Patent ID: 9351082
Filing Date: 2016-05-24
CPC Classification: H01L,H04R

Claim Text:
1. A capacitance-type transducer comprising: a back plate having a fixed electrode; a diaphragm that opposes the back plate via an air gap and serves as a movable electrode; and at least first stoppers having a first projection length and second stoppers having a second projection length that project from at least one of a surface of the back plate on the air gap side and a surface of the diaphragm on the air gap side, wherein at least one of the diaphragm and the fixed electrode is divided into at least a first region having a first surface area and a second region having a second surface area, a first sensing portion made up of the diaphragm and the fixed electrode is constituted in the first region, and a second sensing portion made up of the diaphragm and the fixed electrode is constituted in the second region, wherein the first stoppers are provided on the first sensing portion, wherein the second stoppers are provided on the second sensing portion, wherein the first surface area of the first region is larger than the second surface area of the second region, and wherein the projection length of the first stoppers is shorter than the projection length of the second stoppers.