Patent ID: 8022599

Claim:
An actuator comprising: a substrate; a fixed electrode provided on a major surface of the substrate; a first dielectric film provided on the fixed electrode, and made of crystalline material; an anchor portion provided on the substrate; a movable beam opposed to the major surface, and held by the anchor portion above the substrate with a gap to the substrate; a movable electrode provided on a first surface of the movable beam and having an alternate voltage applied between the fixed electrode and the movable electrode, the first surface facing the fixed electrode, the movable electrode having a first portion facing the fixed electrode, a second portion provided on the anchor portion side and a third portion between the first portion and the second portion; and a second dielectric film selectively provided on a second surface of the first portion of the movable electrode and made of crystalline material, the second surface facing the fixed electrode, and at least a part of the third portion being not covered by the second dielectric film; wherein the first dielectric film and the second dielectric film are made of aluminum nitride and a film thickness of the first dielectric film is the same as a film thickness of the second dielectric film.