Patents by Inventor Tatsuya Kubo

Tatsuya Kubo 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: 10126682
    Abstract: A developing device includes a casing to contain developer, a developer bearer disposed in the casing and opposite a latent image bearer in a developing range, at least one developer contact face to which the developer adheres in image formation, and a vibrator to give vibration to the developer contact face in a non-image formation period. The developer bearer is to rotate to supply the developer to the latent image bearer in the developing range.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: November 13, 2018
    Assignee: RICOH COMPANY, LTD.
    Inventors: Hiroaki Okamoto, Tatsuya Kubo, Junichi Matsumoto, Shinji Tamaki, Ichiro Kadota
  • Patent number: 10008722
    Abstract: An object of the present invention is to provide a positive-electrode active material comprising a carbon-sulfur structure which has Raman shift peaks at around 500 cm?1, at around 1,250 cm?1 and at around 1,450 cm?1 in a Raman spectrum, and by using the positive-electrode active material, it is possible to greatly improve cycling characteristics of a lithium-ion secondary battery.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: June 26, 2018
    Assignees: SUMITOMO RUBBER INDUSTRIES, LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Kazuo Hochi, Tatsuya Kubo, Tetsuo Sakai, Toshikatsu Kojima
  • Publication number: 20180151879
    Abstract: An object of the present disclosure is to provide a secondary battery having excellent cyclability by using a sulfur-based active material as a negative-electrode active material while preventing a reaction between an elated polysulfide and a positive electrode. The metal-ion secondary battery comprises a negative electrode comprising a sulfur-containing compound as a negative-electrode active material, a positive electrode and an electrolyte, and has a polymer gel layer on a surface of the positive electrode.
    Type: Application
    Filed: October 25, 2017
    Publication date: May 31, 2018
    Applicant: SUMITOMO RUBBER INDUSTRIES, LTD.
    Inventors: Tatsuya KUBO, Akihiro YAMANO, Masanori MORISHITA, Tetsuo SAKAI, Hideya YOSHITAKE
  • Publication number: 20180120737
    Abstract: A developing device includes a casing to contain developer, a developer bearer disposed in the casing and opposite a latent image bearer in a developing range, at least one developer contact face to which the developer adheres in image formation, and a vibrator to give vibration to the developer contact face in a non-image formation period. The developer bearer is to rotate to supply the developer to the latent image bearer in the developing range.
    Type: Application
    Filed: August 28, 2017
    Publication date: May 3, 2018
    Applicant: Ricoh Company, Ltd.
    Inventors: Hiroaki OKAMOTO, Tatsuya KUBO, Junichi MATSUMOTO, Shinji TAMAKI, Ichiro KADOTA
  • Patent number: 9897938
    Abstract: A developing device includes a developer bearer to carry, by rotation, developer to a developing range, a casing including a developer container to contain the developer and housing the developer bearer, a gap retainer adjacent to the developer container and downstream from the developing range in a rotation direction of the developer bearer, an opposing wall opposing an end face of the gap retainer in an axial direction of the developer bearer, a first seal disposed between the end face of the gap retainer and the opposing wall, and a contact portion disposed adjacent to an end portion of the gap retainer in the axial direction of the developer bearer. The gap retainer secures a predetermined gap between the developer bearer and the gap retainer. The contact portion contacts, via a second seal, the gap retainer in a direction intersecting the axial direction of the developer bearer.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: February 20, 2018
    Assignee: Ricoh Company, Ltd.
    Inventors: Shinnosuke Koshizuka, Koichi Yamazaki, Tatsuya Kubo, Atsushi Nakamoto, Nobuo Takami, Kazunori Suzuki, Naohiro Kawashima
  • Publication number: 20170363987
    Abstract: A powder container includes a powder chamber for containing powder for forming images, a powder outlet formed in a face of the powder container, and a shutter assembly to open and close the powder outlet and including first and second shutters. The first shutter is movable between a sealing position to close the powder outlet and an open position to open the powder outlet and includes a pressed member to cancel retention of the first shutter at the sealing position. The second shutter includes a pressing projection that interferes with the pressed member of the first shutter and is movable between a shielding position to cover the pressed member without interference between the pressing projection and the pressed member and a releasing position to press the pressed member with the pressing projection.
    Type: Application
    Filed: August 30, 2017
    Publication date: December 21, 2017
    Inventors: Kentaro NODERA, Emi KITA, Akihiro TAKAYAMA, Susumu TATEYAMA, Shinnosuke KOSHIZUKA, Tatsuya KUBO, Teppei KIKUCHI
  • Patent number: 9835977
    Abstract: A powder container includes a powder chamber for containing powder for forming images, a powder outlet formed in a face of the powder container, and a shutter assembly to open and close the powder outlet and including first and second shutters. The first shutter is movable between a sealing position to close the powder outlet and an open position to open the powder outlet and includes a pressed member to cancel retention of the first shutter at the sealing position. The second shutter includes a pressing projection that interferes with the pressed member of the first shutter and is movable between a shielding position to cover the pressed member without interference between the pressing projection and the pressed member and a releasing position to press the pressed member with the pressing projection.
    Type: Grant
    Filed: August 25, 2016
    Date of Patent: December 5, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Kentaro Nodera, Emi Kita, Akihiro Takayama, Susumu Tateyama, Shinnosuke Koshizuka, Tatsuya Kubo, Teppei Kikuchi
  • Patent number: 9817335
    Abstract: A powder amount detector includes a vibration plate secured to a powder container to contain powder and positioned at a predetermined position in a stationary state, a shaft to rotate inside the powder container, a contact member attached to the shaft, a vibration detector to detect vibration of the vibration plate, and a detection result processor to determine an amount of the powder in the powder container according to a detection result generated by the vibration detector. The contact member is to flip the vibration plate to cause the vibration plate to repeat elastic deformation and reversion to vibrate. The contact member is to exit an area opposed to the vibration plate after the contact member flips the vibration plate by the time the vibration plate returns to the predetermined position.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: November 14, 2017
    Assignee: Ricoh Company, Ltd.
    Inventors: Naohiro Kawashima, Koichi Yamazaki, Nobuo Takami, Atsushi Nakamoto, Shinnosuke Koshizuka, Tatsuya Kubo, Kazunori Suzuki, Hiroshi Hosokawa, Tetsuro Hirota, Kenji Kikuchi
  • Publication number: 20170288225
    Abstract: An object of the present invention is to provide a novel sulfur-based positive electrode active material for a lithium-ion secondary battery which is excellent in cyclability and can largely improve a charging and discharging capacity, a positive electrode comprising the positive electrode active material and a lithium-ion secondary battery made using the positive electrode. The sulfur-based positive electrode active material is obtainable by subjecting a starting material comprising a polymer, sulfur and an organometallic compound dispersed in a form of fine particles to heat-treatment under a non-oxidizing atmosphere, wherein the particles of metallic sulfide resulting from sulfurization of the organometallic compound are dispersed in the heat-treated material, and particle size of the metallic sulfide particles is not less than 10 nm and less than 100 nm.
    Type: Application
    Filed: March 6, 2017
    Publication date: October 5, 2017
    Applicants: SUMITOMO RUBBER INDUSTRIES, LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Tatsuya KUBO, Akihiro YAMANO, Naoto YAMASHITA, Masahiro YANAGIDA
  • Publication number: 20170168421
    Abstract: A developing device includes a developer bearer to carry, by rotation, developer to a developing range, a casing including a developer container to contain the developer and housing the developer bearer, a gap retainer adjacent to the developer container and downstream from the developing range in a rotation direction of the developer bearer, an opposing wall opposing an end face of the gap retainer in an axial direction of the developer bearer, a first seal disposed between the end face of the gap retainer and the opposing wall, and a contact portion disposed adjacent to an end portion of the gap retainer in the axial direction of the developer bearer. The gap retainer secures a predetermined gap between the developer bearer and the gap retainer. The contact portion contacts, via a second seal, the gap retainer in a direction intersecting the axial direction of the developer bearer.
    Type: Application
    Filed: December 5, 2016
    Publication date: June 15, 2017
    Inventors: Shinnosuke KOSHIZUKA, Koichi YAMAZAKI, Tatsuya KUBO, Atsushi NAKAMOTO, Nobuo TAKAMI, Kazunori SUZUKI, Naohiro KAWASHIMA
  • Publication number: 20170168418
    Abstract: A powder supply device that includes a powder reservoir including a rotator having a rotation shaft, to store powder supplied from a powder container; and a powder amount detector. The powder amount detector includes a detected member disposed in the powder reservoir, a contact member attached to the rotation shaft, to contact the detected member to vibrate or move the detected member, a detector to detect vibration or a displacement of the detected member, and a detection result processor to detect the amount of the powder in the powder reservoir based on detection by the detector. The powder supply device further includes a controller to supply the powder from the powder container to the powder reservoir based on detection by the powder amount detector. The controller rotates the rotator in discharging the powder from the powder reservoir and supplying the powder from the powder container to the powder reservoir.
    Type: Application
    Filed: December 6, 2016
    Publication date: June 15, 2017
    Inventors: Nobuo TAKAMI, Tetsuro HIROTA, Kenji KIKUCHI, Koichi YAMAZAKI, Atsushi NAKAMOTO, Naohiro KAWASHIMA, Tatsuya KUBO, Shinnosuke KOSHIZUKA, Kazunori SUZUKI
  • Publication number: 20170149063
    Abstract: An object of the present invention is to provide a novel positive electrode which is produced using a rubber being an inexpensive material and is capable of enhancing a charge and discharge capacity and cyclability of a lithium-ion secondary battery, and the lithium-ion secondary battery composed of the positive electrode. In the lithium-ion secondary battery, the positive electrode comprises a current collector and an electrode layer formed on a surface of the current collector, the electrode layer comprises an active material, an electrically-conductive additive and a thermosetting resin binder subjected to thermosetting, and the active material comprises a sulfur-based positive-electrode active material prepared by heat-treating a starting material comprising a rubber and sulfur under a non-oxidizing atmosphere.
    Type: Application
    Filed: October 20, 2016
    Publication date: May 25, 2017
    Applicants: SUMITOMO RUBBER INDUSTRIES, LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Tatsuya KUBO, Akihiro YAMANO, Naoto YAMASHITA, Toshikatsu KOJIMA, Masahiro YANAGIDA
  • Publication number: 20170115597
    Abstract: A powder amount detector includes a vibration plate secured to a powder container to contain powder and positioned at a predetermined position in a stationary state, a shaft to rotate inside the powder container, a contact member attached to the shaft, a vibration detector to detect vibration of the vibration plate, and a detection result processor to determine an amount of the powder in the powder container according to a detection result generated by the vibration detector. The contact member is to flip the vibration plate to cause the vibration plate to repeat elastic deformation and reversion to vibrate. The contact member is to exit an area opposed to the vibration plate after the contact member flips the vibration plate by the time the vibration plate returns to the predetermined position.
    Type: Application
    Filed: September 29, 2016
    Publication date: April 27, 2017
    Inventors: NAOHIRO KAWASHIMA, KOICHI YAMAZAKI, NOBUO TAKAMI, ATSUSHI NAKAMOTO, SHINNOSUKE KOSHIZUKA, TATSUYA KUBO, KAZUNORI SUZUKI, HIROSHI HOSOKAWA, TETSURO HIROTA, KENJI KIKUCHI
  • Publication number: 20170062809
    Abstract: An object of the present invention is to provide a novel sulfur-based positive-electrode active material which can largely improve cyclability of a lithium-ion secondary battery, a positive electrode comprising the positive-electrode active material and a lithium-ion secondary battery comprising the positive electrode. The sulfur-based positive-electrode active material is one comprising: a carbon skeleton derived from a polymer composed of a monomer unit having at least one hetero atom-containing moiety, and sulfur incorporated into the carbon skeleton as the carbon skeleton is formed from the polymer by heat treatment.
    Type: Application
    Filed: August 3, 2016
    Publication date: March 2, 2017
    Applicants: SUMITOMO RUBBER INDUSTRIES, LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Tatsuya KUBO, Toshikatsu KOJIMA, Tetsuo SAKAI, Akihiro YAMANO, Masahiro YANAGIDA
  • Publication number: 20160363887
    Abstract: A powder container includes a powder chamber for containing powder for forming images, a powder outlet formed in a face of the powder container, and a shutter assembly to open and close the powder outlet and including first and second shutters. The first shutter is movable between a sealing position to close the powder outlet and an open position to open the powder outlet and includes a pressed member to cancel retention of the first shutter at the sealing position. The second shutter includes a pressing projection that interferes with the pressed member of the first shutter and is movable between a shielding position to cover the pressed member without interference between the pressing projection and the pressed member and a releasing position to press the pressed member with the pressing projection.
    Type: Application
    Filed: August 25, 2016
    Publication date: December 15, 2016
    Inventors: Kentaro NODERA, Emi KITA, Akihiro TAKAYAMA, Susumu TATEYAMA, Shinnosuke KOSHIZUKA, Tatsuya KUBO, Teppei KIKUCHI
  • Patent number: 9471009
    Abstract: A developer container includes a container body, a rotary shaft, a rotary stirrer, and a flexible blade. The container body contains developer and has a discharge port. The rotary stirrer includes a rotary support and rotates about the rotary shaft to stir and transport the developer. The rotary support includes a base end rotatable integrally with the rotary shaft, a free end spaced away from an inner wall of the container body, and a holding surface provided at the free end or at a position shifted toward the rotary shaft away from the free end. The holding surface is parallel to or inclined relative to a rotation direction of the rotary support. The flexible blade includes a base end portion held on the holding surface and a distal end to contact the inner wall and transport the developer to the discharge port.
    Type: Grant
    Filed: March 9, 2015
    Date of Patent: October 18, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Teppei Kikuchi, Hideki Kosugi, Tatsuya Kubo, Shinnosuke Koshizuka, Kazunori Suzuki, Atsushi Nakamoto
  • Publication number: 20160293955
    Abstract: An object of the present invention is to provide a positive-electrode active material comprising a carbon-sulfur structure which has Raman shift peaks at around 500 cm?1, at around 1,250 cm?1 and at around 1,450 cm?1 in a Raman spectrum, and by using the positive-electrode active material, it is possible to greatly improve cycling characteristics of a lithium-ion secondary battery.
    Type: Application
    Filed: September 29, 2014
    Publication date: October 6, 2016
    Applicants: SUMITOMO RUBBER INDUSTRIES, LTD., NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Kazuo HOCHI, Tatsuya KUBO, Tetsuo SAKAI, Toshikatsu KOJIMA
  • Patent number: 9459556
    Abstract: A powder container includes a powder chamber for containing powder for forming images, a powder outlet formed in a face of the powder container, and a shutter assembly to open and close the powder outlet and including first and second shutters. The first shutter is movable between a sealing position to close the powder outlet and an open position to open the powder outlet and includes a pressed member to cancel retention of the first shutter at the sealing position. The second shutter includes a pressing projection that interferes with the pressed member of the first shutter and is movable between a shielding position to cover the pressed member without interference between the pressing projection and the pressed member and a releasing position to press the pressed member with the pressing projection.
    Type: Grant
    Filed: August 11, 2015
    Date of Patent: October 4, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Kentaro Nodera, Emi Kita, Akihiro Takayama, Susumu Tateyama, Shinnosuke Koshizuka, Tatsuya Kubo, Teppei Kikuchi
  • Patent number: 9400450
    Abstract: A toner cartridge includes a toner container to store toner and two rotary agitation members to rotate to agitate toner in the toner container. The toner container has two arc-shaped portions adjacent to each other at an inner bottom wall of the toner container. The two rotary agitation members has edges to rotate along the two arc-shaped portions with rotation phases thereof shifted from each other. The two rotary agitation members are placed with rotation trajectories thereof partially overlapping each other.
    Type: Grant
    Filed: July 17, 2015
    Date of Patent: July 26, 2016
    Assignee: Ricoh Company, Ltd.
    Inventors: Teppei Kikuchi, Hideki Kosugi, Tatsuya Kubo, Akira Fujimori, Kentaro Nodera, Shinnosuke Koshizuka
  • Publication number: 20160195846
    Abstract: A developing device includes a developer bearer, a casing including a bearing support and a developer container, a developer conveyor to transport, by rotation, developer in the developer container, a bearing to fit in the bearing support and support a shaft of the developer conveyor rotatably on the casing, and a heat conductor made of a material higher in thermal conductivity than the bearing support and including a heat absorbing portion to contact the bearing and absorb heat from the bearing and a heat dissipating portion to release the heat. The bearing includes an outer ring secured to the bearing support, an inner ring to rotate together with the shaft of the developer conveyor, and a ball disposed between the outer ring and the inner ring. The heat conductor is disposed to contact the outer ring of the bearing and contactless with the inner ring and the ball.
    Type: Application
    Filed: December 29, 2015
    Publication date: July 7, 2016
    Inventors: Shinnosuke KOSHIZUKA, Koichi YAMAZAKI, Tatsuya KUBO, Atsushi NAKAMOTO, Teppei KIKUCHI, Kazunori SUZUKI, Naohiro KAWASHIMA