Patent ID: 9319798
Filing Date: 2016-04-19
CPC Classification: B81B,H01L,H04R

Claim Text:
1. A capacitive transducer comprising: a back plate including a fixed electrode; a diaphragm facing the back plate with an air gap interposed therebetween, the diaphragm acting as a movable electrode; at least a first stopper of a first protruding length; and a second stopper of a second protruding length, wherein the first and second stoppers protrude from at least either the surface on the back plate near the air gap or the surface on the diaphragm near the air gap, wherein the first stopper is provided at a position corresponding to a first position on the diaphragm, wherein the second the stopper is provided at a position corresponding to a second position on the diaphragm, wherein an amount of displacement of the diaphragm at the first position is greater than an amount of displacement of the diaphragm at the second position, wherein the protruding length of the first stopper is shorter than the protruding length of the second stopper, wherein the first position is a region where the diaphragm undergoes a large displacement, wherein the first stopper protrudes from the diaphragm at the first position, wherein the second position is a region where the diaphragm undergoes a small displacement, and wherein the second stopper protrudes from the diaphragm at a position facing the second position.