KR20180002433A - Dual optical actuator - Google Patents

Abstract

A dual actuator according to the present invention includes first and second actuators, which each include an AF carrier moving along an optical axis and provided with an AF magnet and an AF driver for moving the AF carrier in an optical axis direction and are disposed to face each other. At least one of the AF magnets provided in the first and second actuators is provided in a direction different from the direction in which the first and second actuators face each other.

Description

DUAL OPTICAL ACTUATOR

The present invention relates to a dual actuator, and more particularly, to a dual actuator arranged in a structure in which magnetic field interference is minimized.

As the hardware technology for image processing has been developed and the user needs for image shooting have increased, there has been an increasing demand for autofocus (AF), etc. in camera modules mounted on mobile terminals such as mobile phones, smart phones, And optical image stabilization (OIS). Recently, a dual actuator connecting two actuators equipped with such AF or OIS functions has been disclosed.

There are various methods of driving the AF and the OIS, but a magnet (or a coil) is mounted on one of a moving object and a fixed object in a relative relationship, and a coil (or a magnet) And the magnet moves the movable body relative to the fixed body by the electromagnetic force generated between the movable body and the magnet.

In general, the optical actuator is generally provided with a magnet on a moving body and a coil on a fixed body in order to improve the reliability of AF and OIS driving and to improve driving precision.

The dual actuator is composed of two independent actuators that are driven by AF or / and OIS by electromagnetic force. Unlike the case of one independent actuator, in the case of a dual actuator having two actuators, S are located at a close distance to each other so that the electromagnetic force generated by one actuator affects the magnetic field configuration of the other actuator and the magnetic field between adjacent magnets affects each other Lt; / RTI >

That is, as shown in FIG. 1, in the case of the conventional dual actuator 70, the magnet 30 provided in one actuator 10 has a distance (distance) close to the magnet 30 provided in the other actuator 11 So that even if a power source of a proper size and direction is applied to the coil 40 by the feedback control by the hall sensor 50, the carrier 20 (lens mounted) is intended There arises a problem that the carrier 20 does not move to the correct position.

In order to precisely drive the AF or OIS accurately, the horizontality of the carrier 20 on which the lens is mounted must be maintained at all times, but the mutual influence due to the electromagnetic force generated between the magnets or other actuators, Tilting is generated in the carrier 20 and the efficiency of precise control is lowered.

Conventionally, when the dual actuator 70 is implemented without consciousness of such a problem, since independent actuators are connected in parallel and used, the precision control performance deterioration due to the deterioration of the driving performance of the AF or OIS, the tilt failure of the carrier, etc. A problem occurs.

SUMMARY OF THE INVENTION The present invention has been devised to solve the above-described problems in the background as described above, and it is an object of the present invention to provide a dual actuator, in which an electromagnetic field structure related to AF or OIS driving is arranged in a direction other than a surface portion facing two actuators, The present invention aims at implementing a dual actuator capable of optimizing independent AF or OIS drive of each actuator by minimizing the influence of a magnetic field or the like.

Other objects and advantages of the present invention will become apparent from the following description, and it will be apparent from the description of the embodiments of the present invention. Further, the objects and advantages of the present invention can be realized by a combination of the constitution shown in the claims and the constitution thereof.

According to an aspect of the present invention, there is provided a dual actuator comprising: an AF carrier moving along an optical axis and having an AF magnet; and an AF driver for moving the AF carrier in an optical axis direction, And at least one of the AF magnets provided in the first and second actuators is arranged in a direction different from a direction in which the first and second actuators face each other.

Here, the AF driver of the present invention may include an AF coil installed in a direction facing the AF magnet and generating an electromagnetic force in the AF magnet.

In addition, at least one of the first or second actuators of the present invention includes an OIS carrier having an OIS magnet in each of two perpendicular directions and moving in a direction perpendicular to the optical axis, and the first actuator or the second actuator At least one of the two actuators is provided with an OIS coil for generating an electromagnetic force in its own OIS magnet, and at least one of the OIS magnets provided in the first and second actuators has a direction in which the first and second actuators face each other And can be configured to be provided in different directions.

Preferably, at least one of the AF magnets of the first and second actuators of the present invention is provided on one side of the actuator, and in this case, the OIS magnet is positioned in the corner area opposite to the position where the AF magnet of the actuator is provided .

In addition, it is preferable that at least one of the AF magnets of the first and second actuators of the present invention is positioned in a corner area portion of the actuator.

The dual actuator according to another aspect of the present invention includes an OIS carrier that moves in a direction perpendicular to an optical axis and includes an OIS magnet and an OIS driver that moves the OIS carrier in a direction perpendicular to the optical axis, Wherein at least one of the OIS magnets provided in the first and second actuators is provided in a direction different from a direction in which the first and second actuators face each other.

According to a preferred embodiment of the present invention, the electromagnetic field configuration for AF or OIS driving is provided in a direction that does not face each other, thereby minimizing the mutual influence due to the electromagnetic force generated between the individual actuators or the magnetic field of the magnet, It is possible to provide the effect of optimizing each independent AF or OIS drive.

The magnetic force between the magnets provided in the adjacent individual actuators is minimized so that the horizontality of the AF carrier or the OIS carrier on which the lens is mounted is constantly maintained to prevent the problems caused by the tilt failure .

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate preferred embodiments of the invention and, together with the description of the invention given below, serve to better understand the technical idea of the invention, And shall not be construed as limited to such matters.
1 is a view showing a structure of a conventional dual actuator,
2 is an exploded view showing a structure of an actuator according to a preferred embodiment of the present invention,
FIG. 3 is a view showing a configuration of a dual actuator according to a preferred embodiment of the present invention constructed by the actuator shown in FIG. 2;
FIG. 4 is an exploded view showing a configuration of an actuator according to another preferred embodiment of the present invention,
FIG. 5 is a view showing a configuration of a dual actuator according to another preferred embodiment of the present invention constructed by the actuator shown in FIG. 4;
6 is an exploded view showing the structure of an actuator according to another preferred embodiment of the present invention,
FIG. 7 is a view showing a configuration of a dual actuator according to another preferred embodiment of the present invention constructed by the actuator shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents It should be understood that water and variations may be present.

2 is an exploded view showing the structure of an individual actuator 100 according to a preferred embodiment of the present invention.

The actuator 100 of the present invention shown in FIG. 2 is an individual actuator that constitutes the dual actuator 1000 of the present invention. As shown in the figure, the actuator 100 of the present invention includes an AF carrier 110, A main frame 120, an AF coil 121, a yoke 125, and a plurality of balls 130. As shown in FIG.

The AF magnet 111 for driving the AF is provided in the AF carrier 110 and a back yoke (not shown) for concentrating the magnetic force may be further provided on the rear surface of the AF magnet 111. [ The AF carrier 110 shown in the figure corresponds to a configuration corresponding to a moving body of the AF driving and is configured to move in the direction of the optical axis by the electromagnetic force generated by the AF driving unit, that is, the AF coil 121. [

In the actuator 100 in which only the AF function is solely implemented, a lens (not shown) is mounted on the AF carrier 110 and the AF carrier 110 is physically moved together with the AF carrier 110, As the lens moves, the lens is also moved in the direction of the optical axis (Z-axis direction), and the distance from the image sensor through the movement is adjusted to realize the auto focus function.

In the embodiment in which the AF function and the OIS function are integrated, it is possible to mount the AF carrier 110 or the AF carrier 110 and to move in the X and Y axis directions perpendicular to the optical axis direction Z An OIS carrier 200 for driving the OIS may be further included.

In this case, according to the embodiment, the lens (or the lens assembly) can be mounted in the mounting space 205 of the OIS carrier 200. When the AF carrier 110 moves in the optical axis direction, The focus is adjusted by moving the lens in the direction of the optical axis, and when the OIS driving for correcting the shaking motion is performed, the OIS carrier 200 moves in a direction perpendicular to the optical axis direction from above the AF carrier 110 And the movement of the lens barrel is compensated for by the movement of the lens barrel.

The dual actuator 1000 of the present invention has a configuration in which the individual actuators 100 constituting the dual actuator 1000 are constructed so as to minimize the magnetic field influence and interference between the individual actuators 100, , An apparatus in which an OIS function is implemented singly, or an apparatus in which an AF and an OIS are integrated, as a matter of course, and a different type of apparatus can be implemented as a dual actuator by selective combination.

The main frame 120 of the present invention corresponds to the AF carrier 110 and the main frame 120 corresponds to a fixed body from the viewpoint that the AF carrier 110 is a moving body for AF driving.

The main frame 120 may be provided with a configuration for driving the AF, that is, an AF coil 121, an FPCB 123, a yoke 125, a hall sensor 127, and a drive chip 128. The AF driver for driving the AF generates an electromagnetic force corresponding to the magnitude and direction of the power applied from the outside, thereby moving the AF carrier 110 equipped with the AF magnet 111 in the optical axis direction.

The hall sensor 127 senses the position of the AF magnet 111 (i.e., the position of the AF carrier, that is, the position of the lens) by using a Hall effect and outputs a signal corresponding thereto to the drive chip 128 And the drive chip 128 controls the power source of the appropriate size and direction to be applied to the AF coil 121 side by using the signal of the input Hall sensor 127.

By this method, the auto focus function is implemented by feedback-controlling the exact position of the lens with reference to the direction of the optical axis. The AF coil 121, the drive chip 128 and the hall sensor 127 may be mounted on an FPCB 123 connected to an external module, a power supply unit, a device, or the like.

The main frame 120 may be divided into a second sub-frame 120-1 and a second main frame 120-2 as shown in FIG. 3, or may be implemented as a single unified object .

2, a plurality of balls 130 arranged in a direction corresponding to the optical axis direction are disposed between the AF carrier 110 and the main frame 120 (the second sub-frame 120-1) The AF carrier 110 and the main frame 120 are spaced apart from each other by a distance corresponding to the diameter of the ball.

The main frame 120 is provided with an AF (automatic focus) provided in the AF carrier 110 so that the AF carrier 110 and the main frame 120 maintain proper spacing and point contact of the AF carrier 110 with respect to the ball is maintained. A magnet 111 and a yoke 125 for generating attractive force are provided.

2, a ball means 230 may be interposed between the AF carrier 110 and the OIS carrier 200, and a point contact with the ball means 230 may be provided between the AF carrier 110 and the OIS carrier 200, The OIS carrier 200 is flexibly moved in a direction perpendicular to the optical axis with a minimized frictional force.

Since the camera-shake compensation is performed in a direction perpendicular to the optical axis, the OIS carrier 200 of the present invention is provided with the OIS magnet 210 in each of the directions orthogonal to the optical axis and in mutually orthogonal directions. The OIS magnet 210 receives a force in a direction perpendicular to the optical axis due to an electromagnetic force with the OIS coil 220 mounted on the main frame 120. The OIS magnet 210 receives an OIS carrier 210 200 move in a combined direction perpendicular to the optical axis.

As described above, in the embodiment in which the AF and the OIS are integrated, the lens can be mounted on the OIS carrier 200. Therefore, the lens (lens assembly) can be mounted on the OIS carrier 200 by the movement in the direction perpendicular to the optical axis direction of the OIS carrier 200, The movement in the same direction also overcomes the phenomenon of image blur due to hand movement.

FIG. 3 is a diagram illustrating a configuration of a dual actuator 1000 according to an exemplary embodiment of the present invention, which is configured by the actuator 200 of the present invention shown in FIG.

3, the dual actuator 1000 of the present invention includes a first actuator 100 and a second actuator 500. As shown in the drawing, the first actuator 100 and the second actuator 500 2 actuators 500 are configured to face each other with reference to a specific surface direction S.

At this time, at least one of the AF magnet 111 provided in the first actuator 100 and the AF magnet 111 provided in the second actuator 500 is positioned at a position where the first and second actuators 100, In the direction different from the direction S of the surface portion.

In this arrangement, the magnetic fields formed by the AF magnets 111 do not interfere with each other, so that the influence of the magnetic force exerted between the AF magnets 111 can be minimized, and the individual actuators 100, Independent AF driving is performed.

The AF coil 121 for generating an electromagnetic force in the AF magnet 111 is provided in a direction opposite to the AF magnet 111 so that the AF magnet 111 provided in each actuator 100, The AF coils 121 of the actuators 100 and 500 are also arranged in a direction different from the direction in which the first and second actuators 100 and 500 face each other As shown in Fig.

When the individual actuators 100 constituting the dual actuator 1000 according to the embodiment of the present invention are actuators having only a single AF function, the AF magnets 111 provided in the respective actuators are the same as the example shown in Fig. 3 May be arranged in a direction to combine each of the three directions, which are directions other than the direction S facing the actuators 100, 500,

3, the AF magnet 111 is positioned on the left side surface of the first actuator 100 and the second actuator 500 is disposed on the right side surface of the second actuator 500 The AF magnet 111 may be located at a position where the AF magnet 111 is located.

When the AF coil 121 is implemented in a coiled form, the AF magnet 111 and the second actuator 500 of the first actuator 100 are combined with the magnetic field region formed by the AF coil, The AF magnets 111 may be arranged at the upper, lower, lower, and upper positions, respectively.

3 illustrates an actuator in which individual actuators 100 are integrated with AF and OIS driving. However, in the embodiment shown in FIG. 3, the individual actuators 100 constituting the dual actuator 1000 Only the OIS function may be an actuator implemented solely. In this case, at least one of the OIS magnets 210 provided in the first actuator 100 or the second actuator 500 is different from the direction S in which the first and second actuators 100 and 500 face each other Direction.

3, when the dual actuator 1000 of the present invention is implemented by the actuator 100 in which the AF and the OIS are integrated, the AF magnet 111, as well as the OIS magnet 210, The AF magnet 111 is provided on one side of the four sides of the actuators 100 and 500 other than the facing direction S so that the influence of the magnetic field between the actuators 100 and 500 can be minimized. It is preferable that the magnet 111 is located in a corner area opposite to the position where the magnet 111 is provided.

The AF magnet 111 of the first actuator 100 is disposed in the downward direction of the drawing and the AF magnet 111 of the second actuator 500 is disposed in the upper direction of the drawing according to the embodiment .

In this case, it is preferable that the OIS magnet 210 is provided in a direction perpendicular to the OIS carriers 200 so that the OIS carriers 200 can move in a direction orthogonal to the OIS carriers 200 and a combined direction thereof.

Although the embodiment of the present invention shown in the drawings illustrates one example of implementing the technical idea of the present invention, the actuators 100 and 500 constituting the dual actuator 1000 of the present invention Two types of actuators, that is, an actuator having only AF, an actuator having only OIS, or an actuator having both AF and OIS can be combined, and two actuators of the same type having the same function can be combined Of course it is possible.

FIG. 4 is a view showing a configuration of an actuator according to another preferred embodiment of the present invention, and FIG. 5 is a view showing a dual actuator 1000 formed by the actuators 100 and 500 shown in FIG.

The actuator 100 of the present invention shown in Fig. 4 is configured such that the AF magnet 111 and the AF coil 121 are positioned in the corner area of the actuator 100, And the functions of the configurations are substantially the same as the embodiment shown in Fig.

Even when the actuators 100 and 500 according to the embodiment of the present invention shown in FIG. 4 are disposed to be implemented by the dual actuator 1000, the OIS magnet 210 as well as the AF magnet 111 can be driven by the two actuators 100, 500 are spaced as far as possible in the direction S facing each other.

FIG. 6 is a view showing a configuration of an actuator according to another preferred embodiment of the present invention, and FIG. 7 is a view showing a dual actuator 1000 formed by the actuators 100 and 500 shown in FIG. 6 .

6 includes a structure in which the OIS carrier 210 is supported by the wire 250. The OIS carrier 210 is elastically supported by the wire 250 so as to compensate for camera shake Movement by compensation, compensation movement and in-situ restoration are performed.

In the embodiment shown in FIG. 6, an OIS coil 220 for OIS driving is provided on the bottom of the corner portion. The OIS magnet 210 is provided on the OIS carrier 200, 220 facing each other.

The AF carrier 110 is positioned inside the OIS carrier 200 and the AF carrier 110 provided with the AF magnet 111 by the feedback control of the AF coil 121 and the driving driver 128 And linearly moves in the direction of the optical axis to realize autofocus.

6, when the dual actuator 1000 is implemented by the actuator 100 of the present invention shown in FIG. 6, the AF magnet 100 (or 111) is mounted in the direction S in which the two actuators 100 and 500 face each other. ) Is not located.

The embodiments of the present invention shown in FIGS. 2 to 7 are characterized in that the electromagnetic field structures for AF or OIS driving are not disposed on all four sides of the actuator 100 which forms a quadrangular shape as a whole.

Even if the two actuators 100 are adjacent to each other so that the electromagnetic system components for driving the AF or the OIS are not disposed on all four sides as described above, the configuration of the electromagnetic system can be realized by the two individual actuators 100 And 500 may not be disposed in the facing surface direction S, thereby minimizing magnetic interference or influence between the individual actuators 100 and 500.

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 details thereof and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

In the above description of the present invention, the first and second modifiers are merely terms of a tool concept used for relatively separating the components of each other, so that they are used to indicate a specific order, priority, etc. It should be interpreted that it is not a terminology.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It should be understood that various modifications may be made in the ordinary skill in the art.

1000: Dual actuator
100: actuator (first actuator) 500: second actuator
110: AF carrier 111: AF magnet
120: main frame 121: AF coil
123: FPCB 125: York
127: Hall sensor 128: Drive chip
130: Ball 200: OIS carrier
210: OIS magnet 220: OIS coil
230: means for viewing

Claims (6)

An AF carrier moving along an optical axis and having an AF magnet, and an AF driver for moving the AF carrier in an optical axis direction, the first and second actuators being disposed to face each other,
Wherein at least one of the AF magnets provided in the first and second actuators is provided in a direction different from a direction in which the first and second actuators face each other. 2. The image pickup apparatus according to claim 1,
And an AF coil installed in a direction facing the AF magnet and generating an electromagnetic force in the AF magnet. 3. The apparatus of claim 2, wherein at least one of the first or second actuators comprises:
An OIS carrier having an OIS magnet in each of two perpendicular directions and moving in a direction perpendicular to the optical axis,
Wherein at least one of the first actuator and the second actuator is provided with an OIS coil for generating an electromagnetic force in its own OIS magnet,
Wherein at least one of the OIS magnets provided in the first and second actuators is provided in a direction different from a direction in which the first and second actuators face each other. 4. The apparatus of claim 3, wherein at least one of the AF magnets of the first and second actuators comprises:
The actuator being provided on one side of the actuator,
Wherein the OIS magnet is located in a corner area opposite to a position where the AF magnet of the actuator is provided. 4. The actuator according to any one of claims 1 to 3, wherein at least one of the AF magnets of the first and second actuators comprises:
Wherein the actuator is located in an edge area portion of the actuator. An OIS carrier moving in a direction perpendicular to the optical axis and having an OIS magnet and an OIS driver for moving the OIS carrier in a direction perpendicular to the optical axis, the first and second actuators being disposed to face each other,
Wherein at least one of the OIS magnets provided in the first and second actuators is provided in a direction different from a direction in which the first and second actuators face each other.

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