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. 17, 2007
Filed:
Mar. 07, 2002
Yoshimasa Fushimi, Neyagawa, JP;
Yoshihiro Masumoto, Kobe, JP;
Mitsuhiro Wada, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A projection type display apparatus is composed of a light source (), an illumination optical system () for forming illumination light, a reflection type light valve () for reflecting the illumination light to form an optical image, a projection optical system () for projecting the optical image, and a lens () with a positive power. An optical axis () of the reflection type light valve, an optical axis () of the projection optical system, and an optical axis () of the lens with a positive power are matched with each other. The illumination optical system () is placed so that the illumination light passes through the lens () with a positive power and is reflected from the reflection type light valve (). An output pupil () of the illumination optical system () and an entrance pupil () of the projection optical system () are placed so as to have a conjugate relationship with respect to the lens () with a positive power.