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Title:
ELECTRET MATERIAL AND ELECTROSTATIC ACOUSTIC TRANSDUCER
Document Type and Number:
Japanese Patent JP2010279024
Kind Code:
A
Abstract:

To provide an electret material with superior electric charge retaining properties against heat.

The electret material 10 has an electrode plate 1, a semiconductor layer 2 formed on the electrode plate 1, and an electret layer 3 formed on the semiconductor layer 3. The semiconductor layer 2 includes carbon and fluororesin. The electret material 10 suppresses decreases in the surface potential of the electret layer 3 when heated to high temperature. Preferably, the surface resistance of the semiconductor layer 2 lies in the range of 1.0×108 to 1.0×1015 Ω/SQUARE.


Inventors:
Takaoka, Seiichi
Application Number:
JP2010000099329
Publication Date:
December 09, 2010
Filing Date:
April 23, 2010
Export Citation:
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Assignee:
NITTO DENKO CORP
International Classes:
H04R19/01; H01G7/02
Domestic Patent References:
JPH11219852A
JP2003199197A
JPH11219851A
JP2009088100A
JPH11219852A
Attorney, Agent or Firm:
鎌田 耕一
麻生 紀明