Patent ID: 9363609
Filing Date: 2016-06-07
CPC Classification: B81B,B81C,G01L,H04R

Claim Text:
1. A semiconductor microphone comprising: a first conductive membrane layer disposed in or over a substrate, the first conductive membrane layer being a moveable membrane of the microphone; a second conductive membrane layer disposed over the first conductive membrane layer; a cavity structure disposed between the first conductive membrane layer and the second conductive membrane layer, wherein the second conductive membrane layer is separated by the cavity structure from the first conductive membrane layer, wherein the second conductive membrane layer comprises a circumferential side wall extending in a direction to the first conductive membrane layer; an encapsulant layer disposed between the second conductive membrane layer and the first conductive membrane layer, the encapsulant layer comprising a circumferential side wall disposed on the circumferential side wall of the first conductive membrane layer; and a cover layer disposed over a top surface of the cavity structure, the encapsulant layer disposed between the cover layer and the second conductive membrane layer.