Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1983-05-03
1985-01-01
Miller, J. D.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313C, 333154, 333196, H03H 925
Patent
active
044917570
ABSTRACT:
A surface wave device includes a substrate (12 in FIG. 7) having a surface layer of piezoelectric material (14), at least one pair of opposing electrically conducting pads (16 and 18) and at least two electrodes (20 and 22) which generate surface waves that vary significantly in strength in a direction transverse to the opposing pads. An ungrounded pad (16) forms an electrode array of parallel segmented electrodes (24), joined by electrically conducting connecting bars (26), having more segmented electrodes near the center of the transverse distance than near the pads. A grounded electrode (22) forms a segmented electrode array having segmented electrodes (44) joined by electrically conducting connecting bars (46) having fewer segmented electrodes near the center of the transverse distance than near the pads. In one arrangement, the pads and electrodes form an input transducer and the device includes an output transducer and a wave guide for guiding surface acoustic waves between the input transducer and the output transducer.
REFERENCES:
patent: 3551837 (1970-12-01), Speiser
patent: 3800248 (1974-03-01), Speiser
patent: 4143340 (1979-03-01), Hunsinger
patent: 4263571 (1981-04-01), Kinoshita et al.
Miller J. D.
R F Monolithics, Inc.
Rebsch D. L.
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