Patent ID: 6848310
Filing Date: 2005-02-01
Classification: G01P,G01R

Abstract:
1. A capacitive dynamic quantity sensor comprising: a semiconductor substrate; a weight, which is movably supported by the semiconductor substrate; a first movable electrode, which is integrated with the weight; and two first fixed electrodes, which are stationarily supported by the semiconductor substrate, wherein the first fixed electrodes face the first movable electrode to provide a first narrow gap and a first wide gap and form a first detection part having a first capacitance, wherein the weight and the first movable electrode are displaced relative to the first fixed electrodes in response to a dynamic quantity to be detected such that one of the gaps increases while the other decreases, wherein the dynamic quantity is detected on a basis of a variation in the first capacitance, and wherein one of wide gap electrode surfaces, which define the first wide gap, is smaller than narrow gap electrode surfaces, which define the first narrow gap, to improve sensor sensitivity.