Adjustable transparency spectacles
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United States of America Patent
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-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Sep 14, 1988
filing date -
Mar 24, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Eyewear has variable transparency provided by a lens made of a non-diffusing dichroic liquid crystal cell with nematic-cholesteric phase change. A voltage source supplies an adjustable voltage to the liquid crystal cell; adjustment of the voltage to change the transparency of the lens is effected by a photocell which senses ambient light, or by manual control, or both.
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