KR101452738B1 - Linear motor - Google Patents

Abstract

The present invention relates to a linear motor in which a magnetic field externally flowing out is reduced and does not affect other elements. According to the present invention, leakage of a magnetic field can be minimized while minimizing thickness, Lt; / RTI >

Description

Linear motor {LINEAR MOTOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear motor, and more particularly, to a linear motor in which a magnetic field flowing out to the outside is reduced so as not to affect other elements.

2. Description of the Related Art In recent years, personal portable terminals equipped with a separate stylus pen and equipped with a magnet on a stylus pen have been available for personal mobile terminals employing a touch screen method. In this way, determining whether the stylus pen is approaching is very sensitive to other magnetic fields around it, since it must sense the strength of the magnetic force.

However, recently, the personal portable device has been made slim for reasons of convenience and aesthetics of users, and not only the arrangement of the parts to be mounted in the inside becomes dense, but also the parts are miniaturized, so that a magnetic field interference problem may occur.

In particular, a vibration motor is a component that converts electrical energy into mechanical vibration through mutual action of a coil and a magnet. In recent years, a linear vibration motor is generally used instead of a rotary vibration motor which has been used for a long time because of its quick response and long life. This is disclosed in detail in Korean Patent No. 10-1046003 (2011.06.27) and 10-1055562 (Aug. 02, 2011) as a conventional technique for a linear vibration motor.

In a linear vibration motor, a vibrator coupled with an elastic body generates vibration while resonating up and down in accordance with the resonance frequency. Since the up-and-down resonance displacement must be secured, a magnet having a relatively strong magnetic force has to be used in order to reduce the thickness. The use of the magnet having such a strong magnetic force has caused a problem that interference between the magnet and the magnetic field of other parts, particularly the stylus pen, occurs.

Therefore, it is urgently required to study vibration motors which are thin in thickness while ensuring a vibration level above a certain level, and magnetic fields do not flow out to the outside.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration motor which can reduce a magnetic field flowing outward while being thin.

According to an embodiment of the present invention, there is provided a linear motor comprising: a housing defining an inner space of a predetermined size; at least one magnet disposed inside the housing and generating magnetic force; a coil generating an electromagnetic force in interaction with the magnet; A vibrator having an oscillator and a weight that oscillates integrally with the coil, an oscillator and an elastic member coupled to the inside of the case to provide an elastic force, and a substrate coupled to the oscillator and transmitting an electric signal to the coil, The housing includes a primary plating layer plated on the surface of at least a part of the housing and a secondary plating layer plated on the surface of at least a part of the primary plating layer.

Here, the housing may include a case having an inner space of a predetermined size and an open bottom, and a bracket coupled with the case to define the inner space.

In addition, one selected from the primary plating layer or the secondary plating layer may be a ferromagnetic material.

According to another embodiment of the present invention, there is provided a linear motor comprising: a housing which forms an internal space of a predetermined size; at least one magnet disposed inside the housing and generating a magnetic force; An oscillator having an oscillator and an elastic member coupled to an inner side of the case to provide an elastic force, a substrate coupled to the oscillator and transmitting an electric signal to the coil, And an adhesive member that is bonded to an outer surface of the housing to provide an adhesive force, and the adhesive member may include a shielding layer that shields magnetic force flowing out of the housing.

According to another embodiment of the present invention, there is provided a linear motor comprising: a housing defining an inner space of a predetermined size; at least one magnet disposed inside the housing and generating a magnetic force; A vibrator having an oscillator and an elastic member coupled to the inside of the case to provide an elastic force, a substrate coupled to the oscillator and transmitting an electric signal to the coil, And a cushioning member coupled to an outer surface of the housing to absorb an impact, wherein the cushioning member may include a shielding layer that shields a magnetic force flowing out of the housing.

According to the linear motor of the present invention, the outflow of the magnetic field can be minimized while minimizing the thickness.

Further, by maintaining the displacement of the vibrator, an appropriate vibration amount can be maintained.

1 is a sectional view of a linear motor according to an embodiment of the present invention.
2 is a sectional view of a housing of a linear motor according to an embodiment of the present invention.
3 is an exploded perspective view of a linear motor according to an embodiment of the present invention.
4 is a comparative graph showing the effect of a linear motor according to an embodiment of the present invention.
5 is a sectional view of a linear motor according to an embodiment of the present invention.
6 is an exploded perspective view of a linear motor according to an embodiment of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the underlying concepts of the embodiments described. However, those skilled in the art will recognize that the embodiments described may be practiced without some or all of these specific details. In other instances, well-known components have not been described in detail so as not to unnecessarily obscure the basic concept of the present invention.

The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited by the embodiments described below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the components in the drawings are exaggerated in order to emphasize a clearer explanation.

Throughout the specification, throughout the specification, when an element is referred to as being "connected" or "coupled" with another element, it is understood that it is not necessarily the case that the element is directly connected or directly coupled, Or " electromagnetically coupled "or" electromagnetically coupled " Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. Respectively.

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

FIG. 1 is a schematic cross-sectional view of a linear motor 600 according to a first embodiment of the present invention, and FIG. 2 is a schematic exploded cross-sectional view of a housing 100 of the linear motor 600 shown in FIG. 3 is a schematic exploded perspective view of the linear motor 600 shown in Fig.

1 and 3, a linear motor 600 according to a first embodiment of the present invention includes a housing 100, a magnet 200, a vibrator 300, an elastic member 400, and a substrate 500 .

The housing 100 may form an internal space of a predetermined size. The magnet 200, the vibrator 300, the elastic member 400, and the substrate 500 may be mounted on the inner space formed by the housing 100. Typically, the housing 100 is cylindrical and can form a cylindrical interior space.

The housing 100 includes a primary plating layer 113 and a plated primary plating layer 113 on the surface of at least a part of the housing 100 and a secondary plating layer 115 and 135 plated on the surface of at least a part of the primary plating layers 113 and 133. [ . ≪ / RTI >

The primary plating layers 113 and 133 may be plated on the surface of at least a part of the main bodies 111 and 131 of the housing. The secondary plating layers 115 and 135 can be plated on the surface of at least a part of the primary plating layers 113 and 133. [ The secondary plating layers 115 and 135 are formed on at least a part of the surfaces of the primary plating layers 113 and 133 as well as at least a part of the main bodies 111 and 131 of the housing in which the primary plating layers 113 and 133 are not formed Can be plated on the surface.

The housing 100 may include a case 110 having an open bottom and a bracket 130 coupled to the case 110 to define the internal space.

The lower portion of the case 110 may be coupled with the bracket 130 to form an inner space. Typically, the case 110 may be cylindrical with the bottom open.

The case 110 includes a main body 111 forming a main shape of the case 110, a primary plating layer 113 plated on at least a part of the surface of the main body 111, And a second plating layer 115 plated on at least a part of the second plating layer 115. [

1 and 2, a primary plating layer 113 is plated on the entire surface of the main body 111, and a secondary plating layer 115 is plated on the entire primary plating layer 113 . The primary plating layer 113 may be plated on a part or all of the main body 111. The secondary plating layer 115 may be formed by coating a part or all of the surface of the primary plating layer 113 and the primary plating layer 113 If there is a main body 111 that is not plated, it may be plated on some or all of its parts.

The bracket 130 can be engaged with the lower surface of the case 110. Therefore, when the case 110 is cylindrical in shape with its bottom opened, it may be of a disc shape corresponding to the lower portion of the case 110 of the bracket 130.

The bracket 130 includes a main body 131 forming a main shape of the bracket 130, a primary plating layer 133 plated on at least a part of the surface of the main body 131, And a second plating layer 135 plated on at least a part of the second plating layer 135. [

1 and 2, a primary plating layer 133 is plated on the entire surface of the main body 131, and a secondary plating layer 135 is plated on the entire primary plating layer 133 . The primary plating layer 133 may be plated on a part or all of the main body 131 and the secondary plating layer 135 may be formed by coating a part or all of the surface of the primary plating layer 133 and the primary plating layer 133 If there is a main body 131 that is not plated, it may be plated on part or all of the part.

A portion of the housing 100 includes the primary plating layers 113 and 133 and the secondary plating layers 115 and 135 so that a selected one of the case 110 and the bracket 130 of the housing 100 is a primary Plating layers 113 and 133, and secondary plating layers 115 and 135. [

Typically, the case 110 and the bracket 130 may include a primary plating layer 113, 133 and a secondary plating layer 115, 135 to be combined with a magnet 200 to be described later. Referring to FIGS. 1 and 3, the magnet 200 is coupled to the bracket 130. Therefore, as shown in FIGS. 1 and 3, when the magnet 200 is coupled to the bracket 130, only one selected from the case 110 and the bracket 130 has two plating layers. The plating layer 133 and the plating layer 135 may be formed. At this time, not only the bracket 130 but also the case 110 may have two plating layers 113 and 115, and in this case, the effect of shielding the magnetic field, which is an effect of the present invention, will be further increased.

When two or more magnets 200 are mounted on the housing 100 and one magnet 200 is coupled to the bracket 130 and the other magnet 200 is coupled to the case 110, And the bracket 130 may have two plated layers.

A selected one of the primary plating layers 113 and 133 and the secondary plating layers 115 and 135 of the housing 100 may be ferromagnetic. The non-selected plating layer is preferably plated with a metal which is not a ferromagnetic material. For plating with a metal other than a ferromagnetic material, for example, a metal such as a paramagnetic substance or a semi-magnetic substance is preferably used.

When a ferromagnetic material and a metal other than a ferromagnetic material are plated doubly, the plating layer of the ferromagnetic material can prevent leakage of magnetic force similarly to the shielding plate.

FIG. 4 illustrates the shielding effect of the embodiment in which the primary plating layer 133 and the secondary plating layer 135 are formed on the bracket 130. Referring to FIG. 4, it can be seen that the leakage magnetic force of the linear motor according to the embodiment of the present invention is about 45.4% lower than that of the conventional linear motor.

The magnet 200 is disposed inside the housing 100 and generates a magnetic force. The linear motor 600 may include at least one magnet 200. Generally, the magnet 200 may be bonded to the upper surface of the bracket 130 through an adhesive or the like in a bonding manner.

The vibrator 300 may include a coil 310 that generates an electromagnetic force in cooperation with the magnet 200 and a weight 330 that vibrates integrally with the coil 310. The vibrator 300 is coupled with the elastic member 400 and is vibrated by receiving an elastic force.

The coil 310 may be formed in a ring shape through which the magnet 200 penetrates in the central portion and the weight 330 may be formed in an annular shape that can be coupled to the outer circumferential surface of the coil 310. The coil 310 and the weight 330 can be coupled through the coupling member 350. Therefore, the inner diameter of the coil 310 may be larger than the outer diameter of the magnet 200 and the protrusion. The inner diameter of the weight 330 may be the same as or slightly larger than the outer diameter of the coil 310. The weight 330 may be formed so that the outer circumferential surface of the weight 330 is smaller than the inner circumferential surface of the housing 100 so that the weight 330 does not come into contact with the housing 100 when vibrating.

The coil 310 may receive an AC electrical signal having a specific frequency from the substrate 500. The coil 310 and the weight 330, which are supplied with an AC electric signal, interact with the magnet 200 to vibrate at a specific natural frequency.

The weight 330 may be a vibrator 300 that vibrates together with the coil 310. The weight 330 can adjust the resonance frequency and adjust the amount of vibration by increasing the mass of the vibrator 300.

The substrate 500 is coupled with the vibrator 300 and transmits an electric signal to the coil 310. The substrate 500 is composed of a vibrating piece 510 that vibrates integrally with the vibrator 300 and a connecting piece 530 that extends from the vibrating piece 510 and is connected to the outside.

The vibrating element 510 may be a flexible material or an elastic material so as to be able to oscillate integrally with the vibrator 300. For example, it may be a flexible printed circuit board (FPCB), but is not limited thereto.

One end of the vibrating element 510 is coupled with the vibrator 300 to supply an alternating current electrical signal having a specific frequency to the coil 310. [ The other end of the vibrating element 510 extends to the connecting piece 530.

The connecting piece 530 is disposed on the upper surface of the bracket 130 and receives an alternating current electric signal having a specific frequency from the outside. Therefore, a terminal portion that can be connected to the outside may be formed at one end of the connecting piece 530. [

The vibrating element 510 may be installed so as to surround at least a part of the outer circumferential surface of the magnet 200 so that the magnet 200 is not brought into contact with the vibrating element. Since the vibrating element 510 surrounds the magnet 200, the vibrating element 510 may have a shape corresponding to a part of a circle or a shape of a circle that forms at least one circle in a circumferential direction. The outer circumference of the circulating circle is formed to be larger than the outer diameter of the side portion of the magnet 200 so that the outer circumference of the circulating circle is not in contact with the magnet 200 .

5 is a cross-sectional view of a linear motor 700 according to a second embodiment of the present invention, and FIG. 6 is an exploded perspective view of the linear motor 700 shown in FIG. For convenience of explanation, the second embodiment will be described with reference to Figs. 5 and 6, focusing on differences from the first embodiment.

The linear motor 700 according to the second embodiment may include an adhesive member 140 that bonds to the outer surface of the housing 100 to provide an adhesive force. The adhesive member 140 provides an adhesive force necessary for mounting the linear motor 700. [ A member coated with an adhesive on both sides may be used so that one side can be attached to one side of the housing 100 and the other side can be attached to a position where the linear motor 700 is to be mounted.

The adhesive member 140 may have an adhesive layer 141 for providing an adhesive force and a shielding layer 143 for shielding a magnetic force flowing out of the housing 100. 5 and 6, the shielding layer 143 is formed on one side of the adhesive layer 141, but the shielding layer 143 may be formed on one side of the adhesive member 140, (Not shown). Typically, the shielding layer 143 may be formed as a layer of a material containing metal particles through a spraying process or the like. The shielding layer 143 can shield a certain portion of the magnetic force flowing out of the housing 100.

The linear motor 700 according to the third embodiment may include a cushioning member 120 that is coupled to an outer surface of the housing 100 to absorb an impact. The cushioning member 120 can attenuate the occurrence of abrasion or joints by friction of the linear motor 700 with other elements or the like when the linear motor 700 vibrates. A material having a cushion is typically used, and one surface thereof may be attached to one surface of the housing 100. [ The buffer member 120 may be coupled to the opposite surface of one side of the housing 100 to which the adhesive member 140 is coupled.

The buffer member 120 may include a buffer layer 121 for providing a buffering effect and a shielding layer 123 for shielding a magnetic force flowing out of the housing 100. 5 and 6, the shielding layer 123 is formed on one surface of the buffer layer 121, but the shielding layer 123 may be formed on one surface of the buffer member 120, (Not shown). Generally, the shielding layer 123 may be formed as a layer of a material formed of metal particles through a spraying process or the like. The shielding layer 123 may shield a certain portion of the magnetic force flowing out of the housing 100.

100: Housing
110: Case 111: Main body
113: primary plating layer 115: secondary plating layer
120: buffer member
121: buffer layer 123: shield layer
130: Bracket 131: Main body
133: primary plating layer 135: secondary plating layer
140:
141: adhesive layer 143: shielding layer
200: Magnet
300: oscillator
310: coil 330: weight
400: elastic member
500: substrate

Claims (5)

As a linear motor,
A case which forms an internal space of a predetermined size and has an open bottom;
A bracket coupled with the case to define the inner space;
At least one magnet coupled to any one or both of the case and the bracket and generating a magnetic force;
A vibrator having a coil for generating an electromagnetic force in interaction with the magnet and a weight for oscillating as a unit with the coil;
An elastic member which is combined with the vibrator and the case to provide an elastic force; And
A substrate coupled to the vibrator and configured to transmit an electrical signal to the coil,
A primary plating layer plated on a surface of at least a part of the case or the bracket combined with the magnet, and a secondary plating layer plated on a surface of at least a part of the primary plating layer.
The method according to claim 1,
And a secondary plating layer plated on a surface of at least a part of the primary plating layer, and a secondary plating layer plated on a surface of at least a part of the case or the bracket not joined with the magnet.
3. The method of claim 2,
Wherein the secondary plating layer plated on the surface of at least a part of the bracket and the secondary plating layer plated on the surface of at least a part of the case are in contact with each other.
The method according to claim 1,
Wherein the selected one of the primary plating layer and the secondary plating layer is a ferromagnetic material and the other is a paramagnetic material or a semi-magnetic material.









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