit length in the orthogonal direction. The second heat generation amount is larger than the third heat generation amount, and the third heat generation amount is larger than the first heat generation amount.

Fixing apparatus including heat generating element, and image forming apparatus

A fixing device includes a heater, a first rotatable member, a second rotatable member, and a heat equalizing member. In a case that a region including a center of the heat equalizing member with respect to a longitudinal direction is a first region, a region closer to an end of the heat equalizing member than the first region is with respect to the longitudinal direction is a second region, and a region closer to the end of the heat equalizing member than the second region is with respect to the longitudinal direction is a third region. When the heat equalizing member has thermal capacities per unit length in the first region, the second region, and the third region are C&#x3b1;, C&#x3b2; and C&#x3b3;, respectively, C&#x3b1;, C&#x3b2; and C&#x3b3; satisfy the following relationship:&#x3b2;, and

Fixing device including heat equalizing member and image forming apparatus

An intermediate transfer belt has a first region and a second region in an outer circumferential surface thereof that is in contact with a blade. The first region has a first dynamic friction coefficient in a belt conveyance direction, and the second region has a second dynamic friction coefficient. The distance of the second region in the belt conveyance direction is less than the distance of the first region and is greater than the distance of a contact portion in which the blade is in contact with the intermediate transfer belt.

Image forming apparatus

An image forming apparatus includes a fixing device having a heater, a first temperature detection unit, a pair of second temperature detection units, a pair of first sheet-width detection units, a pair of second sheet-width detection units, and a control unit. The heater includes a first heat generating element, a second heat generating element having a length smaller than a length of the first heat generating element in a longitudinal direction, and a third heat generating element having a length smaller than the length of the second heat generating element in the longitudinal direction. The control unit controls a temperature of the heater based on a detection result of the pair of first sheet-width detection units, a detection result of the pair of second sheet-width detection units, and a detection result of the pair of second temperature detection units.

Image forming apparatus including a plurality of heat generating elements

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Yokohama, Japan

Tsuguhiro Yoshida