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. 10, 1994
Filed:
Dec. 23, 1991
Applicant:
Inventors:
Jean M Guerin, Glendale, CA (US);
Abd-El-Fattah A Ibrahim, Palos Verdes Estates, CA (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M / ;
U.S. Cl.
CPC ...
346108 ;
Abstract
A variable attenuator for electronically controlling dual beam intensity comprising a laser source for emitting a light beam, a twisted nematic liquid crystal for exposure control of the light beam, a double-sided multi-layer dielectric thin film coated polarization plate for decreasing the s-component of the light beam to less than or equal to 0.0001 of the light beam emitted from the laser source, and a beam splitting crystal for separating said light beam into two beams of equal intensity.