KR102047862B1

KR102047862B1 - Linear vibration motor

Info

Publication number: KR102047862B1
Application number: KR1020130113397A
Authority: KR
Inventors: 서봉구
Original assignee: 주식회사 엠플러스
Priority date: 2013-09-24
Filing date: 2013-09-24
Publication date: 2019-11-22
Also published as: KR20150033411A

Abstract

The present invention relates to a linear vibration motor. Linear vibration motor according to an embodiment of the present invention is composed of a bottom and the side wall surrounding the bottom is a stator including a case having a vibration generating space therein and up and down movement in the center of the spring disposed in the vibration generating space of the case And a vibrator including a yoke having a coupling portion formed at an outer diameter and a weight facing the coupling portion including a weight formed at an inner diameter, and the coupling portion of the yoke and the fixed portion of the weight are formed in a tapered shape. Therefore, the concentricity defect caused by the tolerance during assembly is solved to prevent the generation of touch noise.

Description

LINEAR VIBRATION MOTOR}

The present invention relates to a linear vibration motor.

Vibration motor is a part that converts electrical energy into mechanical vibration by using electromagnetic force generation principle. It is installed in mobile devices to generate silent incoming signal to prevent others from being damaged by external sound. .

That is, the vibration motor is excited by an electromagnetic force having a resonant frequency determined by using a spring and a vibrator suspended from the spring, rather than using a rotation principle of the motor, to generate vibration.

At this time, the spring has a constant K value, and determines the resonance frequency Fn of the vibration motor together with the mass m of the vibrator. In addition, the spring is formed in a coil formed in a coil shape so as to facilitate the movement of the vibrator, which is usually provided in a stator composed of a case and a bracket. ).

On the other hand, mobile devices including smart phones generally adopt a touch screen method, and accordingly, a function for generating vibrations during touch is increasing. Here, the vibration motor performs a haptic (Haptic) function that informs that the touch is touched by the vibration when the touch screen is touched, and also, as described above, is used as a silent incoming alarm function.

Therefore, in order to perform such a function, the vibration motor applies a vibration motor of a vertical linear type, which is disclosed in detail in (Patent Document 1).

According to the (Patent Document 1), the linear vibration motor is disposed inside the oscillator including the yoke (Yoke) and the weight (Weight) to enable vertical movement, the magnet (Magnet) and coil (Coil) in the center of the vibrator By arranging the magnetic circuit system, the maximum displacement occurs at the resonance point when the direct current or the alternating current having a constant frequency is applied, causing mechanical vibration.

KR 2005-0083528 A

The present invention is to improve the touch noise caused by poor concentricity, such as skewed or skewed, by assembling the concentric of the weight moving up and down inside the linear vibration motor.

An aspect of the present invention is to provide a linear vibration motor capable of easily securing concentricity of weights.

In order to achieve the above point of view,

According to an embodiment of the present invention, a linear vibration motor includes a stator including a case having a vibration generating space formed therein by a bottom and sidewalls surrounding the bottom; And

A vibrator including a spring disposed in the vibration generating space of the case, the up and down movement in the center of the spring, the yoke is formed in the outer diameter and the weight formed in contact with the coupling portion and the weight formed in close contact with the inner diameter ;

Including;

The coupling portion of the yoke and the fixing portion of the weight is formed in a tapered shape.

In addition, in the linear vibration motor according to an embodiment of the present invention, the coupling portion and the fixing portion may be narrower toward the upper side and wider toward the lower side based on the horizontal center line of the weight.

In addition, in the linear vibration motor according to an embodiment of the present invention, the yoke may be formed in the assembly portion refracted toward the outer diameter on one surface in close contact with the spring.

In addition, in the linear vibration motor according to an embodiment of the present invention, the stator is installed in the case to cover the vibration generating space;

It may further include.

In addition, in the linear vibration motor according to another embodiment of the present invention, the spring may be a coiled leaf spring.

In addition, in the linear vibration motor according to another embodiment of the present invention, the stator includes a damper provided at the bottom of the case;

It may further include.

These solutions will become more apparent from the following detailed description of the invention based on the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be construed in the usual and dictionary sense, but rather properly define the concept of terms in order for the inventor to best explain his invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

1 is a cross-sectional view showing a linear vibration motor according to an embodiment of the present invention.
2 is a cross-sectional view showing a yoke according to an embodiment of the present invention.
3 is a cross-sectional view showing a weight according to an embodiment of the present invention.
Figure 4 is a cross-sectional view showing an overall assembly state of the linear vibration motor according to an embodiment of the present invention.

Specific aspects and specific technical features of the present invention will become more apparent from the following detailed description and embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as much as possible even if displayed on different drawings. In addition, terms such as “first”, “second”, “one side”, and “other side” are used to distinguish one component from another component, and the component is not limited by the terms. . In describing the present invention, detailed descriptions of related well-known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

A linear vibration motor according to an embodiment of the present invention includes a stator including a case, a spring, a yoke, and a weight assembled to the yoke. By improving the assembling structure of a vibrator including a taper to form the inner and outer diameters of the yoke and the weight to face each other, the bias due to the tolerance (±) during the assembly is not generated. That is, the concentricity of the weight and the case is secured, and thus, as an example, the generation of touch noise can be prevented.

The stator is provided to allow the vibrator to be installed and to install the linear vibration motor in an external set, and thus includes a case. In addition, the stator may include a magnetic circuit system to provide a vibrator with electromagnetic force. An armature including magnets and coils for excitation may be installed inside.

In addition, the stator may include a bracket (Bracket) with the case, to cover the case through the bracket to seal the inside, connected to the coil constituting the armature to apply a direct current or alternating current having a constant frequency Flexible printed circuit board (FPCB) to support.

The vibrator generates vibration through vertical movement in the case, and includes a spring, a yoke, and a weight.

In this case, the weight is spaced apart from the side wall of the case by about 0.1 mm in accordance with the miniaturization and thinning of the linear vibration motor. Thus, when the case and the weight of the weight are not secured, the side wall and the side wall are vibrated in the vibrator process. Friction causes touch noise.

That is, in order to prevent such touch noise, it is necessary to maintain the distance between the weight and the side of the case. Here, the conventional weight is formed using a metal material including tungsten so that a certain mass can be easily added when the magnetic field is formed by an armature. The weight can be interpreted as deviation or distortion due to tolerance (±) during assembly. The concentricity defect is occurring, which is inadequate for maintaining the gap.

More specifically, the yoke in which the weight and the wake are normally assembled is assembled by close contact between the outer diameter and the inner diameter, and the outer diameter of the yoke and the inner diameter of the weight are formed in a straight line, so that the tolerance at the time of assembly (±) Due to the concentricity defects are generated, and as a result, touch noise is generated while the weight collides with the side wall during the vertical movement of the vibrator.

Therefore, the linear vibration motor according to an embodiment of the present invention is formed into a tapered shape in which the outer diameter of the yoke and the inner diameter of the weight can be interpreted as diagonal lines, thereby preventing the occurrence of such touch noise, and also reducing the horizontal center line of the weight. As a reference, the taper is tapered to become narrower toward the upper side and wider toward the lower side, so as to facilitate the assembly of the yoke and the weight.

On the other hand, the yoke may be provided with one surface in close contact with the spring bent toward the outer diameter, which is in close contact with the nature of the yoke assembled by bonding or the like in the center of the coiled leaf spring adopted as the spring. This is because the wider the easier assembly.

In addition, the stator may be provided with a damper (Damper) formed of a material such as soft synthetic resin or rubber therein, through which, for example, to prevent noise caused by the contact of the vibrator and the stator during the vertical movement of the vibrator It can be effective.

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

As shown in FIG. 1, the case 111 constituting the stator 110 includes a bottom 111a and sidewalls 111b surrounding the bottom 111a to form a vibration generating space 111c therein. That is, the case 111 has an upper portion open to the outside in the drawing, and accommodates the spring 121, the yoke 122, and the weight 123 constituting the vibrator 120 in the vibration generating space 111c therein. You will be able to install it.

The spring 121 employs a coil spring formed in a coil shape, and is fixed to the bottom 111a of the case 111, and the center of the spring 121 is spaced apart from the bottom 111a so that the yoke 122 and the weight are formed. The up and down movement of 123 is supported. A lower portion of the yoke 122 is assembled to a central portion of the spring 121, and a weight 123 is assembled to an outer diameter of the yoke 122.

Here, the yoke 122 and the weight 123 are assembled by bringing the coupling part 122a formed at the outer diameter of the yoke 122 into close contact with the fixing part 123a formed at the inner diameter of the weight 123. The coupling part 122a and the fixing part 123a are formed to face each other.

2 to 3, the yoke 122 has a coupling portion 122a formed at an outer diameter, and an assembly 122b closely contacted with a central portion of the spring 121 is bent in an outer diameter direction. It is formed in a cylindrical shape. The weight 123 is formed in a ring shape in which a fixing part 123a closely attached to the coupling part 122a is formed at an inner diameter.

Here, the coupling part 122a and the fixing part 123a are formed narrower toward the upper side and wider toward the lower side based on the horizontal center line C of the weight 123. Therefore, the assembly is made by fitting the weight 123 to the yoke 122, and after assembling the yoke 122 to the spring 121, the weight 123 enters from the upper direction to be assembled. do.

As described above, the yoke 122 and the weight 123 are formed in the inner and outer diameters, and the coupling part 122a and the fixing part 123a, which are in close contact with each other, are formed in a tapered shape, such that the yoke 122 and the weight 123 are distorted or biased due to tolerances (±). The concentricity of the can be prevented, and it is possible to provide ease in mutual assembly.

As shown in FIG. 4, the linear vibration motor 100 has a spring in the vibration generating space 111c formed inside the case 111 in a state in which the damper 113 is assembled to the bottom 111a of the case 111. 121 is assembled, the lower part of the yoke 122 and the assembling part 122b are assembled in close contact with the center of the spring 121, and the weight of the weight 123 is fastened to the engaging part 122a of the yoke 122. The government 123a will be assembled in a close contact. Then, the bracket 112 is assembled on the case 111 to cover the vibration generating space 111c.

Here, the armature 130 is disposed in the center of the vibration generating space 111c to form a magnetic circuit system, and the flexible circuit board 131 electrically connected to the armature 130 is provided at the bracket 112. Done.

Therefore, the linear vibration motor 100 according to an embodiment of the present invention generates the vibration while the vibrator 120 moves up and down by the electromagnetic force of the armature 130, as described above, the concentricity of the weight 123 As a result of the securing, the weight 123 may prevent generation of touch noise generated by hitting the side wall 111b of the case 111.

Although the present invention has been described in detail by way of examples, it is intended to describe the present invention in detail, and the linear vibration motor according to the present invention is not limited thereto, and the general knowledge of the art within the technical spirit of the present invention is provided. It is obvious that modifications and improvements are possible by those who have them.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of the present invention will be apparent from the appended claims.

100-Linear Vibration Motor 110-Stator
111-Case 111a-Bottom
111b-side wall 111c-vibration generating space
112-Bracket 113-Damper
120-Oscillator 121-Spring
122-yoke 122a-coupling
122b-Assembly 123-Weight
123a-fixing part 130-armature
131-Flexible Circuit Board C-Horizontal Center Line

Claims

A stator comprising a bottom and a side wall surrounding the bottom, the stator including a case having a vibration generating space therein; And
A spring disposed in the vibration generating space of the case, provided in the center of the spring so as to be able to move up and down, a yoke having a coupling part in the outer diameter and a weight in which the fixing part facing the coupling part is formed in the inner diameter. Vibrator including;
Including,
The coupling portion of the yoke and the fixing portion of the weight,
The entire faces facing each other are formed in a taper shape,
The linear vibration motor is formed to be narrower toward the upper side and wider toward the lower side based on the horizontal center line (C) of the weight over the entire surface facing each other.

delete

The method according to claim 1,
The yoke is a linear vibration motor having an assembled part refracted toward the outer diameter on one surface in close contact with the spring.

The method according to claim 1,
The stator is installed on the case to cover the vibration generating space (Bracket);
Linear vibration motor further comprising.

The method according to claim 1,
The spring is a linear vibration motor is a coil spring.

The method according to claim 1,
The stator includes a damper provided at the bottom of the case;
Linear vibration motor further comprising.