Patent ID: 8824707
Filing Date: 2014-09-02
Classification: H01L,H04R

Abstract:
1. A method for building an acoustic element within a laminate structure comprising the steps of forming a first laminate structure having a first laminate layer with a first metal foil bonded to the first laminate layer, patterning a second metal foil over the first metal foil, forming a second laminate structure having a second laminate layer with a cavity formed therein and a third metal foil bonded to the second laminate layer beneath the cavity, bonding the first and second laminate structures together placing the patterned second metal foil over the cavity, forming an opening in the first laminate layer to expose the first metal foil, introducing a chemical etchant through the opening to etch away the first metal foil leaving the patterned second metal foil, wherein a portion of the patterned second metal foil freestanding and movable.