| 主权项 |
1. An optical device provided to an eye glass or a helmet, the optical device comprising:
a transmittance changing unit that is provided in front of an eye of a user when the eye glass or the helmet is worn by the 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 in which a ratio or a difference 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 certain direction inclined to the vertical direction relative to an entrance direction of light to which the frontal transmittance applies becomes a certain value, anda second relationship that is different from the first relationship and in which a ratio or a difference between the frontal transmittance and the peripheral transmittance becomes a certain value, the transmittance changing unit has:
an entrance-side polarizing plate;a polarization modulation unit that is provided on a user side of the entrance-side polarizing plate, and modulates, by means of the voltage to be applied by the voltage control unit, a polarization state of polarized light to be output; andan exit-side polarizing plate that is provided on a user side of the polarization modulation unit, and the polarization modulation unit includes:
a pair of transparent electrodes that are provided to face each other; anda liquid crystal member that is provided between the pair of transparent electrodes, at least one of the pair of transparent electrodes includes a plurality of divided electrodes that are divided, along the vertical direction, and the voltage control unit controls voltages of the plurality of divided electrodes separately. |
