Driving control method of ultrasonic transducer
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United States of America Patent
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Jan 13, 1987
Issued Date -
N/A
app pub date -
Feb 18, 1986
filing date -
Aug 5, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In an ultrasonic transducer, frequency characteristics of phase detecting signal and frequency characteristics of transducer drive current are searched, 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 PLL follow oscillation is performed. In such constitution, 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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