Patents by Inventor Toru Imaizumi

Toru Imaizumi 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).

  • Publication number: 20210026280
    Abstract: A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.
    Type: Application
    Filed: October 14, 2020
    Publication date: January 28, 2021
    Inventors: Kensuke Umeda, Masashi Tanaka, Shoichiro Ikegami, Sho Taguchi, Ai Suzuki, Hikaru Osada, Toru Imaizumi
  • Publication number: 20210011404
    Abstract: In a fixing device according to the disclosure, a first surface of a restriction member is inclined so that, as the first surface goes further away from a nip portion, the first surface inclines toward a direction coming closer to an edge surface of the film, and the first surface is inclined so that, as the first surface comes downstream in the conveying direction, the first surface inclines toward a direction going further away from the edge surface of the film. A second surface is inclined so that, as the second surface comes closer to a center in the rotational axis direction of the film, the second surface inclines toward a direction coming closer to a roller, and inclines in a direction going downstream in the conveying direction.
    Type: Application
    Filed: September 25, 2020
    Publication date: January 14, 2021
    Inventors: Hikaru Osada, Toru Imaizumi
  • Patent number: 10838332
    Abstract: A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: November 17, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kensuke Umeda, Masashi Tanaka, Shoichiro Ikegami, Sho Taguchi, Ai Suzuki, Hikaru Osada, Toru Imaizumi
  • Patent number: 10824100
    Abstract: In a fixing device according to the disclosure, a first surface of a restriction member is inclined so that, as the first surface goes further away from a nip portion, the first surface inclines toward a direction coming closer to an edge surface of the film, and the first surface is inclined so that, as the first surface comes downstream in the conveying direction, the first surface inclines toward a direction going further away from the edge surface of the film. A second surface is inclined so that, as the second surface comes closer to a center in the rotational axis direction of the film, the second surface inclines toward a direction coming closer to a roller, and inclines in a direction going downstream in the conveying direction.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: November 3, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hikaru Osada, Toru Imaizumi
  • Patent number: 10635032
    Abstract: Image data of an image formed on a recording material includes a plurality of picture elements. A predetermined number of picture elements which is a portion of the image data are converted as one region to thereby convert the image data to conversion data including a plurality of regions. A value related to a print ratio in each of the regions of the conversion data is analyzed to acquire a value related to connection indicating how continuously regions in which the value related to the print ratio exceeds a threshold are adjacent to each other. Energization of the heat generating element is controlled on the basis of the temperature detected by the temperature detection portion and a control target temperature calculated from the value related to the connection.
    Type: Grant
    Filed: February 4, 2019
    Date of Patent: April 28, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toru Imaizumi, Sho Taguchi
  • Patent number: 10564579
    Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: February 18, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
  • Patent number: 10558153
    Abstract: 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: Grant
    Filed: September 8, 2017
    Date of Patent: February 11, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohei Wakatsu, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda
  • Patent number: 10503105
    Abstract: 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: Grant
    Filed: January 11, 2019
    Date of Patent: December 10, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
  • Publication number: 20190346796
    Abstract: An image forming apparatus, includes: a fixing portion configured to fix a toner image formed according to printing image data on a recording medium; an image processing portion configured to obtain reference image data according to the printing image data and a prescribed image pattern, and determines a target temperature on the basis of the reference image data, the reference image data being used as a reference for determining the target temperature at which the temperature of the fixing portion is maintained; and an electric power control portion configured to control electric power to be supplied to the fixing portion so that the temperature of the fixing portion is maintained at the target temperature.
    Type: Application
    Filed: April 30, 2019
    Publication date: November 14, 2019
    Inventor: Toru Imaizumi
  • Patent number: 10429783
    Abstract: In a fixing apparatus, a width of a first portion of a first heat generating resistor is narrower than a width of a second portion, at least a portion of an outline of the first portion on the near side with respect to a power shut-off member is provided at a position closer to the power shut-off member than an outline of the second portion on the near side with respect to the power shut-off member, and at least a portion of an outline of the first portion on the far side with respect to the power shut-off member is provided at a position closer to the power shut-off member than an outline of the second portion on the far side with respect to the power shut-off member.
    Type: Grant
    Filed: March 27, 2018
    Date of Patent: October 1, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toru Imaizumi, Hikaru Osada, Nozomu Nakajima, Shoichiro Ikegami
  • Publication number: 20190243292
    Abstract: Image data of an image formed on a recording material includes a plurality of picture elements. A predetermined number of picture elements which is a portion of the image data are converted as one region to thereby convert the image data to conversion data including a plurality of regions. A value related to a print ratio in each of the regions of the conversion data is analyzed to acquire a value related to connection indicating how continuously regions in which the value related to the print ratio exceeds a threshold are adjacent to each other. Energization of the heat generating element is controlled on the basis of the temperature detected by the temperature detection portion and a control target temperature calculated from the value related to the connection.
    Type: Application
    Filed: February 4, 2019
    Publication date: August 8, 2019
    Inventors: Toru Imaizumi, Sho Taguchi
  • Publication number: 20190196373
    Abstract: In a fixing device according to the disclosure, a first surface of a restriction member is inclined so that, as the first surface goes further away from a nip portion, the first surface inclines toward a direction coming closer to an edge surface of the film, and the first surface is inclined so that, as the first surface comes downstream in the conveying direction, the first surface inclines toward a direction going further away from the edge surface of the film. A second surface is inclined so that, as the second surface comes closer to a center in the rotational axis direction of the film, the second surface inclines toward a direction coming closer to a roller, and inclines in a direction going downstream in the conveying direction.
    Type: Application
    Filed: December 19, 2018
    Publication date: June 27, 2019
    Inventors: Hikaru Osada, Toru Imaizumi
  • Publication number: 20190171145
    Abstract: 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: Application
    Filed: January 11, 2019
    Publication date: June 6, 2019
    Inventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
  • Patent number: 10310424
    Abstract: 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: Grant
    Filed: December 20, 2017
    Date of Patent: June 4, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koji An, Takashi Narahara, Takeshi Shinji, Toru Imaizumi, Kazuhiro Doda, Kohei Wakatsu
  • Publication number: 20190155202
    Abstract: An image forming apparatus for forming an image on a recording material includes an image forming portion configured to form the image on the recording material; a fixing portion including a flexible cylindrical rotatable member and a roller configured to form a fixing nip, in which the recording material on which the image is formed is nipped and fed, in press-contact with the rotatable member and configured to fix the image on the recording material; an oblique movement detecting portion configured to detect oblique movement of the recording material; and a controller. When the oblique movement detecting portion detects the oblique movement of the recording material, the controller executes control for increasing a feeding interval of the recording material to the image forming portion.
    Type: Application
    Filed: November 16, 2018
    Publication date: May 23, 2019
    Inventors: Toru Imaizumi, Hikaru Osada
  • Patent number: 10268145
    Abstract: A fixing device includes a cylindrical film having an inner surface and a plate-like heater that extends in a longitudinal direction of the film, with the heater having (i) a first surface that contacts the inner surface of the film, and (ii) a second surface opposite to the first surface. The fixing device further includes a heat conduction plate that extends in the longitudinal direction of the film and contacts the second surface of the heater, and a supporting member that supports the heater through the heat conduction plate. An image that is formed on a recording material is heated by heat from the heater through the film.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: April 23, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Atsutoshi Ando, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima
  • Patent number: 10216130
    Abstract: 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: Grant
    Filed: June 15, 2016
    Date of Patent: February 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toru Imaizumi, Ken Nakagawa, Takashi Narahara, Takeshi Shinji, Kazuhiro Doda, Kohei Wakatsu
  • Publication number: 20190004460
    Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.
    Type: Application
    Filed: September 5, 2018
    Publication date: January 3, 2019
    Inventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
  • Patent number: 10095165
    Abstract: A fixing apparatus for fixing a toner image to a recording material includes a cylindrical film, a heater configured to make contact with the film, the heater including a substrate and a heat generation resistor formed on the substrate, and a heat conduction member configured to make contact with a surface of the heater opposite to a surface thereof being in contact with the film, the heat conduction member having a higher thermal conductivity than that of the substrate, and being divided into parts in a generatrix direction of the film. The toner image formed on the recording material is fixed on the recording material by using heat of the film, and one of the parts of the heat conduction member is configured to make contact with the heater continuously from a center to an end of a heat generation region of the heater in the generatrix direction.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: October 9, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kenichi Ogawa, Takashi Narahara, Toru Imaizumi, Yasuhito Minamishima, Tsuguhiro Yoshida, Masashi Tanaka, Kensuke Umeda
  • Publication number: 20180284664
    Abstract: In a fixing apparatus, a width of a first portion of a first heat generating resistor is narrower than a width of a second portion, at least a portion of an outline of the first portion on the near side with respect to a power shut-off member is provided at a position closer to the power shut-off member than an outline of the second portion on the near side with respect to the power shut-off member, and at least a portion of an outline of the first portion on the far side with respect to the power shut-off member is provided at a position closer to the power shut-off member than an outline of the second portion on the far side with respect to the power shut-off member.
    Type: Application
    Filed: March 27, 2018
    Publication date: October 4, 2018
    Inventors: Toru Imaizumi, Hikaru Osada, Nozomu Nakajima, Shoichiro Ikegami