Patents by Inventor Yasuo Yatsuda

Yasuo Yatsuda 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).

  • Key switch and keyboard
    Patent number: 6618239
    Abstract: A key switch includes a switch provided on a base, a key top for operating the switch, and a link mechanism supported on the base and supporting the key top on its upper side, a shape of the link mechanism being changed when the key top is depressed. A movable plate is provided on the base, in stacked relationship; such that the movable plate is moved when the key top is depressed so as to change the shape of the link mechanism to a flat shape. An auxiliary link mechanism has a first part supported on the moveable plate and, in turn, by the base and a second part supporting the key top.
    Type: Grant
    Filed: February 8, 2002
    Date of Patent: September 9, 2003
    Assignees: Fujitsu Limited, Nagano Fujitsu Component Limited
    Inventors: Kouki Takahashi, Kouji Ishikawa, Kiyokazu Moriizumi, Kiyoshi Wada, Katsumi Harada, Junichi Maruyama, Yasuo Yatsuda, Kazutoshi Hayashi, Toshiaki Tanaka
  • Key switch and keyboard
    Publication number: 20020185364
    Abstract: The present invention relates to a key switch including a switch provided on a base, a key top for operating the switch, a link mechanism supported on the base and supporting the key top on its upper side, a shape of the link mechanism being changed when the key top is depressed, a movable plate provided on the base such that the movable plate is moved when the key top is depressed so as to change the shape of the link mechanism to the flat shape and an auxiliary link mechanism. The auxiliary linking mechanism is provided with a first side part supported by the base and a second side part supporting the key top.
    Type: Application
    Filed: February 8, 2002
    Publication date: December 12, 2002
    Inventors: Kouki Takahashi, Kouji Ishikawa, Kiyokazu Moriizumi, Kiyoshi Wada, Katsumi Harada, Junichi Maruyama, Yasuo Yatsuda, Kazutoshi Hayashi, Toshiaki Tanaka
  • Semiconductor device and method of producing the same
    Patent number: 6191494
    Abstract: A semiconductor device and a method of producing the same are provided. The semiconductor device includes: a semiconductor chip; a resin package which seals the semiconductor chip; signal passages which guide the signal terminals of the semiconductor chip outward from the resin package; a grounding metal film in contact with the bottom surface of the semiconductor chip; and a grounding passage which is connected to the grounding metal film and guided outward from the resin package.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: February 20, 2001
    Assignee: Fujitsu Limited
    Inventors: Nobuo Ooyama, Shinichiro Maki, Fumitoshi Fujisaki, Syunichi Kuramoto, Yukio Saigo, Yasuo Yatsuda, Youichi Matae, Atsushi Yano, Kazuto Tsuji, Masafumi Tetaka
  • Data input device with a manually operable key having static electricity releasing function
    Patent number: 5401926
    Abstract: A data input device, such as a keyboard, comprising at least one key having a static electricity releasing circuit incorporated therein. The key comprises a manually operable keytop for pushing the membrane switch and is made from an electrically conductive plastic. At least one coil spring is provided between the keytop and the support panel or the other conductive layer that is connected to a ground. Thus a static electricity releasing circuit is formed from the keytop to the ground via the coil spring so as to instantaneously and reliably release static electricity that has accumulated on an operator to a ground.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: March 28, 1995
    Assignee: Fujitsu Limited
    Inventors: Michihiro Aoyama, Yasuo Yatsuda