Patent ID: 7059190

Claim:
A semiconductor dynamic sensor formed on a laminated substrate composed of a base substrate, an insulation layer and a thin semiconductor layer, laminated in this order, the semiconductor dynamic sensor comprising: a first capacitor including a first beam structure formed on the thin semiconductor layer, the first beam structure having first beams and a first movable electrode supported by the first beams and facing the base substrate with an air gap therebetween, so that the first movable electrode moves in a direction perpendicular to a surface of the thin semiconductor layer when a dynamic force is imposed on the first movable electrode while a first carrier voltage is being applied thereto, a first capacitance being formed between the first movable electrode and the base substrate; and a second capacitor including a second beam structure formed on the thin semiconductor layer, the second beam structure having second beams and a second movable electrode supported by the second beams and facing the base substrate with an air gap therebetween, so that the second movable electrode moves in a direction perpendicular to the surface of the thin semiconductor layer when a dynamic force is imposed on the second movable electrode while a second carrier voltage is being applied thereto, a second capacitance being formed between the second movable electrode and the base substrate, wherein: the first capacitance varies according to the dynamic force applied to the first movable electrode, and the second capacitance varies, in a manner different from the first capacitance, according to the dynamic force applied to the second movable electrode; and an output signal representing a capacitance difference between the first capacitance and the second capacitance is taken out from the base substrate.