Lens driving device, camera module including same, and optical device

Abstract

The embodiment includes a base, a housing disposed on the base, a bobbin disposed in the housing, a first magnet disposed on the bobbin, a coil disposed on the housing opposite the first magnet, a second magnet disposed on the bobbin at a distance from the first magnet, a yoke disposed on the housing opposite the second magnet, a ball member disposed between the bobbin and the housing, and a position sensor disposed on the base opposite the first magnet or the second magnet in the optical axis direction.

Description

[Technical Field]

[0001] The embodiments relate to a lens driving device, and a camera module and optical device including the same. [Background technology]

[0002] Ultra-compact and low-power camera modules have been difficult to apply the voice coil motor (VCM) technology used in existing general camera modules, and research into this has been actively conducted.

[0003] Demand and production of electronic products such as smartphones and camera-equipped mobile phones are increasing. Mobile phone cameras are becoming smaller and more pixelated, and as a result, actuators are becoming smaller, larger in diameter, and more multi-functional. To realize high-pixel mobile phone cameras, improved performance and additional functions such as autofocusing, shutter shake reduction, and zoom functions are required. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiments provide a lens driving device that can stably support an AF moving part by easily and freely designing the friction force between the bobbin / housing and the ball member, and a camera module and optical device including the same.

[0005] Furthermore, the embodiment can reduce the influence of the magnetic field of the coil on the position sensor, thereby ensuring the reliability of the AF drive.

[0006] Furthermore, the embodiments provide a lens driving device, a camera module, and an optical device that can have a constant friction force over the entire stroke range of the mover for autofocusing, despite the weight of the mover. [Means for solving the problem]

[0007] A lens driving device according to an embodiment includes a base, a housing arranged on the base, a bobbin arranged in the housing, a first magnet arranged on the bobbin, a coil arranged in the housing opposite the first magnet, a second magnet arranged on the bobbin at a distance from the first magnet, a yoke arranged in the housing opposite the second magnet, a ball member arranged between the bobbin and the housing, and a position sensor arranged on the base opposite the first magnet or the second magnet in the optical axis direction.

[0008] The second magnet may be disposed between the yoke and the first magnet, and the first magnet may be disposed between the second magnet and the coil.

[0009] The housing may include a circuit board disposed thereon, and the coil may be electrically connected to the circuit board.

[0010] The lens driving device may include a current-carrying member electrically connected to the position sensor.

[0011] The position sensor may not overlap the first magnet or the second magnet in a direction perpendicular to the optical axis direction.

[0012] The position sensor may not overlap the yoke in a direction perpendicular to the optical axis direction.

[0013] The first magnet may be disposed on a first side of the bobbin, the second magnet may be disposed on a second side of the bobbin opposite the first side of the bobbin, the coil may be disposed on a first side of the housing, and the yoke may be disposed on a second side of the housing opposite the first side of the housing.

[0014] The ball member is disposed between the side of the bobbin where the second magnet is disposed and the side of the housing where the yoke is disposed, and an attractive force can act between the yoke and the second magnet.

[0015] The ball member is disposed between the side of the bobbin where the first magnet is disposed and the side of the housing where the coil is disposed, and a repulsive force can act between the yoke and the second magnet.

[0016] The yoke may be made of a magnetic material, and the length of the yoke in the optical axis direction may be different from the length of the second magnet in the optical axis direction.

[0017] A drive signal is supplied to the coil, and the bobbin can be moved in the optical axis direction by interaction between the first magnet and the coil.

[0018] The current-carrying member may be disposed on the base and may include at least one terminal electrically connecting the position sensor and the circuit board.

[0019] Alternatively, the current-carrying member may include a circuit member disposed on the base, and the circuit member may include at least one terminal electrically connected to the position sensor.

[0020] The length of the yoke in the optical axis direction may be greater than the length of the second magnet in the optical axis direction, and when the bobbin is located at its lowest point in the optical axis direction, the distance between the upper end of the second magnet and the upper end of the yoke in the optical axis direction may be greater than or equal to 1 and less than or equal to 3 times the total stroke distance of the bobbin in the optical axis direction. Here, at the lowest point, the distance between the lower end of the second magnet and the lower end of the yoke in the optical axis direction may be 0 or greater, and may be 2 times or less the total stroke distance of the bobbin in the optical axis direction.

[0021] Alternatively, the length of the second magnet in the optical axis direction may be greater than the length of the yoke in the optical axis direction, and when the bobbin is positioned at its lowest point in the optical axis direction, the distance between the lower end of the second magnet and the lower end of the yoke in the optical axis direction may be greater than or equal to one time and less than or equal to three times the total stroke distance of the bobbin in the optical axis direction. Here, at the lowest point, the distance between the upper end of the second magnet and the upper end of the yoke in the optical axis direction may be zero or greater, and may be two times or less the total stroke distance of the bobbin in the optical axis direction.

[0022] A camera device according to an embodiment includes a housing, a bobbin disposed within the housing, a first magnet disposed on the bobbin, a coil disposed on the housing opposite the first magnet, a second magnet disposed on the bobbin at a distance from the first magnet, a yoke disposed on the housing opposite the second magnet, a ball member disposed between the bobbin and the housing, a first circuit board disposed below the housing, and a position sensor including an image sensor disposed on the first circuit board and opposite the first magnet or the second magnet in the optical axis direction.

[0023] In the camera device, the second magnet may be disposed between the yoke and the first magnet, and the first magnet may be disposed between the second magnet and the coil.

[0024] The camera device may include a second circuit board disposed in the housing and electrically connected to the first circuit board, and the coil may be electrically connected to the second circuit board. [Effects of the Invention]

[0025] In the embodiment, by providing a second magnet separate from the first magnet, the frictional force between the bobbin / housing and the ball member can be easily and freely designed due to the attractive force caused by the interaction between the yoke and the second magnet, thereby enabling stable support of the AF moving part.

[0026] Furthermore, in this embodiment, the position sensor is disposed far away from the coil, thereby reducing the influence of the magnetic field of the coil on the position sensor, and ensuring the reliability of the AF drive.

[0027] Furthermore, the embodiment can maintain a constant frictional force generated when the mover moves over the entire stroke range of the mover for autofocusing, regardless of the weight of the mover. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 2 is an exploded view of the lens driving device according to the embodiment. [Figure 2] 2 is an exploded perspective view of the bobbin, the first magnet, and the second magnet of FIG. 1. FIG. [Figure 3] FIG. 2 is an exploded perspective view of the housing and yoke of FIG. 1. [Figure 4a] 2 is a plan view of the lens driving device of FIG. 1 with a cover member removed; FIG. [Figure 4b] FIG. 4b shows a variation of FIG. 4a. [Figure 5a] FIG. 2 is a plan view of an embodiment of a first magnet, a coil, a second magnet, and a yoke. [Figure 5b] FIG. 10 is a plan view of another embodiment of the first magnet, the coil, the second magnet, and the yoke. [Figure 6a] 4 is a cross-sectional view of a first magnet, a coil, a second magnet, and a yoke in the optical axis direction according to an embodiment. FIG. [Figure 6b] 6b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 6a is at its lowest point. FIG. [Figure 6c]6b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 6a is at its highest point. FIG. [Figure 7a] 10 is a cross-sectional view of the first magnet, the coil, the second magnet, and the yoke in the optical axis direction according to another embodiment. FIG. [Figure 7b] 7b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 7a is at its lowest point. FIG. [Figure 7c] 7b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 7a is at its highest point. FIG. [Figure 8a] FIG. 10 is a plan view of a lens driving device according to another embodiment. [Figure 8b] 8b is a perspective view of the housing, ball member, and yoke of FIG. 8a. [Figure 9a] FIG. 10 is a plan view of a lens driving device according to still another embodiment. [Figure 9b] FIG. 9b shows a variation of FIG. 9a. [Figure 10] 9b is a plan view of the first magnet, the coil, the second magnet, and the yoke of the lens driving device of FIG. 9a. FIG. [Figure 11a] FIG. 10 illustrates an arrangement of position sensors according to an embodiment. [Figure 11b] FIG. 10 is a diagram showing the arrangement of position sensors according to another embodiment. [Figure 12a] 10A and 10B are diagrams illustrating an example of electrical connection between a position sensor and a current-carrying member. [Figure 12b] 10A and 10B are diagrams illustrating another embodiment of electrical connection between the position sensor and the current-carrying member. [Figure 13] FIG. 10 is a schematic cross-sectional view of a ball-type lens driving device according to a comparative example. [Figure 14] FIG. 2 is an exploded perspective view of a camera module according to an embodiment. [Figure 15] FIG. 10 is an exploded perspective view of a camera module according to another embodiment. [Figure 16] FIG. 10 is an exploded perspective view of a camera module according to yet another embodiment. [Figure 17]FIG. 2 is an exploded view of the lens driving device according to the embodiment. [Figure 18] 18 is an exploded perspective view of the bobbin, the first magnet, and the second magnet of FIG. 17. FIG. [Figure 19] FIG. 18 is an exploded perspective view of the housing and yoke of FIG. 17. [Figure 20a] 18 is a plan view of the lens driving device of FIG. 17 with the cover member removed. [Figure 20b] FIG. 20b shows a variation of FIG. 20a. [Figure 21a] FIG. 2 is a plan view of an embodiment of a first magnet, a coil, a second magnet, and a yoke. [Figure 21b] FIG. 10 is a plan view of another embodiment of the first magnet, the coil, the second magnet, and the yoke. [Figure 22a] 4 is a cross-sectional view of a first magnet, a coil, a second magnet, and a yoke in the optical axis direction according to an embodiment. FIG. [Figure 22b] 22b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 22a is at its lowest point. FIG. [Figure 22c] 22b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 22a is at its highest point. FIG. [Figure 23a] 10 is a cross-sectional view of the first magnet, the coil, the second magnet, and the yoke in the optical axis direction according to another embodiment. FIG. [Figure 23b] 23b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 23a is at its lowest point. FIG. [Figure 23c] 23b is a diagram showing the distance between the top end of the second magnet and the top end of the yoke when the bobbin in FIG. 23a is at its highest point. FIG. [Figure 24a] FIG. 10 is a plan view of a lens driving device according to another embodiment. [Figure 24b] FIG. 24b is a perspective view of the housing, ball member, and yoke of FIG. 24a. [Figure 25a] FIG. 10 is a plan view of a lens driving device according to still another embodiment. [Figure 25b]FIG. 25b shows a variation of FIG. 25a. [Figure 26] 26 is a plan view of the first magnet, the coil, the second magnet, and the yoke of the lens driving device of FIG. 25. FIG. [Figure 27] FIG. 18 is an exploded perspective view of a camera module including the lens driving device of FIG. [Figure 28] FIG. 10 is a cross-sectional view of a lens driving device according to still another embodiment. [Figure 29] FIG. 29 is an enlarged cross-sectional view of region A in FIG. 28. [Figure 30] FIG. 29 is an enlarged cross-sectional view of region B in FIG. 28. [Figure 31] 29 is a diagram showing the arrangement of the coils, hall sensors, and first to third magnets of the lens driving device of FIG. 28. FIG. [Figure 32] 10 is a diagram showing the arrangement of coils, hall sensors, and first to third magnets in a lens driving device according to a modified example. FIG. [Figure 33] FIG. 10 is an exploded perspective view of a camera module according to another embodiment. [Figure 34] 1 is a perspective view of a portable terminal according to an embodiment; [Figure 35] FIG. 35 is a diagram illustrating the configuration of the portable terminal shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the technical concept of the present invention is not limited to the described embodiments, but can be embodied in various different forms, and one or more of the components of the embodiments can be selectively combined or substituted within the scope of the technical concept of the present invention.

[0030] Furthermore, unless otherwise clearly defined and described, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted in a manner that is generally understandable to a person having ordinary knowledge in the technical field to which the present invention belongs, and commonly used terms, such as those defined in a dictionary, may be interpreted in light of the contextual meaning of the relevant art.

[0031] Furthermore, terms used in the examples of the present invention are intended to describe the examples and are not intended to limit the present invention. In this specification, the singular form can also include the plural form unless otherwise specified in the phrase, and when it is written as "A and (and) at least one (or more) of B and C," it can include one or more of all possible combinations of A, B, and C.

[0032] Furthermore, when describing components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. are used. These terms are merely used to distinguish the components from other components, and do not limit the essence, order, or procedure of the components.

[0033] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it can include not only the case where the component is directly coupled, coupled, or connected to the other component, but also the case where the component is "coupled," "coupled," or "connected" by yet another component between the other component. Furthermore, when a component is described as being formed or located "above or below" another component, "above or below" does not only mean that the two components are in direct contact with each other, but also that one or more yet another component is formed or located between the two components. Furthermore, when the term "above or below" is used, it can include not only the meaning above but also the meaning below a component.

[0034] Hereinafter, the lens driving device may be referred to as a lens driving unit, a VCM (Voice Coil Motor), an actuator, or a lens moving device, and the term "coil" may be referred to as a coil unit, and the term "elastic member" may be referred to as an elastic unit or a spring.

[0035] In the following description, the term "terminal" may be substituted with a pad, an electrode, a conductive layer, or a bonding portion.

[0036] For convenience of explanation, the lens driving device according to the embodiment will be explained using a Cartesian coordinate system (x, y, z), but other coordinate systems may also be used and the embodiment is not limited thereto. In each drawing, the x-axis and y-axis refer to directions perpendicular to the z-axis, which is the optical axis direction, and the z-axis direction, which is the optical axis direction, may be referred to as the "first direction," the x-axis direction as the "second direction," and the y-axis direction as the "third direction."

[0037] "Autofocusing" refers to automatically focusing an image of a subject on an image sensor surface. The lens driving device according to the embodiment can perform an autofocusing operation by moving an optical module consisting of at least one lens in a first direction.

[0038] FIG. 1 is an exploded view of a lens driving device 100 according to an embodiment, FIG. 2 is an exploded perspective view of the bobbin 110, first magnet 132, and second magnet 134 of FIG. 1, FIG. 3 is an exploded perspective view of the housing 140 and yoke 136 of FIG. 1, and FIG. 4a is a plan view of the lens driving device 100 of FIG. 1 excluding the cover member 300.

[0039] Referring to Figures 1 to 4a, the lens driving device 100 may include a bobbin 110, a first magnet 132, a second magnet 134, a housing 140, a coil 120, a ball member 310, a yoke 136, and a position sensor 170.

[0040] The lens driving device 100 may further include a base 210 disposed below the housing 140. The lens driving device 100 may further include a circuit board 190 for providing a driving signal to the coil 120. For example, the position sensor 170 may be electrically connected to the circuit board 190, and the circuit board 190 may provide a driving signal to the position sensor 170 and receive an output from the position sensor 170.

[0041] The lens driving device 100 may further include a cover member 300 for accommodating the housing 140 .

[0042] The bobbin 110 is for mounting a lens or a lens barrel, and can be disposed within the housing 140. The bobbin 110 can move in the optical axis OA direction or a first direction (e.g., Z-axis direction) due to electromagnetic interaction between the coil 120 and the first magnet 132. The bobbin 110 can also be referred to as a "lens holder."

[0043] The bobbin 110 may have an opening 21 (see FIG. 5a) for mounting a lens or a lens barrel. For example, the opening 21 of the bobbin 110 may be a through-hole, and its shape may be, but is not limited to, a circle, an ellipse, or a polygon.

[0044] Although not shown in FIG. 2, the bobbin 110 may have at least one first stopper formed on the upper surface. For example, the first stopper may be formed on the bobbin 110. No. 1The bobbin 110 may have a structure that protrudes in the optical axis direction or upward from the upper surface of the bobbin 110, thereby preventing the upper surface of the bobbin 110 from directly hitting the inner surface of the upper plate 301 of the cover member 300. The bobbin 110 may also include at least one second stopper formed on the lower surface.

[0045] The bobbin 110 may include multiple side or outer surfaces.

[0046] For example, the bobbin 110 may include multiple sides 11A to 11D. The bobbin 110 may also include a corner or corner portion located between two adjacent sides.

[0047] The bobbin 110 may include a first seat 105A formed or disposed on a first side (first side or first outer surface) of the plurality of side surfaces (or side surfaces or outer surfaces) for disposing or seating the first magnet 132. The first seat 105A may have a groove shape.

[0048] For example, the first seating portion 105A may be a groove recessed from the first side portion 11A (or first side surface or first outer surface) of the bobbin 110, and may have an opening that opens to at least one of the upper surface or the lower surface of the bobbin 110. Also, for example, the lower portion of the first seating portion 105A may be closed and not open to the lower surface of the bobbin 110.

[0049] The bobbin 110 may include a second seat 105B formed or disposed on a second side 11B (or a second side or a second outer surface) of the plurality of side surfaces (or side surfaces or outer surfaces) to accommodate or seat the second magnet 134. The second seat 105B may have a groove shape recessed from the second side 11B and may have an opening that opens to at least one of the upper surface or the lower surface of the bobbin 110. Also, for example, the lower portion of the second seat 105B may be closed and not open to the lower surface of the bobbin 110.

[0050] For example, the second side 11B (or second side or second outer surface) of the bobbin 110 may be located opposite the first side 11A (or first side or first outer surface) of the bobbin 110.

[0051] In addition, the third side 11C (or third side surface or third outer surface) and the fourth side 11D (or fourth side surface or fourth outer surface) of the bobbin 110 can be disposed between the first and second sides of the bobbin 110 and can be located opposite each other.

[0052] The bobbin 110 may include at least one escape portion 115 for avoiding spatial interference with the protrusion 31 of the housing 140. The escape portion 115 may alternatively be expressed as a groove or an escape groove.

[0053] For example, the recess 115 may be formed in at least one of the corners of the bobbin 110. For example, the recess 115 may be formed in at least one of the corners of the bobbin 110 adjacent to the second side 11B (or the second side surface or the second outer surface) of the bobbin 110.

[0054] For example, the escape portion 115 may include a first escape portion 115A formed at one corner of the bobbin 110 adjacent to the second side portion 11B (or the second side surface or the second outer surface), and a second escape portion 115B formed at another corner of the bobbin 110 adjacent to the second side portion 11B (or the second side surface or the second outer surface). The escape portion 115 of the bobbin 110 may serve to prevent the bobbin 110 from rotating together with the protrusion 31 of the housing 140, which will be described later.

[0055] The protrusion 31 of the housing 140 may serve to restrict the degree of rotation of the bobbin 110 based on the optical axis. The protrusion 31 may also be expressed by terms such as a "rotation restricting portion," "stopper," "locking protrusion," "shock absorbing portion," or "buffer portion."

[0056] The protrusion 31 can suppress or prevent the bobbin 110 from rotating beyond a desired degree due to an external impact, can absorb the impact on the bobbin 110 and the housing 140 due to the external impact, can reduce the generation of foreign matter or particles due to the impact or collision, and can prevent deformation or damage to the bobbin 110 and / or the housing 140. The protrusion 31 can also function as a stopper in a direction perpendicular to the optical axis direction.

[0057] The bobbin 110 may include at least one groove 117 for locating or accommodating the ball member 310. The groove 117 may alternatively be referred to as a "receiving groove" or a "guide groove." At least a portion of the ball member 310 may contact the groove 117.

[0058] For example, the groove 117 may be formed on the second side 11B (or the second side surface or the second outer surface) of the bobbin 110. The groove 117 may have a recessed shape from the second side 11B (or the second side surface or the second outer surface) of the bobbin 110.

[0059] For example, groove 117 can be located between second seat 105B and the corner of bobbin 110 adjacent second side 11B.

[0060] For example, the groove 117 may include a first groove 117A and a second groove 117B. For example, the first groove 117A may be located between the second seat 105B and one corner of the bobbin 110 adjacent to the second side 11B. The second groove 117B may be located between the second seat 105B and another corner of the bobbin 110 adjacent to the second side 11B.

[0061] For example, the first groove 117A can be located between the second seat 105B and the first recess 115A, and the second groove 117B can be located between the second seat 105B and the second recess 115B.

[0062] For example, the groove 117 may have an opening that opens at the top surface of the bobbin 110. Also, for example, the lower portion of the groove 117 may be closed without opening at the bottom surface of the bobbin 110. The lower portion of the groove 117 may have a step in the optical axis direction relative to the bottom surface of the bobbin 110. For example, the lower portion of the groove 117 may be positioned higher than the bottom surface of the bobbin 110.

[0063] For example, the groove 117 may be formed to extend in the optical axis direction. For example, the groove 117 may extend from the upper surface to the lower surface of the bobbin 110, or may extend in the optical axis direction so as to be formed between the upper and lower surfaces of the bobbin 110.

[0064] For example, when viewed from above, the groove 117 may have a triangular shape, but is not limited to such, or may have a polygonal shape (e.g., a square or a pentagon, etc.), or, for example, the groove 117 may have a "V" or "U" shape.

[0065] In another embodiment, instead of forming the groove 117 in the bobbin 110, a groove for locating or receiving the ball member 310 may be formed on the inner surface of the housing 140.

[0066] For example, the groove 117 may be formed in at least one protrusion (or projection) 114 formed on the outer surface (or second outer surface) of the second side 11B of the bobbin 110. The protrusion 114 may include a first protrusion 114A in which a first groove 117A is formed, and a second protrusion 114B in which a second groove 117B is formed.

[0067] The first magnet 132 and the second magnet 134 are spaced apart from each other on the bobbin 110. For example, the second magnet 134 may be located on the opposite side of the first magnet 132.

[0068] For example, the first magnet 132 can be arranged on the first side 11A (first side or first outer surface) of the bobbin 110, and the second magnet 134 can be arranged on the first side 11A (first side or first outer surface) of the bobbin 110.

[0069] For example, the first magnet 132 can be positioned in the first seat 105A of the bobbin 110, and the second magnet 134 can be positioned in the second seat 105B of the bobbin 110.

[0070] The first magnet 132 may be disposed to correspond to or face the coil 120. An electromagnetic force may be generated by interaction between the first magnet 132 and the coil 120, and the bobbin 110 may move in the optical axis direction due to this electromagnetic force.

[0071] The first magnet 132 may include at least one magnet unit. In FIG. 1, the first magnet 132 includes a single magnet unit, but is not limited thereto, and in other embodiments, the first magnet 132 may include two or more magnet units.

[0072] The shape of each of the first magnet 132 and the second magnet 134 may correspond to the outer surfaces of the sides 11A, 11B of the bobbin 110, for example, the overall shape of a polyhedron (e.g., a cube or a rectangular parallelepiped), but is not limited to this.

[0073] The first magnet 132 may be a monopole magnetized magnet having two opposite polarities and a naturally formed interface between the opposite polarities.

[0074] For example, the first magnet 132 may be a monopole magnetized magnet divided into a north pole and a south pole in the optical axis direction. For example, the first magnet 132 may be a monopole magnetized magnet including a north pole and a south pole on a first surface facing the coil 120. The north pole of the first magnet 132 may be located at the top and the south pole at the bottom, but this is not limiting, and the positions may be reversed in other embodiments.

[0075] In another embodiment, the first magnet 132 may be a unipolar magnetized magnet that is divided into a north pole and a south pole in a direction perpendicular to the optical axis direction. For example, the first magnet according to another embodiment may be arranged so that a first surface facing the coil 120 is a north pole and a second surface opposite the first surface is a south pole, but is not limited to this. In another embodiment, the positions of the north pole and south pole may be reversed.

[0076] In yet another embodiment, the first magnet 132 can be a four-pole magnetized magnet or a two-pole magnetized magnet to increase the electromagnetic force.

[0077] For example, the first magnet 132 may include a first magnet including a north pole and a south pole, a second magnet including a south pole and a north pole, and a partition wall disposed between the first magnet and the second magnet. Here, the partition wall is a portion that is substantially non-magnetic and may include a section with almost no polarity, and may be filled with air or made of a non-magnetic material, and may also be referred to as a "neutral zone."

[0078] For example, the first magnet and the second magnet may face each other in the optical axis direction, and the first magnet and the second magnet may be arranged so that opposite polarities face each other in the optical axis direction.

[0079] For example, the first surface of the first magnet facing the first coil 120 may be a north pole (or a south pole), and the first surface of the second magnet facing the first coil 120 may be a south pole (or a north pole). For example, the first surface of the first magnet facing the first coil 120 and the first surface of the second magnet may have opposite polarities.

[0080] In other embodiments, for example, the first magnet and the second magnet may face each other in a direction perpendicular to the optical axis direction, and the first magnet and the second magnet may be arranged so that their opposite polarities face each other in a direction perpendicular to the optical axis direction.

[0081] The first surface of the first magnet 132 may be formed as a flat surface, but is not limited thereto, and may also include a curved surface, an inclined surface, or a tapered surface. For example, the first surface of the first magnet 132 may be a surface facing the coil 120.

[0082] The second magnet 134 may include at least one magnet unit. No. 2 magnet 134 The magnet unit may include, but is not limited to, one magnet unit. In other embodiments, the magnet unit may include two or more magnet units.

[0083] The second magnet 134 may be a unipolar magnetized magnet or a bipolar magnetized magnet. The description of the unipolar magnetization or bipolar magnetization of the first magnet 132 may be applied to the second magnet 134 or may be applied mutatis mutandis.

[0084] The strength of the magnetic force of the second magnet 134 may be different from the strength of the magnetic force of the first magnet 132. For example, but not limited to, the strength of the magnetic force of the second magnet 134 may be less than the strength of the magnetic force of the first magnet 132. In other embodiments, the strength of the magnetic force of the second magnet 134 may be the same as or greater than the strength of the magnetic force of the first magnet 132.

[0085] For example, the second magnet 134 may be formed of a different material than the first magnet 132. The second magnet 134 may include different components than the first magnet 132.

[0086] For example, the second magnet 134 may be made of a material having a magnetic force smaller than that of the material of the first magnet 132. 132 may be made of a first material, and the second magnet 134 may be made of a second material different from the first material. Here, the magnetic force of the first material may be greater than the magnetic force of the second material. The second magnet 134 may include at least one material selected from the group consisting of neodymium (NdFeB) and samarium cobalt.

[0087] In other embodiments, the second magnet 134 may be formed from the same material as the first magnet 132 .

[0088] The housing 140 is disposed within the cover member 300, and the housing 140 accommodates at least a portion of the bobbin 110 therein.

[0089] Referring to FIG. 3, the housing 140 supports the coil 120, the circuit board 190, and the yoke 136, and accommodates the bobbin 110 inside so that the AF moving part (or movable part) can move in the optical axis direction.

[0090] For example, the AF movement unit may include a bobbin 110 and a configuration coupled to or attached to the bobbin 110. For example, the AF movement unit may include the bobbin 110, a first magnet 132, and a second magnet 134. Alternatively, the AF movement unit may include a lens module 400 (see FIG. 14 ) coupled to or attached to the bobbin 110.

[0091] Alternatively, in other embodiments where the yoke 136 is disposed on the bobbin 110 and the second magnet 132 is disposed on the housing 140 , the AF moving portion can also include the bobbin 110 , the first magnet 132 , and the yoke 136 .

[0092] Alternatively, in yet another embodiment in which the coil 120 is disposed on the bobbin 110 and the first magnet 132 is disposed on the housing 140, the AF moving portion may include the bobbin 110, the coil 120, and the second magnet 134, and in yet another embodiment, the AF moving portion may include the yoke 136 instead of the second magnet 134.

[0093] The housing 140 may have an opening 201, hole, or cavity for receiving the bobbin 110. Here, the opening 201 of the housing 140 may be located in the center or central region of the housing 140. For example, the opening of the housing 140 may have the form of a through-hole that penetrates the housing 140 in the optical axis direction. The opening 201 of the housing 140 may have a shape corresponding to the shape of the bobbin 110, for example, a polygon (e.g., a square or octagon) or a circle (or oval), but is not limited thereto, and may have various shapes.

[0094] The housing 140 may include multiple sides 12A to 12D. The housing 140 may include a corner or corner portion located between two adjacent sides.

[0095] The housing 140 may include a first side 12A corresponding to the first side 11A of the bobbin 110, a second side 12B corresponding to the second side 11B of the bobbin 110, a third side 12C corresponding to the third side 11C of the bobbin 110, and a fourth side 12D corresponding to the fourth side 11D of the bobbin 110. The first side 12A (or first side or first outer surface) of the housing 140 may be located opposite the second side 12B (or second side or second outer surface) of the housing 140, and the third side 12C (or third side or third outer surface) of the housing 140 may be located opposite the fourth side 12D (or fourth side or fourth outer surface) of the housing 140.

[0096] Each of the first to fourth side portions 12A to 12D of the housing 140 may be disposed parallel to a corresponding one of the side plates of the cover member 300.

[0097] The housing 140 may include a first seat 141 formed on the second side 12B for disposing or seating the yoke 136. The first seat 141 may have the form of a hole, a groove, or a seating groove. For example, the first seat 141 may be a groove recessed from the second side 12B (or the second side or second outer side) of the housing 140, and may have an opening that opens to at least one of the upper surface or the lower surface of the housing 140. For example, the lower portion of the first seat 141 may be closed and not open to the lower surface of the housing 140.

[0098] An opening or hole 106 may be formed in the first side 12A (or first side surface or first outer surface) of the housing 140. At least a portion of the coil 120 may be disposed within the hole 106 of the housing 140. The hole 106 may be a through-hole that passes through the first side 12A.

[0099] In other embodiments, the housing 140 may have a groove or recess instead of the hole 106 for placement of the coil 120 .

[0100] A second seating portion 142 may be formed on the first side 12A (or first side surface or first outer surface) of the housing 140 to place or seat the circuit board 190 thereon.

[0101] For example, the second seat 142 may be a groove recessed from the first side 12A (or first side surface or first outer surface) of the housing 140, and may have an opening that opens to at least one of the upper surface or the lower surface of the housing 140. For example, the hole 106 may be formed in the bottom surface of the second seat 142 of the housing 140.

[0102] In other embodiments, the second seat 142 may include a protrusion for coupling with a circuit board, and the circuit board may have a hole for coupling with the protrusion of the housing.

[0103] The housing 140 may include a protrusion 31 that corresponds to or faces the escape groove 115 of the bobbin 110. The protrusion 31 may protrude from the inner surface or side surface of the housing 140 toward the bobbin 110.

[0104] For example, the protrusion 31 may be formed between the inner surfaces of two adjacent sides of the housing 140. For example, the protrusion 31 may include a first protrusion 31A corresponding to or facing the first recess 115A of the bobbin 110, and a second protrusion 31B corresponding to or facing the second recess 115B of the bobbin 110.

[0105] For example, the first protrusion 31A can be formed between the inner surface of the second side 12B of the housing 140 and the inner surface of the fourth side 12D, and the second protrusion 31B can be formed between the inner surface of the second side 12B of the housing 140 and the inner surface of the third side 12C.

[0106] 3, the protrusion 31 is formed to extend from the upper surface of the housing 140 to the lower surface of the housing 140, but is not limited to this. In other embodiments, one end (e.g., the upper end or upper surface) of the protrusion 117 may be spaced apart from the upper surface of the housing 140 and may be located below the upper surface of the housing 140. In still other embodiments, the other end (e.g., the lower end or lower surface) of the protrusion 117 may be spaced apart from the lower surface of the housing 140 and may be located above the lower surface of the housing 140.

[0107] 2, the escape portion 115 is formed to extend from the upper surface of the bobbin 110 to the lower surface of the bobbin 110, but is not limited thereto. In another embodiment, one end (e.g., the upper end) of the escape portion 115 may be spaced apart from the upper surface of the bobbin 110 and may be located below the upper surface of the bobbin 110. In yet another embodiment, the other end (e.g., the lower end or lower surface) of the protrusion 117 may be spaced apart from the lower surface of the bobbin 110 and may be located above the lower surface of the bobbin 110.

[0108] 3, the housing 140 may include a first stopper formed on the top, upper surface, or upper end, and a second stopper formed on the bottom, lower surface, or lower end. The first and second stoppers of the bobbin 110 and the housing 140 may alternatively be referred to as "bosses" or "protrusions."

[0109] At least one protrusion 112 (or projection) may be formed on the first side 11A (or first side surface or first outer surface) of the bobbin 110, and at least one groove 23 or groove corresponding to or facing the protrusion 112 of the bobbin 110 may be formed on the inner surface of the first side 12A of the housing 140.

[0110] For example, the bobbin 110 may include a first protrusion 112A (or a first projection) arranged on one side of the first side 11A (or a first side surface or a first outer surface), and a second protrusion 112B (or a second projection) arranged on the other side of the first side 11A (or a first side surface or a first outer surface).

[0111] For example, the first seat 105A can be located between the first protrusion 112A and the second protrusion 112B.

[0112] The housing 140 may include at least one groove 23 that protrudes from the inner surface of the first side portion 12A toward the bobbin 110 and corresponds to or faces at least one protrusion 112 of the bobbin 110 .

[0113] For example, the groove portion 23 of the housing 140 may include a first groove portion 23A located on one side of the inner surface of the first side portion 12A and adjacent to the fourth side portion 12D, and a second groove portion 23B located on the other side of the inner surface of the first side portion 12A and adjacent to the third side portion 12C.

[0114] For example, at least one protrusion 112 of the bobbin 110 can be disposed within at least one groove 23 of the housing 140 .

[0115] For example, the first protrusion 112A of the bobbin 110 can be disposed in the first groove 23A of the housing 140, and the second protrusion 112B of the bobbin 110 can be disposed in the second groove 23B of the housing 140.

[0116] The protrusion 112 of the bobbin 110 and the groove 23 of the housing 140 may serve to restrict the degree of rotation of the bobbin 110 around the optical axis. For example, the protrusion 112 may be expressed as a "rotation restricting portion," "stopper," "locking protrusion," "shock absorbing portion," or "buffer portion," etc.

[0117] The protrusion 112 can suppress or prevent the bobbin 110 from rotating beyond a desired degree due to an external impact, can mitigate the impact between the bobbin 110 and the housing 140 due to the external impact, can reduce the generation of foreign matter or particles due to the impact or collision, and can prevent deformation or damage to the bobbin 110 and / or the housing 140. In addition, the protrusion 31 can also function as a stopper in a direction perpendicular to the optical axis direction.

[0118] In other embodiments, grooves may be formed in the bobbin 110 instead of the protrusions 112 to prevent rotation, and protrusions may be formed in the housing 140 instead of the grooves 23 .

[0119] Additionally, the housing 140 may include at least one protrusion 41 (or projection) disposed within the first seat 105A of the bobbin 110. The protrusion 41 may protrude from the inner surface of the first side 12A of the housing 140 toward the first side 11A of the bobbin 110.

[0120] For example, the protrusion 41 (or projection) includes a first protrusion 41A and a second protrusion 41B. 41B may include:

[0121] Next, the coil 120 will be described. The coil 120 may be positioned to correspond to or face the first magnet 132 in a direction perpendicular to the optical axis direction. For example, the coil 120 may be disposed on the first side 12A of the housing 140 to correspond to or face the first magnet 132. Alternatively, for example, the coil 120 may be disposed between the first side 11A (or first side surface or first outer surface) of the bobbin 110 and the first side plate of the cover member 300.

[0122] For example, the coil 120 may be a driving AF (AutoFocus) coil that electromagnetically interacts with a first magnet 132 disposed on the bobbin 110 .

[0123] For example, the coil 120 can be disposed in the housing 140. For example, the coil 120 can be at least partially disposed within the hole 106 of the housing 140.

[0124] A drive signal (eg, a drive current or voltage) may be provided or applied to the coil 120 to generate an electromagnetic force through interaction with the first magnet 132 .

[0125] The drive signal applied to the coil 120 may be a DC signal, but is not limited to this, and may be an AC signal or may include a DC signal and an AC signal.

[0126] The electromagnetic force generated by the interaction between the coil 120 and the magnet 130 causes the AF moving part (or the movable part) to move in a first direction, for example, upward (+Z-axis direction) or downward (-Z-axis direction).

[0127] By controlling the strength and / or polarity (e.g., the direction of current flow) of the drive signal applied to the coil 120 to adjust the strength and / or direction of the electromagnetic force due to the interaction between the coil 120 and the first magnet 132, the movement of the AF moving part in the first direction can be controlled, thereby performing the autofocusing function.

[0128] The coil 120 may have a closed loop shape, for example, a ring shape having a central hole 120A. The coil 120 may be coupled to or mounted on a circuit board 190 disposed in the housing 140. For example, the coil 120 may be disposed on a first surface of the circuit board 190. For example, the first surface of the circuit board 190 may be the surface facing the first side 11A (or first side surface or first outer surface) of the bobbin 110.

[0129] For example, the coil 120 may be embodied in the form of a coil ring wound or wound clockwise or counterclockwise around an axis perpendicular to the optical axis.

[0130] The coil 120 may be electrically connected to the circuit board 190. For example, the coil 120 may be electrically connected to the terminals of the circuit board 190 by solder or a conductive adhesive. For example, the coil 120 may be electrically connected to two of the terminals 9-1 to 9-n (n is a natural number greater than 1) of the circuit board 190.

[0131] The circuit board 190 may be disposed on the first side 12A (or the first side surface or the first outer surface) of the housing 140. For example, at least a portion of the circuit board 190 may be disposed on a second seat 142 formed on the first side 12A of the housing 140.

[0132] For example, at least a portion of the first surface of the circuit board 190 can contact the bottom surface of the second seat 142 of the housing 140 .

[0133] The circuit board 190 may include a plurality of terminals 9-1 to 9-n (n is a natural number greater than 1) for electrically connecting to an external device or equipment. For example, the plurality of terminals 9-1 to 9-n may be disposed on a second surface of the circuit board 190. The second surface of the circuit board 190 may be the surface opposite to the first surface of the circuit board 190.

[0134] For example, the circuit board 190 may be a printed circuit board, or FPCB.

[0135] For example, the terminals 9-1 to 9-n may be arranged in a line on the lower end of the second surface of the circuit board 190, but are not limited thereto.

[0136] In the embodiment shown in FIG. 1, the circuit board 190 includes six terminals 9-1 to 9-n (for example, n=6), but the number of terminals is not limited to this.

[0137] The circuit board 190 may include additional circuit patterns, wiring, and / or pads for electrically connecting the position sensor 190 to the terminals 9-1 to 9-n.

[0138] The yoke 136 is disposed in the housing 140 to correspond to or face the second magnet 134. For example, the yoke 136 may be disposed to face the second magnet 134 in a direction perpendicular to the optical axis direction.

[0139] The yoke 136 may be disposed on the other side of the housing 140, excluding the first side 12A of the housing 140 on which the coil 120 is disposed. For example, the yoke 136 may be located on the opposite side of the coil 120. For example, the yoke 136 may be disposed on the second side 12B of the housing 140. For example, the second magnet 134 may be disposed between the second side 11B of the bobbin 110 and the yoke 136. Or, for example, the second magnet 134 may be disposed between the first magnet 132 and the yoke 136.

[0140] The yoke 136 may be disposed apart from the circuit board 190. For example, the circuit board 190 may be disposed on the first side 12A of the housing 140, and the first magnet 132 may be disposed between the circuit board 190 and the yoke 136.

[0141] For example, an attractive force may act in a direction perpendicular to the optical axis direction between the yoke 136 and the second magnet 134. A magnetic circuit may be formed between the yoke 136 and the second magnet 134.

[0142] The yoke 136 may be made of a material that is attracted to a magnet. For example, the yoke 136 may be a magnetic material. For example, the yoke 136 may be made of a metal material that is attracted to a magnet. Alternatively, for example, the yoke 136 may be made of a metal material that has magnetic properties.

[0143] Alternatively, for example, the yoke 136 can be a magnet. Here, the yoke 136 can be alternatively expressed as a "third magnet."

[0144] Since the yoke 136 is disposed in the housing 140, which is a fixed part, the bobbin 110 coupled to the second magnet 134 can be attracted toward the yoke 136 due to the attractive force acting between the yoke 136 and the second magnet 134.

[0145] The ball member 310 is pressed by the bobbin 110 and the housing 140 due to the interaction between the yoke 136 and the second magnet 134, and therefore the yoke 136 and the second magnet 134 can be referred to as a "pressing unit" or a "pressing member." When the bobbin 110 moves in the optical axis direction due to the pressing unit, contact between the bobbin 110 and the ball member 310, and contact between the housing 140 and the ball member 310 can be maintained.

[0146] The ball member 310 may be disposed between the bobbin 110 and the housing 140. The ball member 310 may alternatively be referred to as a "rolling member," a "ball," or a "ball bearing."

[0147] The ball member 310 can come into contact with the bobbin 110 and the housing 140, and can support movement of the bobbin 110 in the optical axis direction by rolling between the bobbin 110 and the housing 140. When the bobbin 110 moves in the optical axis direction, the ball member 310 can reduce friction between the bobbin 110 and the housing 140. By rolling the ball member 310, the bobbin 110 can come into contact with the ball member 310 and move in a sliding manner in the optical axis direction.

[0148] For example, the ball member 310 may be made of a metal material, a plastic material, or a resin material, but is not limited thereto.

[0149] The ball member 310 may have a circular shape and may have a diameter large enough to support movement of the bobbin 110 along the optical axis.

[0150] For example, the ball member 310 may be disposed between the second side 11B (or second side surface or second outer surface) of the bobbin 110 and the second side 12B of the housing 140. For example, the ball member 310 may be disposed on the opposite side of the first magnet 132.

[0151] For example, at least a portion of the ball member 310 may be disposed within the groove 117 of the bobbin 110. For example, the ball member 310 may be disposed between the groove 117 of the bobbin 110 and the inner surface of the housing 140 and may contact the groove 117 of the bobbin 110 and the inner surface of the housing 140.

[0152] Also, the ball member 310 can include at least one ball member. For example, the ball member 310 can include two or more ball members 310A, 310B.

[0153] For example, the ball member 310 may include a first ball member 310A positioned between the first groove 117A of the bobbin 110 and the second side 12B of the housing 140, and a second ball member 310B positioned between the second groove 117B of the bobbin 110 and the second side 12B of the housing 140.

[0154] For example, each of the ball members 310A and 310B may include a plurality of balls B1 to B3 and B4 to B6.

[0155] For example, at least a portion of the ball member 310 can be disposed within the first groove 117A of the bobbin 110 and can contact the first groove 117A. Additionally, at least another portion of the ball member 310 can contact the inner surface of the second side 12B of the housing 140.

[0156] FIG. 4b can be a variation of FIG. 4a. Referring to FIG. 4 b , the housing 140 may include a groove 116 that corresponds to or faces the groove 117 of the bobbin 110 .

[0157] For example, the groove 116 may be formed on the second side 12B of the housing 140. For example, the groove 116 may be formed on the inner surface of the second side 12B of the housing 140. The description of the shape of the groove 117 of the bobbin 110 may also be applied to the groove 116 of the housing 140, or may be applied by analogy.

[0158] For example, the groove 116 may include a first groove 116A that corresponds or faces the first groove 117A of the bobbin 110 and a second groove 116B that corresponds or faces the second groove 117B of the bobbin 110.

[0159] At least a portion of the ball member 310 can be disposed within the groove 117 of the bobbin 110 and can be in contact with the groove 117 of the bobbin 110. For example, there can be one or more points of contact between at least a portion of the ball member 310 and the groove 117 of the bobbin 110.

[0160] At least another portion of the ball member 310 can be disposed within the groove 116 of the housing 140 and can be in contact with the groove 116 of the housing 140. For example, there can be one or more points of contact between the at least another portion of the ball member 310 and the groove 116 of the housing 140.

[0161] Due to the attractive force acting between the yoke 136 and the second magnet 134, the ball member 310 can be pressed by the bobbin 110 and / or the housing 140, thereby stably supporting the bobbin 110.

[0162] 1, the yoke 136 is disposed on the housing 140, and the second magnet 134 is disposed on the bobbin 110, but this is not limiting. In other embodiments, the yoke 136 may be disposed on the second side 11B of the bobbin 110, and the second magnet 134 may be disposed on the second side 12B of the housing 140.

[0163] The cover member 300 can accommodate the housing 140 .

[0164] The cover member 300 may have a box shape that is open at the bottom and includes an upper plate 301 and a side plate 302, and the side plate 302 of the cover member 300 may extend downward from the upper plate 301 of the cover member 300. The shape of the upper plate 301 of the cover member 300 may be polygonal, for example, rectangular or octagonal, and the cover member 300 may have an opening in the upper plate to expose the lens or lens module 400 to external light.

[0165] The cover member 300 may be made of a non-magnetic material such as SUS or plastic to prevent adhesion to the magnets 132 and 134, but may also be made of a magnetic material to function as a yoke.

[0166] FIG. 5 a is a plan view of one embodiment of the first magnet 132 , the coil 120 , the second magnet 134 , and the yoke 136 .

[0167] 5a, for example, the vertical length L1 of the first magnet 132 may be greater than the vertical length L2 of the second magnet 134. This is because the first magnet 132 is a driving magnet for AF operation, and increasing the vertical length ensures sufficient electromagnetic force for AF drive.

[0168] In another embodiment, the longitudinal length L1 of the first magnet 132 can be the same as the longitudinal length L2 of the second magnet 134. In yet another embodiment, the longitudinal length of the first magnet 132 can be less than the longitudinal length of the second magnet 134.

[0169] The length L3 of the yoke 136 in the vertical direction can be greater than the length L2 of the second magnet 134 in the vertical direction.

[0170] For example, the area of ​​the first surface of the yoke 136 facing the second magnet 134 can be larger than the area of ​​the first surface of the second magnet 134 facing the yoke 136 .

[0171] For example, the vertical length L3 of the yoke 136 can be three times or more the vertical length L2 of the second magnet 134. Alternatively, for example, the vertical length L3 of the yoke 136 can be five times or more and ten times or less the vertical length L2 of the second magnet 134.

[0172] This is because increasing the length of the yoke 136 allows the yoke 136 to fully receive the magnetic force of the second magnet 134, thereby increasing the attractive force between the yoke 136 and the second magnet 134.

[0173] For example, the "vertical direction" may be a direction perpendicular to the optical axis direction and extending from the third side 11C to the fourth side 11D of the bobbin 110. Alternatively, the "vertical direction" may be a direction perpendicular to the optical axis direction and parallel to the first side 11A or the second side 11B of the bobbin 110.

[0174] The horizontal length W1 of the first magnet 132 may be greater than the horizontal length W2 of the second magnet 134. This is because the first magnet 132 is a driving magnet for AF operation, and increasing the horizontal length ensures sufficient electromagnetic force for AF drive. In another embodiment, the horizontal length W1 of the first magnet 132 may be the same as the horizontal length W2 of the second magnet 134. In yet another embodiment, the horizontal length W1 of the first magnet 132 may be less than the horizontal length W2 of the second magnet 134.

[0175] For example, the "horizontal direction" can be a direction perpendicular to the "vertical direction."

[0176] Alternatively, for example, the "lateral direction" can be a direction perpendicular to the optical axis direction from the first side 11A to the second side 11B of the bobbin 110. Alternatively, the "lateral direction" can be a direction perpendicular to the optical axis direction but parallel to the third side 11C or the fourth side 11D of the bobbin 110.

[0177] For example, the longitudinal length L1 of the first magnet 132 can be equal to or greater than the longitudinal length L4 of the coil 120. In other embodiments, the longitudinal length L1 of the first magnet 132 can be less than the longitudinal length L4 of the coil 120.

[0178] Also, for example, the lateral length W1 of the first magnet 132 can be equal to or greater than the lateral length W4 of the coil 120. In other embodiments, the lateral length W1 of the first magnet 132 can be less than the lateral length W4 of the coil 120.

[0179] When the yoke 136 is a magnet, in order for an attractive force to act between the yoke 136 and the second magnet 134, the opposing surfaces of the second magnet 134 and the yoke 136 may have opposite polarities.

[0180] 5a, the first surface of the second magnet 134 and the first surface of the yoke 136 can face each other, and the polarity of the first surface of the second magnet 134 can be a south pole, and the polarity of the first surface of the yoke 136 can be a north pole. Alternatively, for example, the polarity of the first surface of the second magnet 134 can be a north pole, and the polarity of the first surface of the yoke 136 can be a south pole.

[0181] Figure 5b is a plan view of another embodiment of the first magnet 132, the coil 120, the second magnet 134, and the yoke 136. The longitudinal lengths of the second magnet 134 and the yoke 136 in Figure 5b are different from those in Figure 5a.

[0182] Referring to FIG. 5b, the length L21 of the second magnet 134 in the longitudinal direction can be smaller than the length L31 of the yoke 136 in the longitudinal direction (L21 <L31)。

[0183] For example, the area of ​​the first surface of the yoke 136 facing the second magnet 134 can be smaller than the area of ​​the first surface of the second magnet 134 facing the yoke 136 .

[0184] The longitudinal length L21 of the second magnet 134 can be equal to or less than the longitudinal length L1 of the first magnet 132. In other embodiments, the longitudinal length L21 of the second magnet 134 can be greater than the longitudinal length L1 of the first magnet 132.

[0185] If the yoke 136 in FIG. 5b is a magnet, the second magnet 134 and the yoke in FIG. 5b 136 The polarity of the voltage Vcc can be applied in accordance with the description of FIG. 5a or by analogy.

[0186] In order to prevent tilt of the bobbin 110 during AF drive, the length of the second magnet 134 in the optical axis direction can be made different from the length of the yoke 136 in the optical axis direction.

[0187] Also, for example, the entire area of ​​the second magnet 134 can overlap with the yoke 136 in the direction perpendicular to the optical axis direction over the entire range in which the bobbin 110 moves in the optical axis direction.

[0188] FIG. 6a is a cross-sectional view of an embodiment of the first magnet 132, the coil 120, the second magnet 134, and the yoke 136 in the direction of the optical axis OA.

[0189] 6a, the length H1 of the first magnet 132 in the optical axis direction may be greater than the length H2 of the second magnet 134 in the optical axis direction. This is because the first magnet 132 is a driving magnet for AF operation, and by increasing the length in the optical axis direction, sufficient electromagnetic force for AF drive is ensured.

[0190] In another embodiment, the optical axis length of the first magnet 132 can be the same as the optical axis length of the second magnet 134. In yet another embodiment, the optical axis length of the first magnet 132 can be smaller than the optical axis length of the second magnet 134.

[0191] At least a portion of the first magnet 132 can overlap at least a portion of the second magnet 134 in a direction perpendicular to the optical axis OA. Here, the direction perpendicular to the optical axis OA can be a direction parallel to a line that passes through the optical axis OA and is perpendicular to the optical axis OA.

[0192] The length H3 of the yoke 136 in the optical axis direction can be made larger than the length H2 of the second magnet 134 in the optical axis direction (H3>H2).

[0193] For example, the length H3 of the yoke 136 in the optical axis direction can be 1.5 times or more the length H2 of the second magnet 134 in the optical axis direction. For example, the length H3 of the yoke 136 in the optical axis direction can be 2 times or more and 5 times or less the length H2 of the second magnet 134 in the optical axis direction.

[0194] The reason why H3 is set larger than H2 is to maintain a constant attractive force acting between the second magnet 134 and the yoke 136 in the section where the bobbin 110 moves in the optical axis direction for AF drive.

[0195] The attractive force acting between the second magnet 134 and the yoke 136 may be affected by the extent to which the yoke 136 and the second magnet 134 overlap each other in a direction perpendicular to the optical axis direction.

[0196] For example, if the entire area of ​​the second magnet 134 overlaps with the yoke 136 in a direction perpendicular to the optical axis direction throughout the entire range in which the bobbin 110 moves in the optical axis direction, the attractive force 201 acting between the second magnet 134 and the yoke 136 can be maintained constant.

[0197] On the other hand, if at least a portion of the second magnet 134 does not overlap with the yoke 136 in a direction perpendicular to the optical axis direction, the attractive force acting between the second magnet 134 and the yoke 136 is reduced, and the bobbin 110 may not be in close contact with the ball member 310. As a result, the bobbin 110 may tilt with respect to the optical axis, making it impossible to perform accurate AF operations.

[0198] Therefore, within the entire range in which the bobbin 110 moves in the optical axis direction, the upper end 26A (or upper surface or top) of the second magnet 134 can be located below the upper end 27A (or upper surface or top) of the yoke 136, and the lower end 26B (or underside or bottom) is the bottom end 27B (or under Face or under Here, the entire moving section may be the position (or displacement) of the bobbin 110 from the lowest point of the bobbin 110 to the highest point of the bobbin 110.

[0199] In other embodiments, at its highest point, the upper end 25A (or upper surface or upper portion) of the second magnet 134 can be flush with the upper end 27A (or upper surface or upper portion) of the yoke 136. Also, at its lowest point, the lower end 26B (or lower surface or lower portion) of the second magnet 134 can be flush with the lower end 27B (or lower surface or lower portion) of the yoke 136.

[0200] 6a, the lower end 27B of the yoke 136 is located above the bottom end 72 of the bobbin 110, but is not limited to this. In other embodiments, the lower end 27B of the yoke 136 may be located below the bottom end 72 of the bobbin 110 or at the same height as the bottom end 72 of the bobbin 110. For example, the bottom end 72 of the bobbin 110 may be the bottom surface of the bobbin 110 or the bottom end or bottom surface of a stopper provided on the bottom of the bobbin 110. For example, the lower end 27B of the yoke 136 may protrude downward from the bottom end 72 of the bobbin 110.

[0201] FIG. 6b shows the distance between the top end 26A of the second magnet 134 and the top end 27A of the yoke 136 when the bobbin 110 of FIG. 6a is at its lowest point.

[0202] Referring to FIG. 6b, at the lowest point, the first distance d1 in the optical axis direction between the upper end 26A of the second magnet 134 and the upper end 27A of the yoke 136 may be greater than the total stroke distance or movable distance of the bobbin 110 in the optical axis direction.

[0203] For example, the total stroke distance of the bobbin 110 may be the distance traveled by the bobbin 110 from its lowest point to its highest point.

[0204] For example, the lowest point may be the lowest point of the displacement of the bobbin 110 that moves in the optical axis direction for AF drive. For example, the lowest point may be the displacement or position of the bobbin 110 when the lower end of the bobbin 110 or a lower stopper of the bobbin 110 contacts or hits a fixed portion (e.g., the housing 140).

[0205] For example, the highest point may be the highest point of the displacement of the bobbin 110 that moves in the optical axis direction for AF drive. For example, the highest point may be the displacement or position of the bobbin 110 when the upper end of the bobbin 110 or an upper stopper of the bobbin 110 contacts or hits a fixed part (for example, the housing 140 or the cover member 300).

[0206] For example, the first distance d1 can be 1 to 3 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the first distance d1 can be 1.5 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction.

[0207] In other embodiments, for example, the first distance d1 can be equal to the total stroke distance of the bobbin 110 in the optical axis direction.

[0208] For example, at the lowest point, the lower end 26B of the second magnet 134 and the lower end 26C of the yoke 136 27B The second distance d2 in the optical axis direction between the bobbin 110 and the bobbin 110 may be 0 or greater, and may be 2 times the total stroke distance of the bobbin 110 in the optical axis direction or less.

[0209] For example, the second distance d2 can be 1 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction, or, for example, the second distance d2 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 110 in the optical axis direction.

[0210] FIG. 6c shows the distance between the top end 26A of the second magnet 134 and the top end 27A of the yoke 136 when the bobbin 110 of FIG. 6a is at its highest point.

[0211] Referring to FIG. 6c, for example, at the highest point, the third distance d3 in the optical axis direction between the upper end 26A of the second magnet 134 and the upper end 27A of the yoke 136 can be 0 or greater, and can be 2 times or less than the total stroke distance of the bobbin 110 in the optical axis direction.

[0212] For example, the third distance d3 can be 1 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the third distance d3 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 110 in the optical axis direction.

[0213] At the highest point, a fourth distance d4 in the optical axis direction between the lower end 26B of the second magnet 134 and the lower end 27B of the yoke 136 can be greater than the total stroke distance or movable distance of the bobbin 110 in the optical axis direction.

[0214] For example, the fourth distance d4 can be 1 to 3 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the fourth distance d4 can be 1.5 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction.

[0215] If the first distance d1 (or the fourth distance d4) is less than one time the total stroke distance, the attractive force between the second magnet 134 and the yoke 136 cannot be maintained constant, which may result in poor reliability of the AF drive. If the first distance d1 (or the fourth distance d4) is more than three times the total stroke distance, the size of the yoke 136 may increase unnecessarily, which may increase the size of the lens drive device and increase various costs.

[0216] In other embodiments, for example, the fourth distance d4 can be equal to the total stroke distance of the bobbin 110 in the optical axis direction.

[0217] As described in Figures 6b and 6c, even if the bobbin 110 moves in the optical axis direction for AF drive, the entire second magnet 134 overlaps with the yoke 136 in a direction perpendicular to the optical axis direction, so the pressing force pressing the first ball member 310 can be maintained constant, thereby suppressing tilt of the bobbin 110 and ensuring reliability of AF drive.

[0218] In another embodiment, the area where the second magnet 134 and the yoke 136 overlap each other in a direction perpendicular to the optical axis direction throughout the entire range in which the bobbin 110 moves in the optical axis direction may be 50% or more of the total volume of the second magnet 134.

[0219] FIG. 7a is a cross-sectional view of another embodiment of the first magnet 132, the coil 120, the second magnet 134, and the yoke 136 in the direction of the optical axis OA.

[0220] Referring to FIG. 7a, the length H21 of the second magnet 134 in the optical axis direction may be greater than the length H1 of the first magnet 132 in the optical axis direction (H21>H1).

[0221] The length H31 of the yoke 136 in the optical axis direction can be smaller than the length H21 of the second magnet 134 in the optical axis direction. The reason for making H21 larger than H31 is to maintain a constant attractive force acting between the second magnet 134 and the yoke 136 in the section where the bobbin 110 moves in the optical axis direction for AF drive.

[0222] Therefore, within the entire range in which the bobbin 110 moves in the optical axis direction, the upper end 27A (or upper surface or upper part) of the yoke 136 can be positioned lower than the upper end 26A (or upper surface or upper part) of the second magnet 134, and the lower end 27B (or lower surface or lower part) of the yoke 136 can be positioned higher than the lower end 26B (or upper surface or upper part) of the second magnet 134.

[0223] In other embodiments, at its highest point, the upper end 27A (or upper surface or upper portion) of the yoke 136 can be flush with the upper end 26A (or upper surface or upper portion) of the second magnet 134. Also, at its lowest point, the lower end 27B (or lower surface or lower portion) of the yoke 136 can be flush with the lower end 26B (or lower surface or lower portion) of the second magnet 134.

[0224] FIG. 7b shows the distance between the top end 26A of the second magnet 134 and the top end 27A of the yoke 136 when the bobbin 110 of FIG. 7a is at its lowest point.

[0225] Referring to FIG. 7b, at the lowest point, the first distance d11 in the optical axis direction between the upper end 26A of the second magnet 134 and the upper end 27A of the yoke 136 can be 0 or greater, and can be 2 times or less than the total stroke distance of the bobbin 110 in the optical axis direction.

[0226] For example, the first distance d11 can be 1 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the first distance d11 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 110 in the optical axis direction.

[0227] At the lowest point, a second distance d12 in the optical axis direction between the lower end 26B of the second magnet 134 and the lower end 27B of the yoke 136 may be greater than the total stroke distance or movable distance of the bobbin 110 in the optical axis direction.

[0228] For example, the second distance d12 can be 1 to 3 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the second distance d12 can be 1.5 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction.

[0229] In other embodiments, for example, the second distance d12 can be equal to the total stroke distance of the bobbin 110 in the optical axis direction.

[0230] FIG. 7c shows the distance between the top end 26A of the second magnet 134 and the top end 27A of the yoke 136 when the bobbin 110 of FIG. 7a is at its highest point.

[0231] Referring to FIG. 7c, at the highest point, the third distance d13 in the optical axis direction between the upper end 26A of the second magnet 134 and the upper end 27A of the yoke 136 may be greater than the stroke range or movable distance of the bobbin 110 in the optical axis direction.

[0232] For example, the third distance d13 can be set to be equal to or greater than 1 time and equal to or less than 3 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the third distance d13 can be set to be 1.5 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction.

[0233] In other embodiments, for example, the third distance d13 can be equal to the total stroke distance of the bobbin 110 in the optical axis direction.

[0234] For example, at the highest point, the fourth distance d14 in the optical axis direction between the lower end 26B of the second magnet 134 and the lower end 27A of the yoke 136 can be zero or greater, and can be two times the total stroke distance of the bobbin 110 in the optical axis direction or less.

[0235] For example, the fourth distance d14 can be 1 to 2 times the total stroke distance of the bobbin 110 in the optical axis direction. Alternatively, for example, the fourth distance d14 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 110 in the optical axis direction.

[0236] If the second distance d12 (or the third distance d13) is less than one time the total stroke distance, the attractive force between the second magnet 134 and the yoke 136 cannot be maintained constant, which may result in poor reliability of the AF drive. If the second distance d12 (or the third distance d13) is more than three times the total stroke distance, the size of the second magnet 134 may increase unnecessarily, which may increase the size of the lens drive device and increase various costs.

[0237] As described in Figures 7b and 7c, even if the bobbin 110 moves in the optical axis direction for AF drive, the entire yoke 132 overlaps with the second magnet 134 in a direction perpendicular to the optical axis direction, so the pressing force pressing the first ball member 310 can be maintained constant, thereby suppressing tilt of the bobbin 110 and ensuring reliability of AF drive.

[0238] Fig. 8a is a plan view of a lens driving device according to another embodiment, and Fig. 8b is a perspective view of the housing 140, ball member 320, and yoke 136 of Fig. 8a. The embodiments of Figs. 8a and 8b may be modifications of the embodiments of Figs. 3 and 4a.

[0239] The lens driving device according to the embodiment of FIGS. 8a and 8b may further include a ball member 320 in addition to the embodiment of FIGS. 3 and 4a.

[0240] The ball member 320 may be disposed between the first side 11A of the bobbin 110 and the first side 12A of the housing 140. For example, the housing 140 may include at least one groove 118A, 118B for disposing or receiving the ball member 320.

[0241] For example, the grooves 118A and 118B may be formed on the first side 12A of the housing 140. The grooves 118A and 118B may have a recessed shape from the inner surface of the first side 12A of the housing 140.

[0242] For example, the grooves 118A and 118B may be formed in the protrusion 41 (or projection) of the housing 140. For example, the grooves 118A and 118B may be formed in a side surface of the protrusion 41 of the housing 140 that faces the first side 11A (or first side surface or first outer surface) of the bobbin 110.

[0243] For example, grooves 118A, 118B can be located between coil 120 and a corner of housing 140 adjacent first side 12A of housing 140.

[0244] For example, the housing 140 may include a first groove 118A and a second groove 118B. For example, the first groove 118A may be located between the coil 120 and one corner of the housing 140 adjacent to the first side 12A, and the second groove 118B may be located between the coil 120 and the other corner of the housing 140 adjacent to the first side 12A.

[0245] For example, the first groove 118A may be formed in the first protrusion 41A of the housing 140, and the second groove 118B may be formed in the second protrusion 41B of the housing 140.

[0246] For example, the grooves 118A and 118B may have openings that are open on the upper surface of the housing 140. Also, for example, the lower portions of the grooves 118A and 118B may be closed rather than open on the lower surface of the housing 140. The lower portions of the grooves 118A and 118B may have a step in the optical axis direction relative to the lower surface of the housing 140. For example, the lower portions of the grooves 118A and 118B may be positioned higher than the lower surface of the housing 140.

[0247] For example, when viewed from above, the grooves 118A, 118B may be triangular in shape, but are not limited to such, and may be polygonal (e.g., square, pentagon, etc.) For example, the grooves 118A, 118B may be "V"-shaped or "U"-shaped grooves.

[0248] In other embodiments, instead of a groove being formed in the housing 140, a groove for positioning or accommodating the ball member 320 may be formed in the first side 11A (first side surface or first outer surface) of the bobbin 110.

[0249] The ball member 320 can be disposed between the grooves 118A, 118B of the housing 140 and the first side 11A of the bobbin 110. The ball member 320 can contact the grooves 118A, 118B of the housing 140 and the first side 11A of the bobbin 110.

[0250] At least a portion of the ball member 320 can be disposed within the grooves 118A, 118B of the housing 140 and can contact the grooves 118A, 118B of the housing 140. There can be one or more points of contact between the at least a portion of the ball member 320 and the grooves 118A, 118B of the housing 140.

[0251] The ball member 320 may include at least one ball member. For example, the ball member 320 may include two or more ball members 320A and 320B. For example, the ball member 320 may include a third ball member 320A and a fourth ball member 320B.

[0252] The third ball member 320A may be disposed or received in the first groove 118A of the housing 140, and the fourth ball member 320B may be disposed or received in the second groove 118B of the housing 140.

[0253] The description of the shape and material of the ball member 320 in FIG. 4a can be applied to the ball member 320 in FIGS. 8a and 8b or can be applied by analogy.

[0254] Compared to the embodiment of FIG. 4a, the embodiment of FIG. 8a and FIG. 8b can further reduce friction between the bobbin 110 and the housing 140 by using the ball member 320, thereby reducing the driving force required for normal AF operation and reducing power consumption.

[0255] As a variation of Figure 8a, the housing 140 can have the groove 116 described in Figure 4b, and the bobbin 110 can have the groove 119 described in Figure 9b.

[0256] FIG. 9a is a plan view of a lens driving device according to yet another embodiment, and FIG. 10 is a plan view of a first magnet 132, a coil 120, a second magnet 134, and a yoke 136 of the lens driving device of FIG.

[0257] The lens driving device according to the embodiment shown in Figures 9a and 10 may be a modified version of the lens driving device of Figures 4a and 8a. In the lens driving device of Figures 9a and 10, the ball member 310 of Figures 4a and 8a may be omitted, and a ball member 320 may be disposed between the first side 11A of the bobbin 110 and the first side 12A of the housing 140, and a repulsive force may act between the second magnet 134 and the yoke 136.

[0258] For example, the repulsive force acting between the second magnet 134 and the yoke 136 can cause the bobbin 110 (and / or the housing 140) to press the ball member 320, and the ball member 320 can stably support the bobbin 110.

[0259] The yoke 136 can push the second magnet 134 in a direction toward the ball member 320. 136 can push the bobbin 110 in the direction toward the ball member 320. Therefore, the bobbin 110 can be tightly attached to the ball member 320.

[0260] For example, the repulsive force between the yoke 136 and the second magnet 134 can be 5 gf or less. Alternatively, the repulsive force between the yoke 136 and the second magnet 134 can be 1 gf to 3 gf. Alternatively, the repulsive force between the yoke 136 and the second magnet 134 can be 0.1 gf to 2 gf.

[0261] The yoke is aligned perpendicular to the optical axis OA and parallel to the line passing through the center of the bobbin 110. 136 can overlap with the first magnet 132. For example, if the first magnet 132 is a bipolar magnet, the yoke is oriented in a direction perpendicular to the optical axis OA and parallel to a line passing through the center of the bobbin. 136 can overlap with the partition wall of the first magnet 132

[0262] Except for the explanation of the polarity of the second magnet 134 and the yoke 136 on which the attractive force acts, the explanation of FIGS. 5a to 7c can be applied or analogously applied to the embodiment of FIGS. 9a to 10.

[0263] In Figures 9a and 10, the yoke 136 can be a "magnet (e.g., a "third magnet")," and in order for a repulsive force to act between the yoke 136 and the second magnet 134 in Figure 10, the opposing surfaces of the second magnet 134 and the yoke 136 can have the same polarity.

[0264] 10, the first surface of the second magnet 134 and the first surface of the yoke 136 can face each other, and the polarity of the first surface of the second magnet 134 can be a north pole, and the polarity of the first surface of the yoke 136 can be a north pole. Alternatively, for example, the polarity of the first surface of the second magnet 134 can be a south pole, and the polarity of the first surface of the yoke 136 can be a south pole.

[0265] For example, the magnetic force strength of the magnetic yoke 136 can be less than the magnetic force strength of the first magnet 132. Alternatively, in other embodiments, the magnetic force strength of the magnetic yoke 136 can be the same as or greater than the magnetic force strength of the first magnet 132.

[0266] Also, for example, the strength of the magnetic force of the yoke 136, which is a magnet, can be greater than the strength of the magnetic force of the second magnet 134. Or, in other embodiments, for example, the strength of the magnetic force of the yoke 136, which is a magnet, can be the same as the strength of the magnetic force of the second magnet 134. In still other embodiments, for example, the strength of the magnetic force of the yoke 136, which is a magnet, can be greater than the strength of the magnetic force of the second magnet 134.

[0267] The yoke 136 and the first magnet 132 may be made of different materials or components, or in other embodiments, the yoke 136 and the first magnet 132 may be made of the same material or components.

[0268] The second magnet 132 and the yoke 136 may be made of the same material or components, or in other embodiments, the second magnet 132 and the yoke 136 may be made of different materials or components.

[0269] The relationship between the magnetic force strength of the first magnet 132 and the magnetic force strength of the second magnet 134 in the embodiment of FIG. 10 can be applied or analogized to that described in the embodiments of FIGS. 4a to 7c.

[0270] In the embodiments of Figures 9a and 10, a repulsive force acts between the first magnet 132, the separate second magnet 134, and the yoke 136, so the friction force between the bobbin 110 / housing 140 and the ball member 310 can be easily and freely designed or set.

[0271] Therefore, in the embodiments of Figures 9a and 10, regardless of ensuring the electromagnetic force required for AF drive, the friction force between the bobbin 110 / housing 140 and the ball member 310 can be easily and freely designed or set, and since the size of the yoke 136 is not restricted by the first magnet 132, the degree of freedom regarding the size of the yoke 136 can be improved, thereby improving the degree of freedom in the design of the lens driving device 100.

[0272] As mobile phones become more functional and have more pixels, the size of image sensors and the diameter of lenses are increasing. In particular, there is a trend toward increasing the diameter of lenses to realize higher pixel counts and improve image quality.

[0273] As the diameter of the lens increases, the weight of the AF moving part increases, so in order to ensure stable and reliable AF drive, the AF moving part must be stably supported and the tilt of the AF moving part based on the optical axis must be suppressed or the degree of tilt must be reduced. In a ball-type lens driving device that includes a ball member for supporting the bobbin, in order to stably support the AF moving part, it is necessary to easily adjust or set the friction force between the bobbin / housing and the ball member according to the weight of the lens.

[0274] FIG. 9b is a variation of FIG. 9a. Referring to FIG. 9 b , the bobbin 110 may include a groove 119 that corresponds to or faces the grooves 118 A, 118 B in the housing 140 .

[0275] For example, the groove 119 may be formed on the first side 11A of the bobbin 110. For example, the groove 119 may be formed on a side or outer surface of the first side 11A of the bobbin 110. The description of the shape of the groove 117 of the bobbin 110 may be applied to the groove 119 of the bobbin 110 or may be applied by analogy.

[0276] For example, the groove 119 may include a first groove 119A that corresponds or faces the first groove 118A of the housing 140 and a second groove 119B that corresponds or faces the second groove 118B of the housing 140 .

[0277] At least a portion of the ball members 320A, 320B can be disposed within the groove 119 of the bobbin 110 and can contact the groove 119 of the bobbin 110. For example, there can be one or more contact points between at least a portion of the ball members 320 and the groove 119 of the bobbin 110.

[0278] At least another portion of ball members 320A, 320B can be disposed in grooves 118A, 118B of housing 140 and can contact grooves 118A, 118B of housing 140. For example, there can be one or more contact points between at least another portion of ball members 320A, 320B and grooves 118A, 118B of housing 140.

[0279] FIG. 13 is a schematic cross-sectional view of a ball-type lens driving device 10A according to a comparative example.

[0280] 13, in Comparative Example 10A, a drive magnet 20 may be disposed or coupled to a first side of a bobbin 10, and a coil 40 may be disposed on a first side of a housing 30 to face the drive magnet 20. A circuit board 50 may be disposed on the first side of the housing 30, and the coil 40 may be disposed on a front surface of the circuit board 50, and a yoke 60 may be disposed on a rear surface of the circuit board 50. In Comparative Example 10A, a ball member (not shown) may be disposed between the first side of the bobbin 10 and the first side of a housing 140.

[0281] The driving magnet 20 must move the bobbin 10 in the optical axis direction through interaction with the coil 40, so it must be designed to have a size and magnetic force that can ensure the electromagnetic force required for AF drive.

[0282] The frictional force between the bobbin 10 / housing 30 and the ball member may be determined by the attractive force between the drive magnet 20 and the yoke 60. For example, if the attractive force increases, the frictional force between the bobbin 10 / housing 30 and the ball member may increase. On the other hand, if the attractive force decreases, the frictional force between the bobbin 10 / housing 30 and the ball member may decrease.

[0283] In the comparative example, the size and magnetic force of the drive magnet 20 for AF drive are already set, so the design of the drive magnet 20 may limit the attractive force between the drive magnet 20 and the yoke 60. The design of the drive magnet 20 may also limit the size of the yoke 60.

[0284] That is, the attractive force between the drive magnet 20 and the yoke 60 cannot be freely designed or set in order to adjust or control the frictional force between the bobbin 10 / housing 30 and the ball member.

[0285] However, in the embodiment, an attractive force acts between the first magnet 132, the separate second magnet 134, and the yoke 136, so that the friction force between the bobbin 110 / housing 140 and the ball member 310 can be easily and freely designed or set.

[0286] Therefore, in this embodiment, there is an advantage that the frictional force between the bobbin 110 / housing 140 and the ball member 310 can be easily and freely designed or set, regardless of whether the electromagnetic force required for AF drive is ensured.

[0287] Furthermore, since the size of the yoke 136 is not restricted by the first magnet 132, the degree of freedom in the size of the yoke 136 can be improved, and therefore the degree of freedom in the design of the lens driving device 100 can be improved.

[0288] FIG. 11a shows a position sensor 170 and a base 210 according to an embodiment.

[0289] 11a, the base 210 can be disposed below the housing 140 (or the bobbin 110). The base 210 can have an opening 21A corresponding to the opening 21 of the bobbin 110 and / or the opening 201 of the housing 140, and can have a shape that matches or corresponds to the cover member 300, for example, a rectangular shape.

[0290] The base 210 has a step at the bottom of its outer surface. 211 can be formed, and the step portion of the base 210 211 An adhesive may be applied to the step 211 of the base 210 to adhere and fix the cover member 300. Here, the step 211 of the base 210 may guide the lower end of the side plate 302 of the cover member 300 to be coupled thereto, and may face the lower end of the side plate 302 of the cover member 300. An adhesive or sealing material may be disposed or applied between the lower end of the side plate 302 of the base 210 and the step 211 of the base 210.

[0291] For example, the base 210 can be bonded to the housing 140 by an adhesive (not shown) such as epoxy or silicone.

[0292] The base 210 may have a groove 215 on the outer surface corresponding to the circuit board 190 into which at least a portion (for example, the lower end) of the circuit board 190 is placed, inserted, or seated.

[0293] For example, the groove 215 may be formed on a first outer surface of the base 210 corresponding to the first side 12A of the housing 140. For example, the terminals 9-1 to 9-n of the circuit board 190 may be disposed in the groove 215 of the base 210. In other embodiments, the base 210 may not have the groove 215.

[0294] The base 210 may have a seating groove 214 in which the position sensor 170 is disposed, inserted, or seated. For example, the seating groove 214 may have the form of a groove recessed from the upper surface of the base 210.

[0295] The position sensor 170 may be disposed on the base 210. For example, the position sensor 170 may be disposed on the upper surface (or groove 214) of ... To It can be applied or applied by analogy.

[0296] For example, the position sensor 170 may be disposed to correspond to the first magnet 132 .

[0297] For example, the position sensor 170 may be disposed at a position corresponding to the first magnet 132 in the optical axis direction. For example, the position sensor 170 may be disposed on the base 210 to sense the magnetic field of the first magnet 132.

[0298] For example, the position sensor 170 may at least partially overlap with the first magnet 132 in the optical axis direction. For example, the position sensor 170 may not overlap with the second magnet 134 and the yoke 136 in the optical axis direction. Furthermore, for example, the position sensor 170 may not overlap with the first magnet 132 in a direction perpendicular to the optical axis direction. Furthermore, for example, the position sensor 170 may not overlap with the second magnet 134 and the yoke 136 in a direction perpendicular to the optical axis direction.

[0299] In yet another embodiment, the position sensor 170 may not overlap with the first magnet 132 in the optical axis direction.

[0300] For example, the position sensor 170 may be disposed below the first magnet 132. Also, for example, the position sensor 170 may be disposed below the coil 120. Also, for example, the position sensor 170 may be located below the bobbin 110. For example, the position sensor 170 may be located below the lower end, bottom, or bottom surface of the bobbin 110.

[0301] The position sensor 170 can sense the strength of the magnetic field of the first magnet 132 attached to the bobbin 110 as the bobbin 110 moves, and can output an output signal (e.g., an output voltage) according to the sensed result. For example, the control unit of the camera device 200 or the control unit 780 of the terminal 200A can sense or detect the displacement of the bobbin 110 in the optical axis direction using the output signal of the position sensor 170.

[0302] The position sensor 170 may include a Hall sensor, but any sensor capable of sensing the strength of a magnetic field may be used.

[0303] The position sensor 170 may be implemented as a Hall sensor alone or as a driver including a Hall sensor. The driver-type position sensor may also include a temperature sensing element.

[0304] For example, if the position sensor 170 is implemented solely as a Hall sensor, the position sensor 170 may include two input terminals to which a driving signal or power supply is provided and two output terminals for outputting a sensing voltage (or output voltage).

[0305] For example, if the position sensor 170 is implemented solely as a Hall sensor, the circuit board 190 may include first and second terminals (e.g., 9-1 and 9-2) electrically connected to the two input terminals of the position sensor 170 and providing power or drive signals to the two input terminals. Here, the circuit board 190 may include third and fourth terminals (e.g., 9-3 and 9-4) electrically connected to the two output terminals of the position sensor 170 and receiving output signals from the position sensor 170 from the two output terminals. The circuit board 190 may also include fifth and sixth terminals (e.g., 9-5 and 9-6) electrically connected to the coil 120 and providing drive signals to the coil 120.

[0306] Alternatively, for example, when the position sensor 170 is in the form of a driver including a Hall sensor, the position sensor 170 may include first to fourth terminals for transmitting and receiving data to and from the outside using data communication using a protocol, for example, I2C communication, and fifth and sixth terminals for providing a drive signal to the coil 120. Here, the first and second terminals of the position sensor 170 may be terminals for receiving a power signal, and the third and fourth terminals of the position sensor 170 may be terminals for transmitting and receiving a clock signal and a data signal.

[0307] When the position sensor 170 is a driver type including a Hall sensor, the circuit board 190 may include first to fourth terminals (e.g., 9-1 to 9-4) electrically connected to the first to fourth terminals of the position sensor 170. In addition, the fifth and sixth terminals of the position sensor 170 may be electrically connected to the coil 120 via the circuit board 190, and a driving signal may be supplied to the coil 120 via the fifth and sixth terminals of the position sensor 170.

[0308] Figure 11b shows another arrangement of the position sensor 170. Figure 11b can be a variation of Figure 11a.

[0309] 11b, for example, the position sensor 170 may be disposed to correspond to the second magnet 134. For example, the position sensor 170 may be disposed at a position corresponding to the second magnet 134 in the optical axis direction. For example, the position sensor 170 may be disposed on the base 210 to sense the magnetic field of the second magnet 134.

[0310] For example, the position sensor 170 can at least partially overlap with the second magnet 134 in the optical axis direction. For example, the position sensor 170 may not overlap with the first magnet 132 and the yoke 136 in the optical axis direction. In yet other embodiments, the position sensor 170 may not overlap with the second magnet 134 in the optical axis direction.

[0311] For example, the position sensor 170 may be disposed below the second magnet 134. Also, for example, the position sensor 170 may be disposed below the coil 120.

[0312] The lens driving device 100 may include a current-carrying member electrically connected to the position sensor 170 , and the current-carrying member may include at least one terminal electrically connected to the position sensor 170 .

[0313] FIG. 12 a shows one embodiment of the electrical connection between the position sensor 170 and the current-carrying member 410 .

[0314] 12a, the current-carrying member 410 may be disposed on the base 210 and may be electrically connected to the position sensor 170. The current-carrying member 410 may be made of a conductive material, for example, a metal material.

[0315] For example, the current-carrying member 410 may be electrically connected to the circuit board 190. For example, the current-carrying member 410 may electrically connect the position sensor 170 and the circuit board 190. For example, the current-carrying member 410 may include a plurality of current-carrying portions for electrically connecting the position sensor 170 and the circuit board 190.

[0316] For example, the current-carrying member 410 may be a terminal, a wire, or a circuit pattern formed on the surface of the base 210 in a surface electrode manner.

[0317] Alternatively, for example, the current-carrying member 410 may be an insert terminal formed in the base 210 by insert injection or the like. For example, the current-carrying member 410 may include a plurality of terminals for electrically connecting the position sensor 170 and the circuit board 190.

[0318] For example, the current-carrying member 410 is a base 210 It can be placed on, but is not limited to,

[0319] Although FIG. 12a shows the embodiment of FIG. 11a, the description of the current-carrying member 410 of FIG. 12a also applies or can be applied by analogy to the embodiment of FIG. 11b.

[0320] FIG. 12b shows another embodiment of the electrical connection between the position sensor 170 and the current-carrying member 420. As shown in FIG.

[0321] 12b, the current-carrying member 420 may include a circuit board or a circuit member including at least one terminal electrically connected to the position sensor 170. For example, the current-carrying member 420 may be a printed circuit board or a flexible printed circuit board.

[0322] The current-carrying member 420 may be disposed on the base 210. For example, the current-carrying member 420 may be disposed on the upper surface of the base 210. The position sensor 170 may be disposed below the current-carrying member 420 and may be directly coupled to the current-carrying member 420.

[0323] For example, the position sensor 170 can be coupled to the underside of the current-carrying member 420 (e.g., a circuit board) by solder or a conductive adhesive, and the current-carrying member 420 For example, the position sensor 170 may be disposed between the current-carrying member 420 and the base 210.

[0324] For example, the current-carrying member 420 may include a terminal portion 423 that is bent or extends toward the outer surface of the base 210. The terminal portion 423 may include at least one terminal 425 that is electrically connected to the position sensor 170.

[0325] For example, the current-carrying member 420 may be disposed on the upper surface of the base 210 and may include a body 421 on which the position sensor 170 is disposed, and a terminal portion 423 bent or extending from the body 421 to the outer surface of the base 210. For example, the position sensor 170 may have the body 421 disposed on the lower surface, and a plurality of terminals 425 formed on the terminal portion 423.

[0326] For example, but not limited to, circuit board 190 and circuit board 420 may be separated or spaced apart from each other. In other embodiments, circuit board 190 and circuit board 420 may be integrally formed as a single substrate.

[0327] In other embodiments, the position sensor 170 may be disposed on the current-carrying member 420. For example, in other embodiments, the position sensor 170 may be coupled to the top surface of the current-carrying member 420 (e.g., a circuit board) by solder or a conductive adhesive, and the current-carrying member 420 It can also be electrically connected to

[0328] Although FIG. 12b shows the embodiment of FIG. 11b, the description of the current-carrying member 420 of FIG. 12b also applies or can be applied by analogy to the embodiment of FIG. 11a.

[0329] 11a, 11b, 12a, and 12b show the first magnet 132, the second magnet 134, and the yoke 136 according to the embodiment of FIG. 6a, but are not limited thereto, and the descriptions of FIGS. 11a, 11b, 12a, and 12b may be applied in whole or mutatis mutandis to the other embodiments shown in FIGS. 1 to 10.

[0330] In the embodiments of Figures 1 to 12b, the position sensor 170 is disposed on the base 210, but in other embodiments, the base 210 can be omitted, and the position sensor 170 can be disposed on the bottom surface of the housing 140 so as to correspond to, face, or overlap the first magnet 132 or the second magnet 134 in the optical axis direction.

[0331] Meanwhile, the lens driving device according to the above-described embodiment can be used in various fields, for example, a camera module, a camera, a camera device, or an optical device.

[0332] For example, the lens driving device 100 according to the embodiment may be included in an optical instrument that forms an image of an object in space using the properties of light, such as reflection, refraction, absorption, interference, and diffraction, with the goal of enhancing the visual acuity of the eye, recording and reproducing an image using a lens, or optically measuring, propagating, or transmitting an image. For example, the optical instrument according to the embodiment may be, but is not limited to, a mobile phone, a cellular phone, a smartphone, a portable smart device, a digital camera, a laptop computer, a digital terminal, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), a navigation system, or the like, and may be any device for taking images or photographs.

[0333] FIG. 14 shows an exploded perspective view of a camera device 200 according to an embodiment. Referring to FIG. 14, the camera device 200 may include a lens module 400, a lens driving device 100, a circuit board 800, and an image sensor 810.

[0334] The camera device 200 may further include a filter (not shown) located between the lens module 400 and the image sensor 810. For example, the filter may be disposed or seated on the base 210, but is not limited thereto. For example, a seating groove for seating or disposing the filter may be provided on the lower surface of the base 210. The base 210 may be coupled, attached, or fixed to the upper surface of the circuit board 800 by an adhesive member (not shown).

[0335] The lens module 400 may include a lens and / or a lens barrel, and may be attached to the bobbin 110 of the lens driver 100 .

[0336] For example, the lens module 400 may include one or more lenses and a lens barrel that houses the one or more lenses. However, the configuration of the lens module is not limited to a lens barrel, and any holder structure that can support one or more lenses may be used. The lens module can be coupled to the lens driver 100 and move together with the lens driver 100.

[0337] For example, the lens module 400 may be screwed to the lens driving device 100. The lens module 400 may be coupled to the lens driving device 100 by an adhesive (not shown), for example. Meanwhile, light passing through the lens module 400 may pass through a filter and be irradiated onto the image sensor 810.

[0338] The filter is a lens bar. Lu The filter can serve to block light of a specific frequency band from entering the image sensor 810. For example, the filter can be an infrared blocking filter, but is not limited thereto.

[0339] The circuit board 800 may be disposed under the lens driving device 100, and an image sensor 810 may be disposed or mounted on the circuit board 800. The image sensor 810 may receive an image contained in light incident through the lens driving device 100 and convert the received image into an electrical signal.

[0340] The circuit board 800 may be electrically connected to the circuit board 190 of the lens driving device 100. For example, the circuit board 800 may include a terminal 801 electrically connected to the terminals 9-1 to 9-n of the circuit board 190 of the lens driving device 100. For example, a driving signal to be supplied to the coil 120 and a driving signal (or a clock signal / data signal) to be supplied to the position sensor 170 may be transmitted to the terminal 801 of the circuit board 800 and the terminals 9-1 to 9-n of the circuit board 190 of the lens driving device 100. In addition, an output of the position sensor 170 may be transmitted from the terminals 9-1 to 9-n of the circuit board 190 of the lens driving device 100 to the terminal 801 of the circuit board 800.

[0341] The image sensor 810 may be positioned such that its optical axis coincides with that of the lens module 400. As a result, the image sensor 810 can acquire light that has passed through the lens module 400. The image sensor 810 can output the irradiated light as an image. The image sensor 810 may be, for example, a charge coupled device (CCD), a metal oxide semiconductor (MOS), a CPD, or a CID. However, the type of image sensor is not limited thereto.

[0342] The filter and the image sensor 810 may be spaced apart and disposed facing each other in the optical axis direction.

[0343] FIG. 15 is a camera device according to still another embodiment. 200-1 FIG.

[0344] 15, camera device 200-2 is a modification of the camera module of FIG. 14, in which position sensor 170 is not disposed on base 210 but is disposed on circuit board 800 of camera device 200-1.

[0345] For example, the position sensor 170 may be disposed between the base 210 and the circuit board 800. Alternatively, for example, the position sensor 170 may be disposed below the base 210. To avoid spatial interference with the position sensor 170, a groove or escape groove may be formed in the lower surface of the base 210.

[0346] For example, the position sensor 170 can be directly coupled to the circuit board 800 by solder or conductive adhesive, and can be electrically connected to the circuit board 800. Therefore, in FIG. 800 There is no need for separate current-carrying members 410 and 420 for electrically connecting the two.

[0347] For example, the position sensor 170 can correspond to, face, or overlap with the first magnet 132 in the optical axis direction.

[0348] Alternatively, in other embodiments, the position sensor 170 may correspond to, face, or overlap the second magnet 134 in the optical axis direction. The description of the position of the position sensor 170 in Figures 11a and 11b may be applied or may be applied by analogy to the embodiment of Figure 15.

[0349] 16 is an exploded perspective view of a camera device 200-2 according to yet another embodiment. The camera device 200-2 in FIG. 16 may be a modified example of the camera device 200 in FIG.

[0350] Referring to FIG. 16, in FIG. 16, the position sensor 170 is not disposed on the base 210 but is disposed on the circuit board 800 of the camera device 200-1, and the base 210 can be omitted.

[0351] The position sensor 170 may be disposed between the bobbin 110 (and / or the housing 140) and the circuit board 800. For example, the position sensor 170 may be disposed between the first magnet 132 or the second magnet 134 disposed on the bobbin 110 and the circuit board 800.

[0352] To avoid spatial interference with the position sensor 170, a groove or escape groove may be formed on the lower surface of the housing 140.

[0353] For example, the position sensor 170 may correspond to, face, or overlap the first magnet 132 or the second magnet 134 in the optical axis direction. The description of the position of the position sensor 170 in Figures 11a and 11b can be applied or analogously applied to the embodiment of Figure 16.

[0354] 15. The circuit board 800 and the position sensor 170 can be coupled and electrically connected to each other by applying or analogizing the description of FIG.

[0355] 17 is an exploded view of a lens driving device 1100 according to an embodiment, FIG. 18 is an exploded oblique view of the bobbin 1110, first magnet 1132, and second magnet 1134 of FIG. 17, FIG. 19 is an exploded oblique view of the housing 1140 and yoke 1136 of FIG. 17, and FIG. 20a is a plan view of the lens driving device 1100 of FIG. 17 excluding the cover member 1300.

[0356] 17 to 20a, the lens driving device 1100 may include a bobbin 1110, a first magnet 1132, a second magnet 1134, a housing 1140, a coil 1120, a ball member 1310, and a yoke 1136.

[0357] The lens driving device 1100 may further include a position sensor 1170 for AF feedback driving. The lens driving device 1100 may further include a circuit board 1190 electrically connected to the position sensor 1170 to supply a driving signal to the position sensor 1170 and receive an output from the position sensor 1170.

[0358] The lens driving device 1100 may further include a cover member 1300 for accommodating the housing 1140 .

[0359] The bobbin 1110 is for mounting a lens or a lens barrel, and can be disposed within the housing 1140. The bobbin 1110 can move in the optical axis OA direction or a first direction (e.g., Z-axis direction) due to electromagnetic interaction between the coil 1120 and the first magnet 1132. The bobbin 1110 can also be referred to as a "lens holder."

[0360] The bobbin 1110 may have an opening 1021 (see FIG. 23a) for mounting a lens or lens barrel. For example, the opening 1021 of the bobbin 1110 may be a through-hole, and its shape may be, but is not limited to, a circle, an ellipse, or a polygon.

[0361] 18, the bobbin 1110 may include at least one first stopper formed on its upper surface. For example, the first stopper may have a structure that protrudes from the upper surface of the bobbin 1110 in the optical axis direction or upward, thereby preventing the upper surface of the bobbin 1110 from directly hitting the inner surface of the upper plate 1301 of the cover member 1300. The bobbin 1110 may also include at least one second stopper formed on its lower surface.

[0362] The bobbin 1110 can include multiple side or outer surfaces.

[0363] For example, the bobbin 1110 may include a plurality of sides 1011A to 1011D. The bobbin 1110 may also include a corner or corner portion located between two adjacent sides.

[0364] The bobbin 1110 may include a first seat 1105A formed or disposed on a first side (first side or first outer surface) of the plurality of side portions (or side surfaces or outer surfaces) for disposing or seating the first magnet 1132. The first seat 1105A may have the form of a groove.

[0365] For example, the first seat 1105A may be a groove recessed from the first side 1011A (or first side or first outer surface) of the bobbin 1110, and may have an opening that opens to at least one of the upper surface or the lower surface of the bobbin 1110. Also, for example, the lower portion of the first seat 1105A may be closed and not open to the lower surface of the bobbin 1110.

[0366] The bobbin 1110 may include a second seat 1105B formed or disposed on a second side 1011B (or second side or second outer surface) of the plurality of side surfaces (or side surfaces or outer surfaces) to accommodate the second magnet 1134. The second seat 1105B may have the form of a groove recessed from the second side 1011B and may have an opening that opens to at least one of the upper surface or the lower surface of the bobbin 1110. Also, for example, the lower portion of the second seat 1105B may be closed and not open to the lower surface of the bobbin 1110.

[0367] For example, the second side 1011B (or second side or second outer surface) of the bobbin 1110 can be located opposite the first side 1011A (or first side or first outer surface) of the bobbin 1110.

[0368] In addition, the third side 1011C (or third side surface or third outer surface) and the fourth side 1011D (or fourth side surface or fourth outer surface) of the bobbin 1110 can be disposed between the first and second sides of the bobbin 1110 and can be positioned opposite each other.

[0369] The bobbin 1110 may include at least one escape portion 1115 for avoiding spatial interference with the protrusion 1031 of the housing 1140. The escape portion 1115 may alternatively be expressed as a groove or an escape groove.

[0370] For example, the recess 1115 may be formed in at least one of the corners of the bobbin 1110. For example, the recess 1115 may be formed in at least one of the corners of the bobbin 1110 adjacent to the second side 1011B (or second side surface or second outer surface) of the bobbin 1110.

[0371] For example, the escape portion 1115 is a first escape portion formed at one corner of the bobbin 1110 adjacent to the second side portion 1011B (or the second side surface or the second outer surface). 1115A and a second escape portion 1115B formed at another corner of the bobbin 1110 adjacent to the second side portion 1011B (or the second side surface or the second outer surface). The escape portion 1115 of the bobbin 1110 may function to prevent the bobbin 1110 from rotating together with a protrusion 1031 of the housing 1140, which will be described later.

[0372] The protrusion 1031 of the housing 1140 may serve to restrict the degree of rotation of the bobbin 1110 based on the optical axis. The protrusion 1031 may also be expressed by terms such as "rotation restriction portion," "stopper," "locking protrusion," "shock absorbing portion," or "buffer portion."

[0373] The protrusion 1031 can suppress or prevent the bobbin 1110 from rotating beyond a desired degree due to an external impact, can mitigate the impact between the bobbin 1110 and the housing 1140 due to the external impact, can reduce the generation of foreign matter or particles due to the impact or collision, and can prevent deformation or damage to the bobbin 1110 and / or the housing 1140. The protrusion 1031 can also function as a stopper in a direction perpendicular to the optical axis direction.

[0374] The bobbin 1110 may include at least one groove 1117 for locating or accommodating the ball member 1310. The groove 1117 may alternatively be referred to as a "receiving groove" or a "guide groove." At least a portion of the ball member 1310 may contact the groove 1117.

[0375] For example, the groove 1117 may be formed on the second side 1011B (or second side surface or second outer surface) of the bobbin 1110. The groove 1117 may have a recessed shape from the second side 1011B (second side surface or second outer surface) of the bobbin 1110.

[0376] For example, the groove 1117 can be located between the second seat 1105B and the corner of the bobbin 1110 adjacent the second side 1011B.

[0377] For example, the groove 1117 may include a first groove 1117A and a second groove 1117B. For example, the first groove 1117A may be located between the second seat 1105B and one corner of the bobbin 1110 adjacent to the second side 1011B, and the second groove 1117B may be located between the second seat 1105B and another corner of the bobbin 1110 adjacent to the second side 1011B.

[0378] For example, the first groove 1117A is connected to the second seating portion 1105B and the first escape portion 1105C. 1115A and the second groove 1117B can be located between the second seating portion 1105B and the second relief portion 1115B.

[0379] For example, the groove 1117 may have an opening that opens at the top surface of the bobbin 1110. Also, for example, the lower part of the groove 1117 may be closed without opening at the bottom surface of the bobbin 1110. The lower part of the groove 1117 may have a step in the optical axis direction relative to the bottom surface of the bobbin 1110. For example, the lower part of the groove 1117 may be positioned higher than the bottom surface of the bobbin 1110.

[0380] For example, the groove 1117 can be formed to extend in the optical axis direction. For example, the groove 1117 can extend from the upper surface to the lower surface of the bobbin 1110 or can extend in the optical axis direction so as to be formed between the upper and lower surfaces of the bobbin 1110.

[0381] For example, when viewed from above, the groove 1117 may be triangular in shape, but is not limited to such, and may also be polygonal (e.g., square, pentagon, etc.), or, for example, the groove 1117 may have a "V" or "U" shape.

[0382] In another embodiment, rather than forming the groove 1117 in the bobbin 1110, a groove for locating or receiving the ball member 1310 may be formed on the inner surface of the housing 1140.

[0383] For example, the groove 1117 may be formed in at least one protrusion 1114 (or projection) formed on the outer surface (or second outer surface) of the second side 1011B of the bobbin 1110. The protrusion 1114 may include a first protrusion 1114A in which a first groove 1117A is formed, and a second protrusion 1114B in which a second groove 1117B is formed.

[0384] The first magnet 1132 and the second magnet 1134 are spaced apart from each other on the bobbin 1110. For example, the second magnet 1134 may be located on the opposite side of the first magnet 1132.

[0385] For example, the first magnet 1132 can be positioned on the first side 1011A (first side or first outer surface) of the bobbin 1110, and the second magnet 1134 can be positioned on the first side 1011A (first side or first outer surface) of the bobbin 1110.

[0386] For example, the first magnet 1132 can be positioned in a first seat 1105A of the bobbin 1110, and the second magnet 1134 can be positioned in a second seat 1105B of the bobbin 1110.

[0387] The first magnet 1132 may be disposed to correspond to or face the coil 1120. An electromagnetic force may be generated by interaction between the first magnet 1132 and the coil 1120, and the bobbin 1110 may move in the optical axis direction due to this electromagnetic force.

[0388] The first magnet 1132 may include at least one magnet unit. In FIG. 1, the first magnet 1132 includes a single magnet unit, but is not limited to this. In other embodiments, the first magnet 1132 may include two or more magnet units.

[0389] The shape of each of the first magnet 1132 and the second magnet 1134 can be a shape corresponding to the outer surface of the sides 1011A, 1011B of the bobbin 1110, for example, the overall shape of a polyhedron (e.g., a cube or rectangular prism), but is not limited to this.

[0390] The first magnet 1132 may be a monopole magnetized magnet having two opposite polarities and a naturally formed interface between the opposite polarities.

[0391] For example, the first magnet 1132 may be a monopole magnetized magnet divided into a north pole and a south pole in the optical axis direction. For example, the first magnet 1132 may be a monopole magnetized magnet in which a first surface facing the coil 1120 includes a north pole and a south pole. The north pole of the first magnet 1132 may be located at the top and the south pole at the bottom, but this is not a limitation. In other embodiments, the positions may be reversed.

[0392] In another embodiment, the first magnet 1132 may be a unipolar magnetized magnet divided into a north pole and a south pole in a direction perpendicular to the optical axis. For example, the first magnet according to another embodiment may be arranged so that a first surface facing the coil 1120 is the north pole and a second surface opposite the first surface is the south pole, but is not limited to this. In another embodiment, the positions of the north pole and south pole may be reversed.

[0393] In yet another embodiment, the first magnet 1132 can be a four-pole magnet or a two-pole magnet to improve the electromagnetic force.

[0394] For example, the first magnet 1132 may include a first magnet including a north pole and a south pole, a second magnet including a south pole and a north pole, and a partition wall disposed between the first magnet and the second magnet. Here, the partition wall is a portion that is substantially non-magnetic and may include a section with almost no polarity, and may be filled with air or made of a non-magnetic material, and may also be referred to as a "neutral zone."

[0395] For example, the first magnet and the second magnet may face each other in the optical axis direction, and the first magnet and the second magnet may be arranged so that opposite polarities face each other in the optical axis direction.

[0396] For example, the first surface of the first magnet facing the first coil 1120 may be a north pole (or a south pole), and the first surface of the second magnet facing the first coil 1120 may be a south pole (or a north pole). For example, the first surface of the first magnet facing the first coil 1120 and the first surface of the second magnet may have opposite polarities.

[0397] In other embodiments, for example, the first magnet and the second magnet may face each other in a direction perpendicular to the optical axis direction, and the first magnet and the second magnet may be arranged so that their opposite polarities face each other in a direction perpendicular to the optical axis.

[0398] The first surface of the first magnet 1132 may be formed as a flat surface, but is not limited thereto. The first surface of the first magnet 1132 may also include a curved surface, an inclined surface, or a tapered surface. For example, the first surface of the first magnet 1132 may be the surface facing the coil 1120.

[0399] The second magnet 1134 can include at least one magnet unit. Figure 17 So, the first 2 magnet 1134 The magnet unit may include, but is not limited to, one magnet unit. In other embodiments, the magnet unit may include two or more magnet units.

[0400] The second magnet 1134 may be a unipolar magnetized magnet or a bipolar magnetized magnet. The description of the unipolar magnetization or bipolar magnetization of the first magnet 1132 may be applied to the second magnet 1134 or mutatis mutandis.

[0401] The strength of the magnetic force of the second magnet 1134 may be different from the strength of the magnetic force of the first magnet 1132. For example, but not limited to, the strength of the magnetic force of the second magnet 1134 may be less than the strength of the magnetic force of the first magnet 1132. In other embodiments, the strength of the magnetic force of the second magnet 1134 may be the same as or greater than the strength of the magnetic force of the first magnet 1132.

[0402] For example, the second magnet 1134 may be formed from a different material than the first magnet 1132. The second magnet 1134 may include different components than the first magnet 1132.

[0403] For example, the second magnet 1134 may be made of a material having a magnetic force weaker than that of the material of the first magnet 1132. For example, the first magnet 1132 may be made of a first material, and the second magnet 1134 may be made of a second material different from the first material. Here, the magnetic force of the first material may be stronger than that of the second material. The second magnet 1134 may include at least one material selected from the group consisting of neodymium (NdFeB) and samarium cobalt.

[0404] In other embodiments, the second magnet 1134 can be made of the same material as the first magnet 1132 .

[0405] The housing 1140 is disposed within the cover member 1300, and the housing 1140 accommodates at least a portion of the bobbin 1110 therein.

[0406] Referring to FIG. 19, the housing 1140 supports the coil 1120, the circuit board 1190, and the yoke 1136, and accommodates the bobbin 1110 inside so that the AF moving part (or movable part) can move in the optical axis direction.

[0407] For example, the AF movement unit may include a bobbin 1110 and a configuration coupled or attached to the bobbin 1110. For example, the AF movement unit may include a bobbin 1110, a first magnet 1132, and a second magnet 1134. Alternatively, the AF movement unit may include a lens module 400 (see FIG. 12 ) coupled or attached to the bobbin 1110.

[0408] Alternatively, the yoke 1136 is disposed on the bobbin 1110 and the second magnet 1132 In other embodiments where the AF moving portion is disposed in the housing 1140, the AF moving portion may also include the bobbin 1110, the first magnet 1132, and the yoke 1136.

[0409] Alternatively, in yet another embodiment in which the coil 1120 is disposed on the bobbin 1110 and the first magnet 1132 is disposed on the housing 1140, the AF moving portion may include the bobbin 1110, the coil 1120, and the second magnet 1134, and in yet another embodiment, the AF moving portion may include a yoke 1136 instead of the second magnet 1134.

[0410] The housing 1140 may have an opening 1201, hole, or cavity for receiving the bobbin 1110. Here, the opening 1201 of the housing 1140 may be located in the center or central region of the housing 1140. For example, the opening of the housing 1140 may have the form of a through-hole that penetrates the housing 1140 in the optical axis direction. The opening 1201 of the housing 1140 may have a shape corresponding to the shape of the bobbin 1110, for example, a polygon (e.g., a square or octagon) or a circle (or oval), but is not limited thereto, and may have various shapes.

[0411] The housing 1140 may include multiple sides 1012A-1012D. The housing 1140 may include a corner or corner portion located between two adjacent sides.

[0412] The housing 1140 may include a first side 1012A corresponding to the first side 1012A of the bobbin 1110, a second side 1012B corresponding to the second side 1011B of the bobbin 1110, a third side 1012C corresponding to the third side 1011C of the bobbin 1110, and a fourth side 1012D corresponding to the fourth side 1011D of the bobbin 1110. The first side 1012A (or first side or first outer surface) of the housing 1140 may be located opposite the second side 1012B (or second side or second outer surface) of the housing 1140, and the third side 1012C (or third side or third outer surface) of the housing 1140 may be located opposite the fourth side 1012D (or fourth side or fourth outer surface) of the housing 1140.

[0413] Each of the first to fourth side portions 1012A to 1012D of the housing 1140 may be disposed parallel to a corresponding one of the side plates of the cover member 1300.

[0414] The housing 1140 may include a first seat 1141 formed on the second side 1012B for disposing or seating the yoke 1136. The first seat 1141 may have the form of a hole, a groove, or a seating groove. For example, the first seat 1141 may be a groove recessed from the second side 1012B (or the second side or second outer side) of the housing 1140, and may have an opening that opens to at least one of the top and bottom surfaces of the housing 1140. For example, the lower part of the first seat 1141 may be closed and not open to the bottom surface of the housing 1140.

[0415] An opening or hole 1106 may be formed in the first side 1012A (or first side surface or first outer surface) of the housing 1140. At least a portion of the coil 1120 may be disposed within the hole 1106 of the housing 1140. The hole 1106 may be a through-hole that penetrates the first side 1012A. Because the hole 1106 has the form of a through-hole, the housing 1140 is not interposed between the position sensor 1170 and the first magnet 1132, thereby increasing the output of the position sensor 1170 and improving the sensitivity of the position sensor 1170.

[0416] In other embodiments, the housing 1140 may have grooves or recesses instead of holes for placement of the coil 1120 .

[0417] A second seat 1142 may be formed on the first side 1012A (or first side surface or first outer surface) of the housing 1140 to place or seat the circuit board 1190 .

[0418] For example, the second seat 1142 may be a groove recessed from the first side 1012A (or first side or first outer surface) of the housing 1140, and may have an opening that opens to at least one of the top and bottom surfaces of the housing 1140. For example, the hole 1106 may be formed in the bottom surface of the second seat 1142 of the housing 1140.

[0419] In other embodiments, the second seat 1142 may include a protrusion for coupling with a circuit board, and the circuit board may have a hole for coupling with the protrusion of the housing.

[0420] The housing 1140 has an escape groove for the bobbin 1110. 1115 The protrusion 1031 may protrude from the inner surface or side of the housing 1140 towards the bobbin 1110.

[0421] For example, the protrusion 1031 may be formed between the inner surfaces of two adjacent sides of the housing 1140. For example, the protrusion 1031 may include a first protrusion 1031A corresponding to or facing the first recess 115A of the bobbin 1110, and a second protrusion 1031B corresponding to or facing the second recess 1115B of the bobbin 1110.

[0422] For example, the first protrusion 1031A can be formed between the inner surface of the second side 1012B and the inner surface of the fourth side 1012D of the housing 1140, and the second protrusion 1031B can be formed between the inner surface of the second side 1012B and the inner surface of the third side 1012C of the housing 1140.

[0423] 19, the protrusion 1031 is formed to extend from the upper surface of the housing 1140 to the lower surface of the housing 1140, but is not limited to this. In other embodiments, one end (e.g., upper end or upper surface) of the protrusion 1031 may be separated from the upper surface of the housing 1140 and may be located below the upper surface of the housing 1140. In still other embodiments, the other end (e.g., lower end or lower surface) of the protrusion 1031 may be separated from the lower surface of the housing 1140 and may be located above the lower surface of the housing 1140.

[0424] 18, the escape portion 1115 is formed to extend from the upper surface of the bobbin 1110 to the lower surface of the bobbin 1110, but is not limited thereto. In other embodiments, one end (e.g., the upper end) of the escape portion 1115 may be spaced apart from the upper surface of the bobbin 1110 and may be located below the upper surface of the bobbin 1110. In still other embodiments, Avoidance part 1115 The other end (eg, the lower end or lower surface) of the bobbin 1110 may be spaced apart from the lower surface of the bobbin 1110 and may be positioned on the lower surface of the bobbin 1110.

[0425] 19, the housing 1140 may include a first stopper formed on the top, upper surface, or upper end, and a second stopper formed on the bottom, lower surface, or lower end. The first and second stoppers of the bobbin 1110 and the housing 1140 may alternatively be expressed as "bosses" or "protrusions."

[0426] At least one protrusion 1112 (or projection) may be formed on the first side 1011A (or first side surface or first outer surface) of the bobbin 1110, and at least one groove 1023 or groove corresponding to or facing the protrusion 1112 of the bobbin 1110 may be formed on the inner surface of the first side 1012A of the housing 1140.

[0427] For example, the bobbin 1110 may include a first protrusion 1112A (or a first projection) arranged on one side of the first side 1011A (or a first side surface or a first outer surface), and a second protrusion 1112B (or a second projection) arranged on the other side of the first side 1011A (or a first side surface or a first outer surface).

[0428] For example, the first seat 1105A can be located between the first protrusion 1112A and the second protrusion 1112B.

[0429] The housing 1140 may include at least one groove 1023 that protrudes from the inner surface of the first side 1012A toward the bobbin 1110 and corresponds to or faces the at least one protrusion 1112 of the bobbin 1110.

[0430] For example, the groove portion 1023 of the housing 1140 may include a first groove portion 1023A located on one side of the inner surface of the first side portion 1012A and adjacent to the fourth side portion 1012D, and a second groove portion 1023B located on the other side of the inner surface of the first side portion 1012A and adjacent to the third side portion 1012C.

[0431] For example, at least one protrusion 1112 of the bobbin 1110 can be disposed within at least one groove 1023 of the housing 1140 .

[0432] For example, the first protrusion 1112A of the bobbin 1110 can be positioned within the first groove 1023A of the housing 1140, and the second protrusion 1112B of the bobbin 1110 can be positioned within the second groove 1023B of the housing 1140.

[0433] The protrusion 1112 of the bobbin 1110 and the groove 1023 of the housing 1140 may serve to restrict the degree of rotation of the bobbin 1110 based on the optical axis. For example, the protrusion 1112 may also be expressed by terms such as a "rotation restriction portion," "stopper," "locking protrusion," "shock absorbing portion," or "buffer portion."

[0434] The protrusion 1112 can suppress or prevent the bobbin 1110 from rotating beyond a desired degree due to an external impact, can mitigate the impact between the bobbin 1110 and the housing 1140 due to the external impact, can reduce the generation of foreign matter or particles due to the impact or collision, and can prevent deformation or damage to the bobbin 1110 and / or the housing 1140. In addition, the protrusion 1031 can also function as a stopper in a direction perpendicular to the optical axis direction.

[0435] In other embodiments, grooves may be formed in the bobbin 1110 instead of the protrusions 1112 to prevent rotation, and protrusions may be formed in the housing 1140 instead of the grooves 1112 .

[0436] Additionally, the housing 1140 may include at least one protrusion 1041 (or projection) disposed within the first seat 1105A of the bobbin 1110. The protrusion 1041 may protrude from an inner surface of the first side 1012A of the housing 1140 toward the first side 1011A of the bobbin 1110.

[0437] For example, the protrusion 1041 (or projection) includes a first protrusion 1041A and a second protrusion 1041B may include:

[0438] Next, the coil 1120 will be described. The coil 1120 may be positioned to correspond to or face the first magnet 1132 in a direction perpendicular to the optical axis direction. For example, the coil 1120 may be disposed on the first side 1012A of the housing 1140 to correspond to or face the first magnet 1132. Alternatively, for example, the coil 1120 may be disposed between the first side 1011A (or first side surface or first outer surface) of the bobbin 1110 and the first side plate of the cover member 1300.

[0439] For example, the coil 1120 may be a driving AF (AutoFocus) coil that electromagnetically interacts with a first magnet 1132 disposed on the bobbin 1110 .

[0440] For example, the coil 1120 can be disposed in the housing 1140. For example, the coil 1120 can be at least partially disposed within the hole 1106 in the housing 1140.

[0441] A drive signal (eg, a drive current or voltage) may be provided or applied to the coil 1120 to generate an electromagnetic force through interaction with the first magnet 1132 .

[0442] The drive signal applied to the coil 1120 may be a DC signal, but is not limited to such, and may also include an AC signal or a DC and AC signal.

[0443] Coil 1120 and magnet 1130 The AF moving part (or the movable part) can move in a first direction, for example, an upward direction (+Z axis direction) or a downward direction (-Z axis direction) by the electromagnetic force due to the interaction between them.

[0444] By controlling the strength and / or polarity (e.g., the direction of current flow) of the drive signal applied to the coil 1120 and adjusting the strength and / or direction of the electromagnetic force due to the interaction between the coil 1120 and the first magnet 1132, the movement of the AF moving part in the first direction can be controlled, thereby performing the autofocusing function.

[0445] The coil 1120 may have a closed loop shape, for example, a ring shape with a central hole 1120A. The coil 1120 may be coupled to or mounted on a circuit board 1190 disposed in the housing 1140. For example, the coil 1120 may be disposed on a first surface of the circuit board 1190. For example, the first surface of the circuit board 1190 may be the surface facing the first side 1011A (or first side surface or first outer surface) of the bobbin 1110.

[0446] For example, the coil 1120 may be embodied in the form of a coil ring wound clockwise or counterclockwise around an axis perpendicular to the optical axis.

[0447] The coil 1120 may be electrically connected to the circuit board 1190. For example, the coil 1120 may be electrically connected to a pad on the circuit board 1190 by solder or a conductive adhesive.

[0448] The circuit board 1190 and the position sensor 1170 may be disposed on the first side 1012A (or the first side surface or the first outer surface) of the housing 1140. For example, at least a portion of the circuit board 1190 may be disposed on a second seat 1142 formed on the first side 1012A of the housing 1140.

[0449] For example, at least a portion of the first surface of the circuit board 1190 can contact the bottom surface of the second seat 1142 of the housing 1140 .

[0450] The circuit board 1190 may include a plurality of terminals 1009-1 to 1009-n (n is a natural number greater than 1) for electrically connecting to an external device or equipment. For example, the plurality of terminals 1009-1 to 1009-n may be disposed on a second surface of the circuit board 1190. The second surface of the circuit board 1190 may be the surface opposite to the first surface of the circuit board 1190.

[0451] For example, the circuit board 1190 can be a printed circuit board or FPCB.

[0452] For example, the plurality of terminals 1009-1 to 1009-n may be arranged in a line on the lower end of the second surface of the circuit board 1190, but is not limited thereto.

[0453] In the embodiment shown in FIG. 17, the circuit board 1190 includes six terminals 1009-1 to 1009-n (n=6), but the number of terminals is not limited to this.

[0454] The circuit board 1190 is a position sensor 1170 and the terminals 1009-1 to 1009-n may include a circuit pattern or wiring for electrically connecting them.

[0455] The position sensor 1170 may be mounted or disposed on a first surface of the circuit board 1190 and may be electrically connected to the circuit board 1190 .

[0456] For example, the position sensor 1170 may be disposed inside a circuit board 1190 disposed on the first side 1012A of the housing 1140. Here, the inside of the circuit board 1190 may be the center side of the housing 1140 based on the circuit board 1190.

[0457] For example, the position sensor 1170 can be disposed within the central hole 1120A of the coil 1120 disposed on the circuit board 1190. The position sensor 1170 does not have to overlap with the coil 1120 in a direction perpendicular to the optical axis direction. For example, the position sensor 1170 can be disposed within the hole 1106 of the housing 1140. In other embodiments, the position sensor 1170 can be located outside the central hole 1120A of the coil 1120.

[0458] Additionally, the position sensor 1170 may face or overlap the yoke 1136 in a direction perpendicular to the optical axis direction. In other embodiments, the position sensor 1170 may not face or overlap the yoke 1136 in a direction perpendicular to the optical axis direction.

[0459] The position sensor 1170 may sense the strength of the magnetic field of the first magnet 1132 attached to the bobbin 1110 as the bobbin 1110 moves, and may output an output signal (e.g., an output voltage) according to the sensed result. For example, the control unit of the camera module 200-3 or the control unit 780 of the terminal 200A may sense or detect the displacement of the bobbin 1110 in the optical axis direction using the output signal of the position sensor 1170.

[0460] The position sensor 1170 may be implemented as a Hall sensor alone or as a driver including a Hall sensor. The driver-type position sensor may also include a temperature sensing element.

[0461] For example, when the position sensor 1170 is implemented solely as a Hall sensor, the position sensor 1170 may include two input terminals to which a driving signal or power supply is provided and two output terminals for outputting a sensing voltage (or output voltage).

[0462] The circuit board 1190 may include first and second terminals (e.g., 1009-1 and 1009-2) electrically connected to the two input terminals of the position sensor 1170 and providing power or drive signals to the two input terminals. The circuit board 1190 may also include third and fourth terminals (e.g., 1009-3 and 1009-4) electrically connected to the two output terminals of the position sensor 1170 and receiving output signals from the position sensor 1170. The circuit board 1190 may also include fifth and sixth terminals (e.g., 1009-5 and 1009-6) electrically connected to the coil 1120 and providing drive signals to the coil 1120.

[0463] For example, when the position sensor 1170 has the form of a driver including a Hall sensor, the position sensor 1170 may include first to fourth terminals for transmitting and receiving data to and from the outside using data communication using a protocol, for example, I2C communication, and fifth and sixth terminals for providing a drive signal to the coil 1120. Here, the first and second terminals of the position sensor 1170 may be terminals for receiving a power signal, and the third and fourth terminals of the position sensor 1170 may be terminals for transmitting and receiving a clock signal and a data signal. Terminals It can be said that:

[0464] Here, the circuit board 1190 may include first to fourth terminals (e.g., 1009-1 to 1009-4) electrically connected to the first to fourth terminals of the position sensor 1170. In addition, the fifth and sixth terminals of the position sensor 1170 may be electrically connected to the coil 1120 via the circuit board 1190, and a driving signal may be supplied to the coil 1120 via the fifth and sixth terminals of the position sensor 1170.

[0465] The yoke 1136 is disposed in the housing 1140 to correspond to or face the second magnet 1134. For example, the yoke 1136 may be disposed to face the second magnet 1134 in a direction perpendicular to the optical axis direction.

[0466] The yoke 1136 may be disposed on other sides of the housing 1140, except for the first side 1012A of the housing 1140 on which the coil 1120 is disposed. For example, the yoke 1136 may be located opposite the coil 1120. For example, the yoke 1136 may be disposed on the second side 1012B of the housing 1140. For example, the second magnet 1134 may be disposed between the second side 1011B of the bobbin 1110 and the yoke 1136. Or, for example, the second magnet 1134 may be disposed between the first magnet 1132 and the yoke 1136.

[0467] The yoke 1136 may be spaced apart from the circuit board 1190. For example, the circuit board 1190 may be disposed on the first side 1012A of the housing 1140, and the first magnet 1132 may be disposed between the circuit board 1190 and the yoke 1136.

[0468] For example, an attractive force may act in a direction perpendicular to the optical axis between the yoke 1136 and the second magnet 1134. A magnetic circuit may be formed between the yoke 1136 and the second magnet 1134.

[0469] The yoke 1136 can be made of a material that is attracted to a magnet. For example, the yoke 1136 can be made of a magnetic material. For example, the yoke 1136 can be made of a metal material that is attracted to a magnet. Or, for example, the yoke 1136 can be made of a metal material that has magnetic properties.

[0470] Alternatively, for example, the yoke 1136 may be made of a magnet. Here, the yoke 1136 may alternatively be expressed as a "third magnet."

[0471] Since the yoke 1136 is disposed in the housing 1140 which is a fixed part, the bobbin 1110 coupled to the second magnet 1134 can be pulled in the direction of the yoke 1136 by the attractive force acting between the yoke 1136 and the second magnet 1134 .

[0472] The yoke 1136 and the second magnet 1134 can be referred to as a "pressing unit" or a "pressing member" because the ball member 1310 is pressed by the bobbin 1110 and the housing 1140 due to the interaction between the yoke 1136 and the second magnet 1134. When the bobbin 1110 moves in the optical axis direction due to the pressing unit, contact can be maintained between the bobbin 1110 and the ball member 1310 and between the housing 1140 and the ball member 1310.

[0473] The ball member 1310 may be disposed between the bobbin 1110 and the housing 1140. The ball member 1310 may alternatively be referred to as a "rolling member," a "ball," or a "ball bearing."

[0474] The ball member 1310 can contact the bobbin 1110 and the housing 1140, and can support movement of the bobbin 1110 in the optical axis direction by rolling between the bobbin 1110 and the housing 1140. When the bobbin 1110 moves in the optical axis direction, the ball member 1310 can reduce friction between the bobbin 1110 and the housing 1140. By rolling the ball member 1310, the bobbin 1110 can move in a sliding manner in the optical axis direction while remaining in contact with the ball member 1310.

[0475] For example, the ball member 1310 may be made of a metal material, a plastic material, or a resin material, but is not limited thereto.

[0476] The ball member 1310 may have a circular shape and may have a diameter of sufficient size to support movement of the bobbin 1110 along the optical axis.

[0477] For example, the ball member 1310 may be disposed between the second side 1011B (or second side surface or second outer surface) of the bobbin 1110 and the second side 1012B of the housing 1140. For example, the ball member 1310 may be disposed opposite the first magnet 1132.

[0478] For example, at least a portion of the ball member 1310 can be disposed within the groove 1117 of the bobbin 1110. For example, the ball member 1310 can be disposed between the groove 1117 of the bobbin 1110 and the inner surface of the housing 1140 and can contact the groove 1117 of the bobbin 1110 and the inner surface of the housing 1140.

[0479] Also, the ball member 1310 may include at least one ball member. For example, the ball member 1310 may include two or more ball members. 1310A, 1310B may include:

[0480] For example, the ball member 1310 may include a first ball member 1310A positioned between the first groove 1117A of the bobbin 1110 and the second side 1012B of the housing 1140, and a second ball member 1310B positioned between the second groove 1117B of the bobbin 1110 and the second side 1012B of the housing 1140.

[0481] For example, a ball member 1310A, 1310B Each of the balls B1 to B3 and B4 to B6 can include a plurality of balls.

[0482] For example, at least a portion of the ball member 1310 can be disposed within the first groove 1117A of the bobbin 1110, and the first groove 1117A Also, at least another portion of ball member 1310 can contact the inner surface of second side 1012B of housing 1140.

[0483] FIG. 20b can be a variation of FIG. 20a. Referring to FIG. 20 b , the housing 1140 can include a groove 1116 that corresponds to or faces the groove 1117 of the bobbin 1110 .

[0484] For example, the groove 1116 may be formed on the second side 1012B of the housing 1140. For example, the groove 1116 may be formed on the inner surface of the second side 1012B of the housing 1140. The description of the shape of the groove 1117 of the bobbin 1110 may also apply or be applied by analogy to the groove 1116 of the housing 1140.

[0485] For example, groove 1116 is a first groove that corresponds to or faces first groove 1117A of bobbin 1110. 1116A , and a second groove corresponding to or facing the second groove 1117B of the bobbin 1110 1116Bmay include:

[0486] At least a portion of the ball member 1310 can be disposed within the groove 1117 of the bobbin 1110 and can be in contact with the groove 1117 of the bobbin 1110. For example, there can be one or more points of contact between at least a portion of the ball member 1310 and the groove 1117 of the bobbin 1110.

[0487] At least another portion of the ball member 1310 can be disposed within the groove 1116 of the housing 1140 and can be in contact with the groove 1116 of the housing 1140. For example, there can be one or more points of contact between the at least another portion of the ball member 1310 and the groove 1116 of the housing 1140.

[0488] Due to the attractive force acting between the yoke 1136 and the second magnet 1134, the ball member 1310 can be pressed by the bobbin 1110 and / or the housing 1140, thereby stably supporting the bobbin 1110.

[0489] 17, the yoke 1136 is disposed on the housing 1140 and the second magnet 1134 is disposed on the bobbin 1110, but this is not limiting. In other embodiments, the yoke 1136 may be disposed on the second side 1011B of the bobbin 1110 and the second magnet 1134 may be disposed on the second side 1012B of the housing 1140.

[0490] The cover member 1300 can accommodate the housing 1140 .

[0491] The cover member 1300 may have a box shape that is open at the bottom and includes an upper plate 1301 and side plates 1302, and the side plates 1302 of the cover member 1300 may extend downward from the upper plate 1301 of the cover member 1300. The shape of the upper plate 1301 of the cover member 1300 may be polygonal, for example, rectangular or octagonal, and the cover member 1300 may have an opening in the upper plate to expose the lens or lens module 400 to external light.

[0492] The cover member 1300 may be made of a non-magnetic material such as SUS or plastic to prevent it from sticking to the magnets 1132 and 1134, but it may also be made of a magnetic material to function as a yoke.

[0493] FIG. 21 a is a plan view of one embodiment of a first magnet 1132 , a coil 1120 , a second magnet 1134 , and a yoke 1136 .

[0494] 21a, for example, the vertical length L1 of the first magnet 1132 can be greater than the vertical length L2 of the second magnet 1134. This is because the first magnet 1132 is a driving magnet for AF operation, and increasing the vertical length ensures sufficient electromagnetic force for AF drive.

[0495] In other embodiments, the longitudinal length L1 of the first magnet 1132 can be the same as the longitudinal length L2 of the second magnet 1134. In yet other embodiments, the longitudinal length of the first magnet 1132 can be less than the longitudinal length of the second magnet 1134.

[0496] The length L3 of the yoke 1136 in the longitudinal direction can be greater than the length L2 of the second magnet 1134 in the longitudinal direction.

[0497] For example, the area of ​​the first surface of the yoke 1136 facing the second magnet 1134 can be larger than the area of ​​the first surface of the second magnet 1134 facing the yoke 1136 .

[0498] For example, the longitudinal length L3 of the yoke 1136 can be three times or more the longitudinal length L2 of the second magnet 1134. Alternatively, for example, the longitudinal length L3 of the yoke 1136 can be five times or more and ten times or less the longitudinal length L2 of the second magnet 1134.

[0499] This is because increasing the length of the yoke 1136 allows the yoke 1136 to fully receive the magnetic force of the second magnet 1134, thereby increasing the attractive force between the yoke 1136 and the second magnet 1134.

[0500] For example, the "longitudinal direction" may be a direction perpendicular to the optical axis direction and extending from the third side 1011C to the fourth side 1011D of the bobbin 1110. Alternatively, the "longitudinal direction" may be a direction perpendicular to the optical axis direction and parallel to the first side 1011A or the second side 1011B of the bobbin 1110.

[0501] The horizontal length W1 of the first magnet 1132 may be greater than the horizontal length W2 of the second magnet 1134. This is because the first magnet 1132 is a drive magnet for AF operation, and increasing the horizontal length ensures sufficient electromagnetic force for AF drive. In another embodiment, the horizontal length W1 of the first magnet 1132 may be the same as the horizontal length W2 of the second magnet 1134. In yet another embodiment, the horizontal length W1 of the first magnet 1132 may be less than the horizontal length W2 of the second magnet 1134.

[0502] For example, the "horizontal direction" can be a direction perpendicular to the "vertical direction."

[0503] Alternatively, for example, the "lateral direction" can be a direction perpendicular to the optical axis direction from the first side 1011A to the second side 1011B of the bobbin 1110. Alternatively, the "lateral direction" can be a direction perpendicular to the optical axis direction but parallel to the third side 1011C or the fourth side 1011D of the bobbin 1110.

[0504] For example, the longitudinal length L1 of the first magnet 1132 can be equal to or greater than the longitudinal length L4 of the coil 1120. In other embodiments, the longitudinal length L1 of the first magnet 1132 can be less than the longitudinal length L4 of the coil 1120.

[0505] Also, for example, the lateral length W1 of the first magnet 1132 can be equal to or greater than the lateral length W4 of the coil 1120. In other embodiments, the lateral length W1 of the first magnet 1132 can be less than the lateral length W4 of the coil 1120.

[0506] When the yoke 1136 is a magnet, in order for an attractive force to act between the yoke 1136 and the second magnet 1134, the opposing surfaces of the second magnet 1134 and the yoke 1136 may have opposite polarities.

[0507] 21a, the first surface of the second magnet 1134 and the first surface of the yoke 1136 can face each other, and the polarity of the first surface of the second magnet 1134 can be a south pole, and the polarity of the first surface of the yoke 1136 can be a north pole. Alternatively, for example, the polarity of the first surface of the second magnet 1134 can be a north pole, and the polarity of the first surface of the yoke 1136 can be a south pole.

[0508] Figure 21b is a plan view of another embodiment of a first magnet 1132, a coil 1120, a second magnet 1134, and a yoke 1136. The longitudinal lengths of the second magnet 1134 and the yoke 1136 in Figure 21b are different from those in Figure 21a.

[0509] Referring to FIG. 21b, the longitudinal length L21 of the second magnet 1134 can be smaller than the longitudinal length L31 of the yoke 1136 (L21 <L31)。

[0510] For example, the area of ​​the first surface of the yoke 1136 facing the second magnet 1134 can be smaller than the area of ​​the first surface of the second magnet 1134 facing the yoke 1136 .

[0511] The longitudinal length L21 of the second magnet 1134 can be equal to or less than the longitudinal length L1 of the first magnet 1132. In other embodiments, the longitudinal length L21 of the second magnet 1134 can be greater than the longitudinal length L1 of the first magnet 1132.

[0512] If the yoke 1136 in FIG. 21b is a magnet, the second magnet 1134 and the yoke in FIG. 21b 1136 The description of FIG. 21a can be applied or analogized to the polarity of .

[0513] In order to prevent tilt of the bobbin 1110 during AF drive, the length of the second magnet 1134 in the optical axis direction can be made different from the length of the yoke 1136 in the optical axis direction.

[0514] Also, for example, the entire area of ​​the second magnet 1134 can overlap with the yoke 1136 in the direction perpendicular to the optical axis over the entire range in which the bobbin 1110 moves in the optical axis direction.

[0515] FIG. 22a is a cross-sectional view of the first magnet 1132, the coil 1120, the second magnet 1134, and the yoke 1136 along the optical axis OA according to one embodiment.

[0516] 22a, the length H1 of the first magnet 1132 in the optical axis direction can be made greater than the length H2 of the second magnet 1134 in the optical axis direction. This is because the first magnet 1132 is a driving magnet for AF operation, and by increasing the length in the optical axis direction, sufficient electromagnetic force for AF drive can be ensured.

[0517] In another embodiment, the optical axis length of the first magnet 1132 can be the same as the optical axis length of the second magnet 1134. In yet another embodiment, the optical axis length of the first magnet 1132 can be smaller than the optical axis length of the second magnet 1134.

[0518] At least a portion of the first magnet 1132 can overlap at least a portion of the second magnet 1134 in a direction perpendicular to the optical axis OA. Here, the direction perpendicular to the optical axis OA can be a direction parallel to a line that passes through the optical axis OA and is perpendicular to the optical axis OA.

[0519] The length H3 of the yoke 1136 in the optical axis direction can be made larger than the length H2 of the second magnet 1134 in the optical axis direction (H3>H2).

[0520] For example, the length H3 of the yoke 1136 in the optical axis direction can be 1.5 times or more the length H2 of the second magnet 1134 in the optical axis direction. For example, the length H3 of the yoke 1136 in the optical axis direction can be 2 times or more and 5 times or less the length H2 of the second magnet 1134 in the optical axis direction.

[0521] The reason why H3 is set larger than H2 is to maintain a constant attractive force acting between the second magnet 1134 and the yoke 1136 in the section where the bobbin 1110 moves in the optical axis direction for AF drive.

[0522] The attractive force acting between the second magnet 1134 and the yoke 1136 may be affected by the extent to which the yoke 1136 and the second magnet 1134 overlap each other in a direction perpendicular to the optical axis.

[0523] For example, if the entire area of ​​the second magnet 1134 overlaps with the yoke 1136 in the direction perpendicular to the optical axis over the entire range in which the bobbin 1110 moves in the optical axis direction, the attraction acting between the second magnet 1134 and the yoke 1136 will be Power can be kept constant.

[0524] On the other hand, if at least a portion of the second magnet 1134 does not overlap with the yoke 1136 in a direction perpendicular to the optical axis, the attractive force acting between the second magnet 1134 and the yoke 1136 is reduced, and the bobbin 1110 may not be in close contact with the ball member 1310. As a result, the bobbin 1110 may tilt with respect to the optical axis, making it impossible to perform accurate AF operations.

[0525] Therefore, within the entire movement range of the bobbin 1110 in the optical axis direction, the upper end 1026A (or upper surface or upper portion) of the second magnet 1134 can be located lower than the upper end 1027A (or upper surface or upper portion) of the yoke 1136, and the lower end 1026B (or lower surface or lower portion) of the second magnet 1134 can be located lower than the lower end 1027B (or under Face or under Here, the entire moving section may be the position (or displacement) of the bobbin 1110 from the lowest point of the bobbin 1110 to the highest point of the bobbin 1110.

[0526] In other embodiments, at its highest point, the upper end 1026A (or upper surface or top) of the second magnet 1134 can be flush with the upper end 1027A (or upper surface or top) of the yoke 1136. Also, at its lowest point, the lower end 1026B (or lower surface or bottom) of the second magnet 1134 can be flush with the lower end 1027B (or lower surface or bottom) of the yoke 1136.

[0527] 22a, the lower end 1027B of the yoke 1136 is located above the bottom end 1072 of the bobbin 1110, but is not limited to this. In other embodiments, the lower end 1027B of the yoke 1136 may be located below the bottom end 1072 of the bobbin 1110 or at the same height as the bottom end 1072 of the bobbin 1110. For example, the bottom end 1072 of the bobbin 1110 may be the bottom surface of the bobbin 1110 or the bottom end or bottom surface of a stopper provided on the bottom of the bobbin 1110. For example, the lower end 1027B of the yoke 1136 may protrude downward from the bottom end 1072 of the bobbin 1110.

[0528] FIG. 22b shows the distance between the top end 1026A of the second magnet 1134 and the top end 1027A of the yoke 1136 when the bobbin 1110 of FIG. 22a is at its lowest point.

[0529] Referring to FIG. 22b, at the lowest point, the first distance d1 in the optical axis direction between the upper end 1026A of the second magnet 1134 and the upper end 1027A of the yoke 1136 may be greater than the total stroke distance or movable distance of the bobbin 1110 in the optical axis direction.

[0530] For example, the total stroke distance of the bobbin 1110 may be the distance traveled by the bobbin 1110 from its lowest point to its highest point.

[0531] For example, the lowest point may be the lowest point of the displacement of the bobbin 1110 that moves in the optical axis direction for AF drive. For example, the lowest point may be the displacement or position of the bobbin 1110 when the lower end of the bobbin 1110 or a lower stopper of the bobbin 1110 contacts or hits a fixed portion (e.g., the housing 1140).

[0532] For example, the highest point may be the highest point of the displacement of the bobbin 1110 that moves in the optical axis direction for AF drive. For example, the highest point may be the displacement or position of the bobbin 1110 when the upper end of the bobbin 1110 or an upper stopper of the bobbin 1110 contacts or hits a fixed portion (e.g., the housing 1140 or the cover member 1300).

[0533] For example, the first distance d1 can be 1 to 3 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the first distance d1 can be 1.5 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction.

[0534] In other embodiments, for example, the first distance d1 can be equal to the total stroke distance of the bobbin 1110 in the optical axis direction.

[0535] For example, at the lowest point, the lower end 1026B of the second magnet 1134 and the lower end 1026C of the yoke 1136 1027B The second distance d2 in the optical axis direction between the bobbin 1110 and the bobbin 1110 may be 0 or greater, and may be less than or equal to twice the total stroke distance of the bobbin 1110 in the optical axis direction.

[0536] For example, the second distance d2 can be 1 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction, or, for example, the second distance d2 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 1110 in the optical axis direction.

[0537] FIG. 22c shows the distance between the top end 1026A of the second magnet 1134 and the top end 1027A of the yoke 1136 when the bobbin 1110 of FIG. 22a is at its highest point.

[0538] Referring to FIG. 22c, for example, at the highest point, the third distance d3 in the optical axis direction between the upper end 1026A of the second magnet 1134 and the upper end 1027A of the yoke 1136 can be 0 or greater, and can be 2 times or less than the total stroke distance of the bobbin 1110 in the optical axis direction.

[0539] For example, the third distance d3 can be 1 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the third distance d3 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 1110 in the optical axis direction.

[0540] At the highest point, a fourth distance d4 in the optical axis direction between the lower end 1026B of the second magnet 1134 and the lower end 1027B of the yoke 1136 may be greater than the total stroke distance or movable distance of the bobbin 1110 in the optical axis direction.

[0541] For example, the fourth distance d4 can be 1 to 3 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the fourth distance d4 can be 1.5 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction.

[0542] If the first distance d1 (or the fourth distance d4) is less than one time the total stroke distance, the attractive force between the second magnet 1134 and the yoke 1136 cannot be maintained constant, which may result in poor reliability of the AF drive. If the first distance d1 (or the fourth distance d4) is more than three times the total stroke distance, the size of the yoke 1136 may increase unnecessarily, which may increase the size of the lens drive device and increase overall costs.

[0543] In other embodiments, for example, the fourth distance d4 can be equal to the total stroke distance of the bobbin 1110 in the optical axis direction.

[0544] As described in Figures 22b and 22c, even if the bobbin 1110 moves in the optical axis direction for AF drive, the entire second magnet 1134 overlaps with the yoke 1136 in a direction perpendicular to the optical axis, so the pressing force pressing the first ball member 1310 can be maintained constant, thereby suppressing tilt of the bobbin 1110 and ensuring reliability of AF drive.

[0545] In other embodiments, the area where the second magnet 1134 and the yoke 1136 overlap each other in a direction perpendicular to the optical axis throughout the entire range in which the bobbin 1110 moves in the optical axis direction may be 50% or more of the total volume of the second magnet 1134.

[0546] FIG. 23a is a cross-sectional view of another embodiment of a first magnet 1132, a coil 1120, a second magnet 1134, and a yoke 1136 in the direction of the optical axis OA.

[0547] Referring to FIG. 23a, the length H21 of the second magnet 1134 in the optical axis direction may be greater than the length H1 of the first magnet 1132 in the optical axis direction (H21>H1).

[0548] The length H31 of the yoke 1136 in the optical axis direction is the length of the second magnet 1134 in the optical axis direction. H21 The reason for making H21 larger than H31 is to maintain a constant attractive force acting between the second magnet 1134 and the yoke 1136 in the section where the bobbin 1110 moves in the optical axis direction for AF drive.

[0549] Therefore, within the entire movement range of the bobbin 1110 in the optical axis direction, the upper end 1027A (or upper surface or upper part) of the yoke 1136 can be positioned lower than the upper end 1026A (or upper surface or upper part) of the second magnet 1134, and the lower end 1027B (or lower surface or lower part) of the yoke 1136 can be positioned higher than the lower end 1026B (or upper surface or upper part) of the second magnet 1134.

[0550] In other embodiments, at its highest point, the upper end 1027A (or upper surface or top) of the yoke 1136 can be flush with the upper end 1026A (or upper surface or top) of the second magnet 1134. Also, at its lowest point, the lower end 1027B (or lower surface or bottom) of the yoke 1136 can be flush with the lower end 1026B (or lower surface or bottom) of the second magnet 1134.

[0551] FIG. 23b shows the distance between the top end 1026A of the second magnet 1134 and the top end 1027A of the yoke 1136 when the bobbin 1110 of FIG. 23a is at its lowest point.

[0552] Referring to FIG. 23b, at the lowest point, the first distance d11 in the optical axis direction between the upper end 1026A of the second magnet 1134 and the upper end 1027A of the yoke 1136 can be 0 or greater, and can be 2 times the total stroke distance of the bobbin 1110 in the optical axis direction or less.

[0553] For example, the first distance d11 can be 1 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the first distance d11 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 1110 in the optical axis direction.

[0554] At the lowest point, a second distance d12 in the optical axis direction between the lower end 1026B of the second magnet 1134 and the lower end 1027B of the yoke 1136 may be greater than the total stroke distance or movable distance of the bobbin 1110 in the optical axis direction.

[0555] For example, the second distance d12 can be 1 to 3 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the second distance d12 can be 1.5 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction.

[0556] In other embodiments, for example, the second distance d12 can be equal to the total stroke distance of the bobbin 1110 in the optical axis direction.

[0557] FIG. 23c shows the distance between the top end 1026A of the second magnet 1134 and the top end 1027A of the yoke 1136 when the bobbin 1110 of FIG. 23a is at its highest point.

[0558] Referring to FIG. 23c, at the highest point, the third distance d13 in the optical axis direction between the upper end 1026A of the second magnet 1134 and the upper end 1027A of the yoke 1136 may be greater than the stroke range or movable distance of the bobbin 1110 in the optical axis direction.

[0559] For example, the third distance d13 can be 1 to 3 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the third distance d13 can be 1.5 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction.

[0560] In other embodiments, for example, the third distance d13 can be equal to the total stroke distance of the bobbin 1110 in the optical axis direction.

[0561] For example, at the highest point, the fourth distance d14 in the optical axis direction between the lower end 1026B of the second magnet 1134 and the lower end 27A of the yoke 1136 can be 0 or greater, and can be 2 times the total stroke distance of the bobbin 1110 in the optical axis direction or less.

[0562] For example, the fourth distance d14 can be 1 to 2 times the total stroke distance of the bobbin 1110 in the optical axis direction. Alternatively, for example, the fourth distance d14 can be 0 or greater, and can be 1.5 times or less the total stroke distance of the bobbin 1110 in the optical axis direction.

[0563] If the second distance d12 (or the third distance d13) is less than one time the total stroke distance, the attractive force between the second magnet 1134 and the yoke 1136 cannot be maintained constant, which may result in poor reliability of the AF drive. If the second distance d12 (or the third distance d13) is more than three times the total stroke distance, the size of the second magnet 1134 may increase unnecessarily, which may increase the size of the lens drive device and increase various costs.

[0564] As explained in FIGS. 23b and 23c, even if the bobbin 1110 moves along the optical axis for AF drive, the yoke moves in the direction perpendicular to the optical axis. 1132 Since the entirety overlaps with the second magnet 1134, the pressing force pressing the first ball member 1310 can be maintained constant, thereby suppressing tilt of the bobbin 1110 and ensuring reliability of the AF drive.

[0565] Figure 24a is a plan view of a lens driving device according to another embodiment, and Figure 24b is a perspective view of a housing 1140, a ball member 1320, and a yoke 1136 of Figure 24a. The embodiment of Figures 24a and 24b can be a variation of the embodiment of Figures 19 and 20a.

[0566] The lens driving device according to the embodiment of FIGS. 24a and 24b may further include a ball member 1320 in addition to the embodiment of FIGS. 16 and 20a.

[0567] The ball member 1320 can be disposed between the first side 1011A of the bobbin 1110 and the first side 1012A of the housing 1140. For example, the housing 1140 can include at least one groove 1118A, 1118B for disposing or receiving the ball member 1320.

[0568] For example, the grooves 1118A and 1118B may be formed in the first side 1012A of the housing 1140. The grooves 1118A and 1118B may have a recessed shape from the inner surface of the first side 1012A of the housing 1140.

[0569] For example, the grooves 1118A, 1118B may be formed in the protrusion 1041 (or projection) of the housing 1140. For example, the grooves 1118A, 1118B may be formed in a side surface of the protrusion 1041 of the housing 1140 that faces the first side 1011A (or first side surface or first outer surface) of the bobbin 1110.

[0570] For example, grooves 1118A, 1118B can be located between the coil 1120 and a corner of the housing 1140 adjacent the first side 1012A of the housing 1140.

[0571] For example, the housing 1140 may include a first groove 1118A and a second groove 1118B. For example, the first groove 1118A may be located between the coil 1120 and one corner of the housing 1140 adjacent to the first side 1012A, and the second groove 1118B may be located between the coil 1120 and the other corner of the housing 1140 adjacent to the first side 1012A.

[0572] For example, the first groove 1118A may be formed in the first protrusion 1041A of the housing 1140, and the second groove 1118B may be formed in the second protrusion 1041B of the housing 1140.

[0573] For example, the grooves 1118A and 1118B may have openings that are open at the top surface of the housing 1140. Also, for example, the lower portions of the grooves 1118A and 1118B may be closed rather than open at the bottom surface of the housing 1140. The lower portions of the grooves 1118A and 1118B may have a step in the optical axis direction relative to the bottom surface of the housing 1140. For example, the lower portions of the grooves 1118A and 1118B may be positioned higher than the bottom surface of the housing 1140.

[0574] For example, when viewed from above, the grooves 1118A, 1118B may have a triangular shape, but are not limited to such, and may have a polygonal shape (e.g., square or pentagonal, etc.). For example, the grooves 1118A, 1118B may be "V" or "U" shaped grooves.

[0575] In other embodiments, instead of a groove being formed in the housing 1140, a groove for positioning or accommodating the ball member 1320 may be formed in the first side 1011A (first side surface or first outer surface) of the bobbin 1110.

[0576] The ball member 1320 can be disposed between the grooves 1118A, 1118B of the housing 1140 and the first side 1011A of the bobbin 1110. The ball member 1320 can contact the grooves 1118A, 1118B of the housing 1140 and the first side 1011A of the bobbin 1110.

[0577] At least a portion of the ball member 1320 can be disposed within the grooves 1118A, 1118B of the housing 1140 and can be in contact with the grooves 1118A, 1118B of the housing 1140. There can be one or more points of contact between at least a portion of the ball member 1320 and the grooves 1118A, 1118B of the housing 1140.

[0578] Ball member 1320 can include at least one ball member. For example, ball member 1320 can include two or more ball members 1320A, 1320B. For example, ball member 1320 can include a third ball member 1320A and a fourth ball member 1320B.

[0579] Third ball member 1320A may be disposed or housed in the first groove 1118A of the housing 1140, and the fourth ball member 1320B may be disposed or housed in the second groove 1118B of the housing 1140.

[0580] The description of the shape and material of the ball member 1320 in FIG. 20a can be applied to the ball member 1320 in FIGS. 24a and 24b or can be applied by analogy.

[0581] Compared to the embodiment of FIG. 20a, the embodiments of FIGS. 24a and 24b can further reduce friction between the bobbin 1110 and the housing 1140 by using the ball member 1320, thereby reducing the driving force required for normal AF drive and reducing power consumption.

[0582] As a variation of Figure 24a, the housing 1140 may include the groove 1116 described in Figure 20b, and the bobbin 1110 may include the groove 1119 described in Figure 25b.

[0583] FIG. 25a is a plan view of a lens driving device according to yet another embodiment, and FIG. 26 is a plan view of a first magnet 1132, a coil 1120, a second magnet 1134, and a yoke 1136 of the lens driving device of FIG.

[0584] The lens driving device according to the embodiment shown in Figures 25a and 26 may be a modified example of the lens driving device of Figures 20a and 24a. In the lens driving device of Figures 25a and 26, the ball member 1310 of Figures 20a and 24a may be omitted, and the ball member 1320 may be disposed between the first side 1011A of the bobbin 1110 and the first side 1012A of the housing 1140, and a repulsive force may act between the second magnet 1134 and the yoke 1136.

[0585] For example, the bobbin 1110 (and / or the housing 1140) can press the ball member 1320 due to the repulsive force acting between the second magnet 1134 and the yoke 1136, and the ball member 1320 can stably support the bobbin 1110.

[0586] The yoke 1136 can push the second magnet 1134 in a direction toward the ball member 1320. The yoke 1136 can also push the bobbin 1110 in a direction toward the ball member 1320. Therefore, the bobbin 1110 can be in close contact with the ball member 1320.

[0587] For example, the repulsive force between the yoke 1136 and the second magnet 1134 can be 5 gf or less. Alternatively, the repulsive force between the yoke 1136 and the second magnet 1134 can be 1 gf to 3 gf. Alternatively, the repulsive force between the yoke 1136 and the second magnet 1134 can be 0.1 gf to 2 gf.

[0588] The yoke is aligned perpendicular to the optical axis OA and parallel to the line passing through the center of the bobbin 1110. 1136 can overlap with the first magnet 1132. For example, when the first magnet 1132 is a bipolar magnetized magnet, the yoke is oriented in a direction perpendicular to the optical axis OA and parallel to a line passing through the center of the bobbin. 1136 can overlap with the partition wall of the first magnet 1132

[0589] Except for the description of the polarity of the second magnet 1134 and the yoke 1136 on which the attractive force acts, the description of FIGS. 21a to 23c can be applied or analogously applied to the embodiment of FIGS. 25a to 26.

[0590] In Figures 25a and 26, the yoke 1136 can be a "magnet (e.g., a "third magnet")," and in order for a repulsive force to act between the yoke 1136 and the second magnet 1134 in Figure 26, the opposing surfaces of the second magnet 1134 and the yoke 1136 can have the same polarity.

[0591] 26, the first surface of the second magnet 1134 and the first surface of the yoke 1136 can face each other, and the polarity of the first surface of the second magnet 1134 can be a north pole, and the polarity of the first surface of the yoke 1136 can be a north pole. Alternatively, for example, the polarity of the first surface of the second magnet 1134 can be a south pole, and the polarity of the first surface of the yoke 1136 can be a south pole.

[0592] For example, the magnetic force strength of magnetic yoke 1136 can be less than the magnetic force strength of first magnet 1132. Alternatively, in other embodiments, the magnetic force strength of magnetic yoke 1136 can be the same as or greater than the magnetic force strength of first magnet 1132.

[0593] Also, for example, the magnetic force strength of the magnetic yoke 1136 can be greater than the magnetic force strength of the second magnet 1134. Or, in other embodiments, for example, the magnetic force strength of the magnetic yoke 1136 can be the same as the magnetic force strength of the second magnet 1134. In still other embodiments, for example, the magnetic force strength of the magnetic yoke 1136 can be greater than the magnetic force strength of the second magnet 1134.

[0594] The yoke 1136 and the first magnet 1132 may be made of different materials or different components, or in other embodiments, the yoke 1136 and the first magnet 1132 may be made of the same material or components.

[0595] Second Magnet 1132 and the yoke 1136 may be made of the same material or composition. 1132 and yoke 1136 may be formed from different materials or compositions.

[0596] The relationship between the strength of the magnetic force of the first magnet 1132 and the strength of the magnetic force of the second magnet 1134 in the embodiment of FIG. 26 can be applied or can be analogized to that described in the embodiments of FIGS. 20a to 23c.

[0597] In the embodiments of Figures 25a and 26, a repulsive force acts between the first magnet 1132, the separate second magnet 1134, and the yoke 1136, so that the friction force between the bobbin 1110 / housing 1140 and the ball member 1310 can be easily and freely designed or set.

[0598] 25a and 26, regardless of ensuring the electromagnetic force necessary for AF drive, it is possible to easily and freely design or set the frictional force between the bobbin 1110 / housing 1140 and the ball member 1310. Furthermore, since the size of the yoke 1136 is not restricted by the first magnet 1132, the degree of freedom in the size of the yoke 1136 can be improved, thereby improving the degree of freedom in the design of the lens driving device 1100.

[0599] As mobile phones become more functional and have more pixels, the size of image sensors and the diameter of lenses are increasing. In particular, there is a trend toward increasing the diameter of lenses to realize higher pixel counts and improve image quality.

[0600] As the diameter of the lens increases, the weight of the AF moving part increases, so to ensure stable and reliable AF drive, the AF moving part must be stably supported and the tilt of the AF moving part based on the optical axis must be suppressed or the degree of tilt must be alleviated.In a ball-type lens driving device that includes a ball member for supporting the bobbin, to stably support the AF moving part, it is necessary to easily adjust or set the friction force between the bobbin / housing and the ball member according to the weight of the lens.

[0601] FIG. 25b is a variation of FIG. 25a. Referring to FIG. 25 b, the bobbin 1110 can include a groove 1119 that corresponds to or faces the grooves 1118 A, 1118 B of the housing 1140 .

[0602] For example, the groove 1119 may be formed on the first side 1011A of the bobbin 1110. For example, the groove 1119 may be formed on the side or outer surface of the first side 1011A of the bobbin 1110. The description of the shape of the groove 1117 of the bobbin 1110 may be applied to or by analogy with the groove 1119 of the bobbin 1110.

[0603] For example, the groove 1119 can include a first groove 1119A that corresponds or faces the first groove 1118A of the housing 1140 and a second groove 1119B that corresponds or faces the second groove 118B of the housing 1140.

[0604] At least a portion of the ball members 1320A, 1320B can be disposed within the groove 1119 of the bobbin 1110 and can be in contact with the groove 1119 of the bobbin 1110. For example, there can be one or more points of contact between at least a portion of the ball members 1320 and the groove 1119 of the bobbin 1110.

[0605] At least another portion of the ball members 1320A, 1320B can be disposed within the grooves 1118A, 1118B of the housing 1140 and can contact the grooves 1118A, 1118B of the housing 1140. For example, there can be one or more points of contact between at least another portion of the ball members 1320A, 1320B and the grooves 1118A, 1118B of the housing 1140.

[0606] Compared to the comparative example of Figure 13, in this embodiment, an attractive force acts between the first magnet 1132, the separate second magnet 1134, and the yoke 1136, so the friction force between the bobbin 1110 / housing 1140 and the ball member 1310 can be easily and freely designed or set.

[0607] Therefore, in this embodiment, there is an advantage that the frictional force between the bobbin 1110 / housing 1140 and the ball member 1310 can be easily and freely designed or set, regardless of whether the electromagnetic force required for AF drive is ensured.

[0608] Furthermore, since the size of the yoke 1136 is not restricted by the first magnet 1132, the degree of freedom in the size of the yoke 1136 can be improved, and therefore the degree of freedom in the design of the lens driving device 1100 can be improved.

[0609] FIG. 27 is an exploded perspective view of a camera module 200-3 including the lens driving device 1100 of FIG.

[0610] Referring to FIG. 27, the camera module 200-3 may include a lens module 400, a lens driving device 1100, a circuit board 800, and an image sensor 810.

[0611] 27, the camera module 200-3 may further include a "base" disposed between the housing 1140 and the circuit board 800. The camera module 200-3 may also include a filter disposed between the lens module 400 and the image sensor 810. For example, but not limited to, the filter may be disposed or seated on the base. The base may be coupled, attached, or fixed to the upper surface of the circuit board 800 by an adhesive member (not shown).

[0612] The description of the lens module 400, the circuit board 800, the filter, and the image sensor 810 in FIG. 14 may be applied or may be applied by analogy to the embodiment in FIG.

[0613] Figure 28 is a cross-sectional view of a lens driving device 2010 according to yet another embodiment, Figure 29 is a cross-sectional view showing an enlarged view of area A in Figure 28, Figure 30 is a cross-sectional view showing an enlarged view of area B in Figure 28, and Figure 31 is a diagram showing the arrangement of the coils, Hall sensors, and first to third magnets of the lens driving device 2010 of Figure 28.

[0614] The lens driver 2010 may be a voice coil motor (VCM). The lens driver 2010 may be a lens drive motor. The lens driver 2010 may be a lens drive actuator. The lens driver 2010 may include an AF module. The lens driver 2010 may include an OIS module. For example, the lens driver 2010 may be any one of the embodiments 100, 1100, and 2010 in FIGS. 1, 17, and 28.

[0615] The lens driving device 2010 may include a stator 2100. The stator 2100 may be a unit that does not move relative to the mover 2200 during AF driving, or a unit to which the mover 2200 is coupled. The stator 2100 may house the mover 2200 therein.

[0616] The stator 2100 may include a housing 2110. The housing 2110 may be disposed outside the bobbin 2210. The housing 2110 may accommodate at least a portion of the bobbin 2210. The housing 2110 may be disposed within the cover member 2500. The housing 2110 may be disposed between the cover member 2500 and the bobbin 2210. The housing 2110 may be formed from a different material from the cover member 2500. The housing 2110 may be formed from an insulating material. The housing 2110 may be formed from an injection molding. A substrate 2120 may be disposed in the housing 2110. A coil 2130 may be disposed in the housing 2110.

[0617] The housing 2110 may include a protrusion 2111. The protrusion 2111 may protrude inward from the inner surface of the sidewall of the housing 2110. The protrusion 2111 may protrude from the sidewall of the housing 2110 toward the bobbin 2210. The protrusion 2111 may include a plurality of protrusions. The protrusion 2111 may include two protrusions. A driving unit may be disposed between the two protrusions. Here, the driving unit is a part that moves the mover 2200 and may include a coil 2130 and a first magnet 2220. A ball 2300 may be disposed on the protrusion 2111.

[0618] The housing 2110 may include a groove 2112. The groove 2112 may be a "ball-receiving groove." A ball 2300 may be disposed in the groove 2112. The groove 2112 may accommodate at least a portion of the ball 2300. The groove 2112 may be formed on the inner surface of the protrusion 2111. The groove 2112 may be formed so that the spherical ball 2300 contacts the housing 2110 at two points. The groove 2112 may have a V-shape. The groove 2112 may extend in the optical axis direction. The groove 2112 may extend from the upper surface of the housing 2110 to the lower surface of the housing 2110 in the optical axis direction. The groove 2112 may include multiple grooves. The groove 2112 may include two grooves.

[0619] The stator 2100 may include a substrate 2120. The substrate 2120 may be disposed in the housing 2110. The substrate 2120 may include a circuit board. The substrate 2120 may include a flexible printed circuit board (FPCB). A coil 2130 and a Hall sensor 2140 may be disposed on an inner surface of the substrate 2120. The substrate 2120 may be electrically connected to the coil 2130. The substrate 2120 may be electrically connected to the Hall sensor 2140. The substrate 2120 may be electrically connected to the printed circuit board 2050. The substrate 2120 may include a plurality of terminals disposed on a lower end of the substrate 2120, and the plurality of terminals of the substrate 2120 may be soldered to terminals of the printed circuit board 2050 of the camera module of FIG. 33 .

[0620] The stator 2100 may include a coil 2130. The coil 2130 may be an "AF drive coil" used for AF drive. The coil 2130 may be disposed on the substrate 2120. The coil 2130 may be disposed on the housing 2110. The coil 2130 may be disposed between the bobbin 2210 and the housing 2110. The coil 2130 may be disposed on the side of the bobbin 2210 and the cover member 2500. Board and The coil 2130 may be disposed between the bobbin 2210 and the substrate 2120. The coil 2130 may face the first magnet 2220. The coil 2130 may be disposed to face the first magnet 2220. The coil 2130 may electromagnetically interact with the first magnet 2220. In this case, when a current is supplied to the coil 2130 to form an electromagnetic field around the coil 2130, the first magnet 2220 may move relative to the coil 2130 due to the electromagnetic interaction between the coil 2130 and the first magnet 2220. The coil 2130 may be formed of a single coil. Alternatively, the coil 2130 may include multiple coils spaced apart from each other.

[0621] When a forward current is applied to the coil 2130, the mover 2200 can move in a direction away from the image sensor 2060. When a reverse current is applied to the coil 2130, the mover 2200 can move in a direction toward the image sensor 2060.

[0622] The stator 2100 may include a Hall sensor 2140. The Hall sensor 2140 may be disposed on the substrate 2120. The Hall sensor 2140 may be disposed within the coil 2130. The Hall sensor 2140 may include a Hall element (Hall IC). The Hall sensor 2140 may face the first magnet 2220. The Hall sensor 2140 may sense the first magnet 2220. The Hall sensor 2140 may sense the magnetic force of the first magnet 2220. The Hall sensor 2140 may sense a change in the position of the mover 2200. The Hall sensor 2140 may sense a change in the position of the bobbin 2210. The Hall sensor 2140 may be replaced by a driver IC having a built-in Hall element. The driver IC is electrically connected to the coil 2130 and may control the current applied to the coil 2130. The Hall sensor 2140 may be disposed outside the coil 2130.

[0623] The lens driving device 2010 may include a mover 2200. The mover 2200 may be configured to move relative to the stator 2100 during AF driving, or may be a unit to which such a configuration is combined. The mover 2200 may be disposed within the stator 2100. The mover 2200 may be movably disposed within the stator 2100. The mover 2200 may move in the optical axis direction relative to the stator 2100.

[0624] The mover 2200 may include a bobbin 2210. The bobbin 2210 may be disposed in a housing 2110. The bobbin 2210 may be disposed in a hole in the housing 2110. The bobbin 2210 may be movably disposed in the housing 2110. The bobbin 2210 may move within a first stroke in the optical axis direction. The bobbin 2210 may move in the optical axis direction relative to the housing 2110. A lens module 2020 may be coupled to the bobbin 2210. The bobbin 2210 and the lens module 2020 may be coupled by screws and / or adhesive. A first magnet 2220 may be coupled to the bobbin 2210. The bobbin 2210 may be formed by injection molding.

[0625] The bobbin 2210 may include a first groove 2211. The first groove 2211 may be formed on a first surface of the bobbin 2210. The first groove 2211 may be formed by recessing the first surface of the bobbin 2210. The first groove 2211 may be a "first magnet accommodating groove." The first groove 2211 may accommodate a first magnet 2220. The first groove 2211 may be formed to have a size and shape corresponding to the first magnet 2220.

[0626] The bobbin 2210 may include a second groove 2212. The second groove 2212 may be formed on a second surface opposite to the first surface of the bobbin 2210. The second groove 2212 may be formed by recessing the second surface of the bobbin 2210. The second groove 2212 may be a "second magnet accommodating groove." The second groove 2212 may accommodate a second magnet 2410. The second groove 2212 may be formed to have a size and shape corresponding to the second magnet 2410.

[0627] The mover 2200 may include a first magnet 2220. The first magnet 2220 may move the bobbin 2210. The first magnet 2220 may move the bobbin 2210 by interacting with the coil 2130. The first magnet 2220 may move the bobbin 2210 by electromagnetic interaction with the coil 2130. The first magnet 2220 may be disposed on a first surface of the bobbin 2210. The first magnet 2220 may be disposed in a first groove 2211 of the bobbin 2210 so as not to protrude beyond the first surface of the bobbin 2210.

[0628] The first magnet 2220 may include a first surface facing the coil 2130 and a second surface opposite the first surface. The first magnet 2220 may be formed such that an upper portion of the first surface of the first magnet 2220 and a lower portion of the second surface of the first magnet 2220 have the same polarity, and such that a lower portion of the first surface of the first magnet 2220 and an upper portion of the second surface of the first magnet 2220 have the same polarity.

[0629] The first magnet 2220 may include a neutral portion 2221. The neutral portion 2221 may be formed in the center of the first magnet 2220. The neutral portion 2221 may be disposed perpendicular to the optical axis direction. The neutral portion 2221 may include a portion where the polarity is neutral.

[0630] The lens driving device 2010 may include a ball 2300. The ball 2300 may be disposed between the bobbin 2210 and the housing 2110. The ball 2300 may guide the bobbin 2210 to move along the optical axis direction. The ball 2300 may restrict the bobbin 2210 from moving in a direction perpendicular to the optical axis direction. The ball 2300 may be a "guide member." The ball 2300 may be formed in a spherical shape. The ball 2300 may be rotatably disposed between the bobbin 2210 and the housing 2110. The ball 2300 may contact the bobbin 2210 at one point. The ball 2300 may contact the housing 2110 at two points. Meanwhile, the ball 2300 may contact the bobbin 2210 at two points. The ball 2300 may contact the housing 2110 at one point.

[0631] The balls 2300 may include a plurality of balls. The balls 2300 may include two groups of balls. The two groups may be arranged in two grooves 2112, respectively. Each of the two groups of balls may include a plurality of balls. For example, each of the two groups of balls may include two, three, or more balls. Each of the balls in the first group may contact the bobbin 2210 and the housing 2110 at a total of three points. Each of the balls in the second group may contact the bobbin 2210 and the housing 2110 at a total of four points. In other words, the shape of the bobbin 2210 and the housing 2110 that accommodate the balls in the first group may be different from the shape of the bobbin 2210 and the housing 2110 that accommodate the balls in the second group.

[0632] The lens driving device 2010 may include a pressing unit 2400. The pressing unit 2400 may press the mover 2200 against the ball 2300. The pressing unit 2400 may press the ball 2300 against the stator 2100. The pressing unit 2400 may press the bobbin 2210 against the ball 2300. The pressing unit 2400 may press the ball 2300 against the housing 2110. The pressing unit 2400 may cause the ball 2300 to be in close contact with the bobbin 2210 and the housing 2110. This may maintain contact between the bobbin 2210 and the ball 2300 and between the ball 2300 and the housing 2110 even when the bobbin 2210 moves. The pressing unit 2400 may include a magnet. The pressing unit 2400 may include multiple magnets. The pressing unit 2400 may include two magnets. The pressing unit 2400 can use the repulsive force between two magnets.

[0633] The lens driving device 2010 may include a second magnet 2410. The pressing unit 2400 may include a second magnet 2410. The second magnet 2410 may be disposed on a second surface opposite to the first surface of the bobbin 2210. The second magnet 2410 may be disposed in a second groove 2212 of the bobbin 2210 so as not to protrude beyond the second surface of the bobbin 2210. The second magnet 2410 may be disposed between the first magnet 2220 and the third magnet 2420 in a direction perpendicular to the optical axis direction.

[0634] The second magnet 2410 may press the bobbin 2210 into contact with the ball 2300. The second magnet 2410 may press the bobbin 2210 into contact with the ball 2300 through interaction with the third magnet 2420. The second magnet 2410 and the third magnet 2420 may be arranged such that the same polarities face each other. As a result, a repulsive force may be generated between the second magnet 2410 and the third magnet 2420. That is, the second magnet 2410 may press the bobbin 2210 into contact with the ball 2300 due to the repulsive force between the second magnet 2410 and the third magnet 2420. The second magnet 2410 and the third magnet 2420 may be arranged such that a repulsive force acts between them.

[0635] A part of the housing 2110, a part of the bobbin 2210, or a separate member may be disposed between the second magnet 2410 and the third magnet 2420. In this case, a repulsive force may act between the second magnet 2410 and the third magnet 2420.

[0636] The second magnet 2410 may overlap with the neutral portion 2221 of the first magnet 2220 in a second direction perpendicular to the optical axis direction and the first direction. Here, the optical axis direction may correspond to the z-axis direction in Fig. 31, the first direction may correspond to the x-axis direction in Fig. 31, and the second direction may correspond to the y-axis direction in Fig. 31.

[0637] The boundary between the polarities of the second magnet 2410 may be disposed at the same height as the boundary between the polarities of the third magnet 2420 in the optical axis direction. Here, the boundary between the polarities may be a neutral portion. The boundary between the polarities may be formed as an area or a line. The boundary between the polarities of the second magnet 2410 may be disposed at a higher position than the boundary between the polarities of the third magnet 2420 in the optical axis direction. The boundary between the polarities of the second magnet 2410 may be disposed at a lower position than the boundary between the polarities of the third magnet 2420 in the optical axis direction.

[0638] The bobbin 2210 and the second magnet 2410 can move in the optical axis direction within a first stroke S (see FIG. 31). In a direction perpendicular to the optical axis direction, the second magnet 2410 can overlap with the third magnet 2420 over the entire range of the first stroke S. In a direction perpendicular to the optical axis direction, the second magnet 2410 can overlap with the third magnet 2420 by 70% or more of its total volume over the entire range of the first stroke S. In a direction perpendicular to the optical axis direction, the second magnet 2410 can overlap with the third magnet 2420 by 50% or more of its total volume over the entire range of the first stroke S. Here, the direction perpendicular to the optical axis direction may correspond to the y-axis direction in FIG. 31.

[0639] When viewed from above, the second magnet 2410 may be disposed between the first magnet 2220 and the third magnet 2420. The third magnet 2420, the second magnet 2410, and the first magnet 2220 may be sequentially disposed in a second direction perpendicular to the optical axis direction and the first direction. The second direction may be perpendicular to the first surface of the third magnet 2420.

[0640] The second magnet 2410 may be formed from a different material than the first magnet 2220. The second magnet 2410 may include different components than the first magnet 2220. The second magnet 2410 may be formed from a material having a weaker magnetic force than the material of the first magnet 2220. That is, the first magnet 2220 may be formed from a first material, and the second magnet 2410 may be formed from a second material different from the first material. Here, the magnetic force of the first material may be stronger than the magnetic force of the second material. The second magnet 2410 may include at least one material selected from neodymium (NdFeB) and samarium cobalt.

[0641] The second magnet 2410 may include a first surface facing the third magnet 2420. Here, the area of ​​the first surface of the second magnet 2410 may be smaller than the area of ​​the first surface (facing surface) of the third magnet 2420. The volume of the second magnet 2410 may be smaller than the volume of the third magnet 2420. The size of the second magnet 2410 may be smaller than the size of the third magnet 2420.

[0642] The magnetic force of the second magnet 2410 may be weaker than that of the first magnet 2220. The material of the second magnet 2410 may be the same as that of the first magnet 2220. The second magnet 2410 may be made of a material having a weaker magnetic force than the first magnet 2220. The magnetic force of the second magnet 2410 may be the same as or stronger than that of the first magnet 2220.

[0643] The lens driving device 2010 may include a third magnet 2420. The pressing unit 2400 may include a third magnet 2420. The third magnet 2420 may be disposed in the housing 2110. The third magnet 2420 may press the bobbin 2210 into contact with the ball 2300. The third magnet 2420 may press the bobbin 2210 into contact with the ball 2300 by interacting with the second magnet 2410. The third magnet 2420 may be disposed such that the same polarity as that of the second magnet 2410 faces each other. This may generate a repulsive force between the third magnet 2420 and the second magnet 2410. That is, the third magnet 2420 may press the bobbin 2210 into contact with the ball 2300 by the repulsive force between the third magnet 2420 and the second magnet 2410. The third magnet 2420 may press the second magnet 2410 in a direction toward the ball 2300. The third magnet 2420 can push the bobbin 2210 in a direction toward the ball 2300. This allows the bobbin 2210 to be in close contact with the ball 2300. Also, the ball 2300 can be in close contact with the housing 2110. The repulsive force between the second magnet 2410 and the third magnet 2420 can be set to 2 gf or less.

[0644] The magnetic force of the third magnet 2420 may be weaker than that of the first magnet 2220. The material of the third magnet 2420 may be the same as that of the first magnet 2220. The third magnet 2420 may be made of a material having a weaker magnetic force than the first magnet 2220. The magnetic force of the third magnet 2420 may be the same as or stronger than that of the first magnet 2220.

[0645] The third magnet 2420 may include a first surface facing the first surface of the second magnet 2410. The third magnet 2420 may include a first surface facing the first surface of the second magnet 2410. Here, the area of ​​the first surface of the third magnet 2420 may be larger than the area of ​​the first surface (facing surface) of the second magnet 2410. The first surface of the third magnet 2420 and the first surface of the second magnet 2410 may have the same polarity. For example, the first surface of the third magnet 2420 and the first surface of the second magnet 2410 may be north poles. Alternatively, the first surface of the third magnet 2420 and the first surface of the second magnet 2410 may be south poles.

[0646] As shown in FIG. 31, the third magnet 2420 can be longer than the second magnet 2410 in the optical axis direction. The length b (see FIG. 31) of the third magnet 2420 in the optical axis direction can be at least twice the length a (see FIG. 31) of the second magnet 2410. The length b (see FIG. 31) of the third magnet 2420 in the optical axis direction can be at least 1.5 times the length a (see FIG. 31) of the second magnet 2410. The length b (see FIG. 31) of the third magnet 2420 in the optical axis direction can be at least 1.2 times the length a (see FIG. 31) of the second magnet 2410.

[0647] As shown in FIG. 29, the third magnet 2420 may be longer than the second magnet 2410 in a first direction perpendicular to the optical axis direction. The width b (see FIG. 29) of the third magnet 2420 in the first direction may be five times or more the width a (see FIG. 29) of the second magnet 2410. Here, the first direction may correspond to the x-axis direction in FIG. 1. The width of the third magnet 2420 in the first direction perpendicular to the optical axis direction may be greater than the width of the second magnet 2410. The first direction may be the extension direction of the long side of the third magnet 2420. The first direction may be parallel to the first surface of the third magnet 2420. The first direction may be parallel to the first surface of the second magnet 2410. The width b (see FIG. 29) of the third magnet 2420 in the first direction may be two times or more the width a (see FIG. 29) of the second magnet 2410. The width b (see FIG. 29) of the third magnet 2420 in the first direction can be set to 1.5 times or more the width a (see FIG. 29) of the second magnet 2410.

[0648] The thickness of the third magnet 2420 in the second direction perpendicular to the optical axis direction and the first direction may be the same as the thickness of the second magnet 2410. Here, the second direction may correspond to the y-axis direction in FIG. 28. The thickness of the third magnet 2420 in the second direction perpendicular to the optical axis direction and the first direction may be greater than the thickness of the second magnet 2410. The thickness of the third magnet 2420 in the second direction perpendicular to the optical axis direction and the first direction may be less than the thickness of the second magnet 2410.

[0649] The third magnet 2420 may be formed from a different material than the first magnet 2220. The third magnet 2420 may include different components than the first magnet 2220. The third magnet 2420 may be formed from a material having a weaker magnetic force than the material of the first magnet 2220. That is, the first magnet 2220 may be formed from a first material, and the third magnet 2420 may be formed from a second material different from the first material. Here, the magnetic force of the first material may be stronger than the magnetic force of the second material. The third magnet 2420 may include at least one material selected from neodymium (NdFeB) and samarium cobalt.

[0650] The second magnet 2410 and the third magnet 2420 may be made of the same material. Alternatively, the second magnet 2410 and the third magnet 2420 may be made of different materials. The second magnet 2410 and the third magnet 2420 may contain different components.

[0651] Alternatively, the first magnet 2220 and the second magnet 2410 may be made of the same material, and the third magnet 2420 may be made of a different material. Here, the magnetic force of the material of the third magnet 2420 may be weaker than the magnetic force of the material of the first magnet 2220 and the second magnet 2410.

[0652] In another modification, the first magnet 2220 and the third magnet 2420 may be made of the same material, and the second magnet 2410 may be made of a different material. Here, the magnetic force of the material of the second magnet 2410 may be weaker than the magnetic force of the material of the first magnet 2220 and the third magnet 2420.

[0653] The lens driving device 2010 may include a cover member 2500. The cover member 2500 may include a "cover can." The cover member 2500 may be disposed to surround the housing 2110. The cover member 2500 may house the housing 2110 inside. The cover member 2500 may form the exterior of the lens driving device 2010. The cover member 2500 may have a hexahedral shape with an open bottom. The cover member 2500 may be made of a non-magnetic material. The cover member 2500 may be made of metal. The cover member 2500 may be made of a metal plate material. The cover member 2500 may be connected to a ground portion of the printed circuit board 2050. Thus, the cover member 2500 may be grounded. The cover member 2500 may block electromagnetic interference (EMI). Here, the cover member 2500 may be referred to as an "EMI shielding can."

[0654] The cover member 2500 may include an upper plate and side plates. The cover member 2500 may include an upper plate having a hole and side plates extending downward from the outer periphery or edge of the upper plate. The cover member 2500 may include a plurality of side plates. The plurality of side plates may include first to fourth side plates. The side plates of the cover member 2500 may include a first side plate and a second side plate disposed opposite each other, and a third side plate and a fourth side plate disposed opposite each other between the first and second side plates. A substrate 2120 and a coil 2130 may be disposed on the first side plate of the cover member 2500, and a third magnet 2420 may be disposed on the second side plate.

[0655] In this embodiment, a first magnet 2220 for driving may be disposed on one side of the bobbin 2210, and a coil 2130 may be disposed on the stator 2100 facing the first magnet 2220. A Hall element or a driver IC incorporating a Hall element may be disposed inside or outside the coil 2130. The Hall element may be disposed on the substrate 2120.

[0656] By arranging the second magnet 2410 on the opposite side of the first magnet 2220, which is the driving part of the bobbin 2210, and arranging the third magnet 2420 in the housing 2110, which is the stator 2100, the ball 2300 and the housing 2110 can be configured to be in close contact with each other using a pushing force.

[0657] Since the second magnet 2410 is disposed on the mover 2200, the second magnet 2410 may be formed to have a smaller size and shorter height than the third magnet 2420 so that the repulsive force is constant.

[0658] The third magnet 2420 may be configured so that its inner and outer sides have opposite polarities. The second magnet 2410 may be arranged to have a corresponding pushing force. In particular, to maintain a constant repulsive force and minimize dispersion, the second magnet 2410 and the third magnet 2420 may be made of a lower grade magnet than the first magnet 2220 and have better temperature characteristics. For example, the second magnet 2410 and the third magnet 2420 may be made of NdFeB and / or samarium cobalt magnets. Alternatively, to achieve the above-mentioned objectives, the second magnet 2410 and the third magnet 2420 may be made of different types of magnets. Considering the weight of modern lenses and the weight of the actuator, a pushing force of 2 gf or less may be appropriate. To prevent tilt, the centers of the first magnet 2220 and the third magnet 2420 may be positioned within the entire stroke of the actuator, with some overlapping sections in a cross-sectional view (FIG. 4). The third magnet 2420 may be an actuator having a structure in which it overlaps with the second magnet 2410 within the stroke section.

[0659] The embodiment may include a lens driving device 2010 in which the movable element 2200, the ball 2300, and the stator 2100 come into contact with each other and move in a sliding manner using the force of magnets pushing each other in the opposite direction to the driving unit in an actuator in which the ball 2300 and some points come into contact.

[0660] In this embodiment, the magnetic force of the second magnet 2410 and the third magnet 2420 is lower than the magnetic force of the first magnet 2220, and a pushing force may be generated between the second magnet 2410 and the third magnet 2420. The size and height of the second magnet 2410 may be smaller than that of the third magnet 2420.

[0661] A modified lens driving device 2010 will be described below with reference to the drawings.

[0662] FIG. 32 is a diagram showing the arrangement of the coils, hall sensors, and first to third magnets of a lens driving device 2010 according to a modified example.

[0663] The following description will focus on the differences between the modified example and the embodiment, while the description of the embodiment can be applied to parts not described in the modified example by analogy.

[0664] In a modified example, the second magnet 2410a may be larger than the third magnet 2420a. The volume of the second magnet 2410a may be larger than the volume of the third magnet 2420a. The second magnet 2410a may include a first surface, and the third magnet 2420a may include a first surface facing the first surface of the second magnet 2410a. Here, the area of ​​the first surface of the third magnet 2420a may be smaller than the area of ​​the first surface of the second magnet 2410a. The length of the second magnet 2410a in the optical axis direction may be larger than the length of the third magnet 2420a. The length of the second magnet 2410a in a first direction perpendicular to the optical axis direction may be larger than the length of the third magnet 2420a. This structure prevents the bobbin 2210 from tilting even if the second magnet 2410a moves during AF drive.

[0665] FIG. 33 is an exploded perspective view of a camera module according to another embodiment.

[0666] The camera module may be a camera device.

[0667] The camera module may include a lens module 2020. The lens module 2020 may include at least one lens. The lens may be disposed at a position corresponding to the image sensor 2060. The lens module 2020 may include a lens and a barrel. The lens module 2020 may be coupled to a bobbin 2210 of the lens driver 2010. The lens module 2020 may be coupled to the bobbin 2210 by screws and / or adhesive. The lens module 2020 may move together with the bobbin 2210.

[0668] The camera module may include a filter 2030. The filter 2030 may serve to block light of a specific frequency band from passing through the lens module 2020 from also entering the image sensor 2060. The filter 2030 may be arranged parallel to the xy plane. The filter 2030 may be arranged between the lens module 2020 and the image sensor 2060. The filter 2030 may be arranged on the sensor base 2040. The filter 2030 may include an infrared filter. The infrared filter may block light in the infrared region from entering the image sensor 2060. The infrared filter may include an infrared reflective filter or an infrared absorbing filter.

[0669] The camera module may include a sensor base 2040. The sensor base 2040 may be disposed between the lens driver 2010 and the printed circuit board 2050. The sensor base 2040 may include a protrusion 2041 on which the filter 2030 is disposed. An opening may be formed in the portion of the sensor base 2040 on which the filter 2030 is disposed so that light passing through the filter 2030 can be incident on the image sensor 2060. An adhesive member may be disposed between the sensor base 2040 and the lens driver 2010. The adhesive member may adhere the lens driver 2010 to an upper surface of the sensor base 2040. The adhesive member may be configured to prevent foreign matter from entering the inside of the lens driver 2010. The adhesive member may include at least one of epoxy, a heat-curable adhesive, and an ultraviolet-curable adhesive.

[0670] The camera module may include a printed circuit board (PCB) 2050. The printed circuit board 2050 may be a substrate or a circuit board. A lens driving device 2010 may be disposed on the printed circuit board 2050. A sensor base 2040 may be disposed between the printed circuit board 2050 and the lens driving device 2010. The printed circuit board 2050 may be electrically connected to the lens driving device 2010. An image sensor 2060 may be disposed on the printed circuit board 2050. The printed circuit board 2050 may include various circuits, elements, a control unit, etc. to convert an image formed on the image sensor 2060 into an electrical signal and transmit the signal to an external device.

[0671] The camera module may include an image sensor 2060. The image sensor 2060 may be configured to form an image when light passing through the lens and the filter 2030 is incident thereon. The image sensor 2060 may be mounted on the printed circuit board 2050. The image sensor 2060 may be electrically connected to the printed circuit board 2050. For example, the image sensor 2060 may be coupled to the printed circuit board 2050 using surface mounting technology (SMT). For another example, the image sensor 2060 may be coupled to the printed circuit board 2050 using flip chip technology. The image sensor 2060 may be disposed such that its optical axis coincides with that of the lens. That is, the optical axis of the image sensor 2060 may be aligned with that of the lens. The image sensor 2060 may convert light irradiated onto an effective image area of ​​the image sensor 2060 into an electrical signal. The image sensor 2060 may be any one of a charge coupled device (CCD), a metal oxide semi-conductor (MOS), a CPD, and a CID.

[0672] The camera module may include a motion sensor 2070. The motion sensor 2070 may be mounted on the printed circuit board 2050. The motion sensor 2070 may be electrically connected to the control unit 2080 via a circuit pattern provided on the printed circuit board 2050. The motion sensor 2070 may output rotational angular velocity information according to the movement of the camera module. The motion sensor 2070 may include a 2-axis or 3-axis gyro sensor or an angular velocity sensor.

[0673] The camera module may include a control unit 2080. The control unit 2080 may be disposed on the printed circuit board 2050. The control unit 2080 may be electrically connected to the coil 2130 of the lens driving device 2010. The control unit 2080 may individually control the direction, strength, and amplitude of current supplied to the coil 2130. The control unit 2080 may control the lens driving device 2010 to perform an autofocus function. The control unit 2080 may be electrically connected to a Hall sensor 2140. The control unit 2080 may sense the position of the mover 2200 through the Hall sensor 2140 and perform autofocus feedback control on the lens driving device 2010.

[0674] The camera module may include a connector 2090. The connector 2090 may be electrically connected to the printed circuit board 2050. The connector 2090 may include a port for electrically connecting to an external device.

[0675] The explanations of FIGS. 28 to 32 can be applied to the embodiment of FIGS. 17 to 27 or can be applied by analogy.

[0676] FIG. 34 is a perspective view of an optical device 200A according to an embodiment, and FIG. 35 is a configuration diagram of the optical device 200A shown in FIG.

[0677] Referring to Figures 34 and 35, the optical device (hereinafter referred to as the "terminal") 200A may include a body 850, a wireless communication unit 710, an A / V input unit 720, a sensing unit 740, an input / output unit 750, a memory unit 760, an interface unit 770, a control unit 780, and a power supply unit 790.

[0678] The body 850 shown in FIG. 34 has a bar shape, but is not limited to this and may have various structures such as a slide type, folder type, swing type, swivel type, etc., in which two or more sub-bodies are connected to be able to move relative to each other.

[0679] The body 850 may include a case (such as a casing, housing, or cover) that forms the exterior. For example, the body 850 may be divided into a front case 851 and a rear case 852. Various electronic components of the terminal may be housed in a space formed between the front case 851 and the rear case 852.

[0680] The wireless communication unit 710 may include one or more modules that enable wireless communication between the terminal 200A and a wireless communication system or between the terminal 200A and a network in which the terminal 200A is located. For example, the wireless communication unit 710 may include a broadcast receiving module 711, a mobile communication module 712, a wireless Internet module 713, a short-range communication module 714, and a location information module 715.

[0681] The A / V (Audio / Video) input unit 720 is for inputting an audio signal or a video signal, and may include a camera 721, a microphone 722, and the like.

[0682] The camera 721 may include the cameras 200, 200-1 to 200-3 according to the embodiment.

[0683] The sensing unit 740 can sense the current state of the terminal 200A, such as the open / closed state of the terminal 200A, the position of the terminal 200A, whether or not the user is touching the terminal 200A, the orientation of the terminal 200A, and the acceleration / deceleration of the terminal 200A, and can generate a sensing signal for controlling the operation of the terminal 200A. For example, if the terminal 200A is a slide phone, the sensing unit 740 can sense the open / closed state of the slide phone. The sensing unit 740 is also responsible for sensing functions related to the power supply state of the power supply unit 790, the connection state of the interface unit 770 with an external device, etc.

[0684] The input / output unit 750 generates input or output related to vision, hearing, touch, etc. The input / output unit 750 can generate input data for operational control of the terminal 200A and can display information processed by the terminal 200A.

[0685] The input / output unit 750 may include a keypad unit 730, a display module 751, an audio output module 752, and a touch screen panel 753. The keypad unit 730 may generate input data through input from the keypad.

[0686] The display module 751 may include a plurality of pixels that change color in response to an electrical signal. For example, the display module 751 may include at least one of a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, and a 3D display.

[0687] The audio output module 752 can output audio data received from the wireless communication unit 710 in a call signal reception mode, a call mode, a recording mode, a voice recognition mode, or a broadcast reception mode, or can output audio data stored in the memory unit 760.

[0688] The touchscreen panel 753 can convert changes in capacitance caused by a user's touch on a particular area of ​​the touchscreen into electrical input signals.

[0689] The memory unit 760 can store programs for processing and controlling the control unit 780 and temporarily store input and output data (e.g., phonebook, messages, audio, still images, photos, videos, etc.) For example, the memory unit 760 can store images, such as photos or videos, captured by the camera 721.

[0690] The interface unit 770 serves as a passageway for connection with an external device connected to the terminal 200A. The interface unit 770 receives data or power from an external device and transmits it to each component inside the terminal 200A, or transmits data inside the terminal 200A to an external device. For example, the interface unit 770 may include a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I / O (Input / Output) port, a video I / O (Input / Output) port, an earphone port, etc.

[0691] The controller 780 may control the overall operation of the terminal 200 A. For example, the controller 780 may perform related control and processing for voice communication, data communication, video communication, and the like.

[0692] The control unit 780 may include a multimedia module 781 for playing multimedia. The multimedia module 781 may be implemented within the control unit 780 or may be implemented separately from the control unit 780.

[0693] The control unit 780 can perform pattern recognition processing to recognize handwritten or drawn inputs made on the touch screen as characters and images, respectively.

[0694] The power supply unit 790 receives an external power source or an internal power source under the control of the control unit 780, and can supply power necessary for the operation of each component.

[0695] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention. [Industrial Applicability]

[0696] The embodiment can be used in a lens driving device, a camera module, and an optical device that can stably support an AF moving part by easily and freely designing the friction force between the bobbin and the housing and the ball member.

Claims

1. With the base, a housing disposed on the base; a bobbin disposed within the housing; a first magnet disposed on the bobbin; a coil disposed in the housing opposite the first magnet; a second magnet disposed on the bobbin at a distance from the first magnet; a yoke disposed on the housing facing the second magnet; a ball member disposed between one side of the bobbin and one side of the housing, the ball member facing each other in a first direction perpendicular to the optical axis direction; a position sensor disposed on the base facing the first magnet or the second magnet in the optical axis direction, the ball member includes a first ball and a second ball spaced apart in a second direction perpendicular to the optical axis direction and the first direction, The lens driving device, wherein the first ball and the second ball are pressed by the bobbin and the housing due to the interaction between the first magnet and the yoke.

2. the second magnet is disposed between the yoke and the first magnet, The lens driving device according to claim 1 , wherein the first magnet is disposed between the second magnet and the coil.

3. a circuit board disposed in the housing; The lens driving device according to claim 1 , wherein the coil is electrically connected to the circuit board.

4. The lens driving device according to claim 3 , further comprising a current-carrying member electrically connected to the position sensor.

5. 5. The lens driving device according to claim 1, wherein the position sensor does not overlap the first magnet or the second magnet in a direction perpendicular to the optical axis direction.

6. 6. The lens driving device according to claim 1, wherein the position sensor does not overlap with the yoke in a direction perpendicular to the optical axis direction.

7. the first magnet is disposed on a first side of the bobbin and the second magnet is disposed on a second side of the bobbin opposite the first side of the bobbin; 7. The lens driving device according to claim 1, wherein the coil is disposed on a first side of the housing, and the yoke is disposed on a second side of the housing opposite the first side of the housing.

8. the ball member is disposed between a side of the bobbin on which the second magnet is disposed and a side of the housing on which the yoke is disposed, 8. The lens driving device according to claim 1, wherein an attractive force acts between the yoke and the second magnet.

9. the ball member is disposed between a side of the bobbin on which the first magnet is disposed and a side of the housing on which the coil is disposed, 8. The lens driving device according to claim 1, wherein a repulsive force acts between the yoke and the second magnet.

10. the yoke is a magnetic material, 10. The lens driving device according to claim 1, wherein a length of the yoke in the optical axis direction is different from a length of the second magnet in the optical axis direction.

11. 11. The lens driving device according to claim 1, wherein a drive signal is supplied to the coil, and the bobbin moves in the optical axis direction due to an interaction between the first magnet and the coil.

12. 5. The lens driving device according to claim 4, wherein the current-carrying member is disposed on the base and includes at least one terminal for electrically connecting the position sensor and the circuit board.

13. the current-carrying member includes a circuit member disposed on the base; The lens driving device according to claim 4 , wherein the circuit member includes at least one terminal electrically connected to the position sensor.

14. the length of the yoke in the optical axis direction is greater than the length of the second magnet in the optical axis direction; A lens driving device described in any one of claims 1 to 13, wherein when the bobbin is positioned at its lowest point in the optical axis direction, the distance between the upper end of the second magnet and the upper end of the yoke in the optical axis direction is between 1 and 3 times the total stroke distance of the bobbin in the optical axis direction.

15. 15. The lens driving device of claim 14, wherein at the lowest point, the distance between the lower end of the second magnet and the lower end of the yoke in the optical axis direction is 0 or greater and is equal to or less than twice the total stroke distance of the bobbin in the optical axis direction.

16. a length of the second magnet in the optical axis direction is greater than a length of the yoke in the optical axis direction; A lens driving device described in any one of claims 1 to 15, wherein when the bobbin is positioned at its lowest point in the optical axis direction, the distance between the lower end of the second magnet and the lower end of the yoke in the optical axis direction is greater than or equal to 1 time and less than or equal to 3 times the total stroke distance of the bobbin in the optical axis direction.

17. At said lowest point, 17. The lens driving device of claim 16, wherein the distance between the upper end of the second magnet and the upper end of the yoke in the optical axis direction is 0 or greater and is equal to or less than twice the total stroke distance of the bobbin in the optical axis direction.

18. Housing and a bobbin disposed within the housing; a first magnet disposed on the bobbin; a coil disposed in the housing opposite the first magnet; a second magnet disposed on the bobbin at a distance from the first magnet; a yoke disposed on the housing facing the second magnet; a ball member disposed between the housing and a side of the bobbin facing each other in a first direction perpendicular to the optical axis direction; a first circuit board disposed below the housing; an image sensor disposed on the first circuit board; a position sensor disposed on the first circuit board facing the first magnet or the second magnet in the optical axis direction, the ball member includes a first ball and a second ball spaced apart in a second direction perpendicular to the optical axis direction and the first direction, The camera device, wherein the first ball and the second ball are pressed by the bobbin and the housing due to the interaction between the first magnet and the yoke.

19. the second magnet is disposed between the yoke and the first magnet, The camera device of claim 18 , wherein the first magnet is disposed between the second magnet and the coil.

20. Housing and a bobbin disposed within the housing; a first magnet and a second magnet disposed on the bobbin; a coil disposed in the housing opposite the first magnet; a yoke disposed on the housing facing the second magnet; a ball member disposed between a side portion of the bobbin and a side portion of the housing that face each other in a first direction perpendicular to the optical axis direction; the second magnet is disposed between the yoke and the first magnet, the ball member includes a first ball and a second ball spaced apart in a second direction perpendicular to the optical axis direction and the first direction, The lens driving device, wherein the first ball and the second ball are pressed by the bobbin and the housing due to the interaction between the first magnet and the yoke.

Images