Patents by Inventor Hirofumi Yasumoto

Hirofumi Yasumoto 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).

  • apparatus for electric discharge micromachining of a micro-diameter hole
    Patent number: 6720516
    Abstract: An electrode discharge machining apparatus includes a first holder for holding a workpiece to be subjected to electro discharge machining, an electrode provided opposing the workpiece held by the first holder, a capacitor for supplying electric charge to the electrode and the workpiece so as to generate pulse electro discharge between the workpiece and the electrode, a power source for applying a voltage to the capacitor, a switching element provided between the capacitor, and at least one of the electrode, the workpiece and the power source, a switch controller for controlling on and off of the switching element, a current detecting element for detecting a current flowing between the workpiece and the electrode, and a control unit for, based on the current detected by the current detecting element, judging whether or not a short circuit occurs between the workpiece and the electrode.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: April 13, 2004
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yoshio Yamada, Takeshi Masaki, Toru Nakagawa, Hiroyuki Nakata, Hirofumi Yasumoto, Toshihiko Wada
  • Apparatus for electric discharge micromachining
    Publication number: 20020117478
    Abstract: An electro discharge machining apparatus comprises a first holder for holding a workpiece to be subjected to electro discharge machining, an electrode provided opposing the workpiece held by the first holder, a capacitor for supplying electric charge to the electrode and the workpiece so as to generate pulse electro discharge between the workpiece and the electrode, a power source for applying a voltage to the capacitor, a switching element provided between the capacitor, and at least one of the electrode, the workpiece and the power source, a switch controller for controlling on and off of the switching element, a current detecting element for detecting a current flowing between the workpiece and the electrode, and a control unit for, based on the current detected by the current detecting element, judging whether or not a short circuit occurs between the workpiece and the electrode.
    Type: Application
    Filed: December 12, 2001
    Publication date: August 29, 2002
    Inventors: Yoshio Yamada, Takeshi Masaki, Toru Nakagawa, Hiroyuki Nakata, Hirofumi Yasumoto, Toshihiko Wada