WO2011010778A1

WO2011010778A1 - Linear vibration motor

Info

Publication number: WO2011010778A1
Application number: PCT/KR2010/000507
Authority: WO
Inventors: 김태진
Original assignee: Kim Tae Jin
Priority date: 2009-07-21
Filing date: 2010-01-28
Publication date: 2011-01-27
Also published as: KR100923867B1

Abstract

The present invention relates to a linear vibration motor capable of vibrating electronic equipment. The linear vibration motor comprises: a casing that has a hollow interior and is open on one side; a bracket that is configured to close the open side of the casing and has an extension piece at the edge of one side thereof, the extension piece being projected outward of the casing; a magnet that is attached to the inner top surface of the casing and generates a magnetic field of a given direction and intensity; and a vibrator that is mounted inside the casing in such a manner as to face the magnet, the vibrator generating a magnetic field of a varying intensity and direction according to a specific frequency electrical signal transmitted from outside and then interacting with the magnetic field generated from the magnet to vibrate in a longitudinal direction of the casing. Also, the vibrator includes a connection piece that is inserted into the casing while facing the extension piece at one side thereof and can receive a specific frequency electric signal transmitted from outside; a moving piece that has an edge on one side connected to the connection piece to be able to receive the specific frequency electric signal transmitted from the connection piece and is movable in a longitudinal direction of the casing while being fixed to the connection piece; a coil that is mounted to one side of the moving piece on the opposite side of the magnet, the coil generating a magnetic field of a varying intensity and direction upon receiving an external electric signal transmitted to the moving piece via the connection piece and then interacting with the magnetic field of the magnet to move, together with the moving piece, in the longitudinal direction of the casing; and a weight that is mounted to an outer circumferential surface of the coil, thereby moving, together with the moving piece, in the longitudinal direction of the casing to maximize strength of the vibration. Further, a ring yoke is installed between the coil and the weight to uniformly deploy the magnetic field generated from the magnet and coil in a particular region such that the vibrating coil may not lean towards one direction inside the casing. Moreover, the vibrator has an elastic member interposed between the connection piece and the weight, both sides of the elastic member being coupled to one side of the bracket and one side of the weight, respectively, and a through hole is formed at the center of the elastic member to enable the moving piece to pass therethrough, thereby effectively transmitting the vibration that is generated from the weight coupled to the coil outside. The linear vibration motor having the above configuration according to the present invention can thus vibrate electronic equipment by employing a coil that generates a magnetic field of a varying intensity and direction according to a specific frequency electric signal transmitted from outside, a magnet that generates a magnetic field of a given intensity and direction all the time, and a weight and elastic member that can maximize the vibration of the coil moving vertically with respect to the magnet. Therefore, the linear vibration motor according to the present invention is advantageous in that the life of the vibration motor can be preserved semi-permanently by not using a brush and a rectifier that are applied to existing vibration motors.

Description

Linear vibration motor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear vibration motor, and more particularly, to a coil capable of generating a magnetic field whose intensity and direction vary according to an electric signal of a specific frequency input from the outside, and to generating a magnetic field having a fixed intensity and direction at all times. The present invention relates to a linear vibrating motor capable of facing a magnet to obtain a vibration force and then transmitting the vibration force to an electronic device or the like.

In general, a communication device is equipped with a voice device such as a melody or a bell, or a vibration device for shaking the device so that the owner of the communication device knows the reception state of the information.

The vibration device has been proposed to reduce the noise damage caused by the voiced device. The vibration device may be a small vibration motor that can be inserted into a mobile phone.

As shown in FIG. 6, a vibration motor that is currently applied to a mobile phone includes a coin type vibration motor having a thin thickness. The coin type vibration motor is typically a fixed member. It consists of the stator 101 and the rotor 102 which is a rotating member.

In addition, the stator 101 provided in the coin-type vibration motor has a bracket 104 having a shaft 103 protruding in a cylindrical shape while being formed in a circular flat plate shape, and on the shaft 103. While seated on the top surface of the bracket 104 in a penetrating state, the lower substrate 106 having a brush 105 that can transmit electrical signals transmitted from the outside to other devices, and penetrates the shaft 103 It consists of a permanent magnet 107 in the form of a circular ring seated on the upper surface of the lower substrate 106 in a closed state.

In addition, the rotor 102 may include a bearing 108 that can penetrate the shaft 103,

coil assemblies

109a and 109b mounted outwardly of the bearing 108, and a weight body 110. Equipped.

In addition, the bottom of the rotor 102 is provided with a commutator 111 in contact with the brush 105 to receive an external electrical signal transmitted from the brush 105, the bracket 104 is provided The rotor 102, a cover 112 that can cover the permanent magnet 107 and the lower substrate 106 is mounted.

The coin-type vibration motor having the structure as described above may obtain mechanical vibration by rotating the rotor 102 having the weight body 110 biased to one side, wherein most of the rotational force is a brush ( The current is supplied to the

coil assemblies

109a and 109b of the rotor 102 via the 105 and the commutator 111.

However, the vibrating motor using the brush 105 and the commutator 111 has a disadvantage in that the brush 105 and the commutator 111 have mechanical friction when the motor rotates, so that the brush 105 and the commutator ( 111, there is a problem that the life of the motor is shortened due to mechanical wear.

On the other hand, in order to solve this problem, there is an invention such as "linear vibration device" of the patent application No. 10-0898017 to which the inventor has applied for a patent, the linear vibration device is a flat plate shape, as shown in FIG. A permanent magnet that is coupled to the bracket 200, the cover 200 and the inside of which is empty at the same time, and is mounted on the inner upper surface of the cover 202 to generate a magnetic field having a fixed size and direction. 204 is provided.

In addition, one side of the bracket 200 disposed inside the cover 202, the lower PCB 206 is mounted to receive an electrical signal of a specific frequency transmitted from the outside.

In addition, one side of the lower PCB 206 disposed inside the cover 202 may exhibit elasticity of a predetermined size, and may be elastically capable of receiving an electrical signal of a specific frequency transmitted from the lower PCB 206. Member 208 is mounted.

In addition, one side of the elastic member 208 disposed inside the cover 202 generates a magnetic field whose size and direction change in accordance with an electrical signal of a specific frequency transmitted from the elastic member 208, and then a permanent magnet A vibrating body 210 is mounted to interact with the magnetic field generated from the 204 to vibrate in the longitudinal direction of the permanent magnet 204 together with the elastic member 208.

In addition, the vibrating body 210 is bonded to one side of the elastic member 208, the upper PCB 212 receives the electrical signal of a specific frequency transmitted from the elastic member 208 and the upper PCB 212 Coil 214 bonded to one side of the coil and mounted to face the permanent magnet 204 to receive an electric signal of a specific frequency transmitted from the upper PCB 212 to generate a magnetic field of a variable size and direction, and It is composed of a weight 216 mounted on the outer circumferential surface of the coil 214 and one side of the upper PCB 212.

However, the linear vibration device according to the present invention having such a structure has a problem in that the upper PCB 212 and the lower PCB 206 face each other on both sides of the elastic member 208, thereby increasing the thickness of the linear vibration device. .

Accordingly, the present invention is to solve the structural problems according to the conventional vibration motor as described above, by removing the brush and commutator to reduce the mechanical wear of the vibration motor, the purpose of semi-permanently preserving the life of the vibration motor.

Another object of the present invention is to provide a linear vibration motor that can be inserted into a smaller device by making the thickness thinner than conventional vibration motors.

The linear vibration motor of the present invention for achieving the above object is a case in which one side is opened and the inside is empty, and one side of the open case can be closed while protruding in one direction to the outside of the case. A bracket having an extension piece, a magnet attached to the inner upper surface of the case to generate a magnetic field having a fixed direction and intensity, and mounted inside the case to face the magnet to transmit electrical signals of a specific frequency transmitted from the outside; According to the present invention, a magnetic field having a variable strength and direction is generated, and then a vibrating body capable of vibrating in the longitudinal direction of the case by interacting with a magnetic field generated from the magnet.

In addition, the vibrating body is inserted into the case with one side facing the expansion piece, the connecting piece which can receive an electrical signal of a specific frequency transmitted from the outside, and one edge is connected to the connecting piece from the connecting piece Receives the electric signal of a specific frequency to be transmitted and fixed to the connecting piece in the state of moving in the longitudinal direction of the case, mounted on one side of the moving piece facing the magnet and transmitted to the moving piece via the connecting piece A magnetic field having a variable intensity and direction by receiving an external electric signal, and then interacting with a magnetic field of a magnet to move in the longitudinal direction of the case together with the moving piece, and a coil mounted on an outer circumferential surface of the coil With the case in the longitudinal direction to maximize the strength of vibration Which comprises a weight.

In addition, a ring yoke is mounted between the coil and the weight to allow the magnetic field generated from the magnet and the coil to be evenly distributed within a specific section so that the vibrating coil is not biased in one direction from the inside of the case.

In addition, the vibrating body is interposed between the connecting piece and the weight, both sides are coupled to one side of the bracket and one side of the weight and the elastic member having a through hole through which the moving piece can be passed in the center is coupled to the coil The vibration generated from the weight can be effectively transmitted to the outside.

The linear vibration motor according to the present invention having such a structure includes a coil for generating a magnetic field whose intensity and direction are variable according to an electric signal of a specific frequency input from the outside, and a magnet for generating a magnetic field having a fixed intensity and direction at all times; And a weight and an elastic member capable of maximizing the vibration of the coil moving in the vertical direction with respect to the magnet.

Therefore, the linear vibration motor according to the present invention has an advantage of semi-permanently preserving the life of the vibration motor by not using a brush and a commutator applied to the existing vibration motor.

The linear vibration motor according to the present invention does not use a brush and a commutator, thereby reducing the mechanical wear of the vibration motor, by ensuring a sufficient space for the weight having a predetermined mass can be vibrated, the maximum vibration under the same volume The amount of vibration can be generated and the vibration amount can be controlled according to the frequency by using the resonance frequency.

In addition, since the signal transmission member and the weight to which the coil is coupled cannot deform the elastic member unless an electric signal of a specific frequency is input to the coil, the gap between the bottom of the weight and the bracket coupled to the coil before the cover is coupled. Can be adjusted to ensure that all products are of equal quality.

In addition, since the vibrating body combined with the bracket only needs to be inserted into the inner side of the case in which the magnet is mounted, it is easy to assemble and has an advantage of troubleshooting and characteristic inspection.

In addition, the coil provided in the present invention can be magnetically '0' when the electrical signal of a specific frequency disappears, so that a fast response speed and characteristic design are possible.

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

Figure 2 is a view showing the appearance of the plate equipped in the present invention,

3 and 4 are a perspective view of the connection piece and the coupling guide and the moving piece mounted with a coil,

5 is a longitudinal sectional view of a linear vibration motor according to the present invention;

6 is an exploded view of a conventional coin type vibration motor,

7 is an exploded view of a conventional linear vibration device.

* Description of symbols on the main parts of the drawings *

1. Case 3. Extension

5. Bracket 7. Magnet

9. Vibrating body 11. Connecting piece

13. Moving piece 15. Coil

17.Weight 19.Ring York

21. Elastic member 23. Plate

25. Shock absorber 27. Connection guide

29. Outer plate 31. Through hole

33. Inner plate 35. Connecting bridge

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

1 is an exploded perspective view of a linear vibration motor according to the present invention, Figure 2 is a view showing the appearance of the plate equipped in the present invention, Figure 3 and Figure 4 is a perspective view of the connection piece and the coupling guide and the moving piece is mounted coil to be.

5 is a longitudinal sectional view of the linear vibration motor according to the present invention.

As shown in these figures, the linear vibrating motor according to the present invention has a case 1 at which one side is open and the inside is empty, and one side of the open case 1 can be closed. A bracket (5) having an extension piece (3) projecting in an outward direction of (1), a magnet (7) attached to the inner top surface of the case (1) to generate a magnetic field having a fixed direction and strength, and It is mounted inside the case 1 to face the magnet 7 to generate a magnetic field of varying intensity and direction according to an electrical signal of a specific frequency transmitted from the outside, and then interacts with the magnetic field generated from the magnet 7. It consists of a vibrating body (9) capable of vibrating in the longitudinal direction of the case (1).

In addition, the vibrating body 9 is inserted into the case 1 in a state where one side thereof faces the expansion piece 3, and the connecting piece 11 capable of receiving an electrical signal of a specific frequency transmitted from the outside. And, one side edge is connected to the connecting piece 11 can receive an electrical signal of a specific frequency transmitted from the connecting piece 11 and be moved in the longitudinal direction of the case 1 in a state fixed to the connecting piece (11) It is mounted on one side of the movable piece 13, the magnet 7 and the movable piece 13 facing the movable piece 13 and receives the external electric signal transmitted to the moving piece 13 via the connecting piece 11, and the strength and direction This variable magnetic field is generated and then interacts with the magnetic field of the magnet 7 to move together with the moving piece 13 in the longitudinal direction of the case 1, and the coil 15 of the coil 15. Mounted on the outer circumferential surface of the case 1 together with the coil 15 It is provided with a weight 17 that can be moved in the longitudinal direction to maximize the intensity of vibration.

On the other hand, the coil 15 is preferably formed in a cylindrical shape with a line and the rear end is opened, the hollow inside, the magnet 7 is the outer diameter of the coil 15 so that it can be inserted into the inside of the coil 15 It is preferable that the cylindrical shape is made smaller than the inner diameter of.

In addition, between the coil 15 and the weight 17, the magnetic field generated from the magnet 7 and the coil 15 can be evenly enclosed in a specific section so that the vibrating coil 15 is the case (1). The ring yoke 19 is mounted so as not to be biased in one direction from the inside.

In addition, the vibration body 9 is interposed between the connecting piece 11 and the weight 17, both sides are coupled to one side of the bracket 5 and one side of the weight 17, the moving piece 13 in the center An elastic member 21 having a through hole 31 through which the passage can be mounted may be mounted to effectively transmit the vibration generated from the weight 17 coupled to the coil 15 to the outside.

In addition, it is preferable that the plate 23 is mounted on one side of the magnet 7 facing the moving piece 13 so as to concentrate the magnetic field generated from the magnet 7 in a specific direction.

In addition, the peripheral surface of the magnet 7 and the plate 23 reduces contact noise between the combination of the magnet 7 and the plate 23 and the coil 15, and also the magnet 7 and the plate 23. Magnetic fluid is preferably applied to reduce wear of the coil 15 and the magnet 7 and the plate 23 due to frequent contact between the assembly and the coil 15, and the bracket 5 and Between the moving piece 13, the buffer plate 25 is preferably mounted to reduce the contact noise generated between the moving piece 13 and the bracket (5).

In addition, the outer shape of the plate 23 attached to one side of the magnet 7 is as shown in Figure 2 to facilitate the application of magnetic fluid to the magnet 7 and the peripheral surface of the plate 23, the magnet ( It is preferable that the circular shape 23a is 5% to 10% smaller than the outer diameter of 7), or is made of an elliptical shape 23b or a cross shape 23c.

Meanwhile, between the connecting piece 11 and the moving piece 13, as shown in FIGS. 3 and 4, the edge of the moving piece 13 from one end of the connecting piece 11 inserted into the case 1. While pivoting in the circumferential direction of the movable piece 13 with a predetermined gap therebetween, the connecting piece 27 is mounted so that the end thereof can be connected to the edge of the movable piece 13 so that the connecting piece 11 is an elastic member ( The movable piece 13 connected to the connecting piece 11 moves in the up and down direction of the case 1 through the through hole 31 of the elastic member 21 in a state in which it cannot be moved between the bracket 21 and the bracket 5. To be possible.

In addition, the connecting piece 11, the moving piece 13 and the connection guide 27 are provided with a positive pole printed circuit and a negative pole printed circuit so as to receive an electrical signal of a specific frequency input from the outside.

The weight 17 combined with the coil 15 or ring yoke 19 typically has a heavier mass than iron, which is the coil 15 in a narrow space formed by the case 1 and the bracket 5. In order to maximize the vibration strength of the weight 17 by the coil 15, by increasing the mass of the weight 17 that can be vibrated by).

As shown in FIG. 1, the elastic member 21 has an annular ring-shaped outer plate 29 which can be fixed to one side of the bracket 5 with the connecting piece 11 interposed therebetween, and the outer plate ( The inner plate 33 having a through hole 31 smaller than the inner diameter of the outer plate 29 while being spaced a predetermined distance in the height direction of the outer plate 29, one side may be coupled to one side of the weight 17. It includes.

In addition, while turning between the outer plate 29 and the inner plate 33 in the circumferential direction of the outer plate 29 or inner plate 33, both ends of the outer plate 29 and the inner plate 33. A connection bridge 35 that can be connected to is mounted to allow the inner plate 33 to contract or expand relative to the outer plate 29.

On the other hand, the magnetic fluid described above is to stabilize and disperse the magnetic powder in the colloidal shape in the liquid, and then to add a surfactant to prevent the precipitation or aggregation of the magnetic powder by gravity or magnetic field, such as triiron tetraoxide, iron Cobalt alloys, fine particles dispersed in oil or water, or cobalt dispersed in toluene.

The magnetic powder is ultrafine particles of 0.01 ~ 0.02 μm, and performs the brown movement peculiar to the ultrafine particles, and the concentration of the magnetic powder particles in the fluid can be maintained even if external magnetic fields, gravity, centrifugal force, etc. are applied.

Referring to Figure 5 the process of operating the linear vibration motor according to the present invention having the structure as described above is as follows.

First, when an electrical signal having a specific frequency is input to the connecting piece 11 provided in the present invention, the coil 15 is connected to the connecting piece 11 and the moving guide 13 and the moving piece 13 of a specific frequency. Receive an electrical signal.

Meanwhile, the coil 15 receiving the electric signal of the specific frequency generates a magnetic field whose intensity and direction vary according to the electric signal of the specific frequency, and then interacts with the magnetic field generated from the magnet 7 to move the moving piece. Together with the weight 13 and the ring yoke 19, the case 1 vibrates in the up and down directions.

At this time, the elastic member 21 may be transmitted to the outside by maximizing the vibration transmitted from the weight 17 and the ring yoke 19, the coil 15 and the moving piece 13 in the vertical direction.

The linear vibration motor according to the present invention having such a structure generates a magnetic field having a fixed intensity and direction, and a coil 15 for generating a magnetic field whose intensity and direction are varied according to an electric signal of a specific frequency input from the outside. The electronic device and the like can be vibrated using the weight 17 and the elastic member 21 capable of maximizing the vibration of the magnet 7 and the coil 15 which is moved up and down with respect to the magnet 7. have.

Claims

A case 1 having one side open and an empty inside;

A bracket 5 capable of closing one side of the opened case 1 and having an extension piece 3 protruding outwardly of the case 1 at one edge thereof;

A magnet (7) attached to an inner top surface of the case (1) to generate a magnetic field having a fixed direction and intensity;

And a magnetic field mounted on the inner side of the case 1 to face the magnet 7 and varying in intensity and direction according to an electric signal of a specific frequency transmitted from the outside, and then mutually interacting with the magnetic field generated from the magnet 7. It is made of a vibrating body (9) which acts to vibrate in the longitudinal direction of the case (1),

The vibrating body 9 is inserted into the case 1 in a state where one side thereof faces the expansion piece 3, and a connection piece 11 capable of receiving an electrical signal of a specific frequency transmitted from the outside;

One side edge may be connected to the connecting piece 11 to receive an electrical signal of a specific frequency transmitted from the connecting piece 11 and may be moved in the longitudinal direction of the case 1 while being fixed to the connecting piece 11. Moving piece 13;

It is mounted on one side of the moving piece 13 facing the magnet 7 and receives an external electric signal transmitted to the moving piece 13 via the connecting piece 11 to generate a magnetic field of varying strength and direction. Coil 15 which can move in the longitudinal direction of the case 1 together with the moving piece 13 by interacting with the magnetic field of the magnet (7);

A weight 17 mounted on an outer circumferential surface of the coil 15 to move in the longitudinal direction of the case 1 together with the coil 15 to maximize the intensity of vibration;

A plate 23 mounted on one side of the magnet 7 facing the movable piece 13 to concentrate a magnetic field generated from the magnet 7 in a fixed direction;

And interposed between the connecting piece 11 and the weight 17, both sides are coupled to one side of the bracket 5 and one side of the weight 17, the through hole through which the moving piece 13 can pass in the center ( 31) A linear vibration motor, comprising an elastic member (21) capable of maximizing vibration generated from the weight (17) coupled with the coil (15) and transmitting it to the outside.
The method of claim 1,

Between the coil 15 and the weight 17, the magnetic field generated from the magnet 7 and the coil 15 can be evenly enclosed in a specific section so that the vibrating coil 15 of the case 1 A linear vibration motor, characterized in that the ring yoke (19) is mounted so as not to be biased in one direction from the inside.
The method of claim 1,

The peripheral surface of the magnet 7 and the plate 23 reduces the contact noise between the combination of the magnet 7 and the plate 23 and the coil 15, and with the magnet 7 and the plate 23 Linear vibration motor, characterized in that the magnetic fluid is applied to reduce the wear of the coil (15) and the magnet (7) and the plate 23 due to frequent contact between the made combination and the coil (15).
The method of claim 3, wherein

The outer shape of the plate 23 is a circular shape 23a, which is 5% to 10% smaller than the outer diameter of the magnet 7, or is composed of an elliptical 23b or cross shape 23c, and the shape of the magnet 7 and the plate 23 is reduced. A linear vibration motor, characterized by facilitating application of magnetic fluid to a circumferential surface.
The method of claim 1,

Linear vibration motor, characterized in that the buffer plate 25 is mounted between the bracket (5) and the moving piece (13) to reduce the contact noise generated between the moving piece (13) and the bracket (5).
The method of claim 1,

Between the connecting piece 11 and the moving piece 13, from the one end of the connecting piece 11 inserted into the inside of the case 1 with the edge of the moving piece 13 and a predetermined gap between the moving piece 13 While pivoting in the circumferential direction of (), the connecting guide 27 is mounted so that the end can be connected to the edge of the moving piece 13 so that the connecting piece 11 is interposed between the elastic member 21 and the bracket 5 and cannot move. In the state so that the moving piece 13 connected through the connecting piece 11 and the connecting guide 27 can be moved in the vertical direction of the case 1 through the through hole 31 of the elastic member 21,

The connecting piece 11, the moving piece 13 and the connection guide 27 is a linear vibration, characterized in that the positive pole printed circuit and the negative pole printed circuit is provided to receive an electrical signal of a specific frequency input from the outside. motor.
The method of claim 1,

The elastic member 21 has an outer ring 29 of the annular ring shape that can be fixed to one side of the bracket (5) sandwiching the connecting piece 11,

While having a predetermined distance in the height direction of the outer plate 29, has a through hole 31 smaller than the inner diameter of the outer plate 29, the inner side that can be coupled to one side of the weight 17 side Plate 33;

And while turning in the circumferential direction of the outer plate 29 or inner plate 33 between the outer plate 29 and the inner plate 33, both ends of the outer plate 29 and the inner plate 33 And a connecting bridge (35) which can be connected such that the inner plate (33) can be contracted or expanded relative to the outer plate (29).