KR102074820B1 - Auto focusing actuator for small camera - Google Patents

Abstract

Disclosed is an autofocusing actuator for a small camera. AF actuator according to an embodiment of the present invention, an AF actuator installed in the space portion of the camera module, the lens is coupled to the inside, the lens carrier to move up and down in the space; A damping conductor disposed outside the lens carrier; A coil wound outside the lens carrier; And a magnet installed in the housing forming the space part corresponding to the damping conductor.

Description

Auto focusing actuator for small camera

TECHNICAL FIELD The present invention relates to a small camera, and more particularly, to an autofocusing actuator (AF actuator) for a small camera.

In mobile devices such as mobile phones, small cameras are used for shooting and video calls. The compact camera is equipped with an AF actuator (AF Actuator or VCM) to implement Auto Focusing.

1 is a cross-sectional view of a camera module to which an AF actuator is applied, FIG. 2 is a graph showing a current applied during an autofocusing operation, and FIG. 3 is a graph showing a drive part response trace according to a change in applied current.

Referring to FIG. 1, the camera module 1 is provided with an AF actuator including a lens 21, a lens carrier 20, and a coil 22 in the housing 10.

PCB 12 and sensor 13 are installed at the bottom of the AF actuator. The sensor 13 may be an image sensor for sensing an image incident through the lens 21, and the PCB 12 may be an image signal processor for processing an image signal generated by the sensor 13, and a target position value for autofocus. It may include a control unit for moving to.

Here, the AF actuator windings the coil 22 on the outside of the lens carrier 20 for fixing the lens 21 to enable the up and down driving of the lens 21 to implement the autofocusing function, the coil 22 ) And has a structure in which the magnet 11 is disposed. When a current is applied to the coil 22 when necessary, autofocusing is performed by using an electromagnetic force generated between the coil 22 and the magnet 11. One end is fixed to the housing 10, the other end is easily restored to the initial state by providing the elastic force in the vertical direction by using a plurality of springs (14, 15) in contact with the upper and lower surfaces of the lens carrier 20, respectively. Can be.

The camera module 1 equipped with the AF actuator is in an initial state by a current applied to the coil 22 by the lens carrier 20 including the lens 21 and the driving part including the coil 22 during the autofocusing operation. Move to AF state (Macro) from (Infinite).

At this time, the distance A from the upper surface of the sensor 13 to the upper surface of the lens 21 is added to the moving amount of the driving part to be A + B (see FIG. 1B).

The current applied in the autofocusing operation is as shown in FIG. 2. Here, the X axis represents the applied current (mA), and the Y axis represents the amount of movement of the driving part (µm).

FIG. 2A is a graph illustrating a case where the initial state is switched to the AF state. There is no movement of the drive part until the applied current reaches αmA. The driving part moves after αmA, and it is initial state at βmA and AF state at γmA.

FIG. 2B is a graph illustrating a case where the initial state is changed from the AF state. The operation is reversed to the operation shown in FIG.

When the camera module 1 including the AF actuator is operated, βmA is applied to the driving part including the lens 21 to move to the infinite focus position (initial state, Infinite), and for autofocusing operation, γmA or A current between "γ mA and β mA" is applied.

The movement amount B of the driving part shown in FIG. 1B is adjusted according to the distance from the lens 21 to the subject, and the driving part moves from the initial state to the AF state so as to show characteristics as shown in FIG. 3. do.

In FIG. 3, the overshoot is {{ΔP / SettlingStroke} × 100} (%).

ΔP is a maximum peak value, and SettlingStroke is an output (drive part response trajectory) target position value according to an input (applied current) change, and is a drive part target position value (P1-P0) for autofocusing.

The error band is the settling specification of the output (driving part response trajectory), and the settling time (SettlingTime [ms]) is the output (driving part response trajectory) when the input (applied current) is changed. Time to stabilize, ie T1-T0.

Here, the smaller ΔP, the shorter the stabilization time, the shorter the stabilization time, the shorter the autofocusing operation time in the camera module (1). This is related to camera performance, that is, the focusing speed when photographing a subject and the focusing speed when a subject moves or changes a subject when capturing an image.

In the existing AF actuators, damping effects have been used in driver ICs that use a damper bond or apply current to reduce stabilization time. In the case of the damper bond, there is a problem in that it is difficult to manage due to a variation in damping effect depending on the amount of coating or the application position. The damping effect can be realized in the driving IC, but there is a limit to minimizing the stabilization time deviation of the product due to the individual deviation between the AF actuators.

Korean Patent Publication No. 10-2010-0129930 (published Dec. 10, 2010)-Auto Focus Camera Module

The present invention can reduce the autofocusing time by reducing the stabilization time during the autofocusing operation of the camera module by reducing the maximum peak value (ΔP) of the stroke with the damping effect of the driving IC without using a separate damper bond. It is to provide an autofocusing actuator for a camera.

Other objects of the present invention will be readily understood through the following description.

According to an aspect of the present invention, an AF actuator installed in the space of the camera module, the lens is coupled to the inside, the lens carrier to move up and down in the space; A damping conductor disposed outside the lens carrier; A coil wound outside the lens carrier; And a magnet installed in the housing corresponding to the damping conductor to form the space part.

In one embodiment, the magnet may be magnetized with one polarity.

The magnet may have different polarities between inner and outer surfaces thereof.

The damping conductor may include N pieces arranged in all directions, the magnets may include N pieces corresponding to the damping conductors, and all inner surfaces of the N pieces of magnets may have the same polarity.

A coil groove in which the coil is wound may be formed at an outer side of the lens carrier, and a conductor groove in which the damping conductor is inserted may be formed in the coil groove.

In another embodiment, the magnet comprises: an upper pole magnetized with a first polarity; It may include a lower pole magnetized to a second polarity opposite to the first polarity.

The magnet may further include a gap disposed between the upper pole and the lower pole.

The upper pole may include an upper inner side pole and an upper outer side pole having different polarities, and the lower pole may include a lower inner side pole and a lower outer side pole having different polarities.

The upper inner side pole portion and the lower outer side pole portion may have the same polarity, and the upper outer side pole portion and the lower inner side pole portion may have the same polarity.

The coil may include a first coil corresponding to the upper pole and a second coil corresponding to the lower pole.

The damping conductor is composed of N arranged in all directions, the magnet includes N corresponding to the damping conductor, the upper inner surface poles of the N magnets all have the same polarity, and the lower of the N magnets Both inner side poles may have the same polarity.

A coil groove in which the coil is wound is formed at an outer side of the lens carrier, and a conductor groove in which the damping conductor is inserted is formed in the coil groove, and the coil groove is formed at a corner of the lens carrier. The separator may be divided into an upper groove in which the first coil is wound and a lower groove in which the second coil is wound.

Other aspects, features, and advantages other than those described above will become apparent from the following drawings, claims, and detailed description of the invention.

According to an embodiment of the present invention, the auto-focusing operation time is reduced by reducing the stabilization time during the autofocusing operation of the camera module by reducing the maximum peak value ΔP of the stroke along with the damping effect of the driving IC without using a separate damper bond. There is an effect that can be shortened.

1 is a cross-sectional view of the camera module to which the AF actuator is applied,
2 is a graph relating to a current applied during an autofocusing operation;
3 is a graph showing a response of a driving part according to a change in applied current;
4 is a view for explaining an eddy current;
5 is a view for explaining the damping or braking effect by the eddy current,
6 is a conceptual diagram for applying an eddy current damping effect to an AF actuator,
7 is a graph illustrating a response of a driving part according to a change in applied current;
8 is an exploded view of parts of an AF actuator according to a first embodiment of the present invention;
9 is an assembly view of the AF actuator shown in FIG. 8;
10 is a partial cross-sectional view of the AF actuator shown in FIG. 8, FIG.
11 is a view illustrating a process of winding a lens carrier, a damping conductor, and a coil;
12 is an exploded view of parts of an AF actuator according to a second embodiment of the present invention;
13 is a diagram showing the directions of current, magnetic field, and force in the second embodiment;
14 is an exploded view of parts of an AF actuator according to a third embodiment of the present invention;
15 is an exploded view of parts of an AF actuator according to a fourth embodiment of the present invention;
16 is a view illustrating a process of winding a lens carrier, a damping conductor, and a coil;
Fig. 17 is a diagram showing the directions of current, magnetic field, and force in the fourth embodiment.

As the present invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

When a component is said to be "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may be present in the middle. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

In addition, the components of the embodiments described with reference to the drawings are not limited to the corresponding embodiments, and may be implemented to be included in other embodiments within the scope of the technical idea of the present invention. Although the description is omitted, it is obvious that a plurality of embodiments may be reimplemented into one integrated embodiment.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same or related reference numerals and redundant description thereof will be omitted. In the following description of the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, the terms “… unit”, “… unit”, “… module”, “… unit” described in the specification mean a unit that processes at least one function or operation, which means hardware or software or hardware and software. It can be implemented as a combination of.

4 is a view for explaining the eddy current, Figure 5 is a view for explaining the damping or braking effect by the eddy current, Figure 6 is a conceptual diagram for applying the eddy current damping effect to the AF actuator, Figure 7 is a change in the applied current This is a graph showing the response part of driving part along

In the present invention, an eddy current is used to generate a damping effect. Eddy currents are movements of charges induced inside a conductor by changes in a magnetic field, also called eddy currents and foucault currents.

As shown in FIG. 4, when the conductor 30 adjacent to the magnet 11 moves in the arrow direction (C direction), an induced current I is generated inside the conductor 30.

According to the Fleming's left-hand law, a force (damping force or braking force) is generated in the conductor 30 in a direction opposite to the movement direction of the conductor 30 by the induced current I and the magnetic flux (magnetic field) B. .

Referring to FIG. 5, when a conductor moves in a magnetic flux (magnetic field), a force F is generated in a direction opposite to the direction of movement by the eddy current, which is the magnetic flux density B and the moving speed V of the conductor. Proportional to

Therefore, the faster the moving speed of the conductor, the greater the force to move in the direction opposite to the moving direction, and the greater the effect of damping or braking.

A conceptual diagram for applying such an eddy current damping scheme to an AF actuator is shown in FIG. 6.

Referring to FIG. 6, after the conductor 30 is installed on the outer side of the lens carrier 20, the coil 22 is wound thereon, and the housing includes a magnet (at a position facing the conductor 30 and the coil 22). 11) has a structure arranged.

When a current is applied to the coil 22, the lens carrier 20 is moved by the electromagnetic force generated between the coil 22 and the magnet 11 (moving upward in FIG. 6B). Due to the movement of the lens carrier 20, the conductor 30 is also moved together, and the conductor 30 is moved in the magnetic field by the magnet 11, so that an eddy current is generated and the direction opposite to the moving direction (Fig. 6). In (b), damping (or braking) is achieved by applying force downwardly.

The driving response trajectory of the driving part according to the eddy current damping is shown in FIG. 7.

Compared with the drive response trace shown in FIG. 3, the maximum peak value ΔP of the stroke is significantly reduced, and thus, the stabilization time T2-T0 is also significantly reduced.

Hereinafter, a structure of a camera module including an AF actuator for applying such eddy current damping will be described with reference to related drawings.

FIG. 8 is a partially exploded view of the AF actuator according to the first embodiment of the present invention, FIG. 9 is an assembly view of the AF actuator shown in FIG. 8, and FIG. 10 is a partial cross-sectional view of the AF actuator shown in FIG. 8. 11 is a diagram illustrating a process of winding a lens carrier, a damping conductor, and a coil.

Referring to FIG. 8, the AF actuator 100a according to the first embodiment of the present invention may include a lens 121, a housing 110, an upper spring 114, a magnet 111a, a coil 122, and a lens carrier ( 120, damping conductor 130, lower spring 115, and base 116.

The housing 110 and the base 116 form a basic skeleton of the AF actuator 100a. The housing 110 may be a shield can. The base 116 is a portion mounted on the PCB, and is combined with the housing 110 to form a space portion.

A lens 121 is installed in the lens carrier 120, and a damping conductor 130 is inserted and installed outside the lens carrier 120, and a coil 122 is wound around the lens carrier 120.

Referring to FIG. 11, a coil groove 150 for winding the coil 122 is formed on the outer side of the lens carrier 120 at an intaglio. In the coil groove 150, a conductor groove 160 for inserting and installing the damping conductor 130 is formed in an intaglio. Therefore, the damping conductor 130 is installed in the conductor groove 160, and then the coil 122 is wound in the coil groove 150.

Referring back to FIG. 8, the magnet 111a is installed in the housing 110 and is installed at a position corresponding to the damping conductor 130 installed in the lens carrier 120. Here, the damping conductor 130 and the magnet 111a may be installed in the same quantity (four are illustrated in the figure) so as to correspond to each other 1: 1.

In the present embodiment, each magnet 111a may have one polarity of N pole or S pole.

The upper spring 114 may have an outer side fixed to the housing 110 and an inner side attached to the upper surface of the lens carrier 120. Here, a spacer 117 may be provided between the upper spring 114 and the housing 110 to provide a space for moving the lens carrier 120, that is, the lens 121 up and down.

One end of the lower spring 115 may be fixed to the housing 110 and the other end may be attached to the lower surface of the lens carrier 120.

When a predetermined amount of current is input to the coil 122 wound on the lens carrier 120 for the autofocusing operation in the AF actuator 100a according to the present embodiment, a magnet installed in the coil 122 and the housing 110 may be used. The lens carrier 120 is raised by the electromagnetic force generated between 111a).

In response to the movement of the lens carrier 120, the damping conductor 130 installed in the lens carrier 120 is also moved in the magnetic field by the magnet 111a. In this case, as described above, the eddy current is generated in the damping conductor 130, and the damping force (braking force) caused by the eddy current acts opposite to the moving direction.

Therefore, as shown in FIG. 7, the stabilization time can be shortened when switching from the initial state to the AF state by the eddy current damping effect by the damping conductor 130.

12 is an exploded view of a component of an AF actuator according to a second embodiment of the present invention, and FIG. 13 is a view showing directions of current, magnetic field, and force in the second embodiment.

The AF actuator 100b according to the second embodiment of the present invention has the same components as the AF actuator 100a according to the first embodiment shown in FIG. 8 except for the magnet.

The magnet 111b of the AF actuator 110b according to the second embodiment may be a magnet having a single pole magnet in the horizontal direction and having both polarities (N pole and S pole) based on a vertical boundary line. In this case, the inner side and the outer side have a structure in which only one polarity is magnetized for each side. That is, the polarity of any one of the N pole and the S pole may be magnetized on the inner surface 201 of the magnet, and the other polarity may be magnetized on the outer surface 202.

The damping conductor 130, the coil 122, and the magnet 111b are disposed in the order of the center. Therefore, the portion which generates the magnetic flux (magnetic field) related to autofocusing and eddy current damping is the inner surface 201 of the magnet 111b.

At this time, the polarities magnetized to the inner surface 201 with respect to the plurality of magnets 111b are arranged to be the same. That is, the inner side surfaces 201 of all the magnets 111b can be arranged to be the N pole or to be the S pole.

This is because if some magnets 111b are arranged to have opposite polarities, the electromagnetic forces generated when current is applied to the coils 122 for the autofocusing operation are opposite to each other so that the force for moving the coils 122 is reduced. This is because they can't behave properly by offsetting each other.

FIG. 14 is a partially developed view of an AF actuator according to a third embodiment of the present invention. FIG. 15 is a partially developed view of an AF actuator according to a fourth embodiment of the present invention. FIG. 16 is a winding view of a lens carrier, a damping conductor, and a coil. FIG. 17 is a diagram showing the direction of a current, a magnetic field, and a force in the fourth embodiment.

The AF actuator 100c according to the third embodiment of the present invention and the AF actuator 100d according to the fourth embodiment are compared with the lens carrier 300 when compared with the AF actuator 100a according to the first embodiment shown in FIG. ), There is a difference in the driving part structure including the damping conductor 330, the coil 320, and the magnets 310a and 310b.

The magnet 310a of the AF actuator 100c according to the third exemplary embodiment may be a magnet having a single pole magnet in the vertical direction and having both polarities (N pole and S pole) based on a horizontal boundary line.

The magnet 310a includes an upper pole 311 and a lower pole 312. If necessary, the gap portion 313 may be further included.

The upper pole portion 311 is disposed on the upper side and magnetized to the polarity of any one of the N pole and the S pole, and the lower pole portion 312 is disposed on the lower side and the magnetized to the polarity opposite to the upper pole 311. .

The gap 313 is disposed between the upper pole 311 and the lower pole 312, and is a neutral zone separating the upper pole 311 and the lower pole 312.

The upper pole parts 311 positioned at the upper side with respect to the plurality of magnets 310a may all have the same polarity. That is, the upper poles 311 of all the magnets 310a may be N poles or S poles. In addition, the lower pole portions 312 of all the magnets 310a may also have the same polarity.

If some magnets 310a have the opposite polarity, the electromagnetic force generated when the current is applied to the coil 320 for the autofocusing operation becomes opposite to each other and cancels each other, thereby preventing proper operation. to be.

The magnet 310b of the AF actuator 100d according to the fourth embodiment may also be a bipolar magnet magnet in which both the N pole and the S pole are magnetized on one surface. However, in the fourth embodiment, the magnet 310b may be a double-sided magnet having inner and outer surfaces having different polarities.

The anode magnet magnet 310b includes an upper pole portion 311, a lower pole portion 312, and a void portion 313.

The upper pole 311 is divided into an upper inner pole 311b located on the inner side and an upper outer pole 311a positioned on the outer side, and an upper inner pole 311b and an upper outer pole 311a. Have different polarities.

The lower pole part 312 is also divided into the lower inner side pole part 312b located in the inner side, and the lower outer side pole part 312a located in the outer side, and the lower inner side pole part 312b and the lower outer side pole part 312a. Have different polarities.

Accordingly, the upper inner side pole portion 311b and the lower outer side pole portion 312a have the same polarity, and the upper outer side pole portion 311a and the lower inner side pole portion 312b have the same polarity.

The damping conductor 330, the coil 320, and the magnet 310b are disposed in the order of the center. Therefore, the portions that generate magnetic flux (magnetic field) related to autofocusing and eddy current damping are located on the inner side, and are the upper inner side pole portion 311b and the lower inner side pole portion 312b.

It is possible to have the same polarity for the poles at the same position with respect to the plurality of magnets. That is, the upper inner surface pole portion 311b of all the magnets 310b may be the N pole, and the lower inner surface pole portion 312b may be the S pole.

This means that if some magnets 310b have the opposite polarity, the electromagnetic forces generated when the current is applied to the coil 320 for the autofocusing operation are reversed to each other and cancel each other, thereby preventing proper operation. Because.

The AF actuator 100c according to the third embodiment and the AF actuator 100d according to the fourth embodiment have the lens carrier 300 having the same structure except for the magnet.

Referring to FIG. 16, a damping conductor 330 is inserted and installed at an outer side of the lens carrier 300, and two coils 320 are wound.

To this end, a coil groove 301 accommodating two coils 320 and a conductor groove 306 formed inside the coil groove 301 are formed outside the lens carrier 300.

In the coil groove 301, a coil groove separation unit 304 is installed to separate the coil groove 301 into upper and lower portions at positions corresponding to corner portions of the lens carrier 300.

The coil groove 301 is separated into the upper groove 302 and the lower groove 302 by the coil groove separating part 304, and the first coil 321 is wound around the upper groove 302 and the lower groove 302. ) May cause the second coil 322 to be wound.

The coil groove separator 304 may be partially formed only at the corner portion, thereby eliminating interference with the insertion installation of the damping conductor 330 into the conductor groove 306.

In addition, the first coil 321 and the second coil 322 may be physically separated without contacting each other by the coil groove separator 304.

When the assembly of the AF actuators 100c and 100d is completed, the coil groove separator 304 may correspond to the cavity 313 of the positive electrode magnets 310a and 310b.

The positive electrode magnets 310a and 310b have an upper pole 311 and a lower pole 312 which are divided into upper and lower sides. The first coil 321 wound on the upper groove 302 interacts with the upper pole 311, and the second coil 322 wound on the lower groove 302 interacts with the lower pole 312. .

Referring to FIG. 17, since the upper pole 311 and the lower pole 312 have opposite polarities, currents applied to the first coil 321 and the second coil 322 also flow in opposite directions. For example, a current CI1 flowing in a clockwise direction may be applied to the first coil 321, and a current CI2 flowing in a counterclockwise direction may be applied to the second coil 322.

This is because when the current is applied in the opposite direction, since each coil is placed in magnetic fluxes B1 and B2 opposite to each other, electromagnetic forces F1 and F2 can be generated in the same direction in each coil.

In the present embodiments, when a current is applied to the coil and the lens carrier moves in the optical axis direction, an eddy current is generated in the damping conductor. This eddy current causes the damping conductor to generate a damping force (braking force) in a direction opposite to the moving direction of the lens carrier.

In the present embodiments, it has been assumed that the damping conductor is installed inside the coil wound on the lens carrier. However, it is a matter of course that the damping conductor may be arranged outside the coil.

The outer circumferential surface of the coil may be insulated so that the coil and the damping conductor are not electrically connected to each other.

The damping conductor may be a metal or a plated article disposed to face the corresponding magnet. In addition, the damping conductor is a nonmagnetic material, and may be, for example, copper or an alloy including copper. The thickness of the damping conductor may be 0.01 mm to 0.5 mm. It may also be equal to or smaller than the size (horizontal x vertical) of the facing magnets.

According to embodiments of the present invention, by applying eddy current damping to the AF actuator, the camera module used in the mobile phone or the mobile device reduces the stabilization time when using the autofocusing function or when taking a picture or video, thereby reducing the existing autofocusing function. Compared to the built-in imaging device, the autofocusing function can be implemented quickly, thereby increasing user satisfaction.

In particular, it is possible to realize clear image quality by fast autofocusing operation when moving a subject or changing a subject during video shooting.

Although the above has been described with reference to embodiments of the present invention, those skilled in the art may variously modify the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. And can be changed.

100a, 100b, 100c, 100d: AF actuator
110: housing 114: upper spring
115: lower spring 116: base
117: spacer 111a, 111b: magnet
120: lens carrier 121: lens
122: coil 130: damping conductor
150: coil groove 160: conductor groove
300: lens carrier 310a, 310b: magnet
320: coil 330: damping conductor

Claims (12)

An AF actuator installed in the space of the camera module,
A lens carrier coupled to the inside and vertically moving in the space part;
A damping conductor which is a nonmagnetic material inserted into and installed outside the lens carrier;
A coil wound around the lens carrier provided with the damping conductor; And
A magnet installed in the housing forming the space part and disposed at a position corresponding to the damping conductor,
Coil grooves around which the coil is wound are formed outside the lens carrier,
AF actuators, characterized in that the conductive groove is formed in the coil groove is inserted into the damping conductor.
The method of claim 1,
And the magnet is magnetized with one polarity.
The method of claim 1,
The magnet is AF actuator, characterized in that the inner surface and the outer surface has a different polarity.
The method of claim 3,
The damping conductor is composed of N arranged in all directions,
The magnet includes N pieces corresponding to the damping conductor,
AF actuators, characterized in that all inner surfaces of the N magnets have the same polarity.
delete The method of claim 1,
The magnet includes: an upper pole magnetized to a first polarity; And a lower pole magnetized to a second polarity opposite to the first polarity.
The method of claim 6,
The magnet further comprises an air gap disposed between the upper pole and the lower pole.
The method of claim 7, wherein
The upper pole includes an upper inner side pole and an upper outer side pole having different polarities,
And the lower pole portion includes a lower inner side pole portion and a lower outer side pole portion having different polarities.
The method of claim 8,
The upper inner side pole portion and the lower outer side pole portion have the same polarity with each other,
And the upper outer side pole portion and the lower inner side pole portion have the same polarity with each other.
The method of claim 9,
The damping conductor is composed of N arranged in all directions,
The magnet includes N pieces corresponding to the damping conductor,
And the upper inner surface poles of the N magnets all have the same polarity, and the lower inner surface poles of the N magnets all have the same polarity.
The method of claim 6,
The coil includes a first coil corresponding to the upper pole and a second coil corresponding to the lower pole,
AF actuators, characterized in that for applying the current in the opposite direction to the first coil and the second coil.
The method of claim 11,
And the coil groove is divided into an upper groove in which the first coil is wound and a lower groove in which the second coil is wound by a coil groove separating part installed at an edge portion of the lens carrier.

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