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|1. (WO2017154414) CAPACITIVE TRANSDUCER AND ACOUSTIC SENSOR|
|Title:||CAPACITIVE TRANSDUCER AND ACOUSTIC SENSOR|
Provided is a technology with which damage to a vibrating electrode film can be prevented by suppressing excessive deformation of the vibrating electrode film regardless of the direction in which the vibrating electrode film undergoes deformation when an acoustic sensor is subjected to excessive pressure. The invention is provided with a backplate 37 and a vibrating electrode film 35 being provided so as to face the backplate 37 with a gap therebetween, and is further provided with a pressure release hole 35b, which is provided in the vibrating electrode film 35, a protruding portion 37b, which is provided integrally to the backplate 37 using the same member as the backplate 37 and intrudes into the pressure release hole 35b in a state before deformation of the vibrating electrode film 35, and a pressure release flow path, which is an air flow path formed by a gap between the pressure release hole 35b and the protruding portion 37b, wherein the protruding portion 37b has, in a prescribed region on the backplate side 37, a reduced cross-sectional area portion which has a smaller cross-sectional area than a region further to the tip side than the prescribed region of the protruding portion 37b.