KR101095259B1 - Apparatus and method for driving of piezoelectric ultrasonicmotor - Google Patents

Abstract

The present invention relates to a driving device and a driving method of a piezoelectric ultrasonic vibration device, wherein the driving device of the piezoelectric ultrasonic vibration device includes a piezoelectric ultrasonic vibration device in which a driving waveform is applied to a piezoelectric element, and a driving waveform for generating the driving waveform. And a generating unit, a driving waveform adjusting unit for adjusting the driving waveform, a driving control unit for generating and controlling a driving signal according to the driving waveform, and a driving unit driven by the generated driving signal. By controlling the driving speed of the ultrasonic vibrating element, the control precision of the camera lens feed speed is improved and noise can be reduced accordingly.

Piezoelectric Element, Piezo Motor, Ultrasonic, Driving Speed Control, Waveform Control

Description

Apparatus and method for driving piezoelectric ultrasonic vibration device {APPARATUS AND METHOD FOR DRIVING OF PIEZOELECTRIC ULTRASONICMOTOR}

The present invention relates to a driving apparatus and a driving method of a piezoelectric ultrasonic vibration element.

Currently, portable terminals such as mobile phones and PDAs have been recently used with multi-convergence with music, movies, TVs, games, etc. as well as simple telephone functions with the development of the technology. Accordingly, the demand for a camera module which is essentially used for the multi-convergence function of the portable terminal is increasing.

 In general, the camera module includes a lens transfer device for transferring the lens in the optical axis direction. The lens transfer apparatus uses an actuator such as an electromagnetic motor, a piezoelectric vibrator, and the like as the power generating means required for lens transfer.

Recently, an ultrasonic motor using a piezoelectric vibrating element having a higher resolution, less noise, and less noise than an electromagnetic motor has attracted attention.

A conventional piezoelectric ultrasonic motor according to the prior art is composed of a piezoelectric vibrating element and a friction member attached to one side of the piezoelectric vibrating element.

The piezoelectric ultrasonic motor generates high-frequency vibrations with a small amplitude in the piezoelectric vibrating element, and transmits the fine vibration through contact friction between the friction member attached to the piezoelectric vibrating element and the slider (or the rotor), whereby the fineness of the slider (or the rotor) is obtained. Enable exercise

Specifically, when power is applied to the piezoelectric ultrasonic motor, the piezoelectric vibrating element may be flexibly deformed in the thickness direction of the piezoelectric vibrating element and the elastic vibration mode of stretching and deforming along the length direction of the piezoelectric vibrating element. The vibration of the flexure vibration mode occurs.

While these two modes of vibration occur at the same time, elliptic motion occurs in the friction member. The elliptical motion of the friction member is transmitted to the slider or the rotor to enable the linear motion of the slider or the rotational motion of the rotor.

Particularly, in the camera module, the elliptic motion generated from the piezoelectric ultrasonic motor is transmitted to the lens transport apparatus for lens transport to perform a linear motion for transporting the lens in the optical axis direction.

As a result, a zooming function or a focusing function is realized by changing the relative distance between the lens and the adjacent lens.

However, when the camera module equipped with the piezoelectric ultrasonic motor is commercialized, even if the same driving voltage (or driving current) is applied to the piezoelectric ultrasonic motor, the driving speed is not constant for each product.

Accordingly, there is a need for a driving apparatus and method for driving a piezoelectric ultrasonic motor that have the same product specification in a product using the same camera module.

The present invention devised to solve the above problems, provides a driving device and a method of driving a piezoelectric ultrasonic vibration device for controlling the driving speed of the piezoelectric ultrasonic vibration device by adjusting the driving waveform applied to the piezoelectric ultrasonic vibration device. It aims to do it.

According to an aspect of the present invention, there is provided a driving apparatus of a piezoelectric ultrasonic vibration device, the piezoelectric ultrasonic vibration device of which the piezoelectric material is deformed and driven when a driving waveform is applied to a piezoelectric body; A drive waveform generator for generating a drive waveform for driving the piezoelectric ultrasonic vibration device; A drive waveform control unit for adjusting the drive waveform to control the drive speed of the piezoelectric ultrasonic vibration device; A driving control unit generating a driving signal generated by the driving waveform generating unit and a driving signal adjusted by the driving waveform adjusting unit to control driving of the piezoelectric ultrasonic vibration device; And a driving unit supplying the generated driving signal to the piezoelectric ultrasonic vibration device to drive the piezoelectric ultrasonic vibration device at a driving speed of the driving signal.

In addition, the driving apparatus of the piezoelectric ultrasonic vibration device according to the present embodiment is further characterized in that it further comprises a frequency generator for generating a pulse having a frequency required for driving the piezoelectric element is connected to the drive waveform generator.

In addition, the drive waveform control unit, the power control circuit for adjusting the size and pulse width of the drive waveform; And a pulse generating circuit for adjusting the duty ratio and driving frequency of the driving waveform.

The driving waveform may include at least one of a driving voltage waveform, a driving current waveform, and a driving frequency waveform.

On the other hand, the driving method of the piezoelectric ultrasonic vibration device according to an embodiment of the present invention, (A) generates a drive waveform for driving the piezoelectric ultrasonic vibration device, generates a drive signal according to the drive waveform and the drive signal Driving the piezoelectric ultrasonic vibration device; And (B) determining whether the drive speed control request signal of the piezoelectric ultrasonic vibration device is determined, adjusting the drive waveform when the drive speed control request signal is present, and generating a drive signal according to the adjusted drive waveform. Driving the piezoelectric ultrasonic vibration device with a signal.

In addition, the driving method of the piezoelectric ultrasonic vibration device according to an embodiment of the present invention, after step (B), (C) a signal for terminating the driving of the ultrasonic vibration device, if the drive speed adjustment request signal is not input; The method may further include terminating or continuing the driving of the ultrasonic vibration device by determining whether the input signal is input.

The driving waveform may include at least one of a driving voltage waveform, a driving current waveform, and a driving frequency waveform.

In addition, the step (A), (A-1) generating a drive waveform for driving the piezoelectric ultrasonic vibration element; (A-2) generating a driving signal according to the driving waveform; And (A-3) driving the piezoelectric ultrasonic vibration device at a driving speed of the driving signal.

In addition, the step (B), (B-1) determining whether the drive speed control request signal of the piezoelectric ultrasonic vibration device; (B-2) adjusting the at least one of magnitude, pulse width, duty ratio, and driving frequency waveform of the driving waveform to control the driving speed of the piezoelectric ultrasonic vibration device when the driving speed adjustment request signal is present; ; (B-3) generating a driving signal according to the adjusted driving waveform; And (B-4) driving the piezoelectric ultrasonic vibration device at a driving speed of the driving signal.

In addition, in the step (B-2), when the driving speed adjustment request signal is present, the driving waveform is adjusted by turning on or off an output voltage to control the driving speed of the piezoelectric ultrasonic vibration device.

According to the present invention, by controlling the driving speed of the piezoelectric ultrasonic vibration element by adjusting the voltage and current waveform applied to the piezoelectric ultrasonic vibration element, the control precision of the camera lens feed rate is improved, and thus the noise when moving the lens can be reduced. It works.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. In the present specification, in adding reference numerals to the components of the drawings, it should be noted that the same number. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a driving apparatus of a piezoelectric ultrasonic vibration device according to an embodiment of the present invention.

Referring to FIG. 1, a piezoelectric ultrasonic vibration device driving apparatus 100 according to an embodiment of the present invention may include a piezoelectric ultrasonic vibration device 110, a driving waveform generator 120, a frequency generator 130, and a driving waveform. It is configured to include an adjusting unit 140, the drive control unit 150 and the drive unit 160.

The piezoelectric ultrasonic vibration device 110 includes a piezoelectric body, one ground electrode GND connected to one end of the piezoelectric body, and at least one driving electrode connected to the other end of the piezoelectric body, and the ground electrode GND and the at least one or more electrodes. When a driving waveform (for example, a driving voltage waveform or a driving current waveform) is applied between driving electrodes, the piezoelectric element is deformed to provide driving force.

Specifically, when the piezoelectric ultrasonic vibration element 110 is used in the lens transfer device of the camera module, when a driving voltage or a driving current having a predetermined driving frequency is applied to the piezoelectric body, the surface of the piezoelectric body performs an elliptic motion, The lens is linearly moved by the elliptic motion of the piezoelectric vibrating element 110.

The driving waveform generator 120 generates a waveform for driving the piezoelectric ultrasonic vibration device 110.

Specifically, the piezoelectric body of the piezoelectric ultrasonic vibration device 110 is driven by a voltage waveform or a current waveform having a predetermined driving frequency. Accordingly, the driving waveform generator 120 generates a driving voltage waveform or a driving current waveform having an optimum driving frequency corresponding to the piezoelectric body of the piezoelectric ultrasonic vibration device 110.

Here, in order to obtain a driving frequency necessary for driving the piezoelectric ultrasonic vibration device 110, the driving waveform generator 120 may be connected to the frequency generator 130.

The frequency generator 130 generates a pulse having a predetermined frequency required for driving the piezoelectric body. Accordingly, the driving waveform generator 120 connected to the frequency generator 130 may generate a driving voltage waveform or a driving current waveform having a predetermined driving frequency by using a pulse having a driving frequency.

The driving waveform control unit 140 controls the driving speed of the piezoelectric ultrasonic vibration device 110 by adjusting the driving voltage waveform, the driving current waveform, and the driving frequency waveform for driving the piezoelectric body of the piezoelectric ultrasonic vibration device 110. It includes a power control circuit and a pulse generating circuit.

For example, the driving waveform adjusting unit 140 adjusts the size and pulse width of the driving voltage waveform or the driving current waveform for driving the piezoelectric body of the piezoelectric ultrasonic vibration device 110 through the power control circuit. The driving speed of the piezoelectric ultrasonic vibration device 110 is controlled.

In addition, the driving waveform control unit 140 adjusts the duty ratio and driving frequency of the driving voltage waveform or the driving current waveform for driving the piezoelectric body of the piezoelectric ultrasonic vibration device 110 through the pulse generating circuit. The driving speed of the vibrating element 110 is controlled.

In detail, the driving frequency is a driving frequency (hereinafter, referred to as a 'variation frequency') that may fluctuate within an optimal driving frequency (hereinafter referred to as an 'optimum frequency') region and a frequency region adjacent to the optimal frequency satisfying a set driving condition. The piezoelectric ultrasonic vibration device 110 by periodically using the optimum frequency region and the variable frequency region or adjusting the ratio of the optimum frequency region and the variable frequency region through the pulse generating circuit. Drive speed can be controlled.

A method of controlling the driving speed of the piezoelectric ultrasonic vibration device 110 by adjusting the driving voltage waveform, the driving current waveform, and the driving frequency waveform will be described in more detail below with reference to FIGS. 3A to 7.

The driving controller 150 generates a driving signal according to the driving voltage waveform or the driving current waveform generated from the driving waveform generator 120 and transmits the driving signal to the driving unit 160.

The driving controller 150 determines whether the driving speed control request signal RS of the piezoelectric ultrasonic vibration device 110 is input, and when the driving speed control request signal RS is input, adjusts the driving waveform. Transfer to the unit 140.

In addition, the driving controller 150 generates a driving signal according to the waveform adjusted from the driving waveform adjusting unit 140 and transfers the driving signal to the driving unit 160.

In addition, the driving controller 150 determines whether a signal for terminating the driving of the piezoelectric ultrasonic vibrating element 110 is input while the piezoelectric ultrasonic vibrating element 110 is driven according to the driving signal. Decide

The driving unit 160 drives or stops driving the piezoelectric ultrasonic vibration device 110 at a driving speed according to the driving signal generated by the driving control unit 150.

2 is a diagram illustrating an example of a driving voltage waveform having a predetermined driving frequency.

2, in the driving voltage waveform, pulses having a constant magnitude, pulse width, and duty ratio according to a predetermined frequency generated by the driving waveform generator 120 are regularly generated.

When the driving voltage waveform is applied to the piezoelectric body of the piezoelectric ultrasonic vibration device 110, the piezoelectric ultrasonic vibration device 110 may have a predetermined driving speed.

Similarly, although not shown, pulses having a constant magnitude, pulse width, and duty ratio according to a predetermined frequency generated by the driving current waveforms are generated regularly, and the driving current waveforms of the piezoelectric ultrasonic vibration device 110 are generated. When applied to a piezoelectric body, the piezoelectric ultrasonic vibration device 110 has a predetermined driving speed.

Hereinafter, a method of controlling the driving speed of the piezoelectric ultrasonic vibration device 110 by adjusting the driving voltage waveform, the driving current waveform, or the driving frequency waveform as described above will be described in detail.

3A and 3B are diagrams for describing a method using driving current waveform control to control the driving speed of the piezoelectric ultrasonic vibration device 110.

In more detail, FIG. 3A is a driving current waveform without limitation generated by the driving waveform generator 120, and FIG. 3B is a driving current waveform when current is limited by reducing the magnitude of the driving current of FIG. to be.

When the driving current waveform as shown in FIG. 3A is applied to the piezoelectric body of the piezoelectric ultrasonic vibration device 110, the piezoelectric ultrasonic vibration device 110 has a predetermined driving speed.

As shown in FIG. 3B, when the magnitude of the driving current waveform of FIG. 3A is reduced, the driving speed of the piezoelectric ultrasonic vibration device 110 may be reduced. On the contrary, the reduced driving speed increases the instantaneous current amount (that is, by largely adjusting the magnitude of the driving current waveform) to quickly adjust the driving speed of the piezoelectric ultrasonic vibration device 110 again.

The magnitude adjustment of the driving current waveform as described above controls the amount of current (that is, the magnitude of the current) through the power control circuit of the driving waveform adjusting unit 140.

4A and 4B are diagrams for describing a method of using driving voltage waveform control to adjust the driving speed of the piezoelectric ultrasonic vibration device 110.

More specifically, FIG. 4A is a waveform when the magnitude of the driving voltage waveform is largely adjusted, and FIG. 4B is a waveform when the magnitude of the driving voltage waveform is small.

As shown in FIG. 4A, when the size of the driving voltage waveform is greatly increased, the driving speed of the piezoelectric ultrasonic vibration device 010 may be increased. In contrast, the increased driving speed may reduce the size of the driving voltage waveform. In this case, the driving speed of the piezoelectric ultrasonic vibration device 110 may be slowly adjusted.

The magnitude adjustment of the driving voltage waveform as described above controls the amount of voltage (that is, the magnitude of the voltage) through the power control circuit of the driving waveform adjusting unit 140.

 5A and 5B are diagrams for explaining a method using a duty ratio adjustment to adjust the driving speed of the piezoelectric ultrasonic vibration device 110.

More specifically, FIG. 5A is a waveform of a case where a duty ratio (for example, a / b) is largely adjusted in a predetermined driving voltage waveform as shown in FIG. 2, and FIG. 5B is a small duty ratio of the driving voltage waveform. This is the waveform when adjusted.

As illustrated in FIGS. 5A and 5B, the duty ratio of the driving voltage waveform may be large or small, and the piezoelectric ultrasonic vibration device 110 may be driven at the fastest speed at a preset duty ratio. Therefore, by adjusting the duty ratio at a ratio other than a preset duty ratio, the driving speed of the piezoelectric ultrasonic vibration device 110 may be adjusted slowly.

For example, in the case of the driving apparatus 100 of the piezoelectric ultrasonic vibrating element in which the duty ratio is set to 50%, the driving speed of the piezoelectric ultrasonic vibrating element 110 is the fastest when the duty ratio is 50%, on the contrary, the duty ratio is 50%. When the ratio is not%, the driving speed of the piezoelectric ultrasonic vibration device 110 may be adjusted slowly according to the ratio.

The duty ratio adjustment of the driving voltage waveform as described above controls the duty ratio through the pulse generation circuit of the driving waveform adjusting unit 140.

6A through 6C are diagrams for describing a method using driving frequency control to adjust the driving speed of the piezoelectric ultrasonic vibration device 110.

More specifically, FIG. 6A illustrates a driving voltage waveform in which the optimum frequency region and the variable frequency region are periodically used together.

In the present invention, for convenience of explanation, the optimal frequency is set to 1 Mz and the variable frequency range is assumed to be 0.5 MHz to 2 MHz.

As shown in FIG. 6A, when the optimum frequency region and the variable frequency region are periodically used, the driving speed of the piezoelectric ultrasonic vibration device 110 is fastest in the optimum frequency region, and in the variable frequency region. The driving speed of the piezoelectric ultrasonic vibration device 110 is slowed.

Here, the region indicated by the arrow in Fig. 6A is the driving voltage waveform when driving to the optimum frequency region, and the remaining part is the driving voltage waveform when driving within the variable frequency region. The same applies to the following description of the drawings.

FIG. 6B shows a driving voltage waveform used by adjusting the variation width of the variable frequency region.

As shown in FIG. 6B, when the variation range of the variable frequency region is increased by adding a high frequency component or a low frequency component that is different from the optimum frequency, the operation is stopped while a signal which is not actually required for the operation of the piezoelectric ultrasonic driving device 110 is output. Since it is possible to reduce the driving speed of the piezoelectric ultrasonic driving device 110 as a whole.

For example, (a) of FIG. 6B shows a driving voltage waveform when the optimum frequency is 1 MHz and the variable frequency range is 0.5 MHz to 2 MHz. Shows the driving voltage waveform when the fluctuation range is increased from 0.5MHz to 10MHz.

Comparing (a) and (b) of FIG. 6B, for the same time, FIG. 6B (a) shows that the ratio of the driving voltage waveform in the variable frequency region to the driving voltage waveform at the optimum frequency occupies (b) of FIG. (B) of FIG. 6B is relatively lower than the driving voltage waveform at the optimum frequency than the driving voltage waveform at the optimum frequency than in the case of (a) of FIG. 6B.

That is, in FIG. 6B, the driving speed of the piezoelectric ultrasonic driving device 110 is relatively faster in case of (a), and the driving speed of the piezoelectric ultrasonic driving device 110 is relatively slow in case of (b).

Therefore, the driving speed of the piezoelectric ultrasonic driving element 110 can be adjusted by adjusting the variation width of the variable frequency region.

6C illustrates a driving voltage waveform used by adjusting a variation period of the optimum frequency region and the variable frequency region.

As shown in FIG. 6C, the entire frequency of the piezoelectric ultrasonic driving device 110 is driven by applying the same output ratio of the optimum frequency quenching and the variable frequency range, but not reducing the time for outputting the optimum frequency to perform a sufficient resonance operation. You can reduce the speed.

Comparing (a) and (b) of FIG. 6C, during the same time, FIG. 6C (a) shows the number of times that the driving voltage waveform at the optimum frequency is output (indicated by an arrow) twice, and that of FIG. (b) shows that the number of times the driving voltage waveform is output (the area indicated by the arrow) at the optimum frequency is three times.

This means that the driving speed of the piezoelectric ultrasonic driving device 110 is relatively slow in (a) in FIG. 6C, and the driving speed of the piezoelectric ultrasonic driving device 110 is relatively faster in (b). . Therefore, the driving speed of the piezoelectric ultrasonic driving device 110 may be controlled by adjusting the number of times the optimum frequency is output for the same time.

As described above, the driving frequency adjustment described with reference to FIGS. 6A to 6C controls the frequencies of the optimum frequency range and the variable frequency range through the pulse generation circuit of the driving waveform control unit 140.

FIG. 7 illustrates a drive current waveform using output limit control to adjust the driving speed of the piezoelectric ultrasonic vibration device 110.

More specifically, Fig. 7 is a drive current waveform when the output signal is limited.

As shown in FIG. 7, the driving speed of the piezoelectric ultrasonic vibration device 110 may be adjusted by periodically turning on / off the output voltage to control the output signal. That is, the piezoelectric ultrasonic vibration device 110 operates to be driven when the output voltage is turned on (indicated by an arrow), and the piezoelectric ultrasonic vibration device 110 is stopped when the output voltage is turned off and is not applied. In operation, when the on / off of the output voltage is periodically repeated, the driving speed of the piezoelectric ultrasonic vibration device 110 can be controlled to be fast (on state) or slow (off state).

On / off control of the output signal as described above controls the on / off through the power control circuit of the drive waveform control unit 140.

8 is a flowchart illustrating a method of driving a piezoelectric ultrasonic vibration device according to an embodiment of the present invention.

Referring to FIG. 8, the driving control unit 150 generates a driving voltage waveform or a driving current waveform for driving the piezoelectric ultrasonic vibration device 110 to drive a driving signal corresponding to the driving voltage waveform or the driving current waveform. Generate and supply it to the driving unit 160 (S801), to drive the piezoelectric ultrasonic vibration device 110 (S802).

In this case, the driving controller 150 determines whether a driving speed control request signal RS of the piezoelectric ultrasonic vibration device 110 is input (S803), and when the driving speed control request signal RS is input, it is determined. Transfer to the drive waveform control unit 140.

When the driving speed adjustment request signal RS is transmitted to the driving waveform adjusting unit 140, a waveform adjusting method (eg, driving voltage) in which at least one waveform of the driving voltage waveform, the driving current waveform, or the driving frequency waveform is described above. After adjusting according to the size of the waveform or driving current waveform, pulse width, duty ratio adjustment, driving frequency waveform adjustment, output voltage limit, etc. (S804), the adjusted waveform is transmitted to the driving controller 150.

Thereafter, the driving controller 150 returns to step S801 to repeat the subsequent steps. Specifically, when the adjusted waveform is transmitted to the driving controller 150, the driving controller 150 generates a driving signal according to the adjusted waveform and supplies it to the driving unit 160 (S801). The ultrasonic vibration device 110 is driven (S802).

On the other hand, in step S803, if the drive speed control request signal RS of the piezoelectric ultrasonic vibration device 110 is not input, the drive control unit 150 is a signal for ending the driving of the piezoelectric ultrasonic vibration device 110. Is inputted (SS805), and the driving of the piezoelectric ultrasonic vibration device 110 ends or continues.

As described above, the driving device 100 of the piezoelectric ultrasonic vibration device 100 according to the present invention controls the driving voltage waveform or the driving current waveform having a predetermined driving frequency applied to the piezoelectric body of the piezoelectric ultrasonic vibration device 110 in various ways. The driving speed of the ultrasonic vibration device 110 may be adjusted.

Therefore, when the lens movement speed test of the camera, even if the same drive voltage or drive current is applied to the camera module having a different lens feed rate for each product, there was no means to adjust the lens movement speed in the past, By mounting the driving device 100 of the piezoelectric ultrasonic vibration device according to the invention to the lens conveying device it is possible to control the lens feed rate by adjusting the driving speed of the piezoelectric ultrasonic vibration device 110. This makes it possible to have the same lens feed rate for camera products using the same piezoelectric ultrasonic vibration element.

Thus, the driving device 100 of the piezoelectric ultrasonic vibration device according to the present invention controls the driving speed of the piezoelectric ultrasonic vibration device 110 to operate the piezoelectric ultrasonic vibration device 110 to control the precision of the camera lens feed rate. It can be improved, thereby reducing audible noise (noise).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

1 is a block diagram of a driving device of an ultrasonic vibration device according to an embodiment of the present invention.

2 is a diagram illustrating an example of a driving voltage waveform having a predetermined driving frequency.

3A and 3B are views for explaining a method of using driving current waveform adjustment to adjust the driving speed of the piezoelectric ultrasonic vibration device of FIG.

4A and 4B are diagrams for describing a method of using driving voltage waveform adjustment to adjust the driving speed of the piezoelectric ultrasonic vibration device of FIG. 1.

5A and 5B are diagrams for describing a method using a duty ratio adjustment to adjust the driving speed of the piezoelectric ultrasonic vibration device of FIG. 1.

6A to 6C are diagrams for describing a method using driving frequency control to adjust the driving speed of the piezoelectric ultrasonic vibration device of FIG. 1.

FIG. 7 illustrates a driving current waveform using output limit adjustment to adjust the driving speed of the piezoelectric ultrasonic vibration device of FIG. 1.

8 is a flowchart illustrating a method of driving a piezoelectric ultrasonic vibration device according to an embodiment of the present invention.

 <Explanation of symbols for main parts of the drawings>

110: piezoelectric ultrasonic vibration element 120: drive waveform generator

130: frequency generator 140: drive waveform control unit

150: drive control unit 160: drive unit

Claims (10)

A piezoelectric ultrasonic vibration device in which the piezoelectric body is deformed and driven when a driving waveform is applied to the piezoelectric body; A drive waveform generator for generating a drive waveform for driving the piezoelectric ultrasonic vibration device; A drive waveform control unit for adjusting the drive waveform to control the drive speed of the piezoelectric ultrasonic vibration device; A driving control unit generating a driving signal according to the driving waveform generated from the driving waveform generating unit and the driving waveform adjusted from the driving waveform adjusting unit to control driving of the piezoelectric ultrasonic vibration device; And And a driving unit for supplying the generated driving signal to the piezoelectric ultrasonic vibration device to drive the piezoelectric ultrasonic vibration device at a driving speed of the driving signal. The piezoelectric ultrasonic vibration device of claim 1, further comprising a frequency generator connected to the driving waveform generator to generate a pulse having a frequency necessary for driving the piezoelectric element. According to claim 1, wherein the drive waveform control unit, A power control circuit for adjusting the magnitude and pulse width of the driving waveform; And And a pulse generating circuit for adjusting the duty ratio and driving frequency of the driving waveform. The apparatus of claim 1, wherein the driving waveform is at least one of a driving voltage waveform, a driving current waveform, and a driving frequency waveform. (A) generating a driving waveform for driving the piezoelectric ultrasonic vibration device, generating a driving signal according to the driving waveform, and driving the piezoelectric ultrasonic vibration device with the driving signal; And (B) determining whether the drive speed adjustment request signal of the piezoelectric ultrasonic vibration device is determined, adjusting the drive waveform when the drive speed adjustment request signal is present, and generating a drive signal according to the adjusted drive waveform to generate the drive signal. And driving the piezoelectric ultrasonic vibration device. The method of claim 5, wherein after step (B), (C) if the driving speed adjustment request signal is not input, determining whether a signal for terminating the driving of the ultrasonic vibration device is input, and ending or continuing driving of the ultrasonic vibration device. A method of driving a piezoelectric ultrasonic vibration device. The method of claim 5, wherein the driving waveform is at least one of a driving voltage waveform, a driving current waveform, and a driving frequency waveform. The method of claim 5, wherein step (A) is (A-1) generating a driving waveform for driving the piezoelectric ultrasonic vibration element; (A-2) generating a driving signal according to the driving waveform; And (A-3) driving the piezoelectric ultrasonic vibrating element at a driving speed of the driving signal. According to claim 5, wherein (B) step, (B-1) determining whether a driving speed control request signal of the piezoelectric ultrasonic vibration device is determined; (B-2) adjusting the at least one of magnitude, pulse width, duty ratio, and driving frequency waveform of the driving waveform to control the driving speed of the piezoelectric ultrasonic vibration device when the driving speed adjustment request signal is present; ; (B-3) generating a driving signal according to the adjusted driving waveform; And (B-4) driving the piezoelectric ultrasonic vibrating element at a driving speed of the driving signal. 10. The method of claim 9, wherein step (B-2) adjusts the driving waveform by turning on or off an output voltage to control the driving speed of the piezoelectric ultrasonic vibration device when the driving speed adjustment request signal is present. A method of driving a piezoelectric ultrasonic vibration element.

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