Patents by Inventor Shuichi Onayama

Shuichi Onayama 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 pickup and hologram therefor
    Patent number: 5016954
    Abstract: An optical pickup for picking up signals from an optical disk comprises a hologram to split a laser beam emitted from a laser light source into one 0th diffraction light beam and two 1st diffraction light beams, and also to diffract return light beams reflected from the optical disk with two grating areas formed on one surface thereof. The diffracted light beams from the hologram are detected by a 6-piece-divided photodetector. The number of parts included in the system has been greatly reduced.
    Type: Grant
    Filed: January 2, 1990
    Date of Patent: May 21, 1991
    Assignee: NEC Home Electronics Ltd.
    Inventors: Shuichi Onayama, Kazuhiko Nosaka
  • Optical pickup and hologram therefor
    Patent number: 4907847
    Abstract: An optical pickup for picking up signals from an optical disk comprises a hologram to split a laser beam emitted from a laser light source into one 0th order diffraction light beam and two 1st order diffraction light beams, and also to diffract return light beams reflected from the optical disk with two grating areas formed on one surface thereof. The diffracted light beams from the hologram are detected by a 6-piece-divided photodetector. The number of parts included in the system has been greatly reduced.
    Type: Grant
    Filed: August 2, 1988
    Date of Patent: March 13, 1990
    Assignee: NEC Home Electronics Ltd.
    Inventors: Shuichi Onayama, Kazuhiko Nosaka