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:
Sep. 11, 2001
Filed:
Feb. 15, 1996
Applicant:
Inventors:
Jean-Pierre Huignard, Paris, FR;
Cécile Joubert, Paris, FR;
Jean-Claude Lehureau, Ste Genevieve des Bois, FR;
Brigitte Loiseaux, Villebon S/Yvette, FR;
Assignee:
Thomson-CSF, Paris, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03H 1/00 ; G03H 1/02 ;
U.S. Cl.
CPC ...
G03H 1/00 ; G03H 1/02 ;
Abstract
A holographic projection screen for large screen projection and back projection with a liquid crystal projector. The screen includes at least one layer made of a photosensitive material in which at least one index grating may be recorded by an interference of an optical recording wave with an optical object wave. The thickness of the layer is equal to or greater than n,&Lgr;,/2&pgr;, where n,is the average index of the photosensitive material, &Lgr; is the average spacing of the index grating and &lgr; is the recording wavelength.