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:
Sep. 11, 2007
Filed:
Feb. 28, 2005
Hidemasa Yamakawa, Matsumoto, JP;
Akitaka Yajima, Tatsuno-machi, JP;
Hidemasa Yamakawa, Matsumoto, JP;
Akitaka Yajima, Tatsuno-machi, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
Exemplary embodiments of the invention provide a projector that can readily correct for chromatic aberration caused by, for example, a projecting lens without having to give a cross dichroic prism, for example, a special preliminary process. Illumination-light components modulated by corresponding liquid-crystal light valves are synthesized in a cross dichroic prism () to form image light. The image light enters a projecting lens () from which the image light is projected onto a screen, which is not shown in the drawings. In the cross dichroic prism () used to synthesize light components, a first prism element (P) has a refractive index higher than that of remaining prism elements (PPand P). This allows a width of a red projection-image component to be made larger than widths of projection-image components of remaining colors, whereby the chromatic aberration in the projecting lens can be readily corrected.