Canon Kabushiki Kaisha

Matsutaka Maeda

Yuji Kitano

Makoto Souma

Yasuhiro Miyahara

Katsuhisa Matsunaka

Mamo Matsumoto

Takaaki Tsuruya

Akira Okano

Yasuharu Notoya

Naoko Kasai

Yoshihito Oshima

Yutaro Yoshida

Shigeo Kuroda

Takeshi Suzuki

Hiroki Muramatsu

Katsuya Abe

Yo Imaizumi

Masaaki Takahashi

Toshinori Nakayama

Nobuhiro Ito

Kazuo Kishino

Toshitami Hara

Akeshi Asaka

Masayuki Tamaki

Naoki Akiyama

Hiroto Sugimoto

Kota Arimoto

Tomohiro Saito

Takuji Oishi

Yusuke Baba

Noriaki Kobayashi

Yusuke Yamaguchi

Ryo Yashiro

Akane Kuboyama

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 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

A liquid silicone rubber composition contains metallic silicon particles. The content of the metallic silicon particles is 35% by volume or more and 45% by volume or less. The volume average particle diameter of the metallic silicon particles is 1 μm or more and 20 μm or less. The ratio A/B of viscosity A at a shear rate of 0.02/sec to viscosity B at a shear rate of 1/sec of the composition is 2.0 or less.

Silicone rubber composition

An electrophotographic member having an endless shape comprises: a substrate; and an elastic layer on an outer peripheral surface thereof. The elastic layer contains a silicone rubber and metal silicon fillers dispersed in the silicone rubber. An average of area ratios of the metal silicon fillers in respective first binarized images is 42% or less, and an average of area ratios of the metal silicon fillers in respective second binarized images is 42% or less. The elastic layer has λ of 1.30 W/(m·K) or more, where λ is a thermal conductivity of the elastic layer in a thickness direction thereof, and the elastic layer has ρV of 9.0 LOG Ω·cm or more, where ρV is a common logarithm value of a volume resistivity thereof.

Electrophotographic member and heat fixing device

A fixing member includes a substrate having an endless shape; and an elastic layer on an outer peripheral surface of the substrate, the elastic layer containing a silicone rubber and fillers dispersed in the silicone rubber, a content of the fillers with respect to the elastic layer being 35 vol % or more and 50 vol % or less. The fillers includes at least a first filler and a second filler. The first filler is at least one selected from the group consisting of: magnesium oxide; and zinc oxide. The second filler is at least one selected from the group consisting of metal silicon and silicon carbide. A proportion of a sum of the first filler and the second filler to a total amount of the fillers in the elastic layer is 90 vol % or more. Further, the average of 6 sets of representative coefficient A is 1.4 or more.

Fixing member and heat fixing device

An electrophotographic member comprising a base body and an elastic layer on the base body, the elastic layer including silicone rubber and metallic silicon particles in the silicone rubber; wherein the metallic silicon particles have a mass reduction rate of 0.05% or more.

Electrophotographic member and method for manufacturing the same, thermal fixing apparatus, and electrophotographic image forming apparatus

A fixing member for electrophotography having an endless shape has a base layer having an endless shape, and an elastic layer on the outer circumferential surface of the base layer. The elastic layer includes a silicone rubber and a filler dispersed in the silicone rubber. The total amount of the filler compounded in the elastic layer is 30 vol % or less based on the total volume of the elastic layer. The elastic layer satisfies the relation of &#x3bb;td&#x3e;&#x3bb;md&#x3e;&#x3bb;nd. &#x3bb;td is a thermal conductivity of the elastic layer in the circumferential direction, &#x3bb;nd is a thermal conductivity of the elastic layer in the thickness direction, and &#x3bb;md, is a thermal conductivity of the elastic layer in the longitudinal direction. &#x3bb;td is 2.0 W/(m&#xb7;K) or more, and &#x3bb;nd is 1.3 W/(m&#xb7;K) or more.

Fixing member and heat fixing apparatus

Provided is an electrophotographic fixing member including an elastic layer having a low hardness while maintaining a high thermal conductivity and a high strength, the elastic layer being less liable to fracture even when repeatedly compressed in a high-temperature state. The fixing member for electrophotography includes a substrate, an elastic layer on the substrate, and a surface layer in the stated order, wherein the elastic layer contains a silicone rubber and a heat conductive filler dispersed in the silicone rubber, wherein the heat conductive filler is metal oxide particles, or metal particles each having a surface at least part of which is formed of a metal oxide, and wherein the elastic layer further contains a charge control agent negatively chargeable with respect to the heat conductive filler.

Electrophotographic fixing member, fixing device, and electrophotographic image forming apparatus

An electrophotographic fixing member having an elastic layer that is high in thermal conductivity in the thickness direction, resists causing fracture or plastic deformation even by repeated compression in a high temperature state, and is low in hardness. The electrophotographic fixing member has a substrate, and an elastic layer provided on the substrate, wherein the elastic layer contains a filler containing an inorganic oxide and is provided on an outer circumference of the substrate, wherein (1) in a binarized image on a first cross-section in a thickness-circumferential direction of the elastic layer and a binarized image on a second cross-section in a thickness-axial direction of the elastic layer, 1.0&#x2264;(A/B)&#x2264;2.0 and 0.40&#x2264;(A+B)&#x2264;0.50 are satisfied; and (2) 50&#xb0;&#x2264;&#x3b8;&#x2264;90&#xb0; is satisfied.

Fixing member, heat fixing apparatus, and image forming apparatus

Provided is a fixing member having excellent heat resistance and durability. The fixing member includes a substrate and an elastic layer on the substrate, wherein the elastic layer includes: rubber, thermally conductive particles dispersed in the rubber, and iron oxide particles dispersed in the rubber, a content of the thermally conductive particles in the elastic layer is 30% by volume or more and 50% by volume or less, a content of the iron oxide particles in the elastic layer is 0.01% by volume or more and 1.0% by volume or less, the thermally conductive particles are at least one selected from the group consisting of aluminum oxide, metal silicon, magnesium oxide, zinc oxide, and silicon carbide, and the iron oxide particles have a localization index M of 0.2 or more and less than 0.8, wherein the localization index M is determined by specific steps.

An electrophotographic member including: a base member; an elastic layer having a thickness of from 100 &#x3bc;m to 500 &#x3bc;m, and containing a cured product of an addition-curable silicone rubber composition; and a cured product layer arranged between the base member and the elastic layer, the cured product layer containing a cured product of a composition containing an organopolysiloxane having a Si&#x2014;H group and a silane coupling agent having an alkenyl group. A peel adhesive strength between the elastic layer and the base member is a specific range. The elastic layer undergoes a cohesive failure in a peel test from the base member. The ratio (HU2/HU1) of a universal hardness HU2 on the inner surface of the elastic layer to a universal hardness HU1 at a position reached by cutting the elastic layer from its outer surface in its depth direction by 10 &#x3bc;m is a specific range.

Electrophotographic member and fixing device

Provided is a fixing member includes: a substrate; and an elastic layer on the substrate, wherein the elastic layer contains a rubber and fillers dispersed in the rubber, and wherein an average value of area ratios of large-particle diameter fillers is 20% or more and 40% or less, and the large-particle diameter fillers have an average array degree fof 0.00 or more and 0.15 or less, an average value of an area ratios of small-particle diameter fillers is 10% or more and 20% or less, the small-particle diameter fillers have an average array degree fof 0.20 or more and 0.50 or less, and the small-particle diameter fillers have an average array angle &#x3a6;of 60&#xb0; or more and 120&#xb0; or less.

Endless shaped fixing belt and heat fixing device having endless belt shape heating member

Provided is a fixing member for a heat fixing apparatus which can further improve utilization efficiency of heat for heat fixing of an unfixed toner. A fixing member having an endless belt shape includes a substrate and an elastic layer on the substrate, wherein the elastic layer includes silicone rubber and a filler dispersed in the silicone rubber, and when a thermal conductivity of the elastic layer in a thickness direction is defined as &#x3bb;nd, a thermal conductivity of the elastic layer in a circumferential direction is defined as &#x3bb;td, and a thermal conductivity of the elastic layer in a width direction is defined as &#x3bb;md, &#x3bb;nd is 1.30 W/(m&#xb7;K) or more, and &#x3bb;nd, &#x3bb;td, and &#x3bb;md satisfy a relationship as shown below &#x3bb;nd&#x3e;&#x3bb;md&#x3e;&#x3bb;td.

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Kawasaki, Japan

Matsutaka Maeda