WO2015069014A1

WO2015069014A1 - Linear vibration generating device

Info

Publication number: WO2015069014A1
Application number: PCT/KR2014/010573
Authority: WO
Inventors: 심순구; 정영빈; 최남진; 이민구
Original assignee: 자화전자(주)
Priority date: 2013-11-07
Filing date: 2014-11-05
Publication date: 2015-05-14
Also published as: KR20150053106A

Abstract

The linear vibration generating device according to the present invention comprises: a fixed body comprising a coil that is on the top surface of a bracket; a vibrating body comprising a ring-shaped weight on the inner peripheral surface of which a stepped portion is formed, and a permanent magnet which is provided such that one surface of the stepped portion of the weight is covered; and an elastic member which is disposed between the fixed body and the vibrating body and which elastically supports the vibrating body, wherein the elastic member is formed so as to be directly fixed to the reverse side of the stepped surface to the side that the permanent magnet touches.

Description

Linear vibration generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear vibration generating device, and more particularly, to a linear vibration generating device which generates vibration by causing a repetitive vertical movement of a weight body by interaction between an electric field generated by a coil and a magnetic field caused by a permanent magnet. .

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, these technologies do not guarantee long lifespan, they are not responsive, and there are limitations in implementing various vibration modes, so that touch-type mobile phones aka 'touch phones' cannot meet the needs of consumers in a rapidly popularized trend. There is.

In order to solve such a problem, a linear vibration generator technology for generating vibration by linearly swinging a weight body has been proposed. The proposed linear vibration generator uses the interaction between the electric field generated by the coil and the magnetic field of the permanent magnet surrounding the coil so that the desired vibration can be generated by linearly swinging the weight body.

Korean Patent No. 1180486 (published Sep. 6, 2012, hereinafter referred to as a 'prior patent document') discloses a technique for generating vibration by linearly oscillating a weight body under the name of 'linear vibration motor'. . The technology proposed through the prior patent document is a technology that allows the device to be miniaturized while maintaining a stable operating characteristics by increasing the magnetic efficiency.

The linear vibrator shown in the prior patent document will be described in more detail with reference to FIG. 1.

Referring to FIG. 1, the linear weight body is largely divided into a vibrating body 115, a fixed body 110, and a

case

135 and 102. The vibrating body 115 is composed of a magnet 111 for forming a magnetic field and a weight body 112 surrounding the vibrating body, and the fixing body 110 is around the yoke 107 and the yoke 107 in the center of the lower case 102. It consists of the coils 106 arranged.

In the center of the upper surface of the lower case 102, a PCB 105 is disposed in electrical contact with the coil 106 to transmit an electrical signal provided to the outside to the coil, and the upper case 135 and the weight body 112 or An elastic member 120 is interposed between the lower case 102 and the weight body 112 to elastically support the vibrating body 115 and to limit the amplitude to a predetermined width.

In order to increase the magnetic flux density through magnetic shielding, the permanent magnet is seated in a form in which one surface of the magnet is covered on a stepped portion (not shown) integrally formed on the inner circumferential surface of the weight body 112, and the vibrating body 115 of the The damper 140 is attached to one surface of the upper case 135 facing the upper surface to block the vibrating body 115 from contacting the case 135.

This prior art, the electric field generated by the fixture 110 and the magnet constituting the vibrating body 115 when the electrical signal (AC power) is input to the coil 106 through the PCB 105. By vibrating the vibrating body 115 up and down with respect to the fixed body 110 using the electromagnetic interaction generated between the magnetic field to generate a vibration.

However, the related art disclosed in the prior patent document has the following problems.

First, in fixing one end of the spring to the vibrating body by welding, directly welding the inner fixing end of the spring to the magnet may damage the magnetism of the magnet. As a result, there is a problem in that the gap between the outer fixed end of the spring connected to the case and the inner fixed end connected to the vibrating body is not sufficiently secured. That is, due to heat applied to the magnet during welding, cracks may be generated in the magnet or potatoes may be weakened in magnetic force.

Therefore, in order to enable the spring to exhibit the desired vibration characteristics within a limited range, the structure of the spring driving part (also called 'spring foot') was intricately constructed. There is a problem that is accompanied by difficulties in securing competitiveness in the.

Second, in the process of vibrating the vibrating body to generate vibrations, the outer edge of the vibrating body (see 'A' in the drawing) is formed by the left and right shaking, that is, the pitching movement, which occurs along with the vertical movement of the vibrating body. Due to the noise caused by the direct contact to the there is a problem that greatly reduces the quality and reliability of the product.

The problem to be solved by the present invention is to provide a linear vibration generating device that can simplify the pattern of the drive unit of the elastic member.

Another problem to be solved by the present invention is to implement a linear vibration generating device capable of effectively reducing the mechanical contact between the components due to the vibrating body pitching motion and the resulting noise.

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

A fixture including a coil seated on an upper surface of the bracket;

A vibrating body including an annular weight body having a stepped portion formed on an inner circumferential surface thereof, and a permanent magnet seated in a form in which one surface is covered on the stepped portion of the weighted body;

An elastic member disposed between the fixed body and the vibrating body to elastically support the vibrating body,

The elastic member provides a linear vibration generating device characterized in that the permanent magnet is fixed directly to the opposite side of the stepped surface in contact with the permanent magnet.

Here, the damping means is provided on at least one surface of the permanent magnet exposed surface of the opposite side of the step or the fixed body facing the exposed surface, it may further include.

In this case, the damping means provided on the exposed surface of the permanent magnet may include a magnetic fluid.

In addition, the inner circumferential surface of the step may be configured to protrude further into the inner circumferential surface of the permanent magnet or be located on the same line as the inner circumferential surface of the permanent magnet.

Preferably, the fixed end inner circumferential surface of the elastic member in contact with the step may be configured to be aligned with the inner circumferential surface of the step.

In the embodiment of the present invention, the fixing body may further include a case of a magnetic material that is coupled to the bracket to form an inner space for mounting the vibrating body and the elastic member.

In addition, the fixing body may further include a yoke fixed to the bracket and mounted to the inner diameter of the coil.

In this case, the yoke may be a cylindrical magnetic material having a T-shaped or + -shaped cross section.

In addition, the other end (outside fixing end) of the elastic member may be fixed to the upper surface of the bracket or the case facing the opposite side of the step surface that the permanent magnet is in contact.

As another preferred embodiment of the present invention, it may further include a pitching impact preventing means disposed on the fixture to face the weight on the opposite side of the step.

In this case, the weight upper edge or the corner may further include a recess formed to correspond to the pitching impact preventing means.

According to an embodiment of the present invention, by forming a structure in which the elastic member is directly fixed to the opposite side of the stepped surface that the permanent magnet is in contact, the gap between the outer fixing end and the inner fixing end of the elastic member respectively connected to the case and the vibrating body It can be sufficiently secured, and the length of the spring driving part ("spring foot") connecting the outer fixed end and the inner fixed end can be sufficiently extended.

That is, it is possible to implement an elastic member capable of exhibiting the desired vibration restoring force without constructing the structure of the spring driving unit (aka 'spring foot') in a complicated form as in the prior art. We expect the company to secure price competitiveness by improving mass production and reducing overall production costs.

In addition, the stepped body is integrally formed on the weight body to cover one surface of the permanent magnet, and at the same time, the case is made of a magnetic material, so that the vibration is effective without the plate generally applied in other conventional arts to concentrate the magnetic flux of the permanent magnet. It is possible to implement a vibration generating device that can exhibit performance, and can eventually achieve device miniaturization with improved performance.

In addition, the pitching impact prevention means disposed on one surface of the case facing the outer edge of one side of the weight body can reduce mechanical contact between the components (weight and stationary body) due to the vibrating body pitching motion and the noise thereof. As a result, it is possible to implement a high-quality vibration generator with high reliability that can exhibit a stable vibration characteristics.

1 is a cross-sectional view of a linear vibration generating device according to the prior art.

2 is an exploded perspective view of a linear vibration generating device according to a first embodiment of the present invention.

3 is a cross-sectional view of the linear vibration generating device shown in FIG.

4 is a sectional view showing a modification according to the first embodiment of FIG.

5 is a cross-sectional view showing another modification according to the first embodiment of FIG.

6 is an exploded perspective view of a linear vibration generating device according to a second embodiment of the present invention.

7 is a cross-sectional view of the linear vibration generating device shown in FIG.

8 is a cross-sectional view showing a modification according to the second embodiment of FIG.

9 is a sectional view showing another modification example according to the second embodiment of FIG.

10 and 11 are combined cross-sectional views of the linear vibration generating device according to the third and fourth embodiments of the present invention, respectively.

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

FIG. 2 is an exploded perspective view of the linear vibration generating device according to the first embodiment of the present invention, and FIG. 3 is a sectional view of the linear vibration generating device shown in FIG. The overall configuration of the linear vibration generating device according to the present invention will be described first with reference to these drawings.

2 to 3, the linear vibration generating apparatus according to the present invention is largely composed of a vibrating body 10 and the fixed body 20. An elastic member 40 is interposed between the vibrating body 10 and the fixed body 20 to elastically support the vertical movement of the vibrating body 10, and vibrates on the plate-shaped bracket 34 constituting the fixed body 20. The PCB 50 is provided to provide the AC power for generation to the fixture 20.

The vibrating body 10 is composed of a permanent body 12 to form a magnetic field and a weight body 13 combined with a form surrounding the outer edge of the permanent magnet 12 to impart a weight. The fixed body 20 is mounted on the bracket 34, a cylindrical coil 22 seated on an upper surface of the bracket 34 and disposed in the center of the permanent magnet 12, and mounted on an inner diameter portion of the coil 22. It consists of the yoke 24 and the case 30.

The coil 22 is electrically connected to the PCB 50 disposed on the bracket 34 to receive an electrical signal to vibrate the vibrating body 10 with respect to the fixture 20, and to receive the received electrical signal. The vibrating body 10 moves up and down with respect to the fixed body 20 by the attractive force and the repulsive force between the electric field generated by the coil 22 and the magnetic field generated by the permanent magnet 12. Move to generate vibration.

The amplitude of the vibrating body 10 in the case 30 may be limited to an appropriate range by the elastic modulus of the elastic member 40 and the attractive force acting between the permanent magnet 12 and the yoke 24. The permanent magnet 12 may be an annular shape, that is, a donut-shaped magnet having an inner diameter such that interference with the yoke 24 is not generated and having polarities opposite to each other in the vertical direction.

The amplitude of the vibrating body 10 may be limited to an appropriate range by the elastic modulus of the elastic member 40 and the attractive force acting between the permanent magnet 12 and the yoke 24, the permanent magnet ( 12 may be formed in an annular shape, that is, a donut shape, having an inner diameter such that interference with the yoke 24 does not occur, and having a polarity opposite in the vertical direction.

The yoke 24 may be provided in the form of a cylinder having a simple cylinder or a plate-shaped shield covering the upper portion of the coil 22 in a T-shaped or + -shaped cross section. In particular, the magnetic flux generated from the permanent magnet 12 is concentrated to the coil 22 wound around the outer edge of the magnetic material, and the attraction force is formed with the permanent magnet 12 to form an amplitude of the vibrating body 10. It plays a role of limiting.

Considering the effect of the magnetic flux concentration through the magnetic shielding or the weight reduction aspect, it is preferable to configure the yoke in a T-shape, and the ease of assembly in view of the yoke holding aspect in the process of moving the yoke, which is provided in a relatively small size, to an assembly target part. Considering this, it is advantageous to construct a + shape.

A stepped portion 16 is formed on the inner circumferential surface of the weight body 13, and the stepped portion 16 is seated in a form in which one surface of the permanent magnet 12 is covered. In the first embodiment, the step 16 is disposed to be deflected below the inner circumferential surface of the weight 13 so as to completely cover the lower surface of the permanent magnet 12 and to seat the permanent magnet 12.

The weight body 13 cannot form a magnetic path made of a non-magnetic material with a tungsten alloy, but by adding Fe particles to the tungsten alloy to have magnetic properties, the magnetic shield functions to concentrate the magnetic flux of the permanent magnet 12 toward the coil 22 side. Can also be provided.

Step 16 is provided integrally on the inner circumferential surface of the weight body 13 to vibrate up and down with the permanent magnet 12, the weight body 13 when the vibrating body 10 vibrates in the vertical direction, vibrating The elastic member 40 is disposed between the sieve 10 and the bracket 34 to elastically support the up and down vibration of the vibrating body 10 with respect to the fixed body 20 and to limit the amplitude thereof.

The elastic member 40 elastically supports the vibrating body 10 composed of the permanent magnet 12 and the weight body 13 vibrating up and down to restore the elastic force for restoring the position of the vibrating body 10 with respect to the fixed body 20. At the same time, the vibration of the vibrating body 10 is limited to the amplitude of the vibrating body 10 consisting of the permanent magnet 12 and the weight body 13 to collide with the case 30 constituting the fixed body 20 prevent.

One end (inner fixing end, 44) of the elastic member 40 is directly fixed to the opposite side of the surface of the step 16 in contact with the permanent magnet 12, the other end (outer fixing end, 42) is the bracket 34 A) The upper surface is fixed by welding to the edge. Of course, in the structure in which the stepped jaw is disposed above the permanent magnet (second embodiment to be described later), one end and the other end of the elastic member are fixed to the top step and the upper case facing the upper step.

When the inner circumferential surface I3 of the inner fixing end 44 of the elastic member 40 directly in contact with the step 16 is aligned with the inner circumferential surface I2 of the step 16, elasticity in a limited space is achieved. The length of the driving unit (aka 'spring foot', 43) of the elastic member connecting the outer fixing end 42 and the inner fixing end 44 of the member 40 can be made as long as possible to simplify the pattern of the driving unit 43. Can be.

The case 30 constituting the fixed body 20 is combined with the bracket 34 to form an inner space in which the vibrating body 10 and the elastic member 40 may be mounted. In the embodiment of the present invention, the case 30 is not particularly limited as long as it is a magnetic material (eg, a metal material), and has a width and a height capable of mounting a vibrating body, an elastic member, and a coil. Can be formed.

The PCB 50 inputs an electrical signal provided from the outside to the coil 22 and is electrically connected to the coil wire drawn out from the coil 22 for this purpose. The PCB 50 is provided in an annular shape as shown in FIG. 2 so that the yoke 24 mounted in the coil 22 and the coil inner diameter portion directly contacts the bracket 34 or the base 34 therein. It can be fixed in the form of being coupled to the central coupling hole.

In order to prevent direct contact between the vibrating body and the case when the vibrating body 10 oscillates up and down, in the first embodiment, the exposed surface of the permanent magnet 12 opposite to the surface contacting the step 16. It is provided with a damping means (60-1). In the present embodiment, the damping means may be a magnetic fluid, and the positional contact is suppressed by directly contacting the magnet exposed surface.

As shown in FIG. 4 showing a preferred modification according to the first embodiment of FIG. 3, the damping means 60-2 has a case 30 in which the exposed surface of the permanent magnet 12 opposite to the step 6 faces. It may be a configuration attached to one side of the). In this case, the damping means 60-2 may include a damper made of rubber, silicon, and porous rubber.

As shown in another modification of FIG. 5, damping means 60-3 and 60-both on the exposed surface of the permanent magnet 12 opposite the step 16 and on one surface of the upper case 32 facing the exposed surface. 4) may be provided. In this case, it is preferable that a magnetic fluid is used for the damping means 60-3 of the exposed surface, and a damper made of rubber or silicon is used for the damping means 60-4 of the surface facing the exposed surface.

In the first embodiment of FIGS. 2 to 5, the reference numeral 70 is disposed on the bracket 34 inside the elastic member 40 so that the elastic member 40 and the bracket are elastically deformed during the vertical movement of the vibrator 10. 34) As a shock absorbing material to prevent mechanical contact between the materials, a material capable of absorbing / mitigating the impact when the vibrating body 10 is touched, for example, rubber, silicone, and porous rubber ) May be used.

FIG. 6 is an exploded perspective view of the linear vibration generating device according to the second embodiment of the present invention, and FIG. 7 is a cross-sectional view of the linear vibration generating device shown in FIG. 6.

In the linear vibration generating device according to the second embodiment of FIGS. 6 and 7, unlike the linear vibration generating device of the first embodiment, the step 18 is disposed to be deflected above the inner circumferential surface of the weight body 13. The permanent magnet 12 is seated so that the upper surface is covered, and the elastic member 40 is directly fixed to a surface opposite to the stepped surface where the permanent magnet 12 is in contact (in the figure, the upper step side of the vibrating body).

That is, the second embodiment of FIGS. 6 and 7 is configured such that the upper surface of the step 18 faces one surface of the upper case 32 by inverting the vibrating body 10 of the case of the first embodiment up and down. The elastic member 40 is positioned between the case 18 and the case 30, and the exposed surface of the permanent magnet 12 opposite the step 18 is directed toward the bottom of the case, that is, the bracket 34.

Except that the vibrating body 10 and the elastic member 40 in the case is upside down, there is no significant difference from the configuration of the first embodiment described above, the same as the first embodiment in the following description of the second embodiment The same components will be given the same reference numerals while the detailed description thereof will be omitted, and only the components different from those of the first embodiment will be described briefly.

6 to 7, in the linear vibration generating device according to the second embodiment, the step 13 formed on the inner circumferential surface of the weight 13 completely covers the upper surface of the permanent magnet 12. The permanent magnet 12 is fixed to the inside seat. And the elastic member 40 is disposed between the step 18 and the case 30 to elastically support the vertical vibration of the vibrating body 10.

Step 18 is formed integrally projecting on the inner peripheral surface of the weight body 13 as in the first embodiment by vibrating together with the permanent magnet 12 and the weight body 13 during the vertical vibration of the vibrating body 10 The inner circumferential surface I2 may further protrude into the inner circumferential surface I1 of the permanent magnet 12 or may be provided in the same longitudinal direction as the inner circumferential surface I1 of the permanent magnet 12.

One end (inner fixing end, 44) of the elastic member 40 is directly fixed to the opposite side of the step 16 faced by the permanent magnet 12, and the other end (outer fixing end, 42) of the opposing part is the case 30. ) It is fixed on one side.

As in the first embodiment, when the inner circumferential surface I3 of the inner fixing end 44 of the elastic member 40 in contact with the step 18 is aligned with the inner circumferential surface I2 of the step 18, the outer side The length of the driving unit (aka 'spring foot', 43) of the elastic member connecting the fixed end 42 and the inner fixed end 44 can be made as long as possible in a limited space to simplify the elastic member.

On the exposed surface of the permanent magnet 12 opposite to the surface in contact with the step 18, that is, the upper surface of the permanent magnet, the mechanical contact between the upper portion of the vibrating body 10 and the case 30 when the vibrating body 10 moves up and down is prevented. Damping means (80-1) is provided. In the second embodiment, the damping means 80-1 may be a magnetic fluid, and a central portion contacting the case may be provided in a convex form.

As in the modification of FIG. 8, the damping means 80-2 is a rubber or silicon attached to one surface of the case 30 facing the permanent magnet exposed surface opposite to the surface facing the step 18. A damper made of a porous rubber material, or as shown in another modification of FIG. 9, on both the exposed surface of the permanent magnet 12 on the opposite side of the surface in contact with the step 18 and on one surface of the case facing the exposed surface. It may be arranged.

In the case of another modification as shown in FIG. 9 in which damping means 80-3 and 80-4 are provided on both the exposed surface of the permanent magnet 12 and the upper surface of the case 30 facing the permanent magnet 12, the first embodiment described above. Similarly, magnetic fluid may be used for the damping means 80-3 provided on the exposed surface, and the damping means 80-4 provided on one surface of the case 30 facing the exposed surface may be made of rubber or silicon. It may be a damper.

According to the first and second embodiments of the present invention, by forming a structure in which the elastic member is directly fixed to the opposite side of the step surface that the permanent magnet is in contact, the outer fixed end and the inner side of the elastic member connected to the case and the vibrating body, respectively The gap between the fixed ends can be sufficiently secured, and the length of the spring driving unit (also known as a 'spring foot') connecting the outer fixed end and the inner fixed end can be sufficiently increased.

The linear vibration generators according to the third and fourth embodiments shown in FIGS. 10 and 11 are opposite to the

step

16 and 18, in addition to the linear vibration generators according to the first and second embodiments described above, respectively. By providing pitching impact preventing means (90, 92) on the fixing body (20) facing the weight body 13 of the, it is possible to prevent the impact due to the pitching (pitching) movement of the vibrating body (10) It is characteristic.

In the third and fourth embodiments, preferably, one side edge or corner of the weight 13 further includes

recesses

14 and 15 adapted to correspond to the pitching impact preventing means 90 and 92. The application of the

recesses

14 and 15 may solve the problem of amplitude loss due to the application of the pitching impact preventing means 90 and 92 in a limited space.

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.

The present invention can be used as a vibration generating device used as a receiving device in a portable terminal.

Claims

A fixture including a coil seated on an upper surface of the bracket;

A vibrating body including an annular weight body having a stepped portion formed on an inner circumferential surface thereof, and a permanent magnet seated in a form in which one surface is covered on the stepped portion of the weighted body;

An elastic member disposed between the fixed body and the vibrating body to elastically support the vibrating body,

An inner fixed end of one end of the elastic member is fixed directly to the opposite side of the stepped surface in contact with the permanent magnet.
The method of claim 1,

And a damping means provided on at least one surface of the permanent magnet exposed surface opposite to the stepped portion or one surface of the fixing body facing the exposed surface.
The method of claim 2,

The damping means provided on the exposed surface of the permanent magnet is a linear vibration generating device comprising a magnetic fluid.
The method according to claim 1 or 2,

And an inner circumferential surface of the stepped portion is further protruded into the inner circumferential surface of the permanent magnet or positioned on the same line as the inner circumferential surface of the permanent magnet.
The method of claim 4, wherein

The fixed end inner circumferential surface of the elastic member in contact with the step is aligned linearly with the inner circumferential surface of the step.
The method according to claim 1 or 2,

The fixture is,

Linear vibration generating device further comprises a case of a magnetic material coupled to the bracket to form an inner space for mounting the vibrating body and the elastic member.
The method of claim 6,

The fixture is,

And a yoke fixed to the bracket and mounted to the inner diameter of the coil.
The method of claim 7, wherein

The yoke is a linear vibration generating device, characterized in that the cylindrical magnetic material of the cross-section T-shaped or + -shaped.
The method according to claim 1 or 2,

The outer fixed end of the other end of the elastic member is a linear vibration generating device, characterized in that fixed to the upper surface of the bracket or the case facing the opposite side of the stepped surface facing the permanent magnet.
The method according to claim 1 or 2,

And a pitching impact preventing means disposed on the fixture so as to face the weight on the opposite side of the step.
The method of claim 10,

And a concave indentation formed at the edge or corner of the weight body to correspond to the pitching impact preventing means.