KR102351233B1 - Actuator for auto focus and driving driver controlling it - Google Patents

Abstract

The actuator for AF of the present invention includes a carrier on which a lens assembly is mounted and moving in an optical axis direction; a housing that physically supports the carrier; a first coil provided in the housing; a second coil provided in the housing to be spaced apart from the first coil; and a driving magnet provided on the carrier, positioned between the first and second coils so that a first surface portion faces the first coil and a second surface portion opposite to the first surface portion faces the second coil. characterized by including.

Description

An actuator for AF and a driving driver that controls the driving

The present invention relates to an actuator for AF and a driving driver for controlling the driving thereof, and more particularly, to an actuator that further improves the driving precision of AF by using a plurality of coils facing each side on both sides of a driving magnet.

As hardware technology for image processing develops and user needs for image shooting increase, autofocus (AF, Auto Focus) is applied to camera modules installed in mobile terminals such as mobile phones, smartphones, etc., as well as independent camera devices. Functions such as optical image stabilization (OIS) are being implemented.

The autofocus (autofocus control) function adjusts the focal length with the subject by linearly moving the carrier on which the lens is mounted in the direction of the optical axis to create a clear image on the image sensor (CMOS, CCD, etc.) provided at the rear end of the lens. means function.

Also, recent attempts have been made to mount a zoom lens capable of varying the size of a subject by variously adjusting the focal length through zoom-in and zoom-out functions.

In the case of a zoom lens, since it has a structure in which a plurality of lenses or lens groups are arranged coaxially in the optical axis direction through which light is generally introduced, the length thereof is extended in the optical axis direction than a general lens, and various adjustments of the focal length are performed. For this purpose, it has a characteristic that the movement displacement moving with respect to the optical axis direction is relatively large.

In the case of such a zoom lens, a sufficient distance must be secured between the lens and the image sensor due to the unique optical characteristics of the lens itself. It should also be designed so that a further extended distance is secured.

Conventionally, in order to implement such an optical characteristic, a method of facing a relatively large magnet and a coil is applied. However, in the case of this method, since the size of the magnet and the coil increases, there is a disadvantage that the volume of the device itself becomes enlarged.

In general, the coil is formed in a wound track shape. Among the coil regions facing the magnet, in the coil region having a direction parallel to the optical axis direction, a magnetic force orthogonal to the magnetic force of the magnet is generated, so the magnet ( The driving force for moving the carrier provided with the magnet) is not generated, and the driving force is generated only in the coil region in a direction perpendicular to the optical axis direction (hereinafter referred to as an 'effective region').

Therefore, even if the size of the coil and magnet is simply increased, if the movement range of the AF carrier equipped with the magnet increases like a zoom lens, the magnetic poles (N and S poles) and the magnetic pole boundary of the magnet easily deviate from the effective area of the coil, so a certain range If it is out of , a driving force degradation problem may easily occur, and there is a problem in that precise control of linearly driving the movement of the AF carrier in the optical axis direction becomes difficult.

Korean Patent Laid-Open Publication No. 10-2004-0090381 (October 22, 2004) Korean Patent Publication No. 10-2019-0128279 (2019.11.18)

The present invention was devised to solve the above-mentioned problems in the background as described above, and it is possible to improve driving efficiency through structural improvement of a plurality of coils and a driving magnet disposed between the plurality of coils, as well as a driving magnet That is, an object of the present invention is to provide an actuator that can further increase the driving precision for linear control by dualizing the coil controlled according to the optical axis direction position of the carrier on which the driving magnet is mounted.

Other objects and advantages of the present invention can be understood from 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 the combination of the configuration.

The actuator for AF of the present invention for achieving the above object includes a carrier on which a lens assembly is mounted and moving in the optical axis direction; a housing that physically supports the carrier; a first coil provided in the housing; a second coil provided in the housing to be spaced apart from the first coil; and a driving magnet provided on the carrier, positioned between the first and second coils so that a first surface portion faces the first coil and a second surface portion opposite to the first surface portion faces the second coil. may be included.

Here, the second coil of the present invention is preferably disposed at a higher position than the first coil with respect to the optical axis direction.

In addition, the present invention is a guide rail formed in the housing and extending in the optical axis direction; a groove portion rail formed on a first facing portion that is a surface portion facing the guide rail in the carrier and facing the guide rail; and a ball disposed between the guide rail and the groove part rail.

Furthermore, the present invention includes a second magnet provided in the first facing portion; and a yoke provided in the housing, disposed to face the second magnet with the ball interposed therebetween, and generating an attractive force to the second magnet.

More preferably, the carrier of the present invention includes a body portion on which the lens assembly is mounted; and a magnet support part physically connected to the body part and supporting the driving magnet so that the first and second surface parts of the driving magnet protrude in a direction perpendicular to the optical axis direction.

According to an embodiment, the carrier of the present invention includes a body portion on which the lens assembly is mounted; and physically connected to the body, the driving magnet is arranged side by side with the body of the carrier with respect to the optical axis direction, and supporting the driving magnet so that a first space is formed between the driving magnet and the body It may include a magnet support, in this case, one of the first coil or the second coil may be configured to be located in the first space.

More preferably, the present invention controls so that power is applied to the first coil when the position of the driving magnet is lower than the reference position, and when the position of the driving magnet is higher than the reference position, power is applied to the second coil It may be configured to further include a driving driver to control so as to be.

Here, the upper winding portion of the first coil is located at a position lower than the upper winding portion of the second coil and higher than the lower winding portion of the second coil, and the reference position is that the magnetic pole boundary of the driving magnet is the first coil It is preferable to set the position corresponding to the upper winding of the.

In the driving driver of the present invention for achieving the object according to another aspect, a magnet provided in a carrier moving in the optical axis direction, a first coil facing the first surface portion of the magnet, and a second surface portion different from the first surface portion A driving driver for driving and controlling an actuator for AF, which includes a second coil facing the magnet and provided at a higher position than the first coil, and a position sensor for detecting a position in the optical axis direction of the carrier, wherein the lowermost position of the carrier a first information storage unit for storing the first output value of the position sensor and the second output value of the position sensor when the carrier is at the uppermost position; a second information storage unit for storing a third output value output by the position sensor when the carrier is positioned at a reference position that is an intermediate position between the first coil and the second coil; a code processing unit configured to store code data according to a unit movement position of the carrier as data generated using the first and second output values; and when the current output value of the position sensor is less than the third output value, power is applied to the first coil using the code data, and when the third output value or more, power is supplied to the second coil using the code data It may be configured to include a main control unit that controls to be applied.

According to a preferred embodiment of the present invention, by configuring the coils to face each of the plurality of surface portions of the driving magnet provided in the carrier, which is a moving body, it is possible to provide the effect of further enhancing the driving efficiency.

According to another embodiment of the present invention, by differentiating the heights of a plurality of coils from each other based on the optical axis direction, and implementing such that the coil used for driving control is switched according to the height of the carrier, even if the moving distance of the carrier is extended Linear drive control for each position can be implemented more precisely.

In addition, according to the present invention, it is possible to implement an actuator optimized for driving in which the movement of the carrier increases, such as zoom driving, through structural improvement in which a magnet for AF driving is disposed between the coil and the coil, as well as the size of the actuator. Since it can be relatively down-sized, it is possible to more effectively implement miniaturization of the actuator itself.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to more effectively understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so the present invention is described in these drawings It should not be construed as being limited only to the matters.
1 is a view showing the overall configuration of an actuator for AF and a camera module including the same according to a preferred embodiment of the present invention;
2 is a view showing the overall configuration of the carrier and the housing according to a preferred embodiment of the present invention;
3 is a view showing a carrier of the present invention and a detailed configuration related thereto;
4 is a view showing a housing of the present invention and a detailed configuration related thereto;
5 is a view showing the positional relationship between the driving magnet and the coil according to the position of the carrier;
6 is a view showing the overall configuration of the carrier and the housing according to another embodiment of the present invention;
7 is a block diagram showing a detailed configuration of a driving driver according to another embodiment of the present invention;
8 is a flowchart illustrating a driving control processing process according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of the present invention.

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

1 is a view showing the overall configuration of an actuator 100 for AF (hereinafter referred to as an 'actuator') according to a preferred embodiment of the present invention.

Of course, the actuator 100 of the present invention may be implemented as a single device by itself, and may also be implemented as a camera module 1000 including an optical system module 200 and the like as shown in FIG. 1 .

The actuator 100 of the present invention linearly moves the carrier 120 on which the lens assembly 50 is mounted (see FIG. 2, etc.) in the optical axis direction to implement auto focus (AF) or zoom. , zoom driving is mainly applied to the case of a large stroke, so in the following description, zoom driving will be described as a basic embodiment, but according to an embodiment, it may be applied to other embodiments including AF, of course.

The optical system module 200 performs a function of reflecting or refracting the light (LIGHT) path (Z1) of the subject to the path (Z) in the lens direction. As described above, the light reflected or refracted in the optical axis direction Z is introduced into an imaging device (not shown) such as CMOS or CCD through the lens assembly 50 provided in the carrier.

The optical system module 200 for changing the path of light includes an optical system 210 that may be formed of one selected from a mirror or a prism or a combination thereof. The optical system 210 may be implemented by various members that can change the light entering from the outside in the optical axis direction, but is preferably implemented with a glass material in order to improve optical performance.

The camera module 1000 of the present invention including the optical system module 200, etc. is configured to refract the path of light so that light flows in the lens assembly 50 direction, so that the lens itself is not installed in the thickness direction of the mobile terminal. Since it can be installed in the longitudinal direction, the thickness of the portable terminal is not increased, and thus the portable terminal can be optimized for miniaturization or slimming.

Depending on the embodiment, the optical system 210 may be configured to be rotationally moved by a driving means that generates a magnetic force such as a magnet or a coil. As such, when the optical system 210 moves or rotates based on the YZ plane and/or the XY plane, the light of the subject reflected (refracted) through the optical system 210 moves in the ±Y direction and/or the ±X direction. Since it is incident to the image pickup device or the lens, correction in the X-axis and/or Y-axis direction due to hand shake may be implemented.

2 is a view showing the overall configuration of the carrier 120 and the housing 110 according to an embodiment of the present invention.

As shown in Figure 2, the carrier 120 of the present invention is mounted directly or through the medium of another carrier, as described above, the lens assembly 50 in the optical axis direction (Z-axis direction) with respect to the housing 110. ) corresponds to a configuration that moves linearly.

In this respect, the carrier 120 of the present invention corresponds to a moving body, and the housing 110 corresponds to a fixed body in a corresponding point of view. The housing 110 of the present invention provides a movement space in which the carrier 120 moves so that the carrier 120 moves in the optical axis direction as described above, and physically supports the carrier 120 .

2, the structure or shape of the housing 110 is schematically shown in order to clearly explain the technical idea of the present invention, but it is implemented in various shapes or structures, including the form shown in FIG. 2, depending on the embodiment Of course it could be.

The circuit board 170 of the present invention may be implemented in the form of an FPCB or the like, and is provided on the housing 110 side corresponding to the fixed body. The circuit board 170 may be formed in a bent shape as shown in FIG. 2 and the like, and the circuit board 170 has a first coil C1, a second coil C2, or a driving driver 300, etc. Components that require power application and control signal interfacing are mounted.

As in the conventional method, in this invention, a driving magnet M1 for receiving a driving force is installed on the carrier 120, which is a moving body. However, as illustrated in FIG. 2 and the like, in the driving magnet M1 of the present invention, not only one-side is exposed to the coil as in the conventional method, but two-side is exposed to the coil. have

To this end, the second coil C1 of the present invention is disposed in the housing to be spaced apart from the first coil C1. In other words, the first coil C1 and the second coil C2 of the present invention are the first coil C1. ) and the second coil (C2) is arranged to form a space (S, see FIG. 4) is formed, the driving magnet (M1) of the present invention is configured to be located in this space (S).

That is, the second coil (C2) is provided to face the first coil (C1) with the driving magnet (M1) interposed therebetween. placed face to face.

From the standpoint of the driving magnet M1 installed in the carrier 120, the driving magnet M1 of the present invention has a first surface portion facing the first coil C1 and a second surface opposite to the first surface portion. The additional coil is positioned between the first coil C1 and the second coil C2 to face the second coil C2.

In the following description, among the exposed surfaces of the driving magnet M1, the surface portion facing the first coil C1 is referred to as a 'first surface portion', and the surface portion facing the second coil C2 is referred to as a 'second surface portion'. .

As described above, in the present invention, the driving magnet M1 to which the driving force is transmitted from the coil is exposed, unlike the traditional method, two surface portions are exposed, and each of the first surface portion and the second surface portion that is each exposed surface portion has a plurality of coils (first coil C1). ) and the second coil (C2)), so that the driving force from each of the first coil (C1) and the second coil (C2) is intensively transmitted.

Through such a configuration, the driving magnet M1 of the present invention can simultaneously or selectively transmit driving force from a plurality of coils, so that the driving force can be more intensively enhanced, thereby further increasing driving efficiency.

In addition, the housing 110 of the present invention is provided with one or more guide rails 111 for guiding the movement of the carrier 120 in the optical axis direction linearly, as will be described later.

As shown in the drawing, the guide rail 111 has a shape in which the shape of the groove extends in the optical axis direction, and the cross section of the shape of the groove may be one of a V-shape or a U-shape, depending on the embodiment.

The driving driver 300 of the present invention controls so that power of an appropriate size and direction is applied to the first coil C1 or the second coil C2 using the output value of the position sensor for detecting the position of the carrier 120. corresponds to the configuration.

The position sensor may be implemented as a hall sensor that detects a change in the magnetic field size and direction of a magnet existing in the sensing area using the hall effect and outputs an electrical signal accordingly, and SOC, etc. It may be implemented in the form of a single chip, integrated with the driving driver 300 through the.

It goes without saying that a position sensor such as a hall sensor is disposed to face the driving magnet M1 described above to detect a change in a magnetic field in relation to the driving magnet M1. In this case, the Hall sensor may be installed in the inner space of the first coil C1 and/or the second coil C2.

In addition, according to the embodiment, a sensing magnet M3 is provided on the side surface of the carrier 120 (in the X-axis direction in FIG. 2 ), and a position sensor such as a hall sensor is connected to the carrier 120 in relation to the sensing magnet M3. ) may be configured to detect the position of

3 and 4 are views showing detailed configurations related to the carrier 120 and the housing 110 of the present invention.

The carrier 120 according to an embodiment of the present invention includes a body part 123 and the body part 123 on which the lens assembly 50 is mounted directly or through a medium such as another carrier or structure, as shown in FIG. 3 . ) and may be physically connected to and include a magnet support 125 on which the driving magnet M1 is mounted.

In the embodiment shown in FIG. 3, the magnet support part 125 for supporting the driving magnet M1 so that the first and second surface parts of the driving magnet M1 protrude in a direction (X-axis direction) perpendicular to the optical axis direction. is shown.

In the driving magnet M1 of the present invention, as shown in FIG. 3 , the N pole and the S pole form a magnetic pole in both the first surface part (top view of FIG. 3 ) and the second surface part (bottom view of FIG. 3 ), so-called, A four-pole seating structure can be achieved.

The carrier 120 of the present invention is formed in a first facing portion, which is a surface portion facing the guide rail 111 formed in the housing 110, as shown in the lower drawing of FIG. 3, and the guide rail 111 and One or more grooved rails 127 facing each other are formed.

In addition, one or more balls (B) are disposed between the groove part rail 127 formed in the carrier 120 and the guide rail 111 formed in the housing 110, depending on the embodiment, the ball (B) Silver may be provided in a form in which a part is accommodated in the groove rail 127 or the guide rail 111 .

In this way, when the ball B is disposed between the groove part rail 127 and the guide rail 111, the carrier 120 maintains an appropriate distance from the housing 110 through the ball B, and the ball B ) of the point-contact, the movement of the ball B, and the minimized frictional force due to rolling, etc., can make linear movement more flexibly, reducing noise as well as linear movement of the carrier 120 It is possible to minimize the driving force for

Furthermore, the carrier 120 may further include a second magnet M2 provided on a first facing portion, which is a surface portion facing the housing 110 and having a groove rail 127 formed therein, and may include a second magnet M2 of the housing 110 . A yoke 113 that is disposed to face the second magnet M2 with the ball B interposed therebetween and generates an attractive force with the second magnet M2 may be provided on the surface portion facing the second magnet M2. .

When configured in this way, the carrier 120 can continuously maintain point contact with the ball B by the attractive force between the yoke 113 and the second magnet M2, so that it is not separated to the outside and the diameter of the ball B It is possible to maintain an accurate separation distance corresponding to the housing 110 and.

According to the embodiment, the second coil C2 is preferably configured to be disposed at a higher position H than the first coil C1 with respect to the optical axis direction (Z axis direction) as shown in FIG. 4 .

In addition, as described above, the first coil (C1) and the second coil (C2) are disposed to be spaced apart from each other to form a spaced space S therebetween, and the driving magnet M1 is located in the spaced space S. is disposed so that the first surface portion of the driving magnet M1 faces the first coil C1 and the second surface portion of the driving magnet M1 faces the second coil C2.

5 is a diagram illustrating a positional relationship between the driving magnet M1 and the coils C1 and C2 according to the position of the carrier 120 .

The carrier 120 of the present invention moves linearly by a distance designed based on the optical axis direction, and the driving magnet M1 is also installed in the carrier 120 , so that it moves together with the carrier 120 in the optical axis direction.

The left view of FIG. 5 shows the positional relationship between the coils C1 and C2 and the driving magnet M1 when the driving magnet M1 (carrier 120) is located at the lowest (based on the optical axis direction) (position A). is a view showing the positional relationship between the coils C1 and C2 and the driving magnet M1 when the driving magnet M1 is at the highest and uppermost position (position C).

The middle diagram of FIG. 5 shows the positional relationship between the coils C1 and C2 and the driving magnet M1 when the driving magnet M1 is positioned at a reference position corresponding to the middle region from the bottom to the top (position B). is a diagram showing

The reference position may be variously set according to the embodiment, but the positional relationship between the effective region in which magnetic force is generated in the coils C1 and C2 and the magnetic pole boundary (the boundary between the N and S poles) of the driving magnet M1 And it is preferable that the magnetic pole boundary of the driving magnet M1 is set to a position corresponding to the upper winding portion of the first coil C1 by reflecting the linear relationship of the magnetic force generated therebetween.

The coils C1 and C2 have a wound track shape, wherein the upper winding parts C1-T and C2-T are portions located above the optical axis among the wound track shapes in a direction perpendicular to the optical axis ( 5 refers to a portion having a shape extending in the X-axis direction).

From a corresponding point of view, the lower winding parts (C1-B, C2-B) are parts located below the optical axis among the wound track shapes and extend in a direction perpendicular to the optical axis (X-axis direction in FIG. 5). means the part that has.

When the driving magnet M1 provided in the carrier 120 is located from the position A to the position B, the upper and lower magnetic poles are the upper winding portion of the first coil C1 based on the magnetic pole boundary of the driving magnet M1. Since they face (C1-T) and the lower winding portion (C1-B), the magnetic force generated in the first coil (C1) may generate an effective driving force in the driving magnet (M1).

On the other hand, when the driving magnet M1 is located between the positions B and C, the upper and lower magnetic poles of the driving magnet M1 are the upper winding portion C2-T and the lower winding portion of the second coil C2. Since it faces C2-B, in this case, the magnetic force generated in the second coil C2 instead of the first coil C1 may generate an effective driving force in the driving magnet M1.

Generating an effective driving force means that the movement control of the driving magnet M1 by the electromagnetic force generated in the coil is effectively and linearly performed even in the size of the generated driving force.

Therefore, when the first coil C1 is disposed at a relatively low position and the second coil C2 is configured to be disposed at a relatively high position, the position of the driving magnet M1 is lower than the reference position. , the driving driver 300 of the present invention controls so that power is applied to the first coil C1.

In addition, when the position of the driving magnet M1 is higher than the reference position, power is controlled to be applied to the second coil C2 disposed at a position higher than the first coil C1 in the optical axis direction.

That is, in the case of the embodiment of the present invention, by controlling the coils to be diversified and selectively applying a different coil for generating a driving force to the driving magnet M1 according to the position of the driving magnet M1, the driving magnet M1, that is, Even if the movement distance in the optical axis direction of the carrier 120 is extended, it is possible to induce effective linear control at all times.

More preferably, the upper winding portion C1-T of the first coil C1 disposed at a relatively low position is lower than the upper winding portion C2-T of the second coil C2 and the second coil C2 It may be configured to be located at a higher position than the lower winding portion (C2-B) of the . In this configuration, even if the coil to be driven is switched, linear control of the drive magnet M1 can be continuously implemented.

As described above, if the technical idea of the present invention such that different coils are applied according to the position of the driving magnet M1 in the optical axis direction can be implemented, the coils having different heights are further extended in the optical axis direction to n (n is 3 Of course, it can be made of more than a natural number) number of coils.

6 is a view showing the overall configuration of the carrier 120 and the housing 110 according to another embodiment of the present invention.

FIG. 6 implements the technical idea corresponding to the embodiment shown in FIG. 2 , but has a different physical structure. The embodiment shown in FIG. 6 differs only in the direction in which the driving magnet M1 is disposed, and as described above with reference to FIG. 2 , a plurality of coils and disposed between the coils C1 and C2 are provided. The basic configuration of the driving magnet M1 is the same.

6, the carrier 120 according to this embodiment also includes a body part 123 on which the lens assembly 50 is mounted and a magnet support part 125 physically connected from the body part 123. do.

However, the magnet support part 125 according to this embodiment supports the driving magnet M1 so that the driving magnet M1 is arranged side by side with the body part 123 of the carrier 120 in the optical axis direction, and the driving The magnet M1 is configured to support the driving magnet M1 so that a first space S1 spaced apart from the body portion 123 is formed.

As described above, one of the first coil C1 or the second coil C2 is positioned in the first space S formed between the body 123 and the driving magnet M1.

7 is a block diagram illustrating a detailed configuration of a driving driver 300 according to another embodiment of the present invention, and FIG. 8 is a flowchart illustrating a driving control processing process according to an embodiment of the present invention.

The driving driver 300 of the present invention is a driving driver 300 that controls the driving of the actuator 100 of the present invention described above, and as shown in FIG. 7 , the first information storage unit 310 and the second information It may be configured to include a storage unit 320 , a characteristic information storage unit 330 , a code processing unit 340 , a main control unit 350 , and an input unit 360 .

Each component of the driving driver 300 according to the present invention shown in a block diagram in FIG. 7 should be understood as a logically divided component rather than a physically divided component.

That is, since each configuration corresponds to a logical component for realizing the technical idea of the present invention, even if each component is integrated or configured separately, if the function performed by the logical configuration of the present invention can be realized, the present invention It should be construed as being within the scope, and if it is a component that performs the same or similar function, it should be construed as being within the scope of the present invention regardless of whether the name is consistent.

The first information storage unit 310 and the second information storage unit 320 are configured to store various set values or measurement data performed in the pre-processing (S900, see FIG. 8). First, the first information storage unit 310 ) stores the first output value output by the position sensor 400 when the carrier 120 is located at the bottom and the value 2 output value output by the position sensor 400 when the carrier 120 is located at the top (S901) ).

As described above, in the second information storage unit 320 of the present invention, when the driving magnet M1 is located in the reference position (position B), that is, the driving magnet M1 is the first coil C1 and the second When the coil C2 is positioned at the intermediate position, the third output value output by the position sensor 400 is stored (S903).

Of course, the first and second output values may be set as statistical values such as an average value or a weighted average value through a plurality of tests.

The characteristic information storage unit 330 of the present invention includes specification information of hardware or software implementing the position sensor 400 and/or the driving driver 300 implemented as a hall sensor, etc., and physical characteristic data of the coils C1 and C2. Characteristic information, such as, is stored.

As mentioned above, the position sensor 400 may be implemented as a single chip integrated with the driving driver 300, but in FIG. has been

When the first and second output values are stored in this way, the code processing unit 340 of the present invention uses the characteristic information stored in the characteristic information storage unit 330, the first output value, the second output value, etc., based on the optical axis direction. Code data according to the unit movement position of the moving carrier 120 is generated and stored (S905).

When the pre-processing (S900) of setting and storing the basic data for driving control of the carrier 120 is completed in this way, the actual control processing for driving the actuator 100 is performed.

First, when the present output value currently output from the position sensor 400 is input through the input unit 360, which is the interface of the driving driver 300 of the present invention, and the input current output value is smaller than the third output value (S921), that is, When the current output value is between the first output value and the third output value, the main control unit 350 of the present invention uses the code data stored in the code processing unit 340 to obtain an appropriate size and direction for the first coil C1. Control is applied so that power is applied (S923).

On the other hand, when the current output value input from the position sensor 400 is greater than the third output value, that is, when it is a value between the third output value and the second output value, the main controller 350 of the present invention sends the code processing unit 340 to the It is controlled so that power of an appropriate magnitude and direction is applied to the second coil C2 by using the stored code data (S925).

That is, the driving driver 300 of the present invention selectively applies the coils C1 and C2 for controlling the driving magnet M1 according to the size of the current output value input from the position sensor 400 to the driving magnet M1. A handover processing of switching the coils C1 and C2 according to a position, that is, a position with respect to the optical axis direction of the carrier 120 is performed.

Of course, if a preset termination condition, such as a power off or AF function deactivation command, is not satisfied (S930), the processing of the present invention described above may be cyclically applied.

In the above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto and will be described below with the technical idea of the present invention by those of ordinary skill in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims.

In the above description of the present invention, modifiers such as 1st and 2nd are only instrumental terms used to relatively distinguish components from each other, so they are used to indicate a specific order, priority, etc. It should not be construed as a term that is

The accompanying drawings for the purpose of explaining the present invention and illustrating examples thereof may be shown in a somewhat exaggerated form in order to emphasize or highlight the technical contents of the present invention, but the above-described contents and matters shown in the drawings, etc. It should be construed as obvious that various types of modification application examples are possible at the level of those skilled in the art in consideration of this.

1000: camera module
100: actuator of the present invention 110: housing
111: guide rail 113: yoke
120: carrier 123: body portion
125: magnet support 127: groove rail
M1: driving magnet M2: second magnet
M3: Sensing magnet C1: 1st coil
C1-T: upper winding part of the first coil C1-B: lower winding part of the first coil
C2: Second coil C2-T: Upper winding of second coil
C2-B: lower winding part of the second coil 300: driving driver
310: first information storage unit 320: second information storage unit
330: characteristic information storage unit 340: code processing unit
350: main control unit 360: input unit
400: position sensor

Claims (9)

a carrier on which the lens assembly is mounted and moving in the optical axis direction;
a housing that physically supports the carrier;
a first coil provided in the housing;
a second coil provided in the housing to be spaced apart from the first coil and disposed higher than the first coil in an optical axis direction;
a driving magnet provided on the carrier and positioned between the first and second coils such that a first surface portion faces the first coil and a second surface portion opposite to the first surface portion faces the second coil; and
When the position of the driving magnet is lower than the reference position, it controls so that power is applied to the first coil, and when the position of the driving magnet is higher than the reference position, it includes a driving driver that controls so that power is applied to the second coil An actuator for AF, characterized in that. delete The method of claim 1,
a guide rail formed in the housing and extending in the optical axis direction;
a groove portion rail formed on a first facing portion that is a surface portion facing the guide rail in the carrier and facing the guide rail; and
The actuator for AF, characterized in that it further comprises a ball disposed between the guide rail and the groove part rail. 4. The method of claim 3,
a second magnet provided on the first facing portion; and
The actuator for AF, comprising a yoke provided in the housing, disposed to face the second magnet with the ball interposed therebetween, and generating an attractive force to the second magnet. According to claim 1, wherein the carrier,
a body portion on which the lens assembly is mounted; and
and a magnet support part physically connected to the body part and supporting the driving magnet so that the first and second surface parts of the driving magnet protrude in a direction perpendicular to the optical axis direction. According to claim 1, wherein the carrier,
a body portion on which the lens assembly is mounted; and
A magnet physically connected to the body, the driving magnet is arranged side by side with the body of the carrier with respect to the optical axis direction, and supporting the driving magnet such that a first space is formed between the driving magnet and the body comprising a support;
One of the first coil or the second coil,
An actuator for AF, characterized in that it is located in the first space. delete According to claim 1, wherein the upper winding portion of the first coil,
Located in a position lower than the upper winding portion of the second coil and higher than the lower winding portion of the second coil,
The reference position is an actuator for AF, characterized in that the magnetic pole boundary of the driving magnet is a position corresponding to the upper winding portion of the first coil. A magnet provided in a carrier moving in the optical axis direction, a first coil facing a first surface portion of the magnet, a second surface portion different from the first surface portion facing the magnet and provided at a higher position than the first coil As a driving driver for driving and controlling an actuator for AF including two coils and a position sensor for detecting a position in the optical axis direction of the carrier,
a first information storage unit for storing a first output value of the position sensor and a second output value of the position sensor when the carrier is positioned at the lowermost end of the carrier;
a second information storage unit for storing a third output value output by the position sensor when the carrier is positioned at a reference position that is an intermediate position between the first coil and the second coil;
a code processing unit configured to store code data according to a unit movement position of the carrier as data generated using the first and second output values; and
When the current output value of the position sensor is less than the third output value, power is controlled to be applied to the first coil using the code data, and when the current output value is greater than the third output value, power is supplied to the second coil using the code data A driving driver for driving control of the AF actuator, characterized in that it comprises a main control unit for controlling the application.

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