Patents by Inventor Kiyokazu Shirai

Kiyokazu Shirai 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).

  • Light emitting apparatus comprising multiple groups of LEDs each containing multiple LEDs
    Patent number: 5598068
    Abstract: A plurality of LEDs are divided into multiple groups with the LEDs in each group being connected in series and being driven by a single current source. A region to be illuminated is divided into many areas with no spacing between adjacent ones of the areas. The LEDs in each group are positioned in different areas such that each area includes many LEDs from different groups. If one of the current sources and/or one of the LEDs of one group breaks down, the broken current source and/or LED does not affect the current sources and/or LEDs of the other groups.
    Type: Grant
    Filed: March 10, 1995
    Date of Patent: January 28, 1997
    Assignee: Sony/Tektronix Corporation
    Inventor: Kiyokazu Shirai