Driving control method of ultrasonic transducer
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United States of America Patent
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-
Mar 25, 1986
Grant Date -
N/A
app pub date -
Aug 1, 1984
filing date -
Aug 5, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an ultrasonic transducer, frequency characteristics of phase detecting signal and frequency characteristics of transducer drive current are searched, the resonant point with current dipping is found on the characteristics, the zero cross point corresponding to the current dipping is decided as the fundamental resonant point, and then a PLL following oscillation operation is performed. Under such condition even if there exist many sub resonant frequency points near the fundamental resonant frequency, the PLL follow oscillation can be performed stably.
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