Optical collimating device employing cholesteric liquid crystal and a non-transmissive reflector
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United States of America Patent
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Apr 18, 1995
Grant Date -
N/A
app pub date -
Oct 20, 1993
filing date -
Oct 20, 1993
priority date (Note) -
Expired
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Abstract
An optical collimating device employs an optical (concave) mirror and cholesteric liquid crystal element to collimate and project image light into the line-of-sight of an observer in efficient manner. Image light is generated with light components within a predetermined bandwidth and with a predetermined rotary sense. The image light is directed so that it is reflected by the concave mirror, expanding (collimating) the image light, projecting in onto a cholesteric liquid crystal element that reflects those components of the image light within the bandwidth B and having the proper rotary sense of circular polarization. The cholesteric liquid crystal element substantially reflects the returned image to the observer.
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