Canon Kabushiki Kaisha

Sho Taguchi

Masashi Tanaka

Shoichiro Ikegami

Kensuke Umeda

Ai Suzuki

Tatsuya Kinukawa

Toru Imaizumi

Masahiko Suzumi

Naofumi Murata

Takeharu Nakada

Hikaru Osada

Masahito Omata

Yutaka Sato

Yutaka Arai

Tomoo Akizuki

Katsuhisa Matsunaka

Jun Agata

Masafumi Maeda

Takaaki Akamatsu

Jun Asami

Kohei Okayasu

Osamu Sasaoka

Ryukichi Inoue

Kouji Yasukawa

Kenji Matsuzaka

Masatoshi Takiguchi

Yuki Oshima

Kouichi Yamada

An image forming apparatus includes a photosensitive member; an exposure portion configured to expose the photosensitive member to light depending on image information to form a latent image on the photosensitive member; a developing portion configured to develop the latent image into a toner image with toner; and a transfer portion configured to transfer the toner image from the photosensitive member onto a recording material. The image forming apparatus changes a surface movement speed of the photosensitive member at timing prior to predetermined timing, when a moving speed of a recording material at the transfer portion changes, by a predetermined time.

Image forming apparatus

A heater includes: a substrate; an insulating layer that is provided on the substrate; and a heat generating element that is provided on the insulating layer, and in a case where a region including a center of the substrate is defined as a first region, a region on a side closer to one end portion than the first region is defined as a second region, and a region on a side closer to the other end portion than the first region is defined as a third region in a transverse direction that is orthogonal to a longitudinal direction of a surface of the substrate on which the insulating layer is provided, the first region is a plane, and the second region and the third region are bent from the first region in a thickness direction of the substrate that is orthogonal to the longitudinal direction and the transverse direction.

Heater, heating device, and image forming apparatus

A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.

Image heating device

A fixing unit includes a film with a tubular shape, a nip forming unit including a heater and configured to be in sliding contact with an inner surface of the film. The heater includes a substrate made of metal. The fixing unit further includes a power supply connector electrically connected to the power supply electrode so that the power supply connector is connected to the heating element at a first end portion of the substrate in a longitudinal direction of the heater, and a pressing member opposed to the nip forming unit. The fixing unit further includes a voltage application circuit configured to apply a voltage of a same polarity as a normal charging polarity of the toner to the substrate, the voltage application circuit being connected to the substrate at a second end portion of the substrate opposite to the first end portion in the longitudinal direction.

Fixing unit that applies a voltage to substrate or a pressing member, and image forming apparatus

A fixing unit includes a film with a tubular shape, a nip forming unit including a heater and configured to be in sliding contact with an inner surface of the film, the heater including a substrate made of metal, an insulating layer formed on the substrate, and a heating element arranged on the insulating layer and configured to generate heat when a first AC voltage is applied from an AC power supply connected thereto, a pressing member opposed to the nip forming unit with the film interposed therebetween and configured to form a nip portion with the film, and a voltage application circuit configured to apply a second AC voltage to the substrate with a waveform that takes a voltage value of an opposite polarity to the first AC voltage when the first AC voltage takes a peak value.

Fixing unit and image forming apparatus

A fixing apparatus includes a thermal conductive member that is in contact with a heater and has a thermal conductivity higher than the thermal conductivity of a base material of the heater, and a thermal-resistant member that is disposed between the thermal conductive member and a support member configured to support the heater, a thermal resistance in a thickness direction of the thermal-resistant member being higher than the thermal resistance in the thickness direction of the thermal conductive member.

Fixing apparatus providing a fixing apparatus capable of suppressing a temperature rise in a non-sheet-passing portion without degrading first print out time

A pressure roller, and the pressure roller to be used in a fixing apparatus of in an image forming apparatus, the fixing apparatus configured to heat a toner image formed on a recording material and fix the toner image on the recording material, the pressure roller including a first elastic layer, and a second elastic layer provided on an outside of the first elastic layer, wherein a thermal conductivity of the first elastic layer is higher than a thermal conductivity of the second elastic layer, and wherein the first elastic layer contains a plurality of void portions, hole pathway portions joining the plurality of void portions to each other, and a needle-shaped high thermal conductive filler.

Pressure roller for fixing apparatus, fixing apparatus and image forming apparatus

Image data of an image formed on a recording material includes a plurality of picture elements. A predetermined number of picture elements which is a portion of the image data are converted as one region to thereby convert the image data to conversion data including a plurality of regions. A value related to a print ratio in each of the regions of the conversion data is analyzed to acquire a value related to connection indicating how continuously regions in which the value related to the print ratio exceeds a threshold are adjacent to each other. Energization of the heat generating element is controlled on the basis of the temperature detected by the temperature detection portion and a control target temperature calculated from the value related to the connection.

An image forming apparatus includes an image forming portion that forms an image on a recording material, and a fixing portion including a cylindrical heat transfer member, and a heating member contacting an inner surface of the heat transfer member. The fixing portion fixes the image on the recording material by heating the recording material, on which the image has been formed, by heat from the heating member through the heat transfer member. A control unit controls a target temperature of the heating member, and analyzes whether or not a plurality of pixels, of image data corresponding to the image to be formed on the recording material, in each interval corresponding to a circumferential length of the heat transfer member, with respect to a recording material feeding direction, are pixels for forming an image with a predetermined density or more, and sets the target temperature depending on an analyzation result.

Image forming apparatus that controls a target temperature of a heating member based on whether pixels for forming an image are a predetermined density or more

A fixing device includes a belt, a heater, and a pressing member for forming a nip through the belt in cooperation with the heater. The nip includes a region at which a width of the nip with respect to a feeding direction of a recording material gradually increases from a longitudinal central portion toward a longitudinal end portion, and a pressure of the nip gradually increases from the longitudinal central portion toward the longitudinal end portion. A heat-conductive member includes a regulating portion for regulating movement thereof relative to a supporting member in a longitudinal direction of the heater. The regulating portion is provided in a region of the heat-conductive member corresponding to a position of the nip closer to the longitudinal end portion than to the longitudinal central portion, and a bias member is provided outside of the region of the heat-conductive member corresponding to the position of the nip.

Fixing device for fixing an image on a recording material and including a heat-conductive member with a regulating portion

In a configuration in which a voltage of polarity opposite to charging polarity of toner is applied to a conveyance guide, controlling deposition of toner on the conveyance guide has been difficult. When performing duplex image formation, a potential difference between a surface potential of a photoconductive drum charged by a charging roller and a potential of the conveyance guide is smaller during printing on the second surface than during printing on the first surface.

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Fujisawa, Japan

Sho Taguchi