Reflector actuator

Abstract

A reflector actuator according to one embodiment of the present invention comprises: a carrier on which a reflector is mounted and on which a first magnet is provided; an intermediate guide supporting rotation in a first direction of the carrier; a first ball disposed between the carrier and the intermediate guide; a second magnet provided to the intermediate guide; the traction magnet is arranged on the carrier and is arranged in a direction facing the second magnet; and a first coil that provides a driving force to the first magnet, in which case the traction magnet includes a counter magnetic pole that is opposite to a facing magnetic pole of the magnetic poles of the second magnet toward the traction magnet direction.

Description

Technical Field

[0001] The present invention relates to a reflector actuator, and more particularly, to a reflector actuator that improves driving accuracy by applying a position recovery function. Background Art

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

[0003] The autofocus (auto focus) function is a function of adjusting the focal distance with the subject by linearly moving a carrier equipped with a lens etc. along the optical axis, thereby generating a clear image in an image sensor (CMOS, CCD, etc.) provided at the rear end of the lens.

[0004] The optical image stabilization function is a function for improving the clarity of an image by adaptively moving a carrier carrying the lens (or image sensor) in a direction to compensate for the shaking of the lens or image sensor due to hand shaking.

[0005] One of the representative methods for realizing the autofocus function or the OIS function is to set a magnet (coil) on a movable body (carrier), and set a coil (magnet) on a fixed body (shell, base or other form of carrier, etc.), and then generate a driving force between the coil and the magnet, so that the movable body moves along the optical axis direction or in a direction perpendicular to the optical axis.

[0006] On the other hand, recent mobile terminals are equipped with zoom lenses, etc., which have more specifications and can adjust the focal length in a variety of ways, or can capture images at a long distance, etc., so as to meet higher user needs and realize user convenience in a more diverse manner.

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

[0008] Recently, an actuator or camera module has been disclosed, which has a physical structure of refracting light of a subject using a reflector provided at the front end of a lens, so as to organically combine the physical characteristics of such a zoom lens with the geometric features of a portable terminal.

[0009] Such actuators, etc., that use a reflector, which reflects light from a subject toward the lens, implement OIS by moving the reflector in one or two axes when shake occurs.

[0010] In this case, a structure is mainly adopted in which a moving body provided with a reflector rotates and moves along a track while being supported by balls. In this structure, in order to maintain contact force or adhesion force with the balls, a yoke made of a magnetic material that generates attraction with a magnet is provided.

[0011] With this structure, the movable body using the balls as a medium is pulled toward the fixed body due to the attraction of the yoke, thereby maintaining not only the contact force between the movable body and the balls but also the contact force between the fixed body and the balls.

[0012] However, in the case of a device or actuator using a reflector, unlike the conventional OIS which implements OIS through linear movement, OIS is implemented through rotational movement of the reflector. Therefore, when OIS driving ends, the reflector stops at a specific position where OIS driving ends, and this position becomes a random position.

[0013] That is, the yoke of the conventional actuator can only provide a close contact force (attractive force), but cannot return the reflector or the movable body (carrier, etc.) provided with the reflector to a specified specific reference position. In this regard, in the case of the conventional actuator, when implementing OIS driving, it is necessary to first perform processing for grasping the current position of the reflector, so that the timely responsiveness is reduced and the driving accuracy is also reduced. Summary of the invention

[0014] Technical issues to be solved

[0015] The present invention is a solution to the problems described in the above background, and its purpose is to provide a reflector actuator, which, through a structure in which the magnetic pole and the anti-magnetic pole face each other, can not only provide a close contact force between a moving body and a fixed body, but also simultaneously provide a restoring force for the moving body to return to a specific reference position, thereby not only improving the response speed of OIS, but also improving the driving accuracy.

[0016] Other purposes and advantages of the present invention will be understood through the following description and will be more clearly understood through the embodiments of the present invention.In addition, the purposes and advantages of the present invention can be achieved through the structures and combinations of structures appearing in the claims.

[0017] Means of solving the problem

[0018] According to an embodiment of the reflector brake of the present invention for achieving the above-mentioned purpose, it can be constructed to include: a carrier, on which a reflector is mounted and a first magnet is provided; an intermediate guide, which supports the carrier to rotate in a first direction; a first ball, which is arranged between the carrier and the intermediate guide; a second magnet, which is arranged on the intermediate guide; a traction magnet, which is arranged on the carrier and in a direction facing the second magnet; and a first coil, which provides driving force to the first magnet.

[0019] In this case, the pulling magnet of the present invention may be configured to include an anti-magnetic pole that is opposite to the facing magnetic pole of the second magnet that faces the pulling magnet.

[0020] In addition, the counter magnetic pole of the present invention is preferably configured to be provided at a position corresponding to the facing magnetic pole.

[0021] Preferably, the pulling magnet of the present invention may have a shape extending in a direction corresponding to the length direction of the second magnet.

[0022] Here, the first direction rotation of the present invention is preferably configured such that the carrier is realized in a plane parallel to a direction facing the intermediate guide.

[0023] In addition, the reflector brake of an embodiment of the present invention may further include: a housing supporting the second direction rotation of the intermediate guide; a second ball disposed between the intermediate guide and the housing; and a second coil providing a driving force to the second magnet.

[0024] Preferably, the present invention may further include a back yoke, which is arranged on the intermediate guide and in the opposite direction of the second magnet toward the second coil. In this case, the back yoke of the present invention may be constructed to have an opening portion formed at a position corresponding to the area facing the second magnet and the traction magnet.

[0025] Furthermore, the pulling magnet of the present invention is preferably configured such that, based on a surface portion facing the second magnet, an outer width thereof is larger than an inner width thereof.

[0026] Effects of the Invention

[0027] According to a preferred embodiment of the present invention, the attractive force is generated by the corresponding magnetic pole relationship, so that not only the close contact force between the moving body and the fixed body can be achieved, but also the reference position restoring force of the moving body can be achieved at the same time.

[0028] In particular, according to the present invention, the rotational movement of the reflector is guided by utilizing the gravitational relationship between the magnetic pole and the anti-magnetic pole, whereby the reflector can return to the reference position, thereby providing an actuator structure optimized for achieving OIS through the rotational movement of the reflector.

[0029] According to a preferred embodiment of the present invention, by virtue of the physical shape of the pulling magnet having an outer width relatively larger than an inner width, it is possible to more effectively generate torque for rotational movement even without reducing the attraction force.

[0030] In addition, according to the present invention, the magnet used for OIS driving can be directly used as a magnet that generates an attractive force with the pulling magnet, so that the structural design can be realized more simply.

[0031] Furthermore, by improving the structure of the back yoke for concentrating magnetic force or preventing magnetic force leakage, etc., not only the driving force of the driving magnet can be increased, but also the efficiency of the attractive force and restoring force generated by the pulling magnet can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the present invention described later, serve to more effectively understand the technical ideas of the present invention. Therefore, the present invention should not be interpreted as being limited to the matters recorded in such drawings.

[0033] Figure 1 is a diagram showing the overall structure of a reflector actuator and a camera module according to a preferred embodiment of the present invention;

[0034] Figure 2 is a diagram showing the overall structure of a reflector actuator and a camera module according to a preferred embodiment of the present invention;

[0035] Figure 3 is an exploded view showing a detailed structure of a reflector actuator according to a preferred embodiment of the present invention;

[0036] Figure 4 is an exploded view showing a detailed structure of a reflector actuator according to a preferred embodiment of the present invention;

[0037] Figure 5 is a diagram illustrating the action relationship of the reflector rotating and moving along the first direction;

[0038] Figure 6 is a diagram illustrating the action relationship of the reflector rotating and moving along the second direction;

[0039] Figure 7 is a diagram illustrating the action relationship of the traction magnet;

[0040] Figure 8 is a diagram illustrating the action relationship of the traction magnet;

[0041] Fig. 9 is a diagram showing the structure of a pulling magnet according to another embodiment of the present invention;

[0042] Fig.10 is a diagram showing the structure of a pulling magnet according to another embodiment of the present invention;

[0043] Fig.11 FIG. 1 is a diagram showing a reflector actuator according to another preferred embodiment of the present invention.

[0044] Description of Reference Numerals

[0045] 1000: Camera module 1100: Housing

[0046] 1200: Circuit board

[0047] 100: Actuator

[0048] 110: reflector 120: carrier

[0049] 121: First guide 130: Intermediate guide

[0050] 131: First track 132: Second track

[0051] 140: housing 142: second guide

[0052] 150: yoke plate 170: rear yoke

[0053] 170S: Open Department

[0054] M1: first magnet M2: second magnet

[0055] PM: traction magnet M3: driving magnet

[0056] C1: First coil C2: Second coil

[0057] B1: first ball B2: second ball DETAILED DESCRIPTION

[0058] Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms or words used in this specification and claims cannot be interpreted as the commonly used or dictionary-defined meanings, and should be interpreted as the meanings and concepts that conform to the technical ideas of the present invention based on the principle that the inventor can appropriately define the concepts of the terms in order to explain his invention in the best way.

[0059] 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 cannot represent the entire technical concept of the present invention. It is understandable that there may be a variety of equivalents and modifications that can replace them for this application.

[0060] Figure 1 and Figure 2 1 is a diagram showing the overall structure of a reflector actuator (hereinafter, referred to as “actuator”) 100 and a camera module 1000 including the actuator according to a preferred embodiment of the present invention.

[0061] It goes without saying that the actuator 100 of the present invention can be implemented as a single device, such as Figure 1 As shown in FIG. 1 , the camera module 1000 may be implemented as a camera module 1000 including one or more lenses 50 , 60 , 70 , a lens driving module 200 for realizing zoom and / or auto focus (AF), and an image sensor 30 .

[0062] In the case of the actuator 100 according to the present invention, the light of the subject does not directly enter the lenses 50, 60, 70, but enters the lenses 50, 60, 70 after the path of the light is changed (refracted, reflected, etc.) by the reflector 110 provided in the actuator 100 of the present invention.

[0063] like Figure 1 As illustrated, the path of light entering from the outside is Z1, and the path of light incident from the outside is refracted or reflected by the reflector 110 and incident on the lenses 50, 60, 70 is Z.

[0064] In the following description, the Z-axis direction corresponding to the direction in which light is incident on the lenses 50 , 60 , 70 is referred to as the optical axis or optical axis direction, and two directions perpendicular to the optical axis direction are referred to as the X-axis direction and the Y-axis direction.

[0065] An image sensor 30 such as a CCD or CMOS that converts an optical signal into an electrical signal may be provided at the rear end of the lenses 50, 60, and 70 based on the optical axis direction, and a filter for blocking or transmitting an optical signal of a specific wavelength band may be provided together. It is self-evident that the number and position of the lenses 50, 60, and 70 may be different from the number and position shown in the drawings according to the embodiment.

[0066] As described in detail later, the actuator 100 of the present invention is equivalent to a device that realizes OIS relative to the X-axis direction and / or the Y-axis direction by rotating the reflector 110 in a direction to compensate for the movement when jitter caused by hand shaking or the like occurs with respect to the X-axis direction and / or the Y-axis direction perpendicular to the optical axis.

[0067] like Figure 1 As shown in the example, the actuator 100 of the present invention can be implemented as an independent device, or in a form combined with other devices constituting the camera module 1000. Figure 2 As exemplified in the above, the camera module 1000 may be implemented in various forms including a form included in the housing 1100 of the camera module 1000 .

[0068] In this case, it goes without saying that the housing 140 , which is one component constituting the actuator 100 , may be the housing of the actuator 100 itself or the housing 1100 of the camera module 1000 .

[0069] The axes shown in the drawings, the terms representing the axes, and the terms such as upper, lower, front, rear, vertical, and horizontal described with reference to the axes are merely used to indicate relative references for describing the embodiments of the present invention, and are not used to specify a direction or position of a certain party from an absolute reference. Of course, they may also be relatively different depending on the position of the object being the subject or the position of the observer, the viewing direction, etc.

[0070] In the following description, the embodiments of the present invention are described with the Z axis as the reference for the up-down direction or the vertical direction. From a corresponding point of view, the embodiments of the present invention are described with the Y axis as the reference for the front or rear direction and the X axis as the reference for the left or right direction.

[0071] In the case of the actuator 100 according to an embodiment of the present invention as a reference, the XZ plane or a plane corresponding to the XZ plane described later becomes the plane direction in which the carrier 120 rotates relative to the fixed body with the center guide 130 as the center guide 130 (see Figure 5 ), the YZ plane becomes the plane direction in which the intermediate guide 130 of the present invention rotates with the carrier 120 based on the housing 140 and 1100 (see Figure 6 ).

[0072] Figure 3 and Figure 4 1 is an exploded view showing a detailed structure of an actuator 100 according to a preferred embodiment of the present invention.

[0073] like Figure 3 As shown in FIG. 1 and FIG. 2 , the actuator 100 according to an embodiment of the present invention may 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 may be the housing 1100 of the camera module 1000.

[0074] 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 and the relationship of the driving pipe will be described later.

[0075] As described above, when the light of the subject incident along the Z1 path enters the actuator 100 of the present invention, the reflector 110 of the present invention changes the path of the light in the optical axis direction Z (refracts or reflects, etc.) and makes the light incident in the direction of the lenses 50, 60, 70.

[0076] It goes without saying that the reflector 110 may be one selected from a mirror and a prism or a combination thereof, and may also be implemented by various elements that can change the light incident from the outside in the direction of the optical axis.

[0077] In this way, the present invention is constructed such that the path of light is refracted by the reflector 110 and then the light is incident on the lenses 50, 60, and 70, so that the lens driving module 200 itself does not need to be installed along the thickness direction of the mobile terminal (for example, a smart phone, etc.). Therefore, even if an optical component having a long physical property along the optical axis direction such as a zoom lens is installed on the mobile terminal, the thickness of the mobile terminal will not be increased, thereby optimizing the miniaturization of the mobile terminal.

[0078] As is well known, OIS driving is achieved by moving a lens, etc. along a direction to correct the shake caused by hand shake. In an embodiment to which the present invention is applicable, unlike the method of moving the lens, etc. in the opposite direction, OIS can be driven by moving the reflector 110.

[0079] The reflector 110 of the present invention is disposed in the direction of light entry, that is, in the front direction of the Y-axis direction, in the actuator 10 , and is fixedly disposed on the carrier 120 , so that it physically moves together with the carrier 120 .

[0080] When the carrier 120 of the present invention rotates and moves (with the XZ plane as the reference) with the intermediate guide 130 as the reference (as a relatively fixed body) or the intermediate guide 130 of the present invention rotates and moves (with the YZ plane as the reference) together with the carrier 120 with the shell 140 as the reference (as a relatively fixed body), the reflector 110 arranged in the shell 120 also rotates in the same direction.

[0081] Preferably, a first rolling ball B1 may be disposed between the carrier 120 and the intermediate guide 130 , and a second rolling ball B2 may be disposed between the intermediate guide 130 and the housing 140 .

[0082] When such balls B1 and B2 are in between, the minimized friction caused by the rolling, moving, rotation, and point contact with the facing object of the balls can have the following advantages: the moving body can move linearly more flexibly, which can not only reduce noise and minimize driving force, but also improve driving accuracy, etc.

[0083] As described later, when the carrier 120 provided with the reflector 110 is rotated and moved relative to the intermediate member 130 with the XZ plane as a reference (see Figure 5 ), by the rotational movement of the reflector 110, the path of the light incident on the image sensor 30 side moves along the X-axis direction while correcting the hand shake of the X-axis direction component.

[0084] In addition, when the carrier 120 provided with the reflector 110 is rotated and moved together with the intermediate guide 130 with reference to the YZ plane (see Figure 6 ), by the rotational movement of the reflector 110, the path of the light incident on the image sensor 30 moves along the Y-axis direction while correcting the hand shake of the Y-axis component.

[0085] In the following description, with respect to X-axis hand shake correction, the direction in which the reflector 110 rotates and moves along the plane corresponding to the XZ plane is referred to as the "first direction", and with respect to Y-axis hand shake correction, the direction in which the reflector 110 rotates and moves along the plane corresponding to the YZ plane is referred to as the "second direction".

[0086] In this regard, the intermediate guide 130 of the present invention serves as a fixed body in relation to the carrier 120 for the rotational movement in the first direction, and serves as a movable body in relation to the housing 140 for the rotational movement in the second direction.

[0087] like Figure 3 and Figure 4 As shown, a second magnet M2 for driving the second direction OIS may be provided on the intermediate guide 130 .

[0088] According to an embodiment, the second magnet M2 may be provided on the intermediate guide 130 with the back yoke 170 provided to prevent magnetic force leakage and concentrate magnetic force so as to strengthen the magnetic force between the second coil C2 and the second magnet M2 .

[0089] The pulling magnet PM, which is one of the core structures of the present invention, is a structure provided on the carrier 120, and is provided in a direction facing the second magnet M2 as shown in the figure. Figure 4When the Y axis is used as a reference, it is disposed at the rear of the carrier 120 (based on the Y axis), and when the intermediate guide 130 is used as a reference, it is disposed in front of the intermediate guide 130 (based on the Y axis).

[0090] The pulling magnet PM includes a magnetic pole (hereinafter referred to as a "counter magnetic pole") having a polarity opposite to that of the facing magnetic pole and facing the facing magnetic pole, and the facing magnetic pole is a magnetic pole of the second magnet M2 that faces the pulling magnet PM. The counter magnetic pole is arranged at a position corresponding to the facing magnetic pole with respect to the default position (reference position) of the carrier 120.

[0091] The pulling magnet PM generates an attractive force on the second magnet M2 , so that the carrier 120 including the pulling magnet PM comes into close contact with the intermediate guide 130 .

[0092] The second magnet M2 is disposed on the intermediate guide 130, and the traction magnet PM is disposed on the carrier 120. Therefore, an attractive force is generated between the traction magnet PM and the second magnet M2, and the carrier 120 is pulled toward the intermediate guide 130. Therefore, the carrier 120 provided with the first ball B1 is in close contact with the intermediate guide 130.

[0093] For reference, when the actuator 100 of the present invention is implemented in an embodiment that drives only the first direction OIS, it is self-evident that the second magnet M2 can be provided on a fixed body such as the housing 140 that is not a moving body. Therefore, in such an embodiment, the intermediate guide 130 only functions as a fixed body in a relative relationship with the carrier 120.

[0094] According to this attractive force relationship, not only the point-contact between the first rolling ball B1 and the carrier 120 but also the point-contact between the first rolling ball B1 and the intermediate guide 130 can be continuously maintained.

[0095] In addition, even if the carrier 120 rotates based on the XZ plane due to the drive of the first direction OIS, if the OIS drive is ended or terminated, the traction magnet PM will restore the position or posture of the carrier 120 to a position or posture in which the facing pole of the second magnet M2 matches or is aligned with the anti-magnetic pole of the traction magnet PM.

[0096] Further references below Figure 5 and Figure 6 , describing the detailed structure and driving relationship of the actuator 100 used for OIS driving in various directions.

[0097] As shown in the drawings, a first magnet M1 for driving the first direction OIS is disposed on the carrier 120 where the reflector 110 is disposed. To improve driving efficiency, the first magnet M1 can be disposed on the left and right sides of the carrier 120 (M1-1, M1-2), respectively.

[0098] The housing 140 is provided with a first coil C1 facing the first magnet M1. When a plurality of first magnets M1 are provided, a plurality of first coils C1 are also provided (C1-1, C1-2).

[0099] When a power source of appropriate size and direction is applied to the first coil C1 by the control of a driver (not shown) and a magnetic force (electromagnetic force) is generated between the first coil C1 and the first magnet M1, the carrier 120 rotates and moves under the guidance of the first ball B1 in a plane-to-plane state with the intermediate guide 130 (see Figure 5 ), the X-axis direction OIS, that is, the first direction OIS is realized by this rotational movement. In this case, the rotation axis RA of the first direction OIS corresponds to the Y-axis.

[0100] As shown in the drawings, the first ball B1 is arranged between the carrier 120 and the intermediate guide 130. The first ball B1 can be arranged in the following form: it is arranged on the surface of the intermediate guide 130 facing the carrier 120, and a part of the first ball B1 is accommodated between the first track 13 having a circular shape (for example, a guide rail shape) and the first guide 121 provided on the carrier 120.

[0101] One of the first rail 13 and the first guide 121 may be implemented not only in a rail shape in which a groove portion is continuous or partially continuous, but also in a pocket shape that prevents the first rolling ball B1 from escaping to the outside.

[0102] According to an embodiment, the structure for driving and controlling the OIS may further include a sensing sensor. In this case, when the sensing sensor detects the position of the carrier 120 (specifically, the first magnet M1 or the sensing magnet disposed on the carrier 120) and transmits a corresponding signal to the driver, the driver controls the first coil C1 by applying a power supply of a corresponding magnitude and direction.

[0103] The above-mentioned sensing sensor can be implemented by a Hall sensor, which uses the Hall effect to sense changes in the magnetic field strength and direction of a magnet in a sensing area and outputs an electrical signal corresponding thereto.

[0104] From a corresponding perspective, if a power source of appropriate size and direction is applied to the second coil C2 through the control of a driver (not shown), a magnetic force (electromagnetic force) is generated between the second coil C2 and the second magnet M2, and the intermediate guide 130 uses the generated magnetic force as a driving force to rotate and move in the second direction together with the carrier 120 with the housing 140 as a reference (as a relatively fixed body) (see Figure 6 ).

[0105] As shown in the drawings, a circular second rail 132 is provided at the rear 130B (with the Y axis as a reference) of the intermediate guide 130 , and a second guide 142 is provided at the housing 140 facing the rear of the intermediate guide 130 .

[0106] In this case, the second ball B2 may be disposed between the second rail 132 and the second guide 142. As illustrated in the drawings, the second rail and / or the second guide 142 may be formed in a shape having a groove extending to accommodate a portion of the second ball B2, or in a bag shape to prevent the second ball B2 from escaping to the outside.

[0107] The yoke plate 150 is provided on the housing 140 that functions as a relatively fixed body with respect to the movement of the intermediate guide 130 in the second direction, and generates an attractive force with the second magnet M2 provided on the intermediate guide 130 .

[0108] By the attractive force between the yoke plate 150 and the second magnet M2 , point contact between the intermediate guide 130 and the second ball bearings and between the second ball bearings B2 and the housing 140 , etc. may be continuously maintained.

[0109] In this way, the intermediate guide 130 is tightly attached to the shell 140 through the attraction of the yoke plate 150, and the second track 132 provided with the second ball B2 and the second guide 14 face each other. Therefore, when the magnetic force is generated between the second coil C2 and the second magnet M2, the intermediate guide 130 rotates and moves along the circular shape of the second track 132 provided with the second ball B2 and / or the second guide 14 (rotates in the second direction).

[0110] When the first direction rotational movement is driven, the intermediate guide 130 of the present invention functions as a fixed body in a relative relationship with the carrier 120, and supports the first direction rotational movement of the carrier 120. In addition, when the second direction rotational movement is driven, the housing 140 of the present invention functions as a fixed body in a relative relationship with the intermediate guide 130, and supports the second direction rotational movement of the intermediate guide 130.

[0111] As shown in the drawings, the first rail 131 formed on the intermediate guide 130 may be formed in a circular shape with the XZ plane as the reference, which is the same as the guide rail, to guide the first direction rotation movement of the carrier 120. In the case of the second rail 132, it may be formed in a circular shape with the YZ plane as the reference, to guide the second direction rotation movement of the intermediate guide 130 together with the carrier 120.

[0112] The first rail 131 and the second rail 132 are formed in a perpendicular direction to each other, and the second rail 132 and the second guide 142 are arranged in a form in which the second ball B2 is accommodated. Therefore, when the carrier 120 rotates the intermediate guide 130 as a relative fixed body in the first direction through the guidance of the first rail 13, etc., the second rail 132, the second ball B2, the second guide 142, etc. function as a physical structure to suppress the rotational movement of the intermediate guide 130.

[0113] According 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 relationship with the housing 140 .

[0114] From a corresponding point of view, when a driving force is generated in the second magnet M2 through the magnetic force between the second magnet M2 and the second coil C2, the intermediate guide 130 rotates and moves along the second direction (YZ plane) through the guidance of the second track 132, the second guide 142 and the second ball B2 therebetween.

[0115] In this case, the carrier 120 is held in a fixed position in relation to the intermediate guide 130 by the restraining structure formed by the first rail 13 , the first ball B1 , and the first guide 121 , and thus rotates in the second direction together with the intermediate guide 130 .

[0116] The first coil C1, the second coil C2, the Hall sensor, the driver, etc. may be mounted on a circuit board 1200 provided in the camera module 1000 or a circuit board provided in the actuator 100. In order to interface with an external module, a power supply unit, an external device, etc., the circuit board 1200 is preferably configured so that a portion thereof is exposed to the outside.

[0117] The first guide 121 and the first rail 13 together with the first ball B1 perform a function of physically supporting and guiding the movement of the carrier 120 that rotates relative to the intermediate guide 130 as a fixed body.

[0118] Therefore, when the pulling magnet PM is located in the rear middle part of the carrier 120 and the first guide 121 is set outside the pulling magnet PM, not only the tilt or gap of the carrier 120 can be minimized, but also the first direction rotation of the carrier 120 can be achieved more stably.

[0119] Figure 7 and Figure 8 It is a diagram for explaining the operational relationship of the traction magnet PM.

[0120] As described above, if power of appropriate magnitude and direction is applied to the first coil C1 , the carrier 120 rotates along the first direction due to the magnetic force between the first coil C1 and the first magnet M1 , and the jitter of the X-axis component is corrected by this rotation.

[0121] When the carrier 120 rotates in this way, the pulling magnet PM provided on the carrier 120 also moves together with the carrier 120 , so that the mutual position (posture) relationship between the pulling magnet PM and the second magnet M2 changes from matching to mismatching.

[0122] In this state, if an event such as the drive of the first direction OIS ends or stops occurs, due to the attraction and repulsion between the facing magnetic pole (the second magnet M2) and the anti-magnetic pole (traction magnet PM), the traction magnet PM has a restoring force that naturally returns to the reference position (default position) of the position or posture where the traction magnet PM and the second magnet M2 are aligned.

[0123] Figure 7 Assume that the carrier 120 is driven in a state where it rotates clockwise in the first direction OIS, and the restoring force RF for rotating the carrier 120 provided with the pulling magnet PM in the counterclockwise direction is shown as an example.

[0124] Since the restoring force for the carrier 120 to return to the reference position is a rotational force, it is preferred that the traction magnet PM is configured to have a shape extending along the length direction of the second magnet M2, for example, along a direction corresponding to the extension direction of the magnetic pole boundary of the second magnet M2, so that the carrier 120 can return to the reference position with minimized torque.

[0125] In addition, the torque is proportional to the distance from the rotation center and the force, and the magnetic force is proportional to the magnetic flux density. Therefore, in order to provide sufficient adhesion between the carrier 120 and the intermediate guide 130 while improving the efficiency of the rotation restoring force, as shown in FIG. Figure 8 As shown, the pulling magnet PM is preferably configured such that the outer width based on the surface facing the second magnet M2 is larger than the inner width.

[0126] If the outer width of the traction magnet PM can be larger than the inner width, it is possible to adopt Figure 8 The illustrated embodiment has an overall oblique line shape, but may also have a stepped shape.

[0127] like Fig. 9 As illustrated, even if the magnetic pole (anti-magnetic pole) of the traction magnet PM facing the second magnet M2 based on the alignment position is constructed as a single pole (one of the N pole or the S pole), when the traction magnet PM rotates, the above-mentioned rotational restoring force of the carrier 120 can be achieved by the attraction and repulsion between the anti-magnetic pole and the second magnet M2.

[0128] In this regard, if it is possible to generate a torque generated by a magnetic force while the carrier 120 is rotating while generating an attractive force between the carrier 120 and the second magnet M2, a magnetic field including Fig.10 Various embodiments including the structure of the traction magnet PM are illustrated.

[0129] On the other hand, as referenced Figure 3 As described in the examples above, the back yoke 170 made of a magnetic material for concentrating magnetic force is provided on the intermediate guide 130 by insert molding or the like, and the second magnet M2 is provided in the opposite direction to the second coil C2.

[0130] Therefore, the back yoke 170 is located between the pulling magnet PM and the second magnet M2 and is made of a magnetic material, so that it is possible to reduce the attractive force and the restoring force (reference position restoring force) between the pulling magnet PM and the second magnet M2.

[0131] To effectively address this, Figure 3 As shown, the back yoke 170 is preferably configured to form an opening portion 170S in a region or portion corresponding to a region where the second magnet M2 faces the pulling magnet PM.

[0132] Fig.11 is a diagram showing a reflector actuator 100 according to another embodiment of the present invention.

[0133] The embodiment of the present invention described above corresponds to an embodiment in which the driving magnet for driving the second direction OIS is utilized as a magnet that generates a suction force and a restoring force in relation to the pulling magnet PM.

[0134] In contrast, Fig.11 The illustrated embodiment is equivalent to using a separate magnet instead of a driving magnet for driving the second direction OIS as the second magnet M2 that generates an attractive force and a restoring force in relation to the pulling magnet PM.

[0135] exist Fig.11In the case of the embodiment shown, the intermediate guide 130 supporting the first direction rotation of the carrier 120 may have an overall curved shape. The driving magnet M3 driving the second direction rotation of the intermediate guide 130 is arranged on the upper side (Z-axis reference) of the intermediate guide 130, and the second coil C2 provided on the housing 140 is arranged in a direction facing the above-mentioned driving magnet M3.

[0136] As described above, when power of appropriate magnitude and direction is applied to the second coil C2, magnetic force (electromagnetic force) is generated between the second coil C2 and the driving magnet M3. The driving force generated by the magnetic force causes the intermediate guide 130 to rotate in the second direction.

[0137] In order to guide such second-direction rotational movement, it goes without saying that the second rail 132 provided at the intermediate guide 130 and a second guide (not shown) facing the second rail 132 and provided at the housing 140 side may have a circular shape.

[0138] According to the implementation form, Fig.11 As illustrated, the second rail 132 guiding the movement of the second ball B2 and a second guide (not shown) facing the second rail 132 may be implemented as a linear rail extending in a straight direction with the Y axis as a reference.

[0139] In this case, when magnetic force (electromagnetic force) is generated between the second coil C2 and the driving magnet M3 , the intermediate guide 130 uses the magnetic force as driving force to linearly move in the Y-axis direction along the second rail 132 as a linear rail together with the carrier 120 .

[0140] Thus, when the intermediate guide 130 moves linearly in the Y-axis direction, the light of the subject reflected by the reflector 110 provided in the carrier 120 and entering the image sensor 30 is shifted with respect to the Y-axis direction, thereby achieving OIS in the Y-axis direction.

[0141] As described above, in the present embodiment, the facing magnetic poles of the second magnet M2 provided on the intermediate guide 130 and the reverse magnetic poles of the pulling magnet PM provided on the carrier 120 may face each other at corresponding positions.

[0142] Therefore, not only can the close contact between the carrier 120 and the intermediate guide 130 be maintained, but also when an event such as the driving of the first direction OIS is terminated or stopped occurs, the carrier 120 returns to a position or posture matching the intermediate guide 130 .

[0143] Although the present invention has been described above through limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that a person skilled in the art in the technical field to which the present invention belongs can make various modifications and variations within the scope of the technical idea of ​​the present invention and the claims described below.

[0144] In the above description of the present invention, modifiers such as first, second, etc. are merely tool concepts used to relatively distinguish components from each other, and therefore, lithotripsy is not a term used to indicate a specific order, priority, etc.

[0145] The drawings attached to the description of the present invention and the illustrations of its embodiments may be illustrated in a slightly exaggerated form in order to emphasize or highlight the technical content of the present invention, but it should be interpreted as a matter of course that various forms of modified application examples can be made at the level of ordinary technicians in the technical field to which the present invention belongs, taking into account the above-mentioned contents and matters shown in the drawings.

Claims

1. A reflector actuator, characterized in that: include: A carrier, on which a reflector is mounted and a first magnet is provided; An intermediate guide, supporting the carrier to rotate in a first direction; a first ball, disposed between the carrier and the intermediate guide; A second magnet is disposed on the intermediate guide member; A pulling magnet is disposed on the carrier and is disposed in a direction facing the second magnet; as well as a first coil, providing a driving force to the first magnet, The pulling magnet includes an opposite magnetic pole that is opposite to a facing magnetic pole of the magnetic poles of the second magnet that is in a direction toward the pulling magnet.

2. The reflector actuator according to claim 1, characterized in that The counter magnetic pole is disposed at a position corresponding to the facing magnetic pole.

3. The reflector actuator according to claim 1, characterized in that: The pulling magnet has a shape extending in a direction corresponding to the length direction of the second magnet.

4. The reflector actuator according to claim 1, characterized in that The first direction rotation is achieved by the carrier in a plane parallel to a direction facing the intermediate guide.

5. The reflector actuator according to claim 1, characterized in that: Also includes: A housing supporting the intermediate guide member to rotate in a second direction; a second ball, disposed between the intermediate guide and the housing; as well as The second coil provides a driving force to the second magnet.

6. The reflector actuator according to claim 5, characterized in that Also included is a back yoke, which is disposed on the intermediate guide and is disposed in the opposite direction from the second magnet toward the second coil. The back yoke has an opening formed at a portion corresponding to a region where the second magnet and the pulling magnet face each other.

7. The reflector actuator according to claim 1, characterized in that With the surface facing the second magnet as a reference, the outer width of the pulling magnet is greater than the inner width of the pulling magnet.

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