WO2015115754A1

WO2015115754A1 - Linear vibration motor

Info

Publication number: WO2015115754A1
Application number: PCT/KR2015/000732
Authority: WO
Inventors: 강승렬; 윤금영
Original assignee: (주)파트론
Priority date: 2014-02-03
Filing date: 2015-01-23
Publication date: 2015-08-06
Also published as: KR20150091700A

Abstract

A linear vibration motor is disclosed. A linear vibration motor according to the present invention comprises: a housing for forming an inner space; a stator coupled to the housing; a vibrator which vibrates by means of an electromagnetic force resulting from an interaction with the stator; and an elastic body having one end coupled to the inner side of one surface of the housing and the other end coupled to the vibrator, wherein the coupling portion of the one surface, to which the one end of the elastic body abuts and is coupled, is formed to protrude towards the inside of the housing relative to the other part of the one surface than the coupling portion, thereby forming a stepped portion.

Description

Linear vibration motor

The present invention relates to a linear vibration motor.

The vibration motor is an electronic component that generates vibration by electromagnetic force between the stator and the vibrator, and is generally used for a notification such as a portable terminal. Vibration motors can be classified into a rotary vibration motor and a linear vibration motor according to the movement method of the vibrator, and recently, a linear vibration motor having advantages such as fast reaction speed, low residual vibration and miniaturization is mainly used. Such a linear vibration motor is disclosed in Republic of Korea Patent Publication 10-1055562 (announcement date 08 August 2011).

The linear vibration motor generates vibration while the oscillator reciprocates linearly such as vertically or horizontally. The elastic body collides with the housing by the linear reciprocating motion of the vibrator. Such a collision causes noise during operation of the vibration motor and causes a problem of shortening the life of the vibration motor.

Accordingly, there has been an increasing demand for linear vibration motors that can eliminate or reduce the impact of elastic bodies on the housing.

An object of the present invention is to provide a linear vibration motor that can eliminate or reduce the collision between the elastic body and the housing.

Another problem to be solved by the present invention is to provide a linear vibration motor which reduces noise when vibration occurs and improves durability.

The linear vibration motor of the present invention for solving the above problems, a housing forming an internal space, a stator coupled to the housing, a vibrator vibrated by electromagnetic force generated by interaction with the stator, one end of the housing One side is coupled to the inside, the other end includes an elastic body coupled to the vibrator, the coupling portion of the one end of the elastic body abuts and coupled to one side of the protruding in the inner direction of the housing than the remaining portion other than the coupling portion of the one surface It is formed stepped.

In one embodiment of the present invention, it may further include a damper coupled to the remaining portion of the one surface.

In one embodiment of the present invention, the coupling portion may be a central portion of the one surface.

In one embodiment of the present invention, the coupling portion may be a peripheral portion of the one surface.

In one embodiment of the present invention, the one side is the coupling portion is formed in the central portion, the coupling portion is formed to protrude in the inner direction of the housing than the remaining portion of the one surface, the elastic body corresponds to the one end It may be a leaf spring including an inner plate portion, an outer plate portion corresponding to the other end and a connecting portion connecting the inner plate portion and the outer plate portion.

In one embodiment of the present invention, the inner space is formed surrounded by the remaining portion of the one surface, the height portion of the step and the side extending from the outside of the one surface is formed, the outer plate portion in the tension and compression process of the elastic body At least a portion of may be temporarily accommodated in the internal space.

In one embodiment of the present invention, the one surface is the coupling portion is formed in the periphery, the central portion corresponding to the remaining portion of the coupling portion is formed to protrude in the outward direction of the housing, the elastic body is the It may be a leaf spring further comprising an outer plate portion corresponding to one end, an outer plate portion corresponding to the other end and a connecting portion connecting the inner plate portion and the outer plate portion.

In one embodiment of the invention, the inner space is formed surrounded by the central portion of the one surface and the height portion of the step is formed, at least a portion of the inner plate portion in the tension and compression process of the elastic body is temporarily in the inner space Can be accommodated.

In one embodiment of the present invention, the housing includes a case which is open on one side and a bracket coupled to one side of the case, one surface of the housing may be the other side facing the bracket.

Linear vibration motor according to an embodiment of the present invention has the effect of eliminating or reducing the collision between the elastic body and the housing.

In addition, the linear vibration motor according to an embodiment of the present invention has the effect of reducing noise when vibration is generated and improving durability.

1 is a cross-sectional view of a linear vibration motor according to an embodiment of the present invention.

2 is a plan view of an elastic body according to an embodiment of the present invention.

3 is a plan view of a case according to an embodiment of the present invention.

Figure 4 is a perspective plan view showing a coupling state of the elastic body and the case according to an embodiment of the present invention.

5 to 7 are cross-sectional views illustrating an operating state of the linear vibration motor of FIG. 1.

8 is a cross-sectional view of a linear vibration motor according to another embodiment of the present invention.

9 is a plan view of a case according to another embodiment of the present invention.

Figure 10 is a perspective plan view showing a coupling state of the elastic body and the case according to another embodiment of the present invention.

11 and 12 are cross-sectional views illustrating an operating state of the linear vibration motor of FIG. 8.

13 is a cross-sectional view of a linear vibration motor according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In describing the present invention, if it is determined that adding specific descriptions of techniques or configurations already known in the art may make the gist of the present invention unclear, some of them will be omitted from the detailed description. In addition, terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to related persons or customs in the art. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

Hereinafter, a linear vibration motor according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is a cross-sectional view of a linear vibration motor according to an embodiment of the present invention. 2 is a plan view of an elastic body according to an embodiment of the present invention. 3 is a plan view of a case according to an embodiment of the present invention. Figure 4 is a perspective plan view showing a coupling state of the elastic body and the case according to an embodiment of the present invention. 5 to 7 are cross-sectional views illustrating an operating state of the linear vibration motor of FIG. 1.

Referring to FIG. 1, the linear vibration motor includes a housing 100, a stator, a vibrator, and an elastic body 400.

The housing 100 forms an inner space to accommodate the stator, the vibrator and the elastic body 400. The housing 100 includes a case 110 and a bracket 130. The case 110 is open at one side and defines an internal space. The bracket 130 is coupled to one side of the case 110 to seal the internal space. In this case, the bracket 130 forms the lower surface of the housing 100, the upper surface of the case 110 facing the bracket 130 forms the upper surface of the housing 100, and the side surface of the case 110 is the housing 100. ) Extends from the upper surface to the lower surface of the housing 100.

The stator and the vibrator generate vibration by mutual electromagnetic force. The stator and the vibrator are the magnet 200 and the coil 300. According to the design of the linear vibration motor, the stator may be the magnet 200 and the vibrator may be the coil 300. In contrast, the stator may be the coil 300 and the vibrator may be the magnet 200. The embodiment shown in Figure 1 is of course that the stator is a magnet 200, the vibrator 300 or vice versa.

The stator is coupled to the inside of the housing 100. Referring to FIG. 1, the magnet 200 is coupled to and fixed to a bottom surface of the housing 100. In FIG. 1, the magnet 200 is illustrated as being coupled only to the bottom surface of the housing 100, but the magnet 200 may be coupled to the top surface of the housing 100, or may be coupled to both the top and bottom surfaces thereof. Do.

The vibrator vibrates by the electromagnetic force generated by the interaction with the stator. Referring to FIG. 1, the coil 300 is connected to the housing 100 by an elastic body 400. The coil 300 is combined with the weight 310 having a predetermined mass. When a current flows in the coil 300, an electromagnetic force is generated in relation to the magnet 200. Both ends of the coil 300 are connected to a circuit 320 capable of inputting a current to the coil 300. One end of the circuit 320 is connected to the coil 300, and the other end extends outside the housing 100 to transmit an electrical signal input from the outside to the coil 300. The circuit 320 may be formed of a flexible circuit 320 substrate to change shape as the vibrator vibrates.

Referring to FIG. 2, the elastic body 400 may be formed of a leaf spring having an elastic force. The leaf spring includes an inner plate portion 410, an outer plate portion 430 formed outside the inner plate portion 410, and a connection portion 450 connecting the inner plate portion 410 and the outer plate portion 430. Two or more connection parts 450 exist to connect the inner plate portion 410 and the outer plate portion 430 at two or more positions. In the embodiment shown in Figure 2, the connecting portion 450 connects the inner plate portion 410 and the outer plate portion 430 in three positions spaced apart from each other. The spring constant of the elastic body 400 may be adjusted by the number and shape of the connection parts 450. The resonance frequency of the vibrator may be determined by the spring constant of the elastic body 400.

One end of the elastic body 400 is coupled to the inside of one surface of the housing 100. One end of the elastic body 400 may be an inner plate portion 410 or an outer plate portion 430, one surface of the housing 100 may be an upper surface or a lower surface. According to the embodiment shown in Figure 1, the inner plate portion 410 of the elastic body 400 is coupled to the upper surface of the case (110). Therefore, in the state where no external force is applied, the inner plate portion 410 of the elastic body 400 is located above the outer plate portion 430 in the vertical direction.

1 and 3, a portion of the upper surface of the case 110 to which one end of the elastic body 400 is coupled may be the coupling part 120. The coupling part 120 is a part that couples with one end of the elastic body 400 of one surface of the housing 100. According to the embodiment shown in Figures 1 and 3, the coupling portion 120 corresponds to the center of the upper surface of the case (110). Coupling portion 120 is protruded in the inner direction of the housing 100 than the peripheral portion 121 except for the coupling portion 120 of the upper surface of the case 110 is formed stepped. That is, in other words, the remaining peripheral portion 121 except for the coupling portion 120 protrudes outward from the coupling portion 120 to be formed in a stepped manner. Accordingly, the inner space S surrounded by the upper peripheral portion 121 of the case 110, the height portion of the step, and the side surface of the case 110 is formed.

1 and 4, an inner plate portion 410 corresponding to one end of the elastic body 400 is coupled to an upper surface of the case 110 corresponding to one surface of the housing 100. Specifically, one end of the elastic body 400 is coupled to the coupling portion 120 corresponding to the center of the upper surface of the case 110.

The other end of the elastic body 400 is coupled to the vibrator. Referring to FIG. 1, the outer plate portion 430 corresponding to the other end of the elastic body 400 is coupled to the upper surface of the coil 300 or the weight 310 coupled to the coil 300. As the elastic body 400 is stretched and compressed, the position of the vibrator is changed.

With reference to FIGS. 1, 5, and 6, a state in which the elastic body 400 is stretched and compressed will be described. 1 illustrates a state in which no external force is applied to the elastic body 400. 5 illustrates a state in which the elastic body 400 is tensioned. 6 illustrates a state in which the elastic body 400 is compressed. The vibration motor of the present invention generates vibration while the three states are repeated.

When the elastic body 400 is compressed as shown in FIG. 6, the positional difference in the vertical direction between the inner plate part 410 and the outer plate part 430 decreases. In some cases, the inner plate portion 410 and the outer plate portion 430 may be at the same position in the vertical direction. In addition, in some cases, the outer plate portion 430 is located above the inner plate portion 410, the position may be reversed. In this case, the outer plate part 430 is accommodated in the inner space S of the case 110. When the upper surface of the case 110 is formed flat, a portion of the outer plate portion 430 may collide with or interfere with the upper surface of the case 110, and noise or wear may occur. When the coupling part 120 of the upper surface of the case 110 protrudes in the inner direction of the housing 100 to form a step, and the elastic body 400 is compressed, the outer plate part 430 and the case 110 of the elastic body 400 are compressed. ) It can reduce collision and interference with the upper surface.

Referring to FIG. 7, when the elastic body 400 is compressed, it may be inclined in one direction. This may occur because the attraction or repulsive force between the magnet 200 and the coil 300 is not constant in all directions. In addition, when the vibration motor is positioned so as not to maintain the horizontal direction, the elastic body 400 may be inclined by gravity. In this case, a part of the outer plate portion 430 of the elastic body 400 may be located above the inner plate portion 410 as it is inclined. In this case, a part of the outer plate part 430 is accommodated in the inner space S of the case 110. When the upper surface of the case 110 is formed flat, a portion of the outer plate portion 430 may collide with or interfere with the upper surface of the case 110, and noise or wear may occur. When the coupling part 120 of the upper surface of the case 110 protrudes in the inner direction of the housing 100 to form a step, and the elastic body 400 is compressed, the outer plate part 430 and the case 110 of the elastic body 400 are compressed. ) It can reduce collision and interference with the upper surface.

Hereinafter, a linear vibration motor according to another embodiment of the present invention will be described with reference to FIGS. 8 to 12. In the embodiments to be described later, the same contents as those described with reference to FIGS. 1 to 7 will be omitted, and descriptions will be given based on different points.

8 is a cross-sectional view of a linear vibration motor according to another embodiment of the present invention. 9 is a plan view of a case according to another embodiment of the present invention. Figure 10 is a perspective plan view showing a coupling state of the elastic body and the case according to another embodiment of the present invention. 11 and 12 are cross-sectional views illustrating an operating state of the linear vibration motor of FIG. 8.

Referring to FIG. 8, one end of the elastic body 400 is coupled to one inner side of the housing 100. One end of the elastic body 400 may be an inner plate portion 410 or an outer plate portion 430, one surface of the housing 100 may be an upper surface or a lower surface. According to the embodiment shown in Figure 8, the outer plate portion 430 of the elastic body 400 is coupled to the upper surface of the case (110). Therefore, the outer plate portion 430 of the elastic body 400 is located in the vertical direction than the inner plate portion 410 in the state that no external force is applied.

8 and 9, a portion of the upper surface of the case 110 to which one end of the elastic body 400 is coupled may be the coupling part 120. The coupling part 120 is a part that couples with one end of the elastic body 400 of one surface of the housing 100. According to the embodiment illustrated in FIGS. 8 and 9, the coupling part 120 corresponds to a peripheral part of the upper surface of the case 110. Coupling portion 120 is protruded in the inner direction of the housing 100 than the central portion other than the coupling portion 120 of the upper surface of the case 110 is formed stepped. That is, in other words, the remaining central portion except for the coupling portion 120 protrudes outward from the coupling portion 120 to be formed stepped. As a result, an inner space S surrounded by the center of the upper surface of the case 110 and the height portion of the step is formed.

8 and 10, the outer plate portion 430 corresponding to one end of the elastic body 400 is coupled to the upper surface of the case 110 corresponding to one surface of the housing 100. Specifically, one end of the elastic body 400 is coupled to the coupling portion 120 corresponding to the peripheral portion of the upper surface of the case 110.

The other end of the elastic body 400 is coupled to the vibrator. Referring to FIG. 8, the inner plate part 410 corresponding to the other end of the elastic body 400 is coupled to the coil 300 or the upper surface of the weight 310 coupled to the coil 300. As the elastic body 400 is stretched and compressed, the position of the vibrator is changed.

Referring to Figures 8, 11 and 12 will be described in the state of use as the elastic body 400 is tensioned and compressed. 8 illustrates a state in which no external force is applied to the elastic body 400. 11 illustrates a state in which the elastic body 400 is tensioned. 12 illustrates a state in which the elastic body 400 is compressed. The vibration motor of the present invention generates vibration while the three states are repeated.

As shown in FIG. 12, when the elastic body 400 is compressed, the positional difference in the vertical direction between the inner plate part 410 and the outer plate part 430 decreases. In some cases, the inner plate portion 410 and the outer plate portion 430 may be at the same position in the vertical direction. In addition, in some cases, the inner plate portion 410 is located above the outer plate portion 430, the position may be reversed. In this case, the inner plate part 410 is accommodated in the internal space S of the case 110. When the upper surface of the case 110 is formed flat, a portion of the inner plate part 410 may collide with or interfere with the upper surface of the case 110, causing noise or wear. When the coupling part 120 of the upper surface of the case 110 protrudes in the inner direction of the housing 100 to form a step, and the elastic body 400 is compressed, the inner plate portion of the elastic body 400 and the upper surface of the case 110 and Collision and interference can be reduced.

In addition, as described above, the elastic body 400 may be inclined when compressed. Even in this case, the inner plate part 410 is accommodated in the internal space S of the case 110. When the upper surface of the case 110 is formed flat, a portion of the inner plate part 410 may collide with or interfere with the upper surface of the case 110, causing noise or wear. When the coupling part 120 of the upper surface of the case 110 protrudes in the inner direction of the housing 100 to form a step, and the elastic body 400 is compressed, the inner plate portion of the elastic body 400 and the upper surface of the case 110 and Collision and interference can be reduced.

Hereinafter, with reference to the accompanying FIG. 13, a linear vibration motor according to another embodiment of the present invention will be described. The same descriptions as those described with reference to FIGS. 1 to 7 will be omitted in the following embodiments, and the description will be mainly focused on different points.

Referring to FIG. 13, in the upper surface of the case 110 corresponding to one surface of the housing 100, a damper may be provided inside the remaining portion except for the coupling part 120. In the embodiment illustrated in FIG. 13, the coupling part 120 is a central portion of the upper surface of the case 110, and a damper 500 is formed inside the periphery of the upper surface of the case 110. Such is not limited to this. When the elastic body 400 is compressed, the elastic body 400 may collide with the upper surface of the case 110. In this case, the damper 500 may be present between the case 110 and the elastic member 400 to buffer the case. This can reduce noise or wear.

In the above, embodiments of the linear vibration motor of the present invention have been described. The present invention is not limited to the above-described embodiment and the accompanying drawings, and various modifications and variations will be possible in view of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be defined not only by the claims of the present specification but also by the equivalents of the claims.

Claims

A housing defining an inner space;

A stator coupled to the housing;

A vibrator vibrating by an electromagnetic force generated by interaction with the stator;

One end is coupled to the inside of one surface of the housing, the other end includes an elastic body coupled to the vibrator,

One end of the elastic body is coupled to one end of the coupling portion coupled to the linear vibration motor protruding in the inner direction of the housing than the remaining portion other than the coupling portion of the one surface.
According to claim 1,

Linear vibration motor further comprises a damper coupled to the remaining portion of the one surface.
According to claim 1,

The coupling part is a linear vibration motor of the central portion of the one surface.
According to claim 1,

The coupling part is a linear vibration motor of the periphery of the one surface.
According to claim 1,

The one surface is formed in the center of the coupling portion, the coupling portion is formed to protrude in the inner direction of the housing than the remaining portion of the one surface,

The elastic body is a linear vibration motor including an inner plate portion corresponding to the one end, an outer plate portion corresponding to the other end and a connecting portion connecting the inner plate portion and the outer plate portion.
The method of claim 5,

An inner space formed by being surrounded by the remaining portion of the one surface, the height portion of the step, and a side surface extending from the outer side of the one surface,

At least a portion of the outer plate portion during the tension and compression of the elastic body is a linear vibration motor temporarily accommodated in the inner space.
According to claim 1,

The one surface is the coupling portion is formed in the periphery, the coupling portion is a central portion corresponding to the remaining portion of the one surface is formed stepped to protrude in the outward direction of the housing,

The elastic body is a linear vibration motor further comprising a plate spring, the outer plate portion corresponding to the one end, the outer plate portion corresponding to the other end and a connecting portion connecting the inner plate portion and the outer plate portion.
The method of claim 7, wherein

An inner space is formed surrounded by a central portion of the one surface and a height portion of the step,

At least a portion of the inner plate portion during the tension and compression of the elastic body is a linear vibration motor temporarily accommodated in the inner space.
According to claim 1,

The housing includes a case which is open on one side and a bracket coupled to one side of the case,

One surface of the housing is a linear vibration motor on the other side facing the bracket.