Capacitive transducer and a method for manufacturing a transducer
First Claim
1. A capacitive transducer comprising:
- a polymer film having a first surface and a second surface,a first electrically conductive layer arranged on the first surface of the polymer film, anda second electrically conductive layer arranged on the second surface of the polymer film,wherein the polymer film is at least partly made from a material having a molecular weight which is at least 21,000 g/mol,wherein the polymer film is a structure comprising at least two layers of polymer material,wherein at least a first of the layers of polymer material is made from a material having a molecular weight which is at least 21,000 g/mol, and at least a second of the layers of polymer material is made from a material having a molecular weight which is between 7,000 g/mol and 21,000 g/mol.
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Accused Products
Abstract
A capacitive transducer (1) comprises a polymer film (2) having a first surface and a second surface, a first electrically conductive layer (3) arranged on the first surface of the polymer film (2), and a second electrically conductive layer (3) arranged on the second surface of the polymer film (2). The polymer film (2) is at least partly made from a material having a molecular weight which is at least 21,000 g/mol. The inventors have surprisingly found that silicone polymer materials with high molecular weights, such as liquid silicone rubbers (LSR) or high temperature vulcanizing (HTV) elastomers, have high electrical breakdown strengths, even though technical data sheets from manufacturers state almost identical electrical breakdown strengths similar to that of RTV-2 elastomers. Using such materials in capacitive transducers allows high electrical fields to be applied to transducers without risking electrical breakdown, thereby increasing performance of transducers.
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Citations
17 Claims
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1. A capacitive transducer comprising:
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a polymer film having a first surface and a second surface, a first electrically conductive layer arranged on the first surface of the polymer film, and a second electrically conductive layer arranged on the second surface of the polymer film, wherein the polymer film is at least partly made from a material having a molecular weight which is at least 21,000 g/mol, wherein the polymer film is a structure comprising at least two layers of polymer material, wherein at least a first of the layers of polymer material is made from a material having a molecular weight which is at least 21,000 g/mol, and at least a second of the layers of polymer material is made from a material having a molecular weight which is between 7,000 g/mol and 21,000 g/mol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification