KR20160127644A - Apparatus and method of forming localized vibration, and method for arranging exicitors - Google Patents

Abstract

Disclosed are an apparatus for forming a localized vibration field, and a method therefor. The disclosed apparatus for forming a localized vibration field comprises: a planar member; a plurality of exciters disposed near the circumference of the planar member to excite the planar member; and a driving controller vibrating the exciters by using a substantially same excitation frequency. The exciters excite a local region of the planar member and are arranged to suppress vibration of a rest of regions except the local region of the planar member.

Description

[0001] The present invention relates to an apparatus and method for forming a local oscillation field, and a method for arranging exciters,

The present disclosure relates to a local oscillation field forming apparatus and method for arranging a oscillating field in a plate-shaped member such as a display panel to form a local oscillating field in the plate-shaped member, and a method for arranging the exciter in such a local oscillation field forming apparatus.

Various technologies have been used to implement tactile sensations in electronic devices such as smart phones and tablet PCs. One of the most common techniques used for tactile implementations is a spinning motor with an off-center weight that vibrates the entire electronic device. In touch-screen electronic devices, this technique is used to reproduce the feeling of pressing physical buttons / keys. For example, when a user touches a button displayed on a touch screen display, the entire electronic device is vibrated by rotating the motor for a short period of time.

In addition, electronic devices such as smart phones and tablet PCs provide images through a display panel with a frame (or bezel) that is as thin as possible for portability, space usability, and aesthetics. However, due to the thinness of the device itself and the thin frame width, only small speakers can be mounted. It is difficult to provide medium / low-frequency sound with such small speakers. Therefore, unless the audio equipment is connected to the outside separately, there is a limit to providing a natural and rich sound by itself.

And an apparatus for forming a vibrating field pattern in a local area of an external appearance of an electronic apparatus.

(EN) An apparatus for forming a vibrating field pattern capable of feeling haptic sensation in a local area of an external appearance of an electronic device.

And to provide a vibrator arrangement method for optimally arranging exciter groups that form a vibrating field pattern in a local area of an outer appearance of an electronic device.

We want to provide rich sound with medium / low frequency in electronic devices.

An apparatus for forming a local oscillation field according to one aspect includes: a plate-like member; A plurality of vibrators disposed at a plurality of positions in the vicinity of the periphery of the plate member to excite the plate member; And a drive controller for vibrating the plurality of exciter groups at substantially the same excitation frequency, wherein the plurality of exciter groups excite a local region of the plate-shaped member, and exclude the local region from the plate- To suppress the vibration of the vehicle.

According to another aspect of the present invention, there is provided a method of forming a local oscillation field, comprising: disposing a plurality of exciters at a plurality of positions near a periphery of a plate-shaped member; And vibrating the plurality of vibrators at substantially the same oscillation frequency to excite the plate-like member, wherein the step of exciting the plate-shaped member includes exciting a local region of the plate-like member, It is possible to suppress the vibration of the remaining region except for the local region.

According to yet another aspect of the present invention, there is provided a method of disposing exciters for vibrating a localized area of a plate-shaped member by vibrating the plate-shaped member at a plurality of positions near the periphery of the plate-shaped member, Exciting a plurality of candidate positions in the vicinity of the circumference with the same excitation frequency; Calculating a correlation of vibrations at the plurality of candidate positions with respect to local oscillations of the plate member to select candidate positions that are relatively independent of the local oscillation of the plate member; And placing the groups in the selected independent candidate positions.

The apparatus for forming a local oscillation field according to the disclosed embodiment can form a vibrating field pattern in a local region of an outer appearance of an electronic device.

The apparatus for generating a local oscillation field according to the disclosed embodiment can provide a feeling of tactile sensation in a local area of an outer appearance of an electronic device.

The apparatus for generating a local oscillation field according to the disclosed embodiments can provide an electronic apparatus with a rich sound including frequencies in the middle or low frequencies of the audio frequency band.

The exciter arrangement method according to the disclosed embodiment can optimally arrange exciters that form a vibrating field pattern in the local region of the outer appearance of the electronic device.

FIG. 1 is a view schematically showing an external appearance of an electronic apparatus employing a local oscillation field forming apparatus according to an embodiment.
2 schematically shows a device for forming a local oscillation field according to an embodiment.
3 is a flow chart for explaining a method of arranging the exciter groups.
Fig. 4 is an exemplary view showing an independent position among a plurality of candidate positions in the plate-like member.
5 is a chart showing the relationship between the vibration velocity and the human tactile sense.
Fig. 6 schematically shows an operation in which a local oscillation field is formed in the local oscillation excitation field forming apparatus of Fig.
FIGS. 7 to 10 show results of implementing a local oscillation field formed according to a local oscillation field forming method according to an embodiment.
Figs. 11 and 12 show the results of implementing the local oscillation field formed according to the local oscillation field forming method according to another embodiment.
13 and 14 show the results of implementing the local oscillation field formed according to the method of forming a local oscillation field according to another embodiment.
15 is a view schematically showing a device for forming a local oscillation field according to another embodiment.
Figs. 16 and 17 schematically show the operation of forming the local oscillation field in the local oscillation field forming apparatus of Fig.
FIG. 18 shows the amplitude and phase characteristics of the local oscillation field formed in the local oscillation length forming apparatus of FIG.

The terms used in this specification will be briefly described and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention in the drawings, parts not related to the description will be omitted.

FIG. 1 is a view schematically showing an appearance of an electronic device 10 employing an apparatus 100 for forming a local oscillation field according to an embodiment. FIG. 2 schematically shows an apparatus 100 for forming a local oscillation field And FIG. 3 is a side view schematically showing the apparatus 100 for forming a local oscillation field.

1, the electronic device 10 may be an information and communication technology (ICT) device such as a smart phone or a tablet PC. The electronic device 10 may include a housing 11 and a display panel 12 as shown in Fig. The housing 11 may have a plate shape. The display panel 12 may be positioned on one side of the housing 11.

2, the apparatus 100 for forming a local oscillation field of the present embodiment may include a plate member 110, a plurality of exciters 120, and a drive controller 190.

The plate-like member 110 is formed of an excavable material. The plate member 110 may be a part of the electronic device 10 described with reference to Fig. For example, the plate member 110 can be understood as a display panel 12 of the electronic device 10 of Fig. The plate member 110 may have a flat plate shape, but is not limited thereto. For example, the plate member 110 may be a curved plate.

The plurality of vibrators 120 are disposed in the vicinity of the periphery of the plate member 110 to allow the plate member 110 to move. The vicinity of the periphery of the plate member 110 means the periphery of the plate member 110 or its vicinity. For example, the plurality of exciter 120 can be disposed on the back surface of the display panel 12 in the electronic device 10 described with reference to Fig. The plurality of exciter 120 can be arranged such that when the plate member 110 vibrates as described later, the vibrator 120 vibrates in the local region and the vibration in the remaining region can be suppressed. That is, the plurality of vibrators 120 form a vibration field pattern so that haptic sensation can be reliably felt only in a specific area or a place where the plate member 110 is in contact with the hand. As will be described later, the plurality of vibrators 120 can be disposed only at positions that contribute independently to the vibration field pattern. A detailed arrangement method of the plurality of vibrators 120 will be described later.

The vibrator 120 may be, for example, a piezoelectric element. The piezoelectric element is formed, for example, by arranging electrodes on the top and bottom surfaces of a piezoelectric lattice crystal, and causes vibration from a change in thickness of the piezoelectric single crystal corresponding to a signal voltage applied to the electrodes.

The drive controller 190 drives the plurality of exciter 120 to oscillate at substantially the same excitation frequency. At this time, the excitation frequency can be selected in a frequency band in which the touch due to vibration is sensitive. The drive controller 190 can independently drive each of the plurality of exciters 120 so that the amplitudes and phases of the plurality of exciters 120 are different from each other.

Next, with reference to FIGS. 3 and 4, a method of arranging the vibrators 120 according to an embodiment will be described.

4, first, groups 120 are placed at a plurality of candidate positions S in the vicinity of the periphery of the plate member 110 (S210), and the exciter groups 120 are disposed at the same excitation frequency (S220). As shown in FIG. 4, thirty-four small moving-coil type exciters 120 are attached to the boundary of the tempered glass panel P at uniform intervals, and LDV (Laser Doppler Vibrometer) The transfer matrix can be obtained from the relationship between the electrical input signal input to the exciters 120 and the velocity response at the measurement point. Here, the tempered glass panel P is used as a display panel (11 in FIG. 1) and can be understood as a plate member 110 of the present embodiment. The input signal of each exciter 120 required for control can be obtained by an inverse problem method through an eigen-function expansion method or a bending traveling wave control method. The transfer matrix between the exciters 120 and oscillating fields used in the inverse problem can be decomposed using singular value decomposition. The singular value decomposition method is to decompose the orthogonal square matrix into a diagonal matrix using the eigenvalues as a basis by using the spectral theory.

Next, the correlation of the vibrations at the plurality of candidate positions S with respect to the local oscillation of the plate member 110 is calculated to determine the relative positions S2 (S2) relative to the local oscillation of the plate member 110 (S230). At this time, the independence between the exciter groups 120 can be determined according to the square of the singular vector obtained by the singular value decomposition method. The excitations at the remaining positions S1 except for the independent positions S2 may be derived as a combination of excitations at independent positions S2.

As one embodiment for obtaining a signal to be input to the excitation units 120, a method of eigenfunction expansion method will be described in detail.

The response of the structure receiving the external force can be expressed by Equation 1 and Equation 2 using eigenfunction expansion as follows, which is constituted by a mode variable representing the vibration characteristic of the system.

Here, n is the mode order of, A _i is i weight, Λ _n is n norm of the second mode (norm), ω _n of the device 120 with the second is the natural frequency, ψ _n are eigenfunctions, ψ _n ⁱ is with Eigenfunction value at the point, and η _n means the loss coefficient. The same vibration field is defined as γ _n for each mode. The response according to the mode-dependent contribution can be expressed by Equations (3) and (4) as follows using the orthogonality of the eigenfunction.

Where W _n is the contribution of the n-th mode. Using Equations (3) and (4), the mode-specific contribution can be obtained in the target vibration field. In order to realize a desired target oscillation field, a desired mode-dependent contribution can be implemented by adding a weight of an appropriate oscillator 120 to a vibrator 120 constituted by an array arranged at a boundary. The response when the N vibrators 120 are used can be found from Equation (1), and the following Equation (5) can be obtained by using the mode-specific contribution of the vibration field as a target.

The relational expression of the weight of the vibrator 120 and the contribution of each mode can be expressed by a determinant, and the weights at which the target vibration field can be obtained can be obtained by the following equations (6) and (7).

Where A is the weight of the exciter 120, W is the mode contribution, Ψ is the transfer matrix between A and W consisting of modal information, and † is a pseudo-inverse.

As another embodiment for obtaining a signal to be input to the exciting means, a bending traveling wave control method will be described in detail.

When excited at any position in the structure, the bending propagating elastic waves propagate therefrom. When there are response information measured from the N exciter 120 and p measurement points therefrom, it can be expressed by the following matrix equation of Equation (8).

Here, the matrix G uses a frequency response function measured experimentally as a transfer matrix between the input signal of the exciter 120 and the velocity response. E is the input signal of the exciter 120, and V is the velocity matrix at the measurement point. In order to obtain the input signal E of the exciter 120, a transfer matrix and a target oscillation field can be used to obtain the inverse problematic method as follows.

In addition to this, the Tikhonov normalization method can be applied as shown in Equations (10) and (11) below to obtain a vibration field approximate to a desired target vibration field.

Here, J is a price function for considering the input power, E _F is an input signal, and H is an Hermite operator. The weight β can be obtained using a GCV function (generalized cross validation function). Through the normalization process, it can be seen that the power can be realized with less power than the input power of the exciter 120 when the normalization is not performed.

Next, a method for selecting relatively independent positions at a plurality of candidate positions S of the plate-like member 110 will be described in detail.

If only the exciter 120 having a linearly independent relationship in the exciter 120 is selected, unnecessary exciter 120 can be selected and used. The effective independence method (EfI) can be used to select independent relationships. With this method, it is possible to find the optimum arrangement by grasping the linear independent relationship among the candidate groups of the vibrators 120 at different positions.

For example, in the eigenfunction expansion method, the transfer matrix Ψ is used in Equation (6), which is a determinant composed of the weights (120) and the contributions of each mode, and the linear independence factor (EfI value) (12).

Or bending-type elastic traveling wave control method, the linear independence factor (EfI value) can be expressed by Equation (13) as follows using the transfer matrix G between the weight of the exciter 120 and the velocity response.

Using the singular value decomposition method (SVD), the obtained value is given a representation of the EfI value decomposed by the following equation (14): < EMI ID =

The independence between exciters 120 can be determined according to the squared magnitude of the obtained singular vectors as shown in Equation (14). The effective independent position is selected by removing the position of the vibrator 120 having the smallest value among these values, and the position of the vibrator 120, which is most independent from the number of the given vibrators 120, is selected optimally. If the error is defined in advance, it is possible to grasp the minimum number of vibrators 120 necessary for forming the vibrating field and the optimum arrangement.

Based on the independence between the exciting groups 120 as described above, it is possible to provide a minimum number of exciters 120 for optimal placement or optimal excitation of a particular number of exciters 120 for excitation. As described above, according to the vibrator arrangement method of the present embodiment, it is possible to downsize the apparatus for forming a local oscillation field, which has been difficult to implement in the past due to the limitation of the number of exciters 120 available.

Next, the local oscillation field forming method will be described with reference to the local oscillation field forming apparatus 100 of the present embodiment.

The local oscillation field forming apparatus 100 realizes localization of oscillation by using a plurality of exciters 120 disposed on the display panel 10 and the plate member 110 of the electronic apparatus. For this purpose, a target achievement factor can be used to select a target vibration field pattern based on the most sensitive frequency and magnitude of the tactile sensation, to vibrate in the form of standing waves, and to evaluate the implementation results accordingly. The position of the vibrator 120, which is the most independent among the exciter 120, can be optimally selected through the determination of the independence between the exciter 120 and the minimum exciter 120 It is possible to grasp the number and optimal arrangement of the devices 120.

In order to realize a target vibration pattern composed of a vibrational tactile area having a large amplitude on the display panel 10 and a nonvolatile area having no tactile feeling having a small amplitude, a frequency, an amplitude, and / or a tactile sense difference limen) can be selected. In addition, it can be used as an evaluation value by making a goal achievement about formation of vibrational tactile area and non-vibrationless tactile area.

Fig. 5 is a chart showing the relationship between the vibration velocity and human tactile sense, and Fig. 6 schematically shows an operation in which a local oscillation field is formed in the plate-shaped member. As shown in FIGS. 5 and 6, the target vibration field pattern is a vibration zone (hot zone), which is a region where strong vibration and vibration can be felt, and a non-vibration area (cold zone). Considering the cognitive information about the tactile sensation of the human finger, the maximum energy of the non-vibration region without touch is different by 2 dB or more from the vibro-tactile threshold, Energy can be varied by more than 2 dB. Such a target vibration field can be implemented as shown in FIG. Such a vibration touch threshold may vary slightly depending on the frequency of the vibration. In order to provide an efficiency of the input electric signal and an effective vibration sense, a frequency near the frequency of 300 Hz in which the vibration tactile threshold by vibration is minimum, or a narrow band signal whose center frequency is the frequency (for example, 250 Hz to 350 Hz As shown in Fig.

In the present embodiment, the achievement factor is defined as a success ratio (S) for evaluating the result of the target vibration field based on the tactile information by the vibration such as the threshold value and the discrimination station. The maximum energy of the non-vibration region, which is a condition based on the threshold value and the discrimination information, measured in the vibration area of the target area and the non-vibration area without touch, is 2 dB or more The minimum energy of the vibrational tactile area is also shifted by 2 dB or more.

FIGS. 7 to 10 show results of implementing a local oscillation field in a case where the eigenfunction expansion method is applied as a method of forming a local oscillation field according to an embodiment. FIGS. 7 and 8 show results of implementation of a local oscillation field applied to a 2x2 segmented region, and FIGS. 9 and 10 show results of implementation of a local oscillation field applied to a 3x3 segmented region.

The region where the vibration velocity is less than about 0.2 mm / s corresponds to the vibrationless region where there is no tactile sensation that does not recognize the vibration. The region where the vibration velocity is more than about 0.2 mm / s corresponds to the area where the vibration is tactile. A vibration velocity of 0.2 mm / s can be understood as a vibro-tactile threshold. Referring to FIGS. 7 and 8, it can be seen that the vibration-sensing implementation area having a vibration velocity of about 0.2 mm / s or more is locally limited to the upper-left area of the 2x2 partitioned area. At this time, the achievement ratio (S) was calculated as approximately 90.2%. Of course, a vibration velocity of 0.4 mm / s or more can recognize a more significant vibration, and furthermore, a vibration velocity of 0.6 mm / s or more can recognize a more reliable vibration. As shown in FIG. 10, it can be seen that it can be locally limited in a 3x3 partitioned area. When applied to a 3x3 partition, the achievement ratio (S) was measured to be approximately 86.5%.

FIGS. 11 and 12 show results of implementing a local oscillation field formed according to a bending type elastic traveling wave control method (normalization not yet used) as a method of forming a local oscillation field according to another embodiment. 11 shows the result of implementing the local oscillation field applied to the 2x2 segmented region, and FIG. 12 shows the result of implementing the local oscillation field applied to the 3x3 segmented region. Referring to FIG. 11, the achievement ratio S is calculated to be approximately 97.4% when applied to a 2x2 divided area. Referring to FIG. 12, the achievement ratio S is calculated to be approximately 98.7% when applied to a 3x3 partitioned area.

Figs. 13 and 14 show results of implementing a local oscillation field formed according to a bending type elastic traveling wave control method (normalization application) as a method of forming a local oscillation field according to another embodiment. FIG. 13 shows the result of implementing the local oscillation field applied to the 2x2 segmented region, and FIG. 14 shows the result of implementing the local oscillation field applied to the 3x3 segmented region. Referring to FIG. 13, the achievement ratio S is calculated to be approximately 98.7% when applied to a 2x2 divided area. Referring to Fig. 14, the achievement ratio S is calculated to be approximately 98.7% when applied to a 3x3 partitioned area.

The above-described embodiment is described by taking the case where the apparatus 100 for generating a local oscillation field is provided on the display panel 10 of the information electronic apparatus, but the present invention is not limited thereto. As another example, the plurality of exciters 120 may be disposed around the back plate (i.e., the back surface of the display panel 10) of the information electronic apparatus. As another example, when the information electronic apparatus is not provided with the display panel 10, it may be provided on a plate member having a predetermined width.

FIG. 15 is a view schematically showing an apparatus 300 for forming a local oscillation field according to another embodiment.

Referring to FIG. 15, the local oscillation field forming apparatus 300 of the present embodiment may include a plate member 310, a plurality of exciting units 320, and a driving controller 390.

The plate member 310 is formed of a material that can be excavated. The plate member 310 may be part of the electronic device 10 described with reference to Fig. For example, the plate member 310 can be understood as the display panel 12 of the electronic device 10 of Fig. The plate member 310 may have a flat plate shape, but is not limited thereto. For example, the plate member 310 may be a curved plate.

The plurality of vibrators 320 are disposed in the vicinity of the periphery of the plate member 310 to bring the plate member 310 into engagement. The plurality of exciter groups 320 may be attached in a single closed curve shape close to the boundary of the plate member 310 to form a single exciter array. For example, the plurality of exciters 320 may include a plurality of exciters 320 at positions very close to the rear-side boundary or boundaries of the display panel 12 in the electronic device 10 described with reference to FIG. 1, As shown in Fig. The plurality of exciters 320 may be, for example, piezoelectric elements. The drive controller 390 drives the plurality of exciters 320 to oscillate at substantially the same excitation frequency. The drive controller 390 can independently drive each of the plurality of exciters 120 so that the amplitudes and phases of the plurality of exciters 120 are different from each other.

16 and 17 schematically show the operation of forming the local oscillation field in the local oscillation excitation field forming apparatus 300 of this embodiment. It induces a single-mode vibration with a constant phase in a specific local sound source region where the sound is to be emitted, and does not cause excitation in the other regions. The non-excited non-vibration region can be understood as a baffle of the speaker. Those skilled in the art will appreciate that, as with the embodiment described with reference to Figs. 1 to 14, the sound source forming region in the plate member 110 can be generated at various positions through the proper arrangement of the exciter 320 and the input signal .

18 is an experimental example showing the amplitude and phase characteristics of the local oscillation field formed in the local oscillation excitation field forming apparatus 300 of this embodiment. Referring to FIG. 18 (a), it can be seen that vibration is generated only in region A. 18 (b), it can be seen that the vibrations in the region A have the same phase.

The user can feel the effect of direct sound from the plate member 310 by the local oscillation field forming apparatus 300 of the present embodiment. By varying the input electrical signal in the array of exciter (s) 320, it is possible to change the position S of the excitation source within the plate member 310. Spatial efficiency is high because no additional speaker unit is required. The limit characteristic of the low-frequency sound is determined by the size of the sound source. Since the local oscillation field forming apparatus 300 of the present embodiment uses a wide-area sound source, it is possible to implement a medium / low- . That is, the local oscillation field forming apparatus 300 of the present embodiment can be applied to the display panel 12 of the electronic apparatus 10 to provide a medium / low frequency sound in a specific local area within the display panel 12, It is possible to suppress the generation of vibration, thereby improving the sound emission efficiency and reducing the distortion, thereby providing a natural and superior sound to the user.

Although the apparatus and method for forming a local oscillation field and the method for arranging an oscillator according to the present invention have been described with reference to the embodiments shown in the drawings in order to facilitate understanding, It will be understood that various modifications and equivalent embodiments are possible. Accordingly, the true scope of the present invention should be determined by the appended claims.

10: Electronic device
11: Housing
12: Display panel
100, 300: Local oscillation field forming device
110, 310: Plate member
120, 320: exciter
190, 390: drive controller

Claims (20)

A plate-like member;
A plurality of vibrators disposed at a plurality of positions in the vicinity of the periphery of the plate member to excite the plate member; And
And a drive controller for oscillating the plurality of exciter groups at substantially the same excitation frequency,
Wherein the plurality of exciter groups are arranged to excite a local region of the plate-shaped member and to suppress vibration in regions other than the local region in the plate-like member. The method according to claim 1,
Wherein the plurality of vibrators excites the local region with a vibration energy greater than the vibration tactile threshold and excites a region other than the local region in the plate member with a vibration energy smaller than the vibration tactile threshold, Device. 3. The method of claim 2,
Wherein the plurality of exciters excites the local region with a vibration energy of at least 2dB or more than the vibration tactile threshold value and causes the remaining region of the plate member excluding the local region to be substantially 2dB or less The local oscillating field forming device for exciting the oscillating region with the oscillation energy of the local oscillating field. 3. The method of claim 2,
Wherein the plurality of exciters excite the localized region in the plate-shaped member with a vibration energy of substantially greater than or equal to 4 dB as the vibration energy of the plate-shaped member, excluding the local region. The method according to claim 1,
Wherein said plurality of vibrators excites said plate-like member such that said localized region vibrates at a frequency of mid-range or low-range in an audible frequency band. The method according to claim 1,
Wherein the drive controller sets the position of the local region of the plate-like member by controlling at least one of the amplitude and the phase of the plurality of vibrators. The method according to claim 1,
Wherein the plurality of vibrators are disposed in the vicinity of a node of vibration of the plate-like member. The method according to claim 1,
The plurality of exciters exciting the plate-like member such that the localized region oscillates in a single mode having a constant phase. The method according to claim 1,
Wherein the plurality of vibrators are at least one of a moving coil oscillator, a piezoelectric exciter, and an eccentric weight motor. The method according to claim 1,
Wherein the plate member is a flat plate or a curved plate. The method according to claim 1,
Wherein the plate member is a housing of a display panel or an electronic device. Disposing a plurality of exciter groups at a plurality of positions near the periphery of the plate-shaped member; And
Vibrating the plurality of exciter groups at substantially the same excitation frequency to excite the plate member,
Wherein the step of exciting the plate-like member excites a local region of the plate-like member and suppresses vibration of the plate-like member except the local region. 12. The method of claim 11,
Wherein the local region is excited with a vibration energy greater than the vibration tactile threshold value and the remaining region of the plate member excluding the local region is excited with a vibration energy smaller than the vibration tactile threshold value. 14. The method of claim 13,
The local region is excited with a vibration energy of at least 2 dB or more than the vibration tactile threshold value and the remaining region of the plate member excluding the local region is excited with a vibration energy of substantially 2 dB or less than the vibration tactile threshold value Method of forming local oscillation field. 12. The method of claim 11,
Wherein the localized region vibrates the plate-shaped member such that the localized region oscillates at a mid-to-low frequency band in an audible frequency band. 12. The method of claim 11,
Wherein the position of the local region of the plate-shaped member is set by controlling at least one of amplitude and phase of the plurality of vibrators. 12. The method of claim 11,
And exciting the plurality of exciters to cause a single-mode oscillation having a constant phase in the local region. A vibrator arrangement method for arranging vibrators exciting a plate-like member at a plurality of positions near the periphery of the plate-like member to vibrate a local area of the plate-like member,
Exciting a plurality of candidate positions in the vicinity of the periphery of the plate-shaped member at the same excitation frequency;
Calculating a correlation of vibrations at the plurality of candidate positions with respect to local oscillations of the plate member to select candidate positions that are relatively independent of the local oscillation of the plate member; And
And arranging the groups in the selected independent candidate positions. 19. The method of claim 18,
Wherein the correlation of the vibrations at the plurality of candidate positions to the local oscillations of the plate member is calculated using an effective independence method (EfI). 19. The method of claim 18,
Wherein candidate positions that are relatively independent of local oscillation of the plate member are selected based on an achievement value set based on human tactile information.

Images