Driving frequency controlling method for an ultrasonic transducer driving apparatus
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United States of America Patent
Stats
-
Dec 31, 1985
Grant Date -
N/A
app pub date -
Jun 13, 1983
filing date -
Jul 21, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method for flating the phase characteristic of a differential detection signal in one higher and lower regions thereof relative to its resonance frequency by controlling a differential characteristic. A searching, over a range, which is wider than the width of the flat region, is accomplished prior to phase characteristic being effected thereby discriminating a fundamental resonance frequency. After this discrimination of the fundamental resonance frequency, automatic tracking is effected under stable corrected phase characteristics for the fundamental resonant frequency whereby high electro-mechanical conversion efficiency can be maintained.
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