Selectable focus ultrasonic transducers for diagnostic imaging

Details Selectable focus ultrasonic transducers for diagnostic imaging Selectable focus ultrasonic transducers for diagnostic imaging

1984-01-13

1985-12-10

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

335153, G01N 2900

Patent

active

045571465

ABSTRACT:
Dual focus ultrasonic transducers are provided for a diagnostic imaging effective aspheric radiating surface. The transducers are formed of disc-shaped piezoelectric material. An annular groove separates the piezoelectric material into an inner disc region and an outer annular region for simultaneous activation or activation of the inner disc alone. The focus is changed by a reed switch connection to the two transducer regions, which permits proximity switch control of the transducer operation in a shielded environment for good noise performance.

REFERENCES:
patent: 3193198 (1965-07-01), Carlson
patent: 3587011 (1971-06-01), Kurz
patent: 3754208 (1973-08-01), Eilers
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patent: 3974475 (1976-08-01), Burckhardt et al.
patent: 4016751 (1977-04-01), Kossoff
patent: 4097835 (1978-06-01), Green
patent: 4138895 (1979-02-01), Mezrich

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