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Title:
ELECTRET MANUFACTURING METHOD AND POROUS ELECTRET MANUFACTURING APPARATUS
Document Type and Number:
Japanese Patent JP2010010462
Kind Code:
A
Abstract:

To easily manufacture a porous high-voltage electret.

A die plate 200 is a ceramic plate where a plurality of holes 210 are regularly located, and a punch plate 100 is also a ceramic plate having a plurality of punches 110 to be fit with the holes of the die plate 200. To open holes in an electrode 20 and an electret 40 by means of the punch plate 100 and the die plate 200, the electrode 20 and the electret 40 which are integrally formed are placed on the die plate 200. Then, when the punch plate 100 is pressed against the electret 40, portions through which the punches 110 have passed in the electrode 20 and the electrets 40 are punched out and the punches 110 penetrating through the electret 40 and the electrode 20 are fit with the holes 210 of the die plate 200 so that holes 2 are opened in the electrode 20 and the electret 40.


Inventors:
Takano, Yasuaki
Nakatani, Takao
Application Number:
JP2008000168877
Publication Date:
January 14, 2010
Filing Date:
June 27, 2008
Export Citation:
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Assignee:
YAMAHA CORP
International Classes:
H01G7/02
Attorney, Agent or Firm:
特許業務法人朝日特許事務所