| 摘要 |
<p>Pressure sensitive apparatus for producing electrical signals, on two electrodes. The apparatus has a layered structure consisting of a conductive layer (10), a piezoelectric polymer film layer (12), an electrode layer (14), an insulating layer (16), another electrode layer (18), another piezoelectric polymer film layer (20), and another conductive layer (22). The layered structure may be constructed from an insulating layer (16) sandwiched between two piezoelectric polymer films (12 and 20) each having an electrode (14 and 18) on one surface thereof and having a conductive plane (10 and 22) on the other surface thereof disposed on each side of the insulating layer (16) with the electrodes (14 and 18) in closest proximity to the insulating film (16). Further, support substrates (24 and 26) may be disposed on each side of the piezoelectric polymer films (12 and 20), the support substrates (24 and 26) having an opening (28) where the electrodes are located. Still, further, the apparatus may be adapted for a pressure sensitive matrix keyboard having a plurality of keyboard switch positions arranged in a plurality of rows (14) and columns (18) where the electrodes are a strip constituting one of the rows and columns, respectively, of the keyboard switch positions. The piezoelectric polymer film (12 and 20) may be polyvinylidene fluoride and the layered structure may be integrally bonded or physically sandwiched together and may have connected to it an electrical sensing circuit suitable for amplifying a small charge pulse induced by the strain upon the piezoelectric polymer film (12 and 20). The apparatus is suitable for matrix encoding, has electrical shieldings, is easy to insulate with the conductive layers on the outside of the layered structure. The apparatus does not suffer from contact oxidation, is sensitive to gloved operation and insensitive to the build up of dirt and grease.</p> |
