Patents by Inventor Kazuyuki Hishida

Kazuyuki Hishida 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).

  • Multiple beam optical disk apparatus with multiple clock extracting circuits used for monitoring and cross fading
    Patent number: 5239529
    Abstract: A disk recording and reproducing apparatus using two light beams has a disk driving section for loading a disk-shaped record medium having recording tracks and for rotating the disk-shaped record medium, an optical system having a light beam generating source, a light beam splitting device for splitting a light beam to provide at least a main beam and a sub beam, an optical path forming device for respectively causing the main beam and the sub beam to become incident on two adjacent recording tracks in the disk-shaped record medium loaded on the disk driving section and a photo-detecting device for detecting the condition that at least the sub beam from the disk-shaped record medium loaded on the disk driving section is affected by the recording track.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: August 24, 1993
    Assignee: Sony Corporation
    Inventors: Satoru Tobita, Teruaki Higashihara, Kazuyuki Hishida, Masaru Tezuka