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:
Aug. 07, 1984
Filed:
Dec. 28, 1981
Ralph J Gagnon, Chico, CA (US);
Hughes Aircraft Company, El Segundo, CA (US);
Abstract
This invention provides a unitary oil coupled optical arrangement for color selective prepolarization of the light incident upon two light valves. The optical arrangement is immersed within a single tank. It includes dichroic filters which act on polarized light from a light source which has been polarized into two beams by passing through and being reflected from a prepolarizing optical thin film stack. The first dichroic filter provides light of a first color and a first polarization while the second dichroic filter provides light of a second color and a second polarization. The light from each of the filters is then combined into a single beam by a thin film polarization-selective beam combiner prior to being applied to the main polarizing prism. The main prism then passes light of a first polarization and a first color to a first light valve and light of the second polarization and a second color to the second light valve in a conventional manner. Each light valve operates on the light in accordance with the presence of the writing light input from a cathode ray tube. The output of each light valve and is then applied to projection lens by the main polarizing prism.