Acoustic actuator plate structure

摘要

Acoustic actuator plate structures are used in acoustic applications. The acoustic actuator plate structure according to the invention contains an electret material and comprises a structurally weaker electret layer (1), where the specific resistance of the electret material is at least 10 Ωm and the yield point of it is high, and a structurally stronger support structure layer (2), where the plastic region of the support layer material is wider than the plastic region of the electret material. The electret layer (1) can be formed of a material that retains its electret properties extremely well even in high temperatures and humid conditions. This material may be brittle. The support structure layer (2) provides mechanical and structural strength to the acoustic actuator plate structure.

主权项

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 1014 ohmmeters; 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.