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:
Mar. 27, 2001
Filed:
Jun. 23, 1999
Applicant:
Inventors:
Douglas W. Anderson, Richardson, TX (US);
D. Scott Dewald, Dallas, TX (US);
Assignee:
Texas Instruments Incorporated, Dallas, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 3/00 ; G02B 9/00 ; G02B 1/322 ;
U.S. Cl.
CPC ...
G02B 3/00 ; G02B 9/00 ; G02B 1/322 ;
Abstract
A projection lens (,) having a BFD:EFL, ratio in the range of 0.80:1 to 1.60:1, an air equivalent BFD of at least 4.3 inches, a throw ratio in the range of 3:1 to 6:1, and lateral color correction of one-quarter pixel when used with an SXGA modulator having pixels on 0.17 &mgr;m centers, and operating with its chief rays telecentric at the plane of the modulator. The projection lens comprises an objective lens group (,), a telecentric lens group (,), and an aperture stop (,) between the objective lens group and the telecentric lens group.