Patent ID: 7054132
Filing Date: 2006-05-30
Classification: H01G,H01H,H01P

Abstract:
1. A variable capacitance element comprising: a substrate; a fixed electrode provided on the substrate; a plate-like movable element provided on the substrate at a position opposing the fixed electrode so as to be displaced close to and away from the fixed electrode; a movable electrode provided in a region of the movable element which faces the fixed electrode, the movable electrode having a capacitance in conjunction with the fixed electrode which is changed when the movable electrode is moved close to or away from the fixed electrode; and a driver arranged to drive the movable element in a direction in which the movable element is moved close to or away from the fixed electrode; wherein the movable element is provided with a warp adjusting film by which a direction in which a central portion of the movable element warps with respect to peripheral portions thereof is maintained in one of a direction of warping in a convex form toward the fixed electrode and a direction of warping in a concave form away from the fixed electrode.