Apparatus for generating ultrasonic oscillation
First Claim
1. An apparatus for generating an ultrasonic oscillation comprising:
- an ultrasonic transducer having an ultrasonic vibrating element for producing an ultrasonic oscillation and a probe for transmitting the oscillation produced by the ultrasonic vibrating element;
a driving circuit for supplying a driving power to said ultrasonic vibrating element;
an impedance matching means connected between said ultrasonic transducer and said driving circuit for matching the output impedance of the driving circuit to the impedance of said ultrasonic transducer;
an impedance detecting means for detecting the impedance of said ultrasonic transducer to generate an impedance detection signal; and
controlling means for automatically controlling said impedance matching means in accordance with said impedance detection signal supplied from said impedance detecting means such that the output impedance of said driving circuit is matched to the impedance of said ultrasonic transducer.
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Accused Products
Abstract
The apparatus includes an ultrasonic transducer having a hand piece, an ultrasonic vibrating element secured to the hand piece and a probe coupled with the hand piece for propagating the ultrasonic oscillation produced by the ultrasonic vibrating element, a driving circuit for producing a driving signal for the ultrasonic vibrating element, a voltage controlled amplifier for amplifying the driving signal, an impedance matching transformer having a plurality of primary windings connected to the output of the voltage controlled amplifier via a switching circuit and a secondary winding connected to the ultrasonic vibrating element, a probe identification circuit for detecting the probe connected to the hand piece to produce a probe identification signal, a feedback control loop for generating a control voltage which is applied to the voltage controlled amplifier for controlling the amplification factor thereof in accordance with a driving current of the driving signal, an impedance detecting circuit for detecting the impedance of the ultrasonic transducer and controlling the switching circuit such that a given primary winding is connected to attain the impedance matching between the driving circuit and the ultrasonic transducer, and a voltage limiter arranged in the feedback control loop such that the maximum value of the control voltage is limited in accordance with the probe identification signal.
155 Citations
11 Claims
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1. An apparatus for generating an ultrasonic oscillation comprising:
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an ultrasonic transducer having an ultrasonic vibrating element for producing an ultrasonic oscillation and a probe for transmitting the oscillation produced by the ultrasonic vibrating element; a driving circuit for supplying a driving power to said ultrasonic vibrating element; an impedance matching means connected between said ultrasonic transducer and said driving circuit for matching the output impedance of the driving circuit to the impedance of said ultrasonic transducer; an impedance detecting means for detecting the impedance of said ultrasonic transducer to generate an impedance detection signal; and controlling means for automatically controlling said impedance matching means in accordance with said impedance detection signal supplied from said impedance detecting means such that the output impedance of said driving circuit is matched to the impedance of said ultrasonic transducer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for generating an ultrasonic oscillation, comprising:
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an ultrasonic transducer having an ultrasonic vibrating element for producing an ultrasonic oscillation and a probe for transmitting the oscillation produced by the ultrasonic vibrating element; a driving circuit for supplying a driving power to said ultrasonic vibrating element; an impedance matching means connected between said ultrasonic transducer and said driving circuit and including at least two matching transformer means for matching the output impedance of the driving circuit to the impedance of said ultrasonic transducer; and controlling means for automatically controlling said impedance matching means such that the output impedance of said driving circuit is matched to the impedance of said ultrasonic transducer. - View Dependent Claims (10, 11)
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Specification