Patents by Inventor Yutaka Matuda

Yutaka Matuda 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).

  • Rear-projection type image display apparatus and rear-projection type screen
    Patent number: 5485308
    Abstract: A rear-projection screen for a rear-projection image display apparatus comprises a Fresnel lens sheet, a first lenticular lens sheet, and a second lenticular lens sheet or a Fresnel lens sheet, first and second lenticular lens sheets and a light absorbing sheet. A light entrance surface of the first lenticular lens sheet or a light exit surface thereof, or both of these surfaces are formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. A thickness of the first lenticular lens sheet is selected to be the thinner than thicknesses of the Fresnel lens sheet, the second lenticular lens sheet, and the light absorbing sheet. The entrance surface and the exit surface of the second lenticular lens sheet are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material are not necessarily dispersed in the base sheet of the second lenticular lens sheet.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: January 16, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Takahiko Yoshida, Hiroki Yoshikawa, Masayuki Muranaka, Atsuo Osawa, Yutaka Matuda