Electromagnetic transducer

Details Electromagnetic transducer Electromagnetic transducer

1987-10-02

1989-04-11

Jordan, Charles T.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367182, 128 24A, 12866203, H04R 900

Patent

active

048212458

ABSTRACT:
An electromagnetic transducer for use in generating transient acoustic pulses in particular for medical purposes such as the destruction of kidney stones. The transducer comprises at least one pair of conductors, of which one is held against movement by a carrier having a high sonic impedance, whereas the other is displaceable with respect to the first to actuate an emitter for generating a pressure pulse as soon as both conductors are traversed by contradirectionally oriented currents so as to repel one another. The conductors of each pair are laid parallel to each other and so connected electrically that the portions adjacent to each other in each case of the cooperating first and second conductors can be traversed by the currents fed into the conductors contradirectionally to generate repulsive forces and equidirectionally to generate attractive forces.

REFERENCES:
patent: 2648837 (1953-08-01), Moance
patent: 2964730 (1960-12-01), Blanchard
patent: 3466017 (1969-09-01), Malvin
patent: 3560913 (1971-02-01), Copley
patent: 4593703 (1986-06-01), Cosman
patent: 4655220 (1987-04-01), Hahn et al.
patent: 4674505 (1987-06-01), Pauli et al.
patent: 4697581 (1987-10-01), Endo et al.

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