Method for producing electret-containing devices

Details Method for producing electret-containing devices Method for producing electret-containing devices

1984-03-26

1986-09-16

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

29 2535, 29592E, 264 24, 264 27, 264104, 4251748R, B29C 7104, B29C 1308

Patent

active

046121455

ABSTRACT:
A new method for fabricating electret-containing devices is disclosed. The inventive method includes a new technique for fabricating electrets, which involves applying a voltage across an electrically polarizable body. Large-scale breakdown effects in the body are avoided by reducing the voltage across at least a portion of the body undergoing polarization in response to a current indicating the onset of a breakdown in the body.

REFERENCES:
patent: 3899558 (1975-08-01), Fleming et al.
patent: 3943614 (1976-03-01), Yoshikawa et al.
patent: 4243460 (1981-01-01), Nagler
patent: 4248808 (1981-02-01), West
patent: 4260566 (1981-04-01), Brouwer et al.
patent: 4346505 (1982-08-01), Lemonon et al.
patent: 4379098 (1983-04-01), Gumienny
"Polarization of (PVF.sub.2) by Application of Breakdown Fields", J. Appl. Phys. 53(10), Oct., 1982, pp. 6552-6556 . . . Wang et al.
"Piezoelectricity in .beta.-Phase (PVF.sub.2) Having a Single-Crystal Orientation", J. Appl. Phys. 50(10), Oct. 1979, Wang, pp. 6091-6094 . . .

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