Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-12-22
1980-06-03
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
333194, 333196, H01L 4110
Patent
active
042063809
ABSTRACT:
A surface acoustic wave device has an electrode finger structure in which the width of finger portions external of envelopes indicating a weighted overlap length and the length of the spaces existing between adjacent finger portions measured widthwise thereof are substantially equal to one half of the wavelength of the acoustic surface wave, the envelopes are symmetric about the center line of a propagation path for the surface acoustic wave, and the finger portions and the spaces between the finger portions are in opposite positional relation to each other about the center line of the propagation path. With this electrode finger structure, occurrence of disturbing reflected signal at the weighted interdigital electrode, which is used as an input/output electrode of the surface acoustic wave device and occurrence of wavefront distortion are prevented and production yield of the device is improved.
REFERENCES:
patent: 3727155 (1973-04-01), DeVries
patent: 3801937 (1974-04-01), Bristol
patent: 3968461 (1976-07-01), Mitchell et al.
patent: 4023124 (1977-05-01), Parker et al.
patent: 4126838 (1978-11-01), McCusker et al.
Hanma Kentaro
Hazama Katashi
Budd Mark O.
Hitachi , Ltd.
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