Patents by Inventor Tatsuya KOHNO

Tatsuya KOHNO 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: 11960221
    Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.
    Type: Grant
    Filed: October 6, 2022
    Date of Patent: April 16, 2024
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryosuke Tsuruga, Yutaka Kakehi, Tatsuya Kohno, Manato Kobayashi
  • Patent number: 11815836
    Abstract: An image forming apparatus includes an image bearing member, an image forming portion, transfer member, a power source, a current detecting portion, an acquiring portion, and a controller capable of executing an operation in an adjustment mode. In the operation in the adjustment mode, the controller selects test toner images for setting a transfer voltage for a second side of a recording material, on the basis of information on densities of the test toner images acquired by the acquiring portion, and then adjusts the transfer voltage for the second side of the recording material on the basis of a current detected by the current detecting portion when the selected test toner images are transferred onto the recording material.
    Type: Grant
    Filed: March 22, 2022
    Date of Patent: November 14, 2023
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yusuke Minato, Takenori Sueoka, Tatsuya Kohno
  • Publication number: 20230305428
    Abstract: An image forming apparatus includes an image bearing member and a developer bearing member. A first period is from when rotational drive of the developer bearing member is started until increased to a speed at which the image forming apparatus performs image forming. A first absolute value of a difference between a developer bearing member surface potential Vdc and an image bearing member surface potential Vd, as determined when the image bearing member is facing the developer bearing member, is obtained during the first period. The value |Vdc?Vd| obtained during the first period is smaller than the value |Vdc?Vd| obtained after the first period. During the first period, the image bearing member surface potential Vd at the facing position is a first potential and, after the first period, the image bearing member surface potential Vd at the facing position becomes a second potential different from the first potential.
    Type: Application
    Filed: March 13, 2023
    Publication date: September 28, 2023
    Inventors: TATSUYA KOHNO, TAKAHITO FUSE, ATSUSHI MATSUMOTO, HIROAKI ISHIDA
  • Publication number: 20230107683
    Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.
    Type: Application
    Filed: October 6, 2022
    Publication date: April 6, 2023
    Inventors: Ryosuke Tsuruga, Yutaka Kakehi, Tatsuya Kohno, Manato Kobayashi
  • Patent number: 11500309
    Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.
    Type: Grant
    Filed: June 15, 2021
    Date of Patent: November 15, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryosuke Tsuruga, Yutaka Kakehi, Tatsuya Kohno, Manato Kobayashi
  • Publication number: 20220317608
    Abstract: An image forming apparatus includes an image bearing member, an image forming portion, transfer member, a power source, a current detecting portion, an acquiring portion, and a controller capable of executing an operation in an adjustment mode. In the operation in the adjustment mode, the controller selects test toner images for setting a transfer voltage for a second side of a recording material, on the basis of information on densities of the test toner images acquired by the acquiring portion, and then adjusts the transfer voltage for the second side of the recording material on the basis of a current detected by the current detecting portion when the selected test toner images are transferred onto the recording material.
    Type: Application
    Filed: March 22, 2022
    Publication date: October 6, 2022
    Inventors: Yusuke Minato, Takenori Sueoka, Tatsuya Kohno
  • Patent number: 11347165
    Abstract: An image forming apparatus includes an image forming portion, a belt, an inner roller, an outer member, an inner roller position changing mechanism, an acquiring portion, and a controller. In a case that information acquired by the acquiring portion shows that first and second recording materials are coated paper, the controller controls a position changing mechanism so that a position of the inner roller when a toner image is transferred onto the second recording material is changed to a second position. In a case that the information acquired by the acquiring portion shows that the first and second recording materials are plain paper, the controller controls the position changing mechanism so that the position of the inner roller when the toner image is transferred onto the second recording material is maintained at a first position.
    Type: Grant
    Filed: June 17, 2021
    Date of Patent: May 31, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yutaka Kakehi, Ryosuke Tsuruga, Tatsuya Kohno, Manato Kobayashi
  • Publication number: 20210397113
    Abstract: An image forming apparatus includes an image forming portion, a belt, an inner roller, an outer member, an inner roller position changing mechanism, an acquiring portion, and a controller. In a case that second information acquired by the acquiring portion shows that first and second recording materials are coated paper, the controller controls a position changing mechanism so that a position of the inner roller when a toner image is transferred onto the second recording material is changed to a second position. In a case that the second information acquired by the acquiring portion shows that the first and second recording materials are plain paper, the controller controls the position changing mechanism so that the position of the inner roller when the toner image is transferred onto the second recording material is maintained at a first position.
    Type: Application
    Filed: June 17, 2021
    Publication date: December 23, 2021
    Inventors: Yutaka Kakehi, Ryosuke Tsuruga, Tatsuya Kohno, Manato Kobayashi
  • Publication number: 20210397112
    Abstract: An image forming apparatus includes an image forming portion, a belt, a plurality of stretching rollers including an inner roller and an upstream roller, an outer member, an urging member, a first position changing mechanism, a storing portion, a controller, and an operating portion. The controller controls the first position changing mechanism on the basis of a kind of a recording material on which an image is formed, first set information stored in the storing portion, and first input information for changing setting of a position of the urging member inputted to the controller through the operating portion.
    Type: Application
    Filed: June 15, 2021
    Publication date: December 23, 2021
    Inventors: Ryosuke Tsuruga, Yutaka Kakehi, Tatsuya Kohno, Manato Kobayashi
  • Patent number: 11137709
    Abstract: An image forming apparatus includes an image bearing member, a transfer member, a voltage source, a current detecting portion, and a controller. In a case that the predetermined voltage is changed in a first job on the basis of the detection result of the current detecting portion during passing of the recording material through the transfer portion, in a second job subsequent to the first job, when a first recording material of the second job passes through the transfer portion, the controller changes a voltage applied to the transfer member on the basis of the predetermined voltage changed in the first job.
    Type: Grant
    Filed: June 26, 2020
    Date of Patent: October 5, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tatsuya Kohno, Takenori Sueoka, Yusuke Minato, Mitsuru Yamatani
  • Patent number: 11029626
    Abstract: An image forming apparatus includes a belt, an outer roller, stretching rollers including an inner roller and an upstream roller, a voltage source, a supporting member, a moving mechanism, a sensor, and a controller. On the basis of a first detection result of the sensor acquired under application of a test bias in a state in which the supporting member is disposed at a first position, the controller determines a first transfer bias to be applied to the outer roller or the inner roller during an operation in a first mode. On the basis of a second detection result of the sensor acquired under application of the test bias in the state in which the supporting member is disposed at a second position, the controller determines a second transfer bias to be applied to the outer roller or the inner roller during an operation in a second mode.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: June 8, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yuusuke Torimaru, Dai Kanai, Shozo Aiba, Tatsuya Kohno
  • Publication number: 20200409299
    Abstract: An image forming apparatus includes an image bearing member, a transfer member, a voltage source, a current detecting portion, and a controller. In a case that the predetermined voltage is changed in a first job on the basis of the detection result of the current detecting portion during passing of the recording material through the transfer portion, in a second job subsequent to the first job, when a first recording material of the second job passes through the transfer portion, the controller changes a voltage applied to the transfer member on the basis of the predetermined voltage changed in the first job.
    Type: Application
    Filed: June 26, 2020
    Publication date: December 31, 2020
    Inventors: Tatsuya Kohno, Takenori Sueoka, Yusuke Minato, Mitsuru Yamatani
  • Patent number: 10551762
    Abstract: An image forming apparatus includes an endless belt, an inner roller, an upstream roller, a pressing member, and a guiding member. In a cross-section perpendicular to a rotational axis of the inner roller, a downstream free end of the guiding member is disposed downstream of a pressing portion normal line Lc with respect to a feeding direction of the sheet, where L is a reference line which is a common tangent of the inner roller and the upstream roller in a contact portion relative to the belt, Ld is a pressing portion tangent line, parallel with the reference line, of the belt in a region where the pressing member contacts the belt, and Lc is the pressing portion normal line passing through a contact point between the belt and the pressing portion tangent line Ld and perpendicular to the reference line L.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: February 4, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Tatsuya Kohno
  • Publication number: 20190354044
    Abstract: An image forming apparatus includes a belt, an outer roller, stretching rollers including an inner roller and an upstream roller, a voltage source, a supporting member, a moving mechanism, a sensor, and a controller. On the basis of a first detection result of the sensor acquired under application of a test bias in a state in which the supporting member is disposed at a first position, the controller determines a first transfer bias applied to the outer roller or the inner roller during an operation in a first mode. On the basis of a second detection result of the sensor acquired under application of the test bias in the state in which the supporting member is disposed at a second position, the controller determines a second transfer bias applied to the outer roller or the inner roller during an operation in a second mode.
    Type: Application
    Filed: May 14, 2019
    Publication date: November 21, 2019
    Inventors: Yuusuke Torimaru, Dai Kanai, Shozo Aiba, Tatsuya Kohno
  • Publication number: 20190129323
    Abstract: An image forming apparatus includes an endless belt, an inner roller, an upstream roller and a pressing member, and a guiding member. In a cross-section perpendicular to a rotational axis of the inner roller, a downstream free end of the guiding member is disposed downstream of a pressing portion normal line Lc with respect to the feeding direction of the sheet, where L is a reference line which is a common tangent of the inner roller and the upstream roller in a contact portion relative to the belt, Ld is a pressing portion tangent line, parallel with the reference line, of the belt in a region where the pressing member contacts the belt, and Lc is the pressing portion normal line passing through a contact point between the belt and the pressing portion tangent line Ld and perpendicular to the reference line L.
    Type: Application
    Filed: October 31, 2018
    Publication date: May 2, 2019
    Inventor: Tatsuya Kohno
  • Publication number: 20170266722
    Abstract: A method for manufacturing a light alloy wheel that includes a substantially annular rim part and a disc part that is joined to one edge of the rim part on an inner side and is to be attached to an axle. The method includes a molten metal pouring step for pouring a light alloy molten metal from a sprue opened into a mold cavity formed into a shape of the rim part, and a forced cooling step for, after the molten metal pouring step, forcibly cooling the light alloy molten metal poured into the mold cavity formed into the shape of the rim part such that one predetermined cooling unit of a plurality of cooling units provided along an entire circumference on an outer side or an inner side of the mold cavity formed into the shape of the rim part is first operated and an other cooling unit thereof is then operated.
    Type: Application
    Filed: September 14, 2015
    Publication date: September 21, 2017
    Applicant: Hitachi Metals, Ltd.
    Inventors: Takeshi HARIMOTO, Tatsuya KOHNO, Shigekazu YAMADA