Electricity: electrical systems and devices – Electric charge generating or conducting means – Use of forces of electric charge or field
Patent
1976-04-30
1978-05-09
Goldberg, Gerald
Electricity: electrical systems and devices
Electric charge generating or conducting means
Use of forces of electric charge or field
29 2542, H05F 102, H05F 302
Patent
active
040890341
ABSTRACT:
An apparatus and method for rapidly and continuously poling a film of polymeric material exhibiting at least one of pyroelectric and piezoelectric characteristics to yield a poled film having a high coefficient of at least one of pyroelectric and piezoelectric properties, and a high degree of uniformity of polarization throughout its thickness. The method of the present invention includes applying a plurality of time-spaced electric field pulses across a portion of the film. The apparatus of the present invention includes a drive for advancing the film and a pair of electrodes that establish an electric field across the film. A hot poling roller serves as a high voltage electrode and a grounded roller contacts a conductive layer coated on the other side of the film. A voltage source and a switch coact to apply a plurality of time-spaced electric field pulses between the two electrodes. The width of each pulse is less than the time a portion of the film is under the influence of the electric field established by the two electrodes. The high voltage electrode 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.
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patent: 3885301 (1975-05-01), Murayama
patent: 3963488 (1976-06-01), Brushenko
Applied Physics Letters vol. 24, No. 10, May 15, 1974, pp. 456.458.
"Pyroelectricity in PVF"; Journal of Applied Physics vol. 44, No. 5, May 1973, pp. 2064-2071.
Journal of Polymer Science vol. 13, May 1975, pp. 1033-1047, "Persistent Polarization in PVF".
Applied Physics Letters vol. 28, No. 5, Mar. 1976, pp. 250-252.
Sheffield William F.
Taylor Allen L.
Alexander Cruzan
Goldberg Gerald
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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