Patent ID: 7917026

Claim:
A shutter comprising: a first light-pervious electrode; a second light-pervious electrode; a light-shielding layer sandwiched between the first and second light-pervious electrodes, the light-shielding layer comprised of an electrostrictive material, the light-shielding layer having a fixed end positioned adjacent to one edge of the first light-pervious electrode, and a free end facing toward the opposite edge of the first light-pervious electrode, the free end of the light-shielding layer being capable of extension from a first position, where light passes through the first and the second light pervious electrodes without passing through the light-shielding layer, to a second position, where the light is blocked by the light-shielding layer from passing through the first and the second light-pervious electrodes in response to a voltage applied to the light-shielding layer; and a voltage supplying system electrically connected with the first and second light-pervious electrodes for supplying a voltage between the first and second light-pervious electrodes.