Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1985-07-23
1987-04-14
Wong, Peter S.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310357, 310358, H01L 4108
Patent
active
046581766
ABSTRACT:
An ultrasonic transducer using a piezoelectric composite in which a plurality of piezoelectric poles are arranged in matrix maintaining a gap and a polymer is charged into the gap. The piezoelectric poles are arranged maintaining a pitch which is shorter than a wavelength of a sound wave at a fundamental resonance frequency of the transducer in a medium. Further the pitch may be changed in a direction in which the piezoelectric poles are arranged, in order to restrain the grating lobe from generating.
REFERENCES:
patent: 4412148 (1983-10-01), Klicker et al.
patent: 4518889 (1985-05-01), T Hoen
Katakura Kageyoshi
Nakaya Chitose
Takeuchi Hiroshi
Hitachi , Ltd.
Hitachi Medical Corporation
Todd Voeltz Emanuel
Wong Peter S.
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