KR100992264B1 - Linear Type Vibration Motor - Google Patents

Abstract

The linear vibration motor according to the present invention includes a case accommodating a mass body in which an inner groove is formed; A movable part fixed to the mass; A coil through which current flows to horizontally move the movable part together with the mass by an interaction of an electromagnetic field; A connector fixed at one end to the case and the other end to the inner groove, for partitioning the inner groove; And an elastic member disposed on both sides of the inner groove with respect to the connector to define a limit of horizontal movement of the mass.

Description

Linear Vibration Motor {Linear Type Vibration Motor}

The present invention relates to a linear vibrating motor, and more particularly, to a linear vibrating motor which is mounted to a personal portable terminal and designed to vibrate in a horizontal direction.

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 that transmits vibration to the device.

Among these functions, the vibration function is mainly used when a melody or a bell is transmitted to the outside through a speaker so as not to damage others. For this vibration, it is common to drive a small vibration motor so that the driving force is transmitted to the case of the device so that the device can vibrate.

In particular, LCDs such as a touch screen method have been adopted in recent years due to miniaturization and high quality of mobile phones, and improvement of vibration motors is becoming increasingly important, such as requiring a function to generate vibrations when touched.

Vibration motors currently applied to mobile phones use a method of generating a rotating force to obtain mechanical vibration by rotating a rotating part of an unbalanced mass. Most of the rotating force is rectified through a contact point between a brush and a commutator, and a current is applied to the rotor coil. It is generated as a structure for supplying.

However, the brush type structure using such commutator causes mechanical friction and electrical spark as the brush passes between the segment of the commutator and the segment between the segments when the motor rotates, and wears the brush and commutator. By doing so, there is a problem of shortening the life of the motor.

In addition, since the rotational inertia is used when a voltage is applied to the motor, it takes a long time to reach the target vibration amount, which makes it difficult to implement vibration suitable for a personal mobile terminal using a touch screen.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a linear vibration motor suitable for linear vibration along a straight path in one dimension and reducing the thickness of a personal portable terminal.

The linear vibration motor according to the present invention includes a case accommodating a mass body in which an inner groove is formed; A movable part fixed to the mass; A coil through which current flows to horizontally move the movable part together with the mass by an interaction of an electromagnetic field; A connector fixed at one end to the case and the other end to the inner groove, for partitioning the inner groove; And an elastic member disposed on both sides of the inner groove with respect to the connector to define a limit of horizontal movement of the mass body.

In addition, the movable part of the linear vibration motor according to the present invention may be characterized in that it comprises a magnet for providing a magnetic force for the horizontal movement of the mass body, and a yoke for determining the magnetic force direction of the magnet.

In addition, the yoke of the linear vibration motor according to the present invention may be characterized in that it is located between the magnet and the mass.

In addition, the case of the linear vibration motor according to the present invention may include a guide bar for guiding a movement path of the mass body, the mass body may be characterized in that the guide groove corresponding to the guide bar is formed.

In addition, the elastic member of the linear vibration motor according to the present invention may be characterized in that it comprises a coil spring.

In addition, the elastic member of the linear vibration motor according to the present invention may be characterized in that it comprises a leaf spring.

In addition, the elastic member of the linear vibration motor according to the present invention may be characterized in that it comprises a torsion spring.

In addition, the mass of the linear vibration motor according to the present invention may be characterized in that it comprises a seating portion formed to seat the yoke inside.

In addition, the coil of the linear vibration motor according to the present invention may be characterized in that a plurality is arranged side by side on the substrate.

Since the linear vibration motor according to the present invention linearly vibrates in the horizontal direction instead of the thickness direction of the personal portable terminal, it has the effect of reducing the thickness of the personal portable terminal and can be formed long in the vibration direction irrespective of the thickness of the terminal. Can be improved.

In addition, since the linear vibration motor according to the present invention has an inner groove for accommodating an elastic member and a connector fixed to the case on one surface of the mass body, it is possible to effectively transmit the vibration transmitted from the mass body to the case, the elastic member inside the mass body Easily mounted in the groove, there is no need for a separate fixing structure for fixing the elastic member.

A linear vibration motor according to the present invention will be described in more detail with reference to FIGS. 1 to 7. Hereinafter, with reference to the drawings will be described in detail a specific embodiment of the present invention.

However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may deteriorate other inventions or the present invention by adding, modifying, or deleting other elements within the scope of the same idea. Other embodiments that fall within the scope of the inventive concept may be readily proposed, but they will also be included within the scope of the inventive concept.

1 is a perspective view for explaining a linear vibration motor according to a first embodiment of the present invention, Figure 2 is an exploded perspective view for explaining a state coupled to the linear vibration motor of Figure 1, Figure 3 is a linear of Figure 1 4 is a view for explaining the movement of the vibration motor, Figure 4 is a perspective view for explaining a support plate in the linear vibration motor of FIG.

1 to 4, the linear vibration motor 100 includes a support plate 110, a movable part 120, a mass body 130, an elastic member 140, and a case 150.

The support plate 110 accommodates the substrate 114 therein, protects the components mounted inside, and serves to mount the components. The support plate 110 is preferably formed to correspond to the shape of the case 150, but is not limited thereto, and may be variously designed according to the intention of the designer.

The substrate 114 is mounted on the support plate 110 and preferably includes a flexible circuit board. In addition, a plurality of coils 112 are electrically connected to the upper surface of the substrate 114, and are formed in an elongated shape in the center to be connected to the outer substrate.

In addition, the coil 112 is formed in a shape that is widely wound in a plane, and a plurality of coils 114 are disposed side by side. Such side-by-side arrangement means that the substrate 114 is widely disposed on the top surface of the substrate 114. At this time, it is preferable that an alternating current flows through the coil 112, and the movable part 120 vibrates the mass body 130 by this structure.

The movable part 120 is provided between the mass body 130 and the coil 112, and the movable part 120 includes a magnet 122 and a yoke 124.

At this time, the movable part 120 determines the movement direction according to the Lorentz force by the electric force of the frequency generated in the coil 112 and the direction of the magnetic field generated in the direction toward the yoke 124 in the magnet 122.

The magnet 122 is located above the coil 112 and the shape is formed in a hexahedral shape. At this time, due to the interaction between the magnetic force by the magnet 122 and the electromagnetic force of a predetermined frequency generated in the coil 112, the movable portion 120 vibrates in the horizontal direction with the coil 112 (arrow).

The yoke 124 is disposed between the magnet 122 and the mass body 130, it is preferable that the magnet 122 is attached to the bottom. The yoke 124 may be seated and fixed to the seating portion 132 formed on the bottom surface of the mass body 130. However, the shape of the yoke 124 is not limited thereto and may be variously designed according to the intention of the designer.

Therefore, since the movable part 120 is fixed to the mass body 130, the mass body 130 moves together in the same direction as the moving direction of the movable part 120.

The mass body 130 preferably has a certain size of mass and vibrates in the vibration direction by the interaction of the magnet 122 and the coil 112. Here, the vibration direction means a direction parallel to the coil 112 (arrow).

The upper surface of the mass body 130 is provided with an inner groove 136 for accommodating the elastic member 140 and the connector 152. In addition, guide grooves 134 for accommodating the guide bar 154 are provided along both sides of both sides of the mass body 130.

The guide groove 134 is formed in a square shape to the inside of the mass body 130, but is not limited thereto. The guide groove 134 may be formed in a round shape along the outer surface of the guide bar 154.

The guide bar 154 is formed to be fixed to the inside of the case 150, and two guide bars 154 are disposed inside the case 150 symmetrically with each other. Guide bar 154 is formed in a long cylindrical shape, but is not limited thereto. At this time, the guide bar 154 is preferably fixed to the case 150 using an adhesive or O-ring.

Therefore, the mass body 130 is moved in the horizontal direction with the ground by the movable unit 120, at this time can move more stable because it moves along the guide bar 154.

In addition, an inner groove 136 is formed at an upper portion of the mass body 130, and an elastic member 140 and a connector 152 are inserted into the inner groove 136.

At this time, the connector 152 is preferably formed in a cube shape is fixed to the inner upper surface of the case 150. However, the shape of the connector is not limited thereto, and the connector may be formed integrally with the case.

In addition, when the connector 152 is inserted into the center of the inner groove 136 of the mass body 130, the elastic member 140 is inserted into both sides around the connector 152.

Therefore, when the mass body 130 moves, the elastic member 140 may be contracted and tensioned to transmit a force moved to the connector 152.

In addition, since the elastic member 140 is inserted into and fixed to the inner groove of the mass body 130, there is no need for a separate structure to fix the elastic member, thereby simplifying the structure. The elastic member is formed in the inner groove of the mass body 130. It can be contracted and tensioned without any deformation to transmit vibrations more effectively.

In this case, the elastic member 140 preferably includes a coil spring, but is not limited thereto. Various configurations that may provide an elastic force may be selectively applied. And, it is arranged to both sides with respect to the connector 152 serves to determine the limit of the horizontal movement of the mass body 130 is vibrated in the horizontal direction.

5 is a view for explaining the movement of the elastic member in the first embodiment of the present invention.

Referring to FIG. 5A, a connector 152 is disposed at an inner groove 136 on one surface of the mass body 130 so as to be centrally located. Then, two elastic members 140 are inserted into the inner groove 136 so that both ends thereof are fixed to the left and right sides of the connector 152.

As shown in FIG. 5B, when the mass body 130 moves to the right side, the elastic member 140 on the left side contracts and the elastic member 140 positioned on the right side is stretched.

In addition, as shown in FIG. 5C, when the mass body 130 moves to the left side, the elastic member 140 on the left side is stretched and the elastic member 140 on the right side contracts. Accordingly, the force against the vibration of the mass body 130 can be more effectively transmitted by the elastic force of the elastic member 140. In addition, the elastic member 140 disposed to both sides with respect to the connector 152 and vibrating in the horizontal direction plays a role of determining a limit of horizontal movement of the mass body 130.

In this embodiment, since the linear vibration motor is designed to vibrate in a horizontal direction on the ground, the linear vibration motor vibrates in the horizontal direction instead of the thickness direction of the personal portable terminal when mounted on the personal portable terminal, thereby reducing the thickness of the personal portable terminal. Thereby, since the length of a linear vibration motor can be made long in a horizontal direction, vibration performance can be improved more.

6 is a perspective view for explaining a linear vibration motor according to a second embodiment of the present invention.

Referring to FIG. 6, the linear vibration motor 200 includes a support plate 110, a movable part, a mass body 130, an elastic member 240, and a case 150.

In this embodiment, since the support plate 110, the movable portion, the mass body 130 and the case 150 are substantially the same as the first embodiment, a detailed description thereof may be omitted.

The elastic member 240 is inserted into the inner groove of the mass body 130 and fixed, and the elastic member 240 preferably includes a torsion spring.

Therefore, in the present embodiment, since there is no separate structure to fix the elastic member, the structure can be further simplified, and the elastic member 240 is contracted and stretched without any deformation in the inner groove of the mass 130 to more effectively vibrate. I can deliver it.

7 is a perspective view for explaining a linear vibration motor according to a third embodiment of the present invention.

Referring to FIG. 7, the linear vibration motor 300 includes a support plate 110, a movable part, a mass body 130, an elastic member 340, and a case 150.

In this embodiment, since the support plate 110, the movable portion, the mass body 130 and the case 150 are substantially the same as the first embodiment, a detailed description thereof may be omitted.

The elastic member 340 is inserted into and fixed to the inner groove of the mass body 130 and the elastic member 340 preferably includes a leaf spring. At this time, the reason why the elastic member is configured differently is that the resonant frequency is determined according to the spring constant and the weight of the mass, and this constant greatly affects the vibration of the mass.

Therefore, in the present embodiment, since there is no separate structure to fix the elastic member, the structure can be further simplified, and the elastic member 340 is contracted and tensioned without any deformation in the inner groove of the mass 130 to more effectively vibrate. I can deliver it.

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

FIG. 2 is an exploded perspective view for explaining a state in which the linear vibration motor of FIG. 1 is coupled.

3 is a view for explaining the movement of the linear vibration motor of FIG.

4 is a perspective view illustrating a support plate in the linear vibration motor of FIG. 1.

5 is a view for explaining the movement of the elastic member in the first embodiment of the present invention.

6 is a perspective view for explaining a linear vibration motor according to a second embodiment of the present invention.

7 is a perspective view for explaining a linear vibration motor according to a third embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110 .... support plate 120 .... moving parts

130 .... Mass 140 .... Elastic member

150 ... case

Claims (9)

A case accommodating a mass in which an inner groove is formed; A movable part fixed to the mass; A coil through which current flows to horizontally move the movable part together with the mass by an interaction of an electromagnetic field; A connector fixed at one end to the case and the other end to the inner groove, for partitioning the inner groove; And An elastic member disposed on both sides of the inner groove with respect to the connector to define a limit of horizontal movement of the mass; Linear vibration motor comprising a. The method of claim 1, The movable part, And a yoke for determining a magnetic force direction of the magnet and a magnet providing a magnetic force for horizontal movement of the mass. The method of claim 2, The yoke is a linear vibration motor, characterized in that provided between the magnet and the mass. The method of claim 2, The mass is And a seating portion formed to seat the yoke inside. The method of claim 1, And a guide bar for guiding a movement path of the mass body on both side surfaces of the case, wherein the mass body has guide grooves corresponding to the guide bar. The method of claim 1, And the elastic member comprises a coil spring. The method of claim 1, And the elastic member comprises a leaf spring. The method of claim 1, The elastic member includes a torsion spring. The method of claim 1, The coil is, A linear vibration motor, characterized in that a plurality are arranged side by side on the substrate.

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