Canon Kabushiki Kaisha

Takaaki Tsuruya

Toshiaki Miyashiro

Akihiko Takeuchi

Naoki Enomoto

Tatsuya Kobayashi

Takehiko Suzuki

Minoru Hayasaki

Yuki Nishizawa

Matsutaka Maeda

Akira Okano

Kazuhiro Funatani

Hiroyuki Seki

Akira Kuroda

Aoji Isono

Yoshiro Saito

Naoko Kasai

Makoto Souma

Tetsuya Kobayashi

Hiroshi Sasame

Akihiko Uchiyama

Michio Uchida

Atsuyoshi Abe

Yoichiro Maebashi

Tetsuya Sano

Hiroyuki Sakakibara

Tomonori Shida

Haruo Fujii

Yasutaka Yagi

Koji Yasui

Taku Kanai

Masahiro Suzuki

Satoshi Shimizu

Hiroshi Mano

Akira Kato

Takashi Kawana

Tsutomu Shimano

Tomoaki Nakai

Shunsuke Hijikata

Kohei Matsuda

Taku Fukita

Tomoyuki Araki

Kenji Takagi

Yusaku Iwasawa

Yasuo Yoda

Masaki Shimomura

Yasunari Kobaru

Tamotsu Kaneko

Hirotaka Ishii

Shigeto Tamura

Hiroki Eguchi

Masatake Usui

Shunichi Ebihara

Tomoki Matsuda

Isao Matsuoka

Yusuke Isomi

Takaomi Uezono

Toru Saito

Tomoaki Imura

A fixing rotating member comprising: a first resin layer having an endless shape; at least one heating layer on the first resin layer; a second resin layer on the heating layer; an elastic layer on the second resin layer; and, a surface layer on the elastic layer, wherein the first resin layer and the second resin layer are different from in elastic modulus at a specific temperature by at least 10%, and a neutral axis in a thickness direction of the fixing rotating member is located in the heating layer or in the second resin layer in the central region and the end region, the end region is a region from both ends of the heating layer in the width direction to a specific length toward a center, and the central region is a region of a specific length from the center to both ends.

Fixing rotating member and fixing apparatus, and electrophotographic image forming apparatus

A fixing rotating member comprising: a substrate comprising a resin; an electro-conductive layer on the substrate; and a resinous layer on a surface of the electro-conductive layer, the surface being opposed to a side of the electro-conductive layer facing the substrate, the electro-conductive layer extending in a circumferential direction of an outer peripheral surface of the substrate, the electro-conductive layer comprising silver, the electro-conductive layer having, in a thickness direction thereof, a through-hole, wherein at least a part of the through-hole is penetrated by a resin that constitutes at least a part of the resinous layer.

Fixing rotating member, fixing apparatus, and electrophotographic image forming apparatus

A fixing rotating member comprising: a base material and an electro-conductive layer on the base material; the electro-conductive layer extending in a circumferential direction of an outer peripheral surface of the base material, the electro-conductive layer comprising silver, an average crystal grain size of crystals of the silver observed in a cross section along a circumferential direction of the electro-conductive layer being 20 to 200 nm, and the electro-conductive layer having a volume resistivity of 1.0×10to 8.0×10Ω·m.

Fixing rotating member, fixing device, electrophotographic image forming apparatus, and method for manufacturing fixing rotating member

A fixing unit includes a tubular film including a heat generating layer, a nip forming member including a sliding surface configured to be in sliding contact with an inner surface of the film, a heat generation mechanism configured to cause the film to generate heat, and a pressing member that is configured to be in contact with an outer surface of the film. The film includes a heat generating layer, an inner layer formed on an inner circumference side of the heat generating layer, and an outer layer formed on an outer circumference side of the heat generating layer. The sliding surface of the nip forming member includes a protruded portion that is protruded toward the pressing member in a third direction. A neutral axis of the film is positioned within the outer layer.

Fixing unit and image forming apparatus

A fixing member includes a conductive layer that generates heat when a circulation current in a circumferential direction of the fixing member having a tubular shape is induced. The conductive layer includes segments arranged in a row in a longitudinal direction of the tubular shape and electrically separated from each other. Each segment is formed continuously over an entire circumference of the tubular shape in the circumferential direction. The conductive layer is configured such that a heat generation amount in an end portion of the fixing member in the longitudinal direction is less than a heat generation amount in a central portion of the fixing member in the longitudinal direction when an alternating magnetic field is applied to a whole area of the fixing member in the longitudinal direction in a state where a temperature of the central portion is equal to a temperature of the end portion.

Fixing member and fixing unit

A fixing unit includes a rotary member that includes a conductive layer, a magnetic core inserted in an interior space of the rotary member, and an energizing coil that includes a conductor and that is wound helically around a circumference of the magnetic core. In a case where a distance between a first cross section of the conductor in a plane along the longitudinal direction and a second cross section of the conductor in the plane and adjacent to the first cross section in the longitudinal direction is L1 (mm), and a distance between the conductor and the magnetic core in a radial direction orthogonal to the helical axis is L2 (mm), following inequalities are satisfied, L1>0.1 and 0.1<L2<2.0.

A fixing member includes a conductive layer including a plurality of conductive elements. In a direction of a generatrix of the fixing member, when an area through which a recording material with a maximum width conveyable to the fixing member passes is referred to as a first area, the first area includes a central area and an end portion area. The central area includes a central portion of the first area in the direction of the generatrix. The end portion area includes an end portion of the first area in the direction of the generatrix. A resistance value of each of the plurality of conductive elements disposed in the central area is a first resistance value. A resistance value of each of the plurality of conductive elements disposed in the end portion area is a second resistance value that is lower than the first resistance value.

A fixing rotating member that includes: a cylindrical base member comprising at least a resin; an electro-conductive layer on the base member; and a resinous layer on a surface of the electro-conductive layer, the surface being opposed to a surface facing the base member, the electro-conductive layer extending in a circumferential direction of an outer circumferential surface of the base member, the electro-conductive layer containing silver, the electro-conductive layer having a volume resistivity of 1.0×10to 8.0×10Ω·m, and the electroconductive layer having a compressive elastic modulus of 8 to 30 GPa, the elastic modulus being measured by contacting an indenter with a first surface of the electroconductive layer opposite to a surface facing the base member, and the elastic modulus being an average value of elastic moduli of a thickness region of 0.1 to 0.2 μm from the first surface of the electroconductive layer.

Fixing rotating member, fixing device with fixing rotating member electrophotographic image forming device with fixing rotating member, and method of producing fixing rotating member

An image forming apparatus includes an image forming portion, a fixing portion configured to heat the toner image formed on the sheet by the image forming portion and fix the toner image to the sheet, a folding portion configured to fold the sheet having passed through the fixing portion such that a surface of the sheet to which the powder adhesive is applied is inside, and a bonding portion configured to heat the sheet folded by the folding portion and bond the sheet by the powder adhesive. A relationship of Tmax1>Tmax2 is satisfied, where Tmax1 (° C.) is a highest temperature of the powder adhesive when being heated by the fixing portion and Tmax2 (° C.) is a highest temperature of the powder adhesive when being heated by the bonding portion.

Image forming apparatus

A fixing apparatus to fix a toner image formed on a recording material to the recording material includes a rotatable member having a heat generation layer, a power supply circuit, and a control unit. The power supply circuit supplies electrical power to the rotatable member. The control unit controls supply of electrical power to the rotatable member and detects a change rate of electrical resistance of the heat generation layer. The heat generation layer generates heat by the electrical power supplied to the rotatable member, and the toner image on the recording material is fixed to the recording material by the heat from the heat generation layer. If the change rate of the electrical resistance to the supplied electrical power is higher than a predetermined threshold, the control unit stops the supply of electrical power to the rotatable member.

Fixing apparatus

A fixing apparatus includes a rotary member including a heat-generation layer with a plurality of rings, a temperature detecting portion configured to detect a temperature of the rotary member, a conduction detecting unit configured to detect a conduction failure in an opposing ring that is one of the plurality of rings of the heat-generation layer and that opposes the temperature detecting portion, and a controller configured to control the supply of power to the magnetic field generator. The conduction detecting unit includes a first magnetic core, a second magnetic core, and a current detecting portion that includes a detection coil. A length of one of the first magnetic core and the second magnetic core around which the detection coil is wound is less than a length of another of the first magnetic core and the second magnetic core around which the detection coil is not wound.

Fixing apparatus and image forming apparatus

An image heating apparatus including a sleeve having divided heat generating layers, an exciting coil provided in an inside space of the sleeve, a magnetic core provided inside the exciting coil, a temperature detecting element opposing one of the divided heat generating layers, and a current monitoring sensor. An induced current is generated in the divided heat generating layers by passing an alternating current through the exciting coil, and the divided heat generating layers generate heat. An image on the recording material is heated by the divided heat generating layers. The current monitoring sensor is configured to monitor a current flowing through the above-described one of the divided heating generating layers.

Electromagnetic induction image heating apparatus having a current monitoring sensor

A cylindrical fixing member for use with a fixing device includes a heat generating layer and an electrode layer contacting the heat generating layer. The electrode layer is smaller in volume resistance value than the heat generating layer. The electrode layer is formed in a helical shape so that a helical axis thereof extends in a direction along a generatrix direction of the fixing member. One end and the other end of the electrode layer are electrically open.

Cylindrical fixing member, fixing device and image forming apparatus

A fixing device fixes an image onto a recording material. The recording material is fed through and heated in a nip to fix the image. A nip plate is provided with a projection in a region downstream of the nip with respect to a feeding direction of the recording material, the projection projecting toward a roller and extending in a longitudinal direction of a cylindrical belt. The nip plate has a recess on a side opposite from an outside provided with the projection at a position corresponding to that of the projection with respect to the feeding direction, the recess extending in the longitudinal direction of the cylindrical belt. At least a part of one of the two end portions of a supporting member overlaps the recess of the nip plate with respect to the feeding direction of the recording material and a longitudinal direction of the cylindrical belt.

Fixing device for fixing an image on a recording material and having a nip plate with a projection that projects towards a roller

A fixing device for fixing an image on a recording material. A heater radiates radiant light to heat a nip plate. A roller cooperative with the nip plate forms a nip between a cylindrical belt and an outer peripheral surface of the roller. A recording material carrying the image is fed through and heated in the nip to fix the image on the recording material. The nip plate has a projection in a region downstream of the nip with respect to a feeding direction of the recording material. At least a part of one of the two end portions of a supporting member overlaps the projection of the nip plate with respect to the feeding direction of the recording material and the longitudinal direction of the cylindrical belt to support the projection. A spacer is provided between the projection and at least part of one of the two end portions.

Fixing device for fixing an image on a recording material and having a spacer between a projection of a nip plate and portions of a supporting member

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Mishima, Japan

Takaaki Tsuruya