Patents by Inventor Nobuo Ogata

Nobuo Ogata 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).

  • Pick-up device for use in an optical information recording system utilizing a diffraction grating with blaze characteristics
    Patent number: 5050155
    Abstract: A pick-up device which includes a light source and a condenser lens for effecting recording and reproduction of information by projecting a light beam as collected by the condenser lens onto a recording medium. A diffraction grating is provided between the light source and the condenser lens for dividing light returning from the recording medium by a diffraction grating so as to be directed to a photo-detector, to thereby obtain an optical detection signal.
    Type: Grant
    Filed: March 30, 1989
    Date of Patent: September 17, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yukio Kurata, Hideaki Sato, Yasuo Nakata, Nobuo Ogata
  • Optical information recording and reproducing apparatus
    Patent number: 4985880
    Abstract: An improved optical information recording and reproducing apparatus which is capable of detecting recording errors simultaneously with recording function for reduction of recording time, without requiring particular high accuracy for an optical system, and avoiding complication in the construction and consequent large size of the optical system.
    Type: Grant
    Filed: September 21, 1988
    Date of Patent: January 15, 1991
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshio Yoshida, Nobuo Ogata, Mitsuo Ishii, Yukio Kurata, Yasuo Nakata, Takayuki Inoue, Kazuko Inoue
  • Pick-up device for use in an optical information recording system
    Patent number: 4849825
    Abstract: A pick-up device which includes a light source and a condenser lens for effecting recording and reproduction of information by projecting a light beam as collected by the condenser lens onto a recording medium. A diffraction grating is provided between the light source and the condenser lens for dividing light returning from the recording medium by a diffraction grating so as to be directed to a photo-detector, to thereby obtain an optical detection signal.
    Type: Grant
    Filed: November 10, 1986
    Date of Patent: July 18, 1989
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yukio Kurata, Hideaki Sato, Yasuo Nakata, Nobuo Ogata, Teruaki Inoue
  • Focusing error detector and optical data detecting device incorporating the focusing error detector
    Patent number: 4812638
    Abstract: A focusing error detector comprises a light source, a collimator lens for making parallel the pencil of rays emitted by the light source, an objective lens which focuses the parallel pencil of rays to form a beam spot on a data-recording disc with data tracks and guide tracks formed thereon and which receives the pencil of rays reflected from the data-recording disc, an optical system for forming a beam spot from the reflected pencil of rays incident to the objective lens, and an optical detector having a plurality of divided optical sensor blocks for receiving the formed beam spot so as to detect the focusing error of the beam spot formed on the data-recording disc on the basis of the configuration of the received beam spot.
    Type: Grant
    Filed: July 28, 1987
    Date of Patent: March 14, 1989
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nobuo Ogata, Yasuo Nakata, Hideaki Satou, Toshiyuki Tanaka, Etsuji Minami, Yoshio Yoshida, Yukio Kurata, Teruaki Inoue, deceased