Patents by Inventor Hiroshi Takeya

Hiroshi Takeya 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 setting the loop gain in a focusing servo loop
    Patent number: 5187696
    Abstract: A method for setting the loop gain in a focusing servo loop of a disc player. The loop is opened and the objective lens is moved repeatedly up and down about the focusing point while the disc is slowly rotated, thereby generating an S-shaped focusing error curve. The S-shaped error curve is sampled and a loop gain is determined based on the sampled values. If an eject instruction occurs during the loop gain setting process, a braking pulse is applied to a spindle motor for stopping the disc rotation.
    Type: Grant
    Filed: August 28, 1989
    Date of Patent: February 16, 1993
    Assignee: Pioneer Electronic Corporation
    Inventors: Hidehiro Ishii, Hiroshi Takeya, Chiharu Miura, Tatsuya Fukuda