Patents by Inventor Tsuguhiro Yoshida
Tsuguhiro Yoshida has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240069476Abstract: A fixing device includes a cylindrical fixing member, a heater arranged in an inner space of the fixing member, a pressing member to contact the fixing member and a conductive member disposed so as to contact an inner surface of the fixing member and to conduct the fixing member to a circuit for controlling a potential of the fixing member The fixing member heats an image on a recording material to fix the image onto the recording material while nipping and conveying the recording material between the fixing member and the pressing member. The conductive member is formed of metal wire.Type: ApplicationFiled: June 13, 2023Publication date: February 29, 2024Inventors: AKINORI YOKOTA, OSAMU SASAOKA, TSUGUHIRO YOSHIDA
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Publication number: 20230400803Abstract: 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.Type: ApplicationFiled: August 28, 2023Publication date: December 14, 2023Inventors: Kazuhiro Doda, Ken Nakagawa, Tsuguhiro Yoshida, Yutaka Sato, Kohei Wakatsu
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Patent number: 11835896Abstract: A fixing device includes a substrate, a first heat generator, a second heat generator with a length in a longitudinal direction of the substrate equal to a length of the first heat generator; and a third heat generator with a length shorter than the lengths of the first and second heat generators, a soaking member with a positioning portion in the longitudinal direction. In a short side direction of the substrate, the first heat generator is arranged at one end side, the second heat generator is arranged at the other end side, and the third heat generator is arranged between the first and second heat generators. The soaking member is arranged between the heater and a holder in a thickness direction. As seen in the short side direction, the positioning portion is positioned outside of an area corresponding to the third heat generator and inside of an area corresponding to the first heat generator.Type: GrantFiled: August 5, 2022Date of Patent: December 5, 2023Assignee: Canon Kabushiki KaishaInventors: Tsuguhiro Yoshida, Kohei Wakatsu
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Patent number: 11774889Abstract: 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.Type: GrantFiled: February 10, 2022Date of Patent: October 3, 2023Assignee: Canon Kabushiki KaishaInventors: Kazuhiro Doda, Tsuguhiro Yoshida, Atsushi Nakamoto, Shoichiro Ikegami
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Patent number: 11774891Abstract: 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.Type: GrantFiled: August 9, 2022Date of Patent: October 3, 2023Assignee: Canon Kabushiki KaishaInventors: Kazuhiro Doda, Ken Nakagawa, Tsuguhiro Yoshida, Yutaka Sato, Kohei Wakatsu
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Publication number: 20230259057Abstract: 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.Type: ApplicationFiled: April 25, 2023Publication date: August 17, 2023Inventors: Kazuhiro Doda, Tsuguhiro Yoshida, Kohei Wakatsu
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Publication number: 20230236530Abstract: An image-forming apparatus includes a rotatable developer-bearing member to bear a developer composed of a toner particle and a transfer promoting particle attached to the toner particle. When F denotes pressing force for pressing the developer-bearing member against an image-bearing member, and N denotes a total number of the transfer promoting particles interposed between the toner particle and the image-bearing member, adhesion strength Ft between the transfer promoting particle and the toner particle measured by pressing the transfer promoting particle against the toner particle at a pressing force per unit transfer promoting particle F/N and adhesion strength Fdr between the transfer promoting particle and the image-bearing member measured by pressing the transfer promoting particle against the image-bearing member at the pressing force per unit transfer promoting particle F/N, satisfy Ft<Fdr.Type: ApplicationFiled: January 24, 2023Publication date: July 27, 2023Inventors: TSUGUHIRO YOSHIDA, SHUICHI TETSUNO, KOJI AN
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Patent number: 11669032Abstract: 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.Type: GrantFiled: November 2, 2021Date of Patent: June 6, 2023Assignee: Canon Kabushiki KaishaInventors: Kazuhiro Doda, Tsuguhiro Yoshida, Kohei Wakatsu
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Publication number: 20230065569Abstract: A fixing device includes a heater provided with a first heat generator on a substrate and a second heat generator of which a length in a longitudinal direction is shorter than that of the first heat generator, a temperature detector of the heater, a switch for switching a power supply path from an AC power source to the first heat generator or the second heat generator. A controller for controlling the switch to supply power to the first heat generator or the second heat generator. The controller executes a first control in which the switch supplies the power to the first heat generator, and switches a second control in which the switch supplies the power alternately to the first heat generator or the second heat generator when the detected temperature reaches a threshold temperature.Type: ApplicationFiled: August 9, 2022Publication date: March 2, 2023Inventors: Kohei Wakatsu, Tsuguhiro Yoshida
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Publication number: 20230067803Abstract: A fixing device includes a substrate, a first heat generator, a second heat generator with a length in a longitudinal direction of the substrate equal to a length of the first heat generator; and a third heat generator with a length shorter than the lengths of the first and second heat generators, a soaking member with a positioning portion in the longitudinal direction. In a short side direction of the substrate, the first heat generator is arranged at one end side, the second heat generator is arranged at the other end side, and the third heat generator is arranged between the first and second heat generators. The soaking member is arranged between the heater and a holder in a thickness direction. As seen in the short side direction, the positioning portion is positioned outside of an area corresponding to the third heat generator and inside of an area corresponding to the first heat generator.Type: ApplicationFiled: August 5, 2022Publication date: March 2, 2023Inventors: Tsuguhiro Yoshida, Kohei Wakatsu
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Patent number: 11579550Abstract: A fixing device includes a heater, a first rotatable member, a second rotatable member, and a heat equalizing member. In a case that a region including a center of the heat equalizing member with respect to a longitudinal direction is a first region, a region closer to an end of the heat equalizing member than the first region is with respect to the longitudinal direction is a second region, and a region closer to the end of the heat equalizing member than the second region is with respect to the longitudinal direction is a third region. When the heat equalizing member has thermal capacities per unit length in the first region, the second region, and the third region are C?, C? and C?, respectively, C?, C? and C? satisfy the following relationship: C?>C?, and C?>C?.Type: GrantFiled: September 9, 2021Date of Patent: February 14, 2023Assignee: Canon Kabushiki KaishaInventors: Atsushi Nakamoto, Tsuguhiro Yoshida
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Patent number: 11537066Abstract: An intermediate transfer belt has a first region and a second region in an outer circumferential surface thereof that is in contact with a blade. The first region has a first dynamic friction coefficient in a belt conveyance direction, and the second region has a second dynamic friction coefficient. The distance of the second region in the belt conveyance direction is less than the distance of the first region and is greater than the distance of a contact portion in which the blade is in contact with the intermediate transfer belt.Type: GrantFiled: December 9, 2021Date of Patent: December 27, 2022Assignee: Canon Kabushiki KaishaInventors: Keisuke Ishizumi, Shohei Ishio, Shinji Katagiri, Takayuki Tanaka, Tsuguhiro Yoshida, Shuichi Tetsuno
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Patent number: 11531294Abstract: 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.Type: GrantFiled: November 29, 2021Date of Patent: December 20, 2022Assignee: Canon Kabushiki KaishaInventors: Tsuguhiro Yoshida, Kohei Wakatsu, Kazuhiro Doda, Yutaka Sato, Ken Nakagawa
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Publication number: 20220390882Abstract: 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.Type: ApplicationFiled: August 9, 2022Publication date: December 8, 2022Inventors: Kazuhiro Doda, Ken Nakagawa, Tsuguhiro Yoshida, Yutaka Sato, Kohei Wakatsu
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Patent number: 11507001Abstract: 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.Type: GrantFiled: July 8, 2021Date of Patent: November 22, 2022Assignee: Canon Kabushiki KaishaInventors: Tsuguhiro Yoshida, Kazuhiro Doda, Kohei Wakatsu
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Publication number: 20220299912Abstract: A heating apparatus includes a tubular film, a heater, a first support member including a first regulation surface, and configured to rotatably support a first end of the film, a second support member including a second regulation surface, and configured to rotatably support a second end of the film, and a holding unit configured to hold the heater and determine a position of the heater in the longitudinal direction. Either one of the first support member and the second support member includes a positioning portion configured to determine a position of the holding unit in the longitudinal direction.Type: ApplicationFiled: March 9, 2022Publication date: September 22, 2022Inventors: Tsuguhiro Yoshida, Atsushi Nakamoto, Toshiyuki Watanabe
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Patent number: 11442385Abstract: 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.Type: GrantFiled: June 21, 2021Date of Patent: September 13, 2022Assignee: Canon Kabushiki KaishaInventors: Kazuhiro Doda, Ken Nakagawa, Tsuguhiro Yoshida, Yutaka Sato, Kohei Wakatsu
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Publication number: 20220253006Abstract: 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.Type: ApplicationFiled: February 10, 2022Publication date: August 11, 2022Inventors: Kazuhiro Doda, Tsuguhiro Yoshida, Atsushi Nakamoto, Shoichiro Ikegami
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Publication number: 20220100126Abstract: An intermediate transfer belt has a first region and a second region in an outer circumferential surface thereof that is in contact with a blade. The first region has a first dynamic friction coefficient in a belt conveyance direction, and the second region has a second dynamic friction coefficient. The distance of the second region in the belt conveyance direction is less than the distance of the first region and is greater than the distance of a contact portion in which the blade is in contact with the intermediate transfer belt.Type: ApplicationFiled: December 9, 2021Publication date: March 31, 2022Inventors: Keisuke Ishizumi, Shohei Ishio, Shinji Katagiri, Takayuki Tanaka, Tsuguhiro Yoshida, Shuichi Tetsuno
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Publication number: 20220100128Abstract: A fixing device includes a heater, a first rotatable member, a second rotatable member, and a heat equalizing member. In a case that a region including a center of the heat equalizing member with respect to a longitudinal direction is a first region, a region closer to an end of the heat equalizing member than the first region is with respect to the longitudinal direction is a second region, and a region closer to the end of the heat equalizing member than the second region is with respect to the longitudinal direction is a third region. When the heat equalizing member has thermal capacities per unit length in the first region, the second region, and the third region are C?, C? and C?, respectively, C?, C? and C? satisfy the following relationship: C?>C?, and C?>C?.Type: ApplicationFiled: September 9, 2021Publication date: March 31, 2022Inventors: Atsushi Nakamoto, Tsuguhiro Yoshida