Patent ID: 8258673

Claim:
A semiconductor device comprising: a semiconductor substrate, in which a recessed portion is formed on an upper surface, and a semiconductor layer is exposed to a bottom surface of the recessed portion; an oscillator that includes a beam-type movable electrode arranged in the recessed portion so as to be opposed to a surface of the semiconductor layer, the movable electrode having insulating films arranged on side surfaces and lower surface thereof, and is fixed to the semiconductor substrate at a position apart from the movable electrode; and a beam-type fixed electrode that is arranged in the recessed portion so as to be opposed to the movable electrode and the surface of the semiconductor layer, and is fixed to the semiconductor substrate so as to be electrically isolated from the movable electrode, wherein a connection portion between the oscillator and the semiconductor substrate has a spring shape having flexibility, and the spring-shaped connection portion supports only one side of the beam-type movable electrode.