Patent ID: 7804969
Filing Date: 2010-09-28
Classification: B81B,H04R

Abstract:
1. A microphone sensing element without a dedicated backplate component, comprising: (a) a substrate having a front side and a back side with one or a plurality of back holes formed therein; (b) a dielectric spacer layer formed on the front side of the substrate; (c) a diaphragm that is aligned above said one or plurality of back holes and is made of a membrane layer formed on the dielectric spacer; (d) a plurality of perforated plates with a plurality of holes therein which adjoin the diaphragm, said perforated plates are suspended over the substrate with an air gap therebetween and are made of said membrane layer; (e) a plurality of mechanical springs made of said membrane layer and attached to said diaphragm wherein each mechanical spring has two ends in which one end is attached to the diaphragm and a second end is connected to a pad that is formed on the dielectric layer and anchored to the substrate; and (f) a plurality of stopper structures comprised of a lower anchor portion and an upper finger portion having one or a plurality of fingers that overhang the perforated plates and restrict an upward motion of the diaphragm and perforated plates away from the substrate during a vibration.