KR20180010288A - Linear Vibrator. - Google Patents

Abstract

The present invention relates to a linear vibration generator which provides a structure capable of fixing a ring-shaped coil and a yoke provided inside a linear vibration motor with a simple structure. More specifically, the linear vibration generator serves as a role of a center yoke by having a stepped part so that the shape of a bracket can protrude, is easy to manufacture by a simple structure, prevents the reduction of vibration power by occupying a small space, and minimizes the rise in material costs. The linear vibration generator is easily manufactured by being press-fitted into the bracket by using a press or deep drawing technique, fixes a coil by a stable structure, reduces production costs, satisfies the performance, and at the same time secures a work process and price competitiveness. The present invention comprises a case, a bracket, a stator, a vibrator, an elastic body, and an FPCB.

Description

Linear vibration generator. {Linear Vibrator.}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a linear vibration generating apparatus that provides a structure in which a ring-shaped coil and a yoke provided inside a linear vibration motor can be fixed with a simpler structure, and more particularly, A center yoke, and a linear vibration generator capable of minimizing an increase in material cost while preventing a reduction in vibration power due to the simplicity of the structure and the ease of manufacture and occupancy of a small space.

2. Description of the Related Art [0002] Recently, as the market and base of a mobile device have expanded, many technologies that can be implemented and implemented in mobile devices have been developed.

2. Description of the Related Art In recent years, mobile devices have tended to adopt a touch screen, and when touching a touch screen, it is common to use a haptic function that generates vibration.

As a result, the life of the vibration motor that generates vibration is important, and the thickness of the mobile device is gradually decreasing.

In addition, there is a need for a technique for ensuring the performance and cost competitiveness while realizing reduction in manufacturing cost by simplifying the assembling process by integrating the parts constituting the vibration motor and the linear vibrator as described above.

Specifically, in the conventional technique as in Patent Document 1, in addition to the bracket structure, a structure is provided in which a T-shaped yoke is additionally provided, so that the manufacturing process for the bracket and the construction in which the additional yoke is fixedly coupled to the bracket .

Accordingly, there is a problem that the manufacturing process is complicated, the manpower and the time required for the work are significantly increased, and the manufacturing cost is increased due to the increase of parts.

Therefore, by simplifying the bracket itself and ensuring the fixed structure of the coil by coupling with the yoke, the parts constituting the vibration motor and the linear vibrator are integrated to simplify the assembling process and realize a reduction in manufacturing cost It is necessary to have a technology that satisfies the performance and secures the work process and price competitiveness.

KR 1101330

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a fixing structure of a coil through a simple working process of a bracket itself, thereby stably fixing a coil provided in a space inside a case, The object of the present invention is to integrate the components constituting the linear oscillator to simplify the assembly process, to realize a reduction in the manufacturing cost, to satisfy the performance, and to secure the work process and cost competitiveness.

According to an aspect of the present invention, there is provided a linear vibration motor comprising: a casing having an inner space; a casing coupled to a lower portion of the casing to form an outer appearance of the linear vibration motor, A bracket 3 including a protruding portion 31 having a protruding and extending shape, a stator 4 provided on the protruding portion, one side fixed to the upper side of the bracket 3, It is possible to provide the linear vibration generating apparatus 1 including the elastic body 5 and the FPCB 6 fixed to the upper surface of the bracket 3 and performing an electrical connection function between the external device and the coil.

The stator 4 is fixed to the outer surface of the protrusion 31 by being inserted into the outer surface of the protrusion 31. The stator 4 includes a coil 41 provided not to be higher than the protrusion 31, It is preferable to include a yoke 42 provided at least one.

The yoke 42 has a donut shape and is inserted or fixed to the protrusion 31 or has a disc shape and is fixed or fixed to a concentric axis with the upper end of the protrusion 31, And a press-fitting groove 43 having a diameter equal to the diameter of the protruding portion is provided at the center of the protruding portion 31 and is fixed to the upper end of the protruding portion 31 with a concentric axis.

In this case, an iron core (a shaft) of a magnetic material may be inserted into the inner space of the protrusion 31 to improve the electromagnetic force.

The elastic body 5 may be provided not only in the bracket 3 but also in a structure in which one side is fixed to the inner side of the case 2 and the other side is coupled to the vibrator 7. [

Specifically, the vibrator 7 preferably includes a magnet 71, a weight 72, a magnetic fluid MF applied to an upper portion of the magnet 71, and a lower yoke 74.

That is, it is possible to provide a magnetic fluid damper of a circular shape by applying a magnetic fluid MF on the magnet 71.

Also. In this case, it is possible to further provide a film below the case 2 facing the magnetic fluid damper.

In this case, the magnet 71 may be provided in a structure in which one magnet, or two upper magnets 711 and two lower magnets 712 are combined.

It is preferable that the vibrator 7 further includes a center yoke 75 provided between the upper magnet 711 and the lower magnet 712.

In addition, a ring-shaped or disk-shaped damper 8 may be provided on one surface of the inner side of the case 2 where the elastic body 5 is provided or on the upper surface of the bracket 3.

The linear vibration generating apparatus of the present invention having the above-described structure can be easily manufactured by press-fitting into the bracket by using a press or deep drawing method, etc., and it is possible to fix the coil with a stable structure, It is possible to satisfy the performance, and at the same time to ensure the work process and price competitiveness.

1 is a cross-sectional view of a linear vibration generating device including a case and a protrusion of a bracket according to an embodiment of the present invention.
2 is a cross-sectional view of a linear vibration generator including a case and a protrusion of a bracket according to an embodiment of the present invention.
3 is a cross-sectional view of a linear vibration generating device including a case and a protrusion of a bracket according to an embodiment of the present invention.
4 is a cross-sectional view of a linear vibration generator including a case and a protrusion of a bracket according to an embodiment of the present invention.
5 is a cross-sectional enlarged view of a vibrator connected to an elastic body according to an embodiment of the present invention.
6 is a cross-sectional view of a linear vibration generator including a case, a center extension of a bracket, and a ring-shaped damper according to an embodiment of the present invention.
7 is a cross-sectional view of a linear vibration generating device including a case, a protrusion of a bracket, and a yoke provided on an upper side and a lower side of a coil according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

1 is a cross-sectional view of a linear vibration generating device including a case and a protrusion of a bracket according to an embodiment of the present invention.

The basic structure of the linear vibration generator 1 according to the present invention will be described in detail.

For reference, Fig. 1 shows only half of the linear vibration generating device 1 having a symmetrical structure, which is for clearly showing the internal structure of the linear vibration generating device 1. Fig. It should be understood, therefore, that the remaining half of the figures are to be understood to be symmetrical with respect to the structure shown, and that other shapes may likewise exclude symmetrical shapes.

1 is a perspective view illustrating a structure of a linear vibration generator 1 shown in FIG. 1; FIG. 2 is a perspective view of a linear vibration generator 1 shown in FIG. 1; ) Can be confirmed.

More specifically, it comprises a case (2) having an inner space, a bracket (3) coupled to the lower portion of the case (2) to form an outer surface of the linear vibration motor, and a protruding portion (31) The elastic member 5 has one side fixed to the upper side of the bracket 3 and the other side connected to the vibrator 7 and the other side connected to the upper side of the bracket 3, The linear vibration generating apparatus 1 including the FPCB 6 which is fixed and performs the function of electrically connecting the external device and the coil is shown.

The stator is fixed to the outer surface of the protrusion 31 by being inserted into the outer surface of the protrusion 31. The coil 41 is provided so as not to be higher than the height of the protrusion 31, And a yoke 42 provided on at least one of the yokes 42 and 43.

It is preferable that the protruding portion 31 is press-fitted inward by using a press or a deep drawing method, and a structure capable of stably fixing the coil 41 by a simple one- I can take it.

In addition, it is possible to generate an electromagnetic field in relation to the coil 41 without the necessity of separate yoke assembly, with the structure extending upwardly from the inside of the coil 41. [

Accordingly, it is possible to simplify the product structure by providing the coil 41 fixing structure through the simple pressing process, and to improve the productivity and reduce the manufacturing cost.

In this case, the coil 41 may have a ring shape and be fixed outside the bracket projecting portion 31 which is press-fitted in conformity with the coil size, but a separate material for adhesion may be provided outside the bracket projection 31 It would also be desirable to be fixed.

FIG. 2 is a cross-sectional view of a linear vibration generator including a case and a protrusion of a bracket according to an embodiment of the present invention. FIG. 3 is a perspective view of a linear vibration generating device including a case and a protrusion of a bracket, Fig.

The yoke 42 has a donut shape and is inserted and fixed to the protruding portion 31 (FIG. 1). The yoke 42 has a disk shape, and is concentric with the upper end of the protruding portion 31 (FIG. 3) in which a press-fitting groove 43 having a diameter equal to the diameter of the protruding portion is provided at the center and is fixed to the upper end of the protruding portion 31 with a concentric axis, .

With this structure, it is possible to easily and quickly install the yoke for amplifying the electromagnetic force without any additional processing, and it is possible to effectively install the yoke 42 and the coil 41 without additional components Lt; / RTI >

4 shows a cross-sectional view of a linear vibration generator including a case and a protrusion of a bracket according to an embodiment of the present invention.

According to this, the elastic body 5 is not necessarily provided on the upper surface of the bracket 3, and it is also possible to attach the elastic body 5 to the inner surface of the case 2, if desired.

In addition, a detailed description of the structure of the vibrator 7 of the above-described linear vibration generating apparatus 1 and the magnet 71 will be required.

5 is a cross-sectional enlarged view of a vibrator connected to an elastic body according to an embodiment of the present invention.

The vibrator 7 may include a ring-shaped magnet 71, a ring-shaped weight 72 coupled to the outer surface of the magnet, and a lower yoke 74 provided below the magnet .

Specifically, the weight 72 functions to assist the vibrating force of the vibrator 7 in accordance with the upward / downward motion, and the yokes 73 and 74 provided at the lower portion of the magnet 71 increase the electromagnetic force .

In this case, it is preferable that the magnet 71 is provided in a structure in which one magnet or two upper magnets 711 and two lower magnets 712 are coupled.

This is because, when two or more magnets 711 and 712 are added, it is possible to generate a stronger electromagnetic force.

The vibrator may further include a center yoke 75 provided between the upper magnet 711 and the lower magnet 712.

The yokes 73, 74, and 75 may be made of a magnetic substance, a semisynthetic substance, or a non-magnetic substance.

6 is a cross-sectional view of a linear vibration generator including a case, a center extension of a bracket, and a ring-shaped damper according to an embodiment of the present invention.

A ring-shaped or disk-shaped damper 8 may be provided on one surface of the inner side of the case 2 where the elastic body 5 is provided or on the upper surface of the bracket 3.

By adopting such a structure in which the damper 8 is provided, it is possible to prevent generation of a strong vibration force or breakage of the vibrator 7 and the elastic body 5 from impact due to fall of an electronic apparatus or the like.

7 is a cross-sectional view of a linear vibration generating device including a case, a protrusion of a bracket, and a yoke provided on an upper side and a lower side of a coil, according to an embodiment of the present invention

To be more specific, the coil 41 usually covers the outside of the protrusion 31 and is located down to the lower portion of the bracket 3. However, since the magnet 41 is disposed at two or more positions It is possible to limit the structure of the coil 41 of the protrusion 31 as shown in Fig. 8, and to position the yoke 42 at the top and bottom.

The feature of this is that when two or more magnets 71 are to be positioned above / below, two yokes 42 on the coil side relative to the magnet 71 will have approximately twice as much electromagnetic force as the magnet 71 Effect.

More specifically, as shown in FIG. 7, when the coil-side current is changed, each is changed to generate a force at two places, so that it is possible to transmit a larger force toward the magnet 71 side.

In addition, there is a feature that displacement limitation is possible.

Specifically, in the conventional structure, when the displacement of the magnet is maximized at the resonance point, displacement limitation is difficult and there is a problem that it collides with the case or the bracket.

In this case, a magnetic fluid (MF) is inserted in the magnet to limit the displacement, or a cushion is attached to limit the displacement.

However, when the upper / lower yoke 42 and the two or more magnets 71 are provided on the side of the protruding portion 31 of the present invention, the displacement is limited from the point where the N pole and the S pole exactly meet in each structure, It is possible to prevent the magnet 71 from colliding with the bracket 2 or the bracket 3.

In addition, there is a feature capable of preventing leakage magnetic flux to the outside of the vibration generator.

It is possible to form magnetic closed circuits in the order of the coil side yoke 42, the protruding portion 31, the coil side yoke 42 and the magnet 71 in the magnet 71 so that the magnetic flux leakage to the outside of the vibration generator There are few features.

The leakage flux has a bad influence on the peripheral devices affected by magnetism, and therefore, the advantages of the above-described configuration are remarkable.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention

And the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Linear vibration generator
2: Case
3: Bracket
4: Stator
5: Elastomer
6: FPCB
7: Oscillator
8: Damper
9: Film
10: magnetic fluid
31:
41: Coil
42: York
43: press-fit groove
71: Magnet
72: Weight
73: upper yoke
74: Lower yoke
75: Center yoke
711: Upper magnet
712: Lower magnet

Claims (10)

A case 2 in combination with the bracket to form an internal space in which at least the stator 4, the vibrator 7 and the elastic body 5 are accommodated;
A vibrator 7 and an elastic body 5 accommodating the stator 4, the vibrator 7 and the elastic body 5 in an inner space thereof, which is coupled to the lower portion of the case 2 to form the inner space together with the case 2, , A bracket (3) constituting an outer appearance of the bobbin, the bobbin (3) being provided at the center by a press or deep drawing method and including a columnar protrusion (31) protruding upward;
A stator 4 disposed around the circumferential protrusion 31;
A vibrator 7 including a magnet 71 disposed at an outer periphery of the stator 4 and a weight 72 coupled to an outer periphery of the magnet;
The bracket 3 is fixed to the upper side of the case 2 at a position where the case 2 and the bracket 3 are coupled with each other. An elastic body 5 provided with the vibrator 7 so that the vibrator 7 vibrates within a predetermined height range; And
And an FPCB (6) fixed to the upper surface of the bracket (3) to electrically connect the external device and the coil,
The stator (4)
And a yoke (42) disposed on the upper side of the coil (41), wherein the yoke (42) is disposed on the upper side of the coil (41)
The coil 41 is arranged not to be higher than the height of the protrusion 31,
The yoke 42 has a donut shape and a protrusion 31 of the bracket is inserted into the yoke 42 so that the inner diameter rim of the donut yoke 42 is tightly engaged with the outer circumferential surface of the protrusion 31, The height of the upper surface of the yoke 42 when viewed from a final position where the yoke 42 is coupled to the protrusion 31 is larger than the height of the upper surface of the yoke 42, Is not higher than the height of the highest position of the projecting portion (31)
Characterized in that the protruding portion (31) is clogged without being opened at the top of the top so that it can firmly hold the circumferential protruding portion.
The method according to claim 1,
And a lower yoke (74) is provided under the magnet (71).
A case 2 in combination with the bracket to form an internal space in which at least the stator 4, the vibrator 7 and the elastic body 5 are accommodated;
A vibrator 7 and an elastic body 5 accommodating the stator 4, the vibrator 7 and the elastic body 5 in an inner space thereof, which is coupled to the lower portion of the case 2 to form the inner space together with the case 2, , A bracket (3) constituting an outer appearance of the bobbin, the bobbin (3) being provided at the center by a press or deep drawing method and including a columnar protrusion (31) protruding upward;
A stator 4 disposed around the circumferential protrusion 31;
A vibrator 7 including a magnet 71 disposed at an outer periphery of the stator 4 and a weight 72 coupled to an outer periphery of the magnet;
One side of the bent portion of the case 2 is fixed to the lower side of the case 2 and the other side of the case 2 is provided with an elastic force having a predetermined height with respect to the one side, An elastic body 5 that engages with the vibrator 7 so as to vibrate; And
And an FPCB (6) fixed to the upper surface of the bracket (3) to electrically connect the external device and the coil,
The stator (4)
And a yoke (42) disposed on the upper side of the coil (41), wherein the yoke (42) is disposed on the upper side of the coil (41)
The coil 41 is arranged not to be higher than the height of the protrusion 31,
The yoke 42 has a donut shape and a protrusion 31 of the bracket is inserted into the yoke 42 so that the inner diameter rim of the donut yoke 42 is tightly engaged with the outer circumferential surface of the protrusion 31, The height of the upper surface of the yoke 42 when viewed from a final position where the yoke 42 is coupled to the protrusion 31 is larger than the height of the upper surface of the yoke 42, Is not higher than the height of the highest position of the projecting portion (31)
Characterized in that the protruding portion (31) is clogged without being opened at the top of the top so that it can firmly hold the circumferential protruding portion.
The method of claim 3,
And a lower yoke (74) is provided under the magnet (71).
The method according to claim 1 or 3,
The magnet (71)
Wherein the upper magnet (711) and the lower magnet (712) are coupled to each other.
6. The method of claim 5,
Further comprising a center yoke (75) provided between the upper magnet (711) and the lower magnet (712).
The method according to claim 6,
And a lower surface of the coil is disposed at a predetermined distance from an upper surface of the bracket.
8. The method of claim 7,
Wherein a yoke is disposed on an upper surface and a lower surface of the coil, respectively, and a yoke disposed on a lower surface is spaced apart from an upper surface of the bracket.
The method according to claim 1 or 3,
And an iron core of a magnetic material is inserted into the inner space of the protrusion (31).
The method according to claim 1 or 3,
A damper 8 in the form of a ring or disk provided on one inner surface of the case 2 to which the elastic body 5 is coupled or on the upper surface of the bracket 3 to which the elastic body 5 is coupled Characterized in that the linear vibration generating device (1)

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