Electricity: electrical systems and devices – Electric charge generating or conducting means – Use of forces of electric charge or field
Patent
1976-10-01
1978-01-03
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Electric charge generating or conducting means
Use of forces of electric charge or field
H01G 702
Patent
active
040670562
ABSTRACT:
An apparatus and method for continuously poling a film of material exhibiting pyroelectric and/or piezoelectric characteristics are disclosed. The apparatus includes a drive for advancing the film, a hot poling roller, a cold fixing roller, and a pair of electrodes that establish an electric field across the film while it is heated by the hot roller. In a first embodiment, one side of the film is coated with a conductive layer that is electrically grounded to serve as a ground electrode and the poling roller serves as a high voltage electrode for establishing the electrical field across the film. In a second embodiment, the poling roller is electrically grounded and a plurality of corona charging devices are employed as the high voltage electrode. In both embodiments, the poling roller is separated from direct physical contact with the film by a resistive layer in order to avoid serious damage to the film due to electrical arcing that can occur through a defective or thinner than normal area of the film.
REFERENCES:
patent: 2740184 (1956-04-01), Thomas
patent: 3571679 (1971-03-01), Van Turnhout
patent: 3885301 (1975-05-01), Murayama
Sheffield William F.
Taylor Allen L.
Alexander Cruzan
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Moose Jr. Harry E.
Sell Donald M.
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