Patents by Inventor Aki Terajima

Aki Terajima 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 pickup
    Patent number: 5805557
    Abstract: There is provided an optical pickup which comprises a light source, an objective lens for converging a beam from the light source onto an optical disc, a diffraction grating for passing a beam returning from the optical disc, a photo-detector for receiving returning beams passing through the diffraction grating. The diffraction grating is divided into two areas, each area including alternatively arranged first diffraction grating pattern and second diffraction grating pattern.
    Type: Grant
    Filed: September 11, 1997
    Date of Patent: September 8, 1998
    Assignee: Pioneer Electronic Corporation
    Inventors: Hitoshi Furuhata, Aki Terajima, Shigeru Takaya, Masufumi Asada