Optics: image projectors – Miscellaneous
Patent
1997-03-31
1998-11-03
Dowling, William
Optics: image projectors
Miscellaneous
353 98, 359894, 385146, G03B 2114
Patent
active
058298584
ABSTRACT:
A projector system includes a lamp, a reflector collector optic, relay optics to image the light from the light pipe exit pupil to the image gate, a light pipe and an image forming means such as a film gate or an LCD (Liquid Crystal Display) panel. The light pipe has a round or octagonal entrance pupil, reflecting internal walls, is tapered in shape, and has a rectangular exit pupil which is larger than a center section in cross-section. The light pipe mixes the light, by internal reflection, and produces light which is uniform in color and intensity across the exit pupil.
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"A Uniform Rectangular Illuminating Optical System For Liquid Crystal Light Valve Projectors", Chang et al, Euro Display '96, pp. 257-260.
Gourley Helen
Levis Maurice E.
Dowling William
Gerber Eliot S.
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