The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2000
Filed:
Jul. 17, 1998
Hiroki Nakamura, Ageo, JP;
Yoshihiro Watanabe, Gyouda, JP;
Hidenori Aizawa, Natori, JP;
Atsushi Sekine, Kasukabe, JP;
Kabushiki Kaisha Toshiba, Kanagawa-ken, JP;
Nikon Corporation, Tokyo, JP;
Sendai Nikon Corporation, Miyagi-ken, JP;
Abstract
Disclosed is a single plate projection type display apparatus which is capable of achieving a high luminance without an increase in an output of a light source. A first lens plate having a plurality of lenses divides a light from a light source into a plurality of light beams. A second lens plate having a plurality of lenses superposes the divided plurality of light beams on a light valve, thereby performing an illumination. A color separation optical system composed of dichroic mirrors which are perpendicular to an XY plane and form predetermined angles to each other, performs a color separation for the light beams from the second lens plate. The light valve modulates R, G and B light beams which are incident thereonto. The modulated lights are projected by a projection lens. The whole shape of the second lens plate is a rectangle. The second lens plate is disposed so that a longitudinal direction of the longer side of the whole shape of the rectangle is perpendicular to a plane formed by a normal line to the dichroic mirrors and an optical axis immediately before an incidence onto the dichroic mirrors.