Title:
ELECTRET MATERIAL AND ELECTROSTATIC-TYPE ACOUSTIC TRANSDUCER
Document Type and Number:
WIPO Patent Application WO/2010/126012
Kind Code:
A1
Abstract:
Disclosed is an electret material having excellent charge retention properties under heated conditions. Specifically disclosed is an electret material (10) comprising an electrode plate (1), a semiconductive layer (2) formed on the electrode plate (1), and an electret layer (3) formed on the semiconductive layer (3). The semiconductive layer (2) comprises carbon and a fluororesin. In the electret material (10), the decrease in the surface voltage of the electret layer (3) can be prevented when the electret material (10) is heated to a high temperature.
Inventors:
TAKAOKA SEIICHI
Application Number:
PCT/JP2010/057394
Publication Date:
November 04, 2010
Filing Date:
April 26, 2010
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
TAKAOKA SEIICHI
TAKAOKA SEIICHI
International Classes:
H01G7/02; H04R19/01; H04R19/02; H04R19/04
Foreign References:
| JP2009088100A | 2009-04-23 | |||
| JPH11219851A | 1999-08-10 | |||
| JPH11150795A | 1999-06-02 | |||
| JPH05142961A | 1993-06-11 |
Other References:
See also references of EP 2426683A4
Attorney, Agent or Firm:
HASHIMOTO Kimihide et al. (JP)
Kimihide Hashimoto (JP)
Kimihide Hashimoto (JP)
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