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. 14, 2004
Filed:
Jan. 30, 2002
George P. Pinho, Waterloo, CA;
Christie Digital Systems Inc., Ontario, CA;
Abstract
An improvement to video projectors having a reflector/lamp for compressing light to a focal point at a predetermined f/#, an integrating rod positioned at the focal point to collect and integrate the light, and a detector for sensing light output from the integrating rod, the improvement comprising a converging lens positioned between the reflector/lamp and the integrating rod for compressing the focal point so as to increase the amount of light entering the integrating rod while consequentially decreasing said f/#, and a diverging lens for increasing the focal point within the integrating rod so as to restore said predetermined f/#. Preferably, the diverging lens is fabricated from gradient index glass.