Centrifugal illumination system

Optics: image projectors – Unitary plural refracting surfaces

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353102, 353 69, 385901, G03B 2114

Patent

active

058684816

ABSTRACT:
An image display system such as an LCD projection display includes an illumination homogenizer and a centrifugal relay lens system. The illumination homogenizer, such as a reflective tunnel homogenizer or integrator, efficiently provides uniform distribution of light over a region matched to the configuration of an LCD, or other type of image source. The centrifugal relay lens system includes, for example, an S-curve aspheric lens surface that functions to increase the illumination distribution toward the edges and corners of the image source relative to the center. The projection system provides illumination with improved uniformity and efficiency while also providing a shortened optical pathway.

REFERENCES:
patent: 5628553 (1997-05-01), Booth et al.
patent: 5634704 (1997-06-01), Shikama et al.
patent: 5645334 (1997-07-01), Tejima et al.
patent: 5662400 (1997-09-01), Shikama et al.

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