Patents by Inventor Tsutomu Sumioka

Tsutomu Sumioka 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).

  • Patent number: 4797711
    Abstract: An image scanning apparatus comprises a linear light source being arranged in parallel with a picture plane to be scanned. The linear light source is composed of a cylindrical rod made of a transparent material on which light diffusing reflecting layer of stripe-shaped is provided along a longitudinal axis of the cylindrical, rod and a lighting means for entering light fluxes into the inside of the rod at least from one end thereof to emit light fluxes each having directivity from the outer surface of the rod.
    Type: Grant
    Filed: September 9, 1987
    Date of Patent: January 10, 1989
    Assignee: Dainippon Screen Mfg., Co., Ltd.
    Inventors: Shigeru Sasada, Masahiro Yamamoto, Yoshio Shimizu, Tsutomu Sumioka