JPH02280876A - Method for driving ultrasonic vibrator - Google Patents

Abstract

PURPOSE:To dispense with a matching coil or a matching condenser and to enhance the conversion efficiency of an ultrasonic vibrator by connecting an electrostriction type ultrasonic vibrator and a magnetostriction type ultrasonic vibrator in series and driving an oscillator. CONSTITUTION:An electrostriction type ultrasonic vibrator 1 and a magnetostriction type ultrasonic vibrator 7 are connected in series and an oscillator 2 is driven. The electrostriction type ultrasonic vibrator 1 is capacitive and the magnetostriction type ultrasonic vibrator 7 is inductive and, therefore, by connecting both vibrators 1, 7 in series, an object can be resonated by the capacitance of the electrostriction type ultrasonic vibrator 1 and the inductance of the magnetostriction type ultrasonic vibrator 7. That is, the frequency of the aforementioned resonance is set to the same value as the resonance frequency of both ultrasonic vibrators 1, 7 to make it possible to achieve the improvement of a power factor and the matching of impedance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for driving an ultrasonic vibrator used in an ultrasonic cleaning device or the like.

[Prior Art] Fig. 3 is a principle diagram explaining the conventional method of driving an ultrasonic transducer, in which (a) is a diagram explaining the method of driving an electrostrictive ultrasonic transducer, and (b) is a diagram explaining the method of driving an electrostrictive ultrasonic transducer. FIG. 3 is a diagram illustrating a method of driving a type ultrasonic transducer.

(1) Driving method of electrostrictive ultrasonic vibrator The electrostrictive ultrasonic vibrator 1 uses a piezoelectric element, and the oscillator 2
It is a transducer that converts the drive power of a motor into mechanical vibration, and is electrically capacitive.

On the other hand, in order to efficiently supply driving power to the oscillator 2,
A matching coil 3 is provided in the ultrasonic drive device 4a, connected in series between the oscillator 2 and the electrostrictive ultrasonic vibrator 1, and resonated with the capacitance of the electrostrictive ultrasonic vibrator 1. This is aimed at improving the power factor and matching impedance.

Incidentally, FIG. 3(a) shows an example of an ultrasonic cleaning apparatus in which an electrostrictive ultrasonic vibrator 1 is attached to a cleaning tank 5 containing a cleaning liquid 6.

(2) Driving method of magnetostrictive ultrasonic transducer The magnetostrictive ultrasonic transducer 7 uses a magnetostrictive element, and the oscillator 2
It is a transducer that converts the drive power of the magnetostrictive element into mechanical vibration, and uses a coil to apply a magnetic field to the magnetostrictive element.

Therefore, it is electrically inductive.

On the other hand, in order to efficiently supply driving power to the oscillator 2,
A matching capacitance 8 is provided in the ultrasonic drive device 4b, connected in series between the oscillator 2 and the magnetostrictive ultrasonic vibrator 7, and resonated with the inductance of the magnetostrictive ultrasonic vibrator 7. The aim is to improve the power factor and match impedance.

Incidentally, FIG. 3(b) shows an example of an ultrasonic cleaning apparatus in which a magnetostrictive ultrasonic vibrator 7 is attached to a cleaning tank 5 containing a cleaning liquid 6.

(3) Sharing of electrostrictive ultrasonic transducers and magnetostrictive ultrasonic transducers Figure 4 is a principle diagram illustrating an example of common use of conventional electrostrictive ultrasonic transducers and magnetostrictive ultrasonic transducers. .

The electrostrictive ultrasonic vibrator 1 and the magnetostrictive ultrasonic vibrator 7 are attached to one device, for example, one cleaning tank 5, and
When driving the double-sided sonic transducer 1.7, the electrostrictive ultrasonic transducer 1 is driven by the ultrasonic driving device 4a having the matching coil 3, and the ultrasonic driving device 4b having the matching capacitor 8.
The magnetostrictive ultrasonic transducer 7 is driven separately.

[Problem to be solved by the invention]

The biggest problem with conventional driving methods is that the electrostrictive ultrasonic transducer 1 requires a matching coil 3, and the magnetostrictive ultrasonic transducer 7 requires a matching capacitor 8.

In particular, in the electrostrictive ultrasonic transducer 1, the copper loss, hysteresis loss, eddy current loss, etc. of the matching coil 3 are quite large, and become an excessive heat source.

Therefore, not only does efficiency decrease by the amount of heat generated,
This causes the ultrasonic drive device 4a to heat up, making the operating environment of the electronic circuit of the ultrasonic drive device 4a poor.

Furthermore, the size and weight of the matching coil 3 are large, which is a factor that prevents the ultrasonic driving device 4a from being made smaller and lighter.

Therefore, the matching coil 3 is sometimes placed separately outside the ultrasonic driving device 4a.

On the other hand, even in the magnetostrictive ultrasonic transducer 7, the matching capacitor 8
Although it generates almost no heat, it is a factor that prevents miniaturization of the ultrasonic driving device 4b.

The technical problem of the present invention is to solve the above-mentioned problems in the conventional method of driving an ultrasonic transducer, and to establish a driving method that does not require a matching coil or a matching capacitor. The object of the present invention is to improve the conversion efficiency of the ultrasonic drive device, reduce the amount of heat generated by the ultrasonic drive device, and realize a small, lightweight, highly reliable ultrasonic drive device at low cost.

[Means to solve the problem]

FIG. 1 is a diagram explaining the basic principle of the present invention, (a) is a diagram when an electrostrictive ultrasonic transducer and a magnetostrictive ultrasonic transducer are installed in the same device, and (b) is an illustration of an electrostrictive ultrasonic transducer and a magnetostrictive ultrasonic transducer installed in the same device. FIG. 3 is a diagram showing a case where a strain type ultrasonic transducer and a magnetostrictive type ultrasonic transducer are attached to separate devices.

The present invention is characterized in that an electrostrictive ultrasonic transducer and a magnetostrictive ultrasonic transducer are used together and in series connection.

That is, an electrostrictive ultrasonic vibrator l and a magnetostrictive ultrasonic vibrator 7 are connected in series and driven by an oscillator 2, and the magnetostrictive ultrasonic vibrator is used instead of the matching coil of the electrostrictive ultrasonic vibrator l. Child 7
This is a driving method in which the electrostrictive ultrasonic vibrator 1 is used in place of the matching capacitor of the magnetostrictive ultrasonic vibrator 7, and the matching coil and matching capacitor are not used.

In this case, the electrostrictive ultrasonic transducer 1 and the magnetostrictive ultrasonic transducer 7 may be separately attached to different devices, for example, the cleaning tank 5a and the cleaning tank 5b.

[Effect]

The electrostrictive ultrasonic transducer 1 is capacitive. On the other hand, the magnetostrictive ultrasonic transducer 7 is inductive.

Therefore, by connecting both the transducers 1.7 in series, the capacitance of the electrostrictive ultrasonic transducer 1 and the inductance of the magnetostrictive ultrasonic transducer 7 can resonate.

That is, the frequency of the resonance is set by the recurrent acoustic wave transducer 1,
By setting the value to be the same as the resonance frequency of No. 7, power factor improvement and impedance matching can be achieved.

Therefore, there is no need to provide a matching coil or capacitor between the oscillator 2 and the recurrent sound wave transducer 1.7.

〔Example〕

FIG. 2 is a block diagram illustrating the embodiment.

The oscillation output of the oscillation circuit 9 is amplified to a predetermined power by a power amplification circuit 10, and the driving power is supplied to the ultrasonic transducer via an output transformer 11.

On the other hand, the ultrasonic transducer has an electrostrictive ultrasonic transducer 12 and a magnetostrictive ultrasonic transducer 13 connected in series, and an output transformer 1.
Connect to 1.

Now, the resonance frequency of the electrostrictive ultrasonic transducer 12 is set to 28°2.
KHz, and the capacitance is 4000PF, the electrical resonance frequency can be adjusted by winding a coil around a magnetostrictive element with a resonance frequency of 28.2KHz so that the inductance is approximately 811IH, and performing power factor correction and impedance matching. Optimal.

Of course, the oscillation frequency of the oscillation circuit 9 is also set to the above-mentioned electrical resonance frequency.

〔Effect of the invention〕

As described above, according to the driving method described in this explanation, the electrostrictive ultrasonic transducer and the magnetostrictive ultrasonic transducer are connected in series and driven by an oscillator, thereby eliminating the need for a matching coil or a matching capacitor. Become.

Therefore, the conversion efficiency of the ultrasonic transducer is improved, and the amount of heat generated by the ultrasonic drive device is also extremely small, making it possible to reduce the size and weight of the device.

As a result, a highly efficient and reliable ultrasonic driving device can be realized at low cost.

[Brief explanation of drawings]

FIG. 1 is a diagram explaining the basic principle of the present invention, (a> is a diagram when an electrostrictive ultrasonic transducer and a magnetostrictive ultrasonic transducer are installed in the same device, and (b) A diagram showing the case where a strain type ultrasonic transducer and a magnetostrictive type ultrasonic transducer are installed in separate devices. Fig. 2 is a block diagram explaining the embodiment. Fig. 3 is a diagram showing the drive of a conventional ultrasonic transducer. In the principle diagram explaining the method, (a
) is a diagram explaining the driving method of an electrostrictive ultrasonic transducer, (b
) is a diagram explaining a method of driving a magnetostrictive ultrasonic transducer, and FIG. 4 is a principle diagram explaining an example of common use of a conventional electrostrictive ultrasonic transducer and a magnetostrictive ultrasonic transducer. In the figure, 1 is an electrostrictive ultrasonic transducer, 2 is an oscillator, and 3
is a matching coil, 4a and 4b are ultrasonic drive devices, 5.5
a and 5b are cleaning tanks, 6a and 6b are cleaning liquids, 7 is a magnetostrictive ultrasonic transducer, 8 is a matching capacitor, 9 is an oscillation circuit, 10 is a power amplifier circuit, 11 is an output transformer, and 12 is a An electrostrictive ultrasonic transducer is shown, and 13 is a magnetostrictive ultrasonic transducer. Patent applicant: Yasushi Fukushima, Patent attorney, Sun Denshi Co., Ltd. Patent attorney Yasushi Fukushima Case No. 2t21 The 11 power methods of Muco's inconspicuous ultrasonic wave I-5 are shown in Figure 3. Conventional electrostrictive type ultrasonic wave. Qin 3 Otomagi Meng type Super Zeng Shujaku moving child ω length 4 ke 1 No. 40 Procedural amendment ■. Indication of the case Patent application Hei 1-100989 2゜Name of the invention Ultrasonic transducer driving method 5゜Date of amendment order (voluntary) 6゜All drawings subject to amendment

Claims (1)

[Claims] Electrostrictive ultrasonic transducer (1) and magnetostrictive ultrasonic transducer (7)
are connected in series and driven by an oscillator (2), and a magnetostrictive ultrasonic vibrator (7) is used instead of the matching coil of the electrostrictive ultrasonic vibrator (1). A method for driving an ultrasonic transducer, characterized in that an electrostrictive ultrasonic transducer (1) is used instead of the matching capacitor of (7), and a matching coil and a matching capacitor are not used.