KR102066662B1 - Vibration motor - Google Patents

Abstract

The present invention relates to a vibration motor, wherein the vibration motor is disposed in contact with a side of the housing in the housing having an inner space, a coil having a hollow portion therein, and spaced to correspond to the coil in the hollow portion. It includes a magnet.

Description

Vibration Motors {VIBRATION MOTOR}

The present invention relates to a vibration motor.

Recently, the vibrating motor generally used as a silent receiver of a mobile terminal has a shorter stroke length and a faster vibration characteristic at start and stop than the conventional eccentric rotation type vibration generator due to the elastic force of the elastic member. Have

Such a vibrating motor includes a stator and a vibrator, and is a component that generates vibration by electromagnetic force between the stator and the vibrator.

Vibration motors can be classified into a rotary vibration motor and a linear vibration motor according to the direction of movement of the vibrator. 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 vibration force of the linear vibration motor is determined by the weight and speed of the vibrator. Recently, as the electronic devices such as portable terminals on which the vibration motor is mounted become smaller, the vibration motor is also miniaturized. Therefore, as the vibrator is also miniaturized, securing a sufficient vibration force has emerged as a problem.

The problem to be solved by the present invention is to improve the user's satisfaction by improving the vibration force of the vibration motor.

Vibration motor according to an aspect of the present invention for solving the above problems is a housing having an inner space, a coil located in the inner space in contact with the side of the housing or located below the housing and having a hollow inside, and the The magnet includes a magnet spaced apart from the coil to correspond to the coil.

The vibration motor according to the above feature may further include a weight body positioned in contact with the magnet in the hollow part.

The vibration motor according to the above feature may further include a yoke positioned in at least one of the upper and lower portions of the coil.

The vibration motor according to the above feature may further include a yoke positioned on at least one of the upper and lower portions of the magnet.

The weight body may further include a mounting groove positioned at an outer edge portion of one of its upper and lower surfaces, and the yoke may be located in the mounting groove of the weight body.

The vibration motor according to the above feature may further include an elastic body connecting the yoke positioned on the upper surface of the magnet and the upper portion of the housing.

The vibration motor according to the above feature may further include an yoke disposed on the lower surface of the magnet and an elastic body connecting the lower portion of the housing.

The installation height of the coil may be different from the installation height of the magnet.

The installation height of the coil may be lower than the installation height of the magnet.

The vibration motor according to the above feature may further include an elastic body connecting the magnet and the housing.

The elastic body may connect between the bottom of the housing and the bottom surface of the magnet or may connect between the top of the housing and the bottom surface of the magnet.

The coil may be spaced apart from the side of the housing.

According to this feature, since the coil is located along the inner surface of the housing and the magnet and the weight body are located in the hollow formed inside the coil, the space in which the magnet and the weight body can be located is increased to the maximum, thereby increasing the size of the weight body. It can be increased as much as possible, thereby increasing the weight of the weight to improve the vibration efficiency of the vibration motor.

In addition, since the yoke is attached to the coil or the magnet, the magnetization circuit is formed more efficiently, and the magnetization circuit is more concentrated toward the coil.

Moreover, when the yoke is located on a part of the weight body that is in contact with the magnet, the mounting groove is located at the outer edge portion of the weight body for yoke mounting, so that the yoke is easier to mount.

1 is a cross-sectional view of a vibration motor according to an embodiment of the present invention.
FIG. 2 is a perspective view of an example of an elastic body of the vibration motor shown in FIG. 1.
3 to 9 are cross-sectional views showing another example of the vibration motor according to the embodiment of the present invention.
10 is a cross-sectional view of a 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.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” specifies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Hereinafter, a vibration motor according to an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, the vibration motor 10 includes a housing 100, a stator 200, a vibrator 300, and an elastic body 400.

The housing 100 includes a vibration motor 10 therein to protect the vibration motor 10 from the outside.

Therefore, the housing 100 has a space in which the vibration motor 10 is located, and the stator 200, the vibrator 300, and the elastic body 400 are positioned in the interior space of the housing 100.

The housing 100 may be formed as a cylindrical pillar or a polygonal pillar, and the shape of the inner space is determined according to the shape of the housing 100.

The housing 100 includes a bracket 110 and a case 120 connected to the bracket 110.

The bracket 110 forms a lower portion of the housing 100 and has a planar shape of a circular shape or a multi-layered shape.

The case 120 is positioned on the bracket 110 and serves as a cover of the vibration motor 10.

The case 120 constitutes a side and an upper portion of the housing 100, and the lower portion is formed in an open form, and an inner space, which is an empty space therein, is opened through the lower portion.

Therefore, the stator 200, the vibrator 300, and the elastic body 400 are positioned in the inner space surrounded by the bracket 110 and the case 120.

 The bracket 110 and the case 120 may be made of a magnetic material or a nonmagnetic material.

The stator 200 and the vibrator 300 positioned in the inner space of the housing 100 generate electromagnetic force by interaction. Therefore, the vibrator 300 generates a vibration by performing a linear reciprocating motion by the electromagnetic force generated by the interaction with the stator 200.

As the stator 200 and the vibrator 300 are relative to each other, the stator 200 refers to a part fixed to the vibrator 300 and the vibrator 300 refers to a part vibrating with respect to the stator 200.

In this example, the stator 200 includes a circuit board 210 and a coil 220 positioned adjacent to the side of the housing 100.

In addition, the vibrator 300 includes a magnet 310 and a weight body 320 connected to the magnet 310.

However, unlike the present example, according to the design of the vibration motor, the stator 200 may include a magnet and the vibrator 300 may include a coil.

The circuit board 210 of the stator 200 may be formed of a printed circuit board (PCB) mounted with a driving circuit for controlling the operation of the vibration motor 10, for example, a flexible printed circuit. It may be made of a flexible printed circuit board (FPCB).

The coil 220 is a coil wound a plurality of times in a corresponding direction along the side of the housing 100, that is, the inner side of the case 120, and is a coreless coil in which no core exists. .

At this time, the outer surface portion of the coil 220 adjacent to the inner side of the case 120 is bonded to the inner side of the case 120, the position of the coil 220 is fixed.

Therefore, an empty space in the form of a cylinder or a square pillar is formed in the center portion of the coil 220, and the magnet 310 and the weight body 320 of the stator 200 are positioned in the empty space of the coil 220. do.

Both ends of the coil 220 are electrically and physically connected to corresponding terminals of the circuit board 210, and thus an electrical signal, for example, an alternating current, is applied from the circuit board 210 to the coil 220 through the corresponding terminal. The electromagnetic force (ie, vibration force) is generated by the interaction with the magnet 310.

In this case, the direction of the alternating current applied to the coil 220 may be determined according to the magnetization shape of the magnet 310 and the arrangement relationship between the coil 220 and the magnet 310.

The vibrator 300 has a magnet 310 and a weight 320 as already described, and these magnets 310 and the weight 320 are surrounded by the windings of the coil 220. Located in the interior space.

At this time, since the magnet 310 is mounted in contact with the inner side of the weight body 320, the magnet 310 and the weight body 320 are coupled to each other.

The magnet 310 is disposed to be spaced apart from the inner surface of the coil 220 in the inner space of the coil 220.

At this time, the shape of the magnet 310 may be determined according to the shape of the inner surface of the coil 220, and a cylindrical or square column shape in which a hollow portion, which is a hole having a circular or rectangular planar shape, is formed in the center portion thereof. Have

This magnet 310 generates electrical power by interaction with the corresponding coil 220, as already described. The weight body 320 is an object having a weight having a predetermined size. Since the resonance frequency of the vibrator 300 may be determined by the mass of the weight body 320, the weight of the weight body 320 is adjusted to adjust the weight of the vibrator 300. Can have the maximum amount of vibration.

The weight body 320 may be made of a material having a relatively high specific gravity, and may be made of a nonmagnetic material.

For example, the weight body 320 may be made of a material having a specific gravity greater than iron, such as tungsten.

Since the weight body 320 of the present example is positioned to be coupled with the magnet 310 in the hollow portion formed in the center portion of the magnet 310 as described above, the shape of the weight body 320 is the shape of the hollow portion of the magnet 310. It is decided according to.

As such, since the weight body 320 is coupled to the magnet 310, the weight body 320 also vibrates when the magnet 310 is vibrated by the electromagnetic force.

As shown in the present example, the coil 220 is positioned along the inner surface of the case 120, and the magnet 310 and the weight body 320 are located in the inner space of the coil 220. The space in which sieve 320 can be located is increased to the maximum.

Thus, the size of the weight body 320 can be increased to the maximum, and the vibration efficiency of the vibration motor 10 is improved due to the weight of the weight body 320 being increased.

The elastic body 400 is for connecting the vibrator 300 to the housing 100, and may be formed of a leaf spring such as a circle or a square having elastic force.

As shown in FIG. 2, the elastic body 400 includes an inner plate portion (eg, one end) 410, an outer plate portion (eg, the other end) 420 formed outside the inner plate portion 410, and an inner plate portion. And a connection part 430 connecting the 410 and the outer plate part 420.

At this time, the number of the connecting portion 430 is a plurality, the connecting portion 430 connects the inner plate portion 410 and the outer plate portion 420 at two or more points.

Referring to FIG. 1, the elastic body 400 connects between the magnet 310 and the lower portion of the housing 100, for example, the bracket 110.

To this end, the outer plate portion 420 of the elastic body 400 is coupled to the lower surface of the magnet 310, the inner plate portion 410 is coupled to the upper surface of the bracket (110). At this time, the elastic body 400 and the corresponding parts 110 and 310 are bonded using welding, but otherwise, may be bonded through other various methods.

Due to the elastic body 400, the vibrator 300 is coupled to the lower portion of the housing 100 to perform a vibration operation in the vertical direction.

Next, another example of an embodiment of the present invention will be described with reference to FIGS. 3 to 9.

In the vibration motors shown in FIGS. 3 to 9, the same components as those of FIG. 1 are denoted by the same reference numerals as those of FIG. 1, and detailed description thereof will also be omitted.

First, referring to FIG. 3, the vibration motor 10a will be described.

Compared with FIG. 1, the vibration motor 10a illustrated in FIG. 3 has the same structure as the vibration motor 10 illustrated in FIG. 1 except for the fixed height of the coil 220 and the arrangement position of the elastic body 400. Have

That is, in the vibration motor 10 shown in FIG. 1, the installation heights of the coil 220 and the magnet 310 adjacent to the coil 220 are substantially similar, so that the highest height of the coil 220 and the magnet 310 are separated. The highest height is substantially the same, and the lowest height of the coil 220 and the magnet 310 are also substantially the same.

However, in the vibration motor 10a illustrated in FIG. 3, the height of the coil 220 is different from the height of the magnet 310, and the height of the coil 220 is located below the height of the magnet 310.

As a result, the highest height of the coil 220 is lower than the highest height of the adjacent magnet 310, and the lowest height of the coil 220 is also lower than the lowest height of the adjacent magnet 310.

In FIG. 3, the arrangement position of the elastic body 400 is located on the upper portion of the housing 100, and the elastic body 400 is adhered to the upper portion of the housing 100 in a vertically inverted form as compared with FIG. 2.

Accordingly, as shown in FIG. 3, the inner plate portion 410 of the elastic body 400 is in contact with the upper inner surface of the case 120, which is the upper portion of the housing 100, and the outer plate portion (on the upper surface of the magnet 310). 420 abuts.

The arrangement relationship of the elastic body 400 may also be applied to the vibration motor 10 of FIG. 1.

Compared with FIG. 1, the vibration motors 10b-10g shown in FIGS. 4 to 9 further include a yoke attached to one of the coil 220 and the magnet 310. In this case, the yoke is made of a magnetic material such as iron.

Therefore, unlike the vibration motor 10 of FIG. 1, the vibration motors 10b-10g shown in FIGS. 4 to 9 further include a yoke in addition to the stator and the vibrator.

For example, the vibrating motor 10b of FIG. 4 has a first yoke 231 and 232 positioned on the upper and lower surfaces of the coil 220 and disposed along the upper and lower surfaces, as compared with FIG. 1. ).

In addition, when compared to FIG. 4, the vibration motor 10c of FIG. 5 is located on one of the upper and lower surfaces of the coil 220 (for example, the lower surface) to locate the corresponding surface (for example, the lower surface) on which it is located. One yoke 232 is provided.

These at least one yoke 231, 232 together with the adjacent magnet 310 form a magnetic circuit and allow the magnetic circuit to concentrate towards the coil 220.

Therefore, the generating force of the electromagnetic force between the coil 220 and the magnet 310 is increased by the at least one yoke 231, 232.

In the vibration motors 10d-10g illustrated in FIGS. 6 to 9, yokes 331 and 332 are disposed along at least one of the upper and lower surfaces of the magnet 310.

More specifically, in the vibration motor 10d of FIG. 6, the first and second yokes 331 and 332 are positioned on the upper and lower surfaces of the magnet 310, respectively, and are disposed along the upper and lower surfaces. In the vibrating motor 10e of FIG. 7, one yoke 332 is positioned on one of the upper and lower surfaces of the magnet 310, for example, the lower surface, and is disposed along the corresponding surface (eg, the lower surface). It is.

In order to mount the at least one yoke 331, 332, the magnet 310 to which the yoke 331, 332 is mounted has a thickness reduced by the thickness of the yoke 331, 332 mounted on the corresponding surface.

Due to the reduced thickness of the magnet 310, the yoke 331, 332 located on at least one of the upper and lower portions of the magnet 310 may also be disposed to face the adjacent coil 220 together with the magnet 310 to have a magnetic circuit. Make the shape of the smooth.

In addition, in the vibration motors 10f and 10g illustrated in FIGS. 8 and 9, the yokes 331 and 332 are positioned on at least one of the upper and lower surfaces of the magnet 310 as shown in FIGS. 6 and 7. In addition, as the yokes 331 and 332 are positioned, the thickness of the magnet 310 also has a thickness reduced by the thickness of the yokes 331 and 332 mounted on at least one of the upper and lower surfaces.

However, in the vibration motors 10f and 10g illustrated in FIGS. 8 and 9, a part of the yokes 331 and 332 mounted on the corresponding surface of the magnet 310 is also located in the adjacent weight body 320.

To this end, at least one of the upper and lower surfaces of the weight body 320 is formed with a mounting groove for mounting the corresponding yoke (331, 332) extending from the magnet 310 side, the yoke in the mounting groove A portion of 331 and 332 is located.

At this time, the mounting groove is formed in the outer edge portion of the upper surface and the lower surface of the weight body 320, that is, the corner portion of the portion in contact with the magnet 310.

As such, as the yokes 331 and 332 are positioned on the corresponding surface of the magnet 310, the formation of the magnetic circuit toward the coil 220 is concentrated, so that the generation efficiency of the electromagnetic force is good.

Furthermore, since the yokes 331 and 332 are mounted in the mounting grooves formed in the weight body 320, the yoke is easy to mount.

As such, when the yokes 331 and 332 are positioned on at least one of the upper and lower surfaces of the magnet 310, the elastic body 400 connecting the housing and the vibrator 300 may be formed in the upper surface of the magnet 310, The yoke 331, 332 on the lower or upper surface of the magnet 310 instead of the lower surface and the upper portion of the housing 100 (eg, the upper inner surface of the case 120) or the lower portion of the housing 100. For example, the upper surface of the bracket 110 is connected and coupled respectively.

Next, the vibration motor 10h according to another embodiment of the present invention will be described with reference to FIG. 10.

Compared to FIG. 1, components having the same structure and performing the same function are denoted by the same reference numerals as those of FIG. 1, and detailed description thereof will be omitted.

As shown in FIG. 10, the vibration motor 10h of this example has the same structure as the vibration motor 10 shown in FIG. 1 except for the mounting position of the coil 220.

That is, in this example, the coil 220 is mounted on the bracket 110 at the bottom of the housing 100 instead of being located on the inner side of the case 120.

For this reason, the vibration motor 10h of the present example has a stator including a housing 100 having a bracket 110 and a case 120, a circuit board 210, and a coil 220 positioned on the bracket 110. 200, a vibrator 300 having a magnet 310 and a weight body 320, and an elastic body 400.

The coil 220 of the present example is wound in a predetermined direction along an inner side surface of the case 120 at the edge portion of the bracket 110 where the circuit board 210 is not located. As a result, a hollow part is formed inside the coil 220 as in the case of FIG. 1, and the vibrator 300 is positioned in the hollow part.

At this time, the coils 220 are spaced apart without contacting the inner side surface of the case 120.

As such, as the coil 220 is positioned on the bracket 110 at the bottom of the housing 100 to be spaced apart from the side of the case 120, which is a side of the housing 100, the degree of freedom for designing the case 120 increases. do.

In addition, a heavy weight coil 220 is positioned on the bracket 110 forming the bottom surface of the housing 100. As a result, the position of the coil 220 is more stable than when positioned on the inner side of the case 120 to be spaced apart from the bracket 110, and is exposed to the air by vibration generated by the operation of the vibration motor 10h. The risk of damage or damage to the attachment state of the floating coil 220 is greatly reduced.

In the case of the vibration motor 10h, it is obvious that all of the examples shown in FIGS. 3 to 9 can be applied.

In the above, embodiments of the 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.

10, 10a-10h: vibration motor 100: housing
110: bracket 120: case
200: stator 210: circuit board
220: coils 231, 232, 331, 332: yoke
300: oscillator 310: magnet
320: weight body 400: elastic body

Claims (13)

A housing having an inner space;
A coil positioned in the inner space in contact with a side of the housing and having a hollow part therein;
Magnets spaced apart from each other in the hollow portion to correspond to the coil;
A weight body positioned in contact with the magnet in the hollow part;
First yokes respectively positioned on the upper and lower portions of the coil and spaced apart from the upper and lower surfaces of the housing; And
Second yokes located above and below the magnet
Including,
The weight body includes a mounting groove located on each outer edge portion of its upper and lower surfaces,
The second yoke is located in the mounting groove of the weight body,
The top height of the second yoke located above the magnet is the same as the top height of the weight, and the bottom height of the second yoke located below the magnet is the same as the bottom height of the weight.
Vibration motor. delete delete delete delete In claim 1,
And an elastic body connecting the second yoke on the upper surface of the magnet and the upper portion of the housing. In claim 1,
And a resilient body connecting the second yoke on the bottom surface of the magnet and the bottom of the housing. delete delete In claim 1,
Vibration motor further comprises an elastic body connecting the magnet and the housing. In claim 10,
The elastic body is a vibration motor for connecting between the lower surface of the housing and the lower surface of the magnet. In claim 10,
The elastic body is a vibration motor for connecting between the upper surface of the housing and the lower surface of the magnet. In claim 1,
The coil is spaced apart from the side of the housing.

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