Actuator for reflector

Abstract

An actuator for a reflector according to an embodiment of the present invention comprises: a carrier on which a reflector is mounted and which rotates in a first direction; an intermediate guide that supports the rotation of the carrier and is provided with a second magnet; a first ball disposed between the carrier and the intermediate guide; a first magnet provided on the carrier; and a first coil that supplies a driving force to the first magnet, the mutually adjacent magnetic poles of the first magnet and the second magnet being configured from the same magnetic poles so as to generate a repulsive force between the first magnet and the second magnet when the carrier is rotated in the first direction.

Description

Technical Field

[0001] The present invention relates to an actuator for a reflector, and more particularly, to an actuator for a reflector with improved driving accuracy by improving an arrangement structure of magnetic poles of a magnet. Background Art

[0002] With the development of hardware technology for image processing and the increase in user demand for image capture, 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 that adjusts 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 of improving the clarity of an image by adaptively moving a carrier on which a lens (or image sensor) is mounted in a direction to compensate for the shaking caused by hand shaking of the lens or image sensor.

[0005] One of the representative methods for realizing autofocus or OIS function is to set a magnet (coil) on the mover (carrier) and set a coil (magnet) on the stator (housing, base or other forms of carrier, etc.), and then generate a driving force between the coil and the magnet to move the mover along the optical axis or perpendicular to the optical axis.

[0006] On the other hand, recent mobile terminals are equipped with zoom lenses having more specifications, which can variably adjust the focal length or capture images at a long distance, 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, etc., having a physical structure for refracting light of a subject using a reflector disposed at a front end of a lens, is disclosed to organically integrate the physical characteristics of such a zoom lens with the geometric features of a portable terminal.

[0009] Such an actuator or the like employing a reflector that reflects light from a subject toward the lens realizes OIS by moving the reflector in one or two axes when shake occurs.

[0010] When OIS is realized in two axial directions, the movable element in each direction is configured to rotate independently, and thus a magnet is provided for each movable element in order to drive such independent rotation.

[0011] In the case of a device and an actuator using a reflector, unlike conventional OIS that implements OIS through linear movement, OIS is implemented through the rotation of the reflector, so the relative position and posture relationship between the actuators changes dynamically.

[0012] Therefore, the influence of the magnetic force between the magnets included in each mover also has nonlinear characteristics depending on the relative positional relationship between the movers and the like.

[0013] In the case where the magnetic force between magnets has nonlinear characteristics, not only will the accuracy of OIS driving in all directions be reduced, but also the function (centering) of returning the actuator to the predetermined reference position and the initial position (default position) cannot be realized after OIS ends. Therefore, in this regard, in the case of existing actuators, when the OIS drive is started, the current position of the reflector must be processed first, so the immediate responsiveness will be reduced and the driving accuracy will also be reduced. Summary of the invention

[0014] Technical issues to be solved The present invention is proposed to solve the problems mentioned in the above-mentioned background technology, and its purpose is to provide an actuator for a reflector, which improves the magnetic pole arrangement of the magnets possessed by each mover in a manner of generating repulsive force between relatively close magnetic poles through rotational movement, thereby not only effectively realizing the restoring force of the mover returning to a specific reference position, but also improving the driving accuracy of OIS.

[0015] Other objects and advantages of the present invention can be understood through the following description and will become more apparent through the embodiments of the present invention. In addition, the objects and advantages of the present invention can be achieved through the structures described in the claims and the combination of the structures.

[0016] Means used to solve problems An actuator for a reflector according to an embodiment of the present invention for achieving the above-mentioned purpose may include: a carrier, which carries a reflector and rotates along a first direction; an intermediate guide, which supports the rotation of the carrier and is provided with a second magnet; a first ball, which is arranged between the carrier and the intermediate guide; a first magnet, which is provided on the carrier; and a first coil, which provides driving force to the first magnet.

[0017] In this case, the adjacent magnetic poles of the first magnet and the second magnet of the present invention are composed of the same magnetic poles in such a manner that a repulsive force is generated between the first magnet and the second magnet.

[0018] The actuator according to the present invention may further include: a housing supporting the intermediate guide to rotate in a second direction; a second ball disposed between the intermediate guide and the housing; and a second coil providing a driving force to the second magnet.

[0019] In addition, the first magnet of the present invention may include: a first sub-magnet, which is arranged on one side of the carrier; and a second sub-magnet, which is arranged on the other side of the carrier, and when the carrier rotates in the first direction, the second sub-magnet rotates in the same direction as the first sub-magnet. In this case, when the carrier rotates in the first direction, the magnetic pole of the first sub-magnet adjacent to the second magnet may be configured to be the opposite magnetic pole to the magnetic pole of the second sub-magnet adjacent to the second magnet.

[0020] Preferably, the actuator according to the present invention may further include a magnetic body disposed on the carrier and generating attractive force with the second magnet.

[0021] The magnetic body of the present invention may be a magnet facing the second magnet. In this case, the magnetic pole of the magnetic body facing the second magnet may be opposite to the magnetic pole of the second magnet.

[0022] Preferably, the magnetic body of the present invention may have a shape extending in a direction corresponding to the length direction of the second magnet. In addition, the magnetic body of the present invention may be configured such that the outer width is greater than the inner width.

[0023] Technical Effects According to a preferred embodiment of the present invention, repulsive force is generated between magnets that are relatively close to each other due to rotational movement, so that the nonlinear behavior characteristics of the magnetic field between the magnets can be improved, thereby improving the driving precision of the OIS.

[0024] In addition, according to one embodiment of the present invention, the mover is provided with a plurality of magnets in a symmetrical manner with the rotation center as a reference, and in relationship with the magnets provided on the relative stator, these magnets all generate repulsive forces in the same direction, thereby improving stability and precision relative to rotational movement.

[0025] In a preferred embodiment of the present invention, an attractive force is generated between the mover and the stator through the corresponding magnetic pole relationship, thereby achieving not only a close contact force between the mover and the stator but also a reference position restoring force of the mover.

[0026] Furthermore, according to a preferred embodiment of the present invention, due to the physical shape of the magnetic body having an outer width relatively larger than an inner width, a torque for accurate resetting can be more effectively generated without reducing the suction force. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 and Figure 2 is a diagram showing the overall structure of an actuator for a reflector and a camera module according to a preferred embodiment of the present invention; Figure 3 and Figure 4 is an exploded view showing a detailed structure of an actuator for a reflector according to a preferred embodiment of the present invention; Figure 5 is a diagram showing the action relationship of the reflector rotating and moving along the first direction; Figure 6 is a diagram showing the action relationship of the reflector rotating and moving along the second direction; Figure 7 is a diagram illustrating the arrangement relationship of individual magnets; Figure 8 is a diagram illustrating the positional relationship of a magnet accompanying the rotation of a carrier; Fig. 9 is a diagram illustrating the operational relationship of a pulling magnet according to an embodiment of the present invention; Fig.10 It is a diagram for explaining the operational relationship of the pulling magnet according to another embodiment of the present invention.

[0029] Description of Reference Numerals 1000: Camera module 1100: Housing 1200: Circuit board 100: Actuator 110: reflector 120: carrier 121 (131): First guide rail 130: Intermediate guide member 132 (142): Second guide rail 140: Housing 150: yoke plate 170: back yoke 170S: Open Department M1: first magnet M1-1: first sub-magnet M1-2: Second sub-magnet M2: Second magnet PM: traction magnet C1: first coil C2: Second coil B1: First ball B2: Second ball FA: adjacent magnetic pole of the first sub-magnet FB: The adjacent magnetic pole of the second sub-magnet M2A (M2B): adjacent pole of the second magnet DETAILED DESCRIPTION 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 should not be interpreted as the commonly used or dictionary-defined meanings, but 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.

[0030] 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 all the technical ideas of the present invention. Therefore, it should be understood that there may be a variety of equivalents and modifications that can replace them for this application.

[0031] Figure 1 and Figure 2 1 is a diagram showing an overall structure of an actuator for a reflector (hereinafter referred to as “actuator”) 100 and a camera module 1000 including the same according to a preferred embodiment of the present invention.

[0032] 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 and FIG. 2 , the camera module 1000 may be implemented in the form of 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 the image sensor 30 .

[0033] 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.

[0034] like Figure 1 As illustrated, the path of light entering from the outside is Z1, and the path of light entering from the outside is refracted or reflected by the reflector 110 and enters the lenses 50, 60, 70 is Z.

[0035] In the following description, the Z-axis direction corresponding to the direction in which light enters the lenses 50 , 60 , 70 is referred to as the optical axis or the optical axis direction, and the two directions perpendicular to the optical axis direction are referred to as the X-axis and the Y-axis.

[0036] As one of the examples in the drawings, the Y axis is illustrated as a direction axis from the reflector 110 toward the subject, but from another relative angle, the X axis can also be defined as a direction axis toward the subject, which is self-evident.

[0037] 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 frequency band may be provided together. It is needless to say that the number and position of the lenses 50, 60, and 70 may be different from those shown in the drawings depending on the embodiment.

[0038] As described in detail later, the actuator 100 of the present invention is equivalent to a device that rotates the reflector 110 in a direction to compensate for the movement of the reflector 110 when a shake due to hand shaking or the like occurs with respect to the X-axis direction and / or the Y-axis direction perpendicular to the optical axis, thereby achieving OIS relative to the X-axis direction and / or the Y-axis direction.

[0039] 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 .

[0040] In this case, it goes without saying that the housing 140 as a structure constituting the actuator 100 may be the housing of the actuator 100 itself or the housing 1100 of the camera module 1000 .

[0041] The axes shown in the drawings, the terms referring to the axes, and the terms such as upper, lower, front, rear, vertical, horizontal, etc. described with reference to the axes are obviously only used to indicate relative references for describing the embodiments of the present invention, and are not used to specify a direction or position from an absolute reference. It goes without saying that they may change relatively depending on the position of the object as the object, the position or direction of view, etc.

[0042] In the following description, the embodiments of the present invention are described with the Z axis as the up-down direction or the vertical direction as a reference, and from the corresponding angles, the embodiments of the present invention are described with the Y axis as the front or rear reference and the X axis as the left or right reference.

[0043] In the case of the actuator 100 according to an embodiment of the present invention as a reference, as described later, the XZ plane or a plane corresponding to the XZ plane becomes the plane direction in which the carrier 120 rotates with the intermediate guide 130 relative to the stator (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 ).

[0044] The content of the present invention described below is equivalent to an embodiment of the technical idea of ​​the present invention. Therefore, within the scope of the technical idea of ​​the present invention, the intermediate guide 130 of the present invention can be configured to rotate relative to the XZ plane or the XY plane with the housing 140 as a relative stator, and from a corresponding angle, the carrier 120 of the present invention can also be configured to rotate on the XY plane or the YZ plane.

[0045] 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.

[0046] 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.

[0047] First, the overall structure of the actuator 100 will be described with reference to the drawings, and the detailed structure and driving relationship of the actuator 100 for OIS driving in each direction will be described later.

[0048] As described above, if the subject's light enters the actuator 100 along the Z1 path, the reflector 110 changes (refracts or reflects) the light path to the optical axis direction Z, and allows the light to enter the lenses 50 , 60 , 70 .

[0049] 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 components capable of changing the direction of light entering from the outside into the direction of an optical axis.

[0050] In this way, the present invention is constructed in a manner that the light is refracted through the reflector 110 and then enters the lenses 50, 60, and 70, thereby eliminating the need to set the actuator 100 along the thickness direction of the mobile terminal (smartphone, etc.). Therefore, even if an optical component such as a zoom lens having physical properties that are long along the optical axis is installed in the mobile terminal, the thickness of the mobile terminal will not be increased, and an effect that is conducive to the miniaturization of the mobile terminal can be provided.

[0051] As is well known, OIS driving is achieved by moving the lens, etc. along the direction of correcting the shake caused by hand shake. In the embodiment applicable to the present invention, unlike the method of moving the lens, etc. in the opposite direction, OIS is driven by moving the reflector 110.

[0052] The reflector 110 of the present invention is disposed in the actuator 100 along the direction in which light enters, that is, in the direction forward in the Y-axis direction, and is fixed to the carrier 120 , so that it physically moves together with the carrier 120 .

[0053] If 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 the relative stator), 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 the relative stator), the reflector 110 arranged on the carrier 120 also rotates in the same direction.

[0054] Preferably, the first rolling balls B1 may be arranged between the carrier 120 and the intermediate guide 130 , and the second rolling balls B2 may be arranged between the intermediate guide 130 and the housing 140 .

[0055] When such balls B1 and B2 are in between, the following advantages can be achieved: by minimizing the friction caused by the rolling, moving, rotation, and point contact with the facing object of the balls, the mover can move linearly more flexibly, which can not only reduce noise and minimize the driving force, but also improve the driving accuracy.

[0056] As described later, when the carrier 120 provided with the reflector 110 is rotated relative to the stator with the intermediate guide 130 as a reference on the XZ plane (see Figure 5 ), through the rotational movement of the reflector 110, the path of the light entering the image sensor 30 side moves along the X-axis direction while correcting the hand shake of the X-axis direction component.

[0057] 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 ), through the rotational movement of the reflector 110, the path of the light entering the image sensor 30 is moved along the Y-axis direction while correcting the hand shake of the Y-axis direction component.

[0058] In the following description, with respect to X-axis direction hand shake correction, the direction in which the reflector 110 rotates and moves on a plane corresponding to the XZ plane is referred to as the "first direction", and with respect to Y-axis direction hand shake correction, the direction in which the reflector 110 rotates and moves on a plane corresponding to the YZ plane is referred to as the "second direction".

[0059] In this regard, the intermediate guide 130 of the present invention corresponds to a stator in relation to the carrier 120 for rotational movement in the first direction, and corresponds to a mover in relation to the housing 140 for rotational movement in the second direction.

[0060] like Figure 3 and Figure 4 As shown, a second magnet M2 for driving the OIS in the second direction may be provided on the intermediate guide 130 .

[0061] According to an embodiment, the second magnet M2 may be disposed in the intermediate guide 130 with the back yoke 170 interposed therebetween to enhance the magnetic force between the second coil C2 and the second magnet M2 . The back yoke 170 is used to prevent magnetic force leakage and concentrate magnetic force.

[0062] The magnetic body PM of the present invention is a structure disposed on the carrier 120, and is disposed in a manner facing the second magnet M2 as shown in the figure. Figure 4 When the Y axis is used as a reference, the magnetic body PM is provided on the rear surface of the carrier 120 (based on the Y axis), and when the intermediate guide 130 is used as a reference, it is arranged in front of the intermediate guide 130 (based on the Y axis).

[0063] The magnetic body PM generates an attractive force on the second magnet M2, so that the carrier 120 including the magnetic body PM is closely attached to the intermediate guide 130. In this regard, it is needless to say that the magnetic body PM can be made of a material having magnetism.

[0064] The magnetic body PM is preferably composed of a magnet so that the magnetic force acts as a rotational torque in relation to the second magnet M2, and when the driving of the OIS in the first direction ends, the carrier 120 can return to the original reference position. Hereinafter, the magnetic body composed of a magnet is referred to as a "traction magnet PM".

[0065] Preferably, the pole of the traction magnet PM facing the above-mentioned second magnet M2 (hereinafter referred to as the "facing pole") is constructed to have a polarity opposite to the pole of the second magnet M2 facing the traction magnet PM (hereinafter referred to as the "countermagnetic-pole"). 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 .

[0066] The second magnet M2 is disposed on the intermediate guide 130, and the traction magnet PM is disposed on the carrier 120. Therefore, when attraction is generated between the traction magnet PM and the second magnet M2, the carrier 120 is pulled toward the intermediate guide 130, so that the carrier 120 with the first ball B1 sandwiched therebetween is in close contact with the intermediate guide 130.

[0067] Through such an attractive force relationship, point-contacts between the first rolling ball B1 and the carrier 120 and between the first rolling ball B1 and the intermediate guide 130 can be continuously maintained.

[0068] In addition, even if the carrier 120 rotates with the XZ plane as the reference through the OIS drive in the first direction, if the OIS drive ends or stops, the traction magnet PM will restore the position or posture of the carrier 120 to the position or posture where the second magnet M2 matches or faces the traction magnet PM in an orderly manner.

[0069] For reference, in the case where the actuator 100 of the present invention is implemented as an embodiment that drives OIS in the first direction only, the second magnet M2 described above may be provided on a stator such as the housing 140 instead of being provided on a mover.

[0070] 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.

[0071] As shown in the figure, a first magnet M1 for driving the OIS in a first direction is disposed on a carrier 120 on which the reflector 110 is disposed.

[0072] As shown in the figure, in order to improve driving efficiency, etc., the first magnets M1 may be respectively disposed on the left and right sides (M1-1, M1-2) of the carrier 120. One of the first magnets M1 is called a first sub-magnet M1-1, and the other is called a second sub-magnet M1-2.

[0073] 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 may be provided (C1-1, C1-2).

[0074] When a power of appropriate magnitude 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 while facing the intermediate guide 130 in a plane-to-plane manner (see Figure 5 ), OIS in the X-axis direction, that is, OIS in the first direction is achieved by such rotational movement. In this case, the rotation axis RA for OIS in the first direction corresponds to the Y-axis.

[0075] The first rolling balls B1 may be disposed between the carrier 120 and the intermediate guide 130 . Specifically, the first rolling balls B1 may be disposed between the first guide rails 121 provided on the carrier 120 and the first guide rails 131 provided on the intermediate guide 130 .

[0076] The first guide rails 121 and 131 may have a circular shape (eg, a track shape, etc.) to effectively guide the rotational movement, and a portion of the first ball B1 may be accommodated in one or more of the first guide rails 121 and 131 to effectively guide the rotational movement.

[0077] The accompanying drawings show an embodiment in which both the carrier 120 and the intermediate guide 130 are provided with the first guide rails 121, 131, but depending on the embodiment, only one of them may be provided with the first guide rail. In this case, a groove or a molded portion for accommodating the first ball B1 and preventing the first ball B1 from falling out may be provided in the structure without the first guide rail.

[0078] According to an embodiment, a sensing sensor may be further included. In this case, if the sensing sensor senses 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 power of a corresponding magnitude and direction.

[0079] The sensing sensor may be implemented by a Hall sensor, which utilizes 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.

[0080] From a corresponding perspective, if an appropriate amount and direction of power is applied to the second coil C2 by the control of a driver (not shown), a magnetic force (electromagnetic force) is generated between the second coil C2 and the second magnet M2. The intermediate guide 130 uses the generated magnetic force as a driving force to rotate and move along the second direction (YZ plane) with the carrier 120 based on the housing 140 (as a relative stator) (see Figure 6 ).

[0081] Second guide rails 132 and 142 are provided on a rear surface 130B (with the Y axis as a reference) of the intermediate guide 130 and a front surface (with the Y axis as a reference) of the housing 140 , and the second balls B2 are arranged between the second guide rails 132 and 142 .

[0082] When a magnetic force is generated between the second coil C2 and the second magnet M2 , the intermediate guide 130 rotates (rotates in the second direction) along the circular shape of the second guide rails 132 , 142 between which the second balls B2 are sandwiched.

[0083] The yoke plate 150 is disposed on the housing 140 and generates an attractive force with the second magnet M2 disposed on the intermediate guide 130 . The housing 140 functions as a relative stator relative to the movement of the intermediate guide 130 in the second direction.

[0084] By the attractive force between the yoke plate 150 and the second magnet M2 , point contact between the intermediate guide 130 and the second balls B2 and between the second balls B2 and the housing 140 can be continuously maintained.

[0085] In the case of driving the rotational movement in the first direction, the intermediate guide 130 of the present invention plays the role of a stator in the relative relationship with the carrier 120, and supports the rotational movement in the first direction of the carrier 120. In addition, in the case of driving the rotational movement in the second direction, the housing 140 of the present invention plays the role of a stator in the relative relationship with the intermediate guide 130, and supports the rotational movement of the intermediate guide 130 in the second direction.

[0086] As shown in the figure, the first guide rail 131 formed on the intermediate guide 130 can be formed in a circular shape like a track based on the XZ plane to guide the rotational movement in the first direction of the carrier 120. In the case of the second guide rail 132, it can be formed in a circular shape based on the YZ plane to guide the rotational movement of the carrier 120 and the intermediate guide 130 in the second direction.

[0087] The first guide rail 131 and the second guide rail 132 are formed in directions perpendicular to each other and are arranged in a form of accommodating the second ball B2 between the second guide rails 132 and 142. Therefore, when the carrier 12 rotates the intermediate guide 130 relative to the stator in the first direction through the guidance of the first guide rails 121, 131, etc., the second guide rails 132, 142 and the second ball B2, etc. act as a physical structure that suppresses the rotational movement of the intermediate guide 130.

[0088] 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 relationship with the housing 140 .

[0089] From a corresponding angle, when the magnetic force between the second magnet M2 and the second coil C2 generates a driving force on the second magnet M2, the intermediate guide 130 is rotated and moved along the second direction (YZ plane) through the guidance of the second guide rails 132, 142 and the second balls B2 therebetween.

[0090] In this case, the carrier 120 is held in a fixed position relative to the intermediate guide 130 by the restraining structure based on the first rails 121 and 131 and the first balls B1 , so the carrier 120 rotates in the second direction together with the intermediate guide 130 .

[0091] The first coil C1, the second coil C2, the Hall sensor, the driver, etc. may be mounted on a circuit substrate 1200 provided in the camera module 1000 or a circuit substrate provided in the actuator 100. Preferably, the circuit substrate 1200 may be configured to be partially exposed to the outside so as to be interfacing with an external module, a power unit, an external device, etc.

[0092] The first guide rails 121 and 131 together with the first balls B1 play a role of physically supporting and guiding the rotation of the intermediate guide 130 as the carrier 120 that rotates relative to the stator.

[0093] Therefore, when the traction magnet PM is located in the middle part of the rear surface of the carrier 120 and the first guide rail 121 is arranged on the outside of the traction magnet PM, not only the inclination or gap of the carrier 120 can be minimized, but also the rotation of the carrier 120 in the first direction can be made more stable.

[0094] As described above, according to embodiments, the plane in which the rotation of the carrier 120 and / or the intermediate guide 130 is achieved may be different from the form illustrated in the drawings.

[0095] From a corresponding perspective, it goes without saying that, depending on the embodiment, the plane of the first guide rail 121, 131 or the second guide rail 132, 142 that guides the rotation of the carrier 120 or the intermediate guide 130 or the directionality of the circular shape forming these guide rails may be different from the form illustrated in the figure.

[0096] Figure 7 1 is a diagram illustrating the arrangement relationship of the individual magnets M1 and M2. Figure 8 It is a diagram for explaining the positional relationship between the magnets M1 and M2 accompanying the rotation of the carrier 120.

[0097] The carrier 120 of the present invention is equipped with the reflector 110 and rotates in the first direction (XZ plane) relative to the stator about the rotation axis RA corresponding to the Y axis. As described above, the rotation of the carrier 120 is achieved by the driving force between the first coil C1 and the first magnet M1.

[0098] When the carrier 120 rotates, the first magnet M1 mounted on the carrier 120 also rotates. This also applies to the case where the first magnet M1 is composed of the first sub-magnet M1-1 and the second sub-magnet M1-2 as illustrated in the figure.

[0099] From a relative perspective, the intermediate guide 130 of the present invention plays the role of a relative stator that physically supports the movement of the above-mentioned carrier 120 when it rotates in the first direction, and rotates in the second direction together with the carrier 120 when realizing OIS on the Y-axis based on the rotation in the second direction.

[0100] The first magnet M1 for driving the rotation in the first direction is provided at the carrier 120, and the second magnet M2 for driving the rotation in the second direction is provided at the intermediate guide 130. That is, the first magnet M1 and the second magnet M2 are provided at separate objects different from each other.

[0101] When the OIS in the first direction is driven, the carrier 120 rotates in the first direction, and the intermediate guide 130 , which functions as a counter stator for the rotation in the first direction, does not move.

[0102] Therefore, in the case of driving the OIS in the first direction, as Figure 7 and Figure 8 As illustrated in the examples, the first sub-magnet M1 - 1 and the second sub-magnet M1 - 2 mounted on the carrier 120 rotate clockwise or counterclockwise with respect to the rotation axis RA, and the second magnet M2 mounted on the intermediate guide 130 maintains its position.

[0103] When the OIS in the second direction is driven, as described above, the intermediate member guide 130 moves together with the carrier 120. Therefore, when both the OIS in the first direction and the OIS in the second direction are driven, the carrier 120 has a combined displacement caused by both the OIS in the first direction and the OIS in the second direction with respect to the stator (e.g., the housing 140, 1100).

[0104] In the case where the carrier 120 is rotated in the counterclockwise direction by the OIS driving in the first direction ( Figure 8 a), one of the magnetic poles of the first sub-magnet M1-1 is relatively close to one of the magnetic poles of the second magnet M2.

[0105] Since the second sub-magnet M1 - 2 rotates in the same direction as the first sub-magnet M1 - 1 , one of the magnetic poles of the second sub-magnet M1 - 2 is also relatively close to one of the magnetic poles of the second magnet M2 .

[0106] exist Figure 8 In a, the magnetic poles denoted by FA among the magnetic poles of the first sub-magnet M1-1 and the magnetic poles denoted by FB among the magnetic poles of the second sub-magnet M1-2 are adjacent magnetic poles.

[0107] It can be configured such that the second magnet M2 is located at the bottom (with Figure 8 When the magnetic pole M2A of the second magnet M1 (as a reference) is composed of the same magnetic pole as the adjacent magnetic pole FA of the first sub-magnet M1-1, and the upper magnetic pole M2B among the magnetic poles of the second magnet M2 is composed of the same magnetic pole as the adjacent magnetic pole FB of the second sub-magnet M1-2, a repulsive force acts between the above-mentioned first magnet M1 and the second magnet M2.

[0108] The case where the carrier 120 is rotated in the clockwise direction by the OIS driving in the first direction ( Figure 8 b) also corresponds to it.

[0109] If the adjacent magnetic poles of the first magnet M1 and the second magnet M2 are composed of the same magnetic poles, when the carrier 120 rotates by the OIS in the first direction, a repulsive force may act between the first magnet M1 and the second magnet M2 regardless of the rotation direction.

[0110] In the case where a repulsive force acts between the first magnet M1 and the second magnet M2 in this manner, the driving force required for the rotational movement in the first direction needs to be increased, so the driving efficiency may be partially reduced.

[0111] However, the repulsive force between the first magnet M1 and the second magnet M2 acts as a component that hinders the rotation, so if the driving force for driving the rotational movement in the first direction is increased in a manner to offset the hindering component, the problem can be easily solved. In addition, according to simulation and experimental results, the increased driving force distribution has a relatively linear characteristic, so it has considerable advantages in the design of logic or algorithms for drive control.

[0112] In contrast, in the case where an attractive force is generated between the first magnet M1 and the second magnet M2 , the driving force for the rotational movement in the first direction may be partially reduced.

[0113] However, when an attractive force acts between the first magnet M1 and the second magnet M2, the attractive force acts in a direction to accelerate the rotation in the first direction, and the attractive force acts nonlinearly according to the position of the carrier 120. Therefore, the accuracy of position sensing and feedback control based on Hall sensors, etc. is reduced, and due to such problems, the logic or algorithm design for drive control becomes very complicated.

[0114] In addition, if a repulsive force is exerted between the first magnet M1 and the second magnet M2, a force is exerted in a direction opposite to the rotation direction based on the OIS drive in the first direction. Therefore, when the OIS in the first direction ends, the force can be used as a restoring force to restore the carrier 120 to the original reference position, thereby further improving the efficiency of the carrier 120 returning to the reference position.

[0115] As shown in the figure, it can be constructed such that a first sub-magnet M1-1 is provided on one side of the carrier 120 and a second sub-magnet M1-2 is provided on the other side of the carrier 120. When the carrier 120 rotates in the first direction, the second sub-magnet M1-2 rotates in the same direction as the first sub-magnet M1-1.

[0116] In the case of such an embodiment of the present invention, when OIS in the first direction is completed, the force for rotating the carrier 120 to the correct position acts symmetrically and dispersedly, so the carrier 120 can return to the reference position more stably.

[0117] Fig. 9 and Fig.10 It is a diagram for explaining the operational relationship of the traction magnet PM.

[0118] As described above, when power of appropriate magnitude and direction is applied to the first coil C1 , the carrier 120 rotates in the first direction due to the magnetic force between the first coil C1 and the first magnet M1 , and the jitter in the X-axis direction component is corrected by this rotation.

[0119] 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 (attitude) relationship between the pulling magnet PM and the second magnet M2 changes from matching to mismatching.

[0120] If an event such as the OIS drive in the first direction ends or stops in this state, the attraction and repulsion between the facing pole of the traction magnet PM and the opposite pole of the second magnet M2 act as a restoring force, which makes the traction magnet PM naturally return to the reference position (default position) which is the position or posture where the traction magnet PM and the second magnet M2 are arranged in an orderly manner.

[0121] Fig. 9 As an example, the restoring force RF of the carrier 120 provided with the pulling magnet PM rotating in the counterclockwise direction is shown, assuming that the driving is completed in a state where the carrier 120 is rotated in the clockwise direction by the OIS in the first direction.

[0122] Since the restoring force that restores the carrier 120 to the reference position is a rotational force, the traction magnet PM is preferably constructed to have a shape extending along the length direction of the second magnet M2, for example, along a direction corresponding to the length direction extending the magnetic pole boundary of the second magnet M2, so that the carrier 120 can return to the reference position with minimized torque.

[0123] 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. Fig.10 As shown, preferably, the pulling magnet PM is configured such that the width of the outer side based on the surface facing the second magnet M2 is greater than the width of the inner side.

[0124] If the outer width of the traction magnet PM can be larger than the inner width, it is possible not only to Figure 8 As exemplified above, the overall shape may be an oblique line shape, but a step-like shape or the like may also be used.

[0125] On the other hand, as mentioned above Figure 3 As described above, for the purpose of concentrating magnetic force, the back yoke 170 made of a magnetic material is provided on the intermediate guide 130 by injection molding or the like, and is provided in the opposite direction from the second magnet M2 toward the second coil C2.

[0126] 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 the attraction and the restoring force (reference position restoring force) between the pulling magnet PM and the second magnet M2 may be reduced.

[0127] To effectively address this, Figure 3 As illustrated, the back yoke 170 is preferably configured to form an opening 170S in a region or a portion corresponding to a region where the second magnet M2 faces the pulling magnet PM.

[0128] 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 equivalence of the technical idea of ​​the present invention and the claims described below.

[0129] In the above description of the present invention, modifiers such as first, second, etc. are merely tool-conceptual terms used to relatively distinguish components from each other, and should be interpreted as not being terms used to indicate a specific order, priority, etc.

[0130] 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 taking into account the above-mentioned contents and matters shown in the drawings, etc., and it goes without saying 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.

Claims

1. An actuator for a reflector, characterized in that: include: A carrier, equipped with a reflector, and rotating along a first direction; an intermediate guide, supporting the rotation of the carrier and provided with a second magnet; a first ball, arranged between the carrier and the intermediate guide; A first magnet is disposed on the carrier; as well as a first coil, providing a driving force to the first magnet, Adjacent magnetic poles of the first magnet and the second magnet are composed of the same magnetic poles in such a manner that a repulsive force is generated between the first magnet and the second magnet.

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

3. The actuator for a reflector according to claim 1, characterized in that: The first magnet comprises: A first sub-magnet is disposed on one side of the carrier; and a second sub-magnet, disposed on the other side of the carrier, and when the carrier rotates in the first direction, the second sub-magnet rotates in the same direction as the first sub-magnet, When the carrier rotates in the first direction, a magnetic pole of the first sub-magnet adjacent to the second magnet is an opposite magnetic pole to a magnetic pole of the second sub-magnet adjacent to the second magnet.

4. The actuator for a reflector according to claim 1, characterized in that: It also includes a magnetic body which is arranged on the carrier and generates attraction with the second magnet.

5. The actuator for a reflector according to claim 4, characterized in that: The magnetic body is a magnet facing the second magnet, The facing magnetic pole of the magnetic body facing the second magnet is configured to be opposite to the magnetic pole of the second magnet.

6. The actuator for a reflector according to claim 5, characterized in that: The magnetic body has a shape extending in a direction corresponding to a length direction of the second magnet.

7. The actuator for a reflector according to claim 5, characterized in that: The outer width of the magnetic body is greater than the inner width.

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