Canon Kabushiki Kaisha

Kazuhiro Doda

Kohei Wakatsu

Tsuguhiro Yoshida

Yutaka Sato

Ken Nakagawa

Masaru Shimura

Satoshi Nishida

Takanori Mitani

Takashi Narahara

Isamu Takeda

Akimichi Suzuki

Takeshi Shinji

Kenji Kanari

Seiji Saito

Toru Imaizumi

Michio Uchida

Takaaki Akamatsu

Takamitsu Soda

Takashi Shimada

Shigeru Hoashi

Ichiro Yasumaru

Seiji Inada

Akinori Takayama

Masahiro Suzuki

Atsushi Nakamoto

Akira Okano

Yuuichirou Inaba

Shuuichi Tetsuno

Tomoya Kuruma

Karen Tsunashima

Ryo Miyata

Takanori Watanabe

Shuichi Tetsuno

Hideo Nanataki

Kensuke Umeda

Tomoo Akizuki

Yuichiro Inaba

Masahiko Suzumi

Shoichiro Ikegami

Yasuhito Minamishima

Keisuke Samejima

Kazuaki Takahata

Ken Oi

Hiroshi Yadoiwa

Akira Yoshimura

Shinji Katagiri

Jun Miura

Toshiyuki Watanabe

Koji An

Shogo Kan

Hiroto Endo

Yuuichiro Inaba

Yuuichirou c/o Canon Kabushiki Kaisha Inaba

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

An image forming apparatus includes first and second rotatable members forming a nip therebetween, a heater disposed in inside of the second rotatable member, a first temperature sensor provided on a center of the heater, a second temperature sensor provided on an end side of the heater. A controller controls a feeding interval in which a trailing edge of a preceding sheet passes through the nip until a leading edge of a subsequent sheet reaches the nip. The controller controls the feeding interval to be a first interval in a case which a feeding speed of the sheet is a first speed and a detected temperature by the second sensor is a first temperature, and to be a second interval shorter than the first interval in a case which the feeding speed is a second speed lower than the first speed and the detected temperature is the first temperature.

Image forming apparatus that forms images on a recording material

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

An image forming apparatus includes a fixing unit including a tubular film, a pressure roller, and a heater including a heating element. The apparatus further includes a control unit configured to calculate an accumulated electrical energy supplied to a portion of the heating element. The portion of the heating element is located in an area corresponding to a second area of the nip portion. The second area is an area of the nip portion through which the recording material conveyed to the nip portion is not passed. The control unit is configured to determine an operation of heat leveling, which is performed for leveling a heat distribution in the nip portion after the recording material had passed the nip portion, based on the calculated accumulated electrical energy.

Image forming apparatus

A fixing unit includes a tubular film, a pressure roller, a heater including a first heating element and a second heating element, a detector configured to detect a temperature of the heater, a switcher configured to switch which of the first heating element and the second heating element is supplied power from a power supply, and a controller configured to control the switcher. The controller is configured to execute a first control of determining a first electric energy and a second electric energy based on the temperature of the heater detected by the detector and a target temperature of the heater, and a second control of causing the switcher to switch between a state in which power is supplied to the first heating element by the first electric energy and a state in which power is supplied to the second heating element by the second electric energy.

Fixing unit and image forming apparatus

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

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

An image forming apparatus is operable in a first small-sheet printing in which power is supplied to the first heat generating element and the second heat generating element and in a second small-sheet printing in which power is supplied to the first heat generating element and the third heat generating element. A first power ratio, which is a proportion of power supplied to the first heat generating element to power supplied to the second heat generating element in the first small-sheet printing, is higher than a second power ratio, which is a proportion of power supplied to the first heat generating element to power supplied to the third heat generating element in the second small-sheet printing.

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Yokohama, Japan

Kazuhiro Doda