Selectable focus ultrasonic transducers for diagnostic imaging
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United States of America Patent
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Dec 10, 1985
Issued Date -
N/A
app pub date -
Jan 13, 1984
filing date -
Jul 21, 1982
priority date (Note) -
Expired
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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.
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