KR20120053911A - Linear vibrator - Google Patents

Abstract

PURPOSE: A linear vibrator is provided to control various vibration properties through a wide frequency range by enabling a motion unit to have a high vibration property through the wide frequency range. CONSTITUTION: A case(110) includes a predetermined space inside. A magnet yoke(114) is arranged in the case. A permanent magnet(113) is installed in an inner side of the magnet yoke. A magnetic circuit unit passes magnet flux generated from the permanent magnet mounted on the magnet yoke through a coil yoke(127). A coil(125) for generating vibration is rolled around the yoke to generate an electric field. A power connecting unit(115) is formed to apply power to the coil. The power connecting unit is arranged in an escape groove(133) formed on a bracket(111).

Description

Linear vibrator

The present invention relates to a linear vibrator, and more particularly, to a linear vibrator which is designed to vibrate mounted on a personal portable terminal, a game machine or a remote control.

In general, one of the essential functions of a communication device is an incoming call function. The most common types of incoming calls are vocalizations such as melodies and bells, and vibrations that cause the device to shake. In particular, the vibration function is mainly used when a melody or a bell is transmitted to the outside through a speaker to avoid damage to others. For this vibration, a small vibrator is driven to transmit the driving force to the case of the device. It is common for the device to vibrate.

In addition, in recent years, as the spread of touch screen mobile phones increases, a vibrator is required to provide a virtual touch feeling to a user beyond a reception function instead of a melody. In other words, the vibrator mounted in the mobile phone or game machine is required for long life, small size, and excellent vibration performance. In particular, there is a need to vary the operating frequency by generating vibration by varying the operating frequency.

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

1 is a cross-sectional view showing a conventional rotary vibrator, Figure 2 is a view showing the FPCB of FIG.

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

 First, power is supplied to the rotary vibrator 10 through the lead wire 17 fixed to the case 11. The lead wire 17 is electrically connected to the FPCB (Flexible Printed Circuit Board) 15 by soldering or the like, and the circuit pattern as shown in FIG. 2 is formed on the FPCB 15 so as to be electrically connected. do.

Referring to FIG. 2, the FPCB 15 has a lead wire connecting terminal 15a electrically connected to the lead wire 17 at one end thereof, and a power connector connecting terminal electrically connected to the brush type power connector 19 at the other end thereof. 15b is formed.

On the other hand, a coil 25 is located on the moving body 20, and the coil 25 is electrically connected to the circuit board 15. In the conventional rotary vibrator 10 configured as described above, when external power is supplied through the lead wire 17, the circuit board 15 disposed on the moving body 20 through the FPCB 15 and the brush-type power connection unit 19. Is passed on. Then, the power delivered to the circuit board 13 of the moving body 20 is delivered 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, and vibration is generated. The brush-type power connection unit 19 and the circuit board 15 are electrically connected while performing frictional motion.

However, such a structure is difficult to generate the vibration only in one axis by vibrating in two axes as the moving body 20 rotates around the shaft 21. In addition, by using the rotational force, the inertia of the rotor is poor in responsiveness, which is not suitable for a function requiring fast response. In addition, there is a problem of shortening the life due to the mechanical friction caused by using a brush and a commutator.

3 is an example of a conventional linear reciprocating vibrator. Referring to the drawings, there is a case 510 having a predetermined space therein, and a magnet yoke 514 disposed in an inner space of the case 510, and a permanent magnet 513 inside the magnet yoke 514. It is mounted to constitute a magnetic circuit portion 516 to create a magnetic field of a certain intensity.

The permanent magnet 513 is disposed with a gap and is equipped with a vibration generating coil 525 for generating an electric field when power is applied. And a power connection 515 configured to apply power to the coil 525. Usually, the power connection 515 uses a lot of flexible circuit boards.

In addition, a spring member 523 fixed to the bottom of the case 510 and fixed to the magnetic circuit unit 516 is mounted. In addition, the moving part 512 which has a mass body 521 integrally mounted to the magnetic circuit part 516 and vibrates up and down by using the elasticity of the spring member 523 together with the magnetic circuit part 516.

Therefore, the vibrator uses a resonance characteristic and the resonance frequency has the following characteristics.

Resonance 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 the spring constant changes. That is, the spring member 523 is connected to each other between the movement part 512 and the case 510 to exhibit a mutual resonance characteristic and to perform a reciprocating motion. In other words, it exhibits high efficiency vibration characteristics compared to the input in the resonant frequency band, and has low efficiency and relatively low vibration characteristics except for the resonance point, and is only used in the reference frequency band.

That is, the frequency usage range is almost fixed with a very narrow bandwidth near the resonance frequency, and the usable frequency range around the resonance frequency usually does not exceed 20 Hz.

Therefore, various vibration control through frequency control is impossible. Therefore, there is a problem in varying the feeling of haptic vibration by varying the vibration by varying the operating frequency.

The present invention has been made to solve the above-described problems of the prior art, having a permanent magnet, a coil and a power connection in the interior of the case, when the power is input from the outside through the power connection to act between the coil and the permanent magnet In the linear vibrator in which the mass vibrates vertically due to the electromagnetic force, the magnetic coil coil yoke is used inside the coil, so that it has a highly efficient electromagnetic structure and a compact and lightweight structure. It is designed to generate vibration to support the internal micro electromagnetic force or external shock. In particular, since the moving part is configured to be separated from the shock transmitting member, the elastic force of the shock transmitting member is connected to the moving part to suppress the resonance. Accordingly, an object of the present invention is to provide a linear vibrator that performs a reciprocating motion by an input frequency applied to a coil, but exhibits a high vibration force characteristic over a wide frequency range, thereby controlling vibration characteristics over a wide frequency range.

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

A magnet yoke disposed in the inner space of the case, a magnetic circuit unit having a permanent magnet mounted to the magnet yoke to create a magnetic field of a predetermined intensity, a coil yoke disposed adjacently with a gap with the permanent magnet, and wound around the coil yoke A coil that generates an electromagnetic field when applied, a power connector configured to apply power to the coil, a bracket integrally formed with the power connector, a support shaft installed between the case and the bracket,

A bearing installed to slide along the support shaft, and having a mass body integrally mounted with the permanent magnet, coupled to the bearing to move back and forth by electromagnetic force generated from the coil, and to the case or the bracket. It is characterized in that the movement portion includes a shock transmission member for transmitting the vibration force to the outside by collision with the movement portion during the reciprocating motion.

In addition, the coil yoke is characterized in that the hole is disposed in the direction perpendicular to the direction of movement of the movement portion. The permanent magnet is magnetized in a direction perpendicular to the direction of movement of the moving part.

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

In addition, the coil yoke may have a hole in the inner side and may be directly fixed to the case or bracket by integrally forming the movement direction of the moving part and the shape perpendicular to the moving part. The shock transmission member is characterized in that the member is fixed to the inner surface of the bracket or the case and has an elastic force.

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

The noise attenuation member may be disposed between the impact transmission member and the movement part. The noise attenuation member is characterized by using silicone or resin. The shock transmitting member may be fixed to the case or one side of the bracket by welding, caulking, soldering, or bonding.

According to the present invention, the case is provided with a permanent magnet, a coil and a power connection inside the case, when power is input from the outside through the power connection to the linear vibrator vibrating vertically by the electromagnetic force acting between the coil and the permanent magnet In this case, by using a coil yoke of a magnetic material inside the coil, it is possible to have a highly efficient electromagnetic structure and to have a compact and light weight structure, and to use the cogging force so that there is no vibration even in the internal micro electromagnetic force or external impact. In particular, since the moving part is configured to be separated from the shock transmitting member, the elastic force of the shock transmitting member is connected to the moving part to suppress the resonance. As a result, the moving part reciprocates by the input frequency applied to the coil, but has a high vibration force characteristic over a wide frequency range, thereby controlling various vibration characteristics over a wide frequency range.

1 is a cross-sectional view showing a conventional rotary vibrator.
FIG. 2 shows the FPCB of FIG. 1. FIG.
3 shows the rotor of FIG. 1.
4 is a cross-sectional view according to an embodiment of the present invention.
5 is an exploded perspective view of FIG. 4 in accordance with an embodiment of the present invention.
6 is a structure of the moving part of Figure 4 according to an embodiment of the present invention
7 is an embodiment of the shock transmission member according to the present invention
8 is a vibration-frequency characteristic curve according to the present invention

Hereinafter, exemplary 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 in accordance with an embodiment of the present invention.

6 is a view illustrating a structure of the moving part of FIG. 4 according to an embodiment of the present invention. According to the drawing

There is a case 110 having a predetermined space therein, and a magnet yoke 114 disposed in the inner space of the case 110, and a permanent magnet 113 is mounted inside the magnet yoke 114 to have a predetermined strength. The magnetic circuit unit 116 for generating a magnetic field is configured. The magnetic circuit unit 116 bridges the coil 125 wound around the coil yoke 127 while the magnetic flux generated from the permanent magnet 113 mounted on the magnet yoke 114 passes through the coil yoke 127. And it is configured to flow through the permanent magnet 113 again.

The vibration generating coil 125 is disposed in the permanent magnet 113 and wound around the yoke 114 to generate an electric field when power is applied. And a power connection unit 115 configured to apply power to the coil 125. Usually, the power connection unit 115 uses a lot of flexible circuit boards. In particular, the power connection unit 115 is disposed in the escape groove 133 formed in the bracket 111 to maximize the movement space of the movement unit 112.

Coil 125 is to adjust the height to attach the permanent magnet 113 and the optimum magnetic circuit portion 116 by using the coil support 126. If the coil support 126 is not present, the fixed height of the coil yoke 127 is determined by the height of the coil 125, and the coil 125 is fixed directly to the bracket 111.

Therefore, it becomes difficult to construct the desired optimum electromagnetic circuit. Therefore, if you want to configure the product as thin as possible as thin as possible using the coil support 126 to optimize the position of the coil 125 and the coil yoke 127 in accordance with the magnetic pole position of the permanent magnet 113 and unnecessary coil 125 By eliminating the winding part of the wire, the resistance can be reduced and the efficiency can be maximized. And the coil support 126 is formed integrally with the power connection portion 115 and the bracket 111.

And the movement unit 112 having a mass body 121 integrally mounted to the magnetic circuit portion 116 and vibrating up and down by sliding along the support shaft 250 using the bearing 240 together with the magnetic circuit portion 116. Configure The support 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 to prevent the direct contact between the case 110 or the bracket 111 during the vertical vibration and to transmit the vibration due to the shock to the outside of the case 110 or the bracket (11). Or an impact transmission member 300 is disposed between the bracket 111 and the movement part 112.

In particular, the present invention is the movement portion 112 is not coupled to the shock transmission member 300 is disposed separately so that the movement portion 112 reciprocates by the signal input through the power connection portion 115, but the shock transmission member 300 By not being combined with) the vibration characteristics according to the input frequency can be freely minimized by minimizing the influence of the elasticity of the impact transmission member 300

It is designed to represent. That is, the resonance characteristic between the movement part 112 and the impact transmission member 300 is minimized.

And a cogging force is generated between the permanent magnet 113 and the coil yoke 127 disposed in the movement unit 112 by the magnetic force. Therefore, the cogging force is fixed to the moving part 112 in a stable position to suppress the residual vibration of the moving part 112 due to external impact or minute electromagnetic force, increase the response characteristics and in particular the falling time (Falling Time).

The permanent magnet 113 is magnetized in the direction perpendicular to the direction of motion of the movement unit 112, and was formed by magnetizing a plurality of poles for the optimal electromagnetic circuit configuration through the coil yoke (127). The coil yoke 127 used herein uses iron, which is a ferromagnetic material.

In particular, the coil yoke 127 is formed of a ferromagnetic material to form an optimal magnetic circuit, thereby reducing the influence of the frictional force between the support shaft 250 and the bearing 240 and the cogging force and being generated by the coil 125 according to an input signal. Since the movement unit 112 is well followed by the electromagnetic force, the movement unit 112 reciprocates according to the input signal over a wide frequency band, and is arranged in a structure capable of giving a high impact amount to the impact transmission member 300.

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

Basically, the shock transmitting member 300 should be elastic and operate, but it is important to prevent noise. (C) of FIG. 7 is made using the elasticity which a raw material has. For example, using a silicon material or a rubber material has a suitable elasticity and the case 112 or the bracket 111 to the impact generated between the movement portion 112 and the impact transmission member 300 during the reciprocating movement of the movement portion 112 Through the outside to reduce noise. And (a) and (b) of Figure 7 used a spring as the impact transmission member (300). As the spring used herein, a metallic coil spring or a leaf spring may be used.

In addition, the movement part 112 is a case in which a separate noise attenuation member 310 is used to reduce noise caused by the impact generated between the movement part 112 and the impact transmission member 300 during the reciprocating motion. In this case, silicon or rubber may be used as the noise attenuation member 310.

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

The linear vibrator using the normal resonance characteristic can be used between the f1 frequency and the f2 frequency assuming the reference vibration amount usable in the product as shown in the characteristic 2 of FIG. 8.

That is, it is common to use it at the fc resonant frequency in real products. In this case, vibration characteristics having high efficiency can be obtained. However, in the frequency band lower than the f1 frequency or the frequency band higher than the f2 frequency, the vibration amount is difficult to use practically. Therefore, as a vibrator used in mobile phones, game machines and the like, the vibration pattern is monotonous and the use frequency is almost fixed. In the present invention, as shown in the characteristic 1 of FIG. 8, the difference in vibration amount from the low frequency band to the resonance frequency fc having the highest vibration amount is not large, and the vibration amount is higher than the reference vibration amount. It is designed to reciprocate freely according to the input frequency without the movement part 112 is coupled to the elastic body and does not operate, and in particular, the amount of vibration generated during the impact while the movement part 112 reciprocates through the impact transmission member 300. Because to pass to.

Therefore, it can be used relatively freely below the f2 frequency, which is a frequency range in which the vibration amount is higher than the reference vibration amount. Because of this, it is possible to operate the vibrator of various frequencies to vary the vibration pattern and to generate a three-dimensional vibration.

In the above, the configuration and operation of the present invention has been shown in accordance with the above description and drawings, but this is merely an example, and various changes and modifications are possible without departing from the spirit and scope of the present invention. .

100: linear vibrator
110: case 111: bracket
112: athletic 113: permanent magnet
114: magnet yoke 114a: lower plate
115: power connection portion 116: magnetic circuit portion
120 damping member 121 mass body
123: spring member 125: coil
126: coil support 127: coil yoke
200: weight adjustment groove 240: bearing
250: support shaft 300: impact transmission member
310: noise reduction member

Claims (11)

A case having a predetermined space therein,
Magnet yoke disposed in the inner space of the case,
Magnetic circuit unit is mounted to the magnet yoke to create a magnetic field of a certain strength,
A coil yoke disposed adjacent to the gap with the permanent magnet,
A coil wound around the coil yoke and generating an electromagnetic field when a power is applied;
A power connection configured to apply power to the coil,
A bracket integrally formed with the power connection unit,
A support shaft installed between the case and the bracket,
A bearing installed to slide along the support shaft,
It includes a movement unit having a mass body integrally mounted with the permanent magnet and reciprocating by the electromagnetic force generated in the coil coupled to the bearing,
A linear vibrator installed on the case or the bracket and including a shock transmitting member configured to transmit the vibration force generated by the collision with the movement unit to the outside during the reciprocating movement of the movement unit;
The method according to claim 1,
The coil yoke has a hole therein and is disposed in a direction perpendicular to the direction of motion of the moving part.
The method according to claim 1,
The permanent magnet is magnetized in a direction perpendicular to the direction of motion of the movement unit linear vibrator
The method according to claim 1,
The coil yoke is supported by a coil yoke support
The method according to claim 1,
The coil yoke has a hole in the inner side and the linear vibrator, characterized in that integrally forming the movement direction of the movement portion and the shape perpendicular to the movement portion
The method according to claim 1,
The shock transmitting member is a linear vibrator, characterized in that the member is fixed to the inner surface of the bracket or the case and has an elastic force
The method according to claim 1,
The shock transmitting member is a linear vibrator, characterized in that using a coil spring or a leaf spring made of metal
The method of claim 8,
The shock transmitting member is a linear vibrator, characterized in that the use of silicone or resin
The method according to claim 1,
A linear vibrator is disposed between the shock transmitting member and the moving part.
10. The method of claim 9,
The noise damping member is a linear vibrator, characterized in that the use of silicone or resin
The method according to claim 1,
The shock transmitting member is a linear vibrator, characterized in that fixed to the case or one side of the bracket by welding, caulking or bonding

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