Document Type and Number:
Japanese Patent JPS6134280
Kind Code:
B2
Abstract:
PURPOSE:To enhance the piezoelectric modulus and pyroelectric coefficient by a method wherein the interval between a heating part and positioning roll or the temperature within the heating part is appropriately adjusted to control a necking position, and immediately after necking the polarization is performed by corona discharge. CONSTITUTION:The temperature of the heating part 4 is set at 80 deg.C, and the speed of a wind-up roll is set for the passage of a polyvinylidene fluoride film 7 through the heating part 4 in approx. 10min. When the interval W between the heating part 4 and positioning roll 5 is set at 20cm, the necking position is set 25cm off the positioning roll. On the both surfaces of a film obtained by polarization with the voltage impressed on an extended film in a corona house 2, Al and Ni are evaporated to provide an electrode. Thus, the productivity of a film with high piezoelectric and pyroelectric characteristics can be enhanced.
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Inventors:
TAKEDA KOJI
KOBAYASHI TERUO
YAMAMOTO KAZUMASA
KOBAYASHI TERUO
YAMAMOTO KAZUMASA
Application Number:
JP5488481A
Publication Date:
August 06, 1986
Filing Date:
April 10, 1981
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
B29C55/00; B29C49/00; B29C71/04; B29D7/00; C08J7/00; H01G7/02; H01G7/04; H01L41/45