KR101951715B1 - Linear type vibration motor vibrated Verticality - Google Patents

Abstract

The present invention relates to a linear vertical vibration motor with a riveting coupling structure, which prevents eccentric vibration to realize stable vibrational force. According to the present invention, to be coupled to a bracket (10), a protrusion part (P) is extended and deformed to the periphery of a rivet coupling cut part (11) of the bracket (10) by a rotating and pressing riveting punch such that a riveting coupling part (R) is formed. Accordingly, the bracket (10) is coupled to a yoke shaft (40).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a linear type vibration motor having a riveting connection structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vertical vibration motor, and more particularly, to a linear type vertical vibration motor having a riveting engagement structure for preventing stray vibration and realizing a stable vibration force.

2. Description of the Related Art Recently, with the rapid development of wireless communication technology, portable communication devices are getting smaller and lighter, and components including device devices, IC chips, and circuits mounted inside portable communication devices have become highly integrated and high- It has become necessary to evolve the size and shape in order to increase the space utilization.

In addition, a flat vibration motor mounted inside a portable communication device and informing of an incoming call by silent vibration has been studied in accordance with the above-mentioned trends.

The initial models of the vibration motor mounted inside the portable communication device were in the form of a rotary type vibration motor having a stator and a rotor as a basic constitution. The rotary type vibration motor fixes the shaft to the bracket of the stator, rotates the rotor on the shaft In order to improve the vibration power, the volume of the rotor is increased or the number of revolutions is increased to improve the vibration power. However, due to the structural problem, not only miniaturization but also difficulty in generating high vibration And the lifetime can not be guaranteed over a certain period of time.

In order to solve the problem of the above-described rotary type vibration motor, a vertical vibration type actuator vibration motor has been proposed recently.

The upper and lower vibratory actuator-type vibration motors include an upper case and a lower case which are opposed to each other, magnetic force generating means formed on at least one surface of the upper case and the lower case, magnets opposed to the magnetic force generating means, An elastic means for elastically supporting a heavy object placed on at least one of the upper surface and the lower surface of the heavy object so as to increase the vibrational force while vertically moving the upper body and the lower body, And a fixing member for fixing the upper case to the upper case and the lower case.

Such up-and-down vibratory actuator type vibration motors are widely used in recent years because they can extend service life, overcome the limitation of size, and obtain a quick response speed.

However, since the conventional vertical vibration motor is not rigidly coupled with each other, particularly, since the coupling between the bracket and the yoke, which are the shafts for forming the magnetic circuit, is formed by the press-fitting coupling method, , The coupling between the bracket and the yoke is broken, and the knife vibration is generated, so that there is a problem that the life of the vibration motor is shortened.

On the other hand, the vertical vibration type vibration motor can improve the service life of the vibration motor by suppressing the occurrence of the knitting vibration through a rigid coupling structure, and it is possible to manufacture a better vibration motor as the vibration force of the vibration body is improved , There is a continuing need for development of a vibration motor having more rigid coupling and improved vibration power.

Korean Patent Publication No. 10-2010-0073301 (2010. 07. 01.)

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems,

It is an object of the present invention to provide a linear type vertical vibration motor having a riveting engagement structure capable of suppressing the occurrence of knitting vibration through a rigid coupling structure.

According to an aspect of the present invention,

In the linear type vertical vibration motor,

A bracket 10 for supporting and fixing the F-PCB 20 and the yoke shaft 40 and forming a magnetic field closed loop;

An F-PCB 20 seated on the upper plane of the bracket 10 and supplying an external power source to the coil 30;

And is mounted on the upper surface of the F-PCB 20 so as to surround the outer circumferential surface of the yoke shaft 40. Electric power is supplied from the F-PCB 20 to generate an electromagnetic field, A coil (30) which acts on the vibrating body to amplify the vibration of the vibrating body;

And a yoke shaft 40 which penetrates through the center of the bracket 10 and is fixedly coupled to concentrate the flow of the internal electromagnetic field of the coil 30.

Therefore, the present invention has an effect of providing a linear type vertical vibration motor having a riveting engagement structure capable of suppressing the occurrence of knitting vibration through a rigid coupling structure.

1 is an exploded perspective view showing a configuration of a linear type vertical vibration motor having a riveting coupling structure according to the present invention.
Fig. 2 is an assembled cross-sectional view of a linear type vertical vibration motor having a riveting coupling structure according to the present invention.
3 is a view showing an example in which a bracket and a yoke shaft of a linear type vertical vibration motor having a riveting coupling structure according to the present invention are coupled by a riveting punch.
4 is an enlarged partial enlarged view of FIG. 3 A. FIG.
5 is an enlarged partial enlarged view of FIG. 3B.
FIG. 6 is a view showing a whole of a bracket and a yoke shaft in FIG.
7 is a view showing the structure of a yoke shaft and a bracket coupled by a riveting combination of a linear type vertical vibration motor having a riveting coupling structure according to the present invention.
8 is a view showing a configuration of a conventional bracket coupled with a press-fit coupling type and a yoke shaft.
Fig. 9 is a drawing showing the result of the tensile force test according to the joining method shown in Fig. 7 and Fig. 8 (tester name: load tester (SHM-D-100)).
10 is a view showing a state where a bracket of a linear type vertical vibration motor and a yoke shaft are coupled to each other according to an embodiment of the present invention.
11 is a view showing a configuration of a yoke shaft of a linear type vertical vibration motor according to an embodiment of the present invention.
12 is a view showing a combined state of a bracket and a yoke shaft of a linear type vertical vibration motor according to this embodiment of the present invention.
13 is a view showing a configuration of a yoke shaft of a linear type vertical vibration motor according to this embodiment of the present invention.
14 to 15 are views showing the configuration of a weight according to an embodiment of the present invention.
16 is an assembled cross-sectional view of a linear type vertical vibration motor to which the weights of Figs. 14 to 15 of the present invention are applied.
17 is a view showing the flow of air at the time of up-and-down vibration by the linear type vertical vibration motor of the present invention according to the configuration of Fig.
Fig. 18 is a view showing a configuration of a conventional weight. Fig.
Fig. 19 is a diagram showing the result of pressure analysis of the linear type vertical vibration motor of the present invention according to the configuration of Fig. 16. Fig.
Fig. 20 is a diagram showing the pressure analysis results of the vertical vibration motor to which the conventional weight of Fig. 18 is applied. Fig.
FIG. 21 is a diagram showing the load analysis results of FIGS. 19 to 20. FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described by way of example only and with reference to the accompanying drawings, in which: FIG. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. .

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present invention, the term " comprises " or " having ", etc. is intended to specify that there is a feature, number, step, operation, element, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

First, the present invention relates to a linear type vertical vibration motor,

A bracket 10 for supporting and fixing the F-PCB 20 and the yoke shaft 40 and forming a magnetic field closed loop,

An F-PCB 20 which is seated on an upper plane of the bracket 10 and supplies external power to the coil 30,

And is mounted on the upper surface of the F-PCB 20 so as to surround the outer circumferential surface of the yoke shaft 40. Electric power is supplied from the F-PCB 20 to generate an electromagnetic field, A coil 30 that works to amplify the up-and-down vibration of the vibrating body,

And a yoke shaft 40 which penetrates through the center of the bracket 10 and is fixedly coupled to concentrate the flow of the internal electromagnetic field of the coil 30.

When the yoke shaft 40 is engaged with the bracket 10, the protruding portion P is pressed by a revolving punch rotating and pressing, and is pressed and deformed around the bottom surface of the bracket 10 Thereby forming a riveting joint R and engaged.

The bracket 10 is formed so that the protruding portion P of the yoke shaft 40 passing through the center is pressed against the periphery when the protruding portion P is pressed by the revetting punch, And a cutout portion (11) for cutting a rivet portion formed by cutting a part of the bottom surface of the bracket (10) in the horizontal direction.

The yoke shaft 40 further includes a stepped portion 44 formed at a lower portion of the yoke shaft 40 so as to more firmly engage with the bracket 10.

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

1 and 2, according to an embodiment of the present invention,

A bracket 10 for supporting and fixing the F-PCB 20 and the yoke shaft 40 and forming a magnetic field closed loop,

An F-PCB 20 which is seated on an upper plane of the bracket 10 and supplies external power to the coil 30,

And is mounted on the upper surface of the F-PCB 20 so as to surround the outer circumferential surface of the yoke shaft 40. Electric power is supplied from the F-PCB 20 to generate an electromagnetic field, A coil 30 that works to amplify the up-and-down vibration of the vibrating body,

And a yoke shaft 40 which penetrates through the center of the bracket 10 and is fixedly coupled to concentrate the flow of the internal electromagnetic field of the coil 30.

At this time,

A ring yoke 50 coupled to an upper portion of the yoke shaft 40 to concentrate an electromagnetic field of the coil 30 and protect the coil 30 from an external impact,

A spring 60 seated on the upper plane of the bracket 10 and coupled to the vibrator to amplify vibration of the vibrator and determine a resonance frequency,

A weight 70 coupled to an upper portion of the spring 60 and amplifying vibration by its own weight supported by the spring 60 to determine a resonance frequency and fixing the magnet 80,

A magnet 80 which is coupled to the upper portion of the spring 60 and the inner periphery of the weight 70 to generate a magnetic field as a permanent magnet and to act in a magnetic field of the coil 30, and,

Further comprising at least one of a vibrator, a case 90 for protecting a part of the vibration motor of the present invention from an external impact, and a case 90 forming a magnetic field closed loop by forming an outer frame by engaging with the bracket 10 Lt; / RTI >

At this time, the spring 60, the weight 70, and the magnet 80 form a vibrating body.

Referring to FIG. 2, the bracket 10 and the yoke shaft 40 of the present invention may be combined to form a riveting joint R. Referring to FIG.

3 is a view showing a riveting-type engaging process of forming a riveting engaging portion R by a re-punching punch, wherein the riveting engaging portion R is formed as shown in Fig. 3 As shown in the drawing, the revolving punch is formed by a revolving punch. The revolving punch rotates by itself and presses the machined portion.

Referring to Figure 4,

The rivet fitting part R according to an embodiment of the present invention is configured such that the projecting part P of the yoke shaft 40 protrudes through the center of the bracket 10, The bracket 10 and the yoke shaft 40 are coupled to the jig J so as to fix the yoke shaft 40 so that the yoke shaft 40 does not move 5 to 6, when the projection P is rotated by the rivetting punch, the protrusion P is pressed against the rotary pressure of the riveting punch The riveting engaging portion R is formed in such a shape as to fill the space of the rivet engaging portion 11 formed by cutting a part of the bottom surface of the bracket 10 in the horizontal direction .

Therefore, even when the bracket 10 and the yoke shaft 40 are subjected to pressing by the rotation pressing of the riveting punch, the impact is dispersed to maintain the shape without deformation of the bracket, The bracket 10 and the yoke shaft 40 can be firmly coupled to each other.

Thus, referring to Figures 7 to 9,

FIG. 7 is a view showing a structure of a yoke shaft and a bracket coupled by a riveting combination of a linear type vertical vibration motor having a riveting coupling structure according to the present invention. FIG. 8 is a cross- FIG. 9 is a view showing a result of a tensile force test according to the joining type shown in FIG. 7 and FIG. 8. FIG. 9 is a view showing a result of a pull- The yoke shaft 40 has a more rigid tensile strength even when subjected to an external impact and has a tensile strength about 2.4 times higher than that of the yoke shaft and the bracket combined with the conventional press- .

At this time, referring to FIGS. 10 to 11,

The bracket 10 is formed so that the protruding portion P of the yoke shaft 40 passing through the center is pressed against the periphery when the protruding portion P is pressed by the revetting punch, And a cutout portion (11) for cutting a rivet portion formed by cutting a part of the bottom surface of the bracket (10) in the horizontal direction.

10,

At this time, the yoke shaft 40 may further include a protruding portion P protruding downwardly and being pressurized by the riveting punch.

11,

At the lower center of the protrusion P, a center groove 43 for guiding the pressing position of the riveting punch is further included in the riveting operation under the pressure by the riveting punch .

The stepped portion 44 may be formed at a lower portion of the yoke shaft 40 so as to more firmly engage with the bracket 10, .

The yoke shaft 40 may further include a protrusion 41 protruding upward and a step portion 42 formed at an outer periphery of the protrusion 41 so as to be stepped, The ring yoke 50 is configured to be engageable with the outer periphery of the protruding portion 41. When the ring yoke 50 is engaged, the coil 30 coupled to the outer periphery of the yoke shaft 40, The ring yoke 50 may not be directly contacted.

Meanwhile, referring to FIGS. 12 to 13,

The yoke shaft 40 is formed in a T shape and the upper portion of the T-shaped yoke shaft 40 may be configured to replace the function of the ring yoke.

At this time, the yoke shaft 40 may further include a protruding portion that protrudes downward and is pressurized by the riveting punch.

13,

At the lower center of the protrusion, a center groove 43 for guiding the pressing position of the riveting punch during the riveting operation under the pressure by the rivetting punch is further included .

At this time, the lower outer periphery of the protrusion may further include a stepped portion 44 formed at a lower portion of the yoke shaft 40 so as to more firmly engage with the bracket 10 .

14 to 15,

At this time, the weight 70 may further include a vent hole 71 formed in a vertical direction at least at one or more of the outer circumferences.

At least two vent holes 71 may be formed in the outer periphery of the weight 70. When the vent holes 71 are formed of two or more, The air holes 71 are spaced apart from each other along the circumference of the outer periphery of the weight 70 so as to be spaced equidistantly from one another along the circumference, .

Therefore, when the vibrating body vibrates up and down, air flows smoothly inside the bracket 10 and the case 90, and the vibration power is further improved.

16 to 17,

When the magnetic fluid F is applied between the ring yoke 50 and the magnet 80, the central air gap D 'is generated by the magnetic fluid F The air flow is formed through the outer air gap d1.

The center air gap D 'at this time is the distance between the inner periphery of the magnet 80 and the outer periphery of the ring yoke 50 and the outer air gap d1 is the distance between the outer periphery of the weight 70, And the inner circumferential edge of the case 90, as shown in FIG.

At this time, when the interval of the outer air gap d1 is narrow, air damping phenomenon occurs when the vibrating body vibrates, so that the driving time (Rising Time) becomes longer and the vibration power is decreased.

However, when the weight 70 having the vent hole 71 according to the embodiment of the present invention is applied, the flow of air is improved by the vent hole 71 as shown in Fig. 17, The driving time (Rising Time) becomes faster.

At this time, it is preferable that the interval of the outer air gaps d1 according to the embodiment of the present invention is less than half of the interval of the central air gap D '.

That is, the gap condition of the air gap,

(Interval of the outer air gap d1)? (Interval of the center air gap D ') / 2

It is possible to prevent the yoke shaft 40 from being deformed or damaged by a drop impact caused by the vibrating body when the air gap meets the gap condition.

Fig. 18 is a view showing the structure of a conventional weight, Fig. 19 is a view showing a pressure analysis result of the linear type vertical vibration motor according to the present invention in Fig. 16, Fig. 20 is a cross- FIG. 21 is a view showing the result of the load analysis of FIGS. 19 to 20, wherein the upper and lower vibration motors, to which the weight 70 of the present invention is applied, 18 is compared with the load analysis result of the vertical vibration motor to which the weight shown in FIG. 18 is applied, the load value of the vertical vibration motor to which the weight 70 of the present invention is applied is 0.0237 N, The load value of the conventional vertical vibration motor to which the weight is applied is 0.0886 N and the vibration amount of the conventional vertical vibration motor in which the interval of the outer air gap d1 is small is the vibration It can be seen that the inner air is compressed more by the compression of the inner air than the bottom-decelerating motor and the load (force) applied to the weight is higher. Thus, the driving of the vertical vibration motor of the present invention having the outer air gap d1 It is about four times more smooth.

Therefore, the present invention has an effect of providing a linear type vertical vibration motor having a riveting engagement structure that can suppress the occurrence of knitting vibration through a rigid coupling structure and provide a more excellent vibration force.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is not.

10: Bracket
20: F-PCB
30: Coil
40: York shaft
50: Ring York
60: spring
70: Weight
80: Magnet
90: Case

Claims (4)

A bracket 10 for supporting and fixing the F-PCB 20 and the yoke shaft 40 and forming a magnetic field closed loop;
An F-PCB 20 seated on the upper plane of the bracket 10 and supplying an external power source to the coil 30;
And is mounted on the upper surface of the F-PCB 20 so as to surround the outer circumferential surface of the yoke shaft 40. Electric power is supplied from the F-PCB 20 to generate an electromagnetic field, And a coil (30) that acts to amplify the vibration of the vibrating body in the vertical direction,
A part of the bottom surface of the bracket 10 is cut horizontally to form a cutout 11 for riveting,
The yoke shaft 40 has a stepped portion 44 formed at a lower portion of the yoke shaft 40 so as to be engaged with the bracket 10 and a stepped portion 44 is formed at a lower center of the protruding portion P by a riveting punch The protrusion P is pressed by the rivetting punch which rotates and presses when the bracket 10 is engaged with the bracket 10 and the center groove 43 guiding the pressing position of the bracket 10, And the yoke shaft (40) is joined to the bracket (10) by a riveting fitting portion (R) formed by being expanded and deformed around the cutout portion (11) motor.
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