Patents by Inventor Kiyomitsu Nishimura

Kiyomitsu Nishimura 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 apparatus having switch for allowing positional adjustment
    Patent number: 4972400
    Abstract: The invention comprises an optical pickup apparatus including a photodetector which detects a laser beam reflected from information tracks of a disk and an amplifier circuit which amplifies the outputs of the photodetector. The photodetector and the amplifier circuit are integrally combined. A preamplifier circuit is also provided for positional adjustments. A switch is included within the amplifier for alternately inhibiting the path of the outputs of the photodetector to the amplifier circuit to allow for positional adjustment with the preamplifier and enabling the path of the outputs of the photodetector to the amplifier circuit for normal operation.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: November 20, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Toru Kuwabara, Kazuo Hirasawa, Kiyomitsu Nishimura
  • Signal-muting circuit for bridge amplifier
    Patent number: 4366441
    Abstract: A signal-muting circuit, applied to a bridge amplifier comprises two amplifying means, performs signal-muting by shorting the input terminals of non-reversible buffer amplifiers forming the final stage of each amplifying means. Non-reversible amplifiers and said non-reversible buffer amplifiers in the amplifying means have the same voltage gain respectively.
    Type: Grant
    Filed: August 7, 1980
    Date of Patent: December 28, 1982
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kiyomitsu Nishimura