Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1998-01-15
1999-11-02
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4108
Patent
active
059776862
ABSTRACT:
A transversal-coupled resonator type surface acoustic wave filter includes a piezoelectric substrate and first and second interdigital transducers. The piezoelectric substrate has a pair of substrate edges which are substantially parallel to each other and reflect a shear horizontal type surface wave excited and propagated on a surface of the piezoelectric substrate in a direction perpendicular to the substrate edges. The first and second interdigital transducers have the same resonance characteristics and are provided on the piezoelectric substrate. Each of the first and second interdigital transducers includes a pair of outermost electrode fingers which are arranged to be flush with the substrate edges of the piezoelectric substrate, respectively and a pair of adjacent electrode fingers which are adjacent to the pair of the outermost electrode fingers, respectively. A distance D' from one of the substrate edges of the piezoelectric substrate to a center of the corresponding adjacent electrode fingers satisfies the following inequalities:
REFERENCES:
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patent: 5550793 (1996-08-01), Dufilie
patent: 5714830 (1998-02-01), Kadota et al.
patent: 5793147 (1998-08-01), Kadota et al.
patent: 5802685 (1998-09-01), Kadota et al.
patent: 5838217 (1998-11-01), Kadota et al.
Kadota Michio
Morii Haruo
Morozumi Kazuhiko
Budd Mark O.
Murata Manufacturing Co. Ltd.
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