Piezoelectric device with reduced negative waves, and use of sai

Details Piezoelectric device with reduced negative waves, and use of sai Piezoelectric device with reduced negative waves, and use of sai

1989-12-01

1991-05-14

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, H01L 4108

Patent

active

050159291

ABSTRACT:
The invention relates to a device generating ultrasonic waves focused in a ocal point. Said generator device comprises a plurality of transducer elements arranged externally on a support means for focusing into a focal point, such as a circular dome, and is characterized in that the transducer elements are divided into at least two groups of transducer elements, of which the resonance frequency differs in such a way that the principal positive ultrasonic waves produced by each group add up together and the positive and negative secondary ultrasonic waves are at least partly cancelled, thus reducing significantly the negative waves. This device can be advantageously used for extracorporeal lithotripsy.

REFERENCES:
patent: 2169304 (1939-08-01), Tournier
patent: 3656012 (1972-04-01), Dixon
patent: 3879698 (1975-04-01), Pepper
patent: 3939467 (1976-02-01), Cook et al.
patent: 4350917 (1982-09-01), Lizzi et al.
patent: 4395652 (1983-07-01), Nakanishi
patent: 4401910 (1983-08-01), Beerman
patent: 4439847 (1984-03-01), Massa
patent: 4445207 (1984-04-01), Sternberg
patent: 4576048 (1986-03-01), Glenn
patent: 4582065 (1986-04-01), Adams
patent: 4639904 (1987-01-01), Riedlinger
patent: 4670683 (1987-06-01), Hoen
patent: 4865042 (1989-09-01), Umemura et al.
patent: 4890268 (1989-12-01), Smith et al.

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