KR20140119226A - Electrovibration apparatus, voltage controlling apparatus and method for the same - Google Patents

Electrovibration apparatus, voltage controlling apparatus and method for the same Download PDF

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KR20140119226A
KR20140119226A KR1020130032675A KR20130032675A KR20140119226A KR 20140119226 A KR20140119226 A KR 20140119226A KR 1020130032675 A KR1020130032675 A KR 1020130032675A KR 20130032675 A KR20130032675 A KR 20130032675A KR 20140119226 A KR20140119226 A KR 20140119226A
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South Korea
Prior art keywords
voltage
regulating device
offset
touch
electrode
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KR1020130032675A
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Korean (ko)
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강정구
김희원
류제하
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광주과학기술원
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Publication of KR20140119226A publication Critical patent/KR20140119226A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/016—Input arrangements with force or tactile feedback as computer generated output to the user
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
    • H02N2/0075—Electrical details, e.g. drive or control circuits or methods
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/06—Drive circuits; Control arrangements or methods

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

An electric vibrating apparatus according to the present invention includes: an electrode; An insulator provided on one side of the electrode and capable of providing a touch surface; An electrode side voltage regulating device for supplying a voltage to the electrode under the control of the controller; And a touch-side voltage supply device for supplying a voltage to a portion to be touched to the touch surface under the control of the controller. According to the present invention, it is possible to improve the problem caused by the high voltage of the device and secure the operation stability of the hardware.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vibrating apparatus, a voltage adjusting apparatus for an electric vibrating apparatus,

The present invention relates to an electric vibrating device, a voltage adjusting device for an electric vibrating device, and a voltage adjusting method for the electric vibrating device.

BACKGROUND ART An electrovibration apparatus is called a name such as an electro-vibrating apparatus or an electrostatic actuator. The principle of the electric vibration is that when a finger touches an electrode to which a voltage is applied with an insulator interposed therebetween, the texture of the finger is felt by the electrostatic induction phenomenon. The above electrovibration was first discovered in 1954, and more details can be found in the document http://en.wikipedia.org/wiki/Electrovibration on the Internet web.

The electric vibration has been disclosed in more detail as an electric vibration device through U.S. Patent No. 8,174,373 and U.S. Patent No. 8,330,590. Referring to the cited document, it can be seen that the haptic interface is performed by touching the finger.

However, since the electrostatic force of the electric vibration device is weak, the haptic interface function can not be performed in a state where the finger is stopped, and the haptic function is performed through the vibration or texture generated when the finger moves . On the other hand, in order for the finger to move to such an extent that the haptic interface can be performed even when the finger moves, a considerably high level of voltage must be applied to the electrode. For example, U.S. Patent No. 8,174,373 illustrates 750V.

As shown, when a high voltage is applied to the electrode, a problem arises that a mobile device, such as a mobile device, on which the electric vibration device is mounted may malfunction due to noise generated at a high voltage. In addition, the higher the voltage is, the more difficult it is to develop the hardware and the more difficult it is to secure the operation stability of the hardware.

The full text of U.S. Patent No. 8,174,373 The full text of U.S. Patent No. 8,330,590

The present invention is proposed under the background described above and proposes an electric vibrating device, a voltage adjusting device for an electric vibrating device, and a voltage adjusting method for an electric vibrating device that can solve various problems caused by a high voltage.

According to an aspect of the present invention, there is provided an electric vibrating apparatus comprising: an electrode; An insulator provided on one side of the electrode and capable of providing a touch surface; An electrode side voltage regulating device for supplying a voltage to the electrode under the control of the controller; And a touch-side voltage supply device for supplying a voltage to a portion to be touched to the touch surface under the control of the controller.

In the electric vibrating device, at least one of the electrode side voltage regulating device and the touch side voltage regulating device includes a combining portion for combining an AC voltage and an offset voltage, and an amplifying portion for amplifying a voltage output from the combining portion . Here, the amplifying unit may be provided with a high voltage source, and the combining unit may be provided with a level shifter for combining the AC voltage and the offset voltage.

At least one of the electrode side voltage regulating device and the touch side voltage regulating device may provide an offset high voltage period signal. In addition, at least one of the electrode side voltage regulating device and the touch side voltage regulating device may be operable as a ground terminal. One of the electrode side voltage regulating device and the touch side voltage regulating device provides an offset high voltage periodic signal and either one of the electrode side voltage regulating device and the touch side voltage regulating device functions as a ground terminal .

On the other hand, the electrode side voltage regulating device and the touch side voltage regulating device can provide a periodic signal having an opposite polarity. At this time, the electrode side voltage adjusting device and the touch side voltage adjusting device may provide an offset high frequency period signal.

According to another aspect of the present invention, there is provided an apparatus for adjusting a voltage supplied to an electric vibration apparatus, comprising: a combining unit for combining an AC voltage and an offset voltage; And an amplifying unit for amplifying a signal output from the combining unit. Here, the amplification unit may be provided with a high voltage source.

According to still another aspect of the present invention, there is provided a method of adjusting a voltage supplied to an electric vibration apparatus, comprising: determining frequency, amplitude, waveform type, and offset voltage of an AC voltage; Providing an alternating voltage and an offset voltage in accordance with the information determined in the determining step; Synthesizing the AC voltage and the offset voltage to provide a periodic voltage signal including at least an offset voltage; And amplifying and outputting the period voltage signal including at least the offset voltage.

According to the present invention, a voltage can be separately applied to the electrode side and the touch side, an offset voltage can be applied to the applied voltage, and the electrode side and the touch side can be grounded. Thus, it is expected that a larger electrostatic force can be obtained under the condition of the same peak to peak voltage and frequency as in the conventional art.

In addition, it is possible to improve the problem caused by the high voltage and secure the operation stability of the hardware.

1 is a view for explaining the operation of an electric vibrating apparatus according to an embodiment;
2 is a block diagram of a voltage regulating device of an electric vibrating apparatus according to an embodiment.
3 is a flow chart for explaining a voltage adjusting method of the electric vibrating apparatus according to the embodiment.
4 is a graph showing voltage differences between the upper and lower insulators when the offset high-voltage periodic signal is applied to either the electrode or the finger and the other is grounded.
FIG. 5 is a graph showing the electrostatic force in the case of FIG. 4; FIG.
6 is a graph showing the voltage difference between the upper and lower insulators when a high-voltage periodic signal is applied to only the electrodes and no fingers are grounded without an offset component.
7 is a graph showing an electrostatic force in the case of Fig.
8 is a graph of a voltage signal when an offset high voltage periodic signal of V = 25 + 25 sin (2wt) is applied.
9 is a graph showing the electrostatic force in the case of Fig.
10 is a graph showing an applied voltage of the electrode side voltage regulating device.
11 is a graph showing an applied voltage of the touch-side voltage regulating device.
12 is a graph of a case where the electrode side and the touch side are synthesized.
13 is a graph of the electrostatic force generated in the case of Fig.
14 is a graph showing an applied voltage of the electrode side voltage regulating device.
15 is a graph showing an applied voltage of the touch-side voltage regulating device.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described below and those skilled in the art of the present invention can easily suggest other embodiments included in the scope of the same idea by adding, It will be understood that they are also included within the scope of the present invention.

1 is a view for explaining the operation of the electric vibration device according to the embodiment.

Referring to FIG. 1, an electrode 12 to which a voltage is applied and an insulator 13 provided on the electrode 12 are included. The electrode side voltage regulating device 2 capable of supplying a voltage to the electrode 12 and the touch side which can supply a voltage to the user's finger 4 as a portion contacting the insulator 13, And a voltage regulating device 3 are included. The electrode 12 may be provided on a substrate 11 exemplified by a transparent substrate. The substrate 11, the electrode 12, and the insulator 13 may be closely overlapped or pressed. The electrode side voltage regulating device (2) and the touch side voltage regulating device (3) can be adjusted by the controller (5).

When the electrode side voltage regulating device 2 operates as an AC voltage source and the touch side voltage regulating device 3 operates as a ground terminal, it can operate as a general electric transmission device. On the contrary, the electrode-side voltage regulating device 2 operates as a ground terminal and the touch-side voltage regulating device 3 can operate as a reverse-electrovibration device when operating as an AC voltage source. That is, the idea of the present invention is that the electrode side voltage regulating device 2 and the touch side voltage regulating device 3 can function as a voltage source or a ground terminal, which can be controlled by the controller 5 have.

Depending on the voltage application state of the electrode side voltage regulating device 2 and the touch side voltage regulating device 3, a touch or a touch occurs in the touch part exemplified by the finger. Which can act as a haptic interface.

2 is a block diagram of a voltage regulating device of an electric vibrating apparatus according to an embodiment.

Referring to FIG. 2, the voltage generating devices 2 and 3 of the electric vibrating device include a combining unit 40 for combining an AC signal and a DC signal, an amplifying unit 40 for amplifying a signal transmitted from the combining unit 40, (50). The amplified signal from the amplification unit 50 may be transmitted to the electrode 12 or the finger 4.

The configuration of the combining unit 40 will be described in more detail.

The synthesizer 40 is provided with a signal generator 21 for generating an AC voltage and an offset voltage generator 22 for generating an offset voltage. Signals generated by the signal generator 21 and the offset voltage generator 22 are transferred to a level shifter 23 and synthesized.

In the level shifter 23, an AC voltage and an offset voltage can be synthesized by using an operational amplifier. The offset voltage generator 22 may convert a digital signal transmitted from the controller 5 into an analog signal. The signal generator 21 can generate an AC voltage by a signal transmitted from the controller 5. The signal generated by the signal generator 21 may be provided in various forms such as a square wave, a sine wave, and the like.

The final signal provided from the combining unit 40 becomes a periodic voltage signal including at least an offset voltage. Since the signal provided from the combining unit 40 is a periodic voltage signal including at least an offset voltage, the operation is performed by the controller 5, and then the offset voltage is generated in a signal generator capable of operating as a DAC And may provide a periodic voltage signal to be included.

The amplification unit 50 is provided with a high voltage source 24 for supplying a high voltage and a high voltage amplifier 25. In the high voltage amplifier 25, the period voltage signal including at least the offset voltage provided from the combining section 40 is used as a signal, and the high voltage source 24 is used to provide an offset high voltage period signal.

3 is a flowchart for explaining a voltage adjusting method of the electric vibrating apparatus according to the embodiment.

Referring to FIG. 3, an AC voltage and an offset voltage are determined according to the touch feeling or texture of the user required in the haptic interface (S1). First, the waveform can be determined according to the type of the haptic interface, and can be selected as sinusoidal waves, square waves, and the like. In the case of a sinusoidal wave, the AC voltage can be given as V 1 = Asin (2wt), where the amplitude and frequency can be determined. The offset voltage may be determined, for example, as V 0 = A. The offset voltage may also be determined differently depending on the type of the haptic interface.

Each signal is generated in accordance with the determined alternating voltage and the offset voltage (S21) (S22). As a result, V 1 = Asin (2wt) and V 0 = A, respectively.

The AC voltage and the offset voltage are synthesized (S3). The synthesized signal can be given as V 2 = A + Asin (2wt) as a periodic voltage signal including an offset voltage.

The above process can be performed in the synthesis unit 40 under the control of the controller 5. [ The amplification unit 50 amplifies the signal received from the synthesis unit 40 (S4). The amplified signal as a high-voltage periodic signal offset can be encoded as B = V 3 + Bsin (2wt). It has already been described that a high voltage source 24 is provided to enable the amplification function to be performed at this time. After the amplification is performed (S4), this signal can be output and supplied to the electrode 12 or the finger 4 (S5).

Hereinafter, a description will be given in detail of a mode in which a voltage is applied to the electric vibrating apparatus, taking an offset high voltage period signal as a main example.

≪ First voltage application mode >

Fig. 4 shows the voltage difference between the upper and lower insulators when the offset high-voltage periodic signal is applied to either the electrode or the finger and the other is grounded, and Fig. 5 shows the electrostatic force in the case of Fig. In FIG. 5, the unit of the electrostatic force can be understood as a relative value in which the other conditions are the same and the voltage is different. This is the same in the other drawings below.

Referring to FIG. 4, the applied offset high voltage cyclic signal appears between both ends of the insulator. At this time, the amplitude B in the offset high voltage period signal is exemplified by 50, so the peak to peak voltage is 100 V pp . The electrostatic force is given by the following equation (1).

Figure pat00001

Where F is the electrostatic force,? Is the dielectric constant, A is the area of the electrode, V is the voltage and d is the distance between the two electrodes.

When the electrostatic force is expressed according to Equation (1), as shown in FIG. 5, a minimum value of 0 to a maximum value of 10000 can be provided.

This is compared with the case where a voltage of V = 50 sin (wt) without offset voltage is applied across the insulator. 6 shows the voltage difference between the upper and lower portions of the insulator when the high-voltage periodic signal is applied only to the electrode without the offset component and the finger is grounded, and Fig. 7 shows the electrostatic force in the case of Fig.

Referring to FIGS. 6 and 7, the peak-to-peak voltage is equal to 100 V pp , but the electrostatic force is less than 1/4 as compared with the case where the offset voltage is from 0 to 2500 at the minimum. In order to obtain the same electrostatic force, however, it is necessary to apply a frequency twice as much as the offset voltage when the offset voltage is applied.

The result is the same as that in the case where there is an offset voltage as compared with the case where there is no offset voltage, only half of the offset voltage is required. Therefore, when there is an offset voltage, the effect of reducing the required voltage by half can be expected.

FIG. 8 is a voltage signal when an offset high voltage periodic signal of V = 25 + 25 sin (2wt) is applied, and FIG. 9 is a graph showing an electrostatic force in the case of FIG.

8 and 9, it can be seen that the peak-to-peak voltage is 50 V pp, but the electrostatic force is from 0 to 2500 at minimum. That is, it can be seen that the same electrostatic force is generated as in the case where a signal of twice the voltage, that is, V = 50 sin (wt) is applied without an offset voltage.

According to the above description, it can be seen that, in the case of the offset high voltage periodic signal, the same electrostatic force can be obtained even at a low voltage as compared with the case where there is no offset voltage. Further, although the offset voltage may be larger or smaller than the amplitude of the alternating current signal, it can be appreciated that the offset voltage can realize a larger electrostatic force even by a lower voltage.

In the first voltage application mode, when controlling the electrode side voltage regulator (2) and the touch side voltage regulator (3), an offset high voltage period signal is applied to one of them and the other is operated as a ground terminal . However, if there is a need to lower the voltage, the offset voltage can also interfere with the normal operation of the device. Furthermore, if the frequency is high, a corresponding high frequency interference may occur. Therefore, it can be said that a method capable of coping with this is additionally required.

≪ Second voltage application mode >

10 is a graph showing the voltage applied to the electrode side voltage regulating device, and Fig. 11 is a graph showing the voltage applied to the touch side voltage regulating device.

10 and 11, V = Asin (wt) is applied to the electrode side voltage regulating device 2 and V = -Asin (wt) is applied to the touch side voltage regulating device 3 . Since the voltage applied to each voltage regulating device 2 is different and the other is the same, the voltage between both surfaces of the insulator 13 is given by V = 2 Asin (wt), and the graph shown in FIG. 12 . At this time, it can be seen that the electrostatic force is from 0 to 10000 as shown in Fig.

According to the second voltage application mode, the electrostatic force is improved four times as compared with the case where a voltage signal of V = Asin (wt) is applied to either the electrode side or the touch side (Figs. 6 to 7) have. Also, in this case, it can be confirmed that it is not necessary to increase the frequency. The second voltage application mode can be understood as a signal having only positive and negative polarities opposite to the same frequency and amplitude.

However, in order to provide a specific haptic interface, the frequency and amplitude may be tightly adjusted. In this case, it would be possible to provide more variety of signals.

≪ Third voltage application mode >

The third voltage application mode describes a case where the first voltage application mode and the second voltage application mode are considered together.

FIG. 14 is a graph showing an applied voltage of the electrode side voltage regulating device, and FIG. 15 is a graph showing the applied voltage of the touch side voltage regulating device. Referring to FIGS. 14 and 15, Can be given by V = A / 2 + A / 2 sin (2wt) and V = -A / 2 - A / 2 sin (2wt).

At this time, the voltage across both ends of the insulating plate 13 can be given as V = A + Asin (2wt) as a difference between positive voltages. This can be expected to improve the electrostatic force four times as in the case of Fig.

Each of the voltage application types described above can be adaptively operated according to various situations such as a requirement situation of the haptic interface, a feeling / convenience of the user, a voltage condition, and the like. Of course, they may be operated while being switched under control of the controller 5. [

According to the present invention, it is possible to drive the electric vibration apparatus even by utilizing a relatively low voltage. Therefore, the problem of malfunction occurring in equipment such as a mobile device on which the electric vibration device is mounted is improved, a large volume of equipment is not required to make a high voltage, the hardware configuration is easy, and the hardware is stably operated .

2: Electrode side voltage regulator
3: Touch side voltage regulator

Claims (12)

electrode;
An insulator provided on one side of the electrode and capable of providing a touch surface;
An electrode side voltage regulating device for supplying a voltage to the electrode under the control of the controller; And
And a touch-side voltage supply device for supplying a voltage to a portion to be touched on the touch surface under the control of the controller. The method according to claim 1,
Wherein at least one of the electrode side voltage regulating device and the touch side voltage regulating device includes a combining portion for combining an AC voltage and an offset voltage and an amplifying portion for amplifying a voltage outputted from the combining portion. 3. The method of claim 2,
Wherein the amplification section is provided with a high voltage source. 3. The method of claim 2,
Wherein the synthesizer is provided with a level shifter for synthesizing the AC voltage and the offset voltage. The method according to claim 1,
Wherein at least one of the electrode side voltage regulating device and the touch side voltage regulating device is capable of providing an offset high voltage period signal. The method according to claim 1,
Wherein at least one of the electrode side voltage regulating device and the touch side voltage regulating device is operable as a ground terminal. The method according to claim 1,
Wherein either one of the electrode side voltage regulating device and the touch side voltage regulating device provides an offset high voltage periodic signal and either one of the electrode side voltage regulating device and the touch side voltage regulating device is an electric oscillation Device. The method according to claim 1,
Wherein the electrode side voltage regulating device and the touch side voltage regulating device can provide a periodic signal whose polarity is opposite. 9. The method of claim 8,
Wherein the electrode side voltage regulating device and the touch side voltage regulating device are capable of providing an offset high frequency period signal. An apparatus for adjusting a voltage supplied to an electric vibration device,
A synthesizer for synthesizing an AC voltage and an offset voltage; And
And an amplifying section for amplifying a signal output from said combining section. 11. The method of claim 10,
Wherein the amplifying section is provided with a high voltage source. A method of adjusting a voltage supplied to an electric vibration device,
Determining the frequency, amplitude, waveform type, and offset voltage of the AC voltage;
Providing an alternating voltage and an offset voltage in accordance with the information determined in the determining step;
Synthesizing the AC voltage and the offset voltage to provide a periodic voltage signal including at least an offset voltage; And
And amplifying and outputting the period voltage signal including at least the offset voltage.
KR1020130032675A 2013-03-27 2013-03-27 Electrovibration apparatus, voltage controlling apparatus and method for the same KR20140119226A (en)

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