Patents by Inventor Tomoo Akizuki

Tomoo Akizuki 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: 11960226
    Abstract: An image forming apparatus includes a photosensitive member, a developing member to supply a toner to the photosensitive member at a developing portion, and a transfer member to transfer a toner image to a recording material passing through a transfer portion from the photosensitive member. In a case which the transfer is performed to a shorter width recording material and thereafter, the transfer is successively performed to a longer width recording material, a control portion controls a first back contrast formed when an area of a surface of the photosensitive member corresponding to the transfer portion through which the shorter width recording material is passing reaches the developing portion, and a second back contrast formed when an area of the surface corresponding to the transfer portion through which the longer width recording material is passing reaches the developing portion so that the second back contrast is higher than the first back contrast.
    Type: Grant
    Filed: November 17, 2022
    Date of Patent: April 16, 2024
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroki Sasame, Tomoo Akizuki
  • Publication number: 20230288857
    Abstract: An image forming apparatus includes a photosensitive member, a charging member, an exposing unit to expose a surface of the photosensitive member, and a developing member to supply toner with normal polarity at a developing portion. A controller, during a non-image formation when a toner image is not formed on a surface of the photosensitive member, controls such that a developing voltage is changed in a predetermined voltage width by applying a first developing voltage while the area of the photosensitive member on which a first surface potential is formed passes through the developing portion and by applying a second developing potential of an opposite polarity side rather than the first developing voltage while the area of the photosensitive member on which a second surface potential is formed passes through the developing portion, and the controller controls such that the surface potential becomes a side of the normal polarity rather than the first developing voltage.
    Type: Application
    Filed: January 24, 2023
    Publication date: September 14, 2023
    Inventors: Tomoo Akizuki, Yusuke Shimizu
  • Publication number: 20230236524
    Abstract: An image forming apparatus includes a developer bearing member, a supply member, first and second voltage application units, and a control unit. Assuming that a difference between a voltage to be applied to the developer bearing member by the first voltage application unit and a voltage to be applied to the supply member by the second voltage application unit in the image forming operation is defined as a first supply contrast, and a difference between the voltage to be applied to the developer bearing member by the first voltage application unit and the voltage to be applied to the supply member by the second voltage application unit in the preliminary rotation operation is defined as a second supply contrast, the control unit controls the second supply contrast to be less than the first supply contrast or to have polarity reversed from polarity of the first supply contrast.
    Type: Application
    Filed: March 30, 2023
    Publication date: July 27, 2023
    Inventors: Yusuke Shimizu, Tomoo Akizuki, Naoki Fukushima
  • Publication number: 20230152740
    Abstract: An image forming apparatus includes a photosensitive member, a developing member to supply a toner to the photosensitive member at a developing portion, a transfer member to transfer a toner image to a recording material passing through a transfer portion from the photosensitive member. In a case which the transfer is performed to a smaller width recording material and thereafter, the transfer is successively performed to a larger width recording material, a control portion controls a first back contrast formed when an area of a surface of the photosensitive member corresponding to the transfer portion through which the smaller width recording material is passing reaches the developing portion, and a second back contrast formed when an area of the surface corresponding to the transfer portion through which the larger width recording material is passing reaches the developing portion so that the second back contrast is larger than the first back contrast.
    Type: Application
    Filed: November 17, 2022
    Publication date: May 18, 2023
    Inventors: Hiroki Sasame, Tomoo Akizuki
  • Patent number: 11640123
    Abstract: An image forming apparatus includes a developer bearing member, a supply member, first and second voltage application units, and a control unit. Assuming that a difference between a voltage to be applied to the developer bearing member by the first voltage application unit and a voltage to be applied to the supply member by the second voltage application unit in the image forming operation is defined as a first supply contrast, and a difference between the voltage to be applied to the developer bearing member by the first voltage application unit and the voltage to be applied to the supply member by the second voltage application unit in the preliminary rotation operation is defined as a second supply contrast, the control unit controls the second supply contrast to be less than the first supply contrast or to have polarity reversed from polarity of the first supply contrast.
    Type: Grant
    Filed: April 18, 2022
    Date of Patent: May 2, 2023
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yusuke Shimizu, Tomoo Akizuki, Naoki Fukushima
  • Publication number: 20230116189
    Abstract: A heater includes: a substrate; an insulating layer that is provided on the substrate; and a heat generating element that is provided on the insulating layer, and in a case where a region including a center of the substrate is defined as a first region, a region on a side closer to one end portion than the first region is defined as a second region, and a region on a side closer to the other end portion than the first region is defined as a third region in a transverse direction that is orthogonal to a longitudinal direction of a surface of the substrate on which the insulating layer is provided, the first region is a plane, and the second region and the third region are bent from the first region in a thickness direction of the substrate that is orthogonal to the longitudinal direction and the transverse direction.
    Type: Application
    Filed: October 5, 2022
    Publication date: April 13, 2023
    Inventors: Tatsuya Kinukawa, Yutaka Sato, Sho Taguchi, Tomoo Akizuki, Yuki Oshima, Osamu Sasaoka, Masafumi Maeda
  • Publication number: 20220342339
    Abstract: An image forming apparatus includes a developer bearing member, a supply member, first and second voltage application units, and a control unit. Assuming that a difference between a voltage to be applied to the developer bearing member by the first voltage application unit and a voltage to be applied to the supply member by the second voltage application unit in the image forming operation is defined as a first supply contrast, and a difference between the voltage to be applied to the developer bearing member by the first voltage application unit and the voltage to be applied to the supply member by the second voltage application unit in the preliminary rotation operation is defined as a second supply contrast, the control unit controls the second supply contrast to be less than the first supply contrast or to have polarity reversed from polarity of the first supply contrast.
    Type: Application
    Filed: April 18, 2022
    Publication date: October 27, 2022
    Inventors: Yusuke Shimizu, Tomoo Akizuki, Naoki Fukushima
  • Patent number: 11402778
    Abstract: An image forming apparatus includes an image forming unit, a fixing unit, an image analyzer, and a temperature controller configured to control a temperature of the fixing unit in accordance to a target temperature. The image analyzer is configured to analyze image data for forming the toner image by the image forming unit, to evaluate a continuity of pixels of an image contained in the image data. The temperature controller is configured to change the target temperature based on analysis results of the image analyzer such that a value of the target temperature in a case where the image data contains an image with a continuity of pixels equal to or smaller than a predetermined value is higher than a value of the target temperature in a case where the image data contains no image with a continuity of pixels equal to or smaller than the predetermined value.
    Type: Grant
    Filed: December 17, 2020
    Date of Patent: August 2, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Satoshi Nishida, Ryo Morihara, Tomoo Akizuki
  • Patent number: 11360417
    Abstract: A heater includes a substrate formed of metal into a plate shape in which a length in a longitudinal direction thereof is greater than a length in a short direction thereof when viewed in a thickness direction thereof, an insulating layer formed of insulating material on a first surface of the substrate on a first side in the thickness direction, a heating element arranged on the insulating layer and configured to generate heat by flowing electric current therethrough, and a cover layer arranged to cover the heating element. The heater is a warped shape when receiving no external force, such that a center portion of the heater in the longitudinal direction protrudes to the first side in the thickness direction compared to both end portions of the heater in the longitudinal direction.
    Type: Grant
    Filed: February 11, 2021
    Date of Patent: June 14, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shoichiro Ikegami, Tomoo Akizuki, Hiroki Sasame, Yusuke Shimizu, Tatsuya Kinukawa
  • Patent number: 11275324
    Abstract: In an image forming apparatus, in a case in which a second toner image to be transferred to a same recording material as a first toner image is to be transferred is formed on the photosensitive member after the first toner image is formed on the photosensitive member and the first toner image is formed on an area of the photosensitive member including at least a part of a position of the second toner image one cycle before with respect to a movement direction of the surface of the photosensitive member, a control unit changes a value of a transfer current at a time of transferring the first toner image to a transfer-receiving member between a first value and a second value of which an absolute value is greater than an absolute value of the first value, based on image information regarding the second toner image.
    Type: Grant
    Filed: September 3, 2020
    Date of Patent: March 15, 2022
    Assignee: Canon Kabushiki Kaisha
    Inventors: Hiroki Sasame, Tomoo Akizuki, Yusuke Shimizu
  • Patent number: 11112737
    Abstract: A fixing apparatus includes a tubular film, an elongate plate-like heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater being in contact with the inner surface of the film with the second surface, a heat conducting member that is long along the length of the heater and is in contact with the second surface of the heater, and a support member capable of rotating the film while supporting the heater, with the heat conducting member therebetween. The heat conducting member includes an extending portion extending, outside an upstream end of the heater in a rotational direction of the film, in a direction from the second surface of the heater toward the first surface. The extending portion includes a contact portion protruding from the first surface of the heater toward the film into contact therewith.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: September 7, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada, Akihito Kanamori, Yusuke Nakazono, Shinji Kubo
  • Publication number: 20210263454
    Abstract: A heater includes a substrate formed of metal into a plate shape in which a length in a longitudinal direction thereof is greater than a length in a short direction thereof when viewed in a thickness direction thereof, an insulating layer formed of insulating material on a first surface of the substrate on a first side in the thickness direction, a heating element arranged on the insulating layer and configured to generate heat by flowing electric current therethrough, and a cover layer arranged to cover the heating element. The heater is a warped shape when receiving no external force, such that a center portion of the heater in the longitudinal direction protrudes to the first side in the thickness direction compared to both end portions of the heater in the longitudinal direction.
    Type: Application
    Filed: February 11, 2021
    Publication date: August 26, 2021
    Inventors: Shoichiro Ikegami, Tomoo Akizuki, Hiroki Sasame, Yusuke Shimizu, Tatsuya Kinukawa
  • Publication number: 20210191294
    Abstract: An image forming apparatus includes an image forming unit, a fixing unit, an image analyzer, and a temperature controller configured to control a temperature of the fixing unit in accordance to a target temperature. The image analyzer is configured to analyze image data for forming the toner image by the image forming unit, to evaluate a continuity of pixels of an image contained in the image data. The temperature controller is configured to change the target temperature based on analysis results of the image analyzer such that a value of the target temperature in a case where the image data contains an image with a continuity of pixels equal to or smaller than a predetermined value is higher than a value of the target temperature in a case where the image data contains no image with a continuity of pixels equal to or smaller than the predetermined value.
    Type: Application
    Filed: December 17, 2020
    Publication date: June 24, 2021
    Inventors: Satoshi Nishida, Ryo Morihara, Tomoo Akizuki
  • Patent number: 10990029
    Abstract: An image forming apparatus includes a photosensitive member; a scan unit configured to scan the photosensitive member with light based on image data, and form a latent image on the photosensitive member; a developing unit configured to form an image on the photosensitive member by attaching toner to the latent image formed on the photosensitive member; and a correction unit configured to correct an exposure amount of the photosensitive member such that a density change of the image in a main scanning direction due to a configuration of the scan unit and a density of the image to be formed is reduced.
    Type: Grant
    Filed: April 14, 2020
    Date of Patent: April 27, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoo Akizuki, Kenichi Iida, Hikaru Osada, Yusuke Shimizu
  • Publication number: 20210072662
    Abstract: In an image forming apparatus, in a case in which a second toner image to be transferred to a same recording material as a first toner image is to be transferred is formed on the photosensitive member after the first toner image is formed on the photosensitive member and the first toner image is formed on an area of the photosensitive member including at least a part of a position of the second toner image one cycle before with respect to a movement direction of the surface of the photosensitive member, a control unit changes a value of a transfer current at a time of transferring the first toner image to a transfer-receiving member between a first value and a second value of which an absolute value is greater than an absolute value of the first value, based on image information regarding the second toner image.
    Type: Application
    Filed: September 3, 2020
    Publication date: March 11, 2021
    Inventors: Hiroki Sasame, Tomoo Akizuki, Yusuke Shimizu
  • Patent number: 10901351
    Abstract: In a first operation mode in which a first addition value for each sheet of a recording material and a first initial control temperature, when the total sum of the first addition values exceeds a predetermined threshold value, a control portion of an image heating portion, which heats an image on the recording material, of an image forming apparatus changes the first initial control temperature to a first correction control temperature. When the operation mode is changed from the first operation mode to a second operation mode in which a second addition value different from the first addition value and a second initial control temperature different from the first initial control temperature, the control portion corrects the first correction control temperature based on a difference between initial control target temperatures.
    Type: Grant
    Filed: December 16, 2019
    Date of Patent: January 26, 2021
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki
  • Publication number: 20200241439
    Abstract: An image forming apparatus includes a photosensitive member; a scan unit configured to scan the photosensitive member with light based on image data, and form a latent image on the photosensitive member; a developing unit configured to form an image on the photosensitive member by attaching toner to the latent image formed on the photosensitive member; and a correction unit configured to correct an exposure amount of the photosensitive member such that a density change of the image in a main scanning direction due to a configuration of the scan unit and a density of the image to be formed is reduced.
    Type: Application
    Filed: April 14, 2020
    Publication date: July 30, 2020
    Inventors: Tomoo Akizuki, Kenichi Iida, Hikaru Osada, Yusuke Shimizu
  • Patent number: 10725405
    Abstract: A fixing device including a rotatable tubular film, a heater including a substrate and a heat generating resistor, the heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater extending in a longitudinal direction of the substrate, and a heat conducting member extending in the longitudinal direction and including a heater contact portion in contact with the second surface. The heat conducting member includes a film contact portion at a position adjacent to the first surface, the film contact portion being in contact with the inner circumferential surface, and on one side in the longitudinal direction, the heat generating resistor extends outside of a longitudinal end portion of the film contact portion, and the heater contact portion extends outside of the film contact portion.
    Type: Grant
    Filed: October 10, 2018
    Date of Patent: July 28, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomoo Akizuki, Masahiko Suzumi, Tatsuya Kinukawa, Takeharu Nakada, Ryo Morihara
  • Patent number: 10725407
    Abstract: A fixing apparatus includes a holding member including a groove-like holding portion, a heater supported by the holding portion, a film rotatable around the heater, the film being configured to be heated by sliding on the heater and to heat a toner image on a printing material, and a gap filling member including, on an upstream side with respect to the heater in a direction in which the circumferential surface of the film moves, a first portion disposed between the heater and the holding member and a first contact portion connecting to the first portion and being in contact with the film. A second distance between the first portion and the holding member disposed upstream from the first portion and facing the first portion is smaller than a first distance between the heater and the first portion disposed upstream from the heater and facing the holding member.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: July 28, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada
  • Publication number: 20200192259
    Abstract: A fixing apparatus includes a tubular film, an elongate plate-like heater including a first surface in contact with an inner surface of the film and a second surface opposite to the first surface, the heater being in contact with the inner surface of the film with the second surface, a heat conducting member that is long along the length of the heater and is in contact with the second surface of the heater, and a support member capable of rotating the film while supporting the heater, with the heat conducting member therebetween. The heat conducting member includes an extending portion extending, outside an upstream end of the heater in a rotational direction of the film, in a direction from the second surface of the heater toward the first surface. The extending portion includes a contact portion protruding from the first surface of the heater toward the film into contact therewith.
    Type: Application
    Filed: April 12, 2018
    Publication date: June 18, 2020
    Inventors: Ryo Morihara, Masahiko Suzumi, Tomoo Akizuki, Tatsuya Kinukawa, Takeharu Nakada, Akihito Kanamori, Yusuke Nakazono, Shinji Kubo