Patents by Inventor Sakashi Oyama

Sakashi Oyama 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 switching device including pivot bearing mechanism
    Patent number: 4893891
    Abstract: In an optical switching device, an optical medium such as a prism and a glass plate is rotatively held on a supporting member by a pivot bearing and a pivot shaft, and the optical medium is rotated, for instance, by a magnetic force so that optical paths are mechanically changed-over. For this construction, the area of the frictional contact surfaces between the pivot bearing and the pivot shaft is decreased thereby providing a stable dynamic characteristic which is maintained for a long time.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: January 16, 1990
    Assignee: NEC Corporation
    Inventors: Masayuki Fujita, Sakashi Oyama