Patents by Inventor Yosikazu Fujii

Yosikazu Fujii 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 focus position control in an optical memory system
    Patent number: 4658390
    Abstract: An optical focus position control system in an opto-magnetic disc apparatus includes a tracking control device and a focus control device. The tracking control device includes an intermediate holder, a tracking parallel spring which connects an cylindrical objective lens support to the intermediate holder while ensuring movement of the cylindrical objective lens support in the radial direction of the opto-magnetic disc, and a tracking drive mechanism to shift the cylindrical objective lens support in the radial direction within the intermediate holder. The focus control device includes a stationary holder, a focusing parallel spring which connects the intermediate holder to the stationary holder while ensuring movement of the intermediate holder in the direction of the optical axis of laser beams emitted through the optical focus position control system, and a focusing drive mechanism to shift the intermediate holder in the optical axis direction within the stationary holder.
    Type: Grant
    Filed: April 16, 1984
    Date of Patent: April 14, 1987
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yosikazu Fujii, Tetsuya Inui, Toshihisa Deguchi, Hideyoshi Yamaoka