Optical device provided to an eye glass or a helmet having a frontal transmittance and a peripheral transmittance
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United States of America Patent
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Dec 20, 2016
Grant Date -
Dec 3, 2015
app pub date -
Jun 2, 2015
filing date -
Dec 3, 2012
priority date (Note) -
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Abstract
Conventional optical devices cannot cope with light entering from different directions in different light amounts. An optical device comprises: a transmittance changing unit that is provided in front of an eye of a user, and changes transmittance for light from the outside according to a voltage being applied; and a voltage control unit that controls a voltage to be applied to the transmittance changing unit, wherein by controlling the voltage, the voltage control unit switches between: a first relationship between frontal transmittance that is transmittance for light entering the transmittance changing unit from a frontal direction, and peripheral transmittance that is transmittance for light entering the transmittance changing unit from a direction inclined to the vertical direction relative to an entrance direction of light to which the frontal transmittance applies; and a second relationship between the frontal transmittance and the peripheral transmittance that is different from the first relationship.
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