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:
Nov. 14, 2006
Filed:
May. 17, 2005
Yoshimasa Fushimi, Neyagawa, JP;
Yoshihiro Masumoto, Kobe, JP;
Mitsuhiro Wada, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The present invention provides a small projection type display apparatus capable of suppressing an optical path of incident light and an optical path of output light in a reflection type light valve from being overlapped with each other and obtaining a projected image of high quality; a rear projector and a multi-vision system using the same. The projection type display apparatus is composed of an illumination optical systemfor collecting light radiated from a light sourceto form illumination light, a reflection type light valvefor reflecting the illumination light to output modulated light forming an optical image, a projection lens systemfor projecting an optical image formed by the reflection type light valve, and a lens elementwith a positive power. The lens elementis composed of one plano-convex lens, and is placed between the reflection type light valve and the projection lens system with a convex surface directed to the projection lens system, in such a manner that the illumination light passes through the lens element to illuminate the reflection type light valve, and the modulated light output from the reflection type light valve passes through the lens element to be incident upon the projection lens system.