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10-08-2014

Polymer Speaker

A polymer speaker (1) is configured to include an electrostrictive element (10) having an elastomer or resin dielectric layer (11) and a plurality of electrode layers (12a, 12b) arranged on the front and back surfaces of the dielectric layer (11). The electrode layers (12a, 12b) are formed from a conductive material including a polymer binder and a conductor and having a modulus of elasticity of 100 MPa or less. The spring constant of the electrode layers (12a, 12b) in the surface direction is smaller than the spring constant of the dielectric layer (11) in the surface direction. The volume resistivity of the electrode layers (12a, 12b) is 200 ©·cm or less. The polymer speaker (1) provides a practical sound pressure in a wide frequency region from low frequencies to high frequencies.

Document: EP2787747A1
Click here for the full patent text at DEPATISnet [PDF]
Published patent application
Disclosure date: 11-27-2012
Publication date: 10-08-2014
Applicant: TOKAI RUBBER IND LTD, JP
Inventor: ITO TAKAMASA, JP ; KONDO MITSUYOSHI, JP ; NAKANO KATSUHIKO, JP ; YOSHIKAWA HITOSHI, JP


© European Patent Office. This information was obtained from the espacenet of the European Patent Office. There is no guarantee of its correctness or curency. For additional information, please use the research at espacenet. It is possible to determine the current legal and procedural status of patents and utility patents/models at http://worldwide.espacenet.com/ kfree of charge.

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