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:
Oct. 05, 2010
Filed:
Sep. 08, 2006
Takahiro Totani, Daito, JP;
Takahiro Totani, Daito, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A liquid crystal projector device of the present invention includes, on an optical axis of a lamp unit, first and second integrator lenses having a plurality of cells arranged in the form of a matrix, a polarization beam splitter, and a slit plate having a plurality of slit apertures that allow light incidence on the polarization beam splitter. A concave lens for collimating light emitted from the lamp unit is arranged on a front of the lamp unit. The concave lens has a light incidence surface thereof formed with a concavity. The concavity is formed such that the slit apertures of the slit plate allow passage of a larger amount of light than that in the case of using a concave lens without any concavity formed thereon.