Patents by Inventor Shingeaki Wachi

Shingeaki Wachi 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).

  • Optical disc recording/reproduction apparatus with improved track seeking
    Patent number: 5157642
    Abstract: A recording and/or reproduction apparatus of an optical disc having recording tracks in which mirror areas are formed incorporates an optical head for recording or reproducing information signal onto or from the optical disc which has an optical detector for detecting a tracking error signal by a push-pull method; a fine actuator for precisely actuating the optical head finely; detecting means for detecting an output signal of the optical detector responding to reflected light from the mirror area; and driving means for driving the fine actuator in response to an output signal of the detecting means during the seeking operation.
    Type: Grant
    Filed: December 15, 1989
    Date of Patent: October 20, 1992
    Assignee: Sony Corporation
    Inventors: Yoshihiro Tsukamura, Naoya Eguchi, Kimihiro Saitou, Shingeaki Wachi