Patent ID: 7081982

Claim:
A movable mirror device comprising: a substrate; a deformable mirror supported at a central part thereof on the substrate; and a drive section for deforming the mirror into a concave shape and into a convex shape, wherein: the drive section comprises a movable electrode terminal, another movable electrode terminal, a first stationary electrode terminal, and two second stationary electrode terminals each of which has an interdigital structure; the two movable electrode terminals are coupled to two side portions of the mirror; the first stationary electrode terminal is disposed between the movable electrode terminals, and is arranged to face the movable electrode terminals; the two second stationary electrode terminals faces the first stationary electrode terminal with each movable electrode terminal in between; the first stationary electrode terminal and the two stationary electrode terminals are fixed to the substrate; an electrostatic force is generated between the two movable electrode terminals and the first stationary electrode terminal to move the movable electrode terminals, thereby deforming the mirror in convex shape; and an electrostatic force is generated between the two movable electrode terminals and the two secondary stationary electrode terminals to move the movable electrode terminals, thereby deforming the mirror in concave shape.