Actuator for camera

Abstract

An actuator for a camera according to an embodiment of the present invention comprises: a plurality of movers that rotate in mutually different directions; magnets which are respectively arranged on the plurality of movers; and a back yoke provided behind one or more of the magnets provided on each of the plurality of movers, the back yoke including a cover portion that forms a gap with a side surface of the magnet provided in front of the back yoke and covers the side surface.

Description

TECHNICAL FIELD

[0001] The present application relates to an actuator for a camera, and more particularly, to an actuator for a camera that further improves driving accuracy by improving the structure of a back yoke. BACKGROUND

[0002] With the development of hardware technology for image processing and the increase in user needs for image capturing and the like, functions such as auto focus (AF), optical image stabilization (OIS), and the like have been applied to independent camera devices and camera modules installed in mobile terminals such as mobile phones, smart phones, and the like.

[0003] The auto focus (Auto Focus) function refers to a function of adjusting the focal length with respect to a subject by linearly moving a carrier on which a lens or the like is mounted in the optical axis direction, thereby generating a clear image in an image sensor (CMOS, CCD, or the like) provided at the rear end of the lens.

[0004] The optical image stabilization function refers to a function of improving the clarity of an image by adaptively moving a carrier on which a lens (or an image sensor) is mounted in a direction that compensates for the shake of the lens or the image sensor in the case where the shake is generated due to hand shake.

[0005] One of the representative methods of implementing the auto focus or OIS function is to provide a magnet (coil) on a mover (carrier) and a coil (magnet) on a stator (housing, base, or other form of carrier, or the like), and then to generate a driving force between the coil and the magnet, thereby moving the mover in the optical axis direction or a direction perpendicular to the optical axis.

[0006] On the other hand, a zoom lens having a specification that can variably adjust the focal length in various ways or can capture an image of a long distance or the like is installed in recent mobile terminals in order to satisfy higher user needs and more diversely implement the convenience of users and the like.

[0007] Such a zoom lens has a structure in which a plurality of lenses or lens groups or the like are arranged side by side, or has a characteristic in which the length in the optical axis direction of the lens itself is long, and thus a larger mounting space needs to be prepared in the mobile terminal.

[0008] Recently, an actuator or a camera module or the like has been disclosed, which has a physical structure of refracting the light of a subject using a reflector arranged at the front end of the lens, in order to organically fuse the physical characteristics of such a zoom lens with the geometric characteristics of the portable terminal.

[0009] Such an actuator or the like using a reflector for reflecting light of an object toward a lens direction, which moves (rotates) in one or two axes to realize OIS when shaking occurs, rather than making a correction movement of the lens.

[0010] Generally, such an actuator or device has a plurality of movers for independently rotating drive in each direction, and a magnet for driving in each direction is provided on each of the movers.

[0011] Each of the plurality of movers needs relative rotational movement, and thus when the magnet provided on the mover is affected by a magnetic field caused by a magnet provided on another mover, or interference occurs between the magnetic fields of the magnets, an undesirable situation in which the position or posture of the carrier as the mover dynamically and irregularly changes over time can occur.

[0012] Therefore, such magnetic interference and the like can not only cause an error in the position sensing of each mover, but also can cause a decrease in the driving performance of the actuator itself due to a destruction of the linear relationship between the position sensing and the corresponding position control.

[0013] According to the embodiment, when a module for realizing an AF function or a zoom function is added to the camera actuator, a magnet for realizing AF and the like is also included, and thus the problem of mutual interference and the like caused by the magnetic field can further increase. SUMMARY

[0014] Technical Problem to be Solved

[0015] The present application has been made to solve the problems described above in the background art, and aims to provide a camera actuator which not only can increase the driving force by improving the structural relationship of the magnet and the back yoke, but also can minimize the magnetic field interference and the like between adjacent magnets.

[0016] Other objects and advantages of the present application can be understood by the following description, and will be apparent to those skilled in the art from the embodiments of the present application. The objects and advantages of the present application can be realized and attained by the structure described in the claims and combinations thereof.

[0017] Means for Solving the Problem

[0018] A camera actuator according to an embodiment of the present application for achieving the above object can be configured to include: a plurality of movers rotating in different directions from each other; a magnet provided on each of the plurality of movers; and a back yoke provided behind one or more of the magnets provided on each of the plurality of movers.

[0019] In this case, the back yoke of the present application is configured to include a cover portion that forms a gap with a side surface of a magnet provided in front of itself and covers the side surface.

[0020] Specifically, the cover portion of the present application is preferably configured to be provided in a direction in which magnets provided on the movers, which are different from each other by rotation of the movers, approach each other.

[0021] The camera actuator according to an embodiment of the present application can include a carrier to provide a reflector and to rotate in a first direction; an intermediate guide to rotate in a second direction perpendicular to the first direction; a first magnet provided to the carrier; a second magnet provided to the intermediate guide; and a back yoke provided behind one or more magnets among the first magnet and the second magnet,

[0022] In this case, the back yoke of the present application is configured to include a cover portion that forms a gap with a side surface of a magnet provided in front of itself and covers the side surface.

[0023] Preferably, the camera actuator of the present application can further include a housing to support rotation of the intermediate guide in the second direction, in which case the intermediate guide of the present application can be configured to support rotation of the carrier in the first direction and to rotate together with the carrier when rotating in the second direction.

[0024] In addition, the back yoke of the present application can include a first back yoke provided between the carrier and the first magnet, and a second back yoke provided between the intermediate guide and the second magnet, in which case one or more back yokes among the first back yoke or the second back yoke can include the cover portion.

[0025] Preferably, the cover portion of the present application is configured to be provided in a direction in which the first magnet and the second magnet approach each other by rotation in the first direction.

[0026] The camera actuator according to an embodiment of the present application can include a carrier to rotate in a first direction and to provide a reflector and a first magnet; an intermediate guide to rotate in a second direction perpendicular to the first direction and to provide a second magnet; a third carrier to move in an optical axis direction and to provide a third magnet; and a third back yoke provided between the third carrier and the third magnet.

[0027] In this case, the third back yoke of the present application includes a third cover portion that covers a side surface of the third magnet and forms a gap with the side surface of the third magnet.

[0028] Preferably, the third cover portion of the present application is configured in a direction in which the third magnet is brought close to the first magnet or the second magnet by movement in the optical axis direction of the third carrier.

[0029] The actuator for a camera according to an embodiment of the present application can include a carrier rotating in a first direction and configured to dispose a reflector and a first magnet; an intermediate guide rotating in a second direction perpendicular to the first direction and configured to dispose a second magnet; a third carrier moving in an optical axis direction and configured to dispose a third magnet; and a back yoke provided behind one or more magnets among the first magnet and the second magnet.

[0030] In this case, preferably, the back yoke can include a cover portion forming a gap with a side surface of a magnet disposed in front of itself and covering the side surface, the cover portion being configured in a direction in which the third magnet is brought close to the first magnet or the second magnet by movement in the optical axis direction of the third carrier.

[0031] Effects of the Invention

[0032] According to a preferred embodiment of the present application, by structural improvement of the back yoke that guides the magnetic field concentration of the magnet, not only the leaked magnetic field can be reduced, but also further enhanced driving force can be provided in the relationship between the magnet and the coil facing the magnet.

[0033] According to the present application, since the driving force can be enhanced based on the same specification of the magnet, the overall structure and shape of the actuator can be realized in a more compact form, so that not only the overall space can be minimized, but also the miniaturization of the mobile terminal and the like can be further optimized.

[0034] According to an embodiment of the present application, the magnetic field interference between the movers that stereoscopically rotate in a three-dimensional space and the like can be minimized, so that driving independence and operation reliability in each direction that operates in a subtle and precise manner can be more effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0035] The following drawings attached in the present specification illustrate preferred embodiments of the present application, and together with the detailed description of the present application described later, serve to make the technical idea of the present application more effectively understood, and thus the present application should not be construed as being limited to matters described in such drawings.

[0036] Figure 1 and Figure 2 is a view showing the overall configuration of an actuator for a camera and a camera module according to a preferred embodiment of the present application;

[0037] Figure 3 andFigure 4 is an exploded assembly view showing a detailed structure of an actuator for a camera according to a preferred embodiment of the present application;

[0038] Figure 5 is a view showing an action relationship when the reflector is rotated in a first direction;

[0039] Figure 6 is a view showing an action relationship when the reflector is rotated in a second direction;

[0040] Figure 7 and Figure 8 is an exploded assembly view showing a detailed structure of a carrier or intermediate guide for providing a back yoke;

[0041] Figure 9 is a view showing a structural relationship of a first back yoke and a first magnet;

[0042] Figure 10 is a view showing a structural relationship of a second back yoke and a second magnet;

[0043] Figure 11 and Figure 12 is a view showing a third carrier moving in an optical axis direction;

[0044] Figure 13 and Figure 14 is a view showing a structure of a third back yoke provided to the third carrier and a relationship with adjacent structures.

[0045] BRIEF DESCRIPTION OF DRAWINGS

[0046] 1000: camera module 1100: housing

[0047] 1200: circuit substrate 100 (700): actuator

[0048] 110: reflector 120: carrier

[0049] 121: first guide rail 125: mounting seat

[0050] 130: intermediate guide 131: first rail

[0051] 132: second rail 135: mounting seat

[0052] 140: housing 142: second guide rail

[0053] 150: yoke plate 170: back yoke

[0054] 170S: open portion

[0055] 210: third carrier 211: third rail

[0056] M1: First magnet; M2: Second magnet

[0057] M3: Third magnet; PM: Traction magnet

[0058] PM2: Second traction magnet; C1: First coil

[0059] C2: Second coil; C3: Third coil

[0060] B1: First ball bearing; B2: Second ball bearing

[0061] B3: Third ball bearing

[0062] 500A: First back yoke; 520A: First cover.

[0063] 500B: Second back yoke; 520B: Second cover.

[0064] 500C: Third back yoke; 520C: Third cover.

[0065] 511B: Open Department Detailed Implementation

[0066] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be interpreted as having the common or dictionary-defined meanings. Based on the principle that the inventors can appropriately define the concepts of terms in order to best describe their invention, they should be interpreted as having meanings and concepts consistent with the technical concept of the present invention.

[0067] Therefore, the embodiments described in this specification and the structures shown in the accompanying drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. It should be understood that there are many equivalents and modifications that can replace them for the purposes of this application.

[0068] Figure 1 and Figure 2 This is a diagram showing the overall structure of a camera actuator (hereinafter referred to as "actuator") 100 and a camera module 1000 including the actuator according to a preferred embodiment of the present invention.

[0069] It goes without saying that the actuator 100 of the present invention can be implemented as a standalone device, such as... Figure 1 As shown, it can also be implemented as a camera module 1000 including a lens drive module 200 that includes one or more lenses 50, 60, 70 and performs zoom and / or autofocus (AF), and an image sensor 30, etc. Furthermore, according to an embodiment, the actuator 100 of the present invention can be implemented in a form that includes the lens drive module 200.

[0070] In the case of the actuator 100 according to the present application, light of an object does not directly enter the lenses 50, 60, 70, but changes (refracts, reflects, etc.) a path of the light by the reflector 110 provided in the actuator 100 of the present application, and then enters the lenses 50, 60, 70.

[0071] As Figure 1 illustrated, a path of light entering from the outside is Zl, and a path of light entering the lenses 50, 60, 70 by being refracted or reflected by the reflector 110 is Z.

[0072] In the following description, a direction of a Z axis corresponding to a direction in which light enters the lenses 50, 60, 70 is referred to as an optical axis or an optical axis direction, and two directions perpendicular to the optical axis direction are referred to as an X axis and a Y axis.

[0073] An image sensor 30 such as a CCD, a CMOS, or the like, which converts an optical signal into an electric signal, can be provided at a rear end of the lenses 50, 60, 70 with the optical axis direction as a reference, and a filter for blocking or transmitting an optical signal of a specific frequency band can be provided together. It is needless to say that the lenses 50, 60, 70 can differ from the number and the position, etc. shown in the drawings, according to the embodiment.

[0074] As described in detail in the following description, the actuator 100 of the present application corresponds to a device that, when generating a shake due to a hand shake or the like with the X axis direction and / or the Y axis direction perpendicular to the optical axis as a reference, rotates and moves the reflector 110 in a direction to compensate for the movement, thereby realizing OIS with respect to the X axis direction and / or the Y axis direction.

[0075] As Figure 1 illustrated, the actuator 100 of the present application can be realized as a stand-alone device, and as a form combined with other devices constituting a camera module 1000, and not only that, as Figure 2 illustrated in FIG. 1, etc., can be realized as various forms including a form in which a housing 1100 included in the camera module 1000 is inside.

[0076] In this case, a housing 140 as a structure constituting the actuator 100 can be a housing of the actuator 100 itself or a housing 1100 of the camera module 1000, which is needless to say.

[0077] It is obvious that the shaft shown in the drawing, the terms referring to the shaft, and the upper, lower, front, rear, vertical, horizontal, and the like described with reference to the shaft are obviously only used to indicate the relative reference for explaining the embodiments of the present application, and are not used to specify a direction or position from an absolute reference, and the like, and can vary relatively depending on the position of the object as the subject or the position, view direction, and the like of the observer, which is self-evident.

[0078] In the following description, the embodiments of the present application are described with reference to the Z-axis as the up-down direction or the vertical direction, and the embodiments of the present application are described with reference to the Y-axis as the front or rear direction and the X-axis as the left or right direction from the corresponding angle.

[0079] In the case of referring to the actuator 100 according to an embodiment of the present application, as described later, the XZ plane or the plane corresponding to the XZ plane becomes the plane direction in which the carrier 120 rotates the intermediate guide 130 as the relative stator (see Figure 5 ), and the YZ plane becomes the plane direction in which the intermediate guide 130 of the present application rotates together with the carrier 120 with reference to the housing 140, 1100 (see Figure 6 ).

[0080] Figure 3 and Figure 4 is an exploded combined drawing showing the detailed structure of the actuator 100 according to a preferred embodiment of the present application.

[0081] As shown in FIGS. Figure 3 , the actuator 100 according to an embodiment of the present application can include a reflector 110, a carrier 120, an intermediate guide 130, and a housing 140. As described above, the housing 140 of the actuator 100 can be the housing 1100 of the camera module 1000 or the housing of a device in which the lens driving module 200 is integrated.

[0082] First, the overall structure of the actuator 100 will be described with reference to the drawings, and the detailed structure of the actuator 100 for OIS driving in each direction, the driving relationship, and the like will be described later.

[0083] As described above, if the light of the object incident along the Z1 path enters the actuator 100 of the present application, the reflector 110 of the present application changes the path of the light (refracts or reflects, etc.) to the optical axis direction Z and enters in the direction of the lenses 50, 60, 70.

[0084] The above-described reflector 110 can be one or a combination of a mirror and a prism selected from among them, and can be implemented by various components capable of changing the light entering from the outside to the optical axis direction, which is self-evident.

[0085] Thus, the present application is configured in a manner that the path of the light refracted by the reflector 110 is made to enter toward the lenses 50, 60, 70 after that, so that it is not necessary to arrange the lens driving module 200 itself along the thickness direction of the mobile terminal (smartphone, etc.), and thus even if an optical member having a physical characteristic long in the direction of the optical axis, such as a zoom lens, is mounted to the mobile terminal, the thickness of the mobile terminal is not increased, and the miniaturization of the mobile terminal, etc. can be optimized.

[0086] As is well known, OIS driving is achieved in a manner that the lens, etc. is moved in a direction to correct the shake caused by hand shake, and in the embodiment to which the present application is applied, unlike the method of moving the lens, etc. in the opposite direction, it is driven by moving the reflector 110.

[0087] The reflector 110 of the present application is arranged in the actuator 100 in the direction in which light enters, that is, in the direction toward the front in the Y-axis direction, and is fixedly arranged to the carrier 120, so that it performs its physical movement together with the carrier 120.

[0088] If the carrier 120 of the present application is rotationally moved (with the XZ plane as a reference) with the intermediate guide 130 as a reference (as a relative stator), or the intermediate guide 130 of the present application is rotationally moved (with the YZ plane as a reference) with the housing 140 as a reference (as a relative stator) together with the carrier 120, the reflector 110 arranged to the carrier 120 is also rotated in the same direction.

[0089] Preferably, first balls B1 can be arranged between the carrier 120 and the intermediate guide 130, and second balls B2 can be arranged between the intermediate guide 130 and the housing 140.

[0090] When such balls B1, B2 are interposed, the following advantages can be obtained: the mover can more flexibly perform linear movement by the minimized frictional force caused by the rolling, moving, rotation, point-contact with the facing object, etc. of the balls, not only the noise can be reduced and the driving force can be minimized, but also the driving accuracy, etc. can be improved.

[0091] As will be described later, in the case where the carrier 120 provided with the reflector 110 rotationally moves the intermediate guide 130 as a relative stator with the XZ plane as a reference (see Figure 5 ), by the rotational movement of the reflector 110, the path of the light entering toward the image sensor 30 is moved in the X-axis direction while correcting the X-axis direction component of the hand shake.

[0092] In addition, in a case where the carrier 120 provided with the reflector 110 is moved in rotation together with the intermediate guide 130 with the YZ plane as a reference (see Figure 6 ), the path of light entering the image sensor 30 is moved in the Y-axis direction while correcting the Y-axis direction component by the rotational movement of the reflector 110.

[0093] In the following description, the direction in which the reflector 110 is moved in rotation on a plane corresponding to the XZ plane is referred to as a "first direction" with respect to X-axis direction hand shake correction, and the direction in which the reflector 110 is moved in rotation on a plane corresponding to the YZ plane is referred to as a "second direction" with respect to Y-axis direction hand shake correction.

[0094] At this point, the intermediate guide 130 of the present application corresponds to a stator in the relative relationship with the carrier 120 with respect to rotational movement in the first direction, and corresponds to a mover in the relative relationship with the housing 140 with respect to rotational movement in the second direction.

[0095] As shown in Figure 3 and Figure 4 , a second magnet M2 for driving OIS in the second direction can be provided in the intermediate guide 130.

[0096] According to the embodiment, the above-described second magnet M2 can be provided in the intermediate guide 130 in a state in which a back yoke 170 for preventing magnetic force leakage and the like and concentrating magnetic force is interposed therebetween, to enhance the magnetic force between the second coil C2 and the second magnet M2.

[0097] A detailed description of the back yoke 170 provided at the rear of the second magnet M2, and the back yoke 500 provided in the magnet on the mover (carrier) moving in the optical axis direction (Z-axis direction) will be described later with reference to Figures 7 to 14 .

[0098] The pulling magnet PM of the present application is provided in a direction facing the second magnet M2 as a structure provided in the carrier 120, as shown in the drawing. When taking Figure 4 and the like as a reference, it is provided on the rear surface of the carrier 120 (with the Y-axis as a reference), and when taking the intermediate guide 130 as a reference, it is provided in front of the intermediate guide 130 (with the Y-axis as a reference).

[0099] The pulling magnet PM includes a magnetic pole opposite to a facing magnetic pole and facing a magnetic pole of the second magnet M2, which is a magnetic pole facing the pulling magnet PM direction among the magnetic poles of the second magnet M2. The counter magnetic-pole is arranged at a position corresponding to the facing magnetic pole with the default position of the carrier 120 as a reference.

[0100] The above-mentioned attraction magnet PM generates an attractive force to the second magnet M2, and the carrier 120 provided with the attraction magnet PM is drawn toward the intermediate guide 130.

[0101] The second magnet M2 is provided to the intermediate guide 130, and the attraction magnet PM is provided to the carrier 120, and thus if an attractive force is generated between the attraction magnet PM and the second magnet M2 as such, the carrier 120 is drawn toward the intermediate guide 130, and thus the carrier 120 in which the first ball B1 is sandwiched is in close contact with the intermediate guide 130.

[0102] Through such an attractive force relationship, point-contact or the like between the first ball B1 and the carrier 120 and between the first ball B1 and the intermediate guide 130 can be continuously maintained.

[0103] In addition, even if the carrier 120 is rotated with reference to the XZ plane by OIS driving in the first direction, if the OIS driving or the like ends or stops, the attraction magnet PM restores the position or posture of the carrier 120 to a position or posture in which the facing magnetic poles of the second magnet M2 and the reverse magnetic poles of the attraction magnet PM match or are orderly arranged to face each other.

[0104] Hereinafter, referring to Figure 5 and Figure 6 and the like, a detailed structure and driving relationship or the like of the actuator 100 for OIS driving in each direction will be described.

[0105] As illustrated, the first magnet M1 for driving OIS in the first direction is provided to the carrier 120 in which the reflector 110 is provided.

[0106] In order to improve driving efficiency or the like, as exemplified in the drawing, the first magnet M1 can be provided to the left and right side surfaces (M1-1, M1-2) of the carrier 120, respectively.

[0107] The first coil C1 facing the above-mentioned first magnet M1 is provided to the housing 140. In the case where a plurality of first magnets M1 is provided, the first coil C1 can also be provided as a plurality of coils (C1-1, C1-2).

[0108] If a magnetic force (electromagnetic force) is generated between the first coil C1 and the first magnet M1 by applying power of an appropriate size and direction to the first coil C1 by control of a driver (not shown) or the like, the carrier 120 is rotationally moved by the guidance of the first ball B1 in a state in which the intermediate guide 130 and the carrier 120 face each other in a plane vs. plane manner (see Figure 5), and the OIS in the X-axis direction, i.e., the OIS in the first direction, is achieved by such rotational movement. In this case, the rotational axis RA for the OIS in the first direction corresponds to the Y-axis.

[0109] As shown, a first ball B1 is arranged between the carrier 120 and the intermediate guide 130. This first ball B1 can be provided in the surface portion of the intermediate guide 130 facing the surface portion of the carrier 120, and arranged in a form in which a portion thereof is accommodated between the first rail 121 provided in the carrier 120 and the first track 131 having a circular shape (e.g., a raceway shape).

[0110] It is self-evident that one of the first track 131 and the first rail 121 can be implemented in a raceway shape in which a groove portion is continuous or partially continuous, and can also be implemented in a bag shape that prevents the first ball B1 from escaping to the outside.

[0111] According to the embodiment, the structure for driving control of the OIS can further include a sensing sensor. In this case, if the sensing sensor senses the position of the mounting carrier 120 (specifically, the first magnet M1 or a sensing magnet provided in the carrier 120, etc.) and transmits a signal corresponding thereto to the driver, the driver is controlled in such a manner that power of a size and direction corresponding thereto is applied to the first coil C1.

[0112] The above-described sensing sensor can be implemented with a hall sensor that senses a change in the magnetic field strength and direction of a magnet present in a sensing region using a hall effect and outputs an electrical signal corresponding thereto.

[0113] From a corresponding angle, if power of an appropriate size and direction is applied to the second coil C2 by control of the driver (not shown) or the like, a magnetic force (electromagnetic force) is generated between the second coil C2 and the second magnet M2, and the intermediate guide 130 rotates and moves in the second direction together with the carrier 120 with the housing 140 as a reference (as a relative stator) as a driving force of the generated magnetic force (see Figure 6 ).

[0114] In addition, as shown, a second track 132 having a circular shape is provided at the rear surface 130B (with the Y-axis as a reference) of the intermediate guide 130, and a second rail 142 is provided in the housing 140 facing the rear surface of the intermediate guide 130.

[0115] In this case, the second ball B2 can be disposed between the second rail 132 and the second guide rail 142. As illustrated in the drawing, the second rail 132 and / or the second guide rail 142 can be formed in a shape extending in a groove in a manner capable of accommodating a portion of the second ball B2, or a bag shape preventing the second ball B2 from escaping to the outside, which is self-evident.

[0116] The yoke plate 150 is provided to the housing 140, and generates an attractive force with the second magnet M2 provided to the intermediate guide 130, which functions as a stator with respect to the movement of the second direction of the intermediate guide 130.

[0117] By the attractive force between the yoke plate 150 and the second magnet M2, the point contact between the intermediate guide 130 and the second ball B2, and the second ball B2 and the housing 140, etc. can be continuously maintained.

[0118] In this case, the intermediate guide 130 is closely adhered to the housing 140 by the attractive force of the yoke plate 150, and the second rail 132 and the second guide rail 142 face each other due to the second ball B2 interposed therebetween, and a magnetic force is generated between the second coil C2 and the second magnet M2, and the intermediate guide 130 performs a rotational movement (rotation in the second direction) along the circular shape of the second rail 132 and / or the second guide rail 142 with the second ball B2 interposed therebetween.

[0119] When driving the rotation in the first direction, the intermediate guide 130 of the present application functions as a stator in the relative relationship with the carrier 120, and supports the rotational movement in the first direction of the carrier 120.

[0120] When driving the rotational movement in the second direction, the housing 140 of the present application functions as a stator in the relative relationship with the intermediate guide 130, and supports the rotational movement in the second direction of the intermediate guide 130.

[0121] As illustrated in the drawing, the first rail 131 formed in the intermediate guide 130 can be formed in a circular shape as a rail with the XZ plane as a reference, to guide the rotational movement in the first direction of the carrier 120. In the case of the second rail 132, it can be formed in a circular shape with the YZ plane as a reference, to guide the rotational movement in the second direction of the carrier 120 and the intermediate guide 130 together.

[0122] The first rail 131 and the second rail 132 are formed in directions perpendicular to each other, and are arranged in a state of accommodating the second ball B2 between the second rail 132 and the second guide rail 142, and thus, in a case where the carrier 120 rotates the intermediate guide 130 as a relative stator in the first direction by the guidance of the first guide rail 131 or the like, the second rail 132, the second ball B2, the second guide rail 142, or the like function as a physical structure that suppresses the rotational movement of the intermediate guide 130.

[0123] Due to this structural relationship, even if a magnetic force (electromagnetic force) is generated between the first magnet M1 and the first coil C1, the intermediate guide 130 can maintain a fixed position in relation to the housing 140.

[0124] From a corresponding perspective, in a case where a driving force is generated to the second magnet M2 by a magnetic force between the second magnet M2 and the second coil C2, the intermediate guide 130 is guided to rotate and move in the second direction (YZ plane) by the second rail 132, the second guide rail 142, and the second ball B2 or the like interposed therebetween.

[0125] In this case, the carrier 120 maintains a fixed position in relation to the intermediate guide 130 by the suppression structure based on the first rail 131, the first ball B1, and the first guide rail 121, and thus rotates together with the intermediate guide 130 in the second direction.

[0126] The first coil C1, the second coil C2, the Hall sensor, the driver, or the like can be mounted on a circuit board 1200 provided in the camera module 1000 or a circuit board provided in the actuator 100 itself. Preferably, the above-described circuit board 1200 can be configured in a state of being partially exposed to the outside to interface with an external module, a power unit, an external device, or the like.

[0127] The above-described first guide rail 121 and the first rail 131 function together with the first ball B1 to guide while physically supporting the rotation of the carrier 120 that rotates the intermediate guide 130 as a relative stator.

[0128] Therefore, in a case where the traction magnet PM is located in the middle portion of the rear surface of the carrier 120 and the first guide rail 121 is provided outside the traction magnet PM, not only can the tilt or the gap or the like of the carrier 120 be minimized, but also the rotation in the first direction of the carrier 120 can be made more stable.

[0129] If the reflector that reflects light of a subject in a lens direction is moved or rotated in the X-axis and Y-axis directions, that is, in directions different from each other, a mover having a physical structure or the like different from the embodiment of the present application described with reference to Figures 1 to 6 the mover can also be applied.

[0130] Figure 7 and Figure 8 This is an exploded view showing the detailed structure of the back yoke 500, specifically the carrier 120 on which the first back yoke 500A is provided, and the intermediate guide 130 on which the second back yoke 500B is provided.

[0131] The back yoke can be provided on the rear surface of the magnet, that is, on the opposite side of the surface of the magnet facing the coil. The back yoke functions to reduce magnetic leakage between the coil and the magnet and to enhance the magnetic force between the coil and the magnet.

[0132] like Figure 7 As shown, a first back yoke 500A is provided behind the first magnet M1 (in the opposite direction to the surface of the first magnet facing the first coil C1) to prevent magnetic leakage and enhance the magnetic force.

[0133] In order to enhance the driving force as described above, when the first magnet M1 is disposed on both sides of the carrier 120, the first back yoke 500A may also be disposed behind each of the first magnets M1 (500A1, 500A2).

[0134] As illustrated, a first mounting base 125 can be formed in the carrier 120 as a space for mounting the first magnet M1. The first magnet M1 can be disposed in the first mounting base 125 with the first back yoke 500A in between.

[0135] From the corresponding angle, a second mounting base 135 can be formed in the intermediate guide 130 as a space for mounting the second magnet M2. The second magnet M2 can be set in the intermediate guide 130 with the second back yoke 500B in between.

[0136] In order to improve the positional fixing force of magnets M1 and M2 and improve the efficiency of assembly processes such as alignment, preferably, as shown in the figure, the mounting bases 125 and 135 are configured to enter the interior of the carrier 120 or the intermediate guide 130 in such a way that their sides become a guide wall.

[0137] The aforementioned back yokes 500A and 500B, as components of magnetic material used to prevent magnetic leakage and magnetic force concentration, can be configured, according to the embodiment, to be partially or completely embedded in the mounting bases 125 and 135 by insert injection molding / forming or the like.

[0138] Specifically, the first back yoke 500A is located behind the first magnet M1 (within the distance). Figure 8(Based on the negative X-axis direction), it includes a main body plate 510A and a cover portion 520A serving as the body of the back yoke 500A. For relative distinction, the cover portion of the first back yoke 500A is referred to as the first cover portion 520A, and the cover portion of the second back yoke 500B is referred to as the second cover portion 520B.

[0139] The first cover portion 520A of the first back yoke 500A is configured to protrude from the main body plate 510A toward the first coil C1 and cover the side of the first magnet M1 by means of bending, joining, pressing, etc. The second back yoke 500B, located behind the second magnet M2, may also include the main body plate 510B and the second cover portion 520B, just like the first back yoke 500A.

[0140] The fact that the second back yoke 500B is located between the traction magnet PM and the second magnet M2 and is made of magnetic material may reduce the attraction and restoring force (reference position restoring force) between the traction magnet PM and the second magnet M2.

[0141] To effectively address this, such as Figure 7 and Figure 8 As shown, preferably, an opening 511B is formed in the area or part of the second back yoke 500B corresponding to the area where the second magnet M2 faces the traction magnet PM. Figure 3 The same applies to the back yoke 170 and the open portion 170S shown in the example.

[0142] Figure 9 This diagram illustrates the structural relationship between the first back yoke 500A and the first magnet M1. Figure 10 This diagram illustrates the structural relationship between the second back yoke 500B and the second magnet M2. Hereinafter, the specific structures of the back yokes 500A and 500B of the present invention will be described in detail with reference to the accompanying drawings.

[0143] The first cover portion 520A of the first back yoke 500A is configured to surround the side surface of the first magnet M1. Preferably, as shown in the figure, it is configured to be separated from the side surface of the first magnet M1 by a predetermined interval in such a way that gaps G1 and G2 are formed with the side surface of the first magnet M1.

[0144] The magnetic field of a magnet has the following characteristics: it has a curved shape and forms a three-dimensional space; when a magnetic body is present in an adjacent appropriate position, its magnetic field lines extend or expand toward the position of the magnetic body.

[0145] As illustrated, when the first cover portion 520A of the first back yoke 500A is provided so as to surround the side surface of the first magnet Ml with a gap therefrom, the magnetic field formed in the first magnet Ml extends toward the first cover portion 520A as the adjacent magnetic body, and the magnetic field extension phenomenon is induced to the entire three-dimensional space, and thus the electromagnetic force (magnetic force) can be increased in the relationship between the first magnet Ml and the facing first coil Cl.

[0146] From the corresponding viewpoint, preferably, the second cover portion 520B of the second back yoke 500B is also configured to form a gap G3, G4 from the side surface of the second magnet M2 and surround the side surface of the second magnet M2.

[0147] If the directivity and strength of the magnetic field generated by the first magnet Ml are thus improved, the leakage to the outside or the formation of the magnetic field in a direction other than the direction toward the coil can be suppressed, and thus the magnetic field interference in the relationship with the adjacent magnet can be reduced.

[0148] From this point, even if a small-sized magnet is used, a magnetic force (electromagnetic force) at the same level or above can be obtained compared to the same specification magnet, and thus the driving efficiency in the relationship with the coil can be improved.

[0149] The magnet is a constituent possessed by a mover (AF carrier, zoom carrier, OIS carrier, etc.), and thus, according to the embodiment of the present application, a relatively small-sized magnet can be used, and thus the weight of the mover can be reduced, and thus the driving efficiency can be further improved.

[0150] In addition, by using a relatively small-sized magnet, the magnetic field leakage itself can be reduced, and thus the magnetic field interference between the adjacent magnets can also be reduced.

[0151] From this point, preferably, the above-described cover portion 520A is provided in a direction in which the magnets provided on the movers that are different from each other by the rotation of the movers approach each other.

[0152] As described above, when the carrier 120 rotates the intermediate guide 130 as the relative stator in the first direction, the first magnet Ml also rotates, and thus the relative positional relationship of the first magnet Ml and the second magnet M2 dynamically changes.

[0153] Therefore, preferably, the first cover portion 520A of the first back yoke 500A and the second cover portion 520B of the second back yoke 500B described above are provided in a direction in which the first magnet Ml and the second magnet M2 approach each other by the rotation in the first direction.

[0154] Figure 11 and Figure 12 is a diagram illustrating the third carrier 210 moving in the optical axis direction, Figure 13 andFigure 14 is a diagram illustrating the structure of the third back yoke 500C provided to the third carrier 210 and the relationship with the adjacent structure.

[0155] According to Figure 11 The actuator 700 according to the embodiment shown in FIGS. 1 to 3 can be configured to further include the lens driving module 200 that moves along the optical axis as described above.

[0156] The lens driving module 200 can include the third carrier 210 that linearly moves in the optical axis direction (Z-axis direction), and one or more lenses 60, 70 mounted to the third carrier 210.

[0157] The third carrier 210 that moves in the optical axis direction is provided with a third magnet M3 that faces a third coil provided in the housing 140 or the like. As described above, in order to enhance the magnetic force, reduce the magnetic force leakage, and the like, it is preferable that the third magnet M3 be provided to the third carrier 210 with the third back yoke 500C interposed therebetween.

[0158] It is preferable that a third ball B3 be arranged between the third carrier 210 and the housing 140. When such a third ball B3 is interposed therebetween, the third carrier 210, which is a mover, can more flexibly perform linear movement with the housing 140 as a stator by the minimized frictional force caused by the rolling, moving, rotation, point-contact with the facing object, and the like of the ball, and can not only reduce noise and minimize the driving force, but also improve the driving accuracy and the like.

[0159] The third ball B3 can be arranged in a form in which a portion thereof is accommodated in a track (not shown) formed on a surface portion of the housing 140 that faces the third carrier 210 and / or a third track 211 formed on the third carrier 120, to effectively guide the linear movement of the third carrier 210.

[0160] In addition, a second traction magnet PM2 that generates an attractive force with a yoke plate (not shown) of a magnetic material provided to the housing 140 can be provided to the third carrier 210.

[0161] In the mutual relationship of the magnetic force, the second traction magnet PM2 can also be provided to the housing 140 as a stator, and a magnet or a component of a magnetic material that generates an attractive force therewith can also be provided to the third carrier 210, which is self-evident.

[0162] If an attractive force is generated between the yoke plate and the second traction magnet PM2 as described above, since the third carrier 210 is in close contact in a state where the third ball B3 is interposed therebetween toward the housing 140 direction, it is possible to continuously maintain the point-contact between the third ball B3 and the third carrier 210 and between the third ball B3 and the housing 140, and the like.

[0163] If an appropriate size and direction of current is supplied to the third coil C3 by driving of an external control signal or an internal algorithm, or the like, an electromagnetic force (magnetic force) is generated between the third coil C3 and the third magnet M3, and the third carrier 210 in which the third magnet M3 is provided is moved in the optical axis direction by the electromagnetic force.

[0164] As with the first back yoke 500A and the second back yoke 500B, a third back yoke 500C for enhancing the magnetic force of the third magnet M3 and preventing leakage of the magnetic force can be provided at the rear of the third magnet M3 (between the third carrier 210 and the third magnet M3).

[0165] Preferably, the third back yoke 500C is configured to include a third cover portion 520C that covers the side surface of the third magnet M3 and forms a gap G5 with the side surface of the third magnet M3, as with the first back yoke 500A and / or the second back yoke 500B described above. Figure 13 And Figure 14 The reference numeral 510C of the drawing corresponds to the main plate of the third back yoke 500C.

[0166] If the third carrier 210 is moved upward in the optical axis direction, the third magnet M3 provided in the third carrier 210 approaches the first magnet M1 or the second magnet M2 located at the upper portion (with reference to the Z-axis direction) of the third carrier 210, and thus magnetic force interference can occur between these magnets (the first magnet M1 and the third magnet M3, or the second magnet M2 and the third magnet M3).

[0167] Therefore, preferably, the third cover portion 520C described above is provided in a direction in which the third magnet M3 approaches the first magnet M1 or the second magnet M2 by movement of the third carrier 210 in the optical axis direction. When the embodiment shown in the drawing is taken as a reference, preferably, the third cover portion 520C is provided at the upper portion (with reference to the optical axis) of the third magnet M3.

[0168] From a corresponding perspective, preferably, the first cover portion 520A or the second cover portion 520B of the first back yoke 500A is provided in a direction in which the third magnet M3 approaches the first magnet M1 or the second magnet M2 by movement of the third carrier 210 in the optical axis direction.

[0169] The present application has been described above by way of limited embodiments and drawings, but the present application is not limited thereto, and it is self-evident that various modifications and changes can be made by those skilled in the art within the technical scope of the present application and the equivalent scope of the claims described below.

[0170] In order to emphasize or highlight the technical content of the present application, the accompanying drawings attached for the illustration of the description and embodiments of the present application, etc. can be shown in a slightly exaggerated form, but it is self-evident that various modified application examples can be made on the level of those skilled in the art considering the foregoing and matters shown in the drawings, etc.

[0171] In addition, in the description of the present application, expressions such as first, second, or upper, lower, or up and down, etc. are merely terms of tool concepts used for relatively distinguishing constituent elements from each other, and thus are not terms used to indicate a specific order, priority, etc., or terms used to physically distinguish each constituent in an absolute basis, which is self-evident.

Claims

1. An actuator for a camera, characterized in that, include: Multiple movers rotate in different directions from each other; Magnets are respectively disposed on the plurality of moving parts; as well as The back yoke is located behind one or more magnets respectively disposed on the plurality of movers. The back yoke includes a cover that forms a gap with the side of a magnet located in front of it and covers the side.

2. The camera actuator according to claim 1, characterized in that, The cover is positioned in a direction in which magnets mounted on the different movers are brought closer to each other by the rotation of the movers.

3. An actuator for a camera, characterized in that, include: A carrier for mounting a reflector and rotating along a first direction; The intermediate guide rotates along a second direction perpendicular to the first direction; A first magnet is disposed on the carrier; A second magnet is disposed on the intermediate guide; as well as A back yoke is provided behind one or more of the first and second magnets. The back yoke includes a cover that forms a gap with the side of a magnet located in front of it and covers the side.

4. The camera actuator according to claim 3, characterized in that, It also includes a housing that supports rotation of the intermediate guide in the second direction. The intermediate guide supports the rotation of the carrier in the first direction and rotates together with the carrier when rotating in the second direction.

5. The camera actuator according to claim 3, characterized in that, The back yoke includes: A first back yoke is provided between the carrier and the first magnet; and A second back yoke is provided between the intermediate guide and the second magnet. One or more of the first or second back yokes includes the cover portion.

6. The camera actuator according to claim 3, characterized in that, The cover is positioned in a direction in which the first magnet and the second magnet move closer to each other by rotation in the first direction.

7. An actuator for a camera, characterized in that, include: The carrier rotates along a first direction and is used to set the reflector and the first magnet; An intermediate guide member rotates along a second direction perpendicular to the first direction and is used to set the second magnet; The third carrier moves along the optical axis and is used to set the third magnet; and The third back yoke is provided between the third carrier and the third magnet. The third back yoke includes a third cover portion that covers the side of the third magnet and forms a gap with the side of the third magnet.

8. The camera actuator according to claim 7, characterized in that, The third cover is positioned in a direction in which the third magnet moves closer to the first magnet or the second magnet due to movement along the optical axis of the third carrier.

9. An actuator for a camera, characterized in that, include: The carrier rotates along a first direction and is used to set the reflector and the first magnet; An intermediate guide member rotates along a second direction perpendicular to the first direction and is used to set the second magnet; The third carrier moves along the optical axis and is used to set the third magnet; and A back yoke is provided behind one or more of the first and second magnets. The back yoke includes a cover that forms a gap with the side of the magnet located in front of it and covers the side. The cover is positioned in a direction that allows the third magnet to approach the first magnet or the second magnet through movement along the optical axis of the third carrier.

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