Patents by Inventor Shinichi Agata

Shinichi Agata 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: 10656547
    Abstract: Provided is an image forming apparatus, including an apparatus main body, an image bearing member unit having at least an image bearing member and a charging member, and a developing unit having at least a developer bearing member. The apparatus main body has a controller, the image bearing member unit further has a first storage unit that stores first correction information corresponding to life information of the developing unit, the developing unit further has a second storage unit that stores second correction information corresponding to life information of the developing unit, and the controller acquires the first correction information and the second correction information, uses the acquired first correction information and the acquired second correction information to correct a charging bias to be applied to the charging member, and applies the corrected charging bias to the charging member.
    Type: Grant
    Filed: January 22, 2019
    Date of Patent: May 19, 2020
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shuhei Kawasaki, Kodai Hayashi, Shinichi Agata, Keisuke Endoh
  • Publication number: 20200150553
    Abstract: A charging member 2 that charges an image bearing member 1 has an electrically conductive support and an elastic layer in contact with the image bearing member 1. The elastic layer includes a semi-conductive rubber composition having a matrix-domain structure including a matrix and domains having electric conductivity. The matrix has a higher volume resistivity than the domain. The developer includes a toner having toner particles. The toner particles each have a surface layer including an organosilicon polymer. The organosilicon polymer has a structure represented by R—SiO3/2 (R is a hydrocarbon group having at least 1 and not more than 6 carbon atoms). The adhesion ratio of the organosilicon polymer on the surface of the toner particle is 90% or more.
    Type: Application
    Filed: November 11, 2019
    Publication date: May 14, 2020
    Inventors: Shinichi Agata, Shinichi Hagiwara, Yoshihiro Mitsui, Kosuke Ikada, Kentaro Yamawaki
  • Publication number: 20200150558
    Abstract: A developing device includes a developer carrying member, a developing frame, and a regulating member. The regulating member includes a curved surface portion contactable to a surface of the developer carrying member, and satisfies the following relationships: 200 MPa?HM?1100 MPa, and 0.08 mm?Rb?0.3 mm, where HM is a Martens hardness of toner contained in the developer under a maximum load of 2.0×10?4 N, and Rb is a radius of curvature of the curved surface portion.
    Type: Application
    Filed: November 13, 2019
    Publication date: May 14, 2020
    Inventors: Takuya Oka, Yoshihiro Mitsui, Akinobu Saito, Shinichi Agata, Kentaro Yamawaki
  • Patent number: 10642203
    Abstract: An image forming apparatus includes a control unit that controls an electric potential difference between a development roller and a supply roller in such a manner that force in a direction from the supply roller toward the development roller acts on toner in a section of an image forming region extending from a leading edge of a first image forming region toward a trailing edge thereof. The control unit controls the electric potential difference in such a manner that force acting on the toner becomes smaller in a section extending from a switching point, which is located at a position obtained by returning from a leading edge of a second image forming region to the first image forming region by a distance equal to or greater than a circumferential length of the development roller, to the trailing edge of the first image forming region.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: May 5, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takayoshi Kihara, Shinichi Agata
  • Patent number: 10534288
    Abstract: A developing device includes developer, a developer bearing member, and a supply member that is in contact with the developer bearing member and supplies the developer. The developing device further includes a developing chamber in which the developer bearing member and the supply member are disposed, a developer containing chamber that contains the developer, a partition wall that partitions the developing chamber and the developer containing chamber from each other and is provided with an opening that communicates the developing chamber and the developer containing chamber with each other, and a conveyance member that conveys the developer from the developer containing chamber to the developing chamber. The conveyance member is provided with a hole through which the developer can pass or has a protrusion that generates a gap between the conveyance member and the partition wall.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: January 14, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kodai Hayashi, Shinichi Agata
  • Publication number: 20190227454
    Abstract: Provided is an image forming apparatus, including an apparatus main body, an image bearing member unit having at least an image bearing member and a charging member, and a developing unit having at least a developer bearing member. The apparatus main body has a controller, the image bearing member unit further has a first storage unit that stores first correction information corresponding to life information of the developing unit, the developing unit further has a second storage unit that stores second correction information corresponding to life information of the developing unit, and the controller acquires the first correction information and the second correction information, uses the acquired first correction information and the acquired second correction information to correct a charging bias to be applied to the charging member, and applies the corrected charging bias to the charging member.
    Type: Application
    Filed: January 22, 2019
    Publication date: July 25, 2019
    Inventors: Shuhei Kawasaki, Kodai Hayashi, Shinichi Agata, Keisuke Endoh
  • Publication number: 20190094754
    Abstract: A developing device includes developer, a developer bearing member, and a supply member that is in contact with the developer bearing member and supplies the developer. The developing device further includes a developing chamber in which the developer bearing member and the supply member are disposed, a developer containing chamber that contains the developer, a partition wall that partitions the developing chamber and the developer containing chamber from each other and is provided with an opening that communicates the developing chamber and the developer containing chamber with each other, and a conveyance member that conveys the developer from the developer containing chamber to the developing chamber. The conveyance member is provided with a hole through which the developer can pass or has a protrusion that generates a gap between the conveyance member and the partition wall.
    Type: Application
    Filed: August 30, 2018
    Publication date: March 28, 2019
    Inventors: Kodai Hayashi, Shinichi Agata
  • Publication number: 20180292773
    Abstract: An image forming apparatus includes a control unit that controls an electric potential difference between a development roller and a supply roller in such a manner that force in a direction from the supply roller toward the development roller acts on toner in a section of an image forming region extending from a leading edge of a first image forming region toward a trailing edge thereof. The control unit controls the electric potential difference in such a manner that force acting on the toner becomes smaller in a section extending from a switching point, which is located at a position obtained by returning from a leading edge of a second image forming region to the first image forming region by a distance equal to or greater than a circumferential length of the development roller, to the trailing edge of the first image forming region.
    Type: Application
    Filed: March 30, 2018
    Publication date: October 11, 2018
    Inventors: Takayoshi Kihara, Shinichi Agata
  • Patent number: 10031439
    Abstract: A developing blade has a protrusion that protrudes toward a developing roller in an opposing portion facing the developing roller. The potential difference between a supply bias and a developing bias is denoted by ?(V), a contact pressure of the developing blade with respect to the developing roller is denoted by X (gf/cm), a height of the protrusion from the opposing surface that faces the developing roller at a position further toward a tip side than the protrusion is denoted by H (mm), and a length of the opposing surface in the rotation direction of the developing roller is denoted by L (mm). When viewing a cross-section perpendicular to the rotation axis of the developing roller, 0.05?H?0.1, 0.15?L?1.0, and 15?X?60 are established, and at least ???5*X?125 is satisfied.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: July 24, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shinichi Agata, Takayoshi Kihara
  • Patent number: 9798266
    Abstract: An image forming apparatus includes: a first exposing unit exposing a surface of a charged photosensitive member to form a latent image; a second exposing unit exposing the surface of the photosensitive member after the surface of the photosensitive member passes a transfer position at which a toner image obtained by causing toner to adhere to the latent image is transferred to a transferred body and before the surface of the photosensitive member reaches a charging position; and a control unit varying a length of a period from a timing at which a portion of the photosensitive member exposed by the second exposing unit is initially charged by the charging member to a timing at which the first exposing unit starts formation of the latent image when performing image formation based on a print signal, based on information related to a photosensitive layer thickness of the photosensitive member.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: October 24, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Shinichi Agata, Kosuke Ikada
  • Publication number: 20170285514
    Abstract: A developing blade has a protrusion that protrudes toward a developing roller in an opposing portion facing the developing roller. When a height of the protrusion from an opposing surface that faces the developing roller at a position further toward a tip side than the protrusion is denoted by H (mm) and a length of the opposing surface extending toward the tip side perpendicular to an axial line direction of the developing roller is denoted by L (mm), when viewing a cross section perpendicular to a rotation axis of the developing roller, the following conditions are satisfied: 0.05?H?0.3, and 0.15?L?1.0.
    Type: Application
    Filed: March 23, 2017
    Publication date: October 5, 2017
    Inventors: Takayoshi Kihara, Shinichi Agata
  • Publication number: 20170285515
    Abstract: A developing blade has a protrusion that protrudes toward a developing roller in an opposing portion facing the developing roller. When the potential difference between a supply bias and a developing bias is denoted by ?(V), a contact pressure of the developing blade with respect to the developing roller is denoted by X (gf/cm), and a height of the protrusion from the opposing surface that faces the developing roller at a position further toward a tip side than the protrusion is denoted by H (mm) and a length of the opposing surface in the rotation direction of the developing roller is denoted by L (mm), when viewing a cross section perpendicular to the rotation axis of the developing roller, 0.05?H?0.1, 0.15?L?1.0, and 15?X?60 are established, and at least ???5*X?125 is satisfied.
    Type: Application
    Filed: March 24, 2017
    Publication date: October 5, 2017
    Inventors: Shinichi Agata, Takayoshi Kihara
  • Patent number: 9753395
    Abstract: An image forming apparatus includes an acquiring portion that acquires a duration of an overcharged state occurring in an area of an image bearing body charged by a charging member after the image bearing body is exposed by a preliminary exposing portion. Adjustment is made to an interval between a first timing when the preliminary exposing portion starts exposing the image bearing body before execution of an adjustment operation for setting a transfer voltage value and a second timing when a voltage applying portion starts, during the subsequent adjustment operation, applying a voltage with an adjustment voltage value to a transfer member such that the second timing is later than a third timing when the duration acquired by the acquiring portion ends.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: September 5, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kosuke Ikada, Shinichi Agata
  • Publication number: 20170031258
    Abstract: An image forming apparatus includes: a first exposing unit exposing a surface of a charged photosensitive member to form a latent image; a second exposing unit exposing the surface of the photosensitive member after the surface of the photosensitive member passes a transfer position at which a toner image obtained by causing toner to adhere to the latent image is transferred to a transferred body and before the surface of the photosensitive member reaches a charging position; and a control unit varying a length of a period from a timing at which a portion of the photosensitive member exposed by the second exposing unit is initially charged by the charging member to a timing at which the first exposing unit starts formation of the latent image when performing image formation based on a print signal, based on information related to a photosensitive layer thickness of the photosensitive member.
    Type: Application
    Filed: July 28, 2016
    Publication date: February 2, 2017
    Inventors: Shinichi Agata, Kosuke Ikada
  • Publication number: 20170031260
    Abstract: An image forming apparatus includes an acquiring portion that acquires a duration of an overcharged state occurring in an area of an image bearing body charged by a charging member after the image bearing body is exposed by a preliminary exposing portion. Adjustment is made to an interval between a first timing when the preliminary exposing portion starts exposing the image bearing body before execution of an adjustment operation for setting a transfer voltage value and a second timing when a voltage applying portion starts, during the subsequent adjustment operation, applying a voltage with an adjustment voltage value to a transfer member such that the second timing is later than a third timing when the duration acquired by the acquiring portion ends.
    Type: Application
    Filed: July 28, 2016
    Publication date: February 2, 2017
    Inventors: Kosuke Ikada, Shinichi Agata
  • Patent number: 8811833
    Abstract: An image forming apparatus includes a developing device, a detection mode execution unit, and a notice signal generating unit. The developing device supplies a toner bearing member with toner in a container by rotating a toner supply member in a contact manner with the toner bearing member. The detection mode execution unit executes a detection mode in which a predetermined period for changing a toner amount in the foam layer by rotating the toner supply member is provided, a capacitance C1 between the first and second electrode members is detected before the predetermined period, and a capacitance C2 between the first and second electrode members is detected after the predetermined period. The notice signal generating unit generates a low toner amount notice signal in response to an absolute value |C1?C2| of a difference between the capacitances C1 and C2 being smaller than a predetermined threshold.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: August 19, 2014
    Assignee: Canon Kabushiki Kaisha
    Inventors: Motoki Adachi, Masanori Tanaka, Hideo Kihara, Takashi Mukai, Shinichi Agata, Shuhei Kawasaki, Yuji Kawaguchi
  • Publication number: 20120195611
    Abstract: An image forming apparatus includes a developing device, a detection mode execution unit, and a notice signal generating unit. The developing device supplies a toner bearing member with toner in a container by rotating a toner supply member in a contact manner with the toner bearing member. The detection mode execution unit executes a detection mode in which a predetermined period for changing a toner amount in the foam layer by rotating the toner supply member is provided, a capacitance C1 between the first and second electrode members is detected before the predetermined period, and a capacitance C2 between the first and second electrode members is detected after the predetermined period. The notice signal generating unit generates a low toner amount notice signal in response to an absolute value |C1?C2| of a difference between the capacitances C1 and C2 being smaller than a predetermined threshold.
    Type: Application
    Filed: October 18, 2010
    Publication date: August 2, 2012
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Motoki Adachi, Masanori Tanaka, Hideo Kihara, Takashi Mukai, Shinichi Agata, Shuhei Kawasaki, Yuji Kawaguchi
  • Publication number: 20110158707
    Abstract: A restricting blade includes: a metallic plate subjected to punching; a contact surface perpendicular to a thickness direction of the metallic plate, the surface being positioned upstream in a punch direction; an end surface of the metallic plate, formed by the punching, the surface being positioned at the metallic plate upstream in a rotational direction of the developing roller; and a coating layer formed in such a manner as to cover a part of a surface positioned opposite to the contact surface in the thickness direction of the metallic plate and the end surface with a resin or an elastomer.
    Type: Application
    Filed: November 19, 2010
    Publication date: June 30, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventor: Shinichi Agata
  • Patent number: 7711279
    Abstract: An image forming apparatus includes a rotatable image bearing member on which an electrostatic latent image is formed; a charging member for being supplied with a charging voltage which is a DC voltage not having an AC voltage component and for contacting the bearing member to electrically charge a surface of the bearing member using an electric discharge; a transfer member for transferring onto a transfer material a toner image formed on the surface of the bearing member by developing the electrostatic latent image, at a transfer position; wherein the charging potential of the charging member is different between when the charging member provides a first region with a potential and when the charging member provides a second region with a potential, thus providing a predetermined potential difference between the first region and the second region, and wherein the transfer member is not supplied with a voltage when the second region is at the transfer position, where the first region is a region on the image b
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: May 4, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kohei Matsuda, Tetsuya Kobayashi, Shinya Yamamoto, Masato Koyanagi, Kentaro Kawata, Shinichi Agata
  • Publication number: 20100054776
    Abstract: An image forming apparatus includes an image bearing member and a charging roller rotatable in contact therewith. Before driving of the image bearing member starts, a bias having the same polarity as that of an image forming bias is applied between the charging roller and the image bearing member. The time of application of the bias varies with the accumulated time of rotation of the image bearing member or the time of making the driving of the image bearing member inactive.
    Type: Application
    Filed: August 27, 2009
    Publication date: March 4, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yoshihiro Mitsui, Shinichi Agata