Patents by Inventor Sususmu Takahashi

Sususmu Takahashi 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 apparatus using 4 separate detection elements with first and second multiplying means
    Patent number: 5282192
    Abstract: An optical disc apparatus for playing an optical disc carrying information in a form of pits laid along a track on the disc, which comprises a light beam for reading the information by forming a beam spot on the disc through an objective lens, a device for displacing the beam spot in a radial direction of the disc, a 4-division optical detector having 4 detecting elements for electro-optically converting a beam of light reflected from the beam spot to electrical signals, a first pair of the 4 detecting elements being arranged correspondingly to one side of the track and a second pair of them being arranged correspondingly to another side of the track, a first multiplier for multiplying respective outputs of the first pair of the 4 detecting elements each other, a second multiplier for multiplying respective outputs of the second pair of the detecting elements each other, and a subtracting device for producing a difference value between respective outputs of the first and second multipliers, and the displacing
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: January 25, 1994
    Assignee: Victor Company of Japan, Ltd.
    Inventors: Kunio Yamada, Sususmu Takahashi