Patents by Inventor Tokiyoshi Matsuda

Tokiyoshi Matsuda 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: 7993964
    Abstract: A manufacturing method of a semiconductor device includes forming an oxide semiconductor thin film layer of zinc oxide, wherein at least a portion of the oxide semiconductor thin film layer in an as-deposited state includes lattice planes having a preferred orientation along a direction perpendicular to the substrate and a lattice spacing d002 of at least 2.619 ?.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: August 9, 2011
    Assignees: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Takashi Hirao, Takahiro Hiramatsu, Mamoru Furuta, Hiroshi Furuta, Tokiyoshi Matsuda
  • Patent number: 7981734
    Abstract: A manufacturing method of a thin film transistor includes forming a pair of source/drain electrodes on a substrate, such that the source/drain electrodes define a gap therebetween; forming low resistance conductive thin films, which define a gap therebetween, on the source/drain electrodes; and forming an oxide semiconductor thin film layer on upper surface of the low resistance conductive thin films and in the gap defined between the low resistance conductive thin films so that the oxide semiconductor thin film layer functions as a channel. The low resistance conductive thin films and the oxide semiconductor thin film layer are etched so that side surfaces of the resistance conductive thin films and corresponding side surfaces of the oxide semiconductor thin film layer coincide with each other in a channel width direction of the channel. A gate electrode is mounted over the oxide semiconductor thin film layer.
    Type: Grant
    Filed: July 8, 2009
    Date of Patent: July 19, 2011
    Assignees: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Mamoru Furuta, Takashi Hirao, Hiroshi Furuta, Tokiyoshi Matsuda, Takahiro Hiramatsu, Hiromitsu Ishii, Hitoshi Hokari, Motohiko Yoshida
  • Patent number: 7977169
    Abstract: A semiconductor device includes an oxide semiconductor thin film layer primarily including zinc oxide having at least one orientation other than (002) orientation. The zinc oxide may have a mixed orientation including (002) orientation and (101) orientation. Alternatively, the zinc oxide may have a mixed orientation including (100) orientation and (101) orientation.
    Type: Grant
    Filed: February 9, 2007
    Date of Patent: July 12, 2011
    Assignees: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Takashi Hirao, Mamoru Furuta, Hiroshi Furuta, Tokiyoshi Matsuda, Takahiro Hiramatsu
  • Publication number: 20090286351
    Abstract: A manufacturing method of a semiconductor device includes forming an oxide semiconductor thin film layer of zinc oxide, wherein at least a portion of the oxide semiconductor thin film layer in an as-deposited state includes lattice planes having a preferred orientation along a direction perpendicular to the substrate and a lattice spacing d002 of at least 2.619 ?.
    Type: Application
    Filed: July 27, 2009
    Publication date: November 19, 2009
    Applicants: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Takashi HIRAO, Takahiro HIRAMATSU, Mamoru FURUTA, Hiroshi FURUTA, Tokiyoshi MATSUDA
  • Publication number: 20090269881
    Abstract: A manufacturing method of a thin film transistor includes forming a pair of source/drain electrodes on a substrate, such that the source/drain electrodes define a gap therebetween; forming low resistance conductive thin films, which define a gap therebetween, on the source/drain electrodes; and forming an oxide semiconductor thin film layer on upper surface of the low resistance conductive thin films and in the gap defined between the low resistance conductive thin films so that the oxide semiconductor thin film layer functions as a channel. The low resistance conductive thin films and the oxide semiconductor thin film layer are etched so that side surfaces of the resistance conductive thin films and corresponding side surfaces of the oxide semiconductor thin film layer coincide with each other in a channel width direction of the channel. A gate electrode is mounted over the oxide semiconductor thin film layer.
    Type: Application
    Filed: July 8, 2009
    Publication date: October 29, 2009
    Applicants: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Mamoru FURUTA, Takashi Hirao, Hiroshi Furuta, Tokiyoshi Matsuda, Takahiro Hiramatsu, Hiromitsu Ishii, Hitoshi Hokari, Motohiko Yoshida
  • Patent number: 7598520
    Abstract: A semiconductor device includes an oxide semiconductor thin film layer of zinc oxide. The (002) lattice planes of at least a part of the oxide semiconductor thin film layer have a preferred orientation along a direction perpendicular to a substrate of the semiconductor device and a lattice spacing d002 of at least 2.619 ?.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: October 6, 2009
    Assignees: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Takashi Hirao, Takahiro Hiramatsu, Mamoru Furuta, Hiroshi Furuta, Tokiyoshi Matsuda
  • Patent number: 7576394
    Abstract: A thin film transistor includes a substrate, and a pair of source/drain electrodes (i.e., a source electrode and a drain electrode) formed on the substrate and defining a gap therebetween. A pair of low resistance conductive thin films are provided such that each coats at least a part of one of the source/drain electrodes. The low resistance conductive thin films define a gap therebetween. An oxide semiconductor thin film layer is continuously formed on upper surfaces of the pair of low resistance conductive thin films and extends along the gap defined between the low resistance conductive thin films so as to function as a channel. Side surfaces of the oxide semiconductor thin film layer and corresponding side surfaces of the low resistance conductive thin films coincide with each other in a channel width direction of the channel.
    Type: Grant
    Filed: February 1, 2007
    Date of Patent: August 18, 2009
    Assignees: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Mamoru Furuta, Takashi Hirao, Hiroshi Furuta, Tokiyoshi Matsuda, Takahiro Hiramatsu, Hiromitsu Ishii, Hitoshi Hokari, Motohiko Yoshida
  • Publication number: 20070278490
    Abstract: A semiconductor device includes an oxide semiconductor thin film layer of zinc oxide. The (002) lattice planes of at least a part of the oxide semiconductor thin film layer have a preferred orientation along a direction perpendicular to a substrate of the semiconductor device and a lattice spacing d002 of at least 2.619 ?.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 6, 2007
    Applicants: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Takashi Hirao, Takahiro Hiramatsu, Mamoru Furuta, Hiroshi Furuta, Tokiyoshi Matsuda
  • Publication number: 20070187760
    Abstract: A thin film transistor includes a substrate, and a pair of source/drain electrodes (i.e., a source electrode and a drain electrode) formed on the substrate and defining a gap therebetween. A pair of low resistance conductive thin films are provided such that each coats at least a part of one of the source/drain electrodes. The low resistance conductive thin films define a gap therebetween. An oxide semiconductor thin film layer is continuously formed on upper surfaces of the pair of low resistance conductive thin films and extends along the gap defined between the low resistance conductive thin films so as to function as a channel. Side surfaces of the oxide semiconductor thin film layer and corresponding side surfaces of the low resistance conductive thin films coincide with each other in a channel width direction of the channel.
    Type: Application
    Filed: February 1, 2007
    Publication date: August 16, 2007
    Applicants: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Mamoru Furuta, Takashi Hirao, Hiroshi Furuta, Tokiyoshi Matsuda, Takahiro Hiramatsu, Hiromitsu Ishii, Hitoshi Hokari, Motohiko Yoshida
  • Publication number: 20070187678
    Abstract: A semiconductor device includes an oxide semiconductor thin film layer primarily including zinc oxide having at least one orientation other than (002) orientation. The zinc oxide may have a mixed orientation including (002) orientation and (101) orientation. Alternatively, the zinc oxide may have a mixed orientation including (100) orientation and (101) orientation.
    Type: Application
    Filed: February 9, 2007
    Publication date: August 16, 2007
    Applicants: Kochi Industrial Promotion Center, Casio Computer Co., Ltd.
    Inventors: Takashi Hirao, Mamoru Furuta, Hiroshi Furuta, Tokiyoshi Matsuda, Takahiro Hiramatsu