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:
Apr. 27, 2004
Filed:
Nov. 22, 2002
Applicant:
Inventors:
Bruce L. Cannon, Portland, OR (US);
Peter R. Oehler, Aloha, OR (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 2/100 ; G03B 2/126 ; G03B 2/114 ; G03B 2/128 ; G03B 2/156 ;
U.S. Cl.
CPC ...
G03B 2/100 ; G03B 2/126 ; G03B 2/114 ; G03B 2/128 ; G03B 2/156 ;
Abstract
A light engine ( ) for a projection display is provided which employs: 1) at least one light source ( ), 2) at least one TIR prism assembly ( ), and 3) at least one digital micromirror device ( ), wherein: (a) the illumination path ( ) between the light source ( ) and the prism assembly ( ) is unfolded, i.e., the illumination path is free of fold mirrors; and (b) the angle &ggr; between the illumination path ( ) and the device's horizontal axis ( ) is preferably less than or equal to about 20°.