KR102497962B1 - Horizontal linear vibration actuator having leakage magnetic flux shielding structure - Google Patents

Abstract

The present invention relates to a horizontal linear vibration actuator having a leakage magnetic flux shielding structure. Particularly, parts of a mobile apparatus are miniaturized and arrangement among the parts becomes dense and leakage of magnetic is minimized to prevent a magnetic field of an actuator from generating an interference problem in a mounting part, a stylus pen or the like so as to stably provide a variety of functions to the mobile apparatus through convergence.

Description

Horizontal linear vibration actuator having a leakage magnetic flux shielding structure

The present invention relates to a horizontal linear vibration actuator having a leakage magnetic flux shielding structure, and in particular, miniaturization of parts of a mobile device and dense arrangement between parts, and interference problems such as mounting parts and stylus pens in the actuator's magnetic field can be prevented. This is so that the leakage of magnetic flux can be minimized so that various functions can be stably provided to mobile devices through convergence.

Recently, with the rapid development of wireless communication technology, portable communication devices are gradually becoming smaller and lighter. In accordance with this trend of miniaturization and light weight, parts including mechanical devices, IC chips and circuits mounted inside portable communication devices are becoming highly integrated and highly functional. It has become necessary to evolve the size and shape to increase space utilization.

In addition, many studies are being conducted on a flat type vibration motor installed inside a portable communication device and notifying an incoming call with silent vibration in line with the aforementioned trend.

Early models of vibration motors mounted inside portable communication devices were in the form of rotary vibration motors with a basic configuration of a stator and a rotor. These rotary vibration motors fix the shaft to the bracket of the stator and support the rotor on the shaft to rotate. In order to improve the vibration force, the volume of the rotor was increased or the number of rotations was increased to improve the vibration force, but there were limitations in miniaturization due to structural problems and many difficulties in generating high vibration. There was a problem that could not guarantee a lifespan of more than a certain period of time.

In order to improve the problems of the aforementioned rotary vibration motor, a vertical vibration actuator type vibration motor has recently been proposed.

The vertical vibration type actuator type vibration motor includes an upper case and a lower case that oppose each other, magnetic force generating means formed on at least one surface of the upper case and the lower case, a magnet for which an attractive or repulsive force acting opposite to the magnetic force generating means is applied, and a magnet A weight for weighting the vibration force while moving up and down to form a body, an elastic means for elastically supporting the weight located on the lower part of at least one of the upper and lower surfaces of the weight, and the other end of the elastic means at the upper part It comprises a fixing member for fixing to the case and the lower case.

Such a vertical vibration type actuator type vibration motor has the advantage of being able to extend its service life compared to a rotation type vibration motor, overcome size limitations, and obtain a fast response speed, and thus has been widely used recently.

However, in the case of a vertical vibration type actuator, vibration transmission power is good when mounted on a product and driven. Recently, many horizontal vibration actuators that vibrate horizontally have been developed to improve resonance noise, but as the size of a device to which the actuator is applied increases, it is difficult to express various haptic vibration effects.

In addition, in order to express various haptic vibration effects, there is a continuous demand for the development of a horizontal vibration actuator with a faster response speed and strong vibration force.

Publication No. 10-2010-0073301 (2010.07.01.)

The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a horizontal linear vibration actuator having a leakage magnetic flux shielding structure that increases electromagnetic field power and minimizes leakage flux.

In addition, an object of the present invention is to provide a horizontal linear vibration actuator having a leakage magnetic flux shielding structure that optimizes magnetic field efficiency and minimizes leakage flux once again.

The present invention for achieving the above object, the bracket 10 provided to shield the leakage magnetic flux;

an FPCB 20 provided above the bracket 10 to supply external power;

a yoke plate 30 fixed to the bracket 10, combined with the yoke shaft 40 to concentrate the electromagnetic field of the coil 50 and protecting the coil 50;

a yoke shaft 40 provided to concentrate the internal electromagnetic field of the coil 50, fix the coil 50, and maintain a distance between the yoke plates 30;

a coil 50 configured to generate a magnetic field by an external electric signal and generate vibration by interacting with the magnetic field of the magnet;

A first support 60 fixed to the spring 80 and additionally fixed to the weight 120 to support the spring 80 to prevent deformation and breakage of the spring 80;

a second support 70 fixed to the spring 80 and additionally fixed to the case 130 to support the spring 80 to prevent deformation and breakage of the spring 80;

a spring 80 connected to the case 130 and the weight 120 to amplify vibration and to determine a resonance frequency;

a side plate 90 provided to concentrate the magnetic field of the magnet, fix the side magnet 100, and shield leakage magnetic flux;

a side magnet 100 fixed to the side plate 90 as a permanent magnet, generating a magnetic field, and acting with the magnetic field of the coil 50 to generate left and right horizontal vibrations in the vibrating body;

An upper magnet 110 fixed to the upper plate 111 as a permanent magnet, generating a magnetic field, and acting with the magnetic field of the coil 50 to generate horizontal vibration in the vibrating body;

a weight 120 connected to the spring 80, amplifying vibration using the weight, and having a resonance frequency determined; and

By including the case 130 provided to form an outer shell to protect the vibrating body and shield leakage magnetic flux, it is configured to minimize leakage of magnetic flux and provide various functions to the mobile device stably through convergence.

Accordingly, the present invention is configured by including a magnetic material for the case and the bracket, thereby improving the electromagnetic force, improving the vibration force, and further improving the leakage magnetic flux shielding.

In addition, by being composed of a structure surrounding the upper magnet and the side magnet, the magnetic field efficiency is optimized, and the leakage magnetic flux can be further reduced by shielding the magnetic field escaping from the top and bottom.

1 is a perspective view showing a horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention in isolation.
Figure 2 is a cross-sectional view showing a horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention.
3 is an exemplary view showing the magnetic field distribution, direction, and electromagnetic field force in the horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention.
4 is an exemplary view showing the amount of leakage magnetic flux according to the existing structure and the structure of the present invention in the horizontal linear vibration actuator having the leakage magnetic flux shielding structure of the present invention.
Figure 5 is an exemplary view showing the shape and coupling state of the top plate and the side plate in the horizontal linear vibration actuator having a leakage magnetic flux shielding structure of the present invention.
6 is an exemplary view showing an assembly structure of a side magnet and a side plate in the horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention.
7 is an exemplary view illustrating distribution of a magnetic field and leakage flux in the case of a plate, a case, and a bracket of a non-magnetic material and a case of a magnetic material in the horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention.

Hereinafter, since the present invention can apply various transformations and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, it should be understood that this is not intended to limit the present invention to specific embodiments, and includes all transformations, equivalents, and substitutes included in the spirit and scope of the present invention.

These embodiments are provided to explain the present invention in more detail to those skilled in the art to which the present invention pertains. Therefore, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer explanation, and in describing the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description omit

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. Terms are only used to distinguish one component from another.

Terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present invention, terms such as "comprise" or "having" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

First, the present invention relates to a horizontal linear vibration actuator having a leakage magnetic flux shielding structure, and includes a bracket 10, an FPCB 20, a yoke plate 30, a yoke shaft 40, a coil 50, and a first support (60), second support 70, spring 80, side plate 90, side magnet 100, upper magnet 110, weight 120, and case 130, including at least one or more of can be configured.

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

Referring to Figures 1 and 2,

1 is a perspective view separately showing a horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention, and FIG. 2 is a cross-sectional view showing a horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention.

The horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention forms an outer frame to protect the vibrating body, fixes and supports the FPCB 20 and the yoke plate 30 Bracket provided to shield the leakage magnetic flux An FPCB 20 is provided at the top of (10) to supply external power.

To this end, it is preferable that the bracket 10 is made of a magnetic material to form a magnetic field loop in which leakage magnetic flux is shielded.

The yoke plate 30 is fixed to the bracket 10, is combined with the yoke shaft 40 to concentrate the electromagnetic field of the coil 50, and is provided to protect the coil 50, and the yoke shaft 40 ) is provided to concentrate the internal electromagnetic field of the coil 50, fix the coil 50, and maintain a distance between the yoke plate 30.

The coil 50 generates a magnetic field by an external electrical signal and interacts with the magnetic field of the magnet to generate vibration. The first support 60 is fixed to the spring 80, and the weight 120 ) is additionally fixed to support the spring 80 to prevent deformation and breakage of the spring 80, and the second support 70 is fixed to the spring 80 and additionally fixed to the case 130 It is provided to support the spring 80 to prevent deformation and breakage of the spring 80.

The spring 80 is connected to the case 130 and the weight 120 to amplify vibration and determine a resonance frequency, and the side plate 90 concentrates the magnetic field of the magnet and fixes the magnet. It is available.

The side magnet 100 is fixed to the side plate 90 as a permanent magnet, generates a magnetic field, and is provided to generate left and right horizontal vibrations in the vibrating body by acting with the magnetic field of the coil 50, and the upper The magnet 110 is a permanent magnet fixed to the upper plate 111, generates a magnetic field, and interacts with the magnetic field of the coil 50 to generate horizontal vibration in the vibrating body.

The weight 120 is connected to the spring 80, amplifies vibration using the weight, and is provided to determine a resonance frequency, and the case 130 forms an outer shell to protect the vibrating body from leakage. It is provided so that magnetic flux can be shielded.

To this end, it is preferable that the case 130 is made of a magnetic material to form a magnetic field loop in which leakage magnetic flux is shielded.

Referring to Figure 3,

3 is an exemplary view showing the magnetic field distribution, direction, and electromagnetic field force in the horizontal linear vibration actuator having a leakage magnetic flux shielding structure according to the present invention.

The leakage magnetic flux shielded by the bracket and the case of the horizontal linear vibration actuator having the leakage magnetic flux shielding structure according to the present invention is first, when the leakage flux is not shielded by the bracket and the case, the electromagnetic field force is 0.098 (N), and the leakage When the closed loop is formed by shielding the magnetic flux, it can be confirmed that the electromagnetic field force increases by 11.2% to 0.109 (N). In other words, when comparing the electromagnetic field forces of the case 130 and the bracket 10, the magnetic structure is a non-magnetic substance. By being formed about 11.2% higher than the structure, it is possible to improve the vibration force.

Referring to Figures 4 to 7,

Figure 4 is an exemplary view showing the amount of leakage flux according to the existing structure and the structure of the present invention in the horizontal linear vibration actuator having the leakage magnetic flux shielding structure of the present invention, Figure 5 is having the leakage magnetic flux shielding structure of the present invention It is an exemplary view showing the shape and coupling state of the upper plate and the side plate in the horizontal linear vibration actuator, and FIG. 6 shows the assembly structure of the side magnet and the side plate in the horizontal linear vibration actuator having the leakage magnetic flux shielding structure of the present invention. 7 is an exemplary view showing distribution of magnetic field and leakage magnetic flux in the case of non-magnetic and magnetic materials of the plate, case, and bracket in the horizontal linear vibration actuator having the leakage magnetic flux shielding structure of the present invention.

The side plate 90 of the horizontal linear vibration actuator having a leakage magnetic flux shielding structure of the present invention is provided with side electromagnetic field force increasing parts 902 on both left and right sides of the front side plate piece 901 that comes into contact with the front side of the side magnet 100 And, side leakage magnetic flux shielding parts 903 are included on both sides of the upper side of the front side plate piece 901.

The side electromagnetic field force increasing part 902 is provided to have the same shape as both sides of the side magnet 100, and further includes a magnetic field polarity interference part 902-1 spaced apart from the end of the side magnet 100 by a predetermined interval. provided as possible.

The magnetic field polarity interference part 902-1 includes a gap, which is a predetermined space, so that the magnetic field flow is more smooth while minimizing interference of magnetic field polarity by forming a gap in the side assembly part when assembling the magnet. it can be done At this time, it is preferable that the side magnetic flux leakage shielding part 903 is provided to have the same shape as the upper and lower surfaces of the side magnet 100 .

On the other hand, the upper plate 111 has the same area as the upper magnet 110, and plate leakage flux shielding parts 111-2 are provided on the upper and lower parts of the upper plate piece 111-1 in contact with the outer surface. It is preferable that the plate leakage shielding part 111-2 includes upper and lower wrapping plate pieces 111-21 having the same area in contact with the upper and lower surfaces of the upper magnet 110.

The horizontal linear vibration actuator having such a leakage magnetic flux shielding structure is 452.0 (Gauss) for the bracket and 464.9 (Gauss) for the case when there is no upper and lower magnetic shielding structure. The leakage magnetic flux of the bracket is 309.8 (Gauss) and the case is 378.3 (Gauss), which reduces the bracket by 31.46% and the case by 18.63%.

형태로 적용하고, 추가로 케이스와 브라켓을 자성체로 사용할 경우, 비자성체로 사용하는 구조보다 누설 자속량이 케이스쪽 방향 99.97%, 브라켓쪽 방향 99.78% 감소시키는 효과를 갖는다.On the other hand, in the case of non-magnetic materials of the case and bracket, the leakage flux is 378.3 (Gauss) and 309.8 (Gauss), and in the case of the case and bracket's magnetic material, the leakage flux is 0.1169 (Gauss) and 0.6913 (Gauss).

When applied in the form and additionally, when the case and bracket are used as a magnetic material, the leakage magnetic flux is reduced by 99.97% in the case-side direction and 99.78% in the bracket-side direction, compared to a structure using a non-magnetic material.

In the above, the present invention has been described based on what is shown in the drawings, but this is only exemplary, and various substitutions, modifications and changes are possible within the scope of the technical idea of the present invention, so the above-described embodiments and drawings It is not limited.

10: Bracket 20: FPCB
30: yoke plate 40: yoke shaft
50: coil 60: first support
70: second support 80: spring
90: side plate 100: side magnet
110: upper magnet 120: weight
130: case

Claims (9)

a bracket 10 provided to shield leakage magnetic flux;
an FPCB 20 provided above the bracket 10 to supply external power;
a yoke plate 30 fixed to the bracket 10, combined with the yoke shaft 40 to concentrate the electromagnetic field of the coil 50 and protecting the coil 50;
a yoke shaft 40 provided to concentrate the internal electromagnetic field of the coil 50, fix the coil 50, and maintain a distance between the yoke plates 30;
A magnetic field is generated by an external electrical signal, and is fixed to the coil 50 and the spring 80 provided to generate vibration by interacting with the magnetic field of the magnet, and is additionally fixed to the weight 120 to support the spring 80. a first support 60 provided to prevent deformation and breakage of the spring 80;
a second support 70 fixed to the spring 80 and additionally fixed to the case 130 to support the spring 80 to prevent deformation and breakage of the spring 80;
a spring 80 connected to the case 130 and the weight 120 to amplify vibration and to determine a resonance frequency;
a side plate 90 provided to concentrate the magnetic field of the magnet, fix the side magnet 100, and shield leakage magnetic flux;
a side magnet 100 fixed to the side plate 90 as a permanent magnet, generating a magnetic field, and acting with the magnetic field of the coil 50 to generate left and right horizontal vibrations in the vibrating body;
An upper magnet 110 fixed to the upper plate 111 as a permanent magnet, generating a magnetic field, and acting with the magnetic field of the coil 50 to generate horizontal vibration in the vibrating body;
a weight 120 connected to the spring 80, amplifying vibration using the weight, and having a resonance frequency determined; and
In the horizontal linear vibration actuator having a leakage magnetic flux shielding structure, characterized in that the vibrating body is protected by forming an outer shell and a case 130 provided to shield the leakage magnetic flux is included,
The side plate 90 is
a front side plate piece 901 in contact with the front side of the side magnet 100;
It is provided to have the same shape as both sides of the side magnet 100 provided on both left and right sides of the front side plate piece 901, but has a predetermined space spaced apart from the end of the side magnet 100 by a predetermined distance. 902-1) including a side electromagnetic field force increasing unit 902; and
A horizontal linear vibration actuator having a leakage magnetic flux shielding structure, characterized in that the side leakage magnetic flux shielding part 903 provided on both upper sides of the front side plate piece 901 is included.
delete delete delete delete delete According to claim 1,
The side leakage flux shielding part 903
Horizontal linear vibration actuator having a leakage magnetic flux shielding structure, characterized in that provided to have the same shape as the upper and lower surfaces of the side magnet (100).
According to claim 1,
The upper plate 111 is
an upper plate piece 111-1 having the same area as the upper magnet 110 and contacting an outer surface;
and
A horizontal linear vibration actuator having a leakage magnetic flux shielding structure, characterized in that a plate leakage magnetic flux shielding part (111-2) provided on the upper and lower parts of the upper plate piece (111-1) is included.
According to claim 8,
The plate leakage flux shielding part 111-2 is
A horizontal linear vibration actuator having a leakage magnetic flux shielding structure, characterized in that it includes upper and lower wrapping plate pieces (111-21) having the same area in contact with the upper and lower surfaces of the upper magnet (110).

Images