KR101752718B1 - Linear vibrator - Google Patents

Abstract

According to the present invention, there is provided a linear vibrator having a permanent magnet, a coil, and a power connection portion inside a case, and a motion portion being vertically vibrated by an electromagnetic force acting between the coil and the permanent magnet when power is input from the outside through a power connection portion The use of the coil yoke of the magnetic material inside the coil enables a compact and lightweight structure having a highly efficient electromagnetic field structure and is designed so that no micro-electromagnetism or internal shock due to internal cogging force is used. In particular, since the motion part is separated from the impact transmission member, the elastic force of the impact transmission member is connected to the motion part to suppress the resonance to the utmost. Therefore, the moving part is reciprocated by the input frequency applied to the coil, but has a high vibration characteristic over a wide frequency range, thereby controlling the vibration characteristic over a wide frequency range.

Description

[0001] The present invention relates to a linear vibrator,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear vibrator, and more particularly, to a linear vibrator that is designed to be mounted on a personal portable terminal, a game machine, a remote controller, or the like.

In general, one of the functions necessary for a communication device is a receiving function. The most commonly used types of incoming calls are vocal functions such as melody and bell, and vibration that shakes the device. In particular, the vibration function is mainly used when the melody or bell is transmitted to the outside through the speaker to avoid damage to the other person. For this vibration, a small vibrator is driven so that the driving force is transmitted to the case of the device So that the device can vibrate.

In addition, in recent years, as the spread of the touch screen mobile phone is increasing, the vibrator is required to have a function of providing a virtual touch feeling to the user beyond a receiving function instead of a melody. That is, a vibrator mounted on a mobile phone or a game machine is required to have a long life, small size, and excellent vibration performance. In particular, there is a need to vary the operating frequency to generate vibration to vary the bodily sensation vibration.

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Conventionally, a vibration motor that is applied to a mobile phone generates a rotational force to obtain a mechanical vibration by using a rotating part of an unbalanced mass. Most of the vibration motors used in this case use a brush and a commutator to supply current.

1 is a sectional view showing a conventional rotary type vibrator, and Fig. 2 is a view showing an FPCB in Fig.

Referring to the drawing, a method of supplying external power to a coil 25 provided in a moving body 20 in a conventional rotary vibrator 10 is as follows.

 Power is first supplied to the rotary type vibrator 10 through the lead wire 17 fixed to the case 11. [ The lead wire 17 is electrically connected to an FPCB (Flexible Printed Circuit Board) 15 by a method such as soldering. A circuit pattern as shown in FIG. 2 is formed so that electricity can be connected to the FPCB 15 do.

2, the FPCB 15 includes a lead wire connection terminal 15a electrically connected to the lead wire 17 at one end thereof and a power connection terminal connection terminal 15a electrically connected to the brush type power supply connection portion 19 at the other end thereof. (15b) are formed.

On the other hand, the coil 25 is located in the moving body 20, and the coil 25 is electrically connected to the circuit board 15. The conventional rotary type vibrator 10 configured as described above is mounted on the circuit board 15 disposed on the moving body 20 through the FPCB 15 and the brush type power connection portion 19 when external power is supplied through the lead 17, . The power supplied to the circuit board 13 of the moving body 20 is transmitted to the coil 25 electrically connected to the circuit board 15. [

When power is applied from the outside, the moving body 20 and the circuit board 15 are rotated by the electromagnetic force to generate vibration, and the brush type power connection unit 19 and the circuit board 15 are electrically connected while performing a friction movement.

However, in such a structure, it is difficult for the moving body 20 to rotate about the shaft 21 so that the vibrating direction vibrates in two directions, and vibration is generated only in one axis. By using the torque, it is not suitable for the function that requires quick response because of the inertia of the rotor due to its low responsiveness. In addition, there is a problem that the lifetime is shortened due to the mechanical friction generated by using the brush and the commutator.

3 is an example of a conventional linear reciprocating vibrator. A case 510 having a predetermined space therein and a magnet yoke 514 disposed in an inner space of the case 510. A permanent magnet 513 is disposed inside the magnet yoke 514, And constitutes a magnetic circuit portion 516 which is mounted and produces a magnetic field of a constant intensity.

And a vibration generating coil 525 disposed with a clearance from the permanent magnet 513 and generating an electric field when power is applied. And a power connection unit 515 configured to apply power to the coil 525. [ Usually, the power connection 515 uses a flexible circuit board.

And a spring member 523 fixed to the lower end of the case 510 and fixed to the magnetic circuit portion 516 is mounted. The mass portion 521 integrally mounted to the magnetic circuit portion 516 constitutes a moving portion 512 that vibrates vertically using the elasticity of the spring member 523 together with the magnetic circuit portion 516.

Therefore, the resonator uses the resonance characteristics and the resonance frequency has the following characteristics.

Resonant frequency = C * Root (k / M): C-constant, M-mass, k-spring constant

Therefore, it can be seen from the above equation that the resonance frequency changes when the mass or spring constant changes. That is, a spring member 523 is connected between the moving part 512 and the case 510 to exhibit mutual resonance characteristics and reciprocating motion. In other words, it exhibits high efficiency vibration characteristics compared to input in resonance frequency band, and has low efficiency and relatively low vibration characteristics other than resonance point, so that it is practically used only in the reference frequency band.

That is, the frequency use range is almost fixed with a very narrow bandwidth in the vicinity of the resonance frequency, and the usable frequency range near the resonance frequency does not exceed 20 Hz.

Therefore, various vibration control through frequency control is impossible. Accordingly, there is a problem in varying the frequency of the bodily sensation by varying the vibration frequency by varying the operating frequency.

SUMMARY OF THE INVENTION The present invention has been conceived in order to solve the problems of the conventional art described above, and it is an object of the present invention to provide a permanent magnet, a coil, and a power connection portion inside a case, In a linear vibrator in which a mass is vertically vibrated by an electromagnetic force, a coiled yoke of a magnetic body is used inside a coil to have a high-efficiency electromagnetic field structure and a compact and lightweight structure. Cogging force is generated between the permanent magnet and the coil yoke, So that no micro-electromagnetism or an external shock can be generated. In particular, since the motion part is separated from the impact transmission member, the elastic force of the impact transmission member is connected to the motion part to suppress the resonance to the utmost. It is therefore an object of the present invention to provide a linear vibrator that controls oscillation characteristics over a wide frequency range by causing the moving part to reciprocate by the input frequency applied to the coil, but exhibiting a high vibration power over a wide frequency range.

In order to achieve this object, a case having a predetermined space therein,

A magnetic yoke disposed in an inner space of the case, a magnetic circuit unit mounted with a permanent magnet on the magnet yoke to generate a magnetic field of a predetermined intensity, a coil yoke disposed adjacent to the permanent magnet with a gap therebetween, A power supply connection unit configured to apply power to the coil, a bracket formed integrally with the power connection unit, a support shaft provided between the case and the bracket,

And a moving part having a mass body integrally mounted with the permanent magnet and reciprocating by an electromagnetic force generated from the coil, the moving part being connected to the bearing, And an impact transmission member installed in the body and transmitting the vibration force to the outside by collision with the motion part when the motion part reciprocates.

Further, the coil yoke has an inner hole and is arranged in a direction perpendicular to the direction of motion of the moving part. And the permanent magnet is magnetized in a direction perpendicular to a moving direction of the moving part.

The coil yoke may be supported by a coil yoke support.

The coil yoke has an inner hole and can be directly fixed to the case or the bracket by integrally forming the motion direction of the motion part and the shape perpendicular to the motion part. The impact transmission member is characterized in that the member is fixed to the bracket or the inner surface of the case and has an elastic force.

The impact transmitting member may be a coil spring or a leaf spring made of a metal material, and the impact transmitting member may be made of silicone or resin depending on the structure.

And a sound attenuating member is disposed between the impact transmitting member and the motion portion. The noise attenuating member is characterized by using silicon or resin. The impact transmitting member may be fixed to the case or one side of the bracket by welding, caulking, brazing or bonding.

According to the present invention, there is provided a linear vibrator having a permanent magnet, a coil, and a power connection portion inside a case, and a motion portion being vertically vibrated by an electromagnetic force acting between the coil and the permanent magnet when power is input from the outside through a power connection portion The use of a coil yoke of a magnetic material inside a coil enables a compact and lightweight structure having a highly efficient electromagnetic field structure and has been invented so that no microvibration due to internal micro-electromotive force or external impact can be obtained by using cogging force. In particular, since the motion part is separated from the impact transmission member, the elastic force of the impact transmission member is connected to the motion part to suppress the resonance to the utmost. Therefore, the moving part reciprocates by the input frequency applied to the coil, but has a high vibration characteristic over a wide frequency range, thereby controlling various vibration characteristics over a wide frequency range.

1 is a sectional view showing a conventional rotary type vibrator.
Fig. 2 is a view showing the FPCB of Fig. 1; Fig.
Figure 3 is a view of the rotor of Figure 1;
4 is a cross-sectional view according to an embodiment of the present invention.
5 is an exploded perspective view of FIG. 4 according to an embodiment of the present invention.
Figure 6 is a perspective view of the motion portion structure of Figure 4 according to an embodiment of the present invention.
7 is a cross-sectional view of an embodiment of the impact transmitting member according to the present invention
8 is a graph showing the vibration-frequency characteristic curve

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

4 is a cross-sectional view according to an embodiment of the present invention

5 is an exploded perspective view of FIG. 4 according to an embodiment of the present invention

Figure 6 shows the structure of the moving part of Figure 4 according to an embodiment of the present invention. According to the drawing

A case 110 having a predetermined space therein and a magnet yoke 114 disposed in an inner space of the case 110. A permanent magnet 113 is mounted inside the magnet yoke 114 to generate magnetic force And constitutes a magnetic circuit portion 116 for producing a magnetic field. The magnetic circuit unit 116 surrounds the coil yoke 127 by passing the magnetic flux generated from the permanent magnet 113 mounted on the magnet yoke 114 through the coil yoke 127, And then to the permanent magnet 113 again.

A vibration generating coil 125 which is disposed in the permanent magnet 113 and wound on the magnet yoke 114 to generate an electric field when power is applied is mounted. And a power connection unit 115 configured to apply power to the coil 125. [ Usually, the power connection unit 115 uses a flexible circuit board. Particularly, the power connection part 115 is disposed in the escape groove 133 formed in the bracket 111 to maximize the moving space of the moving part 112.

The coil 125 is attached to the permanent magnet 113 by adjusting the height of the permanent magnet 113 and the optimal magnetic circuit 116 by using the coil support 126. If the coil support 126 is not provided, the fixing height of the coil yoke 127 is determined by the height of the coil 125, and the coil 125 is directly fixed to the bracket 111.

Therefore, it becomes difficult to configure the desired optimum electromagnetic circuit. Therefore, in order to make the product as slim as possible, the position of the coils 125 and the coil yoke 127 is optimized by adjusting the positions of the magnetic poles of the permanent magnets 113 by using the coil supporter 126, It is possible to reduce the resistance and maximize the efficiency. The coil supporter 126 is integrally formed with the power connection part 115 and the bracket 111.

And a moving part 112 having a mass body 121 integrally mounted to the magnetic circuit part 116 and vibrating up and down in a sliding motion along the support shaft 250 by using the bearing 240 together with the magnetic circuit part 116, . The supporting shaft 250 supports the moving part through the bearing 240 so that the moving part 112 can move up and down at a predetermined position.

The case 110 may be configured to prevent the direct contact between the case 110 and the bracket 111 when the moving part 112 vibrates up and down and transmit the vibration due to the impact to the outside of the case 110 or the bracket 111. [ Or the impact transmitting member 300 is disposed between the bracket 111 and the moving part 112. [

Particularly, according to the present invention, the motion part 112 is separated from the impact transmission member 300 so that the motion part 112 reciprocates by the signal input through the power connection part 115, So that the influence of the elasticity of the impact transmission member 300 is minimized so that the vibration characteristic according to the input frequency can be freely

. That is, the resonance characteristics between the moving part 112 and the impact transmitting member 300 are minimized.

A cogging force is generated between the permanent magnet 113 and the coil yoke 127 disposed in the moving part 112 by a magnetic force. Therefore, the cogging force fixes the moving part 112 at a stable position and suppresses the residual vibration of the moving part 112 due to an external impact or a fine electromagnetic force. In addition, the response characteristic is improved and the falling time is reduced.

The permanent magnet 113 is magnetized in a direction perpendicular to the moving direction of the moving part 112 and is magnetized to a plurality of poles for optimum electromagnetic circuit configuration through the coil yoke 127. [ The coil yoke 127 used here is ferromagnetic iron.

Particularly, since the coil yoke 127 is constituted by an optimum magnetic circuit by using the ferromagnetic material, the influence of the frictional force between the support shaft 250 and the bearing 240 and the cogging force is reduced and generated by the coil 125 according to the input signal. The motion unit 112 moves along the wide frequency band in accordance with the input signal and is arranged in such a structure as to give a high impact amount to the impact transmission member 300 while reciprocating.

7 is an embodiment of the impact transmission member 300 according to the present invention.

Basically, it is important that the impact transmitting member 300 is operated with elasticity so that it does not generate noise. Figure 7 (C) is made using the elasticity of the raw materials. A shock generated between the moving part 112 and the impact transmitting member 300 when the moving part 112 reciprocates with a suitable elasticity using a silicone material or a rubber material is applied to the case 110 or the bracket 111 To reduce noise while transmitting to outside. 7 (a) and 7 (b), the shock transmission member 300 is a spring. The spring used herein may be a metallic coil spring or a leaf spring.

And a separate sound attenuating member 310 is used to reduce noise due to an impact generated between the motion unit 112 and the impact transmission member 300 when the motion unit 112 reciprocates. At this time, silicone or rubber may be used as the noise attenuating member 310.

8 is a vibration-frequency characteristic curve according to the present invention.

The linear vibrator using the normal resonance characteristics can be used between the frequency f1 and the frequency f2, assuming the reference vibration amount usable in the product, as seen from the characteristic 2 in Fig.

In other words, it is common to use fixed fc resonance frequency on actual products. In this case, it is possible to obtain a vibration characteristic with high efficiency, but the vibration amount is small in a frequency band lower than the frequency f1 or a frequency band higher than the frequency f2, and therefore, it is practically difficult to use. Therefore, as a vibrator used for a mobile phone or a game machine, the vibration pattern is monotonous and the use frequency is almost fixed. In the case of the present invention, as in the characteristic 1 of Fig. 8, the difference in the vibration amount is not large from the low frequency band to the resonance frequency fc with the highest vibration amount, and represents the vibration amount not less than the reference vibration amount. In particular, when the moving part 112 reciprocates, the amount of vibration generated during the impact is transmitted to the outside through the impact transmitting member 300, .

Therefore, it can be used relatively freely below the f2 frequency, which is the frequency region where the vibration amount is higher than the reference vibration amount. As a result, vibrator operation can be performed at various frequencies, so that vibration patterns can be varied and vibrations having a three-dimensional effect can be generated.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention .

100: Linear vibrator
110: Case 111: Bracket
112: motion part 113: permanent magnet
114: magnet yoke 114a: lower plate
115: power connection part 116: magnetic circuit part
120: damping member 121: mass body
123: spring member 125: coil
126: coil support 127: coil yoke
200: Weight adjusting groove 240: Bearing
250: support shaft 300: impact transmission member
310: Noise reduction member

Claims (11)

A case having a predetermined space therein,
A magnet yoke disposed in an inner space of the case,
A magnetic circuit for mounting a permanent magnet on the magnet yoke to generate a magnetic field of a predetermined intensity,
A coil yoke disposed adjacent to the permanent magnet with a gap therebetween,
A coil wound around the coil yoke and generating an electromagnetic field when the power is applied,
A power connection configured to apply power to the coil,
A bracket integrally formed with the power connection portion,
A support shaft provided between the case and the bracket,
A bearing provided so as to be able to slide along the support shaft,
And a moving part having a mass body integrally mounted with the permanent magnet and reciprocating by an electromagnetic force generated from the coil,
Wherein the coil yoke is disposed in a direction perpendicular to a direction of motion of the motion portion,
And a shock transmission member installed in the case or the bracket and transmitting a vibration force generated by collision of the motion part with the motion part when the movement part reciprocates, to the outside.
delete The method according to claim 1,
Wherein the permanent magnet is magnetized in a direction perpendicular to a moving direction of the moving part.
The method according to claim 1,
Characterized in that the coil yoke is supported by a coil yoke support
The method according to claim 1,
Wherein the coil yoke has an inner hole and forms a shape in which a direction of movement of the moving part and a shape perpendicular to the moving part are integrally formed.
The method according to claim 1,
Wherein the impact transmission member is fixed to the bracket or the inner surface of the case and has an elastic force.
The method according to claim 1,
Characterized in that a coil spring or a leaf spring made of a metal material is used as the impact transmitting member
The method according to claim 1,
Characterized in that the impact transmitting member uses silicon or resin.
The method according to claim 1,
And a sound attenuating member is disposed between the impact transmitting member and the moving unit.
10. The method of claim 9,
Wherein the noise attenuating member is made of silicon or resin.
The method according to claim 1,
Characterized in that the impact transmission member is fixed to one side of the case or the bracket by welding, caulking or bonding.

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