Patent ID: 7481113

Claim:
A semiconductor sensor comprising: a proof-mass; a frame disposed around the proof-mass and including at least a silicon layer; a beam for supporting the proof-mass, the beam being disposed at a first surface side, at a first surface, of the frame between the proof-mass and the frame; a piezoresistor disposed on the beam; a metal wiring pattern formed at least on the first surface of the frame and electrically connected to the piezoresistor; a cover plate disposed above and spaced apart from the proof-mass and the beam at the first surface side of the frame and fixed to a cover plate fixing area disposed on the first surface of the frame; an insulation film disposed on the proof-mass at the first surface side; and a projection disposed on said insulation film on the proof-mass at the first surface side to prevent the proof-mass from sticking to the cover plate, wherein the projection is made of the same metal material as the metal wiring pattern and is formed at the same time as the metal wiring pattern.