Patents by Inventor Yuji Kawaguchi

Yuji Kawaguchi 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: 10493737
    Abstract: Provided are a thermoplastic resin composition whereby gum formation is suppressed during manufacturing of a matte fluororesin molded article such as a film, and a fluorine-based matte film having excellent matte properties and chemical resistance, and a layered film. A thermoplastic resin composition (?) for a chemical-resistant matte film, comprising a fluorine-based resin (A), a matting agent (B) which is a thermoplastic resin insoluble in the fluorine-based resin (A), and a thermoplastic resin (C) soluble in the fluorine-based resin (A). A thermoplastic resin composition (?) containing the fluorine-based resin (A) and an acrylic matting agent (D) which is a thermoplastic resin, the content ratio of alkyl acrylate units with respect to 100% by mass of monofunctional monomer units in the monomer units constituting the matting agent (D) being 50-100% by mass, and the content ratio of other monofunctional monomer units being 0-50% by mass.
    Type: Grant
    Filed: July 14, 2015
    Date of Patent: December 3, 2019
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Yasunori Kawase, Yuji Kawaguchi, Koichiro Sanefuji
  • Patent number: 10452021
    Abstract: A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm3, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: October 22, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Daisuke Miura, Shuhei Iwasaki, Akira Sakakibara, Tatsuya Yamaai, Kazunori Noguchi, Harunobu Ogaki, Kazunari Hagiwara, Yuji Kawaguchi
  • Publication number: 20190302638
    Abstract: An image forming apparatus includes image forming units each of which includes an image bearing member, a contact charging member, and a developer bearing member of a toner, applies a charging bias in a direction in which the toner moves from the image bearing member to the charging member in an image forming period, and applied a charging bias of an opposite polarity relative to that in the image formation in a cleaning period, and collects the toner by the developer bearing member. In consecutive image formation, a charging bias in the image forming period is applied in a first interval period and which is between first and second image forming periods and a second interval period which is between second and third image forming periods. An absolute value of a charging bias applied in the second interval period is larger than that applied in the first interval period.
    Type: Application
    Filed: March 25, 2019
    Publication date: October 3, 2019
    Inventors: Masanori Tanaka, Kazuhiro Okubo, Takahiro Kawamoto, Yuji Kawaguchi, Jun Miura
  • Publication number: 20190265625
    Abstract: In an image forming apparatus which includes a plurality of image forming units each including an image bearing member, a contact charging member, and a developer bearing member for forming toner of normal polarity, and which, in a printing operation, applies a charging bias having a first direction, in a cleaning operation, applies a charging bias having a second direction, and recovers residual toner remaining on the image bearing member without used for printing by the developer bearing member, before performing the cleaning operation, when successively performing the printing operation on a plurality of recording materials including a first recording material and a second recording material, which is used for printing following the first recording material, the charging voltage larger in absolute value in the printing operation for the second recording material than in the printing operation for the first recording material is applied.
    Type: Application
    Filed: February 26, 2019
    Publication date: August 29, 2019
    Inventors: Kazuhiro Okubo, Masanori Tanaka, Takahiro Kawamoto, Yuji Kawaguchi, Jun Miura
  • Publication number: 20190235408
    Abstract: An image forming apparatus using a contact charging method includes a control unit capable of executing cleaning in a post-rotation step at the end of a job and in an inter-image step during execution of the job. The cleaning involves moving toner adhering to a charging member from the charging member to an image bearing member. The job is a series of operations started by a predetermined start instruction and involving forming an image on one or more recording materials and outputting the one or more recording materials. When an instruction to start the next job is input during execution of cleaning in the post-rotation step, the control unit stops the cleaning in the middle of the execution, starts the next job, and adjusts timing for executing subsequent cleaning on the basis of information relating to the amount of cleaning executed before being stopped in the middle of the execution.
    Type: Application
    Filed: April 11, 2019
    Publication date: August 1, 2019
    Inventors: Takahiro Kawamoto, Kazuhiro Okubo, Yuji Kawaguchi, Masanori Tanaka, Jun Miura
  • Publication number: 20190226902
    Abstract: Provided is a weighing apparatus with a flowmeter function includes a load sensor unit configured to detect a load of a flow rate calculation target, an A/D conversion unit configured to sequentially convert load signals from the load sensor unit into digital load data at predetermined intervals, an arithmetic processing unit configured to sequentially convert the load data into weighed values to calculate flow rate values, and a storage unit for storing the weighed values. The arithmetic processing unit calculates change amounts in weighed values and calculates a flow rate value based on a flow rate calculation cycle set based on a minimum time by which the change amounts become equal to or more than a change amount in weighed value, the change amount being calculated based on a minimum indication of weighed value and the required resolution of weighed value and satisfying a required resolution.
    Type: Application
    Filed: January 15, 2019
    Publication date: July 25, 2019
    Inventors: Yuji FUKAMI, Haruna KAWAGUCHI
  • Publication number: 20190163120
    Abstract: A process cartridge configured to be detachably attachable to a main body of an electrophotographic image forming apparatus, in which an occurrence of an image failure is suppressed, wherein the process cartridge includes an electrophotographic photosensitive member and a cleaning member arranged in contact with the electrophotographic photosensitive member, wherein an elastic deformation modulus of a surface layer of the electrophotographic photosensitive member is 35% or larger, and the cleaning member is formed of a urethane foam, wherein a density of the urethane foam is 200 to 500 kg/cm3, and a 25% compressive load of the urethane foam is 0.3 MPa or smaller.
    Type: Application
    Filed: November 21, 2018
    Publication date: May 30, 2019
    Inventors: Daisuke Miura, Shuhei Iwasaki, Akira Sakakibara, Tatsuya Yamaai, Kazunori Noguchi, Harunobu Ogaki, Kazunari Hagiwara, Yuji Kawaguchi
  • Patent number: 10295926
    Abstract: An image forming apparatus using a contact charging method includes a control unit capable of executing cleaning in a post-rotation step at the end of a job and in an inter-image step during execution of the job. The cleaning involves moving toner adhering to a charging member from the charging member to an image bearing member. The job is a series of operations started by a predetermined start instruction and involving forming an image on one or more recording materials and outputting the one or more recording materials. When an instruction to start the next job is input during execution of cleaning in the post-rotation step, the control unit stops the cleaning in the middle of the execution, starts the next job, and adjusts timing for executing subsequent cleaning on the basis of information. relating to the amount of cleaning executed before being stopped in the middle of the execution.
    Type: Grant
    Filed: June 26, 2018
    Date of Patent: May 21, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Takahiro Kawamoto, Kazuhiro Okubo, Yuji Kawaguchi, Masanori Tanaka, Jun Miura
  • Publication number: 20190137910
    Abstract: A voltage maintenance element is connected to a contact member that contacts a primary transfer surface area of an intermediate transfer belt to which toner images are transferred from a plurality of image carriers between stretch members, in such a way as to prevent the electric potential of the intermediate transfer belt from varying between respective stations.
    Type: Application
    Filed: December 17, 2018
    Publication date: May 9, 2019
    Inventors: Shinji Katagiri, Yuji Kawaguchi, Masaru Ohno, Tsuguhiro Yoshida, Takeo Kawanami, Taro Minobe, Masaru Shimura
  • Patent number: 10254694
    Abstract: A control unit of an image forming apparatus controls, in an image forming mode, a potential difference obtained by subtracting the voltage applied to the developer bearing member from the voltage applied to the regulating member so that the potential difference is set to the polarity of the developer, and the control unit controls, in a lubricant discharge mode, the potential difference obtained by subtracting the voltage applied to the developer bearing member from the voltage applied to the regulating member so that the potential difference is set to the polarity of the lubricant or “0”.
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: April 9, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Miura, Kazuhiro Okubo, Takahiro Kawamoto, Yuji Kawaguchi, Masanori Tanaka
  • Patent number: 10241445
    Abstract: An image forming apparatus operable in a mode of forming an image using only a part of image forming stations. In the mode, a developing device contacts an image bearing member in a part of the image forming stations, and the developing device is spaced from the image bearing member in the rest of the image forming stations. The contact pressure between the image bearing member and a transferring device is made smaller in the rest than in the part. The image forming operation in the mode is executed while the image bearing members of the part and the rest are rotated. A controller is configured such that when the operation in the mode is continuously executed for a time period longer than a predetermined period, the contact pressure in the rest is made larger than the above-mentioned smaller contact pressure.
    Type: Grant
    Filed: January 11, 2018
    Date of Patent: March 26, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shunsuke Mizukoshi, Takaaki Shinkawa, Jun Miura, Takahiro Ikeda, Yuji Kawaguchi
  • Publication number: 20190079429
    Abstract: In an image forming apparatus, a control unit performs a control to cause an exposing unit to expose a plurality of image bearing members at different times to form exposure regions on a plurality of image bearing members, to acquire results acquired by applying direct current voltage lower than discharge start voltage to a plurality of abutting members by an applying unit when the exposure region pass by the abutting parts against the abutting members and detected by a detecting unit, and to, based on the acquired results of the detections, acquire information regarding the surface potentials of the a plurality of image bearing members.
    Type: Application
    Filed: August 30, 2018
    Publication date: March 14, 2019
    Inventors: Yuji Kawaguchi, Kazuhiro Okubo, Takahiro Kawamoto, Masanori Tanaka, Jun Miura
  • Publication number: 20190079431
    Abstract: An image forming apparatus includes an image bearing member, a charging unit that charges the image bearing member by discharge, a developing unit that rotates while being in contact with the image bearing member and supplies a developer to the image bearing member, a transfer unit that transfers a developer image from the image bearing member to a transferred member, a detecting unit that detects an electric current flowing or a voltage generated when a direct-current voltage less than a discharge starting voltage is applied to a contact member in contact with the image bearing member, and a control unit that executes detection using the detecting unit in a non-image-forming period, wherein when the detection result satisfies a first condition, the control unit starts a rotating operation for rotating the developing member, and wherein when the detection result satisfies a second condition, the control unit terminates the rotating operation.
    Type: Application
    Filed: September 4, 2018
    Publication date: March 14, 2019
    Inventors: Takayuki Namiki, Yuji Kawaguchi
  • Patent number: 10216143
    Abstract: An image forming apparatus includes a cartridge having an image bearing member and a developer bearing member that bears a developer, and a detection unit configured to detect if the cartridge is new. A lubricant of a polarity opposite to a polarity of the developer is coated on the developer bearing member, and if the cartridge is detected to be new, prior to start of an image forming operation, a discharging operation of discharging the lubricant from a surface of the developer bearing member onto the image bearing member is performed. When a predetermined time elapses from a start of the discharging operation and before an end of the discharging operation, a potential difference between a surface potential of the image bearing member and a surface potential of the developer bearing member is set smaller than when the discharging operation is started.
    Type: Grant
    Filed: December 14, 2017
    Date of Patent: February 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuji Kawaguchi, Satoru Motohashi
  • Patent number: 10197939
    Abstract: An image forming apparatus has a control portion configured to control a charging bias to be applied to a charging member and a first exposure amount with respect to humidity inside an image forming apparatus and a thickness of a photosensitive layer of a photoreceptor, and the control portion controls the charging bias and the first exposure amount so that a potential difference between a non-image forming portion and the charging member increases as the humidity decreases, and decreases as the humidity increases.
    Type: Grant
    Filed: December 13, 2017
    Date of Patent: February 5, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventor: Yuji Kawaguchi
  • Publication number: 20190018337
    Abstract: An image forming apparatus using a contact charging method includes a control unit capable of executing cleaning in a post-rotation step at the end of a job and in an inter-image step during execution of the job. The cleaning involves moving toner adhering to a charging member from the charging member to an image bearing member. The job is a series of operations started by a predetermined start instruction and involving forming an image on one or more recording materials and outputting the one or more recording materials. When an instruction to start the next job is input during execution of cleaning in the post-rotation step, the control unit stops the cleaning in the middle of the execution, starts the next job, and adjusts timing for executing subsequent cleaning on the basis of information. relating to the amount of cleaning executed before being stopped in the middle of the execution.
    Type: Application
    Filed: June 26, 2018
    Publication date: January 17, 2019
    Inventors: Takahiro Kawamoto, Kazuhiro Okubo, Yuji Kawaguchi, Masanori Tanaka, Jun Miura
  • Patent number: 10180643
    Abstract: A voltage maintenance element is connected to a contact member that contacts a primary transfer surface area of an intermediate transfer belt to which toner images are transferred from a plurality of image carriers between stretch members, in such a way as to prevent the electric potential of the intermediate transfer belt from varying between respective image forming stations.
    Type: Grant
    Filed: October 16, 2017
    Date of Patent: January 15, 2019
    Assignee: Canon Kabushiki Kaisha
    Inventors: Shinji Katagiri, Yuji Kawaguchi, Masaru Ohno, Tsuguhiro Yoshida, Takeo Kawanami, Taro Minobe, Masaru Shimura
  • Publication number: 20180299810
    Abstract: A control unit of an image forming apparatus controls, in an image forming mode, a potential difference obtained by subtracting the voltage applied to the developer bearing member from the voltage applied to the regulating member so that the potential difference is set to the polarity of the developer, and the control unit controls, in a lubricant discharge mode, the potential difference obtained by subtracting the voltage applied to the developer bearing member from the voltage applied to the regulating member so that the potential difference is set to the polarity of the lubricant or “0”.
    Type: Application
    Filed: April 4, 2018
    Publication date: October 18, 2018
    Inventors: Jun Miura, Kazuhiro Okubo, Takahiro Kawamoto, Yuji Kawaguchi, Masanori Tanaka
  • Patent number: 10015466
    Abstract: A spatial information visualization apparatus in an embodiment includes a storage, a vacant space processor, a spatial information generator, and an image generator. The storage stores design dimensions of a target space, and measurement information indicating coordinates of a measurement point of the target space measured by scanning the target space from a plurality of different reference points in the target space, for each of the reference points. The vacant space processor specifies a vacant space existing in the measured space stored in the storage, on the basis of the coordinates of the measurement point of the target space included in the measurement information read for each of the reference points from the storage, coordinates of the reference point, and the design dimensions of the space.
    Type: Grant
    Filed: January 11, 2016
    Date of Patent: July 3, 2018
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshihiro Maruyama, Makoto Hatakeyama, Yuji Kawaguchi, Tetsuo Endoh, Shohei Matsumoto
  • Publication number: 20180136591
    Abstract: An image forming apparatus operable in a mode of forming an image using only a part of image forming stations. In the mode, a developing device contacts an image bearing member in a part of the image forming stations, and the developing device is spaced from the image bearing member in the rest of the image forming stations. The contact pressure between the image bearing member and a transferring device is made smaller in the rest than in the part. The image forming operation in the mode is executed while the image bearing members of the part and the rest are rotated. A controller is configured such that when the operation in the mode is continuously executed for a time period longer than a predetermined period, the contact pressure in the rest is made larger than the above-mentioned smaller contact pressure.
    Type: Application
    Filed: January 11, 2018
    Publication date: May 17, 2018
    Inventors: Shunsuke Mizukoshi, Takaaki Shinkawa, Jun Miura, Takahiro Ikeda, Yuji Kawaguchi