Multi-focus spiral ultrasonic transducer

Details Multi-focus spiral ultrasonic transducer Multi-focus spiral ultrasonic transducer

1981-11-30

1983-08-30

Miller, J. D.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

73642, 128660, 310334, 350296, H03J 328

Patent

active

044019106

ABSTRACT:
An ultrasonic transducer providing a plurality of different focal lengths within a unitary structure and comprising a piezoelectric element having a cylindrical spiral surface with respective sections of the spiral surface providing respective different focal lengths. Each section of the spiral surface can include electrodes in the form of a Fresnel zone pattern to provide focusing in the orthogonal dimension to the spiral axis.

REFERENCES:
patent: 3390399 (1968-06-01), Leonard
patent: 3924453 (1975-12-01), Clark et al.
patent: 4230094 (1980-10-01), Szulmayer
patent: 4296349 (1981-10-01), Nakanishi et al.
patent: 4319490 (1982-03-01), Hartmann, Jr.
patent: 4350917 (1982-09-01), Lizzi et al.

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