Patent ID: 9199837
Filing Date: 2015-12-01
Classification: B81B,B81C,H01L,H04R

Abstract:
1. A manufacturing method of an acoustic sensor, wherein the acoustic sensor comprises: a semiconductor substrate comprising a back chamber; a conductive diaphragm arranged on an upper side of the semiconductor substrate through anchors; an insulating fixed film fixed on an upper surface of the semiconductor substrate to cover the conductive diaphragm with a gap; a conductive fixed electrode film arranged on the insulating fixed film at a position facing the conductive diaphragm; and an electrode terminal that outputs a change in electrostatic capacitance between the conductive fixed electrode film and the conductive diaphragm to an outside as an electric signal, wherein the manufacturing method comprises: wherein an adhesive layer that is made from a material different from the insulating fixed film and that is thinner than the protective film is formed on an outer side of the thick film layer after forming the space shaping portion.