Patent ID: 8045733
Filing Date: 2011-10-25
Classification: H04R

Abstract:
1. A backplateless silicon microphone, comprising: (a) a substrate having a front side and a back side with a backside hole formed through said substrate; (b) a dielectric spacer layer formed on the front side of the substrate; (c) a diaphragm that is aligned above said backside hole and is made of a membrane layer formed on the dielectric spacer layer, said diaphragm has a center and an outer edge; (d) a plurality of perforated plates having one side adjoining said outer edge of the diaphragm, said perforated plates are made of said membrane layer; (e) a perforated spring that is made of said membrane layer and is comprised of a plurality of outer beams that are connected to a plurality of “m” pads where “m” ≧3, and a plurality of inner beams that are attached to the outer edge of said diaphragm; (f) a plurality of “m” pads made of said membrane layer and formed on the dielectric spacer layer wherein a pad and an underlying portion of the dielectric spacer layer form a rigid anchor; and (g) an air gap formed within said dielectric spacer layer and below said diaphragm, plurality of perforated plates, and spring.