Patent ID: 7050217

Claim:
A method for driving a light deflector, wherein the light deflector deflects a beam incident on a light reflection area by displacing a plate shape member having the light reflection area with an electrostatic force, wherein the light deflector includes a substrate, a plurality of control members, a fulcrum member, the plate shape member, and a plurality of electrodes, wherein stoppers are provided at upper parts of the control members and the control members are provided at a plurality of end parts of the substrate, wherein the fulcrum member includes a vertex part and is provided at an upper surface of the substrate, wherein the plate shape member does not have a fixed end, the light reflection area is provided at an upper surface thereof, the plate shape member includes a conductive layer made of a member partially having conductivity, the plate shape member is movably arranged in a space formed by the substrate, the fulcrum member, and the stoppers, and wherein the electrodes are provided on the substrate and substantially face toward the conductive layer of the plate shape member, the method comprising: turning over a direction of an electric field acting on the plate shape member, in an optional period.