US Patent 7917026 Shutter and camera module with same

A shutter includes a first light-pervious electrode, a second light-pervious electrode, a light-shielding layer sandwiched between the first and second light-pervious electrodes and a voltage supplying system. The light-shielding layer is comprised of an electrostrictive material. The light-shielding layer has a fixed end positioned adjacent to one edge of the first light-pervious electrode, and a free end facing toward the opposite edge. The free end is extendable towards the opposite edge of the first light-pervious electrode to block light from in response to a voltage applied to the light-shielding layer. The voltage supplying system is electrically connected with the first and second light-pervious electrodes for supplying a voltage between the first and second light-pervious electrodes.