KR20190121098A - Horizontal type linear vibration generating device - Google Patents

Abstract

A horizontal linear vibration generating device is disclosed. Vibration generating device according to the present invention, a stator including a case coupled to the bracket to form a mounting space therein, a yoke configured to surround the coil and the outer surface of the coil mounted on the circuit board of the upper surface of the bracket, the stator And a pair of springs configured to enclose and to elastically support the vibrator on both sides with respect to the first direction between the case and the vibrator, the vibrator oscillating in the case with respect to the first direction in interaction with the stator, The vibrator includes first and second magnet groups disposed opposite to a second direction orthogonal to the first direction about the stator, and a weight body disposed adjacent to the first and second magnet groups, The second magnet group has a central magnet magnetized so that the direction of the magnetic field is directed to the stator, and is connected to both sides of the central magnet and magnetized so that the direction of the magnetic field is directed toward the central magnet. And a pair of auxiliary magnets, and a pole face the auxiliary magnets and the central magnets of the pair of mutually facing a vehicular configuration that sloped.

Description

Horizontal type linear vibration generating device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal linear vibration generating device. In particular, a horizontal linear vibration generating device used in a mobile phone or the like, in which a vibrator oscillates in a horizontal direction by an interaction between an electric field generated by a coil and a magnetic field by a magnet, generates vibration Relates to a device.

In general, an eccentric rotation type vibration generating device has been commonly used as a vibration generating device used as a receiving device in a portable terminal. However, this technique does not guarantee long life, is not fast response, and has limitations in implementing various vibration modes. Therefore, there is a problem in that the touch-operated smart phone does not meet the demand of the consumer in a rapidly popularized trend.

One of the countermeasures against this is a linear vibration generator that generates vibration by linearly swinging the weight. The linear vibration generator basically uses a primary vibrometer. To this end, a coil-shaped elastic body and a coil for vibrating the weight body are provided, and the weight body vibrates according to a frequency response characteristic predetermined by the elastic modulus of the weight body and the elastic body with a current applied to the coil.

Such a conventional linear vibration generating device is driven by an operation principle of generating vibration by oscillating the weight body by Lorentz force generated between the coil and the fixed magnet. However, due to the structural limitations of the vibration generating device by Lorentz force, it is difficult to realize the characteristics such as the strength of vibration and the frequency band of vibration well.

In addition, in the conventional linear vibration generating apparatus, there is a limit to increase of the attenuation value, and structurally, due to the imperfection of the implementation of the magnetic closed circuit, the vibration force is reduced due to the leakage of a large amount of magnetic force lines and the reaction speed (responsiveness) is slow. As a countermeasure, there is a method of increasing the number of magnets or applying an additional shielding structure. However, in the miniaturization of devices, it is difficult to meet the market demand and the cost increases.

Korea Patent Registration No. 10-1250288 (registered on March 28, 2013)

The technical problem to be solved by the present invention is to improve the magnetic circuit structure of the permanent magnet so that the magnetic force is concentrated in the direction in which the electromagnetic force interaction is maximized, horizontal linear vibration improved performance, such as vibration characteristics and reaction speed (responsiveness) It is to provide a generator.

Another technical problem to be solved by the present invention is to provide a horizontal linear vibration generating device that can significantly reduce the external leakage magnetic flux without additional shielding structure by using the magnetic circuit characteristics according to the unique permanent magnet arrangement.

According to the embodiment of the present invention as a means for solving the problem,

A case which is coupled to the bracket to form a mounting space therein;

A stator including a coil mounted on a circuit board on an upper surface of the bracket and a yoke configured to surround the outer surface of the coil;

A vibrator configured to surround the stator, the vibrator having a linear movement in which a movement direction is periodically changed in a case along a first direction by interaction with the stator; And

And a pair of springs elastically supporting the vibrator on both sides with respect to a first direction between the case and the vibrator.

The vibrator includes a first and a second magnet group opposed to a second direction orthogonal to the first direction about a stator, and a weight body disposed adjacent to the first and second magnet groups,

The first and second magnet groups may include a central magnet magnetized so that the direction of the magnetic field is directed toward the stator, and a pair of magnetized pairs installed on both sides of the central magnet and magnetized such that the direction of the magnetic field is directed toward the central magnet. Including auxiliary magnets,

Provided is a horizontal linear vibration generating device, characterized in that the magnetic pole of the pair of auxiliary magnets and the central magnet inclined mutually inclined.

In the present invention, the central magnet may have an isosceles triangle shape in which the gap between the magnetic pole surfaces becomes narrower as it moves away from the stator.

In this case, the horizontal position of the vertex of the central magnet opposite the stator and the auxiliary magnet outer surface portion may be the same, or the vertex may be positioned closer to the stator than the outer surface portion.

On the contrary, the vertex of the central magnet opposite the stator may be configured to protrude further outward with respect to the second direction than the outer surface of the auxiliary magnet.

At this time, the length L2 of the side of the magnetic pole surface of the auxiliary magnet in contact with the central magnet is preferably at least 1/3 or more of the length L1 of the side of the magnetic pole surface of the central magnet.

In addition, the central magnet may have a conformal trapezoidal shape in which the gap between the magnetic pole surfaces becomes narrower as the central magnet moves away from the stator.

In this case, the horizontal position of the upper side and the auxiliary magnet outer surface of the central magnet opposite the stator may be the same, or the upper side may be configured to be closer to the stator than the outer surface.

On the contrary, the upper side of the center magnet opposite the stator may be configured to protrude further outward with respect to the second direction than the outer surface of the auxiliary magnet.

At this time, the length L2 of the side of the magnetic pole surface of the auxiliary magnet in contact with the central magnet is preferably at least 1/3 or more of the length L1 of the side of the magnetic pole surface of the central magnet.

The auxiliary magnets applied to the present invention (magnets connected to both sides of the central magnets) may be composed of two magnets divided on the basis of a magnetic pole boundary surface perpendicular to each other and symmetric to the magnetic pole surface.

Preferably, the auxiliary magnet, the first auxiliary magnet magnetized in contact with the central magnet and the direction of the magnetic field toward the central magnet, and provided to contact the first auxiliary magnet around the magnetic pole boundary and of the magnetic field The direction may be configured as a second auxiliary magnet that is opposite to the magnetic field direction of the central magnet.

The first direction, which is a term referring to a direction in the present invention, is a direction in which the vibrator vibrates in a case due to the interaction of a coil and a magnet, and the second direction may be a direction orthogonal to the first direction on a doyle plane. have.

In another aspect, the present invention may further include a pair of frames provided to mount the magnet group and the magnetic materials on the opposite side of the surface facing the stator, wherein the magnetic pole arrangement between the center magnet and the auxiliary magnets disposed adjacent to the frame side Magnetic shielding effect is exhibited according to the magnetic shielding is not required. Therefore, it is desirable to configure the frame with a nonmagnetic material that is advantageous in weight and cost reduction.

According to an embodiment of the present invention, due to the magnetic circuit characteristic (characteristic of increasing the magnetic force on the side facing the stator) exerted according to the unique permanent magnet array (Halbach array), the mutual force between the magnetic force of the magnet and the magnetic force of the coil Aspiration, repulsion and thrust can be improved. As a result, the effect of maximizing the vibration force of the vibration generating device and improving the reaction speed can be exerted.

In addition, due to different magnetic circuit characteristics (characteristics in which magnetic forces on the opposite side of the magnet surface facing the stator cancel each other due to mutual interference) among the magnetic circuit characteristics exhibited by the unique permanent magnet arrangement, This can significantly reduce the magnetic flux leaking into the furnace. As a result, there is an advantage in cost reduction and device miniaturization.

1 is a perspective view of a horizontal linear vibration generating device according to an embodiment of the present invention.
Figure 2 is an exploded perspective view of a horizontal linear vibration generating device according to an embodiment of the present invention.
3 is a cross-sectional view of the linear vibration generating device of FIG.
4 is a cross-sectional view of the linear vibration generating device of FIG.
5 is an enlarged structural view of a main part for explaining a magnetic circuit of a horizontal linear vibration generating device according to an embodiment of the present invention.
6 illustrates various modifications of a magnet group of structures in which magnetic force is increased on one side and canceled off on the other.
7 illustrates other various modifications of the magnet group.
8 illustrates yet another modification of the magnet group.
9 is experimental data showing the magnetic flux distribution and magnetic field strength of each region of a magnetic circuit generally applied to a conventional linear vibration generating device.
10 is experimental data showing the magnetic flux distribution and magnetic field strength of each region of the magnetic circuit applied to the linear vibration generating device according to the present invention.

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

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the invention. A singular expression includes a plural expression unless the context clearly indicates otherwise.

The terms "comprise" or "have" herein are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and that one or more other features It should be understood that it does not exclude in advance the possibility of the presence or addition of numbers, steps, operations, components, parts or combinations thereof.

In addition, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

In addition, the terms “… unit”, “… unit”, “… module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. Can be.

In addition, in the description of the present invention, the term “substantially” does not need to accurately achieve the recited characteristics, parameters or values, but includes tolerances, measurement errors, measurement accuracy limits and other elements known to those skilled in the art. It should be understood that the variation or change to be made and the characteristic to be excluded do not exclude the effect to be provided.

The present embodiments to be described below are applied to a "portable user device", and the portable terminal refers to a portable user device. However, this is only general terms, and the present embodiment is a mobile phone, a palm sized personal computer (PC), a personal communication system (PCS), a personal digital assistant (PDA), a portable PC. (HPC: hand-held PC), smart phone, wireless LAN (Local Area Network) terminal, laptop computer, netbook, tablet PC (tablet personal computer), etc. It should be understood that.

Therefore, the use of the term "portable user equipment" should not be used to limit the application of this embodiment to a particular type of device.

In the following description with reference to the accompanying drawings, the same components will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Prior to describing the present invention, a direction-related term to be used hereinafter will be defined as follows. In the following terminology, a first direction is defined as a longitudinal direction of the vibration generating device in the drawing, specifically, a direction in which the vibrator vibrates with respect to the stator, and the second direction is a direction perpendicular to the first direction on the same plane. It is defined as the width direction of the vibration generating device.

1 is a perspective view of a horizontal linear vibration generating device according to an embodiment of the present invention, Figure 2 is an exploded perspective view of the horizontal linear vibration generating device shown in FIG. 3 is a cross-sectional view of the linear vibration generator of FIG. 1 viewed from the line A-A, and FIG. 4 is a cross-sectional view of the linear vibration generator of FIG. 1 viewed from the line B-B.

1 to 4, a horizontal linear vibration generating device according to an embodiment of the present invention is largely composed of a vibrator 10 and a stator 20. Here, the stator and the vibrator are relative to each other, and the stator 20 means a portion fixed to the vibrator 10, and the vibrator 10 means a portion vibrating with respect to the stator 20.

The vibrator 10 is installed in the case 30 constituting the external appearance of the device and performs linear movement in which the movement direction is periodically changed with respect to the first direction by interacting with the stator 20. The vibrator 10 includes a pair of magnet groups 12A and 12B composed of a plurality of magnets, and a pair of magnetic bodies 13L and 13R provided on both sides of the magnet groups 12A and 12B for magnetic shielding and magnetic flux concentration. ) And weights 16L and 16R outside the magnetic bodies 13L and 13R.

The first linear motion of the vibrator 10 in the case 30 is amplified by the repulsive force of the springs 40L and 40R and at the same time limited to a certain width. In addition, a direct physical collision between the vibrator 10 and the case 30 is suppressed by the repulsive force of the springs 40L and 40R that limit the amplitude of the vibrator 10 to a predetermined distance, and the vibrator 10 is in an initial starting position. It is also possible to return to the spring due to the spring repulsive force.

The springs 40L and 40R may preferably be corrugated springs having a continuous corrugated structure in the first direction as illustrated in the drawings, but are not limited thereto. It is only necessary to have a structure capable of exerting elasticity that is tensioned / compressed in response to the linear movement of the vibrator 10 in the first direction, and the vibrator 10 is disposed between the case 30 and the vibrator 10 with respect to the first direction. It may be provided in a pair to elastically support.

The case 30 forms a closed mounting space for accommodating the vibrator 10, the stator 20, and the springs 40L and 40R together with the bracket 34 coupled to the bottom thereof. The case 30 may have a rectangular parallelepiped structure having a rectangular planar shape and an open lower portion as shown in the drawing. When the bracket 34 and the case 30 are formed of a magnetic material, the case 30 is driven by a magnetic flux concentration effect through magnetic shielding. Performance can be further improved.

The stator 20 is mounted on the bracket 34 and fixed in a structure located at the center of the mounting space. On the upper surface of the bracket 34 between the bracket 34 and the stator 20, the stator 20 generates vibration by interaction between the magnet constituting the vibrator 10 and the coil 22 of the stator 20. The circuit board 50 which supplies an alternating current from the exterior to the coil 22 which comprises the stator 20 specifically, is arrange | positioned.

The stator 20 includes the coil 22 mounted on the circuit board 50 on the upper surface of the bracket 34. In addition, the outer surface is provided with yokes 24L and 24R, which are magnetic bodies configured to surround the coil 22. The yokes 24L and 24R may be provided in pairs so as to have a symmetrical arrangement with respect to the first direction with respect to the center of the coil 22, and faces facing each other for the purpose of magnetic flux concentration It may be configured to contact each other.

Each of the yokes 24L and 24R may again be comprised of a yoke core 240 surrounded by a coil 22 and a yoke end 242 that defines a winding region of the coil 22. The stator 20 composed of the yokes 24L and 24R and the coil 22 may be installed to be positioned at the center of the mounting space in a state supported by the bracket 34 through the yokes 24L and 24R.

The yokes 24L and 24R serve to concentrate magnetic force lines generated when power is applied to the coil 22 in one direction. The magnets are alternately magnetized to the N pole and the S pole according to the direction of the power supply (AC current) applied to the coil 22. Accordingly, the vibrator 10 may perform linear movement in which the direction of movement is periodically changed in the case by interaction (gravity and repulsive force) with the magnet groups 12A and 12B of the vibrator 10 which will be described later.

More specifically, the coil 22 is electrically connected to the circuit board 50 on the bracket 34 so that an alternating current is supplied to the stator 20 to vibrate the vibrator 10. The vibrator 10 reciprocates horizontally in the first direction with respect to the stator 20 by the attractive force and the repulsive force between the electric field generated by the coil 22 from the signal and the magnetic fields of the magnet groups 12A and 12B. Vibration is generated by the movement.

The vibrator 10 includes a pair of magnet groups 12A and 12B for forming a magnetic field. Moreover, the pair of magnetic bodies 13L and 13R which comprise a magnetic circuit are provided. The pair of magnet groups 12A and 12B is fixed to the frame 14 so as to form an arrangement facing the second direction with the stator 20 therebetween, and the magnetic bodies 13L and 13R are partially part of each magnet group 12A. , 12B) are provided to face the first direction with respect to the stator 20 so as to contact both side portions.

A pair of weight bodies 16L and 16R is provided outside each of the magnetic bodies 13L and 13R. The main role of the weight body (16L, 16R) is to amplify the vibration force of the vibrator 10, in some cases the magnetic body (13L, 13R) made of a high specific gravity metal material or by increasing the thickness of the magnetic body (13L, 13R) may also be configured to serve as the weights 16L and 16R. In this case, the weights 16L and 16R may be omitted.

5 is an enlarged structural view of a main part for explaining a magnetic circuit of the horizontal linear vibration generating device according to an embodiment of the present invention.

Referring to FIG. 5, as described above, the vibrator 10 constituting the magnetic circuit includes a pair of magnet groups (hereinafter, referred to as 'first and second') that are disposed to face each other in a second direction with respect to the stator 20. Magnet groups 12A and 12B) and a pair of magnetic bodies (hereinafter, referred to as 'first') installed in the first direction about the stator 20 so that a part of the magnet groups 12A and 12B are in contact with both side portions of each magnet group. And second magnetic bodies 13L and 13R ').

Inside the vibrator plate represented by the first magnetic body 13L and the second magnetic body 13R, the first magnet group 12A composed of a plurality of permanent magnets is installed, and the first magnet group is centered on the stator 20. The second magnet group 12B is arranged in a structure symmetrical with 12A. In this case, each of the first and second magnet groups 12A and 12B includes one central magnet 120 and auxiliary magnets 122L and 122R that are disposed to be connected to both sides of the central magnet 120.

The central magnet 120 included in each of the first and second magnet groups 12A and 12B is magnetized so that the direction of the magnetic field is directed toward the stator 20, and the auxiliary magnets 122L and 122R are formed on the magnetic pole surface ( 121L and 121R are installed in contact with both sides of the central magnet 120 and magnetized so that the direction of the magnetic field is directed toward the central magnet 120, and the auxiliary magnets 122L and 122R and the central magnet 120 are mutually connected. Contacting magnetic pole surfaces 121L and 121R are formed to be inclined.

That is, the magnetization directions of the first and second magnet groups 12A and 12B may be perpendicular to each other in the magnetization direction of each of the central magnets 120 and the auxiliary magnets 122L and 122R installed at both sides of the central magnet 120. have. Preferably, the central magnet 120 may be a permanent magnet magnetized in a direction perpendicular to the second direction, and the auxiliary magnets 122L and 122R may be permanent magnets magnetized in a direction perpendicular to the first direction. In this case, the magnetic pole arrangements of the first and second magnet groups 12A and 12B may also be arranged in the opposite directions to the above-described directions.

More specifically, the central magnet 120 of each of the first and second magnet groups 12A and 12B has an N pole and a S pole opposite to the stator 20. The central magnet 120 The auxiliary magnets 122L and 122R, which are connected to both sides of the N, are arranged in such a manner that the polarity of the side contacting the magnetic pole surfaces 121L and 121R of the central magnet 120 is the N pole and the S pole is located on the opposite side. The magnetic poles of the central magnet 120 and the auxiliary magnets 122L and 122R may be perpendicular to each other in the overall magnetic pole arrangement.

As shown in FIG. 5, a magnetic circuit having a closed curve structure in which magnetic force line patterns are continuous in four arrow directions is formed as shown in FIG. 5, wherein the magnetic field direction of the central magnet 120 is directed toward the stator 20. The magnets 122L and 122R are directed toward the center magnet 120 so that the center magnet 120 pushes the magnetic flux of the auxiliary magnets 122L and 122R toward the stator side, thereby exerting an effect on one side of each magnet group 120A and 120B. The magnetic flux density increases and the magnetic flux density on the other side decreases.

That is, due to the Halbach array in which the magnetic field direction of the center magnet 120 faces the stator 20 and the magnetic field directions of the auxiliary magnets 122L and 122R face the center magnet 120, the opposite side of the stator 20 The magnetic flux density of the magnet face is canceled by the mutual interference between the lines of magnetic force according to the Halbach arrangement and greatly reduced, and the side magnetic flux density facing the stator 20 of each magnet group increases relatively.

As a result, the effect of increasing the strength of the magnetic force (magnetic force directed to the stator 20) on the side that substantially generates the vibration force through interaction with the stator 20 is obtained, and the magnet of the magnet that is increased in the direction of the stator 20 appears. As the interaction between the magnetic force and the magnetomotive force of the coil improves the suction, repulsion and propulsion of the stator 20 with respect to the vibrator 10, the vibration force can be maximized and the reaction speed (responsiveness) can be greatly improved.

In addition, on the opposite side facing the stator 20, the magnetic force is greatly weakened by the mutual interference between the lines of magnetic force according to the Halbach arrangement. As a result, magnetic shielding that prevents external leakage of magnetic fields is not required. Therefore, since the magnet 14 and the frame 14 for mounting the magnetic body inside do not have to be constituted by the magnetic material, it is possible to reduce the device weight and reduce the cost.

6 is a diagram illustrating various modifications of a magnet group having a structure in which magnetic force is increased on one side and canceled and reduced on the other side.

As shown in the modified example of FIG. 6, the central magnet 120 may be formed in an isosceles triangle shape in which a gap between the magnetic pole surfaces 121L and 121R in contact with the auxiliary magnet becomes narrower as it moves away from the stator 20. At this time, as shown in (a) and (b) of Figure 6, the vertex of the central magnet 120 opposite the stator 20 and the horizontal position of the outer surface of the auxiliary magnets (122L, 122R) is the same, or the vertex is the outer surface portion It may be configured to be closer to the stator 20.

As such, when the outermost surface or the edge of the central magnet 120 is at least equal to the horizontal position of the auxiliary magnets 122L and 122R, or located closer to the stator 20 than the outer surface, the magnetic force of the central magnet 120 is fixed to the stator. The effect of focusing more on (20) is expressed. Accordingly, the magnetic efficiency between the stator 20 and the vibrator 10 is increased, and the repulsive force is increased, so that the effect of further strengthening the vibration can be exerted.

As shown in the modified example illustrated in FIG. 6C, in contrast to the structures (a) and (b) described above, vertices of the central magnets 120 opposite to the stator 20 are formed of the auxiliary magnets 122L and 122R. When configured to protrude further outward with respect to the second direction than the outer surface portion, the magnetic poles (N pole) of the auxiliary magnets (122L, 122R) in contact with the central magnet 120 and the magnetic poles (S pole) of the vertex side central magnet 120 ), The magnetic field leaking to the outside can be effectively reduced.

As shown in FIG. 6C, in the configuration in which the vertices of the central magnets 120 opposite to the stator 20 protrude further to the outside than the outer surfaces of the auxiliary magnets 122L and 122R, the auxiliary magnets that contact the central magnets 120 are provided. The length L2 of the side of the magnetic pole face of the magnets 122L and 122R is at least 1/3 of the length L1 of the side of the magnetic pole face of the central magnet, thereby suppressing the leakage of magnetic flux while forming a smooth circulating magnetic force pattern in the magnetic circuit. It is preferable to.

7 illustrates another various modification of the magnet group.

As shown in the modified example of FIG. 7, the central magnet 120 may be formed in a substantially equilateral trapezoidal shape in which a gap between the magnetic pole surfaces 121L and 121R in contact with the auxiliary magnet becomes narrower as it moves away from the stator 20. Here, as shown in FIGS. 7A and 7B, the horizontal position of the upper side of the central magnet 120 and the auxiliary magnets 122L and 122R opposite to the stator 20 is the same, or the upper side is It may be configured to be located closer to the stator 20 than the outer surface portion.

As such, when the outermost surface of the central magnet 120 is configured to be at least equal to the horizontal position of the auxiliary magnets 122L and 122R, or closer to the stator 20 than the outer surface, the magnetic force of the central magnet 120 is stator. In this case, the magnetic efficiency between the stator 20 and the vibrator 10 may be increased and the repulsive force may be increased, thereby further enhancing the vibration.

As shown in the modified example illustrated in FIG. 7C, in contrast to the structures (a) and (b) described above, the outermost surfaces of the central magnets 120 opposite to the stator 20 are auxiliary magnets 122L and 122R. When configured to protrude further outward with respect to the second direction than the outer surface of the, the magnetic poles (N pole) of the auxiliary magnets (122L, 122R) in contact with the central magnet 120 and the magnetic poles (S) of the vertex side central magnet 120 The interaction of the poles (gravity) can increase the effect of reducing the leakage flux.

As shown in FIG. 7C, the upper side of the central magnet 120 opposite the stator 20 further protrudes outward from the outer surface portions of the auxiliary magnets 122L and 122R. The length L2 of the side of the magnetic pole face of the magnets 122L and 122R is at least 1/3 of the length L1 of the side of the magnetic pole face of the central magnet, thereby suppressing the leakage of magnetic flux while forming a smooth circulating magnetic force pattern in the magnetic circuit. It is preferable to.

FIG. 8 is a diagram illustrating another modification of the magnet group, and a plurality of magnet arrays constituting the magnet group may be configured as shown in FIG. 8. That is, the auxiliary magnets 122L and 122R (magnets connected to both sides of the central magnets) are divided on the basis of the magnetic pole boundaries D that are perpendicular to each other and that are symmetric to the magnetic pole surfaces 121L and 121R described above. It can be composed of two magnets.

Specifically, the auxiliary magnets 122L and 122R are in contact with the central magnet 120 through the magnetic pole surfaces 121L and 121R, and the first auxiliary magnets 122- magnetized so that the direction of the magnetic field is directed toward the central magnet 120. 1L and 122-1R and the first auxiliary magnets 122-1L and 122-1R around the magnetic pole boundary D, and the direction of the magnetic field is the same as that of the magnetic field of the central magnet 120. The second auxiliary magnets 122-2L and 122-2R may be opposite to each other.

According to such a configuration, as the second auxiliary magnets 122-2L and 122-2R are arranged in the direction of shortest path of the cyclic magnetic pattern of the closed loop structure in the magnetic circuit, the magnetic efficiency is further improved, and the center magnet Based on (120), the magnetic force canceling effect of the region opposite to the stator 20 is further increased by the mutually opposite directions of the two second auxiliary magnets 122-2L and 122-2R arranged in a symmetrical structure. The magnetic field leaking to the outside can be further reduced.

9 and 10 are experimental data showing the magnetic flux distribution in each magnetic circuit and the intensity of the magnetic field for each region, and FIG. 9 shows the magnetic flux distribution and the magnetic field strength of the magnetic circuit generally applied to a conventional linear vibration generator. 10 shows magnetic flux distribution and magnetic field strength of each region of a magnetic circuit applied to the linear vibration generator according to the present invention.

In each experimental data, the vertical axis and the horizontal axis represent the magnetic flux density and distance in the lower graph showing the strength of the magnetic field for each region in the magnetic circuit. At this time, 6.00 mm of the values on the horizontal axis representing the distance correspond to the center of the magnetic circuit (the center of the stator), and the lines of the nonlinear structure represented by ① and ② represent the change in the strength of the magnetic field in the inner and outer regions of the vibrator, respectively. Indicates.

Referring to the magnetic circuit of the conventional linear vibration generating device, in which the magnetic pole direction of the central magnet and the magnetic pole direction of the adjacent auxiliary magnets are simply perpendicular to each other, the section substantially affecting the vibration force generation as shown in FIG. In the graph below, as shown in the graph below, the magnetic flux density (1) of the inner region in the region corresponding to approximately 0.4 to 8.00 mm is not uniform.

In other words, the intensity (magnetic flux density) of the magnetic field in the section where the stator and the magnet face each other is not uniform. The force for moving the vibrator by the interaction between the stator and the vibrator is not uniform with respect to the vibration direction (first direction). This means that the overall driving performance such as maneuverability and responsiveness is poor.

In addition, in the conventional magnetic circuit (FIG. 9), when looking at the magnetic flux density (②) of the outer region of the vibration difference, the section corresponding to the region where the magnets of the stator 20 and the vibrator 10 overlap (similarly in the range of 0.4 to 8.00 mm) It can be seen that the magnetic flux density rapidly increases in the corresponding section). This means that the amount of magnetic flux leaking to the outside in the corresponding section is large, and if the amount of leakage magnetic flux is large, the magnetic loss is increased accordingly and the magnetic efficiency is lowered.

On the other hand, in the magnetic circuit of the linear vibration generating device according to the embodiment of the present invention, as shown in FIG. It can be seen that the magnetic flux density (①) of the inner region in the section corresponding to 4.00 to 8.00 mm is maintained uniformly.

In other words, the intensity (magnetic flux density) of the magnetic field in the section where the stator and the magnet face each other is different. The force that moves the vibrator by the interaction between the stator and the vibrator acts uniformly with respect to the vibration direction (first direction). This means that the overall driving performance, such as the maneuverability and response of the device can be interpreted to be significantly improved compared to the prior art.

In addition, when looking at the magnetic flux density (②) of the outer region of the vibrator in the magnetic circuit (Fig. 10) of the present invention, in the section corresponding to the region in which the stator and the magnet of the vibrator overlap (similar to the range of 4,000 ~ 8.00mm) It can be seen that the magnetic flux density remains close to zero level. This means that there is almost no external magnetic flux leakage in the corresponding section, which can be interpreted as having a clear effect in terms of magnetic shielding.

According to the present invention as described above, due to the magnetic circuit characteristics (characteristic that the magnetic force of the side facing the stator is increased) exhibited according to the unique permanent magnet array (Halbach array), the mutual force between the magnetic force of the magnet and the magnetic force of the coil Aspiration, repulsion and thrust can be improved. As a result, the effect of maximizing the vibration force of the vibration generating device and improving the reaction speed can be exerted.

In addition, due to different magnetic circuit characteristics (characteristics in which magnetic forces on the opposite side of the magnet surface facing the stator cancel each other due to mutual interference) among the magnetic circuit characteristics exhibited by the unique permanent magnet arrangement, This can significantly reduce the magnetic flux leaking into the furnace. As a result, there is an advantage in cost reduction and device miniaturization.

In the detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

10: vibrator
12 A, 12B: Magnet group
13L, 13R: magnetic material
14: Frame
16L, 16R: Weight
20: stator
22: coil
24L, 24R: York
30: case
34: bracket
40L, 40R: Spring
50: circuit board
120: center magnet
121L, 121R: magnetic pole surface
122L, 122R: Auxiliary Magnet
122-1L, 122-1R: First auxiliary magnet
122-2L, 122-2R: Second auxiliary magnet
240: yoke core
242: York End

Claims (14)

A case which is coupled to the bracket to form a mounting space therein;
A stator including a coil mounted on a circuit board on an upper surface of the bracket and a yoke configured to surround the outer surface of the coil;
A vibrator configured to surround the stator, the oscillator oscillating in the case with respect to a first direction in interaction with the stator; And
And a pair of springs elastically supporting the vibrator on both sides with respect to a first direction between the case and the vibrator.
The vibrator,
A first and a second magnet group disposed opposite to a second direction orthogonal to the first direction about the stator, and a weight body disposed adjacent to the first and second magnet groups,
The first and second magnet groups may include a central magnet magnetized so that the direction of the magnetic field is directed toward the stator, and a pair of magnetized pairs installed on both sides of the central magnet and magnetized such that the direction of the magnetic field is directed toward the central magnet. Including auxiliary magnets,
Horizontal linear vibration generating device, characterized in that the magnetic pole surface in contact with the pair of auxiliary magnets and the center magnet is inclined.
The method of claim 1,
The central magnet is a horizontal linear vibration generating device characterized in that it is formed in an isosceles triangle shape that narrows the gap between the magnetic pole contacting the pair of auxiliary magnets as the distance from the stator.
The method of claim 2,
A horizontal linear vibration generating device, characterized in that the vertex of the central magnet opposite the stator and the horizontal position of the auxiliary magnet outer surface are the same, or the vertex is located closer to the stator than the outer surface.
The method of claim 2,
The horizontal linear vibration generating device, characterized in that the vertex of the center magnet opposite the stator protrudes outward more in the second direction than the outer surface of the auxiliary magnet.
The method of claim 4, wherein
And the length L2 of the side of the magnetic pole surface of the auxiliary magnet in contact with the central magnet is at least one third or more of the length L1 of the side of the magnetic pole surface of the central magnet.
The method of claim 2,
The central magnet is a horizontal linear vibration generating device, characterized in that formed as a trapezoidal trapezoidal narrowing the gap between the magnetic poles in contact with the pair of auxiliary magnets away from the stator.
The method of claim 6,
A horizontal linear vibration generating device, characterized in that the horizontal position of the upper side of the central magnet opposite the stator and the auxiliary magnet outer surface is the same, or the upper side is closer to the stator than the outer surface.
The method of claim 6,
The horizontal linear vibration generating device, characterized in that the upper side of the center magnet opposite the stator protrudes outward more in the second direction than the outer surface of the auxiliary magnet.
The method of claim 7, wherein
And the length L2 of the side of the magnetic pole surface of the auxiliary magnet in contact with the central magnet is at least one third or more of the length L1 of the side of the magnetic pole surface of the central magnet.
The method according to any one of claims 1 to 9,
Each auxiliary magnet is a horizontal linear vibration generating device, characterized in that the magnetic pole direction is perpendicular to each other and is composed of two magnets divided on the basis of the magnetic pole boundary surface symmetrical with the magnetic pole surface.
The method of claim 10,
The auxiliary magnet,
A first auxiliary magnet in contact with the central magnet and magnetized such that a direction of a magnetic field faces the central magnet;
And a second auxiliary magnet provided in contact with the first auxiliary magnet around the magnetic pole boundary and having a direction of a magnetic field opposite to a direction of the magnetic field of the central magnet.
The method of claim 1,
The first direction is a direction in which the vibrator vibrates in the case due to the interaction of the coil and the magnet,
And said second direction is a direction orthogonal to said first direction on a doyle plane.
The method of claim 1,
And a pair of frames for mounting the magnet group and the magnetic bodies.
The method of claim 13,
Horizontal linear vibration generating device characterized in that the frame is composed of a non-magnetic material.

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