发明名称 |
MACHINE AND METHOD FOR POLING FILMS OF PYROELECTRIC AND PIEZOELECTRIC MATERIAL |
摘要 |
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 an electric field greater than 1000 K volts/cm across the film for less than 180 seconds. 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. In a first embodiment, 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 to provide the second electrode. In a second embodiment both electrodes are provided by hot poling rollers with one being connected to a high voltage potential and the other to ground potential. Both embodiments utilize ambient air to cool the film while such pyroelectric and piezoelectric properties exist in the film. A third embodiment is similar to the first except that the hot poling roller of the first embodiment is a cold poling roller and a radiant source heats the film during poling. In all three embodiments 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. |
申请公布号 |
GB1576031(A) |
申请公布日期 |
1980.10.01 |
申请号 |
GB19770018074 |
申请日期 |
1977.04.29 |
申请人 |
MINNESOTA MINING & MFG CO |
发明人 |
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分类号 |
C08J7/00;H01B3/30;H01G7/02;H01L41/45;(IPC1-7):01L41/22 |
主分类号 |
C08J7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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