ACOUSTIC MEMBRANE WITH ASYMMETRIC LAYER ARRANGEMENT
A membrane for an acoustic transducer may comprise a first layer comprising a first material, a second layer disposed on the first layer, the second layer comprising a second material that is different from the first material, and a third layer disposed on the second layer, the third layer comprising a third material that is different from the first material and the second material, the third layer configured to be coupled with a moveable coil. The first material may be a polyaryletherketone (PAEK), the second material may be acrylate, and the third material may be polyetherimide (PEI), polycarbonate (PC), or another similar material.
1 . A membrane for an acoustic transducer, the membrane comprising:
a first layer, the first layer comprising a first material;
a second layer, disposed on the first layer, the second layer comprising a second material that is different from the first material; and
a third layer configured to be coupled with a moveable coil, the third layer disposed on the second layer, the third layer comprising a third material that is different from the first material and the second material;
wherein the first material comprises a polyaryletherketone, the second material comprises adhesive, and the third material is selected from the list consisting of polyetherimide, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, and polyarylate.
2 . The membrane of claim 1 , wherein the first material comprises polyetheretherketone.
3 . The membrane of claim 1 , wherein the third material comprises polyetherimide.
4 . The membrane of claim 1 , wherein the third material has a higher glass transition temperature than the first material.
5 . The membrane of claim 1 , wherein respective radial cross-sections of the first layer, the second layer, and the third layer have substantially the same dimensions.
6 . The membrane of claim 1 , wherein the second material comprises acrylate adhesive or silicon adhesive.
7 . The membrane of claim 1 , wherein the first layer, the second layer, and the third layer are the only layers of the membrane.
8 . A method of manufacturing an acoustic transducer, the method comprising:
providing a first membrane layer, the first membrane layer comprising a polyaryletherketone material;
disposing a second membrane layer on the first membrane layer, the second membrane layer comprising adhesive; and
disposing a third membrane layer on the second membrane layer, the third membrane layer comprising a second thermoplastic material that is different from the first thermoplastic material, the second thermoplastic material comprising at least one of polyetherimide, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, and polyarylate.
9 . The method of claim 8 , further comprising coupling the third membrane layer with a coil.
10 . The method of claim 9 , wherein coupling the third membrane layer with a coil comprises gluing the third membrane layer to the coil.
11 . The method of claim 8 , further comprising thermoforming the first layer, the second layer, and the third layer into a membrane.
12 . The method of claim 11 , wherein the thermoforming comprises stamping.
13 . The method of claim 11 , wherein the thermoforming comprises drawing.
14 . The method of claim 8 , wherein the second thermoplastic material is polyetherimide.
15 . The method of claim 14 , wherein the first thermoplastic material is a polyaryletherketone.
16 . An acoustic transducer, comprising:
a moveable electromagnetic coil; and
a membrane, the membrane comprising:
a first layer comprising a first material;
a second layer, disposed on the first layer, the second layer comprising a second material that is different from the first material; and
a third layer, disposed on the second layer and coupled with the coil, the third layer comprising a third material that is different from the first material and the second material;
wherein the first material comprises a polyaryletherketone, the second material comprises adhesive, and the third material is selected from the list consisting of polyetherimide, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, and polyarylate.
17 . The transducer of claim 16 , wherein the second material comprises acrylate adhesive or silicon adhesive.
18 . The transducer of claim 16 , wherein the first layer comprises polyetheretherketone.
19 . The transducer of claim 16 , wherein the first layer, the second layer, and the third layer are the only layers of the membrane.
20 . The transducer of claim 16 , wherein respective radial cross-sections of the first layer, the second layer, and the third layer have substantially the same dimensions.