KR20120012346A - Horizontal Linear vibrator - Google Patents

Abstract

PURPOSE: A horizontal linear vibrator is provided to frequently change a fixed position of a spring, thereby stably securing a resonance frequency band. CONSTITUTION: A linear vibrator(100) includes a vibration absorber(130) and a mass(121) installed inside of a case which is comprised of a permanent magnet(113), a coil part(125), a coil supporter(131), a spring(123), and a power supply connector(115). The mass is installed inside of the central part of the case. The permanent magnet is attached to an empty space inside of the mass. A yoke(114) is attached to one side surface of the permanent magnet in order to maximize electromagnetic efficiency. The coil supporter is attached to a single surface inside of the case. The coil part is arranged in order to generate electromechanical force on one side surface of the coil supporter.

Description

Horizontal Linear Vibrator

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

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.

Vibration motors currently applied to mobile phones generate rotational force to obtain mechanical vibrations using the unbalanced mass rotating parts. Most vibration motors used at this time supply current using a brush and a commutator.

As such, the vibrator mounted in a mobile phone or a game machine is required to have a long life, a small size, and excellent vibration performance.

1 is a cross-sectional view showing a conventional rotary vibrator, Figure 2 is a view showing the FPCB of Figure 1, Figure 3 is a view showing the rotor 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. Referring to FIG. 3, a plurality of commutator patterns 16 are formed on the circuit board 15 such that the power connection 12 may be in electrical sliding contact.

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.

The circuit board 15 is arranged by dividing the commutator 16 into several pieces so that the rotor 14 properly supplies power to the coil 25 while the rotor 14 properly rectifies. In the related art, the moving body 20 is supported and rotated about the shaft 21 to reduce noise with high precision of the bearing 23 and the shaft 21, and the bearing 23 between the shaft 21 and the bearing 23. The oil from the) improves lubrication and reduces noise.

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.

The present invention has been made to solve the above-mentioned problems of the prior art, and provided with a permanent magnet, a coil part and a circuit board in the case, the power between the coil and the permanent magnet when the power is input from the outside through the circuit board In the linear vibrator in which the mass body vibrates horizontally by the electromagnetic force acting, the vibration direction vibrates in the horizontal direction, which is the longitudinal direction of the personal portable terminal or game machine, and has a highly efficient electromagnetic structure, which enables a compact and lightweight structure and a resonance frequency. The purpose is to provide a horizontal vibrator that can be controlled randomly.

In order to achieve this object, a case having a predetermined space therein, a coil disposed in the inner space of the case, a permanent magnet disposed so that the electromagnetic force with the coil, the electromagnetic force of the permanent magnet and the coil In the structure having a mass to move by, a moving portion coupled to the permanent magnet and the mass, a power supply for supplying power to the coil, at least one spring disposed between the moving portion and the inside of the case, a portion of the coil It may include a coil support for fixing the coil to the case.

In addition, the coil support according to the invention may be characterized in that made of a non-magnetic metal or resin or adhesive.

In addition, the coil support according to the invention may be characterized in that the fixing by using welding or caulking or adhesive to the case.

In addition, the permanent magnet according to the present invention can be characterized in that the magnetized in two poles when viewed from the side facing the coil.

In addition, the permanent magnets according to the present invention may be arranged in a planar shape and face each other with a predetermined distance away from both sides with respect to the coil.

In addition, the case having a predetermined space therein according to the present invention,

A coil disposed in the inner space of the case, a permanent magnet disposed to act on electromagnetic force with the coil, a mass moving by the electromagnetic force of the permanent magnet and the coil, a power connection part for supplying power to the coil, In at least one spring structure disposed between the movement portion and the inside of the case, a spring support provided on one side of the spring and having the spring fixing projection; may be characterized in that it comprises a. In addition, the yoke having a groove and a protruding shape on one side of the permanent magnet according to the present invention may be characterized by generating a cogging force.

In addition, it is installed on one side of the spring according to the present invention, it may be characterized in that for fixing the spring using a spring support having a projection shape similar to the shape of the inner or outer diameter of the spring.

In addition, it is possible to adjust the resonant frequency by changing the spring fixed position by using a part of the projection installed on the spring support according to the present invention.

In addition, the power connection portion according to the present invention may be made of a circuit board to be fixed using a groove formed by forging fixing to a part of the case. In addition, the spring according to the invention may be characterized in that it is formed of a conical spring. In addition, the yoke according to the present invention may be characterized by surrounding a part of the permanent magnet surface perpendicular to the surface with respect to the permanent magnet surface facing the coil.

According to the present invention, a horizontal linear vibrator having a permanent magnet, a coil part, and a circuit board inside the case, the mass body vibrating by an electromagnetic force acting between the coil part and the permanent magnet when power is input from the outside through the circuit board. By vibrating in the horizontal direction, which is the length or the width direction rather than the thickness direction of the personal portable terminal, it is possible to sufficiently secure the movement displacement space of the vibration unit, thereby further improving the vibration performance. In addition, the magnet is arranged symmetrically on both sides of the coil to maximize the electromagnetic efficiency, and by changing the fixed position of the spring from time to time has the effect of changing the resonant frequency or secure the resonant frequency band stably.

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.
Figure 4 is an exploded perspective view of a linear vibrator having a coil support according to an embodiment of the present invention.
5 is a plan view and a front view of FIG.
6 is an exploded perspective view of the moving part of FIG. 4 which is an embodiment of the present invention;
Figure 7 is an exploded perspective view of the coil support in accordance with an embodiment of the present invention.
8a to 8c is a spring support and the spring support protrusion structure according to another embodiment of the present invention
9 is a spring support projection fixing method and the frequency characteristic change graph according to another embodiment of the present invention
10 is a coil support structure according to another embodiment of the present invention
11 is a cogging protrusion structure according to another embodiment of the present invention

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

4 is an exploded perspective view of a linear vibrator having a coil support according to an embodiment of the present invention, Figure 5 is a plan view and a front view. 6 is a detailed exploded perspective view of the moving part, Figure 7 is a detailed exploded perspective view of the coil and the coil support.

Referring to the drawings, the linear vibrator 100 having a coil support according to an embodiment of the present invention is a permanent magnet 113, coil portion 125, coil support 131, spring 123, power connection 115 It is configured to include a mass body 121 and the vibration absorbing member 130 provided in the case 110 provided as.

In detail, the case 110 has the lower case 111a and the upper case 111b coupled to each other and have an empty space therein. Case 110 according to an embodiment of the present invention preferably has a hexahedral shape having an upper, a lower surface, a front, a rear side, a left, a right side.

The central portion of the case 110 has a mass body 121 having an empty space therein, and permanent magnets 113 are attached to the empty space inside the mass body, respectively. At this time, when the permanent magnet 113 is attached to the inside of the mass body 121, after attaching the yoke 114 to one side of the permanent magnet 113 to maximize the electromagnetic efficiency, the permanent magnet 113 and the yoke 114 To the mass body 121. The coil support 131 is attached to one inner surface of the case 110. One side of the coil support 131 is attached to the coil 125 for generating an electromagnetic force, and the leading edge connecting portion 115 is attached to the end of the coil 125 so as to easily connect the coil lead wire. In this case, the power connection unit 115 mainly uses a flexible circuit board in consideration of workability and flexibility. The power connection unit 115 is attached along the guide groove 116 formed on one side of the lower case 111a to facilitate the power connection from the outside. The guide groove 116 is mainly formed using a forging process. The spring 123 is disposed between the outside of the mass body 121 and the inside of the case 110. The spring 123 is fixed using the spring support 140 and the spring support protrusion 141, the spring support 140 is fixed to the mass body 121 or the case 110.

The present invention is a magnetic force is generated when the current supplied through the power connection portion 115 from the outside flows to the coil 125, the generated magnetic force pushes and pulls the permanent magnet 113 disposed around the coil 125 To generate a force for the mass body 121 to vibrate. At this time, the vibration force is maximized by the resonance frequency between the spring 123 on one side or both sides of the mass body 121 and the moving part 112 including the spring 123 and the mass body 121.

 There is a damper 120 inside the spring 123. The damper 120 is attached to the mass body 121 to directly collide with the case 110 to generate noise or to prevent mechanical deformation. In particular, the horizontal vibrator 100 has a structure that maximizes the vibration force by using the resonant frequency of the spring 123 and the movement unit 112. When the use frequency bandwidth is determined based on the resonant frequency, the amount of vibration is relatively high in the use frequency band. The damper 120 performs the role of making it constant.

In addition, when the moving part 112 including the mass body 121 performs the horizontal reciprocating motion, the mass body 121 does not move only in the reciprocating direction but also generates a force moving in the direction perpendicular to the reciprocating direction. 112 strikes the case 110 and as a result generates noise. In order to prevent such noise, the vibration absorbing member 130 is disposed between the exercise part 112 and the case 110.

In the present invention, there are various methods of fixing the coil support 131 to the case 110, and welding, caulking, bonding, fixing methods using grooves and protrusions, and the like may be used.

8A, 8B, 8C, and 9 relate to a spring support and a spring support protrusion structure according to another embodiment of the present invention. The resonance frequency is as follows.

Resonance Frequency = Constant * root (k / m) (k is spring constant, m is mass of moving part)

In other words, to change the resonant frequency, the spring constant value or the mass of the moving part must be changed. Particularly, during mass production, the resonance frequency of the product does not come out according to the original design specification according to the distribution of the product and the distribution of parts, and the center frequency is shifted to cause a defect. Therefore, if the resonant frequency can be easily changed at the manufacturing site, it is a very useful technique. Theoretically, to shift the resonant frequency, either change the mass or the spring constant. The present invention is designed to change the resonant frequency by devising to change the spring fixed position little by little. 8A and 8B illustrate an embodiment of the spring support 140 having a spring support protrusion 141 formed to be symmetrical to the shape of the spring 123. The spring 123 used in the present invention has a circular shape as a coil spring, and thus the spring support protrusion 141 is also formed in a circular shape. 8C illustrates an embodiment in which the spring 123 is formed in a conical shape and the spring support protrusion 141 is fixed based on the inner side of the spring 123. In the case of FIG. 8A, a plurality of spring support protrusions 141 are formed and the spring 123 supporting protrusions 141 are fixed to the springs or only a part of the spring support protrusions 141 to adjust the resonance frequency. It is designed to be easy to fix. The spring constant value changes little by little depending on the position of the spring 123 fixing part. In addition, as the spring 123 fixed portion increases, the spring movable length decreases, the spring constant increases, and the resonance frequency increases.

9 relates to a method for fixing the spring support protrusion 141 and a frequency characteristic change graph according to another embodiment of the present invention. As shown in FIG. 9A, a spring support protrusion 141 is formed on the spring support 140, and FIG. 9B shows an example of processing the spring 123 to the spring support protrusion 141. A method of fixing a part of the spring 123 by deforming the protrusion of the spring support protrusion 141. Caulking or press methods can be used. 9C illustrates a method of fixing a part of the spring 123 without deforming the protrusion of the spring support protrusion 141. Bonding, welding, or the like can be used.

FIG. 9D shows graph characteristics in which the resonant frequency changes according to the position and range of the fixing part of the spring 123. As the length of the movable part of the spring 123 is shortened, the spring constant increases and the resonance frequency increases.

10A, 10B, and 10C illustrate embodiments of the coil support 131 and the coil 125.

10A illustrates an example in which the coil support 131 is configured to have a 'c' shaped structure to attach the coil 125, and FIG. 10b illustrates that the coil support 131 is configured to have a 'c' shaped structure, but In order to prevent the mechanical air gap from being reduced by the thickness, the coil 125 is attached to the empty space after burring or drawing the coil 125 attachment portion. FIG. 10C illustrates a method in which a bond or a resin is used as the coil support 131 without using a separate metallic coil support 131 to be integrally formed with the coil 125.

11A and 11B relate to an embodiment of the permanent magnet 113 and the yoke 114. As shown in FIG. 11B, the yoke 114 surrounds a part of the surface of the permanent magnet 113 perpendicular to the surface based on the surface of the permanent magnet 113 facing the coil 125. That is, the yoke 114 surrounds a part of the side of the permanent magnet 113 to minimize the leakage magnetic flux generated from the permanent magnet 113 and to suppress the occurrence of the leakage magnetic flux in the direction perpendicular to the movement direction of the movement part 112. It works. If the leakage magnetic flux leaks a lot outside, it has a bad effect such as noise on the antenna of the mobile phone.

Looking at the lower yoke 114 of Figure 11b it can be seen that the cogging projection 135 is formed. Most of the magnetic flux generated at the north pole of the permanent magnet 113 flows to the south pole along the yoke 114. However, some magnetic flux flows through the cogging protrusion 135 to the case 110. That is, a magnetic force is generated between the cogging protrusion 135 and the case 110 to generate a force that moves the movement part 112 in the direction of the cogging protrusion 135, and this force presses the vibration absorbing member 130 to generate friction. . This frictional force shortens the falling time of the horizontal vibrator 100, eliminates residual vibration, and improves response. Cogging force can be adjusted according to the size of the cogging protrusion 135, the gap, the yoke 114 material, thickness, shape.

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 111a: lower case
111b: upper case 112: athletic part
113: permanent magnet 114: York
115: power connection 116: guide groove
120: damper 121: mass
121a, 121b: mass 123a, 123b: spring
125 coil 130 vibration absorbing member
131: coil support 135: cogging protrusion
140: spring support 141: spring support projection

Claims (12)

A case having a predetermined space therein,
A coil disposed in the inner space of the case,
Permanent magnets arranged to act on the coil and electromagnetic force,
Mass body moving by the electromagnetic force of the permanent magnet and the coil,
A movement unit in which the permanent magnet and the mass are combined;
A power connection unit for supplying power to the coil,
In the spring structure disposed at least one between the moving part and the inside of the case,
And a coil support provided on a part of the coil to fix the coil to the case.
The method of claim 1,
The coil support is a horizontal linear vibrator, characterized in that made of non-magnetic metal or resin or adhesive
The method of claim 1,
The coil support is a horizontal linear vibrator, characterized in that for fixing to the case using welding or caulking or adhesive
The method of claim 1,
The permanent magnet is magnetized in two poles when viewed from the side facing the coil.
The method of claim 1,
The permanent magnet is composed of a plurality in a planar shape, the horizontal linear vibrator, characterized in that disposed facing each other at a predetermined distance from both sides around the coil
A case having a predetermined space therein,
A coil disposed in the inner space of the case,
Permanent magnets arranged to act on the coil and electromagnetic force,
Mass body moving by the electromagnetic force of the permanent magnet and the coil,
A power connection unit for supplying power to the coil,
In the spring structure disposed at least one between the moving part and the inside of the case,
And a spring support provided on one side of the spring and having the spring fixing protrusion.
The method according to claim 1 or 6,
Horizontal linear vibrator, characterized in that for generating a cogging force by placing a yoke having a groove and a projecting shape on one side of the permanent magnet
The method of claim 6,
Horizontal linear vibrator is installed on one side of the spring, the spring is fixed by using a spring support having a projection shape similar to the shape of the inner or outer diameter of the spring
The method of claim 6,
Horizontal linear vibrator, characterized in that for adjusting the resonant frequency by changing the spring fixed position using a portion of the projection installed on the spring support
The method according to claim 1 or 6,
The power connection portion is made of a circuit board horizontal horizontal vibrator, characterized in that for fixing using a groove formed by forging fixed to a part of the case
The method according to claim 1 or 6,
Horizontal spring vibrator, characterized in that the spring is formed of a conical spring
The method according to claim 1 or 6,
And the yoke surrounds a portion of the permanent magnet surface perpendicular to the surface with respect to the permanent magnet surface facing the coil.

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