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:
May. 01, 1990
Filed:
Jul. 19, 1988
Akira Ito, Atsugi, JP;
Mizuo Okada, Yokohama, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
Provided is a rear projection screen of a certain configuration having an entrance surface receiving red, blue and green rays from projectors on a projecting side and formed therein entrance lenses and an exit surface allowing images synthesized or merged with the red, blue and green light rays to be observed on a viewing side and formed therein exit lenses corresponding respectively to the incident lenses, each of the entrance lenses are each of the exit lenses having optical axes and lens surfaces around the optical axes, respectively, with theoretical curvatures so that each entrance lens transmits red, blue and green light rays to the corresponding exit lens while the entrance lens converges the light rays into a certain converging area around the cross point between the lens surface of the corresponding exit lens and the optical axis if the configuration of the screen is theoretical, and each associated exit lens emits the converged light rays from the exit surface toward the viewing side over a predetermined viewing angle, wherein the curvature of each exit lens is made to be moderate more than the theoretical curvature of the exit lens, outside of the converging area around the cross point between the lens surface and the optical axis of the exit lens.