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. 01, 2002
Filed:
Aug. 24, 2000
Kimiaki Nakazawa, Saitama, JP;
Kenzo Sado, Yuki, JP;
Fuji Photo Optical Co., Ltd., Saitama, JP;
Abstract
A transparent member having refractive power as a result of curved surface thereon is used in one or more light paths of a three-color projection device in order to correct for the lateral color aberration of the projection lens. The transparent member is positioned between one or more optical modulation element(s) and the beam combining prism of a prism optical system, or alternatively, is on or affixed to the beam combining prism surface. When correcting an image that is enlarged by the projection lens, the curved surface of the transparent member should be convex and positioned on the side of the transparent member nearest the display panels. The focal length of a correction lens that optimally corrects the lateral color of the projection lens depends on the maximum image height at the image input display panel, the lateral color aberration generated by the projection lens, and the air conversion length from the image input display panel to the on axis position of the curved surface.