Method and apparatus for implanting a charge in an electret...

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

H - Electricity

01

G

317/3, 349/67, 2

H01G 13/00 (2006.01) H01G 7/02 (2006.01)

Patent

CA 1150816

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.

354480

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