Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1980-12-18
1983-05-17
Shoop, William M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310335, 333195, H01L 4104
Patent
active
043842283
ABSTRACT:
An array of transducers is mounted on a base and means are provided for causing surface waves that emanate in opposite directions along the base to be reflected by transducers on either side so as to follow paths of respectively different lengths in going to the adjacent transducers and back to the transducer from which they emanated, the difference in path lengths being such that the surface waves return to the transducer from which they emanated out of phase with each other. The means can be comprised of grooves or spaces between pairs of transducers.
REFERENCES:
patent: 3596211 (1971-07-01), Dias et al.
patent: 3662293 (1972-05-01), De Vries
patent: 3859608 (1975-01-01), Hartmann et al.
patent: 4277712 (1981-07-01), Hanafy
Hewlett--Packard Company
Shoop William M.
Timbie Donald N.
Wong Peter S.
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