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:
Nov. 03, 1987
Filed:
Jul. 30, 1986
Applicant:
Inventor:
Richard W Nosker, Princeton, NJ (US);
Assignee:
RCA Corporation, Princeton, NJ (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ;
U.S. Cl.
CPC ...
350345 ; 3503 / ;
Abstract
A light box comprises a source of light, a reflector and a Fresnel lens. The lens provides nearly constant illumination of an object such as a liquid crystal cell by collimating light parallel to a normal to the cell. Thus the cell will exhibit a nearly uniform electro-optical response. The reflector preferably is parabolic, while the light source preferably is a line source such as a fluorescent tube.