WO2012018171A1

WO2012018171A1 - Linear vibration motor

Info

Publication number: WO2012018171A1
Application number: PCT/KR2011/002612
Authority: WO
Inventors: 송청담
Original assignee: 주식회사 비에스이; 톈진 비에스이 일렉트로닉스 컴퍼니 리미티드; 동관 바오싱 일렉트로닉스 컴퍼니 리미티드; 롱쳉 바오싱 일렉트로닉 컴퍼니 리미티드
Priority date: 2010-08-06
Filing date: 2011-04-13
Publication date: 2012-02-09
Also published as: CN202121479U; CN102377314A; KR101130064B1; KR20120013718A; TW201214931A

Abstract

The present invention pertains to a linear vibration motor which vibrates by the vertical movement of a vibrator. The disclosed invention includes: a case in the shape of a box that is opened at one surface portion; a vibrator received in the case and vibrates therein; a spacer formed in a shape of a cylinder that is opened at both side portions, which is mounted in the case and receives the vibrator inside; a cover coupled through curling with an opened end of the case in a state that the cover is mounted to the spacer; a cubic suspension to be protruded in the center portion thereof, having an edge portion inserted and supported between the spacer and the cover, and the center portion coupled with the vibrator so as to elastically support the vibrator; and a substrate positioned on the bottom surface of the cover and stacked with a voice coil which interacts with the vibrator. According to the linear vibration of the present invention as above, the vibrator includes a magnet and a mass body that vertically moves by the elastic force of the suspension, thereby generating vibration. Therefore, a reaction rate by an instant input of a signal that is inputted from the outside is fast, decreases the power consumption by DC driving, and differs from prior art in that the lifespan of speaker increases as friction is not generated.

Description

Linear vibration motor

The present invention relates to a vibration motor, and more particularly to a linear vibration motor vibrating by the vertical movement of the vibrator.

In general, one of the essential functions of a communication device is an incoming call function. Commonly used types such as melody, voice function such as melody and bell and vibration function to shake the device.

The double vibration function is used to prevent the melody or bell from being transmitted to the outside through the speaker to damage others. For this vibration, it is common to drive the small vibration motor so that the driving force is transmitted to the case of the device so that the device can vibrate.

Vibration motors currently applied to mobile phones are classified into a coin type having a thin thickness and a bar type having a long shape according to its shape. In the case of the coin and bar type vibration motor, the vibration is generated by the rotational force due to the weight asymmetrical structure, so the reaction speed by the instantaneous input is slow, the current consumption by the DC driving is high, and the commutator for supplying the current is There is a problem that the life is shortened by the friction of the commutation brush.

An object of the present invention is to solve the above problems, to provide a linear vibration motor that can increase the reaction speed by the instantaneous input, lower the current consumption by the DC drive, and extend the life.

In order to achieve the above object, the present invention is a cylindrical case with one surface opened; A vibrator accommodated in the case and vibrating; A spacer having both sides opened and mounted in the case and receiving the vibrator therein; A cover coupled to the opened end of the case by curing while seated on the spacer; A three-dimensional shape in which a central portion protrudes, an edge of which is inserted and supported between the spacer and the cover, and a central portion of which is coupled to the vibrator, the suspension for elastically supporting the vibrator; And a substrate mounted on the bottom of the cover and mounted with the voice coil interacting with the vibrator.

The suspension may include a circular ring-shaped outer plate portion inserted between the spacer and the cover; An inner plate portion formed to have a height difference from the outer plate portion and having a diameter smaller than that of the outer plate portion and coupled to the vibrator; And a connecting plate portion connecting the outer plate portion and the inner plate portion.

A groove is formed in the open end of the case being cured, and the substrate is exposed to the outside through the groove.

According to such a linear vibration motor according to the present invention has the following effects.

First, since the vibrator including the magnet and the mass moves up and down by the elastic force of the suspension, the vibration is generated, the reaction speed by the instantaneous input of the signal input from the outside is fast, and the current consumption by the DC drive is reduced, Unlike the conventional art, since there is no friction, the life of the vibration motor is extended.

Second, by stacking the parts in the case and by fixing the end of the case by curling, there is an advantage that it is easy to manufacture because the welding is not necessary, and the cost of the product can be lowered by simplifying the parts.

Third, while the components inside are tightly joined by the pressure at the time of curing, they are finished in a beautiful state so that the end of the substrate is not exposed, and even if they collide with other components, they do not generate scratches and do not require spot welding, resulting in improved productivity. It is low and the cost of initial facility investment can be reduced.

Fourth, the spacer is mounted in the case, the suspension and the cover are seated on the open upper surface of the spacer in turn, and the assembly is completed by currying the open end of the case, thereby simplifying the assembly process and allowing the vibrator to stably vibrate. Can be.

1 is an exploded perspective view of a linear vibration motor according to an embodiment of the present invention.

2 is a combined perspective view of a linear vibration motor according to an embodiment of the present invention.

Figure 3 is a cutaway perspective view of a linear vibration motor according to an embodiment of the present invention.

Figure 4 is a side cross-sectional view of a linear vibration motor according to an embodiment of the present invention.

10 case 20 oscillator

21: Magnet 22: York

23: plate 24: mass

25: void 30: spacer

40: cover 50: suspension

51: outer plate portion 52: inner plate portion

53: connecting plate portion 54: through hole

60 substrate 61 exposed part

70: voice coil

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

The linear vibration motor according to the exemplary embodiment of the present invention includes a case 10, a vibrator 20, a spacer 30, a cover 40, a suspension 50, and a substrate 60.

The case 10 is formed in a cylindrical shape with one surface open, and a groove 10a is formed at one side of the open end portion.

When the external signal is applied to the voice coil 70 mounted on the substrate 60, the vibrator 20 resonates up and down by interaction with an electromagnetic force generated by the voice coil 70. This vibrator 20 includes a magnet 21, a yoke 22, a plate 23, and a mass 24.

The spacer 30 is mounted in the case 10 as a cylindrical having both sides opened, and the vibrator 20 is accommodated therein. As the material of the spacer 30, a metal, a plastic, a polymer, or the like may be used.

The cover 40 closes an open surface of the case 10 to prevent damage to internal components.

The suspension 50 is a three-dimensional shape in which the central portion protrudes downward, is formed so as to have a height difference with the outer plate portion 51, the outer plate portion 51 of the circular ring shape, the diameter of the circular ring shape smaller than the outer plate portion 51 It includes an inner plate portion 52, a connecting plate portion 53 for connecting the outer plate portion 51 and the inner plate portion 52. The connecting plate portion 53 is formed in a curved shape and provided with two or more so as to elastically connect the outer plate portion 51 and the inner plate portion 52 in a constant shape and interval with the through hole 54 therebetween.

The substrate 60 is adhered to the bottom of the cover 40, and the voice coil 70 is mounted on the bottom of the cover 40. One side of the substrate 60 is formed with an exposed portion 61 exposed to the outside of the cover 40. A flexible printed circuit board (FPCB) is used as the substrate 60, and a pattern of a predetermined shape is formed on the substrate 60.

Figure 2 is a combined perspective view of a linear vibration motor according to an embodiment of the present invention, Figure 3 is a cutaway perspective view of a linear vibration motor according to an embodiment of the present invention, Figure 4 is a linear according to an embodiment of the present invention A side cross-sectional view of a vibration motor.

The open end of the case 10 fixes the suspension 50 and the cover 40 by curing in a state in which the suspension 50 and the cover 40 are sequentially seated on the opened surface of the spacer 30. At this time, the exposed portion 61 of the substrate 60 is exposed to the outside through the groove 10a formed at the open end of the case 10 to receive a signal from the outside.

The magnet 21 constituting the vibrator 20 has a magnetic force, the yoke 22 surrounds the magnet 21 and is coupled with the bottom of the magnet 21, and the plate 23 is an upper surface of the magnet 21. The mass 24 is attached to the outer side of the yoke 22 and has a mass of a predetermined size. Here, the gap 25 into which the voice coil 70 is inserted is formed between the side of the magnet 21 and the plate 23 and the inner surface of the yoke 22. On the other hand, the plate 23 concentrates the magnetic field generated from the magnet 21 in a specific direction.

The cover 40 is fixed to the open end of the case 10 by curing while seated on the outer plate portion 51 of the suspension 50 on the spacer 30, so that the internal parts are not exposed to the outside. It is finished beautifully. Therefore, the internal parts can be prevented from being broken even when they collide with other parts, and the internal parts are tightly coupled by the pressure at the time of currying.

The outer plate portion 51 constituting the suspension 50 is supported while being inserted between the spacer 30 and the cover 40, and the inner plate portion 52 is joined to the upper surface of the yoke 22 of the vibrator 20. As a result, the vibrator 20 is elastically supported. On the other hand, the upper, lower or upper, lower sides of the periphery of the suspension 50 may be provided with a vibration auxiliary member (not shown) of a plastic, metal or polymer series to reinforce or cancel the vibration characteristics of the vibrator 20. .

The exposed portion 61 of the substrate 60 is exposed to the outside through the groove 10a formed at the open end of the case 10 to receive a signal from the outside, the signal received from the exposed portion 61 The pattern is transferred to the voice coil 70 through the pattern of the substrate 60.

The voice coil 70 is formed in a cylindrical tube shape and is connected to a pattern of the substrate 60 to receive an external signal through the substrate 60. The voice coil 70 is located in the air gap 25 formed between the magnet 21 and the plate 23 and the yoke 22 during assembly.

Hereinafter, the assembly process and the operation of the linear vibration motor according to the embodiment of the present invention configured as described above will be described.

The assembly process of the linear vibration motor according to the present invention will be described.

First, the magnet 21 and the plate 23 are mounted in the yoke 22 of the vibrator 20, the mass body 24 is coupled to the outside of the yoke 22, and then the mass body on the inner plate portion 52 of the suspension 50. Attach (24). After the case 10 is aligned, the spacer 30 is placed in the case 10, and the vibrator 20 and the inner plate part 52 of the suspension 50 are inserted into the spacer 30. At this time, the outer plate portion 51 of the suspension 50 is seated on the open upper end of the spacer (30).

Subsequently, the substrate 60 on which the voice coil 70 is mounted is bonded to the bottom surface of the cover 40, and finally, the cover 40 is placed thereon and assembled by curing the open end of the case 10 inward. This is done. When the open end of the case 10 is cured, the outer plate portion 51 and the cover 40 of the suspension 50 are in close contact with the spacer 30.

Through the above process will be described the operation of the linear vibration motor of the present invention the assembly is completed.

In the magnet 21, a magnetic field having a constant intensity and direction is generated. In addition, the plate 23 concentrates the magnetic field generated in the magnet 21 in a specific direction.

The signal input from the outside, that is, from the main board of the portable terminal through the exposed portion 61 of the substrate 60 is transmitted to the voice coil 70 through a pattern. When a signal is transmitted from the outside to the voice coil 70, the variable voice field having a direction and intensity is generated in the voice coil 70 according to the signal.

On the other hand, the vibrator 20 has an inherent frequency, and when it matches the frequency according to the signal input from the outside as described above will vibrate. At this time, the voice coil 70 maintains a stopped state.

At this time, when the electric field generated in the voice coil 70 has the same pole as the magnetic field generated in the magnet 21, the vibrator 20 is lowered in the drawing due to the repulsive force, in the case of having different poles It rises by drawing.

Through this process, the vibrator 20 resonates up and down, and the vibration caused by the movement is transmitted to the case 10 and the cover 40 through the suspension 50 to vibrate the entire vibration motor, and finally Causes the communication device to vibrate.

According to the linear vibration motor according to the present invention having the configuration and action as described above, so that the vibrator 20 including the magnet 21 and the mass body 24 moves up and down by the elastic force of the suspension 50 to generate vibration. By doing so, the reaction speed by the instantaneous input of the signal input from the outside is fast, the current consumption by the DC drive is reduced, and unlike the conventional, the life of the vibration motor is extended because there is no friction.

In addition, by stacking the parts in the case 10 and by curing the end of the case 10, it is not necessary to weld, it is easy to manufacture and can simplify the parts to lower the cost of the product. In addition, even when the components inside are tightly coupled by the pressure during currying, the ends of the substrate 60 are finished in a beautiful state so that they do not cause scratches even when collided with other components, and spot welding is not required, thereby improving productivity. In addition, the defect rate is low, and the cost of initial facility investment can be reduced.

Meanwhile, the spacer 30 is mounted in the case 10, the suspension 50 and the cover 40 are sequentially seated on the open upper surface of the spacer 30, and then the open end of the case 10 is cured. By assembling is completed, the assembly process is simplified and the vibrator 20 can be stably vibrated.

As described above, the present invention has been described based on the preferred embodiments, but the present invention is not limited to the specific embodiments, and those skilled in the art may change the scope within the scope of the claims. .

Claims

A cylindrical case with one side open;

A vibrator accommodated in the case and vibrating;

A spacer having both sides opened and mounted in the case and receiving the vibrator therein;

A cover coupled to the opened end of the case by curing while seated on the spacer;

A three-dimensional shape in which a central portion protrudes, an edge of which is inserted and supported between the spacer and the cover, and a central portion of which is coupled to the vibrator, the suspension for elastically supporting the vibrator; And

And a substrate mounted on the bottom of the cover and mounted with a voice coil interacting with the vibrator.
The method of claim 1,

The suspension is,

An outer plate portion having a circular ring shape inserted between the spacer and the cover;

An inner plate portion formed to have a height difference from the outer plate portion and having a diameter smaller than that of the outer plate portion and coupled to the vibrator; And

Linear vibration motor comprising a connecting plate portion for connecting the outer plate portion and the inner plate portion.
The method according to claim 1 or 2,

A groove is formed at the open end of the case being cured, and the substrate is exposed to the outside through the groove.