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:
Jul. 20, 2004
Filed:
May. 16, 2002
Applicant:
Inventors:
Simon Magarill, Cincinnati, OH (US);
John D. Rudolph, Cincinnati, OH (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 2/114 ; G02B 2/728 ; G02B 1/10 ; G02B 6/26 ;
U.S. Cl.
CPC ...
G03B 2/114 ; G02B 2/728 ; G02B 1/10 ; G02B 6/26 ;
Abstract
A tilted polarization splitter ( ) for use with a projection lens ( ) and a light modulating panel ( ) is provided. The polarization splitter has an ultra thin substrate ( ) whose thickness is chosen so that the depth of focus of the projection lens in imager space is greater than the astigmatism produced by the splitter at its tilted angle. The polarization splitter can be a wire grid polarizer, polarization coating, or birefringence film carried by or formed on the ultra thin, plane parallel plate substrate.