Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-12-08
1989-09-12
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313C, H01L 4108
Patent
active
048663255
ABSTRACT:
The surface acoustic wave transducer in accordance with the present invention comprises a piezo-electric substrate, and a first type electrode-strips set which generates an electric reflection alone with no acoustic reflection and a second type electrode-strips set which generates both of an electric reflection and an acoustic reflection, both types being formed on the piezo-electric substrate. The first type electrode-strips set is formed by electrode strips with approximate width of 1/8 of the wavelength of the surface acoustic wave, while the second type electrode-strips set is formed by electrode strips with approximate width of 1/8 and approximate width of 3/8 of the wavelength of the surface acoustic wave.
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Hartmann et al; "An Analysis of SAW Interdigital Transducers with Internal Reflections and the Application to the Design of Single-Phase Unidirectional Transducers", IEEE, 1982, pp. 40-45.
M. F. Lewis, "Group-Type Unidirectional SAW Devices Employing Intra-Transducer Reflector Banks", Electronics Letters, vol. 19, No. 25/26, Dec. 1983, p. 1085.
Kodama Toshikazu
Sato Koji
Budd Mark O.
Kabushiki Kaisha Toshiba
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