Patent ID: 7272974
Filing Date: 2007-09-25
Classification: G01P,H01L

Abstract:
1. A capacitance type physical quantity sensor comprising: a sensor chip for detecting a physical quantity; and a circuit chip for processing a signal outputted from the sensor chip, wherein the sensor chip includes: the sensor chip is capable of detecting the physical quantity on the basis of a capacitance change of a capacitor provided between the movable electrode and the fixed electrode, the capacitance change is provided by a displacement of the movable electrode in accordance with the physical quantity, the sensor chip is stacked on the circuit chip in such a manner that the movable electrode and the fixed electrode face the circuit chip, the sensor chip is electrically connected to the circuit chip, the movable electrode has a thickness in a stacking direction of the sensor chip, the sensor chip has a first distance between the movable electrode and the circuit chip and a second distance between the movable electrode and the support substrate, and the thickness of the movable electrode is larger than the first distance and the second distance, wherein the circuit chip includes a protection film disposed on one side of the circuit chip, and the protection film faces the movable electrode so that a distance between a surface of the protection film and the movable electrode provides the first distance.