Compound membrane and acoustic device using same

1. An acoustic compound membrane comprising:

A central layer;

A first glue layer attached to one side of the central layer;

A second glue layer attached to another side of the central layer;

An upper layer provided on the first glue layer; and

A lower layer provided beneath the second glue layer;

Wherein the center layer comprises material of Polyethyleneterepthalatel; and

Wherein the material of the upper layer or the lower layer is selected from Polyetherimide, Polyetherketone, and Polyphnylens sulfide.

2. The compound membrane as described in claim 1 , wherein the glue layers comprises material of acrylic.

3. An acoustic device comprising:

a compound membrane as described in one of claims 1 to 2 .