Patents by Inventor Hiromichi Ohashi

Hiromichi Ohashi 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: 9570436
    Abstract: The present invention provides a semiconductor device that prevents destruction due to an avalanche breakdown and that has a high tolerance against breakdown by configuring the device so as to have a punch-through breakdown function therein and such that the breakdown voltage of a punch-through breakdown is lower than an avalanche breakdown voltage so that an avalanche breakdown does not occur.
    Type: Grant
    Filed: June 5, 2013
    Date of Patent: February 14, 2017
    Assignee: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY
    Inventors: Akira Nakajima, Shinichi Nishizawa, Hiromichi Ohashi
  • Publication number: 20150249403
    Abstract: [Solution] An actually used flying capacitor-type multilevel power conversion circuit has variations in the characteristics of main semiconductor switches, and includes parasitic elements such as parasitic resistance, parasitic capacity, and parasitic inductance in the circuit, which causes flying capacitors to be charged and discharged to different quantities contrary to ideal case, making it necessary to have voltage sensors for flying capacitor voltage detection and a main semiconductor switch control mechanism in order to suppress fluctuation of the flying capacitor voltages from prescribed values. Furthermore, this circuit becomes unpractical when the number of levels is increased.
    Type: Application
    Filed: September 9, 2013
    Publication date: September 3, 2015
    Inventors: Yukihiko Sato, Hidemine Obara, Hiromichi Ohashi, Akira Nakajima, Shinichi Nishizawa
  • Publication number: 20150155273
    Abstract: The present invention provides a semiconductor device that prevents destruction due to an avalanche breakdown and that has a high tolerance against breakdown by configuring the device so as to have a punch-through breakdown function therein and such that the breakdown voltage of a punch-through breakdown is lower than an avalanche breakdown voltage so that an avalanche breakdown does not occur.
    Type: Application
    Filed: June 5, 2013
    Publication date: June 4, 2015
    Applicant: National Institute of Advanced Industrial Science and Technology
    Inventors: Akira Nakajima, Shinichi Nishizawa, Hiromichi Ohashi
  • Patent number: 8363441
    Abstract: To realize power supply to each gate drive circuit without using an individual dedicated power supply for each gate drive circuit. A power conversion apparatus includes an individual drive unit that does not require a dedicated power supply, and includes gate drivers connected to switches and interface circuits and a power converter gate drive configured with a common power supply for supplying power to the gate drive unit. Power is supplied from main circuits or a number of common power supplies fewer than that of the number of the switches through one or more power supply terminals included in the interface circuit. Also, the signal can be transmitted by isolation from a signal source to the gate drivers.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: January 29, 2013
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Hiromichi Ohashi, Yukihiko Sato, Kyungmin Sung, Masamu Kamaga, Moe Imaizumi
  • Patent number: 8351224
    Abstract: A power conversion apparatus includes a main circuit with switches, and performs power conversion to generate power to a three-phase AC load from a three- or single-phase AC power supply. Some of the switches are configured, using a bidirectional switch including a normally-on device that is turned OFF when a gate circuit is provided with a positive or negative voltage, and a normally-off device that is turned ON when the gate circuit is provided with a positive or negative voltage, to provide only a specific unidirectional current flow when the gate circuit is not activated, and when the gate circuit is activated, provide and control a bidirectional current flow to direct only in an arbitrary unidirectional way. By providing the power conversion apparatus with a capability of directing back, to a load (motor), any power coming therefrom, the conversion apparatus requires no direct-current link capacitor and a diode clamping circuit.
    Type: Grant
    Filed: July 21, 2009
    Date of Patent: January 8, 2013
    Assignee: National Institute of Advanced Industrial Science and Technology
    Inventors: Hiromichi Ohashi, Kyungmin Sung, Masamu Kamaga, Mitsuaki Shimizu
  • Patent number: 8149376
    Abstract: The test data processing apparatus of the present invention is a test data processing apparatus for processing test data obtained by testing defects of a sheet-shaped product having at least an optical film which is a member of an optical displaying apparatus, comprising a defect information preparing section, wherein, on the basis of surface defect test data relating to a surface defect and bright point test data relating to a bright point obtained when the optical film or a laminate body containing the optical film is regarded as an object of testing, in a case that a position of the surface defect and a position of the bright point are identical, the surface defect and the bright point located at the identical position are not regarded as a defect for processing by the defect information preparing section.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: April 3, 2012
    Assignee: Nitto Denko Corporation
    Inventor: Hiromichi Ohashi
  • Patent number: 8078307
    Abstract: A defect testing apparatus for testing defects of optical film sheet-shaped product of an optical displaying apparatus, which includes a defect detecting means for detecting defects of a monolayer body and/or a laminate body constituting the sheet-shaped product in a state in which a protective layer on a surface of the sheet-shaped product is not disposed and defect information preparing means for preparing defect information which is information related to the defects detected by the defect detecting means, and the defect information is used for producing the sheet-shaped product provided in a roll form or in separate sheets.
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: December 13, 2011
    Assignee: Nitto Denko Corporation
    Inventor: Hiromichi Ohashi
  • Patent number: 8045151
    Abstract: A first inspection process of inspecting presence of a defect on a front surface of a film body with a protective film separated therefrom; a separator removing process of separating a separator from the inspected laminated film; a second inspection process of inspecting presence of the defect in the film body in a vertical attitude while introducing the film body with the separator separated and removed therefrom to a film travel path directed in a vertical direction, and storing detection data; a separator laminating process and a protective film laminating process of laminating a separator and a protective film to a back surface and a front surface of the inspected film body, respectively; and a film collecting process of winding up the inspected laminated film laminated with the protective film and the separator are provided.
    Type: Grant
    Filed: August 12, 2008
    Date of Patent: October 25, 2011
    Assignee: Nitto Denko Corporation
    Inventors: Hiromichi Ohashi, Kosuke Sato
  • Patent number: 7922843
    Abstract: A strip-shaped polarizing film has a protective film strip conformably adhered to one surface thereof and a releasable liner conformably adhered to the other surface thereof and delivered from a film delivering station 1. After an appearance inspection, a lamination of the protective film strip and the polarizing film strip F is half-cut using a laser unit 11 to form an array of laminations each consisting of a protective film and a polarizing film F, with the releasable liner being left intact. Then, the polarizing films F are fed to a peeling mechanism 4. The peeling mechanism 4 feeds a forwardmost one the polarizing films F to a laminating mechanism 5 while peeling off the releasable liner therefrom by a knife-edged member. The forwardmost polarizing film F is laminated to a liquid-crystal panel W conveyed to the laminating mechanism by a panel transport apparatus 18 in synchronization of the feeding of the forwardmost polarizing film F.
    Type: Grant
    Filed: April 13, 2009
    Date of Patent: April 12, 2011
    Assignee: Nitto Denko Corporation
    Inventors: Kazuo Kitada, Yoshihiro Kameda, Kanji Nishida, Tomokazu Yura, Takaichi Amano, Hiromichi Ohashi, Atsushi Hino, Naoyuki Matsuo
  • Patent number: 7913734
    Abstract: A strip-shaped polarizing film has a protective film strip conformably adhered to one surface thereof and a releasable liner conformably adhered to the other surface thereof and delivered from a film delivering station 1. After an appearance inspection, a lamination of the protective film strip and the polarizing film strip F is half-cut using a laser unit 11 to form an array of laminations each consisting of a protective film and a polarizing film F, with the releasable liner being left intact. Then, the polarizing films F are fed to a peeling mechanism 4. The peeling mechanism 4 feeds a forwardmost one the polarizing films F to a laminating mechanism 5 while peeling off the releasable liner therefrom by a knife-edged member. The forwardmost polarizing film F is laminated to a liquid-crystal panel W conveyed to the laminating mechanism by a panel transport apparatus 18 in synchronization of the feeding of the forwardmost polarizing film F.
    Type: Grant
    Filed: July 26, 2010
    Date of Patent: March 29, 2011
    Assignee: Nitto Denko Corporation
    Inventors: Kazuo Kitada, Yoshihiro Kameda, Kanji Nishida, Tomokazu Yura, Takaichi Amano, Hiromichi Ohashi, Atsushi Hino, Naoyuki Matsuo
  • Patent number: 7908026
    Abstract: A defect testing apparatus for testing defects of optical film sheet-shaped product of an optical displaying apparatus, which includes a defect detecting means for detecting defects of a monolayer body and/or a laminate body constituting the sheet-shaped product in a state in which a protective layer on a surface of the sheet-shaped product is not disposed and defect information preparing means for preparing defect information which is information related to the defects detected by the defect detecting means, and the defect information is used for producing the sheet-shaped product provided in a roll form or in separate sheets.
    Type: Grant
    Filed: October 10, 2007
    Date of Patent: March 15, 2011
    Assignee: NITTO DENKO CORPORATION
    Inventor: Hiromichi Ohashi
  • Publication number: 20110056357
    Abstract: A defect testing apparatus for testing defects of optical film sheet-shaped product of an optical displaying apparatus, which includes a defect detecting means for detecting defects of a monolayer body and/or a laminate body constituting the sheet-shaped product in a state in which a protective layer on a surface of the sheet-shaped product is not disposed and defect information preparing means for preparing defect information which is information related to the defects detected by the defect detecting means, and the defect information is used for producing the sheet-shaped product provided in a roll form or in separate sheets.
    Type: Application
    Filed: November 10, 2010
    Publication date: March 10, 2011
    Applicant: NITTO DENKO CORPORATION
    Inventor: Hiromichi Ohashi
  • Publication number: 20100288441
    Abstract: [Objects] To make it possible to carry out automatically and accurately a laminating operation of an optical element to a sheet-shaped body. [Means for Accomplishing the Objects] A strip-shaped polarizing film has a protective film strip conformably adhered to one surface thereof and a releasable liner conformably adhered to the other surface thereof and delivered from a film delivering station 1. After an appearance inspection, a lamination of the protective film strip and the polarizing film strip F is half-cut using a laser unit 11 to form an array of laminations each consisting of a protective film and a polarizing film F, with the releasable liner being left intact. Then, the polarizing films F are fed to a peeling mechanism 4. The peeling mechanism 4 feeds a forwardmost one the polarizing films F to a laminating mechanism 5 while peeling off the releasable liner therefrom by a knife-edged member.
    Type: Application
    Filed: July 26, 2010
    Publication date: November 18, 2010
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuo KITADA, Yoshihiro KAMEDA, Kanji NISHIDA, Tomokazu YURA, Takaichi AMANO, Hiromichi OHASHI, Atsushi HINO, Naoyuki MATSUO
  • Publication number: 20100165333
    Abstract: A first inspection process of inspecting presence of a defect on a front surface of a film body with a protective film separated therefrom; a separator removing process of separating a separator from the inspected laminated film; a second inspection process of inspecting presence of the defect in the film body in a vertical attitude while introducing the film body with the separator separated and removed therefrom to a film travel path directed in a vertical direction, and storing detection data; a separator laminating process and a protective film laminating process of laminating a separator and a protective film to a back surface and a front surface of the inspected film body, respectively; and a film collecting process of winding up the inspected laminated film laminated with the protective film and the separator are provided.
    Type: Application
    Filed: August 12, 2008
    Publication date: July 1, 2010
    Inventors: Hiromichi Ohashi, Kosuke Sato
  • Publication number: 20100067264
    Abstract: Provided is a power conversion apparatus in which a main circuit is provided with a plurality of switches, and power conversion is performed to generate power for supply to a three-phase AC load from a three- or single-phase AC power supply. At least some of the plurality of switches are configured, using a bidirectional switch including a normally-on device that is turned OFF when a gate circuit is provided with either a positive or negative voltage, and a normally-off device that is turned ON when the gate circuit is provided with either a positive or negative voltage, to provide only a specific unidirectional current flow when the gate circuit is not activated, and when the gate circuit is activated, provide a bidirectional current flow and control the current flow to direct only in an arbitrary unidirectional way.
    Type: Application
    Filed: July 21, 2009
    Publication date: March 18, 2010
    Inventors: Hiromichi OHASHI, Kyungmin Sung, Masamu Kamaga, Mitsuaki Shimizu
  • Publication number: 20090199950
    Abstract: [Objects] To make it possible to carry out automatically and accurately a laminating operation of an optical element to a sheet-shaped body. [Means for Accomplishing the Objects] A strip-shaped polarizing film has a protective film strip conformably adhered to one surface thereof and a releasable liner conformably adhered to the other surface thereof and delivered from a film delivering station 1. After an appearance inspection, a lamination of the protective film strip and the polarizing film strip F is half-cut using a laser unit 11 to form an array of laminations each consisting of a protective film and a polarizing film F, with the releasable liner being left intact. Then, the polarizing films F are fed to a peeling mechanism 4. The peeling mechanism 4 feeds a forwardmost one the polarizing films F to a laminating mechanism 5 while peeling off the releasable liner therefrom by a knife-edged member.
    Type: Application
    Filed: April 13, 2009
    Publication date: August 13, 2009
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazuo KITADA, Yoshihiro KAMEDA, Kanji NISHIDA, Tomokazu YURA, Takaichi AMANO, Hiromichi OHASHI, Atsushi HINO, Naoyuki MATSUO
  • Publication number: 20090195068
    Abstract: To realize power supply to each gate drive circuit without using an individual dedicated power supply for each gate drive circuit. A power conversion apparatus includes an individual drive unit that does not require a dedicated power supply, and includes gate drivers connected to switches and interface circuits and a power converter gate drive configured with a common power supply for supplying power to the gate drive unit. Power is supplied from main circuits or a number of common power supplies fewer than that of the number of the switches through one or more power supply terminals included in the interface circuit. Also, the signal can be transmitted by isolation from a signal source to the gate drivers.
    Type: Application
    Filed: January 23, 2009
    Publication date: August 6, 2009
    Inventors: Hiromichi Ohashi, Yukihiko Sato, Kyungmin Sung, Masamu Kamaga, Moe Imaizumi
  • Patent number: 7531871
    Abstract: A semiconductor element of this invention includes a drift layer of a first conductivity type formed on a semiconductor substrate of the first conductivity type, a well layer of a second conductivity type selectively formed in the surface of the drift layer, a source layer of the first conductivity type selectively formed in the surface of the well layer, a trench formed to reach at least the inside of the drift layer from the surface of the source layer through the well layer, a buried electrode formed in the trench through a first insulating film, and a control electrode formed on the drift layer, the well layer, and the source layer through a second insulating film.
    Type: Grant
    Filed: December 5, 2005
    Date of Patent: May 12, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Ichiro Omura, Wataru Saito, Tsuneo Ogura, Hiromichi Ohashi, Yoshihiko Saito, Kenichi Tokano
  • Publication number: 20080088790
    Abstract: The test data processing apparatus of the present invention is a test data processing apparatus for processing test data obtained by testing defects of a sheet-shaped product having at least an optical film which is a member of an optical displaying apparatus, comprising a defect information preparing section, wherein, on the basis of surface defect test data relating to a surface defect and bright point test data relating to a bright point obtained when the optical film or a laminate body containing the optical film is regarded as an object of testing, in a case that a position of the surface defect and a position of the bright point are identical, the surface defect and the bright point located at the identical position are not regarded as a defect for processing by the defect information preparing section.
    Type: Application
    Filed: October 10, 2007
    Publication date: April 17, 2008
    Applicant: NITTO DENKO CORPORATION
    Inventor: Hiromichi Ohashi
  • Publication number: 20080087149
    Abstract: A defect testing apparatus according to the present invention is a defect testing apparatus for testing defects of a sheet-shaped product having at least an optical film which is a member of an optical displaying apparatus, including: defect detecting means for detecting defects of a monolayer body and/or a laminate body constituting the sheet-shaped product in a state in which a protective layer on a surface of the sheet-shaped product is not disposed; and defect information preparing means for preparing defect information which is information related to the defects detected by said defect detecting means, wherein said defect information is used for producing the sheet-shaped product provided in a roll form or in separate sheets.
    Type: Application
    Filed: October 10, 2007
    Publication date: April 17, 2008
    Applicant: NITTO DENKO CORPORATION
    Inventor: Hiromichi Ohashi