Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1982-10-15
1984-01-03
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310336, 310800, 310366, H01L 4108
Patent
active
044244657
ABSTRACT:
A piezoelectric vibration transducer is disclosed which includes a polymeric piezoelectric film as the active element. The film is a selectively or fully polarized, uniaxially oriented material selected from the group of polyvinylidene fluoride, blended material such as polyvinylidene fluoride and PZT powder, polyvinyl fluoride, polyacrylonitrile, copolymers or vinylidene fluoride such as vinylidene fluoride and tetrafluoroethylene or trifluoroethylene. The film is bonded to electrode strips formed by printed circuit methods and then overcoated with a front electrode layer. The sandwich formed by the electrode layers and intermediate polymeric piezoelectric film can be reversed so that the front electrode layer is discontinuous while the back electrode layer is continuous, or both electrode layers can be formed to be discontinuous. Special configurations for the discontinuous pattern of electrode layers can be employed such as that specified by Fresnel's theory.
REFERENCES:
patent: 3433461 (1969-03-01), Scarpa
patent: 3968680 (1976-07-01), Vopilkin et al.
patent: 4184094 (1980-01-01), Kopel
patent: 4217516 (1980-08-01), Iinuma et al.
patent: 4296349 (1981-10-01), Nakanishi
Experimental Broadband Ultrasonic Transducers Using PVF.sub.2 Piezoelectric Film, by Bui, Shaw & Zitelli, Electronics Letters, 8-5-76, vol. 17, No. 6.
Monolithic Silicon-PVF.sub.2 Piezoelectric Arrays for Ultrasonic Imaging, by Swartz & Plummer, presented at the 8th International Symposium on Acoustic Imaging, Key Biscayne, Fla., 5-29-78. Performed Under NIH Grant No. 5 PO1GM17940-03.
Nakanishi Toshiharu
Ohigashi Hiroji
Suzuki Miyo
Budd Mark O.
Toray Industries Inc.
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