Patent ID: 7452143
Filing Date: 2008-11-18
Classification: H02N,H04N

Abstract:
1. A shutter device, which adjusts incident light in amount, comprising: a first fixed member and a second fixed member, each having a plurality of electrodes arranged on a surface; a first light-transmitting region and a second light-transmitting region, which are provided in the first fixed member and the second fixed member, respectively; a first light-shielding member and a second light-shielding member, each having a plurality of electret parts, the first light-shielding member being able to move between two positions where the first light-transmitting region is closed and opened, respectively, and the second light-shielding member being able to move between two positions where the second light-transmitting region is closed and opened, respectively; and a drive circuit which periodically applies a voltage to the electrodes provided on the first and second fixed members, thereby to generate an electrostatic force acting on the electret parts of the first light-shielding member and an electrostatic force acting on the electret parts of the second light-shielding member and to drive the first and second light-shielding members independently.