Projection light source

Details Projection light source Projection light source

1997-12-23

2000-11-07

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

359629, G02B 2710, G02B 2714

Patent

active

061444952

ABSTRACT:
A projection light source, and associated method, for generating an arcuate band of light, including an angular integrator, an image dissector, and a relay and remapper. The angular integrator includes a first face, a second face, and a plurality of triangular grooves longitudinally extending along the first face and the second face. The triangular grooves are separated in the transverse direction by gaps, and the triangular grooves on the first face lie in a substantially orthogonal direction to the triangular grooves on the second face. Light passes from the first face to the second face. The image dissector includes an input face, an output face, and plural elements that redirect light from the input face to the output face. The output face has a substantially rectangular shape that is different than that of the input face. At least one of the plural elements has at least one coating that reduces optical transmission efficiency of the element. The relay and remapper include a lens system and a parabolic mirror. The lens system has a highly curved field that distorts the substantially rectangular-shaped band of light into a curved image whose radius of curvature is the same as the arcuate band of light. The parabolic mirror has a latus rectum that is approximately equal to a curvature of the substantially arcuate band of light and has a cross section at the latus rectum.

REFERENCES:
patent: 4939630 (1990-07-01), Kikuchi et al.
patent: 5594587 (1997-01-01), Komatsuda et al.
patent: 5729331 (1998-03-01), Tanaka et al.
patent: 5793473 (1998-08-01), Koyama et al.

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