Patents by Inventor Masatsugu Toyonori

Masatsugu Toyonori 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).

  • Patent number: 10859951
    Abstract: An electrophotographic belt that, despite long-term usage, is not susceptible to unevenness in cleaning by a cleaning blade in a width direction. The electrophotographic belt has an endless shape and has grooves on an outer circumferential surface thereof, the grooves each extending in a circumferential direction of the electrophotographic belt, when equally dividing a groove-formed area of the outer circumferential surface into three areas in a direction orthogonal to the circumferential direction of the electrophotographic belt, and calculating average values of depths of the grooves contained in the three areas respectively to obtain Dm, De1 and De2, where Dm is an average value of depths of the grooves in a central area, De1 and De2 are average values of depths of the grooves contained in both ends areas, Dm, De1 and De2 satisfy equations (1) and (2): Dm<De1??(1) Dm<De2??(2).
    Type: Grant
    Filed: April 22, 2020
    Date of Patent: December 8, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yasuhiro Matsuo, Kouichi Uchida, Masatsugu Toyonori
  • Publication number: 20200341408
    Abstract: Provided an electrophotographic belt that, despite long-term usage, is not susceptible to unevenness in cleaning by a cleaning blade in a width direction.
    Type: Application
    Filed: April 22, 2020
    Publication date: October 29, 2020
    Inventors: Yasuhiro Matsuo, Kouichi Uchida, Masatsugu Toyonori
  • Patent number: 10551771
    Abstract: Provided is an electrophotographic belt sustainably excellent in toner removal performance. The electrophotographic belt has an endless shape and has grooves on an outer surface thereof, each of the grooves extending in a circumferential direction and being in non-parallel with the circumferential direction, and the outer surface is composed only of a first region in which the number of the grooves in a direction orthogonal to the circumferential direction is “n” and a second region in which the number of the grooves in the direction orthogonal to the circumferential direction is larger than the “n”, the first region and the second region being arranged alternately in the circumferential direction, and the “n” being an integer of 1 or more.
    Type: Grant
    Filed: April 8, 2019
    Date of Patent: February 4, 2020
    Assignee: CANON KABUSKIKI KAISHA
    Inventors: Kouichi Uchida, Koujirou Izumidate, Noriaki Egawa, Masatsugu Toyonori, Shuji Saito, Yasuhiro Matsuo, Takashi Endo, Kosuke Saito
  • Patent number: 10527972
    Abstract: An intermediate transfer belt includes, on a surface in contact with a photosensitive drum and a cleaning blade, a plurality of grooves formed along a moving direction of the intermediate transfer belt in a width direction which intersects the moving direction of the intermediate transfer belt. Further, the intermediate transfer belt includes a plurality of first regions in which adjacent grooves in the width direction are arranged at a predetermined interval, and a second region which is positioned between the plurality of first regions and in which an interval between adjacent grooves in the width direction is different from the predetermined interval. The second region is arranged outside, in the width direction of the intermediate transfer belt, a range in which a patch toner is to be formed in concentration correction.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: January 7, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shuji Saito, Ken Yokoyama, Noriaki Egawa, Koujirou Izumidate, Masatsugu Toyonori
  • Publication number: 20190332038
    Abstract: An intermediate transfer belt includes, on a surface in contact with a photosensitive drum and a cleaning blade, a plurality of grooves formed along a moving direction of the intermediate transfer belt in a width direction which intersects the moving direction of the intermediate transfer belt. Further, the intermediate transfer belt includes a plurality of first regions in which adjacent grooves in the width direction are arranged at a predetermined interval, and a second region which is positioned between the plurality of first regions and in which an interval between adjacent grooves in the width direction is different from the predetermined interval. The second region is arranged outside, in the width direction of the intermediate transfer belt, a range in which a patch toner is to be formed in concentration correction.
    Type: Application
    Filed: April 12, 2019
    Publication date: October 31, 2019
    Inventors: Shuji Saito, Ken Yokoyama, Noriaki Egawa, Koujirou Izumidate, Masatsugu Toyonori
  • Publication number: 20190324386
    Abstract: Provided is an electrophotographic belt sustainably excellent in toner removal performance. The electrophotographic belt has an endless shape and has grooves on an outer surface thereof, each of the grooves extending in a circumferential direction and being in non-parallel with the circumferential direction, and the outer surface is composed only of a first region in which the number of the grooves in a direction orthogonal to the circumferential direction is “n” and a second region in which the number of the grooves in the direction orthogonal to the circumferential direction is larger than the “n”, the first region and the second region being arranged alternately in the circumferential direction, and the “n” being an integer of 1 or more.
    Type: Application
    Filed: April 8, 2019
    Publication date: October 24, 2019
    Inventors: Kouichi Uchida, Koujirou Izumidate, Noriaki Egawa, Masatsugu Toyonori, Shuji Saito, Yasuhiro Matsuo, Takashi Endo, Kosuke Saito
  • Publication number: 20150098720
    Abstract: There is provided an image forming apparatus including: a rotatable photosensitive member; a rotatable charging brush for electrically charging the photosensitive member by injecting electric charges into a surface of the photosensitive member in contact with the surface of the photosensitive member; a power source for applying a voltage to the charging brush; a potential sensor for detecting a surface potential of the photosensitive member; an executing portion for causing the potential sensor to execute detection in such a manner that after a first potential which is the potential of the photosensitive member charged by applying a first voltage to the charging brush is detected by the potential sensor, the electric charges are removed from the photosensitive member by applying a second voltage smaller in absolute value than the first potential to the charging brush, and then a second potential which is the potential of the photosensitive member after removal of the electric charges is detected by the potent
    Type: Application
    Filed: December 16, 2014
    Publication date: April 9, 2015
    Inventors: Ryota Matsumoto, Koichi Hashimoto, Yuki Narumi, Masatsugu Toyonori
  • Patent number: 8948657
    Abstract: To provide a charging device and an image forming apparatus that can restrict generation of a winding-seam irregularity of a roll brush for a long period. A charging device 2 is configured so that, when first and second charging members 21a and 21b perform charging processing on a rotating photosensitive member 3, a region 40a on a surface of the photosensitive member 3 facing a winding seam 35a, which is a seam of a base cloth 31 serving as a base material of the first charging member 21a, is not superposed on a region 40b on the surface of the photosensitive member 3 facing a winding seam 35b, which is a seam of a base cloth 31 serving as a base material of the second charging member 21b.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: February 3, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masatsugu Toyonori, Ryota Matsumoto, Yuki Narumi, Koichi Hashimoto
  • Publication number: 20140064790
    Abstract: To provide a charging device and an image forming apparatus that can restrict generation of a winding-seam irregularity of a roll brush for a long period. A charging device 2 is configured so that, when first and second charging members 21a and 21b perform charging processing on a rotating photosensitive member 3, a region 40a on a surface of the photosensitive member 3 facing a winding seam 35a, which is a seam of a base cloth 31 serving as a base material of the first charging member 21a, is not superposed on a region 40b on the surface of the photosensitive member 3 facing a winding seam 35b, which is a seam of a base cloth 31 serving as a base material of the second charging member 21b.
    Type: Application
    Filed: November 8, 2013
    Publication date: March 6, 2014
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masatsugu Toyonori, Ryota Matsumoto, Yuki Narumi, Koichi Hashimoto
  • Patent number: 8200104
    Abstract: An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; a charger for electrically charging the image bearing member by contact of electroconductive magnetic particles carried on a magnetic particle carrying member with the image bearing member; a developing device for developing the electrostatic latent image into a toner image by supplying toner to the electrostatic latent image; a layer thickness detecting device for detecting a thickness of a surface layer of the image bearing member; a supplying device for supplying the magnetic particles to the magnetic particle carrying member with predetermined timing; and a control device for controlling a supply amount of the magnetic particles so that the supply amount of the magnetic particles supplied by the supplying device increases with an increase of an amount of change in thickness, in terms of an absolute value, of the surface layer obtained from a detection result of the layer thickness detecting device.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: June 12, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shingo Ito, Tetsuya Atsumi, Masatsugu Toyonori
  • Publication number: 20100226673
    Abstract: An image forming apparatus includes an image bearing member for bearing an electrostatic latent image; a charger for electrically charging the image bearing member by contact of electroconductive magnetic particles carried on a magnetic particle carrying member with the image bearing member; a developing device for developing the electrostatic latent image into a toner image by supplying toner to the electrostatic latent image; a layer thickness detecting device for detecting a thickness of a surface layer of the image bearing member; a supplying device for supplying the magnetic particles to the magnetic particle carrying member with predetermined timing; and a control device for controlling a supply amount of the magnetic particles so that the supply amount of the magnetic particles supplied by the supplying device increases with an increase of an amount of change in thickness, in terms of an absolute value, of the surface layer obtained from a detection result of the layer thickness detecting device.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 9, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Shingo Ito, Tetsuya Atsumi, Masatsugu Toyonori
  • Patent number: 7792447
    Abstract: An image heating apparatus for allowing a surface of a heated toner image borne on a recording material to be glossed without generating a batter in the heated toner image is provided. In an image heating apparatus (9) including heating means (11 and 12) for heating an unfixed toner image (ta) borne on a recording material (P) and pressure means (21 and 22) for pressurizing an unfixed toner image (tb) heated by the heating means to gloss a surface of the unfixed toner image, the pressure means includes: pressure force changing means (54L and 54R) for changing a pressure force when the pressure means pressurizes the unfixed toner image; temperature detecting means (51 and 52) for detecting a temperature of the pressure means; and pressurization control means (53).
    Type: Grant
    Filed: November 13, 2008
    Date of Patent: September 7, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masatsugu Toyonori, Tomohito Ishida, Tetsuya Atsumi, Isami Itoh
  • Patent number: 7751737
    Abstract: An image forming apparatus is provided in which on-surface potential unevenness of an image carrier can be suppressed, and with which an output image having excellent on-surface uniformity of color or the like can be obtained. The image forming apparatus includes: a photoconductive image carrier; charger which charges the image carrier; image exposing unit which exposes an image on a surface of the image carrier after the charging to form a latent electrostatic image; developing unit which develops the latent electrostatic image by adhering toner to the latent electrostatic image to form a toner image; and transfer charger which transfers the obtained toner image to a final supporting member such as plain paper.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: July 6, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohito Ishida, Tetsuya Atsumi, Isami Itoh, Masatsugu Toyonori
  • Patent number: 7643174
    Abstract: The present invention further improves gradation characteristics from a highlight region to a high-density region. First, the correction processing receives image data, and an image attribute discrimination discriminates whether the data are related to a character/thin line or others on the basis of attribute information on a pixel of interest. If it is discriminated that the data are related to a character/thin line, a pattern matching to data stored in a line buffer is performed to obtain a pixel distance, and in accordance with the pixel distance, a correction amount is determined on the basis of an LUT set in a correction amount determination. Subsequently, on the basis of the determined correction amount, corrected image data are generated and output to the following step.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: January 5, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohito Ishida, Isami Itoh, Tetsuya Atsumi, Masatsugu Toyonori
  • Patent number: 7512349
    Abstract: An image forming apparatus includes an electrophotographic photoconductive body for forming an electrostatic latent image thereon; an exposure device for exposing the electrophotographic photoconductive body to form an electrostatic latent image; a storage device for storing information related to potential characteristics at a plurality of areas divided on a surface of the electrophotographic photoconductive body in advance; an information obtaining device for obtaining the information related to potential characteristics, wherein light quantities exposed by the exposure device are determined according to the information related to potential characteristics stored by the storage device and the information related to potential characteristics obtained by the information obtaining device.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: March 31, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Isami Itoh, Tetsuya Atsumi, Masatsugu Toyonori, Tomohito Ishida
  • Publication number: 20090067869
    Abstract: An image heating apparatus for allowing a surface of a heated toner image borne on a recording material to be glossed without generating a batter in the heated toner image is provided. In an image heating apparatus (9) including heating means (11 and 12) for heating an unfixed toner image (ta) borne on a recording material (P) and pressure means (21 and 22) for pressurizing an unfixed toner image (tb) heated by the heating means to gloss a surface of the unfixed toner image, the pressure means includes: pressure force changing means (54L and 54R) for changing a pressure force when the pressure means pressurizes the unfixed toner image; temperature detecting means (51 and 52) for detecting a temperature of the pressure means; and pressurization control means (53).
    Type: Application
    Filed: November 13, 2008
    Publication date: March 12, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Masatsugu Toyonori, Tomohito Ishida, Tetsuya Atsumi, Isami Itoh
  • Publication number: 20070160376
    Abstract: An image forming apparatus is provided in which on-surface potential unevenness of an image carrier can be suppressed, and with which an output image having excellent on-surface uniformity of color or the like can be obtained. The image forming apparatus includes: a photoconductive image carrier; charger which charges the image carrier; image exposing unit which exposes an image on a surface of the image carrier after the charging to form a latent electrostatic image; developing unit which develops the latent electrostatic image by adhering toner to the latent electrostatic image to form a toner image; and transfer charger which transfers the obtained toner image to a final supporting member such as plain paper.
    Type: Application
    Filed: January 5, 2007
    Publication date: July 12, 2007
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Tomohito ISHIDA, Tetsuya Atsumi, Isami Itoh, Masatsugu Toyonori
  • Publication number: 20070024881
    Abstract: The present invention further improves gradation characteristics from a highlight region to a high-density region. First, the correction processing receives image data, and an image attribute discrimination discriminates whether the data are related to a character/thin line or others on the basis of attribute information on a pixel of interest. If it is discriminated that the data are related to a character/thin line, a pattern matching to data stored in a line buffer is performed to obtain a pixel distance, and in accordance with the pixel distance, a correction amount is determined on the basis of an LUT set in a correction amount determination. Subsequently, on the basis of the determined correction amount, corrected image data are generated and output to the following step.
    Type: Application
    Filed: July 24, 2006
    Publication date: February 1, 2007
    Applicant: Canon Kabushiki Kaisha
    Inventors: Tomohito Ishida, Isami Itoh, Tetsuya Atsumi, Masatsugu Toyonori
  • Publication number: 20070025747
    Abstract: Good images are formed without density irregularity even if an image supporting body varies with time. Potentials at developing locations after exposing the surface of an a-Si photoconductive body, which are recorded in a potential attenuation characteristic map, are compared with seven ranges A-G obtained by dividing the surface of the a-Si photoconductive body at every 6-volt interval to detect deviations of the potentials from a prescribed potential Vl (step S2). Individual blocks all over the surface of the a-Si photoconductive body are classified to A-G, and the exposure values are set in accordance with A-G so that Vl of the individual blocks on the surface of the a-Si photoconductive body belongs to D range (step S3). An input image undergoes image processing after its entire plane being divided into blocks corresponding to the surface of the photoconductive body (steps S4 and S5).
    Type: Application
    Filed: July 24, 2006
    Publication date: February 1, 2007
    Applicant: Canon Kabushiki Kaisha
    Inventors: Isami Itoh, Tetsuya Atsumi, Masatsugu Toyonori, Tomohito Ishida