Patent ID: 7907744
Filing Date: 2011-03-15
Classification: A61B,G01H,H01L,H04R

Abstract:
1. A capacitive vibration sensor comprising: a vibration electrode plate and an opposing electrode plate that are aligned face to face with each other and placed on a surface of a semiconductor substrate so as to cover a space formed in the semiconductor substrate, wherein a plurality of etching holes are opened through the vibration electrode plate, and a part of the vibration electrode plate is separated apart from the semiconductor substrate, with a holding portion being left, by the etching holes of the vibration electrode plate, so that a diaphragm is formed; etching holes are opened on the opposing electrode plate in such a manner that each etching hole is overlapped with each of the etching holes of the vibration electrode plate, with adjacent rectangles, each circumscribing the etching hole, of the opposing electrode plate being made in contact with each other or overlapped with each other, when viewed in a direction perpendicular to the surface of the semiconductor substrate; and the space of the semiconductor substrate is formed by carrying out an etching process from the surface side of each of the two electrode plates to the opposite side of each of the two electrode plates through each of the etching holes of the opposing electrode plate and the vibration electrode plate.