WO2017105010A1

WO2017105010A1 - Optical actuator

Info

Publication number: WO2017105010A1
Application number: PCT/KR2016/014023
Authority: WO
Inventors: 설진수; 이병철; 고재용; 박병찬
Original assignee: 자화전자 주식회사
Priority date: 2015-12-15
Filing date: 2016-12-01
Publication date: 2017-06-22
Also published as: KR20170071097A

Abstract

An optical actuator according to the present invention comprises: an AF carrier which moves in the direction of an optical axis; an OIS carrier which moves in a direction perpendicular to the optical axis and on which the AF carrier is mounted; a housing in which the OIS carrier is accommodated; and an erecting type elastic body of which one end is connected to the OIS carrier and the other end is connected to a base of the housing.

Description

Optical Actuator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator for a camera module mounted on a portable terminal, and more particularly, to an integrated actuator for optics that implements an autofocus function and a hand shake correction function as a single actuator.

As hardware technology for image processing has advanced and user needs for image capturing have increased, auto focus (AF), as well as independent camera devices, camera modules mounted on mobile terminals such as mobile phones, smartphones, etc. Stabilization and other functions are being implemented.

The autofocusing function refers to a function of generating a clear image in the image sensor provided at the rear end of the lens by adjusting the focal length with the subject by linearly moving the lens assembly in the optical axis direction.

In addition, the image stabilization function refers to a function of correcting a phenomenon in which an image is disturbed or blurred due to an environment such as vibration or shake, such as a user's hand shake, affecting the sharpness (sharpness) of an image. The technique of physically correcting the position is called Optical Image Stabilization (OIS).

In the case of a camera module mounted on a smart phone, the mobility of the terminal itself is large, and hand and arm tremors generated in the human body can be easily transmitted to the camera module. It can be said that it is relatively more frequent when the shooting environment is not fixed, such as photographing the image of the holder himself / herself.

Therefore, in a camera module mounted on a smartphone, image blur due to vibration or vibration according to the shooting environment becomes larger, and thus necessity of image correction is greater.

Conventional techniques for image correction due to camera shake (OIS) arrange a coil in a stationary body (housing, etc.), and place a magnetic body facing each other in a movable body (OIS carrier, etc.) to form a magnetic circuit, and generate by a coil. By the electromagnetic force, the magnetic material, that is, the moving body provided with the magnetic material is configured to move in a combined direction of two directions of a plane perpendicular to the optical axis direction, so that correction corresponding to hand shaking is implemented.

In the related arts, as described in Korean Patent Application Laid-Open No. 10-2015-0054719 and Korean Patent Application Laid-Open No. 10-2012-0097122, the moving body and the high body are used to implement the flow of the moving body and restore the moving body to its original reference position. A method of connecting stagnation with a suspension wire is used.

However, the suspension wire may cause problems such as bending or breaking due to external shock or vibration, and since the suspension wire is formed in the form of a thin wire, there is a problem in that the stiffness is easily changed when used for a long period of time.

In addition, in the assembling process of connecting the stationary body and the movable body with the suspension wire, the movable body must be spaced apart or floated from the fixed body, and thus, a separate dedicated jig for maintaining the state and performing the assembly process. May have the disadvantage that the process efficiency is low and the assembly process takes considerable time.

Furthermore, in this prior art, the process of maintaining the floating state of the moving body and the complex process of joining at least four or more suspension wires together must be performed, so that the alignment of the moving body (OIS carrier) to the exact horizontal balance is difficult, so the tilt of the moving body is difficult. The failure rate is likely to occur.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Korea Patent Publication No. 2015-0054719 (2015.05.20)

(Patent Document 2) Korean Patent Publication No. 2012-0097122 (2012.09.03)

The present invention was devised to solve the above problems in the background as described above, by implementing a structure for the flow of the OIS carrier (removable body) and the restoration to the original position in the shape of the elastic form, as well as improving the efficiency of the assembly process The aim is to provide an optical actuator that can more effectively implement OIS driving and further improve product reliability and durability.

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the configuration shown in the claims and combinations thereof.

Optical actuator of the present invention for achieving the above object is an AF carrier moving in the optical axis direction; An OIS carrier moving in the vertical direction of the optical axis and mounted with the AF carrier; A housing in which the OIS carrier is accommodated; And one end is connected to the OIS carrier, the other end may be configured to include a standing-type elastic body connected to the base of the housing.

Wherein the elastic body of the present invention is more preferably implemented as a coil spring.

In addition, the OIS carrier or the base of the housing of the present invention may be configured to include a protrusion support to which the coil spring is fitted, in this case is provided inside the coil spring, the first protrusion provided in the OIS carrier It is preferable to comprise so that the lower surface of the support and the ball facing the upper surface of the second protrusion support provided on the base of the housing.

In order to implement another preferred embodiment of the present invention, the first protrusion support provided in the OIS carrier and the second protrusion support provided in the base of the housing may be configured to face each other, the first and second protrusion support It is more preferable that one end of each of the ends to be treated has a rounded shape.

In addition, the OIS carrier of the present invention is provided with an OIS magnet, in which case the housing of the present invention is provided in a direction opposite to the OIS magnet OIS coil for generating an electromagnetic force on the OIS magnet; And it may be configured to include a sensor for sensing the position of the OIS carrier.

More preferably, the AF carrier of the present invention may be provided with an AF magnet, and in this case, the OIS carrier may be provided in a direction opposite to the AF magnet, and may be provided with an AF coil for generating electromagnetic force in the AF magnet.

In order to implement a more preferred embodiment, the housing of the present invention may further include a first plate provided on the base and electrically connected to an external power source, in which case the OIS carrier of the present invention is electrically connected with the AF coil. Further comprising a second plate, wherein the coil spring is made of a conductive material and is configured to electrically connect the first plate and the second plate.

In this case, the housing of the present invention may further include a first plate provided on the base and electrically connected to an external power source or an external AF control unit, in which case the OIS carrier senses the position of the AF carrier. A second sensor; And a second plate electrically connected to the AF coil or the hall sensor, and the coil spring made of the conductive material may be configured to electrically connect the first plate and the second plate.

Preferably, the optical actuator of the present invention comprises: an AF carrier moving in the optical axis direction; An OIS carrier moving in the vertical direction of the optical axis and mounted with the AF carrier; A housing in which the OIS carrier is accommodated; A protruding support provided on at least one of the OIS carrier or the base of the housing and protruding in the optical axis direction; And a coil spring coupled to the protruding support and connected to the base of the OIS carrier and the housing.

Optical actuator according to an embodiment of the present invention by using the elastic body having a shape that can be installed in itself to physically support the relative flow due to vibration, shaking, etc. of the OIS carrier (moving body), as well as restore to the original position Since the alignment is elastically implemented, it can have more robust characteristics such as dropping and impact, thereby creating an effect of dramatically increasing durability and reliability.

In addition, the OIS carrier can be directly coupled or seated on the housing (fixed body) in parts-to-parts, which eliminates the need for a dedicated jig or the like, thereby increasing process efficiency and horizontally aligning the OIS carrier. It can be implemented more effectively can provide an advantage that can dramatically lower the tilt failure rate of the moving object.

Furthermore, according to another preferred embodiment of the present invention, a structure or a hole for applying an external power source to the AF coil provided inside the OIS carrier using only a simple structure that is organically coupled with the elastic material of the conductive material for the function of the OIS. By implementing an electrical connection for interfacing with the sensor, it is possible to provide an actuator having a structure optimized for miniaturization and light weight of the device.

In addition, according to another preferred embodiment of the present invention, the OIS carrier can be configured to be point-contacted with the ball means and the point contact can be maintained through the attraction between the magnet and the yoke. In-plane movement and position control of the OIS carrier can be implemented more accurately and effectively, and the carrier on which the lens is mounted can be more effectively induced to return to the original position.

The following drawings, which are attached to this specification, illustrate exemplary embodiments of the present invention, and together with the detailed description of the present invention, which serve to more effectively understand the technical spirit of the present invention, the present invention is described in these drawings. It should not be construed as limited to matters.

1 is an exploded coupling diagram showing a detailed configuration and coupling relationship of an optical actuator according to a preferred embodiment of the present invention;

2 is a view showing a detailed configuration of the OIS carrier and the housing and their coupling relationship,

3 is a view illustrating an elastic body of a standing-type form of the present invention and an OIS carrier coupled thereto;

Figure 4 is a view showing various embodiments of the standing body of the elastic body and the protrusion support of the present invention,

5 illustrates an AF carrier and related configuration according to an embodiment of the present invention;

Fig. 6 is a diagram showing a preferred embodiment of the present invention showing an application structure of a power supply for AF driving.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various equivalents that may be substituted for them at the time of the present application It should be understood that there may be water and variations.

The optical actuator (hereinafter, referred to as 'actuator') 1000 of the present invention is an actuator in which the auto focus function and the image stabilization function are implemented. As shown in FIG. 1 and the like, the AF carrier 100 and the OIS carrier 200 are shown. , And the housing 300 and the elastic body 400, and may include a shield can 500 coupled to an upper portion of the housing 300 in which the inner space is formed to perform a function such as insulation between the case and the outside. have.

The actuator 1000 of the present invention is provided with a circuit board (flexible circuit board (FPCB)) 350 on the side of the housing 300, as shown in Figure 1, etc., the power for driving the OIS from the outside is applied, Since a signal or data input / output or the like is performed with another configuration of a device (such as a smartphone) on which the actuator 1000 of the present invention is mounted or with a drive chip for position feedback control by the hall sensor 197, power, signal, data, etc. The terminal 351 of the FPCB 350 is preferably implemented to be exposed to the outside of the housing 300 for effective interfacing.

As shown in the drawing, the Z axis refers to the direction in which the lens is moved forward or backward for focusing, etc., and the X axis and the Y axis are in the plane perpendicular to the optical axis. Means both axes. In the following description, the first direction and the second direction mean directions perpendicular to each other as both axis directions on the X-Y plane perpendicular to the optical axis.

The AF carrier 100 of the present invention linearly moving in the optical axis direction is provided with a mounting space 110 in the center portion, the lens assembly (not shown) is coupled to the mounting space 110, as seen by such a combination The AF carrier 100 of the present invention is to move the lens assembly and the physical movement together. The AF carrier 100 and the AF driving will be described later.

The OIS carrier 200 according to the present invention accommodates the AF carrier 100 and has a first direction (X axis direction) or a second direction (a plane formed by the X axis and the Y axis) perpendicular to the optical axis. In the direction of a combination of the Y-axis direction).

The OIS carrier 200 may form various shapes as a whole, but the movement of the position due to the shaking and the position correction thereof are made in both directions perpendicular to each other on the basis of the XY plane, so that the OIS carrier 200 has a rectangular shape as a whole. desirable.

In the housing 300 of the present invention, an inner space is formed at a center portion, and the inner space is a space in which the OIS carrier 200 is mounted and the OIS carrier 200 is shaken or vibrated in a first direction or a second direction. It provides a moving space to move in the direction.

As shown in FIG. 1 and the like, the elastic body 400 of the present invention is connected to the base 370 side of the housing 300 and the other end is connected to the OIS carrier 200 to fix the housing 300. The point is to elastically support the flow, movement, correction movement, home position restoration movement, etc. of the OIS carrier 200. In the description of the present invention, the base 370 of the housing 300 means an inner bottom portion of the housing.

2 is a diagram illustrating a detailed configuration of the OIS carrier and the housing and a coupling relationship thereof. As shown in FIG. 2, the housing 300 includes an OIS coil 320 and a hall sensor 330.

The OIS coil 320 generates an electromagnetic force corresponding to the magnitude and direction of the power applied from the outside, and when the electromagnetic force is transmitted to the OIS magnet 220 provided in the OIS carrier 200, the OIS coil 320 is applied to the magnitude and direction of the generated electromagnetic force. The OIS carrier 200 is moved by this.

The hall sensor 330 senses the position of the OIS carrier 200 based on the first and second directions using a hall effect and outputs the sensing value. Although the Hall sensor 330 is located in the center portion of the OIS coil 320 in the drawing, it may be located in the base portion of the housing 300 according to the embodiment, and the yoke 340 to be described below is dualized. It may be configured to be located in the portion in between.

The drive module or chip (not shown), which may be provided externally, controls the power supply (size and direction) to be applied to the OIS coil 320 when a sensing value is input from the hall sensor 330.

As described above, the actuator 1000 of the present invention recognizes the position value of the Hall sensor 330, applies power corresponding to the position value, generates electromagnetic force by the applied power, and generates a magnet (OIS carrier) 200 by the generated electromagnetic force. Since the movement process is configured to be feedback-controlled through the cyclic processing, the correction due to the shaking of the OIS carrier 200 can be accurately and precisely performed.

As described above, since the hand shake correction is performed in a combined direction of the first direction and the second direction, the Hall sensor 330 is provided in each of the first and second directions as shown in FIGS. 1 and 2. Preferably, the OIS coil 320 and the OIS magnet 220 are also preferably provided in each of the first and second directions.

Since the OIS carrier 200 may move in the first and second directions, the OIS coil 320 and the OIS magnet 220 may be provided one by one in the first and second directions. The OIS magnet 220 and the OIS coil 320 may be provided in plurality so as to be symmetrical with respect to each of the first direction and the second direction in order to implement load balance and position control more quickly and precisely.

In addition, the OIS coil 320 corresponding to one OIS magnet 220 may be divided into plural, and correspondingly, the OIS magnet 220 corresponding to one OIS coil 320 may be divided into plural.

Meanwhile, a back yoke (not shown) may be further provided on the rear surface of the OIS magnet 220, that is, in the opposite direction of the coil, to prevent external leakage of magnetic force and to concentrate magnetic force.

As shown in FIG. 2, the elastic body 400 of the present invention has one end connected to the housing 300 base 370 side, and the other end connected to the OIS carrier 200 side to fix the housing 300 to the fixed end. As such, the OIS carrier 200 elastically supports movement, correction movement, and position restoration movement.

As shown in the figure, the elastic body 400 of the present invention has a shape of being vertically placed in the vertical direction (optical axis direction), the lower part of which is on the base 370 side of the housing 300, and the upper part of the OIS carrier 200. It is connected to the lower part or the side lower part. Unlike the conventional wire spring, the elastic body 400 of the present invention is embodied in a form (such as a cylinder) in which the elastic body can be placed.

As described above, since the elastic body 400 of the present invention is vertically placed, that is, has a standing shape, the elastic body 400 is coupled to the housing 300 side, and then the OIS carrier 200 is lowered from the top of the housing 300. Since the assembly process can be performed by only a simple operation of seating on the upper portion of the elastic body 400 in the direction, there is no need for a special dedicated jig for maintaining the floating of the OIS carrier 200 like the conventional wire type actuator. The assembly process can be made simpler.

In addition, when the elastic body 400 as described above is provided at three or more different positions as in each corner direction, the OIS carrier may be simply mounted on the elastic body 400 having the same height as it is. It is possible to accurately implement the horizontal balance of the (200) can minimize the defect rate of tilt (tilt) of the OIS carrier 200.

Hereinafter will be described in more detail the configuration for the elastic body 400 of the present invention.

As described above, the elastic body 400 of the present invention is an elastic body having a shape in which the movement, correction movement, restoration movement, etc. of the OIS carrier 200 can be elastically supported based on the housing 300. It can be implemented in shape and material.

The elastic body 400 of the present invention may be implemented in the form of connecting the lower surface of the OIS carrier 200 and the upper portion of the base (bottom) of the housing 300, further increases the space utilization of the actuator 1000, the actuator 1000 As shown in the figure, the space of the lower part is opened in the corner portion of the OIS carrier 200 to realize the miniaturization of the volume to the height) and the more flexible movement of the OIS carrier 200. It is preferable to configure so that the elastic body 400 is located in this space.

In addition, the lower surface of the OIS carrier 200 and the bottom surface of the housing 300 so as not to be in contact with the housing 300 in order to allow the movement, correction movement, restoring movement, etc. due to vibration of the OIS carrier 200 to be made flexibly without friction. It may be said that it is desirable to maintain a state spaced a predetermined distance.

Therefore, the height of the OIS carrier 200, the height of the edge portion of the OIS carrier 200 to which the elastic body 400 is connected, the separation distance between the housing 300 base 370 and the OIS carrier 200, the maximum shrinkage of the elastic body It is preferable to implement the elastic body 400 in consideration of the height of the city comprehensively.

The elastic body 400 of the present invention can be maintained in a standing state and can be implemented as a polymer material if compression / extension is possible, as well as in the form of a coil spring.

When the elastic body 400 is implemented as an elastic polymer material, it is preferable to implement the structure having a columnar shape or a hollow columnar shape having a hollow part in the middle so that the shape of the standing can be effectively maintained. It is preferable to implement the diameter of the center portion smaller than the end so that the movement of the carrier 200 is made more flexible.

It is preferable that the elastic body 400 of the present invention be implemented as a coil spring. In this case, when the coil spring is fully contracted, the elastic spring 400 will have the height of the coil spring itself, which is no longer contracted. And the coil spring having characteristics (length, size, etc.) in which the gap size between the OIS carrier 200 and the housing is considered.

The coil spring may be made of a metal material, of course, may also be implemented in a material such as plastic, and to implement a coil spring made of a conductive metal material to implement a structure for the internal application of an external power source, as described below. desirable.

When the elastic body 400 of the present invention is implemented by using a coil spring or a cylindrical polymer material of plastic material, external power is applied using a method of applying conductive resin or fluid to the elastic body 400. Can be implemented.

Hereinafter, an embodiment in which the movement, correction movement, and restoration movement of the OIS carrier 200 will be more flexibly implemented will be described in detail.

As shown in FIGS. 2 to 4, the base of the OIS carrier 200 and the housing 300 according to the present invention includes an elastic body 400 as described above, that is, a protrusion support 210 into which the coil spring 400 is fitted. 310 may be provided.

For convenience of description, the protruding support part provided in the OIS carrier 200 is provided by the first protruding support part 210, and the protruding support part provided in the lower part (base) of the housing 300 is supported by the second protruding support part 310.

The protrusion support (210, 310) is basically an elastic body, that is, when the coil spring 400 is connected to the OIS carrier 200 and the housing 300 performs a guiding function to facilitate the connection is made to the coil The assembly process of the spring 400 can be guided more easily and accurately.

In addition, the protruding supports 210 and 310 have the diameter of the coil spring 400 at the end as shown in the drawing so as to effectively maintain the fitted state of the coil spring 400 and to easily induce elastic deformation of the coil spring. And to correspond to, the middle portion is preferably implemented to be smaller than the diameter of the coil spring (400).

Meanwhile, as illustrated in FIGS. 2 and 3, the housing 300 and the base 370 are provided at positions corresponding to the OIS magnet 220 provided in the OIS carrier 200 to generate an attraction force with the OIS magnet 220. A yoke 340 may be provided.

The yoke 340 is made of a magnetic material such as a metal to generate an attraction between the OIS magnet 220 and the OIS carrier 200 is not separated to the outside by the generated attraction, and the movement, correction of the OIS carrier 200 After the movement, etc., the OIS carrier 200 is induced to be restored to its original position.

In the case where it cannot be aligned in a symmetrical structure due to the positional and geometrical features of the OIS carrier or AF carrier, the required number of yokes 340 and OIS magnets 220 may be provided, and the shape is structurally symmetrical. In the case of an actuator having four OIS magnets 220 in order to increase the balance of position and precision of position control, the yoke 340 also corresponds to each OIS magnet 220 so as to correspond thereto. It is preferred to have four in position.

As such, when the yokes 340 are configured in four to correspond to the OIS magnets 220, the OIS carriers 200 are inclined or tilted since the force to pull the OIS carriers 200 downward is evenly generated. This phenomenon can be prevented more effectively.

On the other hand, in order to flexibly elastically support the movement, correction movement, restoration movement, etc. of the OIS carrier 200, the elastic body 400 is more preferably coupled in a state that is not the maximum shrinkage.

In this case, however, when the elastic force of the elastic body 400, that is, the coil spring 400 is smaller than the attraction force of the yoke 340 and the OIS magnet 220 described above, the OIS carrier 200 comes into contact with the housing 300, thereby providing frictional force. Since this occurs, the movement of the OIS carrier 200 cannot be made flexibly.

In order to effectively solve this problem, the present invention may further include a ball 600, the ball 600 of the present invention, the first protrusion support 210, the second protrusion support 310 of the present invention described above Along with the attraction between the yoke 340 and the OIS magnet 220 corresponds to a configuration for preventing the OIS carrier 200 from contacting the housing 300.

In addition, the ball 600 of the present invention performs rolling movement (point) to the point contact (rolling) while maintaining the separation distance as much as the diameter of the ball 600 (movement, correction movement of the OIS carrier 200) Restoration movement is made more flexible and stable.

As shown in FIG. 3, the sum E of the height A of the first protrusion support 210, the height B of the ball 600, and the height C of the second protrusion support 310 are OIS carriers. (200) When designed to be greater than the height (D) except the separation distance between the bottom surface and the housing 300 base top surface, even if the attraction force acting between the yoke 340 and OIS magnet 220 is no longer reduced It is possible to provide a physical support structure so that the OIS carrier 200 does not touch the base of the housing 300.

In addition, since the yoke 340 continuously pulls the OIS magnet 220 downward, the ball 600 is provided on the base (bottom surface) of the housing 300 as well as the bottom surface of the first protrusion support 210. Since the point contact with the upper surface of the second protrusion support 310 to be maintained can be continued, when the OIS carrier 200 moves, corrected movement, restoring movement, the minimum frictional force by the point contact rolling motion of the ball 600 Of course, since the separation distance as much as the diameter of the ball 600 is maintained, the equilibrium state of the OIS carrier 200 is maintained as it is.

The ball 600 is preferably provided inside the coil spring 400 so as to prevent the departure to the outside as shown in the figure and according to the embodiment end of the first and second protrusion support (210, 310) A stepped structure, a groove structure, and the like, may be formed in the ball 600 to prevent the ball 600 from being separated.

Meanwhile, as shown in FIG. 4, the first protrusion support part 210, the second protrusion support part 310, and the ball 600 may be implemented in various forms.

(A), (b) and (c) of FIG. 4 illustrate a form in which the ball 600 is interposed between the first and second

protrusion support portions

210 and 310, in which case the overall height can be maintained. The height of each of the first and second

protrusion support parts

210 and 310 may be changed in various ways. In addition, a means such as a roller may be interposed between the first and second

protrusion support parts

210 and 310 instead of a spherical ball.

In addition, (d) to (g) of FIG. 4 shows a form in which the ball 600 is not interposed, but since the ball 600 is not interposed, the friction force may be partially disadvantageous, but the first and second protrusion support parts may be used. By adjusting the heights of the 210 and 310 mutually, the OIS carrier 200 can be moved, corrected, restored, etc. in a state in which the lower surface of the OIS carrier 200 and the upper surface of the housing 300 are not in contact with each other. Can be implemented.

In particular, as shown in (e) of FIG. 4, one end of each of the end portions of the first projecting support portion 210 and the second projecting support portion 310 is rounded (1 rod hemispherical shape, 2 rod hemispherical shape, etc.). ) So that the friction force can be effectively reduced.

As shown in (f) and (g) of FIG. 4, the protrusion support may be provided on only one side of the OIS carrier 200 and the housing.

Hereinafter, a detailed configuration and detailed description of the AF driving of the present invention will be described with reference to FIG. 5.

5 is a diagram illustrating an AF carrier 100 and related configurations according to a preferred embodiment of the present invention.

As described above, the AF (Auto Focus) function corresponds to a function of linearly moving the lens in the optical axis direction so that a clearer image of the subject is generated by accurately matching a focal length with the subject.

To this end, the AF carrier 100 of the present invention is configured to move forward and backward in the optical axis (Z-axis direction in the drawing). As shown in the figure, the optical axis direction in the OIS carrier 200 based on the OIS carrier 200 is shown. And to move forward and backward.

Typically, the AF drive is provided with a coil on the stator side and a magnet on the mover side moving in the optical axis direction, and the moving body is moved by the direction of the electromagnetic force and the magnitude of the force generated between the coil and the magnet. And move forward or backward in the optical axis direction.

Since the electromagnetic force is generated in a relative relationship, an embodiment in which a magnet is installed on the fixed body side and a coil is installed on the movable body side as opposed to the above example is also possible.

On the other hand, in relation to the position control of the AF carrier (moving body) moving forward and backward in the optical axis direction, when power is applied to the coil for AF driving, the movable body by the elastic restoring force of the leaf spring installed between the moving body (AF carrier) and the fixed body There is a form to restore to the initial position, which is referred to as an open loop type (open loop type) to the leaf spring type.

In addition, an AF control unit (driving drive chip) is installed on the side of the fixed body for sensing the position of the moving object (AF carrier) and controls the power of the required size and direction to be applied to the AF coil by receiving the sensing information or signal of the sensor. There is a form of feedback control of the position for the auto focus of the AF carrier (moving body) through the control of (not shown), which is referred to as a closed loop type (encoder type). The AF controller (driving drive chip) may be installed inside the actuator as in the present invention, but may be generally installed outside the actuator, that is, the device on which the actuator is mounted (smartphone).

FIG. 5 illustrates a form in which a magnet is installed on the AF carrier 100 side and a coil is installed on the OIS carrier (fixing body) 200 side among the various AF driving forms described above, and is feedback-controlled by a hall sensor or the like. Since the other forms of AF driving described above are well known to those skilled in the art, the embodiment of the present invention described with reference to FIG. 5 may also be applied to other forms of AF driving.

As shown in FIG. 5, the AF carrier 100 of the present invention is accommodated in the OIS carrier 200 and moves forward and backward in the optical axis direction (Z-axis direction) based on the OIS carrier 200 in the state.

An AF magnet 120 for AF driving is provided on the side of the AF carrier 100 of the present invention, and the AF coil 230 for AF driving in a direction opposite to the AF magnet 120 on the OIS carrier 200 side. And a second sensor 240 that is a hall sensor that senses the position of the AF carrier 100.

In addition, the AF carrier 100 is guided so that the vertical movement of the AF carrier 100 can be made smoothly, and the distance between the AF carrier 100 and the OIS carrier 200 can be kept constant. Ball bearing 250 is provided between the), the AF carrier 100 or the OIS carrier 200 may be provided with a ball guide portion 130 to which the ball bearing 250 is guided.

The OIS carrier 200 is provided with an AF yoke that generates an attraction force in the AF magnet 120 so that the AF carrier 100 continuously maintains a constant height position while being in point contact with the ball bearing 250. Can be. By the attraction force generated between the AF yoke and the AF magnet 120, the AF carrier 100 does not fall to the bottom surface by gravity and maintains the current position.

As described above, since the OIS magnet 220 for driving OIS is provided on the outer circumferential side of the OIS carrier 200, mutual attraction is generated by adjusting the polarity between the OIS magnet 220 and the AF magnet 120. In this case, the OIS magnet 220 may perform the above-described AF yoke function so that the AF yoke may be omitted.

Hereinafter, a preferred embodiment of the present invention for applying an external power source to a coil for AF driving or the like will be described in detail with reference to FIG. 6.

According to the present invention, the coil spring 400 for guiding the movement, the correction movement, and the restoration movement of the OIS carrier 200 elastically as described above, the AF coil 230 mounted inside the OIS carrier 200 or By utilizing the interfacing structure for power supply or signal connection to the second sensor 240, the structure and space utilization of the actuator device are further optimized.

As shown in FIG. 6, the base 370 of the housing 300 is provided with a circuit board (FPCB) 350 for electrical connection with an external power source or a driving drive chip (AF controller) as described above.

The first plate 360 shown in the drawing is made of a conductive material and is electrically connected to the circuit board 350. The coil spring of the present invention (resilient form of the shape of the present invention) previously described above the first plate 360. 400 is electrically connected.

As illustrated in the drawing, the first plate 360 and the circuit board may be formed by various methods, including a method in which the protrusion 361 of the first plate 360 is coupled to the connection part 352 of the circuit board 350. 350 can be electrically connected.

The coil spring may be connected to the first plate 360 through a method such as conductive epoxy or soldering, and the coil spring may be made of a metal of conductive material, or a conductive resin, fluid, or the like may be applied to transmit an electrical signal. have.

OIS carrier 200 of the present invention is provided with a second circuit board (FPCB) (270), the second circuit board 270 is a second sensing circuit for sensing the position of the AF carrier 100 through the patterning (patterning), etc. It is electrically connected to the two sensors 240 or / and the AF coil 230.

A second plate 260 electrically connected to the second circuit board 270 is provided below the second circuit board 270, and a coil spring of the present invention is placed below the second plate 260. The elastic body 400 of the top is electrically connected.

Through the above configuration, the external power is supplied to the AF coil 230 through the path of the circuit board 350 → the first plate 360 → the coil spring 400 → the second plate 260 → the second circuit board 270. Is applied to.

In a similar manner, the signal of the second sensor 240 is transmitted through the path of the second circuit board 270 → the second plate 260 → the coil spring 400 → the first plate 360 → the circuit board 350. It is delivered to the AF control unit (drive drive chip) that can be provided externally.

According to the present invention, four coil springs and a corresponding number of first and

second plates

360 and 260 may be provided, so that the coil springs may be electrically divided and correspond to the circuit board 350 and the second circuit board 270. The patterning may be implemented so that power is applied through two paths, and the signal of the hall sensor may be interfaced through the two paths.

In addition, in the case of the open route type described above, since the signal processing by the hall sensor is not necessary, the wiring path for power supply using only the four coil springs and the first and

second plates

360 and 260 described above may be used. In order to implement a more stable power supply, the wiring path may be implemented by dividing four coil springs and two first and second plates.

In order to increase the efficiency of assembly or coupling between components, the second circuit board 270 electrically connected to the AF coil 230 and / or the second sensor 240 may be embedded in the OIS carrier 200. The two plates 260 are coupled upwardly from the bottom of the OIS carrier 200, but the grooves 271 formed on the second circuit board 270 are formed by protruding portions 261 which are bent upwards as shown in FIG. 6. ) Can be configured to fit.

On the other hand, although not shown in the drawing, under the actuator 1000 of the present invention is provided with an image sensor and image processor such as CMOS (CMOS), CD (CCD) for converting the light signal input through the lens into an electrical signal The filter may further include a filter for filtering the light signal between the lens and the image sensor (processor).

In the above description of the present invention, modifiers such as first and second are only terms of a tool concept used to relatively distinguish the components from each other, and thus are used to indicate a specific order, priority, and the like. It should not be interpreted as being a term.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

The accompanying drawings for the purpose of describing the present invention and the embodiments thereof may be shown in somewhat exaggerated form in order to emphasize or highlight the technical contents of the present invention. It should be understood that various forms of modification application may be possible at the level of ordinary skill in the art in consideration.

Claims

An AF carrier moving in the optical axis direction;

An OIS carrier moving in the vertical direction of the optical axis and mounted with the AF carrier;

A housing in which the OIS carrier is accommodated; And

One end is connected to the OIS carrier, the other end is an optical actuator, characterized in that it comprises a standing-type elastic body connected to the base of the housing.
The method of claim 1, wherein the elastic body,

Optical actuator, characterized in that the coil spring.
According to claim 2, The OIS carrier or the base of the housing,

Actuator for optics, characterized in that it comprises a projecting support to which the coil spring is fitted.
The method of claim 3, wherein

And a ball provided inside the coil spring and facing the bottom surface of the first protrusion support provided in the OIS carrier and the top surface of the second protrusion support provided in the base of the housing.
The method of claim 3, wherein

And a first protrusion support part provided in the OIS carrier and a second protrusion support part provided in the base of the housing to each other.
The method of claim 5,

One end of each of the end portions of the first and second protruding support portions facing each other has a rounded shape.
The method of claim 2, wherein the OIS carrier,

OIS magnet is provided,

The housing,

An OIS coil provided in a direction facing the OIS magnet to generate an electromagnetic force in the OIS magnet; And

And a sensor for sensing the position of the OIS carrier.
The method of claim 7, wherein the AF carrier,

AF magnet is provided,

The OIS carrier,

And an AF coil provided in a direction facing the AF magnet to generate an electromagnetic force in the AF magnet.
The method of claim 8, wherein the housing,

Further comprising a first plate provided on the base and electrically connected to an external power source,

The OIS carrier,

Further comprising a second plate electrically connected to the AF coil,

The coil spring made of a conductive material is an optical actuator, characterized in that for electrically connecting the first plate and the second plate.
The method of claim 7, wherein the housing,

A first plate provided on the base and electrically connected to an external power source or an external AF control unit;

The OIS carrier,

A second sensor sensing a position of the AF carrier; And

Further comprising a second plate electrically connected to the AF coil or the Hall sensor,

The coil spring made of the conductive material is an optical actuator, characterized in that for electrically connecting the first plate and the second plate.
An AF carrier moving in the optical axis direction;

An OIS carrier moving in the vertical direction of the optical axis and mounted with the AF carrier;

A housing in which the OIS carrier is accommodated;

A protruding support provided on at least one of the OIS carrier or the base of the housing and protruding in the optical axis direction; And

And a coil spring coupled to the protruding support and connected to the base of the OIS carrier and the housing.