Patent ID: 9728653
Date: 2017-08-08
CPC Classifications: B81B,H01L,H04R

Claim:
1. A MEMS device comprising: a membrane comprising a released portion having a first plurality of fingers; a counter electrode arrangement comprising a second plurality of fingers disposed in an interdigitated relationship with the first plurality of fingers, wherein the second plurality of fingers are moveable in relation to the released portion having the first plurality of fingers; a support, wherein the membrane is attached to the support resiliently by a resilient attachment, so that the released portion of the membrane is movable with respect to the support; and a deflector directly or indirectly affixed to the membrane and configured to deflect the membrane such that the first and second plurality of fingers are displaced in a rest position excluding maximum overlapping of surfaces of the fingers, wherein the deflector comprises a stress layer bonded to a surface of the membrane, and wherein the dielectric material of the stress layer and the material of the membrane are selected such that the different intrinsic stress of the dielectric material of the stress layer compared to the material of the membrane causes the resilient attachment to bend and the membrane to deflect.