Ultrasonic motors and converters
First Claim
1. A driving circuit for driving an ultrasonic transducer having a piezoelectric element, said transducer being capable of vibration at a plurality of frequencies including a desired frequency, comprising:
- A. a power supply for producing a power signal;
B. a reference voltage;
C. a single transistor means having a conductive path coupled intermediate said power supply and a reference voltage and further having a control terminal, a control signal applied to said control terminal controlling the conductivity of said conductive path and therefore controlling the application of said power signal to said piezoelectric element as a driving signal, said conductive path of said transistor means being coupled to said power supply at a junction terminal;
D. transformer means having a primary winding and a secondary winding, said primary winding being electrically coupled intermediate said junction terminal and said piezoelectric element for detecting a detected signal representative at least of the frequency of said driving signal; and
E. tuned circuit means tuned to said desired frequency and formed from inductor means, and capacitor means connected in parallel with said inductor means, said transformer means secondary winding defining said inductor means, said tuned circuit means being operatively coupled between said transistor means control terminal and said reference voltage for applying a control signal to said control terminal for controlling the conductivity of said conductive path at said desired frequency in response to said detected signal to produce said driving signal at said desired frequency.
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Accused Products
Abstract
The invention discloses various embodiments of an ultrasonic motor and converter adapted to be used in home or industrial ultrasonic devices. The ultrasonic motor is generally of a piezoelectric material having a removable tip or of a design in which the complete motor is contained in a housing, which housing has electrical contact means adapted to be plugged into an adapter which, in turn, is connected to a converter. The motor is designed such that frequency sensing means is provided therein and the feedback signal is utilized by the converter to adjust itself thereto. The converter includes tuned circuit means tuned to a band including a desired frequency for sustaining the vibration of said motor at the desired frequency.
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Citations
38 Claims
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1. A driving circuit for driving an ultrasonic transducer having a piezoelectric element, said transducer being capable of vibration at a plurality of frequencies including a desired frequency, comprising:
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A. a power supply for producing a power signal; B. a reference voltage; C. a single transistor means having a conductive path coupled intermediate said power supply and a reference voltage and further having a control terminal, a control signal applied to said control terminal controlling the conductivity of said conductive path and therefore controlling the application of said power signal to said piezoelectric element as a driving signal, said conductive path of said transistor means being coupled to said power supply at a junction terminal; D. transformer means having a primary winding and a secondary winding, said primary winding being electrically coupled intermediate said junction terminal and said piezoelectric element for detecting a detected signal representative at least of the frequency of said driving signal; and E. tuned circuit means tuned to said desired frequency and formed from inductor means, and capacitor means connected in parallel with said inductor means, said transformer means secondary winding defining said inductor means, said tuned circuit means being operatively coupled between said transistor means control terminal and said reference voltage for applying a control signal to said control terminal for controlling the conductivity of said conductive path at said desired frequency in response to said detected signal to produce said driving signal at said desired frequency. - View Dependent Claims (2, 3, 4)
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5. An ultrasonic system, comprising:
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A. an ultrasonic motor having an output portion for transmission of high frequency mechanical vibrations said motor being capable of vibration at a plurality of frequencies, including a desired frequency; B. driving circuit means operatively coupled to said ultrasonic motor for applying thereto a driving signal of said desired frequency for sustaining the vibration of said motor at said frequency, said driving circuit means including; 1. a power supply for producing a power signal; 2. a reference voltage; 3. a single transistor means having a conductive path coupled intermediate said power supply and a reference voltage and further having a control terminal, a control signal applied to said control terminal controlling the conductivity of said conductive path and therefore controlling the application of said power signal to said ultrasonic motor as said driving signal, said conductive path of said transistor means being coupled to said power supply at a junction terminal; C. transformer means having a primary winding and a secondary winding, said primary winding being electrically coupled intermediate said junction terminal and said ultrasonic motor for detecting a detected signal representative at least of the frequency of said driving signal; and D. tuned circuit means tuned to said desired frequency and formed from inductor means, and capacitor means connected in parallel with said inductor means, said transformer means secondary winding defining said inductor means, said tuned circuit means being operatively coupled between said transistor means control terminal and said reference voltage for applying a control signal to said control terminal for controlling the conductivity of said conductive path at said desired frequency in response to said detected signal to produce said driving signal of said desired frequency. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An ultrasonic system, comprising:
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A. an ultrasonic motor having an output portion for transmission of high frequency mechanical vibrations, said motor being capable of vibration at a plurality of frequencies including a desired frequency; and B. driving circuit means operatively coupled to said ultrasonic motor for applying thereto a driving signal of said desired frequency for sustaining the vibration of said motor at said frequency, said driving circuit means including; 1. transistor amplifier circuit means for producing said driving signal having an input and an output; 2. a load circuit operatively coupled to said amplifier circuit means output, said load circuit being free of a tuned circuit and including said ultrasonic motor for the application of said driving signal to said ultrasonic motor; 3. tuned circuit means tuned to said desired frequency for defining a filter means and coupled to said amplifier circuit means input; and 4. sensing means mechanically coupled to said ultrasonic motor for detecting the frequencies of vibration thereof and producing a detected signal representative of the frequencies of vibration of said ultrasonic motor and electrically coupled to said tuned circuit means for applying said detected signal thereto, said tuned circuit means passing only the desired frequency portion of said detected signal to said amplifier circuit means input, said amplifier circuit means amplifying said filtered signal to produce a driving signal of said desired frequency. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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34. A driving circuit for driving an ultrasonic transducer having a piezoelectric element, said transducer being capable of vibration at a plurality of frequencies including a desired frequency comprising:
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A. sensing means mechanically coupled to said ultrasonic transducer for detecting the frequencies of vibration thereof and producing a detected signal representative of said frequencies of vibration; B. transistor amplifier means having an input and an output; C. tuned circuit means tuned to said desired frequency and electrically connected intermediate said sensing means and said amplifier means input, said tuned circuit means being adapted to filter said detected signal and pass to said amplifier means input the component of said detected signal of said desired frequency; and D. load circuit means free of a tuned circuit operatively connecting said amplifier means output and said piezoelectric element for applying a driving signal to said piezoelectric element of said desired frequency. - View Dependent Claims (35, 36)
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37. A driving circuit for driving an ultrasonic transducer having a piezoelectric element, said transducer being capable of vibration at a plurality of frequencies including a desired frequency comprising:
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A. sensing means mechanically coupled to said ultrasonic transducer for detecting the frequencies of vibration thereof and producing a detected signal representative of said frequencies of vibration; B. amplifier means including a transistor means having a conductive path and a control terminal, the signal applied to said control terminal being amplified in said conductive path; C. tuned circuit means tuned to said desired frequency and electrically connected intermediate said sensing means and said transistor means control terminal, said tuned circuit means being adapted to filter said detected signal and pass to said transistor means control terminal the component of the detected signal of said desired frequency for amplification by said transistor means; D. a power supply; and E. load circuit means free of a tuned circuit operatively connecting said transistor means conductive path and said piezoelectric element for applying a driving signal to said piezoelectric element of said desired frequency, said load circuit means including a transformer having a primary winding connected in series with said power supply and said transistor means conductive path and a secondary winding electrically connected to said piezoelectric element, whereby the amplified component of said detected signal of said desired frequency is applied as a driving signal to said piezoelectric element.
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38. An ultrasonic system, comprising:
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A. an ultrasonic motor having an output portion for transmission of high frequency mechanical vibrations, said motor being capable of vibration at a plurality of frequencies including a desired frequency; and B. driving circuit means operatively coupled to said ultrasonic motor for applying thereto a driving signal of said desired frequency for sustaining the vibration of said motor at said frequency, said driving circuit means including; 1. amplifier circuit means having a transistor means including a conductive path and a control electrode; 2. sensing means mechanically coupled to said ultrasonic motor for detecting the frequencies of vibration thereof and producing a detected signal representative of the frequencies of vibration of said ultrasonic motor; 3. tuned circuit means tuned to said desired frequency and electrically connected intermediate said sensing means and said transistor means control electrode, said tuned circuit means being adapted to filter said detected signal and pass to said transistor means control electrode the component of said detected signal of said desired frequency, said transistor means amplifying said detected signal, the amplified detected signal appearing in said conductive path; 4. a power supply for supplying a power signal; and 5. load circuit means free of a tuned circuit operatively connecting said transistor means conductive path, power supply, and said ultrasonic motor including a transformer having a primary winding electrically connected in series with said power supply and said transistor means conductive path and a secondary winding electrically connected to said ultrasonic motor, whereby said motor is driven by said amplified detected signal.
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Specification