Lens drive device, camera module and optical device

Abstract

This embodiment includes a fixed portion, a moving portion disposed within the fixed portion, a drive magnet disposed on the moving portion, a coil disposed on the fixed portion so as to correspond to the drive magnet, and a ball disposed between the fixed portion and the moving portion, the ball guiding the moving portion to move in the optical axis direction relative to the fixed portion, the fixed portion including first and second side plates disposed on opposite sides to each other, and third and fourth side plates connecting the first and second side plates and disposed on opposite sides to each other, and the moving portion connecting first and second side surfaces disposed on opposite sides to each other. and a third side surface and a fourth side surface arranged on opposite sides to each other, the first to fourth side plates face the first to fourth side surfaces, the drive magnet moves the moving section in the optical axis direction through interaction with the coil, the drive magnet includes a first drive magnet arranged on the first side surface of the moving section and a second drive magnet arranged on the third side surface of the moving section, and the balls include a first ball arranged in a first corner region where the first side plate and the fourth side plate of the fixed section are connected, and a second ball arranged in a second corner region where the second side plate and the third side plate of the fixed section are connected.

Description

[Technical Field]

[0001] This embodiment relates to a lens driving device. [Background technology]

[0002] A camera device is a device that takes photographs or videos of a subject, and is attached to optical devices such as smartphones, drones, vehicles, etc.

[0003] Camera devices are required to have an autofocus (AF) function that automatically adjusts the focus according to the distance between the camera and the subject, and an optical image stabilization (OIS) function that corrects image shake caused by user movement to improve image quality.

[0004] Recently, as the number of pixels in image sensors increases, the diameter of lenses has become larger, and as a result, the driving force required to move the lenses to perform autofocus and image stabilization functions has increased. Summary of the Invention [Problem to be solved by the invention]

[0005] This embodiment aims to provide a lens driving device that provides increased driving force within a limited size. [Means for solving the problem]

[0006] The lens driving device according to the present embodiment includes a fixed portion, a moving portion disposed within the fixed portion, a drive magnet disposed on the moving portion, a coil disposed on the fixed portion so as to correspond to the drive magnet, and a ball disposed between the fixed portion and the moving portion, the ball guiding the moving portion to move in the optical axis direction relative to the fixed portion, the fixed portion including first and second side plates disposed on opposite sides to each other, and third and fourth side plates connecting the first and second side plates and disposed on opposite sides to each other, the moving portion including first and second side surfaces disposed on opposite sides to each other, and a coil disposed on the first and second side surfaces The fixed portion includes a third side surface and a fourth side surface that are arranged opposite each other and connect the sides of the fixed portion, the first to fourth side plates face the first to fourth side surfaces, the drive magnet moves the moving portion in the optical axis direction through interaction with the coil, the drive magnet includes a first drive magnet arranged on the first side surface of the moving portion and a second drive magnet arranged on the third side surface of the moving portion, and the balls include a first ball arranged in a first corner region where the first side plate and the fourth side plate of the fixed portion are connected, and a second ball arranged in a second corner region where the second side plate and the third side plate of the fixed portion are connected.

[0007] The first side plate includes a first protrusion protruding from an inner surface of the first side plate, the first protrusion including a groove, and the first ball disposed in the groove of the first side plate.

[0008] The third side plate includes a second protruding portion protruding from an inner surface of the third side plate, the second protruding portion including a groove, and the second ball is disposed in the groove of the third side plate.

[0009] The first side includes a first groove formed from the surface of the first side toward the inside of the moving portion, and the third side includes a second groove formed from the surface of the third side toward the inside of the moving portion.

[0010] the first protrusion of the first side plate is disposed in the first groove of the first side surface,

[0011] The second protrusion of the third side plate is disposed in the second groove of the third side surface.

[0012] The first ball contacts the first protrusion of the first side plate and the first groove of the first side surface, and the second ball contacts the second protrusion of the third side plate and the second groove of the third side surface.

[0013] The optical axis direction includes a first yoke arranged outside the fixed portion and overlapping with the first side plate in a direction perpendicular to the optical axis direction, and a second yoke arranged outside the fixed portion and overlapping with the third side plate in a direction perpendicular to the optical axis direction.

[0014] The first balls include a plurality of first balls, the second balls include a plurality of second balls, the plurality of first balls are arranged in the optical axis direction, and the plurality of second balls are arranged in the optical axis direction.

[0015] A lens driving device according to a first embodiment includes a fixed portion, a moving portion disposed within the fixed portion, a drive magnet disposed on the moving portion, a coil disposed on the fixed portion so as to correspond to the drive magnet, and a ball disposed between the fixed portion and the moving portion, the ball guiding the moving portion to move in the optical axis direction relative to the fixed portion, the fixed portion including first and second side plates disposed on opposite sides to each other, and third and fourth side plates connecting the first and second side plates and disposed in opposite directions to each other, the moving portion including first and second side plates disposed on opposite sides to each other, and a coil disposed on the first side and front The fixed portion includes a third side and a fourth side that are connected to the second side and arranged in opposite directions from each other, the first to fourth side plates face the first to fourth side plates, the drive magnet moves the moving portion in the optical axis direction through interaction with the coil, the drive magnet includes a first drive magnet arranged on the first side of the moving portion and a second drive magnet arranged on the second side of the moving portion, and the balls include a first ball arranged in a first corner region where the first side plate and the third side plate of the fixed portion are connected, and a second ball arranged in a second corner region where the second side plate and the fourth side plate of the fixed portion are connected.

[0016] The first side plate includes a protrusion that protrudes from an inner surface of the first side plate, and the second side plate includes a protrusion that protrudes from an inner surface of the second side plate.

[0017] The protrusion of the first side plate and the protrusion of the second side plate are rotationally symmetrical about the optical axis.

[0018] The protrusion of the first side plate includes a groove, and the first ball is disposed in the groove of the protrusion of the first side plate.

[0019] The first side includes a groove recessed from an outer surface of the first side toward the inside of the moving portion, and the second side includes a groove recessed from an outer surface of the second side toward the inside of the moving portion.

[0020] The protrusion of the first side plate is disposed in the groove of the first side surface, and the protrusion of the second side plate is disposed in the groove of the second side surface.

[0021] The optical axis direction includes a first yoke arranged outside the fixed portion and overlapping with the first side plate in a direction perpendicular to the optical axis direction, and a second yoke arranged outside the fixed portion and overlapping with the second side plate in a direction perpendicular to the optical axis direction.

[0022] The center of the first yoke overlaps with the first region of the moving portion in a direction perpendicular to the optical axis direction, and the center of the second yoke overlaps with the second region of the moving portion in a direction perpendicular to the optical axis direction.

[0023] A lens driving device according to a second embodiment includes a fixed portion, a moving portion disposed within the fixed portion, a drive magnet disposed on the moving portion, a coil disposed on the fixed portion so as to correspond to the drive magnet, and a ball disposed between the fixed portion and the moving portion, the ball guiding the moving portion to move in the optical axis direction relative to the fixed portion, the fixed portion including first and second side plates disposed on opposite sides to each other, and third and fourth side plates connecting the first and second side plates and disposed in opposite directions to each other, and the moving portion including first and second side plates disposed on opposite sides to each other. , and includes a third side and a fourth side that connect the first side and the second side and are arranged in opposite directions from each other, the first to fourth side plates face the first to fourth side plates, the drive magnet moves the moving part in the optical axis direction through interaction with the coil, the drive magnet includes a first drive magnet arranged on the first side of the moving part and a third drive magnet arranged on the third side of the moving part, and the balls include a first ball and a second ball that are arranged in a corner region between the first side plate and the third side plate, and the first ball and the second ball are arranged spaced apart from each other.

[0024] The camera device includes a printed circuit board, an image sensor disposed on the printed circuit board, and

[0025] a lens driving device disposed on the printed circuit board, and a lens disposed on the lens driving device.

[0026] The optical device includes a main body, a display unit disposed on the main body for displaying information, and a camera module disposed on the main body for taking at least one of an image and a photograph. [Effects of the Invention]

[0027] In this embodiment, the driving magnet and coil for driving the AF are arranged in both directions, which has the effect of increasing the AF driving force. Also, in this embodiment, the driving magnet and coil for driving the AF are arranged in a plurality of directions, which has the effect of increasing the AF driving force. In other words, when the camera height is the same, a higher AF driving force can be ensured compared to a structure in which the driving magnet and coil for driving the AF are arranged in one direction. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view of a lens driving device according to an embodiment of the present invention.

[0029] [Figure 2] FIG. 2 is a plan view of the lens driving device according to the embodiment.

[0030] [Figure 3] FIG. 2 is an exploded perspective view of the lens driving device according to the embodiment.

[0031] [Figure 4] FIG. 2 is a perspective view of a fixing portion of the lens driving device according to the embodiment.

[0032] [Figure 5] FIG. 2 is a plan view of a fixing portion of the lens driving device according to the embodiment.

[0033] [Figure 6]FIG. 2 is a perspective view of a moving portion of the lens driving device according to the embodiment.

[0034] [Figure 7] FIG. 2 is a plan view of a moving portion of the lens driving device according to the embodiment.

[0035] [Figure 8] FIG. 10 is an exploded perspective view of a lens driving device according to a first modified example.

[0036] [Figure 9] FIG. 10 is a plan view of a lens driving device according to a first modified example.

[0037] [Figure 10] FIG. 10 is a perspective view of a fixing portion in a lens driving device according to a first modified example.

[0038] [Figure 11] FIG. 10 is a plan view of a fixing portion in a lens driving device according to a first modified example.

[0039] [Figure 12] FIG. 10 is a perspective view of a moving portion in a lens driving device according to a first modified example.

[0040] [Figure 13] FIG. 10 is a plan view of a moving section in a lens driving device according to a first modified example.

[0041] [Figure 14] 10 is a diagram showing that a moving part is tilted at a fixed part in a lens driving device according to a first modified example. FIG.

[0042] [Figure 15] FIG. 10 is a plan view of a lens driving device according to a second modified example.

[0043] [Figure 16]16 is a cross-sectional view illustrating the state of the moving part in the initial state where no current is applied to the first coil and the second coil, showing the autofocus driving of the lens driving device according to the embodiment. [Figure 17] 17 is a cross-sectional view illustrating a state in which a forward current is applied to the first coil and the second coil, and the moving part moves upward in the optical axis direction, as a result of which the forward current is applied to the first coil and the second coil. [Figure 18] 18 is a diagram for explaining autofocus driving of the lens driving device according to the present embodiment. Fig. 18 is a cross-sectional view showing a state in which a reverse current is applied to the first coil and the second coil, and the moving part moves downward in the optical axis direction with respect to the position of the moving part in Fig. 17.

[0044] [Figure 19] FIG. 2 is an exploded perspective view of the camera device according to the embodiment.

[0045] [Figure 20] FIG. 1 is a perspective view of an optical device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0046] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] However, the technical concept of the present invention is not limited to the described embodiments, but can be realized in various different forms, and one or more of the components of the embodiments can be selectively combined or substituted and used within the scope of the technical concept of the present invention.

[0048] 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 the sense that they are commonly understood by a person of ordinary skill in the art to which the present invention belongs, and commonly used terms, such as dictionary-defined terms, may be interpreted in the sense that they are commonly understood by a person of ordinary skill in the art, taking into account the contextual meaning of the relevant art.

[0049] Furthermore, the terms used in the examples of the present invention are intended to explain the examples and are not intended to limit the present invention.

[0050] In this specification, unless otherwise specified in the phrase, the singular can also include the plural, and when it says "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.

[0051] Furthermore, in describing components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. are used only to distinguish the component from other components, and the terms do not limit the essence, order, or sequence of the components.

[0052] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it can include not only cases where the component is directly "coupled," "coupled," or "connected" to the other component, but also cases where the component is "coupled," "coupled," or "connected" by another component between the component and the other component.

[0053] Furthermore, when described as being formed or disposed "above (above)" or "below (below)" each component, "above (above)" or "below (below)" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or disposed between the two components. Furthermore, when described as "above (above)" or "below (below)," it can include not only the upward direction but also the downward direction based on one component.

[0054] The lens driving device according to this embodiment will be described below with reference to the drawings.

[0055] Figure 1 is an oblique view of a lens driving device according to this embodiment, Figure 2 is a plan view of the lens driving device according to this embodiment, Figure 3 is an exploded oblique view of the lens driving device according to this embodiment, Figure 4 is an oblique view of a fixed portion in the lens driving device according to this embodiment, Figure 5 is a plan view of the fixed portion in the lens driving device according to this embodiment, Figure 6 is an oblique view of a moving portion in the lens driving device according to this embodiment, and Figure 7 is a plan view of the moving portion in the lens driving device according to this embodiment.

[0056] The lens driving device may be a lens driving actuator. The lens driving device may be a voice coil motor (VCM). The lens driving device may be a lens driving motor. The lens driving device may include an AF module. The lens driving device may include an OIS module.

[0057] The lens driving device 10 according to this embodiment can include a fixed portion 100 .

[0058] The fixed part 100 may be a stator. The fixed part 100 may be a part that is relatively fixed when the moving part 200 moves. The fixed part 100 may include a lower plate 110, a first side plate 121, a second side plate 122, a third side plate 123, and a fourth side plate 124. The first side plate 121, the second side plate 122, the third side plate 123, and the fourth side plate 124 may be disposed on the lower plate 110.

[0059] The lower plate 110 may include a lens hole 111. The lens hole 111 may be a hole that penetrates the lower plate 110 in the optical axis direction. The lens hole 111 may be a hole that has a circular cross section. A lens may be disposed in the lens hole 111.

[0060] The first side plate 121 may be a side surface of the fixing part 100. The first side plate 121 may protrude from the upper surface of the lower plate 110. The first side plate 121 may be disposed on the opposite side of the second side plate 122. The first side plate 121 may be connected to the third side plate 123. The first side plate 121 may be connected to the fourth side plate 124. The first side plate 121 may include a hole 141. The hole 141 of the first side plate 121 may be formed in a direction perpendicular to the optical axis direction. A first coil 151 may be disposed in the hole 141 of the first side plate 121. The hole 141 of the first side plate 121 may be rectangular.

[0061] The first side plate 121 may include a first protrusion 131. The first protrusion 131 may protrude from the inner surface of the first side plate 121 toward the inside of the fixed part 100. The first protrusion 131 may include a step recessed from the inside to the outside of the fixed part 100. The step of the first protrusion 131 may include a plurality of steps. The first protrusion 131 may include a groove. The groove of the first protrusion 131 may be a groove in which a first ball 310, which will be described later, is disposed. The second side plate 122 may be a side surface of the fixed part 100.

[0062] The second side plate 122 may protrude from the upper surface of the lower plate 110. The second side plate 122 may be disposed on the opposite side of the first side plate 121. The second side plate 122 may be connected to the third side plate 123. The second side plate 122 may be connected to the fourth side plate 124. The second side plate 122 may include a step 161 recessed from the inside to the outside of the fixed part 100. The step 161 of the second side plate 122 may correspond to the step 232 of the second side surface 212 of the moving part 200.

[0063] The third side plate 123 may be a side surface of the fixing part 100. The third side plate 123 may protrude from the upper surface of the lower plate 110. The third side plate 123 may be disposed opposite the fourth side plate 124. The third side plate 123 may be connected to the first side plate 121. The third side plate 123 may be connected to the second side plate 122. The third side plate 123 may include a hole 142. The hole 142 of the third side plate 123 may be a hole formed in a direction perpendicular to the optical axis direction.

[0064] The second coil 152 may be disposed in the hole of the third side plate 123. The hole of the third side plate 123 may be rectangular. The third side plate 123 may include a second protrusion 132. The second protrusion 132 may protrude from the inner surface of the third side plate 123 toward the inside of the fixed part 100. The second protrusion 132 may include a groove. The groove of the second protrusion 132 may be a groove in which a second ball 320, which will be described later, is disposed. The groove of the second protrusion 132 may be a groove recessed in a direction from the second side plate 122 toward the inside of the fixed part 100. The second ball 320 may be disposed in the groove of the second protrusion 132.

[0065] The fourth side plate 124 may be a side surface of the fixed part 100. The fourth side plate 124 may protrude from the upper surface of the lower plate 110. The fourth side plate 124 may be disposed on the opposite side of the third side plate 123. The fourth side plate 124 may be connected to the first side plate 121. The fourth side plate 124 may be connected to the second side plate 122. The fourth side plate 124 may include a step 162 recessed from the inside to the outside of the fixed part 100. The step 162 of the fourth side plate 124 may correspond to the step 231 of the fourth side surface 214 of the moving part 200.

[0066] A Hall sensor (not shown) may be disposed on the fixed part 100. The Hall sensor may be disposed on the first side plate 121. The Hall sensor may be disposed between the first coil 151 and a connection portion where the first side plate 121 and the third side plate 123 are connected. The Hall sensor may also be disposed on at least one of the first to fourth side plates 121 to 124. For example, the Hall sensor may be disposed on a corner portion of the fixed part 100 where the first side plate 121 and the third side plate 123 intersect. For example, the Hall sensor may be disposed on a corner portion of the fixed part 100 where the second side plate 122 and the fourth side plate 124 intersect. The Hall sensor can sense the relative position of the moving part 200 with respect to the fixed part 100. The Hall sensor can sense the relative position of the moving part 200 with respect to the fixed part 100 via a sensing magnet (not shown). The sensing magnet may be disposed on the first side surface 211 of the moving part 200. The sensing magnet may be disposed at a position facing the Hall sensor. However, if the Hall sensor is disposed on the first side surface 211 of the moving part 200, the sensing magnet may be disposed on the first side plate 121. The lens driving device 10 according to this embodiment may include the moving part 200.

[0067] The moving unit 200 may be a moving unit. The moving unit may be a mover. The moving unit 200 may be a mover. The moving unit 200 can move relative to the fixed unit 100. The moving unit 200 may include an AF moving unit. The moving unit 200 may include an OIS moving unit. The moving unit 200 can move in the optical axis direction relative to the fixed unit 100. The moving unit 200, together with the OIS moving unit, can move in a direction perpendicular to the optical axis relative to the fixed unit 100.

[0068] The moving part 200 may include a lens hole 201. The lens hole 201 of the moving part 200 may be a hole that penetrates the moving part 200 in the optical axis direction. A lens may be disposed in the lens hole 201 of the moving part 200. The lens hole 201 of the moving part 200 may overlap with the lens hole 111 of the fixed part 100 in the optical axis direction.

[0069] The moving part 200 may include a first side surface 211. The first side surface 211 may face the first side plate 121. The first side surface 211 may overlap the first side plate 121 in a direction perpendicular to the first side plate 121 and the optical axis direction. The first side surface 211 may overlap the first yoke 410 in a direction perpendicular to the first yoke 410 and the optical axis direction. The first side surface 211 may be disposed in the opposite direction to the second side surface 212. The first side surface 211 may be connected to the third side surface 213. The first side surface 211 may be connected to the fourth side surface 214.

[0070] The first side surface 211 may include a first groove 221. The first groove 221 may be disposed at a position corresponding to the first protrusion 131 of the first side plate 121. The first protrusion 131 may be disposed in the first groove 221. The first ball 310 may be disposed in the first groove 221. The first groove 221 may be in contact with the first ball 310. The first groove 221 may be in two-point contact with the first ball 310. A drive magnet may be disposed on the first side surface 211. A first drive magnet 241 may be disposed on the first side surface 211. The first drive magnet 241 may be bonded to the first side surface 211. The first drive magnet 241 may be bonded to the first side surface 211 by an adhesive.

[0071] The moving part 200 may include a second side surface 212. The second side surface 212 may be disposed in the opposite direction to the first side surface 211. The second side surface 212 may be connected to the third side surface 213. The second side surface 212 may be connected to the fourth side surface 214. The second side surface 212 may include a step 232. The step 232 of the second side surface 212 may be a step recessed from the outer surface of the second side surface 212 toward the inside of the moving part 200. The step 232 of the second side surface 212 may correspond to the step 161 of the second side panel 122.

[0072] The moving part 200 may include a third side surface 213. The third side surface 213 may face the third side plate 123. The third side surface 213 may overlap the third side plate 123 in a direction perpendicular to the third side plate 123 and the optical axis direction. The third side surface 213 may overlap the second yoke 420 in a direction perpendicular to the second yoke 420 and the optical axis direction. The third side surface 213 may be disposed in the opposite direction to the fourth side surface 214. The third side surface 213 may be connected to the first side surface 211. The third side surface 213 may be connected to the second side surface 212.

[0073] The third side surface 213 may include a second groove 222. The second groove 222 may be disposed at a position corresponding to the second protrusion 132 of the third side plate 123. The second protrusion 132 may be disposed in the second groove 222. The second ball 320 may be disposed in the second groove 222. The second groove 222 may be in contact with the second ball 320. The second groove 222 may be in two-point contact with the second ball 320. A drive magnet may be disposed on the third side surface 213. A second drive magnet 242 may be disposed on the third side surface 213. The second drive magnet 242 may be bonded to the third side surface 213. The second drive magnet 242 may be bonded to the third side surface 213 by an adhesive.

[0074] The moving part 200 may include a fourth side surface 214. The fourth side surface 214 may be disposed in the opposite direction to the third side surface 213. The fourth side surface 214 may be connected to the first side surface 211. The fourth side surface 214 may be connected to the second side surface 212. The fourth side surface 214 may include a step 231. The step 231 of the fourth side surface 214 may be a step recessed from the outer surface of the fourth side surface 214 toward the inside of the moving part 200. The step of the fourth side surface 214 may correspond to the step 162 of the fourth side panel 124.

[0075] A Hall sensor (not shown) may be disposed on the moving part 200. The Hall sensor may be disposed on the first side surface 211. The Hall sensor may be disposed between a connection part connecting the first side surface 211 and the third side surface 213 and the first driving magnet 241. The Hall sensor may sense the relative position of the moving part 200 with respect to the fixed part 100. The Hall sensor may sense the relative position of the moving part 200 with respect to the fixed part 100 via a sensing magnet (not shown). The sensing magnet may be disposed on the first side plate 121 of the fixed part 100. The sensing magnet may be disposed at a position facing the Hall sensor. However, when the Hall sensor is disposed on the first side plate 121 of the fixed part 100, the sensing magnet may be disposed on the first side surface 211.

[0076] The lens driving device 10 according to this embodiment may include balls 310 and 320 .

[0077] The balls 310 and 320 may be AF balls. The balls 310 and 320 may support the moving unit 200. The balls 310 and 320 may support the moving unit 200, which moves in the optical axis direction relative to the fixed unit 100. The balls 310 and 320 may guide the moving unit 200, which moves in the optical axis direction relative to the fixed unit 100. The balls 310 and 320 may include multiple balls. The multiple balls may include a first ball 310 and a second ball.

[0078] The first ball 310 may be disposed on the first side plate 121. The first ball 310 may be disposed between the first side plate 121 and the fourth side plate 124. The first ball 310 may be disposed in the groove of the first protrusion 131. The first ball 310 may be disposed in a stepped region of the first protrusion 131. The first ball 310 may be in contact with the first protrusion 131. The first ball 310 may be in two-point contact with the first protrusion 131. The first ball 310 may be disposed in the first groove 221 of the first side surface 211. The first ball 310 may be in two-point contact with the first groove 221. The first ball 310 may be in contact with the first protrusion 131 within the first groove 221. The first ball 310 may be disposed between the first protrusion 131 and the first groove 221.

[0079] The first ball 310 may include a plurality of first balls 310. The plurality of first balls 310 may be arranged in the optical axis direction. The plurality of first balls 310 may have the same diameter. The plurality of first balls 310 may have different diameters. Among the plurality of first balls 310, any one of the plurality of first balls 310 may have a different diameter. Among the plurality of first balls 310, any two of the plurality of first balls 310 may have different diameters.

[0080] The second ball 320 may be disposed on the third side plate 123. The second ball 320 may be disposed between the second side plate 122 and the third side plate 123. The second ball 320 may be disposed in the groove of the second protrusion 132. The second ball 320 may be disposed in a step region of the second protrusion 132. The second ball 320 may be in contact with the second protrusion 132. The second ball 320 may be in two-point contact with the second protrusion 132. The second ball 320 may be disposed in the second groove 222 of the third side surface 213. The second ball 320 may be in two-point contact with the second groove 222. The second ball 320 may be in contact with the second protrusion 132 within the second groove 222. The second ball 320 may be disposed between the second protrusion 132 and the second groove 222.

[0081] The second ball 320 may include a plurality of second balls 320. The plurality of second balls 320 may be arranged in the optical axis direction. The plurality of second balls 320 may have the same diameter. The plurality of second balls 320 may have different diameters. The plurality of second balls 320 may have only one different diameter.

[0082] The lens driving device 10 according to this embodiment may include yokes 410 and 420 .

[0083] The yokes 410 and 420 may be metal plates. The yokes 410 and 420 may be part of the cover of the lens driving device. Although the cover of the lens driving device 10 is omitted in the drawings, the yokes 410 and 420 may correspond to part of the cover of the lens driving device 10. The yokes 410 and 420 may extend from the cover of the lens driving device. The yokes 410 and 420 may be arranged to overlap the driving magnets 241 and 242 in a direction perpendicular to the optical axis direction. The yokes 410 and 420 may be arranged outside the fixed part 100.

[0084] The yokes 410 and 420 may include a first yoke 410. The first yoke 410 may be disposed to overlap with a first side plate 121 of the fixed part 100 in a direction perpendicular to the optical axis direction. The yokes 410 and 420 may include a second yoke 420. The second yoke 420 may be disposed to overlap with a third side plate 123 of the fixed part 100 in a direction perpendicular to the optical axis direction.

[0085] The moving unit 200 can move a predetermined distance in the direction of the first corner region due to the magnetic force acting between the first yoke 410 and the first drive magnet 241 and the magnetic force acting between the second yoke 420 and the second drive magnet 242. The moving unit 200 can be tightly attached in the direction of the first corner region within the fixed unit 100 due to the magnetic force acting between the first yoke 410 and the first drive magnet 241 and the magnetic force acting between the second yoke 420 and the second drive magnet 242. Here, the first corner region may be a region where the first side plate 121 and the third side plate 123 are connected. The first corner region may be a region between the first side plate 121 and the third side plate 123.

[0086] Since the moving part 200 is in close contact with the first corner region within the fixed part 100, the moving part 200 can be stably supported by the first ball 310 and the second ball 320 disposed between the moving part 200 and the fixed part 100.

[0087] Since the moving part 200 is tightly fitted in the direction of the first corner region within the fixed part 100 and is supported by the first ball 310 and the second ball 320, the moving part 200 can stably move in the optical axis direction within the fixed part 100. Furthermore, since the moving part 200 is driven by a driving force resulting from the interaction between the first drive magnet 241 and the first coil 151 and a driving force resulting from the interaction between the second drive magnet 242 and the second coil 151, it can be driven with a larger driving force than when driven by one drive magnet and one coil.

[0088] The lens driving device according to the first modification will be described below with reference to the drawings. In relation to the first modification, the description of the same content as in the above embodiment can be omitted below.

[0089] Figure 10 is an oblique view of a fixed portion in a lens driving device according to the first modified example, Figure 11 is a plan view of a fixed portion in a lens driving device according to the first modified example, Figure 12 is an oblique view of a moving portion in a lens driving device according to the first modified example, Figure 13 is a plan view of a moving portion in a lens driving device according to the first modified example, and Figure 14 is a diagram showing that the moving portion is tilted at the fixed portion in a lens driving device according to the first modified example.

[0090] The lens driving device 10 according to the first modification can include a fixing portion 1100 .

[0091] The fixing part 1100 may include a first side plate 1121. The first side plate 1121 may be a side surface of the fixing part 1100. The first side plate 1121 may protrude from the upper surface of the lower plate 1110. The first side plate 1121 may be disposed on the opposite side of the second side plate 1122. The first side plate 1121 may be connected to the third side plate 1123. The first side plate 1121 may be connected to the fourth side plate 1124. The first side plate 1121 may include a hole. The hole 1141 of the first side plate 1121 may be formed in a direction perpendicular to the optical axis direction. A first coil 1151 may be disposed in the hole 1141 of the first side plate 1121. The hole 1141 of the first side plate 1121 may be rectangular.

[0092] The first side plate 1121 may include a first protrusion 1131. The first protrusion 1131 may protrude from the inner surface of the first side plate 1121 toward the inside of the fixed part 1100. The first protrusion 1131 may include a step recessed from the inside to the outside of the fixed part 1100. The step of the first protrusion 1131 may include a plurality of steps. The first protrusion 1131 may include a groove. The groove of the first protrusion 1131 may be a groove in which a first ball 3310, which will be described later, is disposed.

[0093] The second side plate 1122 may be a side surface of the fixing part 1100. The second side plate 1122 may protrude from the upper surface of the lower plate 1110. The second side plate 1122 may be disposed on the opposite side of the first side plate 1121. The second side plate 1122 may be connected to the third side plate 1123. The second side plate 1122 may be connected to the fourth side plate 1124.

[0094] The second side plate 1122 may include a hole 1142. The hole 1142 of the second side plate 1122 may be a hole formed in a direction perpendicular to the optical axis direction. A second coil 1152 may be disposed in the hole of the second side plate 1122. The hole 1142 of the second side plate 1122 may be rectangular. The second side plate 1122 may include a second protrusion 1132. The second protrusion 1132 may protrude from the inner surface of the second side plate 1122 toward the inside of the fixed part 1100. The second protrusion 1132 may include a groove. The groove of the second protrusion 1132 may be a groove in which the second ball 3320 is disposed. The groove of the second protrusion 1132 may be a groove recessed in a direction from the second side plate 1122 toward the inside of the fixed part 1100. The second protrusion 1132 may be rotationally symmetrical to the first protrusion 1131 about the optical axis.

[0095] The third side plate 1123 may be a side surface of the fixing part 1100. The third side plate 1123 may protrude from the upper surface of the lower plate 1110. The third side plate 1123 may be disposed on the opposite side of the fourth side plate 1124. The third side plate 1123 may be connected to the first side plate 1121. The third side plate 1123 may be connected to the second side plate 1122.

[0096] The fourth side plate 1124 may be a side surface of the fixed part 1100. The fourth side plate 1124 may protrude from the upper surface of the lower plate 1110. The fourth side plate 1124 may be disposed opposite the third side plate 1123. The fourth side plate 1124 may be connected to the first side plate 1121. The fourth side plate 1124 may be connected to the second side plate 1122. The fourth side plate 1124 may include a step 1161 recessed from the inside to the outside of the fixed part 1100. The step 1161 of the fourth side plate 1124 may correspond to the step 1161 of the fourth side surface 2214 of the moving part.

[0097] The lens driving device 10 according to the first modification can include a moving part 2200 .

[0098] The moving part 2200 may include a first side surface 2211. The first side surface 2211 may face the first side plate 1121. The first side surface 2211 may overlap the first side plate 1121 in a direction perpendicular to the first side plate 1121 and the optical axis direction. The first side surface 2211 may overlap the first yoke 4410 in a direction perpendicular to the first yoke 4410 and the optical axis direction. The first side surface 2211 may be disposed in the opposite direction to the second side surface 2212. The first side surface 2211 may be connected to the third side surface 2213. The first side surface 2211 may be connected to the fourth side surface 2214.

[0099] The first side surface 2211 may include a first groove 2221. The first groove 2221 may be disposed at a position corresponding to the first protrusion 1131 of the first side plate 1121. The first protrusion 1131 may be disposed in the first groove 2221. The first ball 3310 may be disposed in the first groove 2221. The first groove 2221 may be in contact with the first ball 3310. The first groove 2221 may be in two-point contact with the first ball 3310. A drive magnet may be disposed on the first side surface 2211. A first drive magnet 2241 may be disposed on the first side surface 2211. The first drive magnet 2241 may be bonded to the first side surface 2211. The first drive magnet 2241 may be bonded to the first side surface 2211 by an adhesive.

[0100] The moving part 2200 may include a second side surface 2212. The second side surface 2212 may face the second side plate 1122. The second side surface 2212 may overlap with the second side plate 1122 in a direction perpendicular to the second side plate 1122 and the optical axis direction. The second side surface 2212 may overlap with the second yoke 4420 in a direction perpendicular to the optical axis direction. The second side surface 2212 may be disposed in the opposite direction to the first side surface 2211. The second side surface 2212 may be connected to the third side surface 2213. The second side surface 2212 may be connected to the fourth side surface 2214.

[0101] The second side surface 2212 may include a second groove 2222. The second groove 2222 may be disposed at a position corresponding to the second protrusion 1132 of the second side plate 1122. The second groove 2222 may be rotationally symmetrical with the first groove 2221 about the optical axis. The second protrusion 1132 may be disposed in the second groove 2222. The second ball 3320 may be disposed in the second groove 2222. The second groove 2222 may be in contact with the second ball 3320. The second groove 2222 may be in two-point contact with the second ball 3320. A drive magnet may be disposed on the second side surface 2212. A second drive magnet 2242 may be disposed on the second side surface. The second drive magnet 2242 may be bonded to the second side surface 2212. The second drive magnet 2242 may be bonded to the second side surface 2212 by an adhesive.

[0102] The moving part 2200 may include a third side 2213. The third side 2213 may be disposed in the opposite direction to the fourth side 2214. The third side 2213 may be connected to the first side 2211. The third side 2213 may be connected to the second side 2212.

[0103] The moving part may include a fourth side surface 2214. The fourth side surface 2214 may be disposed in the opposite direction to the third side surface 2213. The fourth side surface 2214 may be connected to the first side surface 2211. The fourth side surface 2214 may be connected to the second side surface 2212. The fourth side surface 2214 may include a step 2231. The step 2231 of the fourth side surface 2214 may be a step recessed from the outer surface of the fourth side surface 2214 toward the inside of the moving part. The step 2231 of the fourth side surface 2214 may correspond to the step 1161 of the fourth side panel 1124.

[0104] The lens driving device 10 according to the first modification may include balls 3310 and 3320 .

[0105] The balls 3310 and 3320 may be AF balls. The balls 3310 and 3320 may support the moving part 2200. The balls 3310 and 3320 may support the moving part 2200, which moves in the optical axis direction relative to the fixed part 1100. The balls 3310 and 3320 may include a plurality of balls. The plurality of balls may include a first ball 3310 and a second ball 3320.

[0106] The first ball 3310 may be disposed on the first side plate 1121. The first ball 3310 may be disposed in a groove of the first protrusion 1131. The first ball 3310 may be disposed in a stepped region of the first protrusion 1131. The first ball 3310 may be in contact with the first protrusion 1131. The first ball 3310 may be in two-point contact with the first protrusion 1131. The first ball 3310 may be disposed in the first groove 2221 of the first side surface 2211. The first ball 3310 may be in two-point contact with the first groove 2221. The first ball 3310 may be in contact with the first protrusion 1131 within the first groove 2221.

[0107] The lens driving device 10 according to the first modification may include yokes 4410 and 4420 .

[0108] The yoke may include a first yoke 4410. The first yoke 4410 may be disposed so as to overlap with the first side plate 1121 of the fixed part 1100 in a direction perpendicular to the optical axis direction. With reference to FIG. 9, the center of the first yoke 4410 in the longitudinal direction may be disposed to the right of the center of the lens hole.

[0109] The yoke may include a second yoke 4420. The second yoke 4420 may be arranged to overlap the second side plate 1122 of the fixed part 1100 in a direction perpendicular to the optical axis direction. With reference to FIG. 9 , the center of the second yoke 4420 in the longitudinal direction may be arranged to the left of the center of the lens hole.

[0110] Referring to FIG. 14, the magnetic force between the first drive magnet 2241 and the first yoke 4410 and the magnetic force between the second drive magnet 2242 and the second yoke 4420 can cause the moving part 2200 to tilt around the optical axis within the fixed part 1100.

[0111] The moving part 2200 can be tilted about the optical axis by the magnetic force acting between the first yoke 4410 and the first drive magnet 2241 and the magnetic force acting between the second yoke 4420 and the second drive magnet 2242. The moving part 2200 can be closely attached to the first ball 3310 and the second ball 3320 by the magnetic force acting between the first yoke 4410 and the first drive magnet 2241 and the magnetic force acting between the second yoke 4420 and the first drive magnet 2242. The fixed part 1100 can be closely attached to the first ball 3310 and the second ball 3320 by the magnetic force acting between the first yoke 4410 and the first drive magnet 2241 and the magnetic force acting between the second yoke 4420 and the second drive magnet 2242. Therefore, the moving part 2200 can be stably supported by the first ball 3310 and the second ball 3320 within the fixed part 1100, and the moving part 2200 can stably move in the optical axis direction within the fixed part 1100. Furthermore, since the moving part 2200 is driven by a driving force due to the interaction between the first drive magnet 2241 and the first coil 1151 and a driving force due to the interaction between the second drive magnet 2242 and the second coil 1152, it can be driven by a larger driving force than when driven by one drive magnet and one coil.

[0112] A lens driving device according to a second modified example will be described below with reference to the drawings. In relation to the modified example, the description of the same content as in the above embodiment can be omitted below.

[0113] The lens driving device 10 according to the second modification can include a fixing portion 5100 .

[0114] The fixed part 5100 may be a stator. The fixed part 5100 may be a part that is relatively fixed when the moving part 5200 moves. The fixed part 5100 may include a first side plate 5121, a second side plate 5122 disposed on the opposite side of the first side plate 5121, a third side plate 5123 connected to the first side plate 5121 and the second side plate 5122, and a fourth side plate 5124 disposed on the opposite side of the third side plate 5123 and connected to the first side plate 5121 and the second side plate 5122.

[0115] The first side plate 5121 may include a first protrusion 5131. The first protrusion 5131 may protrude from the inner surface of the first side plate 5121 toward the inside of the fixing portion 5100. The first protrusion 5131 may be disposed in a corner region between the first side plate 5121 and the third side plate 5123. The third side plate 5123 may include a second protrusion 5132. The second protrusion 5132 may protrude from the inner surface of the third side plate 5123 toward the inside of the fixing portion 5100. The second protrusion 5132 may be disposed in the corner region between the first side plate 5121 and the third side plate 5123.

[0116] The lens driving device 10 according to the second modification can include a moving unit 5200 .

[0117] The moving part 5200 may include a first side 5211, a second side 5212 arranged in the opposite direction of the first side, a third side 5213 connected to the first side 5211 and the second side 5212, and a fourth side 5214 connected to the first side 5211 and the second side 5212 and arranged in the opposite direction of the third side 5213.

[0118] The first side surface 5211 may include a first groove. The first groove may be disposed at a position corresponding to the first protrusion 5131 of the first side plate 5121. The first protrusion 5131 may be disposed in the first groove. A first ball 5310 may be disposed in the first groove.

[0119] A first drive magnet may be disposed on the first side surface 5211. The first drive magnet may be disposed to overlap the first yoke 5410 in a direction perpendicular to the optical axis. The first drive magnet may be disposed to overlap the first coil disposed on the first side plate 5121 in a direction perpendicular to the optical axis.

[0120] The third side surface 5213 may include a second groove. The second groove may be disposed at a position corresponding to the second protrusion 5132 of the third side plate 5123. The second protrusion 5132 may be disposed in the second groove. A second ball 5320 may be disposed in the second groove.

[0121] A second drive magnet may be disposed on the third side surface 5213. The second drive magnet may be disposed to overlap the second yoke 5420 in a direction perpendicular to the optical axis. The second drive magnet may be disposed to overlap the second coil disposed on the third side plate 5123 in a direction perpendicular to the optical axis.

[0122] The lens driving device 10 according to the second modification may include a first ball 5310 and a second ball 5320 .

[0123] The first ball 5310 and the second ball 5320 may be disposed in a corner region between the first side plate 5121 and the third side plate 5123. The first ball 5310 and the second ball 5320 may be disposed spaced apart from each other.

[0124] The lens driving device 10 according to the second modification may include yokes 5410 and 5420. The yokes 5410 and 5420 may include a first yoke 5410. The first yoke 5410 may be arranged to overlap with a first driving magnet arranged on a first side surface 5211 in a direction perpendicular to the optical axis direction. The yokes 5410 and 5420 may include a second yoke 5420. The second yoke 5420 may be arranged to overlap with a second driving magnet arranged on a third side surface 5213 in a direction perpendicular to the optical axis direction.

[0125] The moving unit 5200 can move a predetermined distance toward the first corner region due to a magnetic force acting between the first yoke 5410 and the first drive magnet disposed on the first side surface 5211 and a magnetic force acting between the second yoke 5420 and the second drive magnet disposed on the third side surface 5213. The moving unit 5200 can be tightly attached toward the first corner region within the fixed unit 5100 due to a magnetic force acting between the first yoke 5410 and the first drive magnet disposed on the first side surface 5211 and a magnetic force acting between the second yoke 5420 and the second drive magnet disposed on the third side surface 5213. Here, the first corner region may be a region where the first side plate 5121 and the third side plate 5123 are connected. The first corner region may be a region between the first side plate 5121 and the third side plate 5123.

[0126] Since the moving part 5200 is in close contact with the first corner region within the fixed part 5100 , the moving part 5200 can be stably supported by the first ball 5310 and the second ball 5320 disposed between the moving part 5200 and the fixed part 5100 .

[0127] Since the moving part 5200 is tightly fitted in the direction of the first corner region within the fixed part 5100 and is supported by the first ball 5310 and the second ball 5320, the moving part 5200 can stably move in the optical axis direction within the fixed part 5100. In addition, since the moving part 5200 is driven by a driving force resulting from the interaction between the first driving magnet and the first coil and a driving force resulting from the interaction between the second driving magnet and the second coil, it can be driven with a larger driving force than when driven by one driving magnet and one coil.

[0128] The autofocus (AF) driving of the lens driving device 10 will be described below with reference to the drawings.

[0129] 16 to 18 are diagrams for explaining autofocus driving of the lens driving device according to this embodiment. Fig. 16 is a cross-sectional view showing the state of the moving part in an initial state in which no current is applied to the first coil. Fig. 17 is a cross-sectional view showing the state in which a forward current is applied to the first coil and the moving part has moved upward in the optical axis direction. Fig. 18 is a cross-sectional view showing the state in which a reverse current is applied to the first coil and the moving part has moved downward in the optical axis direction based on the position of the moving part in Fig. 17.

[0130] The moving part may be disposed on the lower plate 110 of the fixed part 100 in an initial position where no current is applied to the first coil 151 and the second coil 152 .

[0131] When a forward current is applied to the first coil 151, the first drive magnet 241 can move upward in the optical axis direction due to electromagnetic interaction between the first coil 151 and the first drive magnet 241. When a forward current is applied to the second coil 152, the second drive magnet 242 can move upward in the optical axis direction due to electromagnetic interaction between the second coil 152 and the second drive magnet 242. At this time, the moving unit 200 can move upward in the optical axis direction together with the first drive magnet 241 and the second drive magnet 242. Furthermore, the lens in the lens hole 111 can move upward in the optical axis direction together with the moving unit 200. This changes the distance between the lens and the image sensor, and the focus of the image formed on the image sensor through the lens can be adjusted.

[0132] When a reverse current is applied to the first coil 151, the first drive magnet 241 can move downward in the optical axis direction due to electromagnetic interaction between the first coil 151 and the first drive magnet 241. When a reverse current is applied to the second coil 152, the second drive magnet 242 can move downward in the optical axis direction due to electromagnetic interaction between the second coil 152 and the second drive magnet 242. At this time, the moving unit 200 can move downward in the optical axis direction together with the first drive magnet 241 and the second drive magnet 242. Furthermore, the lens in the lens hole 111 can move downward in the optical axis direction together with the moving unit 200. This changes the distance between the lens and the image sensor, and the focus of the image formed on the image sensor through the lens can be adjusted.

[0133] FIG. 19 is an exploded perspective view of the camera device according to this embodiment.

[0134] The camera device 10A may include a lens module 20. The lens module 20 may include at least one lens. The lens may be disposed at a position corresponding to the image sensor 60. The lens module 20 may include a lens and a barrel.

[0135] The camera device 10A may include a filter 30. The filter 30 can serve to block light of a specific frequency band, which is included in light passing through the lens module 20, from entering the image sensor 60. The filter 30 may be arranged parallel to the xy plane. The filter 30 may be arranged between the lens module 20 and the image sensor 60. The filter 30 may be arranged on the sensor base 40. Alternatively, the filter 30 may be arranged on the base 110. The filter 30 may include an infrared filter. The infrared filter can block light in the infrared region from entering the image sensor 60.

[0136] The camera device 10A may include a sensor base 40. The sensor base 40 may be disposed between the lens driver 10 and the printed circuit board 50. The sensor base 40 may include a protrusion 41 on which the filter 30 is disposed. An opening may be formed in the portion of the sensor base 40 on which the filter 30 is disposed so that light passing through the filter 30 can be incident on the image sensor 60. An adhesive may bond or adhere the lens driver 10 to the sensor base 40. The adhesive may also serve to prevent foreign matter from entering the interior of the lens driver 10. The adhesive may include one or more of epoxy, a heat-curable adhesive, and an ultraviolet-curable adhesive.

[0137] The camera device 10A may include a printed circuit board (PCB) 50. The printed circuit board 50 may be a substrate or a circuit board. The lens driver 10 may be disposed on the printed circuit board 50. A sensor base 40 may be disposed between the printed circuit board 50 and the lens driver 10. The printed circuit board 50 may be electrically connected to the lens driver 10. An image sensor 60 may be disposed on the printed circuit board 50. The printed circuit board 50 may include various circuits, elements, a control unit, etc. for converting an image formed on the image sensor 60 into an electrical signal and transmitting the signal to an external device.

[0138] The camera device 10A may include an image sensor 60. The image sensor 60 may be configured to form an image when light passing through the lens and the filter 30 is incident on the image sensor 60. The image sensor 60 may be mounted on a printed circuit board 50. The image sensor 60 may be electrically connected to the printed circuit board 50. For example, the image sensor 60 may be attached to the printed circuit board 50 using surface mounting technology (SMT). For another example, the image sensor 60 may be attached to the printed circuit board 50 using flip chip technology. The image sensor 60 may be disposed so that its optical axis coincides with that of a lens. That is, the optical axis of the image sensor 60 may be aligned with the optical axis of the lens. The image sensor 60 may convert light irradiated onto an effective image area of ​​the image sensor 60 into an electrical signal. The image sensor 60 may be any one of a charge coupled device (CCD), a metal oxide semiconductor (MOS), a CPD, and a CID.

[0139] The camera device 10A may include a motion sensor 70. The motion sensor 70 may be mounted on the printed circuit board 50. The motion sensor 70 may be electrically connected to the control unit 80 via a circuit pattern provided on the printed circuit board 50. The motion sensor 70 may output rotational angular velocity information according to the movement of the camera device 10A. The motion sensor 70 may include a two-axis or three-axis gyro sensor or an angular velocity sensor.

[0140] The camera device 10A may include a control unit 80. The control unit 80 may be disposed on the printed circuit board 50. The control unit 80 may be electrically connected to the coils of the lens driving device 10. The control unit 80 may individually control the direction, strength, amplitude, etc. of the current supplied to the coils. The control unit 80 may control the lens driving device 10 to perform an autofocus function and / or an image stabilization function. Furthermore, the control unit 80 may perform autofocus feedback control and / or image stabilization feedback control for the lens driving device 10.

[0141] The camera device 10A may include a connector 90. The connector 90 is electrically connectable to the printed circuit board 50. The connector 90 may include a port for electrically connecting to an external device.

[0142] Hereinafter, the optical device according to this embodiment will be described with reference to the drawings.

[0143] FIG. 20 is a perspective view of the optical device according to this embodiment.

[0144] The optical device 1 may include one or more of a mobile phone, a portable terminal, a mobile terminal, a smartphone, a smart pad, a portable smart device, a digital camera, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), and a navigation system. The optical device 1 may include any device for taking images or photographs.

[0145] The optical device 1 may include a main body 20. The optical device 1 may include a camera device 10A. The camera device 10A may be disposed in the main body 20. The camera device 10A may photograph an object. The optical device 1 may include a display. The display may be disposed in the main body 20. The display may output one or more of a video and an image photographed by the camera device 10A. The display may be disposed on a first surface of the main body 20. The camera device 10A may be disposed on one or more of the first surface and a second surface opposite the first surface of the main body 20. As shown in FIG. 20 , the camera device 10A may have a triple camera disposed vertically. As shown in FIG. 23 , the camera device 10A may have a triple camera disposed horizontally.

[0146] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and are not limiting.

Claims

1. A fixed portion; a moving part disposed within the fixed part; a drive magnet disposed on the moving part; a coil disposed on the fixed portion so as to correspond to the drive magnet; a ball disposed between the fixed portion and the moving portion, the ball guides the moving part to move in the optical axis direction relative to the fixed part; the fixing portion includes a first side plate and a second side plate disposed on opposite sides to each other, and a third side plate and a fourth side plate connecting the first side plate and the second side plate and disposed on opposite sides to each other, the moving portion includes a first side surface and a second side surface that are disposed opposite to each other, and a third side surface and a fourth side surface that connect the first side surface and the second side surface and are disposed opposite to each other, the first to fourth side plates face the first to fourth side surfaces, the drive magnet moves the moving part in the optical axis direction through interaction with the coil, the drive magnet includes a first drive magnet arranged on the first side surface of the moving part and a second drive magnet arranged on the third side surface of the moving part, A lens driving device, wherein the balls include a first ball arranged in a first corner region where the first side plate and the fourth side plate of the fixed part are connected, and a second ball arranged in a second corner region where the second side plate and the third side plate of the fixed part are connected.

2. the first side plate includes a first protrusion protruding from an inner surface of the first side plate, the first protrusion includes a groove; The lens driving device according to claim 1 , wherein the first ball is disposed in the groove of the first side plate.

3. the third side plate includes a second protruding portion protruding from an inner surface of the third side plate, the second protrusion includes a groove; The lens driving device according to claim 2 , wherein the second ball is disposed in the groove of the third side plate.

4. the first side surface includes a first groove formed from a surface of the first side surface to an inside of the moving portion, The lens driving device according to claim 3 , wherein the third side surface includes a second groove formed from a surface of the third side surface to an inside of the moving portion.

5. the first protrusion of the first side plate is disposed in the first groove of the first side surface, The lens driving device according to claim 4 , wherein the second protrusion of the third side plate is disposed in the second groove of the third side surface.

6. the first ball contacts the first protrusion of the first side plate and the first groove of the first side surface; The lens driving device according to claim 5 , wherein the second ball contacts the second protrusion of the third side plate and the second groove of the third side surface.

7. a first yoke disposed outside the fixed portion and overlapping the first side plate in a direction perpendicular to the optical axis direction; The lens driving device according to claim 1 , further comprising a second yoke disposed outside the fixed portion and overlapping with the third side plate in a direction perpendicular to the optical axis direction.

8. the first balls include a plurality of first balls, the second balls include a plurality of second balls, the plurality of first balls are arranged in the optical axis direction, The lens driving device according to claim 1 , wherein the plurality of second balls are arranged in the optical axis direction.

9. A fixed portion; a moving part disposed within the fixed part; a drive magnet disposed on the moving part; a coil disposed on the fixed portion so as to correspond to the drive magnet; a ball disposed between the fixed portion and the moving portion, the ball guides the moving part to move in the optical axis direction relative to the fixed part; the fixing portion includes first and second side plates disposed on opposite sides to each other, and third and fourth side plates connecting the first and second side plates and disposed in opposite directions to each other, the moving portion includes first and second side surfaces disposed on opposite sides to each other, and third and fourth side surfaces connecting the first and second side surfaces and disposed in opposite directions to each other, the first to fourth side plates face the first to fourth side surfaces, the drive magnet moves the moving part in the optical axis direction through interaction with the coil, the drive magnet includes a first drive magnet disposed on the first side surface of the moving part and a second drive magnet disposed on the second side surface of the moving part, The balls include a first ball arranged in a first corner region where the first side plate and the third side plate of the fixed part are connected, and a second ball arranged in a second corner region where the second side plate and the fourth side plate of the fixed part are connected.

10. the first side plate includes a protrusion protruding from an inner surface of the first side plate, The lens driving device according to claim 9 , wherein the second side plate includes a protrusion that protrudes from an inner surface of the second side plate.

Images