Patents by Inventor Hisayuki ASHIZAWA

Hisayuki ASHIZAWA 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: 10840827
    Abstract: A vibration energy harvester includes: a first electrode; and a second electrode that can be displaced relative to the first electrode along a predetermined vibrating direction. At least either of a surface of the first electrode and a surface of the second electrode facing opposite each other is electrically charged. Power is generated as the second electrode becomes displaced causing a change in electrostatic capacitance between the first electrode and the second electrode. A range having included therein at least a vibrational center of the second electrode, over which the electrostatic capacitance remains unchanged even as the second electrode is displaced, is set.
    Type: Grant
    Filed: September 27, 2016
    Date of Patent: November 17, 2020
    Assignees: The University of Tokyo, Saginomiya Seisakusho, Inc.
    Inventors: Hiroshi Toshiyoshi, Hiroyuki Fujita, Hisayuki Ashizawa, Hiroyuki Mitsuya, Kazunori Ishibashi
  • Patent number: 10833607
    Abstract: An electret element includes: an Si layer, an SiO2 layer formed at a surface of the Si layer; and an electret formed at the SiO2 layer near an interface of the SiO2 layer and the Si layer.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: November 10, 2020
    Assignees: The University of Tokyo, Saginomiya Seisakusho, Inc.
    Inventors: Hiroyuki Fujita, Gen Hashiguchi, Hisayuki Ashizawa, Hiroyuki Mitsuya, Kazunori Ishibashi
  • Patent number: 10340818
    Abstract: An actuator includes: an electrostatic actuation mechanism including a stationary electrode and a movable electrode; a first movable part driven by the electrostatic actuation mechanism; a first elastic support part that elastically supports the first movable part; an electret formed in at least one of the stationary electrode and the movable electrode; and a drive control unit that controls application of voltage to the electrostatic actuation mechanism. In the actuator a plurality of stable states are set in which the first movable part is positioned at a stable position at which an electrostatic force generated by the electret matches with an elastic force exerted by the first elastic support part or at a stable position near such stable position. By applying a voltage to the electrostatic actuation mechanism, the first movable part may be displaced from any stable position to another stable position.
    Type: Grant
    Filed: July 30, 2014
    Date of Patent: July 2, 2019
    Assignees: National University Corporation Shizuoka University, OMRON Corporation, KABUSHIKI KAISHA SAGINOMIYA SEISAKUSHO
    Inventors: Masato Suzuki, Akito Mori, Gen Hashiguchi, Tatsuhiko Sugiyama, Hiroshi Imamoto, Masatoshi Oba, Hiroyuki Mitsuya, Hisayuki Ashizawa, Kazunori Ishibashi
  • Publication number: 20190058420
    Abstract: A vibration energy harvester includes: a first electrode; and a second electrode that can be displaced relative to the first electrode along a predetermined vibrating direction. At least either of a surface of the first electrode and a surface of the second electrode facing opposite each other is electrically charged. Power is generated as the second electrode becomes displaced causing a change in electrostatic capacitance between the first electrode and the second electrode. A range having included therein at least a vibrational center of the second electrode, over which the electrostatic capacitance remains unchanged even as the second electrode is displaced, is set.
    Type: Application
    Filed: September 27, 2016
    Publication date: February 21, 2019
    Inventors: Hiroshi TOSHIYOSHI, Hiroyuki FUJITA, Hisayuki ASHIZAWA, Hiroyuki MITSUYA, Kazunori ISHIBASHI
  • Patent number: 9915576
    Abstract: A pressure sensor includes: a fixed part; a ring-like oscillator that is supported on the fixed part by a plurality of support beams; a plurality of electrodes that are provided on the fixed part and arranged in an oscillating direction of the ring-like oscillator with a gap; electret films that are formed on either one of opposite surfaces of the ring-like oscillator and the electrodes.
    Type: Grant
    Filed: September 29, 2014
    Date of Patent: March 13, 2018
    Assignees: The University of Tokyo, Kabushiki Kaisha Saginomiya Seisakusho
    Inventors: Hiroyuki Fujita, Gen Hashiguchi, Hiroyuki Mitsuya, Hisayuki Ashizawa
  • Publication number: 20180041140
    Abstract: An electret element includes: an Si layer, an SiO2 layer formed at a surface of the Si layer; and an electret formed at the SiO2 layer near an interface of the SiO2 layer and the Si layer.
    Type: Application
    Filed: February 9, 2016
    Publication date: February 8, 2018
    Inventors: Hiroyuki FUJITA, Gen HASHIGUCHI, Hisayuki ASHIZAWA, Hiroyuki MITSUYA, Kazunori ISHIBASHI
  • Publication number: 20160282209
    Abstract: A pressure sensor includes: a fixed part; a ring-like oscillator that is supported on the fixed part by a plurality of support beams; a plurality of electrodes that are provided on the fixed part and arranged in an oscillating direction of the ring-like oscillator with a gap; electret films that are formed on either one of opposite surfaces of the ring-like oscillator and the electrodes.
    Type: Application
    Filed: September 29, 2014
    Publication date: September 29, 2016
    Applicants: THE UNIVERSITY OF TOKYO, KABUSHIKI KAISKA SAGINOMIYA SEISAKUSHO
    Inventors: Hiroyuki FUJITA, Gen HASHIGUCHI, Hiroyuki MITSUYA, Hisayuki ASHIZAWA
  • Publication number: 20160204716
    Abstract: An actuator includes: an electrostatic actuation mechanism including a stationary electrode and a movable electrode; a first movable part driven by the electrostatic actuation mechanism; a first elastic support part that elastically supports the first movable part; an electret formed in at least one of the stationary electrode and the movable electrode; and a drive control unit that controls application of voltage to the electrostatic actuation mechanism. In the actuator a plurality of stable states are set in which the first movable part is positioned at a stable position at which an electrostatic force generated by the electret matches with an elastic force exerted by the first elastic support part or at a stable position near such stable position. By applying a voltage to the electrostatic actuation mechanism, the first movable part may be displaced from any stable position to another stable position.
    Type: Application
    Filed: July 30, 2014
    Publication date: July 14, 2016
    Inventors: Masato SUZUKI, Akito MORI, Gen HASHIGUCHI, Tatsuhiko SUGIYAMA, Hiroshi IMAMOTO, Masatoshi OBA, Hiroyuki MITSUYA, Hisayuki ASHIZAWA, Kazunori ISHIBASHI