Patent ID: 8976985
Filing Date: 2015-03-10
Classification: H01L,H04R

Abstract:
1. An acoustic sensor, comprising: a substrate having a hollow section; a thin film-like diaphragm, arranged above the substrate so as to cover the hollow section; a movable electrode plate, formed on the diaphragm; a back plate, fixed to a top surface of the substrate so as to be opposed to the diaphragm; and a fixed electrode plate, provided on the back plate in a position opposed to the movable electrode plate, characterized in that the diaphragm is supported along a periphery of the diaphragm on the substrate or the back plate by a plurality of supporting sections, the diaphragm has points, at which a displacement amount is maximal at a time of vibration, the plurality of supporting sections supports the periphery of the diaphragm on both sides of the diaphragm segmented by a line segment connecting between adjacent maximal points at which the displacement amount of the diaphragm is maximal, and the plurality of supporting sections supports the periphery of the diaphragm in an area of the diaphragm between the adjacent maximal points.