Folding converging light into a lightpipe

Details Folding converging light into a lightpipe Folding converging light into a lightpipe

2007-08-07

2007-08-07

Quach-Lee, Y. My (Department: 2885)

Illumination

With polarizer

C362S551000, C362S583000

Reexamination Certificate

active

10917054

ABSTRACT:
The present invention relates to a folded front end unit used in a light engine of a projection display device. The front end unit comprises a light source for generating a beam of light, and a lightpipe for providing spatial uniformity to the beam of light. Polarization-dependent front end units include polarization beam splitters for separating the light into orthogonally polarized sub-beams, and a polarization rotating element, e.g. a waveplate, for rotating the polarization of one of the sub-beams. In accordance with the present invention, a prism is positioned between the light source and the lightpipe for reflecting the light into the lightpipe. The difference in refractive index between the air and the prism decreases the cone angle of the beam of light enough to effectively increase the distance between the light source and the lightpipe to compensate for the added distance required to fold the light.

REFERENCES:
patent: 3626170 (1971-12-01), Schwan
patent: 3807842 (1974-04-01), Baker
patent: 7033056 (2006-04-01), Andersen et al.
patent: 2006/0044833 (2006-03-01), Li

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