Patents by Inventor Nobuyuki Kataigi

Nobuyuki Kataigi 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).

  • Pickup for optical disc
    Patent number: 4733943
    Abstract: A pickup system for an optical disc reading/recording apparatus in which a micro Fresnel lens, formed with concentric circular gratings, is used in place of an optical element, such as an objective lens, for focussing and collimating light beams from a semiconductor light source. The pickup system so formed is light in weight, easily miniaturized, and inexpensive to manufacture. The micro Fresnel lens can be formed as an integral unit with the semiconductor laser by mounting the lens in a window of the case of the semiconductor laser.
    Type: Grant
    Filed: November 17, 1983
    Date of Patent: March 29, 1988
    Assignee: Pioneer Electronic Corporation
    Inventors: Shinichi Suzuki, Takashi Suemitsu, Nobuyuki Kataigi