公开(公告)号：US4340786A

公开(公告)日：1982-07-20

申请号：US115826

申请日：1980-01-28

Applicant: Norman W. Tester

Inventor： Norman W. Tester

IPC: H01L41/45 ,  H04R17/00 ,  B29D7/24 ,  H01J41/18

CPC classification number: H01L41/45 ,  H01L41/193 ,  H01L41/257 ,  Y10T428/24909 ,  Y10T428/24917

Abstract: A process for making piezo-electric polyvinylidene fluoride (PVDF) film for use, for example, as diaphragms for telephone transmitters, includes the steps of: (a) stretching the melt-extruded film parallel to the extrusion direction with a stretch ratio of about 4 to 1 at about 120.degree. C. to convert it to a .beta. crystalline form; (b) clamping the film between conductive rubber pads to which the polarizing voltage, e.g. 1.3 kv for 12 .mu.m film is applied. While the voltage is thus applied, the film is heated to about 110.degree. C. for 130 mins. and cooled to ambient with the polarizing filed preset; (c) conductive elastomer electrodes are applied to the film in the desired pattern; and (d) the piezo-electric properties are stabilized by heating the foil to about 90.degree. C. for 2 hours.

Abstract translation: 用于制造例如用作电话发射器的隔膜的压电聚偏二氟乙烯（PVDF）膜的方法包括以下步骤：（a）以大约的拉伸比拉伸熔融挤出的膜与挤出方向平行的拉伸比 在约120℃下将其转化为β晶型; （b）将薄膜夹在极化电压例如导电橡胶垫之间。 施用1.3mv的12μm膜。 在施加电压的同时，将膜加热至约110℃，持续130分钟。 并用预定的极化场冷却至环境温度; （c）以期望的图案将导电弹性体电极施加到膜上; 和（d）通过将箔加热至约90℃2小时来稳定压电特性。