KR101163611B1

KR101163611B1 - Linear vibration generating device

Info

Publication number: KR101163611B1
Application number: KR20100121374A
Authority: KR
Inventors: 박봉주
Original assignee: 자화전자(주)
Priority date: 2010-12-01
Filing date: 2010-12-01
Publication date: 2012-07-09
Also published as: KR20120059882A

Abstract

Disclosed is a linear vibration generating device employed in a portable terminal. The disclosed linear vibration generating device includes a bracket, a stator including a coil and a first yoke fixed to the bracket; A vibrator disposed in and operated in the first yoke inner space; And an elastic body provided between the stator and the vibrator to support the vibrator, wherein the first yoke is hollow and accommodates the coil in the first yoke inner space.

Description

Linear Vibration Generator {LINEAR VIBRATION GENERATING DEVICE}

The present invention relates to a linear vibration generating device, and more particularly to a coin-type linear vibration generating device employed in a portable terminal.

In general, the linear vibration generating device used as a silent receiving device of a mobile terminal has a shorter stroke and a faster response time at start and stop than the conventional eccentric rotation type vibration generating device due to the elastic force of the elastic body. . Accordingly, there has been a response to the trend of touch response and rhythm mixing functions of portable terminals.

Such a linear vibration generating device is generally composed of a vibrator including a permanent magnet and a stator supporting the vibrator, and the interaction between an electromagnetic force generated by applying a current to a coil disposed in the stator and a magnetic circuit generated in the permanent magnet. In operation, the vibrator moves up and down to generate vibration.

A configuration of a conventional linear vibration generating device 10 will be described with reference to FIG. 1. As shown in FIG. 1, the conventional linear vibration generating device 10 includes a vibrator and a stator, and the vibrator includes a yoke 14 having a burring portion 141, a permanent magnet 15, and a weight body. 16, the stator includes an outer case 12, a bracket 11, and a coil 13;

The permanent magnet 15 is formed in a ring shape, the burring portion 141 is provided to extend downward from the center of the yoke 14, the weight 16 is provided on the outer peripheral surface of the permanent magnet (15). The permanent magnet 15 is disposed coaxially with the coil 13 to form a magnetic circuit together with the yoke 14. In addition, an elastic body 17 is provided between the vibrator and the bracket 11 to play a role of supporting the vibrator during operation. Reference numeral 18 denotes a plate and FPCB denotes a flexible circuit.

However, due to the portable characteristics of the portable terminal, the portable terminal main body drop phenomenon frequently occurs, the impact applied during the drop is transmitted to the linear vibration generator, and eventually the burring portion 141 to the coil 13 of the linear vibration generator. ) Or a coil breakage occurs frequently due to a collision with the permanent magnet 15.

That is, when the portable terminal falls, the linear vibration generating device causes a phenomenon in which the vibrator shakes left and right in addition to the up / down movement of the vibrator, and the movement of the vibrator collides with the coil, thereby causing a serious problem in that the coil is disconnected.

Accordingly, the present invention is to solve the above problems, the present invention is to provide a linear vibration generating device that has a structure to protect the coil when the portable terminal falls to solve the coil disconnection problem, increase the life of the product. .

In addition, the present invention is to provide a linear vibration generating device for improving the electromagnetic force generated by increasing the diameter size of the coil.

In addition, the present invention is to provide a linear vibration generating device consisting of a structure for fixing the yoke to the coil, the magnetic field characteristics are improved, the detent torque is generated, the residual vibration is reduced, the response characteristics are improved.

In addition, the present invention is to provide a linear vibration generating device that can prevent the coil disconnection, because the yoke installed in the outermost, the shock is transmitted before the coil when the portable terminal falls.

In addition, the present invention is to provide a linear vibration generating device that is configured in the shape that the yoke protects the coil to prevent the disconnection of the coil in advance.

Accordingly, the present invention is to solve the above problems, the linear vibration generating device according to the present invention, a linear vibration generating device, a bracket, a stator including a coil and a first yoke fixed to the bracket; A vibrator disposed in and operated in the first yoke inner space; And an elastic body provided between the stator and the vibrator to support the vibrator, wherein the first yoke is hollow and accommodates the coil in the first yoke inner space.

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As described above, the linear vibration generator according to the present invention is to protect the coil to prevent the coil disconnection in advance, the life of the product is increased, in particular, the electromagnetic force generated by the increase in the amount of winding of the coil was increased In particular, since one yoke is fixed, magnetic field characteristics are improved, and residual vibration is reduced and response characteristics are improved.

1 is a cross-sectional view showing the configuration of a linear vibration generating device according to a conventional embodiment.
2 is a cross-sectional view showing the configuration of a linear vibration generating device according to an embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the drawings. Like reference numerals refer to like elements.

Referring to Figure 2 will be described the configuration of the linear vibration generating device 20 according to an embodiment of the present invention. As shown in FIG. 2, the linear vibration generating device 20 according to the embodiment of the present invention includes a vibrator, a stator, and an elastic body 27. At this time, the vibrator is disposed and operated in the state accommodated inside the stator. An elastic body 27 provided between the stator and the vibrator elastically supports the entire weight of the vibrator.

The vibrator is disposed and operated in the inner space of the first yoke 24 described later. In addition, the linear vibration generating device 20 is configured such that the first yoke 24, which will be described later, is fixed to the stator side, and the second yoke 25, which will be described later, is provided on the vibrator side to vibrate. In addition, the vibrator is disposed in the coil 23 to be described later and is configured to vibrate.

The vibrator includes a permanent magnet M and a second yoke 25, and the stator includes an outer case 22, a bracket 21, a coil 23, and a first yoke 24. The stator and the vibrator are relative to each other, the stator means a portion fixed to the vibrator, and the vibrator means a portion vibrating with respect to the stator.

The stator includes an outer case 22 functioning as a housing, a bracket 21 coupled to a bottom of the outer case 22, a coil 23 and a first yoke 24 fixed to a predetermined position of the bracket 21. ). The coil 23 is electrically connected to the flexible circuit FPCB, and the flexible circuit FPCB is drawn out of the outer case 22.

The permanent magnet M is disposed inside the first yoke 24 to provide a magnetic circuit together with the first and second yokes 24 and 25 and to provide a vibration force together with the coil 23. In addition, the permanent magnet (M) is disposed to be completely accommodated in the inner space of the first yoke (24) and to be accommodated in the coil (23).

The first yoke 24 is made of a material capable of functioning as a magnetic body, is fixed to the bracket 21, and is a member for forming a magnetic circuit together with the permanent magnet (M). The first yoke 24 is formed of a hollow type (ring type), and is disposed in a state in which the coil 23 is completely accommodated in an inner space. The inner diameter surface of the first yoke 24 is disposed in contact with or in close proximity to the outer diameter surface of the coil 23. The first yoke 24 extends horizontally inward to cover an upper end 241 of a ring shape covering the upper end of the coil 23, and extends downward from the upper part 241, and extends an outer diameter surface of the coil 23. It is composed of a ring-shaped lower portion 242. The inner diameter surface of the upper portion 241 is disposed facing the outer diameter surface of the permanent magnet (M) there is a constant gap. In addition, the inner diameter of the upper portion 241 is configured to be equal to or smaller than the inner diameter of the coil 23. In addition, the first yoke 24 extends to the height of the permanent magnet M on the bracket 21.

The upper portion 241 is configured in a shape surrounding the upper end of the coil 23, the lower portion 242 is configured in a shape surrounding the outer peripheral surface of the coil 23, the first yoke 24 is the coil 23 It is responsible for the protection function.

The linear vibration generating device 20 is provided with a second yoke 25 on the upper surface of the permanent magnet (M). While the first yoke 24 is fixed, the second yoke 25 is movable, and receives a vibration force along with the vibrator to move about the vibration axis. The second yoke 25 is preferably composed of a disc or annular or ring shape. 2 shows a disc-shaped second yoke. The second yoke 25 is installed in parallel in such a manner that its bottom surface is attached to the upper surface of the permanent magnet (M). That is, since the second yoke 25 is made of metal, it is firmly attached by the magnetic force with the permanent magnet M. At this time, the outer diameter of the second yoke 25 is configured to be the same as the outer diameter of the permanent magnet (M).

The outer case 22 is a coin forming member of the linear vibration generating device 20 together with the bracket 21. The outer case 22 has a simple cover shape and may be magnetic or nonmagnetic.

The bracket 21 is a member coupled to the bottom of the outer case 22, and supports the entire weight of the vibrator together with the elastic body 27 when the vibrator vibrates.

The permanent magnet M has a ring shape, and has a top surface and a bottom surface, an outer diameter surface and an inner diameter surface, and a cylindrical inner space. It exists and is provided with the weight mentioned later in the said internal space.

In addition, the vibrator further includes a high specific gravity weight (W) in the inner space of the permanent magnet (M). The weight W is configured to fill the inner space of the permanent magnet (M). The inner diameter surface of the weight body (W) is disposed in surface contact with the outer diameter surface of the permanent magnet (M). The inner surface of the permanent magnet M may be provided with a nonmagnetic material so that the magnetic circuit of the linear vibration generator is concentrated toward the center. In particular, the outer diameter surface of the weight (W) is in contact with the inner diameter surface of the permanent magnet (M), the upper surface is made of a structure covered with the second yoke (25).

The elastic body 27 is disposed between the vibrator and the outer case 22, and in particular, between the second yoke 25 and the outer case 22 to support the vibrator. The elastic body 27 is a coil spring, and is configured in a shape that gradually increases in diameter as the upper end than the lower end, the upper end of the elastic body 27 is always maintained in close contact with the ceiling surface of the outer case 22, Always maintains a state in close contact with the upper surface of the second yoke 25 at all times.

In addition, in the present invention, the elastic body 27 is limited to being provided between the vibrator and the outer case 22, but the elastic body 27 is deformable by being disposed between the bracket 21 and the weight body (W). Do.

In addition, the bottom of the permanent magnet (M) is further provided with a ring-shaped plate 26. The plate 26 is mounted on the bottom surface of the permanent magnet M to face the bracket 21. The plate 26 is made of a metal material or a material acting as a magnetic material to form an external magnetic field leakage prevention and magnetic closure circuit. That is, since the plate 26 acts as a magnetic material, the magnetic circuit generated by the first yoke 24 and the permanent magnet M is concentrated toward the center of the coil 23. The plate 26 has an inner diameter portion provided in a circular or polygonal shape, the outer diameter portion may be configured to be the same or smaller than the outer diameter of the permanent magnet (M).

According to the above configuration, the linear vibration generating device according to the present invention is provided with a first yoke 24 at the outermost center with respect to the vibration axis A, and the coil 23 toward the inside of the first yoke 24. The vibrator, that is, the permanent magnet M, the weight body W, and the second yoke 25 are disposed in the inner space of the first yoke 24 and the coil 23. Accordingly, when the linear vibration generating device 20 operates, the vibrator, that is, the permanent magnet M, the weight body W, and the second yoke 25 are centered on the vibration axis A in the inner space. Moving up and down, the elastic body 27 elastically supports the vibrator in the vertical direction.

On the other hand, in the linear vibration generating device, since the components providing the magnetic circuit are located at the outermost side around the vibration axis A, the diameters of the first yoke 24 and the coil 23 are increased. The winding amount of the coil 23 is increased to increase the electromagnetic force.

In addition, the first yoke 24 is disposed in contact with the outer case 22 and the inner outer peripheral surface, the impact is transmitted first when the portable terminal falls, the first yoke 24 is attached to the bracket 21 As it is fixed, the first yoke 24 is also responsible for preventing the shock transmission of the components located in the interior space.

The upper collision prevention part 28 is further provided above the second yoke 25. The upper collision preventer 28 may be a magnetic fluid. In addition, a lower collision preventing part 29 is further provided on the bracket 21 in the coil 23 inner region. The lower collision prevention part 29 may be made of a material such as a sponge. The upper and lower collision avoiding portions 28 and 29 mainly serve to prevent a vertical collision.

The linear vibration generating device 20 arranges the first yoke 24 on the bracket 21 at the outermost side, and arranges the coil 23 in contact with the inner diameter surface of the first yoke 24. The permanent magnet M and the plate 26 are completely accommodated in the inner space of the first yoke 24, the weight body W is provided in the inner space of the permanent magnet M, and the coil 23 is provided. The upper and outer diameter surfaces of the first yoke 241 and the lower portion 242 is arranged in a structure that is arranged.

As a result, the coil 23 is protected by the upper part 241 and the lower part 242 of the first yoke fixed on the bracket to prevent the coil disconnection that frequently occurs when the upper mobile terminal falls. In particular, as the diameter of the coil 23 is larger than in the related art, the winding amount of the coil 23 is increased so that the electromagnetic force is improved, thereby improving vibration characteristics and response characteristics.

As shown by the thick arrows in FIG. 2, the magnetic circuits provided by the permanent magnets M and the first and second yokes 24 and 25 are formed in an approximately donut shape.

Claims

In the linear vibration generator,
A stator including a bracket, a coil fixed to the bracket, and a first yoke;
A vibrator disposed in and operated in the first yoke inner space; And
And an elastic body provided between the stator and the vibrator to support the vibrator, wherein the first yoke is hollow and accommodates the coil in the first yoke inner space.

The method of claim 1, wherein the vibrator
And a permanent magnet disposed in the coil to provide a magnetic circuit together with the first and second yokes and to provide a vibration force together with the coil.

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The linear vibration generating device according to claim 2, wherein the permanent magnet is disposed in a state accommodated in the first yoke and the coil inner space.

The method of claim 2, wherein the first yoke is
An upper portion of a ring shape extending inward to cover the top of the coil; And
Linear vibration generating device extending from the upper side to the lower side, characterized in that consisting of a ring-shaped lower portion surrounding the outer peripheral surface of the coil.

6. The linear vibration generating device according to claim 5, wherein the inner diameter surface of the upper portion is disposed facing the outer diameter surface of the permanent magnet so that a predetermined gap exists.

The linear vibration generating device according to claim 5, wherein an inner diameter of the upper portion is configured to be equal to or smaller than an inner diameter of the coil.

The linear vibration generator of claim 2, wherein the coil inner diameter surface and the permanent magnet outer diameter surface are disposed to face each other and have a predetermined gap.

The linear vibration generating device of claim 2, wherein the second yoke is made of a material that functions as a magnetic material, and is attached to an upper surface of the permanent magnet.

10. The linear vibration generating device according to claim 9, wherein the second yoke is configured in a disk shape or an annular shape.

The linear vibration generating device of claim 2, wherein a ring-shaped plate is further provided on the bottom surface of the permanent magnet, and the plate is completely accommodated in the inner space of the first yoke.

The linear vibration generating device according to claim 2, wherein a weight is provided in the inner space of the permanent magnet.

The linear vibration generating device according to claim 12, wherein the weight body has an outer diameter surface disposed in contact with the inner surface of the permanent magnet, and the upper surface covers the second yoke.

The linear vibration generating device of claim 2, wherein the first yoke extends to the height of the permanent magnet on the bracket.

The linear vibration generating device according to claim 2, further comprising an outer case coupled to the bracket, and an elastic body disposed between the vibrator and the outer case.

The linear vibration generating device of claim 2, wherein an upper collision prevention part is further provided on the second yoke.

The linear vibration generating device according to claim 1, further comprising a lower collision prevention part on the bracket inside the coil.

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