Composite for production of an acoustic membrane and acoustic membrane

Patent metadata

Field	Value
Publication number	US-9827749-B2
Application number	US-201414784642-A
Country	US
Kind code	B2
Filing date	Mar 31, 2014
Priority date	Apr 16, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

The invention relates to a composite for production of an acoustic membrane, wherein the composite comprises an internal carrier layer and at least two adhesive layers on the two surfaces of the carier layer, and wherein the carrier layer is a layer of a polyaryl ether ketone film; and also to a corresponding membrane for acoustic transducers.

First claim

The invention claimed is:

1. An assembly for producing an acoustic membrane, the assembly comprising (A) an inner carrier layer having two opposing surfaces, (B) at least one layer of adhesive on each of the two surfaces of the carrier layer and (C) a further polymeric film disposed on an outer surface of at least one of the layers of adhesive, wherein the carrier layer is a layer of a polyaryletherketone (PAEK) film, wherein said layer of a PAEK film is the only layer of a PAEK film in the assembly, and wherein an acoustic membrane produced from said assembly exhibits a more uniform frequency response characteristic and a lower harmonic distortion factor than an acoustic membrane produced from a comparison assembly that has an inner carrier layer of polyethylene terephthalate (PET).

2. The assembly of claim 1 , wherein the polyaryletherketone film is a polyetheretherketone film.

3. The assembly of claim 1 , wherein the adhesive of at least one layer of adhesive is a self-adhesive.

4. The assembly of claim 1 , wherein both layers of adhesive are layers of self-adhesive.

5. The assembly of claim 1 , wherein the adhesive of at least one layer of adhesive is an acrylate adhesive.

6. The assembly of claim 1 , wherein
the inner PAEK film layer has a thickness of 1 to 50 μm and/or
the layers of adhesive independently of one another each have a thickness of 1 to 100 μm.

7. The assembly of claim 1 , wherein a liner is disposed on an outer surface of at least one of the layers of adhesive.

8. The assembly of claim 1 , wherein each further polymeric film has a thickness of 1 to 50 μm.

9. The assembly of claim 1 , which is symmetrical in terms of layer thicknesses and/or layer composition.

10. A membrane for electroacoustic transducers obtainable by embossing or thermoforming an assembly of claim 1 .

11. Loudspeakers comprising electroacoustic transducers comprising a membrane of claim 10 .

12. The assembly of claim 1 , wherein the further polymeric film is selected from the group consisting of polyethylene naphthalate (PEN), polyarylate (PAR), polyetherimides (PEI), polyarylsulfones (PAS), and polyethersulfones (PES).

13. The assembly of claim 12 , which has the layer structure PAR-acrylate layer-PEEK-acrylate layer-PAR.

14. A membrane for electroacoustic transducers obtainable by embossing or thermoforming an assembly of claim 13 .

15. Loudspeakers comprising electroacoustic transducers comprising a membrane of claim 14 .

Assignees

• Tesa Se

Inventors

• Egger Michael
• MüSSIG BERNHARD
• Schultz Philip

Classifications

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B27/288

  comprising polyketones · CPC title

• B32B2307/10

  having particular acoustical properties · CPC title

• H04R2499/11

  Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's · CPC title

• H04R7/10

  comprising superposed layers in contact · CPC title