Patent ID: 9301055
Filing Date: 2016-03-29
CPC Classification: B32B,H04R

Claim Text:
1. An acoustic actuator plate structure that has a conductorless multi-layer electret that takes the form of an electret layer and a support structure layer that is connected directly to and moves with the electret layer, the electret layer being made of an electret material and the support structure layer being made of a support structure layer material, wherein: a stress-strain curve for the electret material has a plastic region and a stress-strain curve for the support structure layer material also has a plastic region; the specific resistance of the electret material is at least 10 the yield point of the electret material is not lower than the yield point of cyclic olefin copolymer (COC) and cyclic olefin polymer (COP); and the plastic region of the support structure layer material is wider, in terms of % strain on the stress-strain curve, than the plastic region of the electret material.