Patents by Inventor Shin-ich Yamada

Shin-ich Yamada 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).

  • Track search apparatus
    Patent number: 5146440
    Abstract: A track search apparatus is composed of an actuator such as voice coil motor for moving a light beam to traverse tracks, a position detector for detecting that the light beam has reached a predetermined position in front of a target track, a velocity detector for detecting the velocity of the light beam, and acceleration/deceleration controller such as microcomputer for applying, to the actuator, a driving signal according to the output from the velocity detector when a signal is generated from the position detector.
    Type: Grant
    Filed: August 24, 1989
    Date of Patent: September 8, 1992
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiroyuki Yamaguchi, Mitsuro Moriya, Shin-ich Yamada