Auto-focusing optical apparatus
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United States of America Patent
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-
Oct 25, 1994
Grant Date -
N/A
app pub date -
Dec 24, 1992
filing date -
Dec 24, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Eyeglasses including lenses that contain liquid crystal nematic materials with variable refractive indexes. A voltage is applied across the materials to change the refractive index in accordance with a measured distance so that the lenses are always automatically focused as the operator looks at objects different distances away. The distances are measured by an infrared ranging system included in the glasses, which system changes the voltage applied to the material in accordance with changes in distance.
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Cited Art Landscape
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