# US 2001/0022299 A1 · Fixing device using induction heating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2001/0022299 A1 - Document ID: US20010022299A1 - Status: Published application - Kind: A1 - Application number: 09/853,698 - Filed: 2001-05-14 - Published: 2001-09-20 - Earliest claimed: 1999-12-28 - Assignees: Toshiba Tec Kabushiki Kaisha - Inventors: Osamu Takagi; Satoshi Kinouchi - Web page: https://patentgrep.com/patent/US20010022299A1 ## CPC - G03G 15/2053: {Structural details of heat elements, e.g. structure of roller or belt, eddy current, induction heating} - H05B 6/145: {Heated rollers} - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract An electrophotography fixing device has a heating roller and an induction heating device. In order to improve heat resistance, heat radiating performance and insulation performance and in order to appropriately uniformly heat the heating roller, in the induction heating device, induction heating coils wound onto a core are fixed by varnish mixed with mica, and the outside surfaces thereof are fixed by a heat resistant bundling band or a molded body of a heat resistant material, or coated with a heat resistant, insulating and thermal conductive sheet. Alternatively, the same sheets as the above described sheet are provided between the core and the coils and between the layers of the coils. In addition, the core is formed with a hole extending in axial directions or holes extending in directions perpendicular to the axial directions. Moreover, the coils are doubly insulated. ## Claims ### Claim 1 A fixing device using induction heating for causing alternating current to pass through electromagnetic induction coils, which are arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein the fixing of said electromagnetic induction coils to each other and the fixing of said core to said coils are carried out by an adhesive material mixed with mica. ### Claim 2 (depends on 1) A fixing device as set forth in claim 1, wherein said material is a heat resistant material which is resistant to 200° C. or higher. ### Claim 3 (depends on 1) A fixing device as set forth in claim 1, wherein said material is a polyimide resin. ### Claim 4 (depends on 1) A fixing device as set forth in claim 1, wherein said material is a single liquid resin. ### Claim 5 (depends on 1) A fixing device as set forth in claim 1, wherein said material is an epoxy resin. ### Claim 6 (depends on 1) A fixing device as set forth in claim 1, wherein said material is a silicone resin. ### Claim 7 (depends on 1) A fixing device as set forth in claim 1, wherein the mixing ratio of said mica to said material is 50% or less by weight. ### Claim 8 (depends on 1) A fixing device as set forth in claim 1, wherein said endless member is a roller. ### Claim 9 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said electromagnetic induction coil is wound onto a core of a non-magnetic material coated with a resin or paint. ### Claim 10 (depends on 9) A fixing device as set forth in claim 9, wherein said material is a heat resistant material which is resistant to 200° C. or higher. ### Claim 11 (depends on 9) A fixing device as set forth in claim 9, wherein said material is a polyimide resin. ### Claim 12 (depends on 9) A fixing device as set forth in claim 9, wherein said material is a single liquid resin. ### Claim 13 (depends on 9) A fixing device as set forth in claim 9, wherein said material is an epoxy resin. ### Claim 14 (depends on 9) A fixing device as set forth in claim 9, wherein said material is a silicone resin. ### Claim 15 (depends on 9) A fixing device as set forth in claim 9, wherein said material is mixed with mica powder. ### Claim 16 (depends on 15) A fixing device as set forth in claim 15, wherein the mixing ratio of said mica to said material is 50% or less by weight. ### Claim 17 (depends on 9) A fixing device as set forth in claim 9, wherein said endless member is a roller. ### Claim 18 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said coil is wound around a first axis, and said coil thus wound is fixed by winding a heat resistant bundling band onto said coil around a second axis substantially perpendicular to said first axis. ### Claim 19 (depends on 18) A fixing device as set forth in claim 18, wherein said endless member is a roller. ### Claim 20 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said coil is wound around a first axis, and said coil thus wound is fixed by a molded body of a heat resistant material having a member wound onto said coil around an axis perpendicular to at least said first axis. ### Claim 21 (depends on 20) A fixing device as set forth in claim 20, wherein said endless member is a roller. ### Claim 22 A fixing device using induction heating for causing alternating current to pass through electromagnetic induction coils, which are arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein a heat resistant, insulating and heat conductive sheet for providing both of heat radiation and insulation of said coils is provided on the surfaces of said coils. ### Claim 23 (depends on 22) A fixing device as set forth in claim 22, wherein said coils are wound in the form of multilayer, and said sheet is provided between adjacent two of said coils serving as vertically adjacent two layers and/or on the surfaces of said coils. ### Claim 24 (depends on 22) A fixing device as set forth in claim 22, wherein said endless member is a roller. ### Claim 25 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said coil is wound onto a core of a non-magnetic material, and a heat resistant, insulating and heat conductive sheet for providing both of heat radiation and insulation of said coils is provided between the surface of said core and said coil. ### Claim 26 (depends on 25) A fixing device as set forth in claim 25, wherein said endless member is a roller. ### Claim 27 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein the center of said coil in axial directions is offset from the center of said endless member, which serves as an object to be heated, in axial directions in accordance with thermal load of said endless member. ### Claim 28 (depends on 27) A fixing device as set forth in claim 27, wherein said endless member is a roller. ### Claim 29 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said coil is wound onto a core of a non-magnetic material, and said core has a hole extending in directions substantially perpendicular to the axis of said core. ### Claim 30 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said coil is wound onto a core of a non-magnetic material, and said core has a first hole extending in the axial directions of said core. ### Claim 31 (depends on 30) A fixing device as set forth in claim 30, wherein said hole passes through said core. ### Claim 32 (depends on 30) A fixing device as set forth in claim 30, wherein said core has a second hole extending in directions substantially perpendicular to the axis of said core. ### Claim 33 (depends on 30) A fixing device as set forth in claim 30, which further comprises blowing means for blowing into said first hole. ### Claim 34 A fixing device using induction heating for causing alternating current to pass through an electromagnetic induction coil, which is arranged so as to be close to an endless member having a metal layer of a conductive material, to cause said endless member to generate heat to heat a member to be fixed, wherein said coil has a plurality of unit wires, each of which comprises a conductor coated with a first insulating coating, and said plurality of unit wires are coated with a second insulating coating to doubly isolate said coil from said endless member.