Compound membrane, method of manufacturing the same, and acoustic device
A compound membrane ( 100 ) for an acoustic device ( 200 ), the compound membrane ( 100 ) comprising a first layer ( 101 ) and a second layer ( 102 ), wherein a value of Young's modulus of the second layer ( 102 ) does not vary more than essentially 30% in a temperature range between essentially −20° C. and essentially +85° C.
1. A compound membrane for an acoustic device, the compound membrane comprising:
a first layer;
a second layer connected to the first layer,
wherein a value of Young's modulus of the second layer does not vary more than 30% in a temperature range between −20° C. and +85° C.
2. The compound membrane according to claim 1 , wherein the value of Young's modulus of the second layer does not vary more than 30% in a temperature range between −40° C. and +85° C.
3. The compound membrane according to claim 1 , wherein the second layer comprises or consists of a thermoplastic material.
4. The compound membrane according to claim 3 , wherein the thermoplastic material of the second layer has a glass transition temperature in a temperature range between −60° C. and −10 C.
5. The compound membrane according to claim 1 , wherein the second layer comprises of silicone.
6. The compound membrane according to claim 1 , wherein the first layer comprises of a thermoplastic material.
7. The compound membrane according to claim 6 , wherein the thermoplastic material of the first layer has a glass transition temperature in a temperature range between +120° C. and +150° C.
8. The compound membrane according to claim 1 , wherein the value of Young's modulus of the second layer is smaller than a value of Young's modulus of the first layer.
9. The compound membrane according to claim 1 , wherein the second layer is thicker than the first layer.
10. The compound membrane according to claim 1 , wherein the first layer and the second layer have a thickness in a range between 1 μm and 150 μm.
11. The compound membrane according to claim 1 , wherein the compound membrane is particularly adapted to at least one of the group comprising of an electroacoustic transducer, an electrodynamic acoustic device, a piezoelectric acoustic device, a speaker, a microphone, a receiver, and a vibrator.
12. A method of manufacturing a compound membrane for an acoustic device, the method comprising:
forming a second layer on a first layer, wherein a value of Young's modulus of the second layer does not vary more than 30% in a temperature range between −20° C. and +85° C.