Patent ID: 7219551
Filing Date: 2007-05-22
Classification: G01L

Abstract:
1. A differential pressure sensor comprising: a pair of diaphragms each capable of being deformed according to a pressure applied, each of said pair of diaphragms being at least partially made of a metal and having a common center axis; a movable electrode provided between said pair of diaphragms and located on said common center axis, said movable electrode being at least partially made of a metal, each of opposing surfaces of said movable electrode including a projection formed at a central portion thereof, said projection being secured to a central portion of an associated one of said diaphragms; and fixed electrodes held by outer peripheral portions of said pair of diaphragms, so as to face said opposing surfaces of the movable electrode, wherein a change in capacitance between said movable electrode and each of said fixed electrodes is detected to determine a differential pressure.