Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-12-18
1994-08-09
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313C, 310313B, 364821, H01L 4108
Patent
active
053369572
ABSTRACT:
A surface acoustic wave convolver includes first and second interdigital electrodes for exciting surface acoustic waves and an output electrode for detecting the surface acoustic waves to extract a convolution output as an electrical signal, the first and second interdigital electrodes and the output electrode being formed on a piezoelectric or electrostrictive substrate. In order to improve convolution efficiency and obtain wide-range characteristics, each of the first and second interdigital electrodes has a predetermined thickness, the first interdigital electrode is arranged such that positive and negative electrodes are alternately arranged so as to have electrode widths and periods which are gradually decreased toward the output electrode, the second interdigital electrode is arranged such that positive and negative electrodes are alternately arranged so as to have electrode widths and periods which are gradually increased toward the output electrode, and the second interdigital electrode has a double electrode structure in addition, in order to reduce ripples in frequency characteristics, the output electrode are divided into a plurality of pieces, and two end portion of each of the first and second interdigital electrodes are weighted.
REFERENCES:
patent: 4473888 (1984-09-01), Smith et al.
IEEE Transactions on Microwave Theory and Techniques, vol. MTT20, No. 2, Feb. 1972, New York US pp. 188-192.
IEE Proceedings A. Physical Science, Measurement & Instrumentation, Management & Education, vol. 131, No. 4, Jun. 1984, Stevenage GB pp. 186-215.
Kato Shunji
Mihota Norihito
Ogata Jun-ichi
Terada Hiromu
Yamanouchi Kazuhiko
Budd Mark O.
Mitsui Mining & Smelting Co. Ltd.
Yamanouchi Kazuhiko
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