KR20140128525A

KR20140128525A - Linear Actuator

Info

Publication number: KR20140128525A
Application number: KR20130046630A
Authority: KR
Inventors: 박준
Original assignee: 박준
Priority date: 2013-04-26
Filing date: 2013-04-26
Publication date: 2014-11-06

Abstract

A linear actuator according to the present invention includes a case with a preset space inside; a permanent magnet which is mounted on the case; a coil which is arranged outside the permanent magnet and generates a magnetic field when power is applied; a printed circuit board which supplies the power to the coil; a support member which is fixed to the outside of the coil; a plurality of weights which is fixed to both sides of the support member; a spring which is fixed to the support member through one side thereof, is connected to the case through the other side thereof, includes an inner fixing unit in the center, and is integrated with a plurality of operation units with elasticity to face each other based on the inner fixing unit; and a damping member which is mounted on a top case or a bottom case.

Description

[0001] The present invention relates to a linear actuator,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a linear actuator, and more particularly, to a linear actuator designed to be mounted on a personal portable terminal, a tablet PC, a game machine,

In general, one of the functions necessary for a communication device is a receiving function. This incoming function has the function of notifying by sound or vibration. The vibration function is mainly used when the melody or bell is transmitted to the outside through the speaker to prevent damage to the other person. For this vibration, a small actuator is driven so that the driving force is transmitted to the case of the device So that the device can vibrate. In recent years, as the spread of smart phones and tablets equipped with a touch screen is increasing, a vibration function has been required to provide a virtual touch feeling to a user beyond a simple incoming call function.

When only the incoming call function is needed, a weighted actuator is mainly used. However, in a device equipped with a touch screen, a linear actuator that performs a linear motion is mainly used because a quick response to a touch response is required.

In recent years, large-sized smartphones and tablets have been used in large-sized screens, and as a result, large-sized and heavy actuators have become necessary, and as the functions are diversified, various components are incorporated into electronic devices, It became necessary. Conventional linear motors have a circular shape, which causes unnecessary space as a circular outer shape when mounted on a circuit, has a wide width, is limited in the position to be mounted, has a small vibration power, There is a problem that it is difficult to feel.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems of the conventional art described above, and it is an object of the present invention to provide a permanent magnet, a coil, and a printed circuit board inside a case. When power is inputted from the outside through a printed circuit board, A linear actuator in which a weight is vertically vibrated by an acting electromagnetic force can utilize a gap in a narrow width shape, thereby providing a linear actuator having good mounting performance and high vibration power.

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

A permanent magnet mounted on the case, a coil disposed outside the permanent magnet for generating a magnetic field when power is applied, a printed circuit board for supplying power to the coil,

A plurality of weights fixed to both sides of the support member, one side fixed to the support member and the other side connected to the case, an inner fixed portion at the center, And a damping member mounted on the upper case or the lower case, the spring being integrally formed with a plurality of elastic moving parts facing the fixing part.

And a plate of a ferromagnetic material is placed on one side surface of the permanent magnet.

And the coil is coupled by the support member with a bond or caulking. The weight is bonded to the support member by bonding, caulking or welding. The plurality of weights may be integrally formed with holes in the inner side.

The spring is composed of a plurality of moving parts generating a vibration force by resonance with the inner fixed part, and a plurality of outer fixed parts connected to the moving part and fixed to the case. And the motion of the spring may have one or more curved shapes. Further, a hole may be formed in the moving part of the spring. In addition, a plurality of the springs may be formed, and the inner fixing portion of the spring may be integrally fixed with the supporting member.

The printed circuit board is formed of a flexible circuit board having at least one curved shape. The support member may be integrally formed with the spring.

The case is preferably formed in a rectangular parallelepiped shape. And

A weight disposed inside the case; a spring having one side fixed to the case and another side connected to the weight and having elasticity; a plurality of coils disposed at an outer end of the weight; A permanent magnet mounted on the case facing the coil, a printed circuit board for supplying power to the coil, and a damping member mounted on the case or the weight.

A metal plate may be used between the spring and the weight.

The features and advantages of the present invention will become apparent from the following detailed description based on the accompanying drawings. Prior to this, terms and words used in the present specification and claims should be construed in accordance with the spirit and scope of the present invention, on the basis of the principle that a concept of a term can be properly defined to explain it in a normal and best manner. Should be interpreted as

According to the present invention, a permanent magnet, a coil, and a printed circuit board are provided in an upper case and a lower case. When power is input from the outside through a printed circuit board, The present invention provides a linear actuator having a good fitting performance and a high vibration power because a clearance can be utilized in a narrow width shape.

1 is a cross-sectional view of an embodiment of a linear actuator
2 is an exploded perspective view of an embodiment of the linear actuator.
Fig. 3 Example of spring structure
Fig. 4: Example of printed circuit board structure
Sectional view of another embodiment of the linear actuator
6 is an exploded perspective view of another embodiment of the linear actuator.
7 shows another embodiment of the linear actuator

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

FIG. 1 is a sectional view of a linear actuator 100 according to the present invention, and FIG. 2 is an exploded perspective view of the linear actuator 100. As shown in the figure, the linear actuator 100 includes an upper case 110 having a predetermined space therein, a lower case 111 coupled to the upper case 110 to seal the linear actuator 100, A plate 129 fixed to the upper end of the permanent magnet 113 to constitute a magnetic circuit and disposed on the outer side of the permanent magnet 113; A printed circuit board 115 that supplies external power to the coil 125 and a coil 125 that generates a magnetic field generated by the permanent magnet 113 and the coil 125. [ A supporting member 118 for firmly fixing the coil 125 and the weight 127 and a supporting member 118 fixed to the supporting member 118 to be connected to the upper case 110, A spring 123 that moves in the vertical direction, 110 and consists of a damping member 120 to cushion the impact caused by contact of the lower case 111 and the internal components.

A space is formed in the upper case 110 so as to include the components of the linear actuator 100 and the lower case 111 is coupled to the opened surface of the upper case 110, It is sealed to prevent external impact or foreign matter. The upper case 110 and the lower case 111 are preferably formed using a ferromagnetic material such as metal to block electromagnetic noise generated from the linear actuator 100 from the outside.

The permanent magnet 113 is fixed to the lower case 111 and is formed on the inner side of the coil 125. When the power is applied to the coil 125, mutual electromagnetic force is generated, The weight 127 coupled with the coil 125 rises or falls to generate vibration.

A plate 129 made of a ferromagnetic material is disposed at the upper end of the permanent magnet 113 and a lower case 111 is provided at the lower end to increase the efficiency of the magnetic force.

The outer surface of the coil 125 is fixed to the inner surface of the support member 118 and the start line and the end line are connected to the printed circuit board 115 to receive power from the outside. The coil 110 and the printed circuit board 115 may be connected by soldering or heat welding.

The support member 118 prevents the coil 125 and the weight 127 from being damaged due to insufficient dropping strength or external impact when the weight 127 is directly coupled with the spring 123, The weight 127 is fixed by using a method such as caulking so that the weight 127 can be vibrated by the spring 123.

The weight 127 functions to increase the force of the generated vibration, and it is preferable to use a material having a large specific gravity such as tungsten in order to increase the mass.

3 shows an embodiment of the spring 123 among the components of the linear actuator 100 according to the present invention. 3 (a) is a perspective view of an embodiment of the present invention in which an inner fixing part 131 fixed to a support member 118, an outer fixing part 135 fixed to an upper case 110, And a moving part 133. FIG. 3 (b) shows another embodiment of the spring 123, which has a plurality of motion portions 133, which can improve the twisting of the spring 133. FIG. 3 (c) shows another embodiment of the present invention in which the motion part 133 is given a curved shape to disperse the force generated in the spring 123, thereby improving durability. 3 (d) shows a spring 123 formed by forming a plurality of holes in the moving part 133. As shown in FIG. 3 (e) consists of a plurality of springs 123.

Fig. 4 shows an embodiment of the printed circuit board 115. Fig. It is possible to improve the durability by forming a curvature in the printed circuit board 115 of FIG. 4A and dispersing the force applied to the printed circuit board 100 during operation of the linear actuator 100 .

FIG. 5 is a cross-sectional view of another embodiment of the linear actuator 100 according to the present invention, and FIG. 6 is an exploded perspective view of the embodiment of FIG. The linear actuator 100 is characterized in that the support member 118 is removed from the structure of the linear actuator 100 of the embodiment of Figure 1 and the coil 125 and the weight 127 are directly fixed to the spring 123 Thus, the structure of the linear actuator 100 can be simplified by removing the support member 118. [

7 is a view showing another embodiment of the linear actuator 100 according to the present invention. The weight 127 of the linear actuator 100 is integrated to increase the durability by making it strong against falling and impact, The linear actuator 100 can be vibrated by the magnetic force by fixing the coil 125 on both sides of the coil 125 and arranging the permanent magnet 113 on the facing surface of the coil 125. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not to be limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It is obvious that the present invention can be modified or improved by those skilled in the art. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: Linear actuator
110: upper case 111: lower case
113: permanent magnet 115: printed circuit board
118: support member 120: damping member
123: spring 125: coil
127: weight 129: plate
131: Inner fixing portion 133:
135:

Claims

A case having a predetermined space therein,
A permanent magnet mounted on the case,
A coil disposed outside the permanent magnet to generate a magnetic field when power is applied,
A printed circuit board for supplying power to the coil,
A support member fixed to the outside of the coil,
A plurality of weights fixed to both side surfaces of the support member,
A spring formed integrally with one side of the support member, the other side of the case being connected to the other side, an inner fixed portion formed at a central portion thereof, and a plurality of elasticized motion portions facing the inner fixed portion; And
And a damping member mounted on the upper case or the lower case.

The method according to claim 1,
Characterized in that a plate of a ferromagnetic material is placed on one side surface of said permanent magnet

The method according to claim 1,
Characterized in that the coil is coupled with the support member by a bond or caulking. &Lt; RTI ID = 0.0 >

The method according to claim 1,
Characterized in that the weight is coupled to the support member by bonding, caulking or welding.

The method according to claim 1,
Characterized in that the plurality of weights are integrally formed with holes on the inner side,

The method according to claim 1,
Wherein the spring is composed of a plurality of moving parts generating a vibration force by resonance due to elasticity with the inner fixed part, and a plurality of outer fixed parts connected to the moving part and fixed to the case.

The method according to claim 1,
Wherein the spring is constituted by a plurality of springs, and the inner fixing portion of the spring is fixed integrally with the supporting member.

The method according to claim 1,
Characterized in that the motion of the spring has at least one curved shape,

The method according to claim 1,
Characterized in that the linear actuator forms a hole in the moving part of the spring

The method according to claim 1,
Wherein the printed circuit board is formed of a flexible circuit board having at least one curved shape,

The method according to claim 1,
Characterized in that the support member is formed integrally with the spring. The linear actuator

The method according to claim 1,
Characterized in that the case is formed in a rectangular parallelepiped shape,

A case having a predetermined space therein,
A weight disposed inside the case,
A spring having one side of the case fixed and the other side connected to the weight and having elasticity,
A plurality of coils disposed at an outer end of the weight,
A permanent magnet mounted on the case facing the coil,
A printed circuit board for supplying power to the coil,
And a damping member mounted on the case or the weight.

14. The method of claim 13,
And a metal plate is used between the spring and the weight to fix the linear actuator