Patent ID: 6430999
Filing Date: 2002-08-13
Classification: G01C,G01P

Abstract:
A semiconductor physical quantity sensor for detecting a physical quantity, the physical quantity sensor comprising:a support substrate; a fixed portion fixed to the support substrate and having a fixed electrode; a movable portion separated from the fixed portion through a groove and movably connected to the support substrate, the movable portion having a movable electrode extending to face the fixed electrode; and a beam connecting the movable portion and the support substrate and having a spring function for displacing the movable portion in a displacement direction, the beam having a rectangular frame shape with a hollow portion and being surrounded by the groove, wherein: the hollow portion has a first interval in the displacement direction; the groove surrounding the beam has second and third intervals at both sides of the beam in the displacement direction, both of the second and third intervals being equal to the first interval of the hollow portion.