Intense brightness optical system
AssigneeChristie Digital Systems, Inc.
InventorGeorge P. Pinho
Life of this patent
Estimating the term…
Abstract
An improvement 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.
Claims6
For use in a video projector 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, the improvement comprising a converging lens positioned between said reflector/lamp and said integrating rod for compressing said focal point so as to increase the amount of light entering the integrating rod while consequentially decreasing said f/#, and a mechanism for increasing said focal point within said integrating rod so as to restore said predetermined f/#.
The improvement of any of the foregoing claims, wherein said integrating rod is tapered to increase amount of light restored to said predetermined f/#.
Dependencies are inferred from the claim text.