Patents by Inventor Youichi Ohshima

Youichi Ohshima 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).

  • Method for controlling the gain of a tracking servo circuit
    Patent number: 5436877
    Abstract: An optical disk player having a tracking servo loop comprising tracking error signal generating means and tracking driving means for operating a tracking mechanism in an optical head based on a tracking error signal generated. In the tracking servo loop, a servo gain selector is installed to selectively provide a first gain suitable for a recording and/or reproducing operation and a second gain which is higher than the first, thereby keeping the second gain selected only during the period from the beginning to completion of a tracking servo positioning operation.
    Type: Grant
    Filed: September 6, 1994
    Date of Patent: July 25, 1995
    Assignee: Sony Corporation
    Inventor: Youichi Ohshima