Patents by Inventor Horiguchi Toshio

Horiguchi Toshio 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 data recording apparatus and an optical data recording/reproducing method performing servo control with both a recording light beam and a reproducing light beam
    Patent number: 5339300
    Abstract: An apparatus performs servo control of a recording light beam by using a reproducing light beam. The reproducing light beam, which does not destroy the recording material of an optical card, is emitted from a reproducing LD to the optical card. The position of the reproducing light beam is controlled by a control unit. A light beam which does not destroy the recording material of the optical card is emitted from a recording LD to the optical card. The position of the light beam from the recording LD is detected by a recording PD and the detected error signal is stored in the control unit. The reproducing light beam is emitted again from the reproducing LD to the optical card together with emitting the recording light beam, which can destroy the recording material of the optical card, from the recording LD. The position of the recording light beam is controlled by the control unit based on the reflected light beam of the reproducing light beam from the optical card and on the stored signal in the control unit.
    Type: Grant
    Filed: January 21, 1993
    Date of Patent: August 16, 1994
    Assignee: Olympus Optical Co., Ltd.
    Inventors: Yuichiro Akatsuka, Horiguchi Toshio