Patents by Inventor Takeshi Shinji
Takeshi Shinji 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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Patent number: 10558153Abstract: A fixing device includes a cylindrical film including a heat generating layer, a first temperature detecting member contacting the film, and a second temperature detecting member contacting the film and provided at such a position that a temperature change at the position, at which the second temperature detecting member is provided, is slower in responsiveness than at a position at which the first temperature detecting member is provided. A controller stops supply of electrical power to the film depending on a difference between a detection temperature value output by the first temperature detecting member, and a detection temperature value output by the second temperature detecting member. In addition, a toner image, formed on a recording material, is heated by heat from the film and is fixed on the recording material.Type: GrantFiled: September 8, 2017Date of Patent: February 11, 2020Assignee: Canon Kabushiki KaishaInventors: Kohei Wakatsu, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda
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Publication number: 20200033774Abstract: A fixing apparatus includes a heating member, a supporting member that supports the heating member, a film slidably disposed on the heating member, and a pressing member that forms a nip portion, in collaboration with the film, through which the recording medium is conveyed. The fixing apparatus further includes a first thermally conductive member and a second thermally conductive member that are disposed between the heating member and the supporting member. The first thermally conductive member has a thermal conductivity higher than that of a substrate of the heating member. The thermal conductivity in in-plane directions of the second thermally conductive member is higher than the thermal conductivity in a thickness direction thereof. The second thermally conductive member is in contact with the heating member, and the first thermally conductive member is in contact with the second thermally conductive member.Type: ApplicationFiled: July 18, 2019Publication date: January 30, 2020Inventors: Takeshi Shinji, Satoshi Nishida, Isamu Takeda
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Patent number: 10503105Abstract: A tubular film used for a fixing apparatus includes a heat generating layer, and a first conductive layer and a second conductive layer respectively provided at one end and another end of the film in a longitudinal direction of the film so as to contact the heat generating layer. The first conductive layer and the second conductive layer each has a volume resistivity that is less than that of the heat generating layer. A low resistance layer is formed in an area of the heat generating layer between the first conductive layer and the second conductive layer in the longitudinal direction, so as not to contact the first conductive layer and the second conductive layer. The low resistance layer has a volume resistivity that is less than that of the heat generating layer, and extends in a circumferential direction of the heat generating layer.Type: GrantFiled: January 11, 2019Date of Patent: December 10, 2019Assignee: Canon Kabushiki KaishaInventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
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Patent number: 10474074Abstract: A film for use in a fixing device includes a base layer having a cylindrical shape. An electrode portion is formed at an end part of the base layer in a longitudinal direction of the film. A heat generation portion is formed at a central part of the base layer in the longitudinal direction of the film and electrically connected to the electrode portion. The heat generation portion is formed of a conductive layer made of a same material as a material of the electrode portion. A thickness of the conductive layer is larger in the electrode portion than in the heat generation portion. A surface area of the conductive layer per unit length in the longitudinal direction of the film is larger in the electrode portion than in the heat generation portion.Type: GrantFiled: January 3, 2019Date of Patent: November 12, 2019Assignee: Canon Kabushiki KaishaInventors: Takeshi Shinji, Takashi Narahara, Kazuhiro Doda, Yutaka Sato, Kohei Wakatsu
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Publication number: 20190171145Abstract: A tubular film used for a fixing apparatus includes a heat generating layer, and a first conductive layer and a second conductive layer respectively provided at one end and another end of the film in a longitudinal direction of the film so as to contact the heat generating layer. The first conductive layer and the second conductive layer each has a volume resistivity that is less than that of the heat generating layer. A low resistance layer is formed in an area of the heat generating layer between the first conductive layer and the second conductive layer in the longitudinal direction, so as not to contact the first conductive layer and the second conductive layer. The low resistance layer has a volume resistivity that is less than that of the heat generating layer, and extends in a circumferential direction of the heat generating layer.Type: ApplicationFiled: January 11, 2019Publication date: June 6, 2019Inventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
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Patent number: 10310424Abstract: A fixing device includes a cylindrical film including a heat generating layer and an electroconductive layer electrically connected with the heat generating layer. A volume resistivity of the electroconductive layer is less than a volume resistivity of the heat generating layer. The fixing device further includes an energizing member, a roller, a sliding member, and a supporting member. A thermal conductivity of the sliding member is greater than a thermal conductivity of the supporting member. A recording material on which a toner image is formed is heated while being fed through a nip. A longitudinal end of the sliding member is positioned between an inner end surface and an outer end surface of the electroconductive layer with respect to the longitudinal direction of the film.Type: GrantFiled: December 20, 2017Date of Patent: June 4, 2019Assignee: Canon Kabushiki KaishaInventors: Koji An, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda, Kohei Wakatsu
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Publication number: 20190137915Abstract: A film for use in a fixing device includes a base layer having a cylindrical shape. An electrode portion is formed at an end part of the base layer in a longitudinal direction of the film. A heat generation portion is formed at a central part of the base layer in the longitudinal direction of the film and electrically connected to the electrode portion. The heat generation portion is formed of a conductive layer made of a same material as a material of the electrode portion. A thickness of the conductive layer is larger in the electrode portion than in the heat generation portion. A surface area of the conductive layer per unit length in the longitudinal direction of the film is larger in the electrode portion than in the heat generation portion.Type: ApplicationFiled: January 3, 2019Publication date: May 9, 2019Inventors: Takeshi Shinji, Takashi Narahara, Kazuhiro Doda, Yutaka Sato, Kohei Wakatsu
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Patent number: 10254687Abstract: A fixing apparatus includes a heating rotating member, a pressure rotating member, and a contact member. A contact holding member holds the contact member so that the contact member presses against the heating rotating member, and causes at least a portion of the contact member to elastically deform between the heating rotating member and the contact holding member. In addition, a displacement mechanism displaces a relative position of the heating rotating member with respect to the pressure rotating member. When the heating rotating member is separated from the pressure rotating member by the displacement mechanism, an interval between a fulcrum, at which the contact holding member holds the contact member, and a contact point, at which the contact member comes into contact with the heating rotating member, does not increase.Type: GrantFiled: June 22, 2018Date of Patent: April 9, 2019Assignee: Canon Kabushiki KaishaInventors: Kohei Wakatsu, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Yutaka Sato
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Publication number: 20190094772Abstract: A fixing member used for a fixing device includes a tubular base layer; an electrode portion formed on the base layer; a heat generating portion formed on the base layer in such a manner as to be positioned next to the electrode portion in a longitudinal direction of the fixing member, the heat generating portion being electrically connected to the electrode portion; and an overcoat layer formed on the heat generating portion. The heat generating portion is a layer formed by a plurality of thin linear layers extending in the longitudinal direction of the fixing member and spaced from one another along a circumferential direction of the fixing member. The overcoat layer extends over a boundary between the heat generating portion and the electrode portion in the longitudinal direction of the fixing member.Type: ApplicationFiled: November 27, 2018Publication date: March 28, 2019Inventors: Yutaka Sato, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
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Patent number: 10216130Abstract: A tubular film used for a fixing apparatus includes a heat generating layer, and a first conductive layer and a second conductive layer provided respectively at one end and another end of the film in a longitudinal direction of the film so as to contact the heat generating layer. The first conductive layer and the second conductive layer both have a lower volume resistivity than that of the heat generating layer. A low-resistance layer is formed in an area of the heat generating layer between the first conductive layer and the second conductive layer in the longitudinal direction so as not to contact the first conductive layer and the second conductive layer. The low-resistance layer has a lower volume resistivity than that of the heat generating layer and extends in a circumferential direction of the heat generating layer.Type: GrantFiled: June 15, 2016Date of Patent: February 26, 2019Assignee: Canon Kabushiki KaishaInventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
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Patent number: 10209655Abstract: A film for use in a fixing device includes a base layer having a cylindrical shape. An electrode portion is formed at an end part of the base layer in a longitudinal direction of the film. A heat generation portion is formed at a central part of the base layer in the longitudinal direction of the film and electrically connected to the electrode portion. The heat generation portion is formed of a conductive layer made of a same material as a material of the electrode portion. A thickness of the conductive layer is larger in the electrode portion than in the heat generation portion. A surface area of the conductive layer per unit length in the longitudinal direction of the film is larger in the electrode portion than in the heat generation portion.Type: GrantFiled: April 25, 2017Date of Patent: February 19, 2019Assignee: Canon Kabushiki KaishaInventors: Takeshi Shinji, Takashi Narahara, Kazuhiro Doda, Yutaka Sato, Kohei Wakatsu
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Publication number: 20180373189Abstract: Provided is a fixing apparatus provided with a displacement mechanism 21 which displaces a relative position of a fixing film 1 which generates heat when energized, with respect to a pressure roller 3, wherein, when the fixing film is separated from the pressure roller by the displacement mechanism, an interval between a fulcrum at which a contact holding member 10 holds a contact member 9 and a contact at which the contact member 9 comes into contact with the fixing film 1 does not increase.Type: ApplicationFiled: June 22, 2018Publication date: December 27, 2018Inventors: Kohei Wakatsu, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Yutaka Sato
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Patent number: 10152007Abstract: A fixing member for a fixing device includes a cylindrical base layer, and a plurality of heat generating resistors extending in a longitudinal direction of the fixing member on the base layer and arranged with intervals in a circumferential direction of the base layer. Each of the plurality of heat generating resistors has a volume resistivity less than that of the base layer. The plurality of heat generating resistors includes a first heat generating resistor and a second heat generating resistor adjacent to each other in the circumferential direction, and the first heat generating resistor and the second heat generating resistor are at least partly overlapped in the circumferential direction.Type: GrantFiled: May 26, 2017Date of Patent: December 11, 2018Assignee: Canon Kabushiki KaishaInventors: Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Yutaka Sato, Kohei Wakatsu
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Publication number: 20180181039Abstract: A fixing device includes a cylindrical film including a heat generating layer and an electroconductive layer electrically connected with the heat generating layer. Volume resistivity of the electroconductive layer is lower than volume resistivity of the heat generating layer. The fixing device further includes an energizing member, a roller, a sliding member, and a supporting member. Thermal conductivity of the sliding member is higher than thermal conductivity of the supporting member. A recording material on which a toner image is formed is heated while being fed through a nip. A longitudinal end of the sliding member is positioned between an inner end surface and an outer end surface of the electroconductive layer with respect to the longitudinal direction of the film.Type: ApplicationFiled: December 20, 2017Publication date: June 28, 2018Inventors: Koji An, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda, Kohei Wakatsu
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Publication number: 20180173140Abstract: A tubular film used for a fixing apparatus, including: a heat generating layer; a first conductive layer and a second conductive layer provided respectively at one end and another end of the film in a longitudinal direction of the film so as to contact the heat generating layer, the first conductive layer and the second conductive layer both having a lower volume resistivity than the heat generating layer; and a low-resistance layer formed in an area of the heat generating layer between the first conductive layer and the second conductive layer in the longitudinal direction so as not to contact the first conductive layer and the second conductive layer, the low-resistance layer having a lower volume resistivity than the heat generating layer and extending in a circumferential direction of the heat generating layer.Type: ApplicationFiled: June 15, 2016Publication date: June 21, 2018Inventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
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Publication number: 20180074444Abstract: A fixing device includes a cylindrical film including a heat generating layer and configured to be supplied with electric power so that the heat generating layer generates heat; a first temperature detecting member contacting the film; a second temperature detecting member contacting the film and provided at such a position that temperature change at the position of the second temperature detecting member is slower in responsiveness than at a position of the first temperature detecting member; and a controller configured to control the electric power supplied to the film. A toner image formed on a recording material is heated by heat from the film and is fixed on the recording material. The controller stops supply of the electric power to the film depending on a difference value between detection temperatures of the first and second temperature detecting members.Type: ApplicationFiled: September 8, 2017Publication date: March 15, 2018Inventors: Kohei Wakatsu, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda
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Patent number: 9915897Abstract: A fixing device includes a heating member including a base layer, first and second electroconductive layers and a plurality of heat generating resistors provided on the base layer and having a volume resistivity smaller than a volume resistivity of the base layer; a temperature detecting member; and an electrode member. The heat generating resistors are provided helically around the base layer so that a helical axis thereof extends along the longitudinal direction of the rotatable member, and are disposed with intervals. One end and the other end of each of the heat generating resistors are electrically connected with the first and the second electroconductive layers, respectively. A temperature detecting region of the rotatable member by the temperature detecting member overlaps with the heat generating resistors.Type: GrantFiled: August 31, 2016Date of Patent: March 13, 2018Assignee: Canon Kabushiki KaishaInventors: Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda, Kohei Wakatsu
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Publication number: 20170343929Abstract: A fixing member for a fixing device, the fixing member includes a cylindrical base layer; and a plurality of heat generating resistors extending in a longitudinal direction of the fixing member on the base layer and arranged with intervals in a circumferential direction of the base layer, wherein heat generating resistors have volume resistivities lower than that of the base layer, the heat generating resistors include a first heat generating resistor and a second heat generating resistor adjacent to each other in the circumferential direction, and the first heat generating resistor and the second heat generating resistor are at least partly overlapped in the circumferential direction.Type: ApplicationFiled: May 26, 2017Publication date: November 30, 2017Inventors: Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Yutaka Sato, Kohei Wakatsu
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Publication number: 20170315484Abstract: A film for use in a fixing device includes a base layer having a cylindrical shape. An electrode portion is formed at an end part of the base layer in a longitudinal direction of the film. A heat generation portion is formed at a central part of the base layer in the longitudinal direction of the film and electrically connected to the electrode portion. The heat generation portion is formed of a conductive layer made of a same material as a material of the electrode portion. A thickness of the conductive layer is larger in the electrode portion than in the heat generation portion. A surface area of the conductive layer per unit length in the longitudinal direction of the film is larger in the electrode portion than in the heat generation portion.Type: ApplicationFiled: April 25, 2017Publication date: November 2, 2017Inventors: Takeshi Shinji, Takashi Narahara, Kazuhiro Doda, Yutaka Sato, Kohei Wakatsu
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Publication number: 20170060052Abstract: A fixing device includes a heating member including a base layer, first and second electroconductive layers and a plurality of heat generating resistors provided on the base layer and having a volume resistivity smaller than a volume resistivity of the base layer; a temperature detecting member; and an electrode member. The heat generating resistors are provided helically around the base layer so that a helical axis thereof extends along the longitudinal direction of the rotatable member, and are disposed with intervals. One end and the other end of each of the heat generating resistors are electrically connected with the first and the second electroconductive layers, respectively. A temperature detecting region of the rotatable member by the temperature detecting member overlaps with the heat generating resistors.Type: ApplicationFiled: August 31, 2016Publication date: March 2, 2017Inventors: Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda, Kohei Wakatsu