Method and apparatus for implanting a charge in an electret foil

Details Method and apparatus for implanting a charge in an electret foil Method and apparatus for implanting a charge in an electret foil

1980-06-25

1982-09-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Electric charge generating or conducting means

Use of forces of electric charge or field

307400, H01G 702

Patent

active

043487114

ABSTRACT:
In previously proposed arrangements for charging an electret foil the electret charge implanted varies over the area of the foil. In order to promote more even charging of the foil, the method of the invention subjects the foil to a progressively increasing electric field. One form of apparatus used to carry out the method has rollers at progressively higher potentials and electric fields are applied across the foil between these rollers and a metallized layer on the rear face of the foil which is earthed by a roller.

REFERENCES:
patent: 2757165 (1973-09-01), Adachi et al.
patent: 3626260 (1971-12-01), Kimura
patent: 3678350 (1972-07-01), Matsumoto et al.
patent: 3684364 (1972-09-01), Schmidlin
patent: 3873895 (1975-03-01), Gallo, Jr. et al.
patent: 4089034 (1978-05-01), Taylor et al.
"Electret Transducers Applied to the Telephone"--Roedyk, IEEE Transactions on Audio & Electroacoustics, vol.-AU-19, No. 1, 3/71.

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