Camera actuator and camera module comprising the same

Abstract

A camera actuator according to one embodiment includes: a housing; a prism unit arranged inside the housing; a first driving unit arranged inside the housing and controlling tilting of the prism unit; and a second driving unit arranged below the housing and controlling tilting of the housing, wherein the first driving unit includes a first piezoelectric element arranged in an area overlapping with a center of the prism unit in a first direction, the second driving unit includes a second piezoelectric element arranged in an area overlapping with the center of the prism unit in a second direction different from the first direction, the prism unit is tiltable in the second direction by the first driving unit, and the housing is tiltable in the first direction by the second driving unit.

Description

Technical Field

[0001] The embodiments relate to a camera actuator and a camera module. Background Technology

[0002] The camera module captures objects and stores them as images or videos, and the camera module is installed in various devices, such as mobile terminals (such as mobile phones), laptops, drones, and vehicles.

[0003] Typically, the device described above is equipped with a miniature camera module capable of performing autofocus (AF) by automatically adjusting the distance between the image sensor and the lens to align the lens's focal length. Additionally, the camera module can perform zoom functions by increasing or decreasing the magnification of distant objects via a zoom lens.

[0004] Meanwhile, a zoom actuator is used for the zoom function in the camera module. However, when the lens is moved due to the mechanical movement of the actuator, frictional torque is generated, and problems such as reduced driving force, increased power consumption, and degraded control characteristics occur due to this frictional torque.

[0005] In particular, to achieve optimal optical performance, not only must the alignment between multiple lens groups be well-matched, but the alignment between these lens groups and the image sensor must also be well-matched. However, when the center of the spherical surface between lens groups deviates from the optical axis, a tilting phenomenon occurs, which is a phenomenon of lens tilt or misalignment between the central axis of the lens group and the image sensor. Because of the change in viewing angle or defocus, there is a problem of image quality or resolution degradation.

[0006] In addition, in the camera module, when the separation distance in the area where friction is generated is increased to reduce the frictional torque resistance when the lens is moved for zoom function, the following technical problem exists: when zooming or reverse zooming is performed, the lens decentization or lens tilt is aggravated.

[0007] In addition, recent camera modules employ image stabilization (IS) technology to correct or prevent image instability caused by camera movement due to unstable fixtures or user movement.

[0008] Image stabilization (IS) technologies include optical image stabilization (OIS) and image stabilization prevention technologies using image sensors. OIS corrects motion by altering the optical path, while image stabilization prevention technologies use both mechanical and electronic methods to compensate for motion. OIS technology is increasingly being adopted in recent years.

[0009] Simultaneously, the camera module may include a reflective component capable of altering the optical path to achieve OIS functionality, a drive unit, etc. Specifically, the camera module can alter the optical path by controlling the position of the reflective component using a driving force applied from the drive unit. The position of the reflective component can be controlled by using a VCM (voice coil motor) type drive unit, including coils, magnets, etc.

[0010] However, in the above methods, additional support components (such as ball bearings and guide rails) are required to support the reflective components, which results in a large volume of support components, which limits the miniaturization process.

[0011] In addition, the above methods have the following problems: accuracy is affected by noise and synchronization issues generated during the driving process, and the position of the reflective component is difficult to control precisely.

[0012] As a result, the optical characteristics of the camera module may deteriorate, and the following problem exists: the effect of OIS operation is not obvious.

[0013] Therefore, a new camera module is required that can solve the above problems. Summary of the Invention

[0014] Technical issues

[0015] The embodiments provide a camera actuator and a camera module with improved optical performance.

[0016] Additionally, the embodiments provide a camera actuator and a camera module capable of effectively controlling vibrations caused by hand tremors.

[0017] Additionally, the embodiments provide a camera actuator and a camera module that can be implemented in a compact size with a small volume.

[0018] Additionally, the embodiments provide a camera actuator and a camera module with improved autofocus and high-magnification zoom capabilities.

[0019] Additionally, the embodiments provide a camera actuator and a camera module capable of preventing problems such as eccentricity, tilting, and friction that occur when the lens group moves.

[0020] Technical solution

[0021] A camera actuator according to an embodiment includes: an outer casing; a prism unit disposed within the outer casing; a first drive unit disposed within the outer casing and controlling the tilting of the prism unit; and a second drive unit disposed below the outer casing and controlling the tilting of the outer casing, wherein the first drive unit includes a first piezoelectric device disposed in a region overlapping the center of the prism unit in a first direction, wherein the second drive unit includes a second piezoelectric device disposed in a region overlapping the center of the prism unit in a second direction different from the first direction, wherein the prism unit is configured to be tiltable in the second direction by the first drive unit, and wherein the outer casing is configured to be tiltable in the first direction by the second drive unit.

[0022] Additionally, the outer cover includes: a lower portion; a first side portion and a second side portion, the first side portion and the second side portion extending upward on the lower portion and facing each other; and an upper portion, the upper portion being placed on the first side portion and the second side portion and connecting the first side portion and the second side portion; and wherein the first piezoelectric device is placed between the first side portion and the first outer surface of the prism unit.

[0023] In addition, the outer cover further includes a partition wall disposed between the first side and the prism unit, wherein the first piezoelectric device is disposed between the partition wall and the first outer surface.

[0024] Additionally, the first drive unit includes: a first yoke disposed between the first side and the partition wall; and a first magnet disposed between the partition wall and the first outer surface, wherein the first yoke and the first magnet are disposed in a region that does not overlap with the first piezoelectric device in the first direction, and wherein the prism unit is compressed in the direction toward the partition wall by the attraction of the first yoke and the first magnet.

[0025] In addition, the first drive unit further includes: a second yoke disposed between the first side and the partition wall; and a second magnet disposed between the partition wall and the first outer surface, wherein the first piezoelectric device is disposed between the first magnet and the second magnet.

[0026] Additionally, the first magnet includes: a first-first magnet having a first polarity; and a first-second magnet having a second polarity opposite to the first polarity, wherein the first-first magnet is placed on the first-second magnet.

[0027] Additionally, the camera actuator further includes a first sensing unit disposed between the first magnet and the first yoke, wherein the first sensing unit is disposed in a region corresponding to the boundary between the first-first magnet and the first-second magnet.

[0028] Additionally, the camera actuator further includes a base member disposed below the outer casing, wherein the second piezoelectric device is disposed between the outer casing and the base member.

[0029] Additionally, the second drive unit includes: a third yoke disposed on the outer casing; and a third magnet disposed between the outer casing and the base member, wherein the third yoke and the third magnet are disposed in a region that does not overlap with the second piezoelectric device in the second direction, and wherein the outer casing is compressed in the direction toward the base member by the attractive force of the third yoke and the third magnet.

[0030] Additionally, the second drive unit further includes: a fourth yoke disposed on the outer casing and spaced apart from the third yoke; and a fourth magnet disposed between the outer casing and the base member, wherein the second piezoelectric device is disposed between the third magnet and the fourth magnet.

[0031] Additionally, the camera actuator further includes a second sensing unit disposed between the third magnet and the third yoke.

[0032] In addition, the first piezoelectric device is in direct contact with the prism unit, and the second piezoelectric device is in direct contact with the outer casing.

[0033] Additionally, the first drive unit includes a first elastic member for pressing the prism unit in a direction toward the first piezoelectric device.

[0034] Additionally, the second drive unit includes a second elastic member for pressing the outer casing in the direction toward the second piezoelectric device.

[0035] Additionally, the camera actuator further includes a first guide protrusion disposed on one side of the partition wall and having a shape protruding toward the prism unit, wherein the first guide protrusion is disposed in a region that overlaps with the center of the prism unit in the first direction.

[0036] Additionally, the camera actuator further includes a second guide protrusion disposed on the lower portion of the outer casing and having a shape protruding toward the base member, wherein the second guide protrusion is disposed in a region overlapping the center of the prism unit in the second direction.

[0037] Additionally, a camera module according to an embodiment includes a first camera actuator and a second camera actuator, wherein the first camera actuator performs an OIS (Optical Image Stabilizer) function, and the second camera actuator performs an autofocus or zoom function, and the first camera actuator may include the camera actuator.

[0038] Additionally, light incident on the camera module from the outside is incident on the second camera actuator via the first camera actuator.

[0039] Beneficial effects

[0040] The camera actuator and camera module according to the embodiments can have improved optical performance. Specifically, in the camera actuator and camera module according to the embodiments, the drive unit for controlling the position of the prism may include a piezoelectric device, and the position of the prism can be controlled more precisely by the drive unit. Accordingly, this embodiment can more effectively control vibrations caused by hand tremors, thereby providing improved OIS functionality.

[0041] Furthermore, the camera actuator and camera module according to the embodiment can be implemented in a smaller size. Specifically, the drive unit can control the position of the prism through frictional force caused by the mechanical deformation of the piezoelectric device. Accordingly, compared to a VCM-type drive unit including ball bearings, guide rails, etc., the drive unit according to the embodiment can be provided in a smaller size, and friction generated during prism position control can be minimized.

[0042] Furthermore, the camera actuator and camera module according to the embodiments can have improved optical performance. Specifically, in the camera actuator and camera module according to the embodiments, the drive unit for moving the lens group includes a piezoelectric device, and the drive unit is capable of more precise control of the lens group. Additionally, the camera actuator and camera module according to the embodiments can minimize friction occurring when the lens group moves, and can prevent eccentricity and tilting, enabling more precise control of the lens group's position. Accordingly, this embodiment can provide improved autofocus and zoom functions.

[0043] Additionally, the camera module according to the embodiment may include multiple camera actuators, such as OIS and zoom / AF actuators, and each of the multiple camera actuators may include a piezoelectric device as a drive unit. Accordingly, in addition to the drive driver for driving the piezoelectric device, the camera module may omit a separate drive driver, such as a VCM drive driver, thereby simplifying the structure and having a slim shape. Attached Figure Description

[0044] Figure 1 This is an exploded perspective view of the first camera actuator according to an embodiment.

[0045] Figure 2 This is a perspective view of the first housing of the first camera actuator according to an embodiment.

[0046] Figure 3 This is a top view of the first housing of the first camera actuator according to an embodiment.

[0047] Figure 4 This is an exploded perspective view of the prism unit of the first camera actuator according to an embodiment.

[0048] Figure 5 This is a perspective view of the prism unit of the first camera actuator according to an embodiment.

[0049] Figures 6 to 8 The front view, top view, and perspective view of the cover are omitted in the first camera actuator according to the embodiment.

[0050] Figures 9 to 12 This is a view used to explain the arrangement of the first drive unit of the first camera actuator according to an embodiment.

[0051] Figures 13 to 15 This is a view used to explain the second drive unit of the first camera actuator according to an embodiment.

[0052] Figures 16 to 19 This is a view used to explain the arrangement of the second drive unit of the first camera actuator according to an embodiment.

[0053] Figure 20 This is another exploded perspective view of the first camera actuator according to an embodiment.

[0054] Figure 21 It is based on Figure 20 An exploded stereoscopic view of the prism unit of the first camera actuator.

[0055] Figure 22 It is based on Figure 20 A three-dimensional view of the prism unit of the first camera actuator.

[0056] Figure 23 It is based on Figure 20 Front view of the first camera actuator.

[0057] Figure 24 and Figure 25 It is used to explain the basis Figure 20 A view showing the arrangement of the first drive unit of the first camera actuator.

[0058] Figures 26 to 28 It is used to explain the basis Figure 20 A view showing the arrangement of the second drive unit of the first camera actuator.

[0059] Figure 29 This is a perspective view of a camera module according to an embodiment.

[0060] Figure 30 This is a perspective view of a camera module according to an embodiment, with some components omitted.

[0061] Figure 31 This is an exploded perspective view of the second camera actuator according to an embodiment.

[0062] Figure 32 This is a cross-sectional view of the second camera actuator according to an embodiment.

[0063] Figure 33 This is a front view of the second camera actuator according to an embodiment.

[0064] Figure 34 This is a perspective view showing the third and fourth drive units disposed in the first housing of the second camera actuator according to the embodiment.

[0065] Figure 35 This is an exploded perspective view of the third drive unit according to an embodiment.

[0066] Figure 36 This is an exploded perspective view of the fourth drive unit according to an embodiment.

[0067] Figure 37This is a perspective view of a partial structure of the second camera actuator according to an embodiment.

[0068] Figure 38 This is a perspective view of a mobile terminal that uses a camera module according to an embodiment.

[0069] Figure 39 This is a perspective view of a vehicle that utilizes a camera module according to an embodiment. Detailed Implementation

[0070] In the following, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0071] However, the spirit and scope of the invention are not limited to the parts of the described embodiments, and may be implemented in various other forms. Furthermore, within the spirit and scope of the invention, one or more elements of the embodiments may be selectively combined and substituted for use.

[0072] Furthermore, unless clearly defined and described otherwise, the terms (including technical and scientific terms) used in the embodiments of the present invention may be understood to have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains, and terms such as those defined in commonly used dictionaries may be interpreted to have a meaning consistent with their meaning in the context of the relevant art.

[0073] Furthermore, the terminology used in the embodiments of the present invention is for describing embodiments and is not intended to limit the invention. In this specification, the singular form may also include the plural form unless explicitly stated otherwise, and when described as “at least one (or more) of A, B, and C,” it may include at least one of all possible combinations of A, B, and C.

[0074] Furthermore, in describing the elements of embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are used only to distinguish an element from other elements, and these terms are not limited to the nature, magnitude, or order of the elements. Additionally, when an element is described as being “connected,” “linked,” or “attached” to another element, this may include not only the element being directly “connected,” “linked,” or “attached” to the other element, but also the element being “connected,” “linked,” or “attached” through another element between the element and the other element.

[0075] Furthermore, when described as being formed or placed "above" or "below" each element, "above" or "below" can include not only cases where two elements are directly connected to each other, but also cases where one or more additional elements are formed or placed between two elements. Additionally, when expressed as "above" or "below," this can include not only the upward direction based on an element, but also the downward direction based on an element.

[0076] The optical axis direction used below can be defined as the optical axis direction of the lens connected to the camera actuator and camera module, and the vertical direction can be defined as the direction perpendicular to the optical axis.

[0077] The autofocus function used below can be defined as follows: based on the distance of the object, the distance from the image sensor is adjusted by moving the lens in the optical axis direction to automatically focus on the object, thereby enabling the image sensor to obtain a clear image of the object.

[0078] Meanwhile, autofocus can correspond to autofocus (AF). In addition, closed-loop autofocus (CLAF) control can be defined as real-time feedback control of the lens position by sensing the distance between the image sensor and the lens to improve focus adjustment accuracy.

[0079] Furthermore, before describing embodiments of the present invention, the first direction may refer to the x-axis direction shown in the figures, and the second direction may be a direction different from the first direction. For example, the second direction may refer to the y-axis direction shown in the figures, which is perpendicular to the first direction. Moreover, the third direction may be different from the first and second directions. For example, the third direction may refer to the z-axis direction shown in the figures, which is perpendicular to both the first and second directions. Here, the third direction may refer to the optical axis direction.

[0080] In the following description, the construction of the camera module according to this embodiment will be described with reference to the accompanying drawings.

[0081] Figure 1 This is an exploded perspective view of a first camera actuator according to an embodiment. The first camera actuator 1000 may be an optical image stabilizer (OIS) actuator. The first camera actuator 1000 may alter the optical path incident on the camera module 10.

[0082] refer to Figure 1 According to an embodiment, the first camera actuator 1000 may include a cover 100, a first outer cover 200, a first drive unit 301, a second drive unit 302, a prism unit 400, and a base member 500.

[0083] The cover 100 may include a receiving space, and at least one side surface may be open. For example, the cover 100 may have a structure in which multiple side surfaces connected to each other are open. In detail, the cover 100 may have an open structure in which an upper surface through which light incident from the outside passes, a side corresponding to the first camera actuator 1000, and a lower surface opposite to the upper surface are open, and may provide a light movement path for the prism unit 400, which will be described later.

[0084] The cover 100 may include a rigid material. For example, the cover 100 may include a material with predetermined reliability, such as resin, metal, ceramic, etc., and the cover 100 may support the first outer cover 200 placed in the receiving space. For example, the cover 100 may be positioned to surround the first outer cover 200, the prism unit 400, the first drive unit 301 and the second drive unit 302, etc., and may support these components.

[0085] Figure 2 This is a perspective view of the first housing of the first camera actuator according to an embodiment, and Figure 3 This is a top view of the first housing of the first camera actuator according to an embodiment.

[0086] See Figure 2 and Figure 3 The first outer cover 200 may have a structure with multiple open side surfaces. For example, the first outer cover 200 may include a lower portion 210, a first side portion 221, a second side portion 222, and an upper portion 230.

[0087] The lower part 210 has a plate shape and can extend in a first direction (x-axis direction).

[0088] The first side portion 221 and the second side portion 222 can be respectively placed in the edge region of the lower portion 210. The first side portion 221 and the second side portion 222 can extend from the edge of the lower portion 210 in an upward direction (y-axis direction). The first side portion 221 and the second side portion 222 can be positioned facing each other in a first direction. The first side portion 221 and the second side portion 222 can be parallel.

[0089] The upper portion 230 can be placed on the lower portion 210. The upper portion 230 can be placed on the first side portion 221 and the second side portion 222, and can connect the ends of the first side portion 221 and the second side portion 222. The upper portion 230 can be positioned to face the lower portion 210 in a second direction. The upper portion 230 can be parallel to the lower portion 210.

[0090] The upper portion 230 of the first outer cover 200 can be opened. Specifically, the upper portion 230 of the first outer cover 200 may have an open area corresponding to the upper surface of the cover 100. Furthermore, the area of ​​the first outer cover 200 corresponding to one side of the cover 100 (e.g., the area between the first side portion 221 and the second side portion 222) can be opened. Moreover, in the first outer cover 200, the area corresponding to the opposite side to one side of the cover 100 can be opened. Accordingly, the first outer cover 200 can provide a light movement path for the prism unit 400, which will be described later.

[0091] The first outer cover 200 may further include a partition wall 250 disposed on the lower portion 210. The partition wall 250 extends from the lower portion 210 toward the upper portion 230. The partition wall 250 may be disposed between the first side portion 221 and the second side portion 222, and may be parallel to the first side portion 221 and the second side portion 222. Compared to the second side portion 222, the partition wall 250 may be disposed adjacent to the first side portion 221.

[0092] The partition wall 250 may include a first guide protrusion 271. The first guide protrusion 271 may be positioned on the side facing the second side 222. The first guide protrusion 271 may have a shape that protrudes from one side of the partition wall 250 toward the second side 222. The first guide protrusion 271 may be positioned in a region corresponding to the first piezoelectric device 310, which will be described later. The first guide protrusion 271 may be positioned in a region that overlaps with the center of the prism unit 400 in a first direction (x-axis direction). The first guide protrusion 271 may be positioned in a region that overlaps with the center of the prism 410 in a first direction.

[0093] The first outer cover 200 may include multiple receiving spaces. For example, the first outer cover 200 may include a first receiving space 205 and a second receiving space 255 separated by the partition wall 250.

[0094] The first receiving space 205 can be placed between the partition wall 250 and the second side portion 222. The prism unit 400 can be placed in the first receiving space 205. Additionally, the second receiving space 255 can be placed between the partition wall 250 and the first side portion 221. A portion of the structure of the first drive unit 301 can be placed in the second receiving space 255.

[0095] Figure 4 This is an exploded perspective view of the prism unit of the first camera actuator according to an embodiment, and Figure 5This is a perspective view of the prism unit of the first camera actuator according to an embodiment.

[0096] refer to Figure 4 and Figure 5 The prism unit 400 may include a prism 410 and a prism mover 430 placed on the prism 410.

[0097] The prism 410 may be a right-angle prism. The prism 410 can change the direction of light incident from the outside. That is, the prism 410 can change the direction of light incident from the outside onto the first camera actuator 1000 toward the second camera actuator 2000, which will be described later.

[0098] The prism mover 430 can be placed on the prism 410. The prism mover 430 can be positioned to surround the prism 410. At least one side of the prism mover 430 can be open and may include a receiving space. Specifically, the prism mover 430 can have a structure in which multiple outer surfaces connected to each other are open. For example, the prism mover 430 can have a structure in which the outer surface corresponding to the prism 410 is open and may include a receiving space defined as a first space 435. The first space 435 can have a shape corresponding to the prism 410. The prism 410 can be coupled to the prism mover 430 in the first space 435.

[0099] The prism unit 400 may include multiple outer surfaces. For example, the prism mover 430 may include multiple outer surfaces. The prism mover 430 may include a first outer surface 430S1 facing the partition wall 250 and a second outer surface 430S2 facing the second side portion 222. In addition, the prism mover 430 may include: a third outer surface 430S3 facing the lower portion 210; and a fourth outer surface 430S4 disposed between the first outer surface and the third outer surfaces 430S1, 430S2 and 430S3, and connecting the first outer surface to the third outer surfaces 430S1, 430S2 and 430S3.

[0100] Furthermore, the prism mover 430 may include a first recess 430R1. The first recess 430R1 may be placed on the first outer surface 430S1. The first recess 430R1 may be placed in a region that overlaps with the center of the prism unit 400 in a first direction (x-axis direction). The first recess 430R1 may have a groove shape in the direction from the first outer surface 430S1 to the second outer surface 430S2.

[0101] The first recess 430R1 can be placed in the region corresponding to the first guide protrusion 271. Specifically, the first recess 430R1 can be placed in the region overlapping with the first guide protrusion 271 in a first direction. The first recess 430R1 can have a shape corresponding to the shape of the first guide protrusion 271 and a depth corresponding to the depth of the first guide protrusion 271. The first recess 430R1 can provide space for the first guide protrusion 271 to be inserted therein. The prism unit 400 can be tilted in the vertical direction (y-axis direction) using the first guide protrusion 271 as a rotation axis.

[0102] Figures 6 to 8 The front view, top view, and perspective view of the cover are omitted in the first camera actuator according to the embodiment.

[0103] refer to Figures 6 to 8 The first drive unit 301 can be placed within the first outer casing 200. The first drive unit 301 can be positioned adjacent to the first side portion 221. For example, the first drive unit 301 can be placed between the first side portion 221 and the prism unit 400.

[0104] The first driving unit 301 may include a first piezoelectric device 310, a first yoke 331, and a first magnet 351.

[0105] The first piezoelectric device 310 can be placed between the first side portion 221 and the prism unit 430. The first piezoelectric device 310 can be placed in the first receiving space 205. The first piezoelectric device 310 can be placed between the first outer surface 430S1 of the prism unit 400 and the partition wall 250. The first piezoelectric device 310 can be placed on the region corresponding to the first guide protrusion 271 and the first recess 430R1. The first piezoelectric device 310 can be placed in the region corresponding to the center of the prism unit 400 in a first direction. The first piezoelectric device 310 can be positioned to directly contact the first outer surface 430S1.

[0106] The first piezoelectric device 310 may include a piezoelectric device. The first piezoelectric device 310 may include a ceramic material. For example, the first piezoelectric device 310 may include at least one of the following: ZnO, AlN, LiNbO4, lead antimony stannate, lead magnesium tantalate, lead nickel tantalate, titanate, tungstate, zirconate, or lead zirconate titanate [Pb(ZrxTi1-x)O3(PZT)], lead lanthanum zirconate titanate (PLZT), lead niobate zirconate titanate (PNZT), BaTiO3, SrTiO3, lead magnesium niobate, lead nickel niobate, lead manganese niobate, lead zinc niobate, lead, barium, and bismuth, including lead titanate and strontium niobates.

[0107] The first piezoelectric device 310 can control the tilt of the prism unit 400. The first piezoelectric device 310 may have a cylindrical shape. The first piezoelectric device 310 can be mechanically deformed by the applied electric current. For example, the upper surface of the first piezoelectric device 310 facing the first outer surface 430S1 can be deformed into a wave shape by the applied electric current.

[0108] In detail, the first piezoelectric device 310 may include a plurality of first piezoelectric elements (not shown). The plurality of first piezoelectric elements may be arranged in a first direction from the center of the first piezoelectric device 310 along a concentric circle.

[0109] The plurality of first piezoelectric units may include a plurality of first-first piezoelectric units spaced apart from each other and a first-second piezoelectric unit disposed between the plurality of first-first piezoelectric units. In this case, due to the difference in the electric current applied to each of the plurality of first-first piezoelectric units and the plurality of first-second piezoelectric units, the upper surface of the first piezoelectric device 310 can be formed into a continuous wave shape, and due to this deformation, a frictional force can be generated between the first piezoelectric device 310 and the first outer surface 430S1. That is, through the frictional force between the first piezoelectric device 310 and the first outer surface 430S1, the prism unit 400 can tilt in the vertical direction (y-axis direction).

[0110] Additionally, the first piezoelectric device 310 may further include a first guide hole 311. The first guide hole 311 may be positioned in the region corresponding to the first guide protrusion 271 and the first recess 430R1. The first guide hole 311 may be a through hole in a first direction. When the first piezoelectric device 310 includes the first guide hole 311, the first piezoelectric device 310 may have a donut shape.

[0111] For the insertion of the first guide protrusion 271, the first guide hole 311 may have a shape corresponding to the first guide protrusion 271. The first guide protrusion 271 may be inserted into the first recess 430R1 through the first guide hole 311.

[0112] Accordingly, the first piezoelectric device 310 and the prism unit 400 may have positions defined by the first guide protrusion 271. In addition, the first guide protrusion 271 and the first guide hole 311 prevent the first piezoelectric device 310 and the prism unit 400 from separating from the defined rotation axis during the tilting of the prism unit 400 along the vertical direction (y-axis direction).

[0113] The first yoke 331 can be placed in the second receiving space 255. The first yoke 331 can be placed between the first side portion 221 and the partition wall 250. The first yoke 331 can be placed on the opposite side of the partition wall 250.

[0114] The first yoke 331 can be placed in a region that does not correspond to the first piezoelectric device 310. For example, the first yoke 331 can be placed in a region that does not overlap with the first piezoelectric device 310 in a first direction.

[0115] The first magnet 351 can be placed in the first receiving space 205. The first magnet 351 can be placed between the partition wall 250 and the prism unit 400. The first magnet 351 can be placed between the partition wall 250 and the first outer surface 430S1. The first magnet 351 can be fixed to the first outer surface 430S1.

[0116] The first magnet 351 may be spaced apart from the first piezoelectric device 310. The first magnet 351 may be placed in a region that does not correspond to the first piezoelectric device 310. For example, the first magnet 351 may be placed in a region that does not overlap with the first piezoelectric device 310 in a first direction. Furthermore, the first magnet 351 may be placed in a region corresponding to the first yoke 331. Specifically, the first magnet 351 may be placed in a region that overlaps with the first yoke 331 in a first direction.

[0117] The first yoke 331 and the first magnet 351 can arrange the prism unit 400 at a predetermined position. For example, a magnetic attraction can be generated between the first yoke 331 and the first magnet 351. The prism unit 400 can be compressed in the direction toward the partition wall 250 by this magnetic attraction. Accordingly, the prism unit 400 can be positioned at a location overlapping the center of the first piezoelectric device 310 in a first direction without the need for a separate fixing member.

[0118] In addition, the first driving unit 301 may further include a second yoke 332 and a second magnet 352.

[0119] The second yoke 332 can be placed in the second receiving space 255. The second yoke 332 can be placed between the first side portion 221 and the partition wall 250. The second yoke 332 can be placed on the other side of the partition wall 250. The second yoke 332 can be spaced apart from the first yoke 331. For example, the second yoke 332 can be spaced apart from the first yoke 331 along the optical axis (z-axis direction).

[0120] Furthermore, the second yoke 332 can be positioned in a region that does not correspond to the first piezoelectric device 310. For example, the second yoke 332 can be positioned in a region that does not overlap with the first piezoelectric device 310 in the first direction. The first piezoelectric device 310 can be positioned between the first yoke 331 and the second yoke 332.

[0121] The second magnet 352 can be placed in the first receiving space 205. The second magnet 352 can be placed between the partition wall 250 and the prism unit 400. The second magnet 352 can be placed between the partition wall 250 and the first outer surface 430S1. The second magnet 352 can be fixed to the first outer surface 430S1. The second magnet 352 can be spaced apart from the first magnet 351. For example, the second magnet 352 can be spaced apart from the first magnet 351 along the optical axis (z-axis direction).

[0122] Furthermore, the second magnet 352 can be spaced apart from the first piezoelectric device 310. The second magnet 352 can be placed in a region that does not correspond to the first piezoelectric device 310. For example, the second magnet 352 can be placed in a region that does not overlap with the first piezoelectric device 310 in a first direction. The first piezoelectric device 310 can be placed between the first magnet 351 and the second magnet 352. Moreover, the second magnet 352 can be placed in a region corresponding to the second yoke 332. Specifically, the second magnet 352 can be placed in a region that overlaps with the second yoke 332 in a first direction.

[0123] The second yoke 332 and the second magnet 352 can arrange the prism unit 400 at a predetermined position. For example, a magnetic attraction can be generated between the second yoke 332 and the second magnet 352. The prism unit 400 can be compressed in the direction toward the partition wall 250 by this magnetic attraction. Accordingly, the prism unit 400 can be positioned at a location overlapping the center of the first piezoelectric device 310 in a first direction without the need for a separate fixing member.

[0124] That is, the first camera actuator 1000 may include a first yoke 331 and a second yoke 332, as well as a first magnet 351 and a second magnet 352, placed in the lateral direction of the prism unit 400. In this case, each of the first yoke 331 and the second yoke 332, and the first magnet 351 and the second magnet 352, may be placed side-by-side on the optical axis (z-axis direction) and may be placed in the region surrounding the first piezoelectric device 310. Accordingly, the prism unit 400 may be placed more stably in the first housing 200 and may be tilted more stably by the driving force of the first piezoelectric device 310. Accordingly, the first camera actuator 1000 according to this embodiment may have improved reliability and optical characteristics.

[0125] The first driving unit 301 may include a first sensing unit 371. The first sensing unit 371 may be placed on one side of the partition wall 250. The first sensing unit 371 may be placed in a region corresponding to the first magnet 351 in a first direction. The first sensing unit 371 may include a Hall sensor. The first sensing unit 371 can sense the position of the first magnet 351. That is, the first sensing unit 371 can sense the position of the prism unit 400.

[0126] Figure 9 This is a view used to explain the arrangement of the first drive unit of the first camera actuator according to an embodiment.

[0127] refer to Figure 9 The first yoke 331 may have a shape extending in a second direction (y-axis direction). The length of the first yoke 331 in the second direction may be greater than the length in the first direction.

[0128] The first magnet 351 can be placed in the region corresponding to the first yoke 331 in the first direction. The first magnet 351 can have a shape extending in the second direction (y-axis direction). The length of the first magnet 351 in the second direction can be greater than its length in the first direction.

[0129] The first magnet 351 may include a first magnet 351a having a first polarity and a first magnet 351b having a second polarity opposite to the first polarity. The first magnet 351a and the first magnet 351b may be placed side by side in a third-direction orientation. The first magnet 351b may be placed closer to the first piezoelectric device 310 than the first magnet 351a.

[0130] Additionally, the second yoke 332 may be spaced apart from the first yoke 331 in a third direction. The second yoke 332 may have a shape extending in a second direction (y-axis direction). The length of the second yoke 332 in the second direction may be greater than its length in the first direction.

[0131] The second magnet 352 can be placed in the region corresponding to the second yoke 332 in the first direction. The second magnet 352 can be spaced apart from the first magnet 351 in a third direction. The second magnet 352 can have a shape extending in a second direction (y-axis direction). The length of the second magnet 352 in the second direction can be greater than its length in the first direction.

[0132] The second magnet 352 may include a second-first magnet 352a having a first polarity and a second-second magnet 352b having a second polarity. The second-first magnet 352a and the second-second magnet 352b may be placed side by side in a third-direction orientation. The second-first magnet 352a may be placed closer to the first piezoelectric device 310 than the second-second magnet 352b.

[0133] The first sensing unit 371 can be placed in the region between the first magnet 351a and the first magnet 351b. For example, the first sensing unit 371 can be placed in a region that overlaps with the boundary between the first magnet 351a and the first magnet 351b in a first direction.

[0134] Furthermore, although not shown in the accompanying drawings, multiple magnets can be further placed between the prism unit 400 and the outer casing 200. For example, magnets with the same polarity can be placed on the second outer surface 430S2 of the outer casing 200 and the second side portion 222 facing the second outer surface 430S2. Accordingly, a magnetic repulsive force can be generated between the multiple magnets, and the prism unit 400 can be compressed in the direction toward the partition wall 250 by this repulsive force. Accordingly, the prism unit 400 can have improved positional reliability within the outer casing 200.

[0135] in addition, Figures 10 to 12This is a view used to explain other arrangement relationships of the first drive unit according to the embodiment. In use Figures 10 to 12 In the description, descriptions of those parts that are the same as or similar to those of the first camera actuator described above are omitted, and the same reference numerals are assigned to the same and similar parts.

[0136] refer to Figure 10 The first magnet 351 can be placed in the region corresponding to the first yoke 331 in the first direction. The first magnet 351 can have a shape extending in the second direction (y-axis direction). The length of the first magnet 351 in the second direction can be greater than its length in the first direction.

[0137] The first magnet 351 may include a first magnet 351a having a first polarity and a first magnet 351b having a second polarity. The first magnet 351a and the first magnet 351b may be arranged in parallel in a second direction (y-axis direction). That is, the first magnet 351b may be placed below the first magnet 351a and may be adjacent to the lower part 210 of the first outer cover 200.

[0138] Additionally, the second magnet 352 can be placed in the region corresponding to the second yoke 332 in the first direction. The second magnet 352 can be spaced apart from the first magnet 351 in a third direction. The second magnet 352 can have a shape extending in a second direction (y-axis direction). The length of the second magnet 352 in the second direction can be greater than its length in the first direction.

[0139] The second magnet 352 may include a second-first magnet 352a having a first polarity and a second-second magnet 352b having a second polarity. The second-first magnet 352a and the second-second magnet 352b may be arranged side by side in a second direction. That is, the second-second magnet 352b may be placed below the second-first magnet 352a and may be adjacent to the lower portion 210 of the first outer cover 200.

[0140] The first sensing unit 371 can be placed in the region between the first magnet 351a and the second magnet 351b. For example, the first sensing unit 371 can be placed in a region that overlaps with the boundary between the first magnet 351a and the second magnet 351b in a first direction. The boundary between the first magnet 351a and the second magnet 351b can overlap with the center of the first magnet 351 in a second direction (y-axis direction). That is, the first sensing unit 371 can be placed in a region that overlaps with the center of the first magnet 351 in the first direction.

[0141] That is, the first sensing unit 371 can be placed on the region overlapping with the center of the first magnet 351. Accordingly, when the prism unit 400 is tilted by the first driving unit 301, the first sensing unit 371 can effectively sense the amount of rotation of the first magnet 351, thereby enabling more accurate position sensing.

[0142] refer to Figure 11 The first driving unit 301 may omit the first yoke 331 and the second yoke 332. The first driving unit 301 may include a fifth magnet 355 and a sixth magnet 356 instead of the first yoke 331 and the second yoke 332.

[0143] The fifth magnet 355 can be placed in the second receiving space 255. The fifth magnet 355 can be placed between the first side portion 221 and the partition wall 250. The fifth magnet 355 can be placed on the other side of the partition wall 250. The fifth magnet 355 can be placed in a region that does not correspond to the first piezoelectric device 310. For example, the fifth magnet 355 can be placed in a region that does not overlap with the first piezoelectric device 310 in a first direction.

[0144] The fifth magnet 355 can be placed in the region corresponding to the first magnet 351 in the first direction. The fifth magnet 355 can have a shape extending in the second direction (y-axis direction). The length of the fifth magnet 355 in the second direction can be greater than its length in the first direction.

[0145] The fifth magnet 355 may include a fifth-first magnet 355a having a second polarity and a fifth-second magnet 355b having a first polarity. The fifth-first magnet 355a and the fifth-second magnet 355b may be placed side-by-side in a third direction. The fifth-first magnet 355a may be placed in a region overlapping with the first-first magnet 351a in a first direction, and the fifth-second magnet 355b may be placed in a region overlapping with the first-second magnet 351b in a first direction.

[0146] The first magnet 351 and the fifth magnet 355 can arrange the prism unit 400 at a predetermined position. For example, magnetic attraction can be generated between the first magnet 351a and the fifth magnet 355a and between the first magnet 351b and the fifth magnet 355b, and the prism unit 400 can be compressed in the direction toward the partition wall by this magnetic attraction. Accordingly, the prism unit 400 can be placed at a position overlapping the center of the first piezoelectric device 310 in a first direction without the need for a separate fixing member.

[0147] Additionally, a sixth magnet 356 can be placed in the second receiving space 255. The sixth magnet 356 can be placed between the first side portion 221 and the partition wall 250. The sixth magnet 356 can be placed on the other side of the partition wall 250. The sixth magnet 356 can be spaced apart from the fifth magnet 355. For example, the sixth magnet 356 can be spaced apart from the fifth magnet 355 along the optical axis (z-axis direction). Moreover, the sixth magnet 356 can be placed in a region that does not correspond to the first piezoelectric device 310. For example, the sixth magnet 356 can be placed in a region that does not overlap with the first piezoelectric device 310 in a first direction. The first piezoelectric device 310 can be placed between the fifth magnet 355 and the sixth magnet 356.

[0148] The sixth magnet 356 can be placed in the region corresponding to the second magnet 352 in the first direction. The sixth magnet 356 can have a shape extending in the second direction (y-axis direction). The length of the sixth magnet 356 in the second direction can be greater than its length in the first direction.

[0149] The sixth magnet 356 may include a sixth-first magnet 356a having a second polarity and a sixth-second magnet 356b having a first polarity. The sixth-first magnet 356a and the sixth-second magnet 356b may be placed side-by-side in a third direction. The sixth-first magnet 356a may be placed in a region overlapping with the second-first magnet 352a in a first direction, and the sixth-second magnet 356b may be placed in a region overlapping with the second-second magnet 352b in a first direction.

[0150] The second magnet 352 and the sixth magnet 356 can arrange the prism unit 400 at a predetermined position. For example, a magnetic attraction can be generated between the second-first magnet 352a and the sixth-first magnet 356a, and between the second-second magnet 352b and the sixth-second magnet 356b, and the prism unit 400 can be compressed in the direction toward the partition wall by this magnetic attraction. Accordingly, the prism unit 400 can be positioned at a location overlapping the center of the first piezoelectric device 310 in a first direction without the need for a separate fixing member.

[0151] The first sensing unit 371 can be placed in the region between the first magnet 351a and the second magnet 351b. For example, the first sensing unit 371 can be placed in a region that overlaps with the boundary between the first magnet 351a and the second magnet 351b in a first direction.

[0152] That is, the first camera actuator 1000 may include a plurality of magnets 351, 352, 355, and 356 disposed in the lateral direction of the prism unit 400. In this case, the plurality of magnets 351, 352, 355, and 356 may be disposed in the region surrounding the first piezoelectric device 310. Accordingly, the prism unit 400 may be disposed more stably in the first outer casing 200 and may be tilted more stably by the driving force of the first piezoelectric device 310.

[0153] Moreover, reference Figure 12 The first magnet 351 may include a first magnet 351a having a first polarity and a first magnet 351b having a second polarity. The first magnet 351a and the first magnet 351b may be arranged in parallel in a second direction (y-axis direction). That is, the first magnet 351b may be placed below the first magnet 351a and may be adjacent to the lower part 210 of the first outer cover 200.

[0154] Furthermore, the second magnet 352 may include a second-first magnet 352a having a first polarity and a second-second magnet 352b having a second polarity. The second-first magnet 352a and the second-second magnet 352b may be arranged side by side in a second direction. That is, the second-second magnet 352b may be placed below the second-first magnet 352a and may be adjacent to the lower portion 210 of the first outer cover 200.

[0155] Furthermore, the fifth magnet 355 may include a fifth-first magnet 355a having a second polarity and a fifth-second magnet 355b having a first polarity. The fifth-first magnet 355a and the fifth-second magnet 355b may be arranged side-by-side in the second direction. That is, the fifth-second magnet 355b may be placed below the fifth-first magnet 355a and may be adjacent to the lower portion 210 of the first outer cover 200. Additionally, the fifth-first magnet 355a may be placed in the region overlapping with the first-first magnet 351a in the first direction, and the fifth-second magnet 355b may be placed in the region overlapping with the first-second magnet 351b in the first direction.

[0156] Furthermore, the sixth magnet 356 may include a sixth-first magnet 356a having a second polarity and a sixth-second magnet 356b having a first polarity. The sixth-first magnet 356a and the sixth-second magnet 356b may be arranged side-by-side in the second direction. That is, the sixth-second magnet 356b may be placed below the sixth-first magnet 356a and may be adjacent to the lower portion 210 of the first outer cover 200. Additionally, the sixth-first magnet 356a may be placed in the region overlapping with the second-first magnet 352a in the first direction, and the sixth-second magnet 356b may be placed in the region overlapping with the second-second magnet 352b in the first direction.

[0157] The first sensing unit 371 can be placed in the region between the first magnet 351a and the second magnet 351b. For example, the first sensing unit 371 can be placed in a region that overlaps with the boundary between the first magnet 351a and the second magnet 351b in a first direction. The boundary between the first magnet 351a and the second magnet 351b can overlap with the center of the first magnet 351 in a second direction (y-axis direction).

[0158] That is, the first sensing unit 371 can be placed on the region overlapping with the center of the first magnet 351. Accordingly, when the prism unit 400 is tilted by the first driving unit 301, the first sensing unit 371 can effectively sense the amount of rotation of the first magnet 351, thereby enabling more accurate position sensing.

[0159] Figures 13 to 15 This is a view used to explain the second drive unit of the first camera actuator according to an embodiment.

[0160] See Figures 13 to 15 The base member 500 can be placed below the first outer cover 200. The second drive unit 302 can be placed on the base member 500. The base member 500 can be positioned facing the lower portion 210 of the first outer cover 200. The base member 500 has a plate shape and can support a portion of the second drive unit 302.

[0161] The second drive unit 302 may include a second piezoelectric device 320, a third yoke 333 and a third magnet 353.

[0162] The second piezoelectric device 320 can be placed on the base member 500. The second piezoelectric device 320 can be placed between the base member 500 and the first outer cover 200. Specifically, the second piezoelectric device 320 can be placed between the upper surface of the base member 500 and the lower portion 210 of the first outer cover 200. The second piezoelectric device 320 can be placed in a region corresponding to the center of the prism unit 400 in the second direction (y-axis direction). Specifically, the second piezoelectric device 320 can be placed in a region overlapping with the center of the prism 410 in the second direction. The second piezoelectric device 320 can directly contact the outer cover 200.

[0163] The second piezoelectric device 320 may include a piezoelectric device. The second piezoelectric device 320 may include a ceramic material. For example, the second piezoelectric device 320 may include at least one of the following: ZnO, AlN, LiNbO4, lead antimony stannate, lead magnesium tantalate, lead nickel tantalate, titanate, tungstate, zirconate, or lead zirconate titanate [Pb(ZrxTi1-x)O3(PZT)], lead lanthanum zirconate titanate (PLZT), lead niobate zirconate titanate (PNZT), BaTiO3, SrTiO3, lead magnesium niobate, lead nickel niobate, lead manganese niobate, lead zinc niobate, lead, barium, and bismuth, including lead titanate and strontium niobates.

[0164] The second piezoelectric device 320 can control the tilt of the outer casing 200. The second piezoelectric device 320 can have a cylindrical shape. The second piezoelectric device 320 can cause mechanical deformation by applying electricity. For example, the upper surface of the second piezoelectric device 320 facing the lower part 210 of the first outer casing 200 can be deformed into a wave shape by applying electricity.

[0165] In detail, the second piezoelectric device 320 may include a plurality of second piezoelectric elements (not shown). The plurality of second piezoelectric elements may be arranged in a second direction from the center of the second piezoelectric device 320 along a concentric circle.

[0166] The plurality of second piezoelectric elements may include a plurality of second-first piezoelectric elements spaced apart from each other and second-second piezoelectric elements disposed between the plurality of second-first piezoelectric elements. In this case, by the difference in the electrical current applied to each of the plurality of second-first piezoelectric elements and the plurality of second-second piezoelectric elements, the upper surface of the second piezoelectric device 320 can be deformed into a continuous wave shape, and due to this deformation, a frictional force can be generated between the second piezoelectric device 320 and the lower portion 210 of the first outer casing 200. That is, through the frictional force between the second piezoelectric device 320 and the lower portion 210, the first outer casing 200 can tilt in the left-right direction (x-axis direction).

[0167] Additionally, the second piezoelectric device 320 may further include a second guide hole 321. For example, the lower portion 210 of the first outer casing 200 may include a second guide protrusion 272 projecting toward the base member 500. In this case, the second guide protrusion 272 may be positioned in a region overlapping with the center of the prism unit 400 in a second direction (y-axis direction). Specifically, the second guide protrusion 272 may be positioned in a region overlapping with the center of the prism 410 in a second direction. The second guide hole 321 may be positioned in a region corresponding to the second guide protrusion 272. The second guide hole 321 may be a through hole or a groove in the second direction. When the second piezoelectric device 320 includes the second guide hole 321, the second piezoelectric device 320 may have a donut shape.

[0168] The second guide hole 321 may have a shape corresponding to the shape of the second guide protrusion 272, and some or all of the second guide protrusion 272 may be inserted into the second guide hole 321.

[0169] Accordingly, the second piezoelectric device 320 may have a position set by the second guide protrusion 272. In addition, the second guide protrusion 272 and the second guide hole 321 can prevent the second piezoelectric device 320 from separating from the set rotation axis during the tilting of the first outer cover 200 in the left-right direction (x-axis direction).

[0170] The third yoke 333 can be placed on the first outer cover 200. The third yoke 333 can be placed in the second receiving space 255. The third yoke 333 can be placed on the lower part 210.

[0171] Furthermore, the third yoke 333 can be placed in a region that does not correspond to the second piezoelectric device 320. For example, the third yoke 333 can be placed in a region that does not overlap with the second piezoelectric device 320 in the second direction.

[0172] The third magnet 353 can be placed below the first outer cover 200. The third magnet 353 can be placed between the first outer cover 200 and the base member 500. The third magnet 353 can be fixed to the upper surface of the base member 500.

[0173] The third magnet 353 may be spaced apart from the second piezoelectric device 320. The third magnet 353 may be placed in a region that does not correspond to the second piezoelectric device 320. The third magnet 353 may be placed in a region that does not overlap with the second piezoelectric device 320 in the second direction. Furthermore, the third magnet 353 may be placed in a region corresponding to the third yoke 333. Specifically, the third magnet 353 may be placed in a region that overlaps with the third yoke 333 in the second direction.

[0174] The third yoke 333 and the third magnet 353 can position the first outer cover 200 at a predetermined location. For example, a magnetic attraction can be generated between the third yoke 333 and the third magnet 353. The first outer cover 200 can be compressed toward the base member 500 by this magnetic attraction. Accordingly, the first outer cover 200 can be positioned in a second direction overlapping the center of the second piezoelectric device 320 without the need for a separate fixing member.

[0175] Furthermore, the third yoke 333 and the third magnet 353 can be spaced apart from the first drive unit 301. Specifically, the third yoke 333 and the third magnet 353 can be positioned in a region in the second direction (y-axis direction) that does not overlap with the first yoke 331 and the second yoke 332, or the first magnet 351 and the second magnet 352. Accordingly, when the first drive unit 301 is driven or the second drive unit 302 is driven, it is possible to prevent the driving force from being altered by other drive units, for example, due to interference from the yokes and magnets of other drive units.

[0176] In addition, the second drive unit 302 may further include a fourth yoke 334 and a fourth magnet 354.

[0177] The fourth yoke 334 can be placed on the first outer casing 200. The fourth yoke 334 can be placed in the second receiving space 255. The fourth yoke 334 can be placed on the lower portion 210. The fourth yoke 334 can be spaced apart from the third yoke 333. For example, the fourth yoke 334 can be spaced apart from the third yoke 333 along the optical axis (z-axis direction). The fourth yoke 334 can be positioned closer to the second camera actuator 2000, which will be described later, than the third yoke 333.

[0178] Furthermore, the fourth yoke 334 can be positioned in a region that does not correspond to the second piezoelectric device 320. For example, the fourth yoke 334 can be positioned in a region that does not overlap with the second piezoelectric device 320 in the second direction. The second piezoelectric device 320 can be positioned between the third yoke 333 and the fourth yoke 334.

[0179] The fourth magnet 354 can be positioned below the first outer cover 200. The fourth magnet 354 can be positioned between the first outer cover 200 and the base member 500. The fourth magnet 354 can be fixed to the upper surface of the base member 500. The fourth magnet 354 can be spaced apart from the third magnet 353. For example, the fourth magnet 354 can be spaced apart from the third magnet 353 along the optical axis (z-axis direction). The fourth magnet 354 can be positioned closer to the second camera actuator 2000, which will be described later, than the third magnet 353.

[0180] The fourth magnet 354 may be spaced apart from the second piezoelectric device 320. The fourth magnet 354 may be placed in a region that does not correspond to the second piezoelectric device 320. The fourth magnet 354 may be placed in a region that does not overlap with the second piezoelectric device 320 in the second direction. Furthermore, the fourth magnet 354 may be placed in a region corresponding to the fourth yoke 334. Specifically, the fourth magnet 354 may be placed in a region that overlaps with the fourth yoke 334 in the second direction.

[0181] The fourth yoke 334 and the fourth magnet 354 can position the first outer cover 200 at a predetermined location. For example, a magnetic attraction can be generated between the fourth yoke 334 and the fourth magnet 354. The first outer cover 200 can be compressed towards the base member 500 by this magnetic attraction. Accordingly, the first outer cover 200 can be positioned in a second direction overlapping the center of the second piezoelectric device 320 without the need for a separate fixing member.

[0182] Furthermore, the fourth yoke 334 and the fourth magnet 354 can be spaced apart from the first drive unit 301. Specifically, the fourth yoke 334 and the fourth magnet 354 can be positioned in a region in the second direction (y-axis direction) that does not overlap with the first yoke 331 and the second yoke 332, or the first magnet 351 and the second magnet 352. Accordingly, when the first drive unit 301 is driven or the second drive unit 302 is driven, it is possible to prevent the driving force from being altered by other drive units, for example, due to interference from the yokes and magnets of other drive units.

[0183] That is, the first camera actuator 1000 may include a third yoke 333 and a fourth yoke 334, as well as a third magnet 353 and a fourth magnet 354, disposed on the first outer casing 200 and the base member 500. In this case, each of the third yoke 333 and the fourth yoke 334, and the third magnet 353 and the fourth magnet 354, may be arranged side-by-side on the optical axis (z-axis direction) and may be positioned in the region surrounding the second piezoelectric device 320. Accordingly, the first outer casing 200 may be more stably placed on the base member 500 and more stably tilted by the driving force of the second piezoelectric device 320. Furthermore, the first camera actuator 1000 according to this embodiment may have improved reliability and optical characteristics.

[0184] The second driving unit 302 may include a second sensing unit 372. The second sensing unit 372 may be disposed on one side of the partition wall 250. The second sensing unit 372 may be disposed in a region corresponding to at least one of the third magnet 353 and the fourth magnet 354 in a second direction. The second sensing unit 372 may include a Hall sensor. For example, the second sensing unit 372 may sense the position of the third magnet 353. That is, the second sensing unit 372 may sense the position of the first outer casing 200.

[0185] Figure 16 This is a view used to explain the arrangement of the second drive unit of the first camera actuator according to the embodiment.

[0186] refer to Figure 16 The third yoke 333 may have a shape extending in a first direction (x-axis direction). The length of the third yoke 333 in the first direction may be greater than its length in the third direction (z-axis direction).

[0187] The third magnet 353 can be placed in the region corresponding to the third yoke 333 in the second direction. The third magnet 353 can have a shape extending in the first direction (y-axis direction). The length of the third magnet 353 in the first direction can be greater than its length in the third direction.

[0188] The third magnet 353 may include a third-first magnet 353a having a first polarity and a third-second magnet 353b having a second polarity. The third-first magnet 353a and the third-second magnet 353b may be placed side by side in a third-direction orientation. The third-second magnet 353b may be placed closer to the second piezoelectric device 320 than the third-first magnet 353a.

[0189] Furthermore, the fourth yoke 334 may be spaced apart from the third yoke 333 in a third direction. The fourth yoke 334 may have a shape extending in a first direction (x-axis direction). The length of the fourth yoke 334 in the first direction may be greater than its length in the third direction.

[0190] The fourth magnet 354 can be placed in the region corresponding to the fourth yoke 334 in the second direction. The fourth magnet 354 can be spaced apart from the third magnet 353 in the third direction. The fourth magnet 354 can have a shape extending in the first direction (x-axis direction). The length of the fourth magnet 354 in the first direction can be greater than its length in the third direction.

[0191] The fourth magnet 354 may include a fourth-first magnet 354a having a first polarity and a fourth-second magnet 354b having a second polarity. The fourth-first magnet 354a and the fourth-second magnet 354b may be placed side by side in a third-direction orientation. The fourth-first magnet 354a may be placed closer to the second piezoelectric device 320 than the fourth-second magnet 354b.

[0192] The second sensing unit 372 can be placed in the region between the third-first magnet 353a and the third-second magnet 353b. For example, the second sensing unit 372 can be placed in the region that overlaps with the boundary between the third-first magnet 353a and the third-second magnet 353b in the second direction.

[0193] Figures 17 to 19 This is a view used to explain other arrangement relationships of the second drive unit according to the embodiment. In use Figures 17 to 19 In the description, descriptions of those parts that are the same as or similar to those of the first camera actuator described above are omitted, and the same reference numerals are assigned to the same and similar parts.

[0194] refer to Figure 17 The third magnet 353 can be placed in the region corresponding to the third yoke 333 in the second direction. The third magnet 353 can have a shape extending in the first direction (y-axis direction). The length of the third magnet 353 in the first direction can be greater than its length in the third direction.

[0195] The third magnet 353 may include a third-first magnet 353a having a first polarity and a third-second magnet 353b having a second polarity. The third-first magnet 353a and the third-second magnet 353b may be arranged parallel to each other in a first direction (x-axis direction). That is, the third-first magnet 353a and the third-second magnet 353b may be positioned at the same distance from the second piezoelectric device 320.

[0196] Furthermore, the fourth magnet 354 can be placed in the region corresponding to the fourth yoke 334 in the second direction. The fourth magnet 354 can be spaced apart from the third magnet 353 in the third direction. The fourth magnet 354 can have a shape extending in the first direction (x-axis direction). The length of the fourth magnet 354 in the first direction can be greater than its length in the third direction.

[0197] The fourth magnet 354 may include a fourth-first magnet 354a having a first polarity and a fourth-second magnet 354b having a second polarity. The fourth-first magnet 354a and the fourth-second magnet 354b may be arranged side by side in a first direction. That is, the fourth-first magnet 354a and the fourth-second magnet 354b may be positioned at the same distance from the second piezoelectric device 320.

[0198] The second sensing unit 372 can be placed in the region between the third-first magnet 353a and the third-second magnet 353b. For example, the second sensing unit 372 can be placed in a region that overlaps with the boundary between the third-first magnet 353a and the third-second magnet 353b in a second direction. The boundary between the third-first magnet 353a and the third-second magnet 353b can overlap with the center of the third magnet 353 in a first direction (x-axis direction).

[0199] That is, the second sensing unit 372 can be placed on the area overlapping with the center of the third magnet 353. Accordingly, when the first outer cover 200 is tilted by the second driving unit 302, the second sensing unit 372 can effectively sense the amount of rotation of the third magnet 353 to more accurately sense and determine the position.

[0200] refer to Figure 18 The second driving unit 302 may include a seventh magnet 357 and an eighth magnet 358, instead of a third yoke 333 and a fourth yoke 334.

[0201] The seventh magnet 357 can be placed in the second receiving space 255. The seventh magnet 357 can be placed on the lower part 210. The seventh magnet 357 can be placed in a region that does not overlap with the second piezoelectric device 320 in the second direction.

[0202] The seventh magnet 357 can be placed in the region corresponding to the third magnet 353 in the second direction. The seventh magnet 357 can have a shape extending in the first direction (x-axis direction). The length of the seventh magnet 357 in the first direction can be greater than its length in the third direction.

[0203] The seventh magnet may include a seventh-first magnet 357a having a second polarity and a seventh-second magnet 357b having a first polarity. The seventh-first magnet 357a and the seventh-second magnet 357b may be placed side-by-side in a third direction. The seventh-first magnet 357a may be placed in a region overlapping with the third-first magnet 353a in a second direction, and the seventh-second magnet 357b may be placed in a region overlapping with the third-second magnet 353b in a second direction.

[0204] The third magnet 353 and the seventh magnet 357 can arrange the first outer cover 200 at a predetermined position. For example, magnetic attraction can be generated between the third-first magnet 353a and the seventh-first magnet 357a and between the third-second magnet 353b and the seventh-second magnet 357b, and the first outer cover 200 can be compressed in the direction toward the base member 500 by this magnetic attraction. Accordingly, the first outer cover 200 can be positioned in a second direction overlapping the center of the second piezoelectric device 320 without the need for a separate fixing member.

[0205] Furthermore, the eighth magnet 358 can be placed in the second receiving space 255. The eighth magnet 358 can be placed on the lower portion 210. The eighth magnet 358 can be spaced apart from the seventh magnet 357. For example, the eighth magnet 358 can be spaced apart from the seventh magnet 357 along the optical axis (z-axis direction). Moreover, the eighth magnet 358 can be placed in a region that does not overlap with the second piezoelectric device 320 in the second direction. The second piezoelectric device 320 can be placed between the seventh magnet 357 and the eighth magnet 358.

[0206] The eighth magnet 358 can be placed in the region corresponding to the fourth magnet 354 in the second direction. The eighth magnet 358 can have a shape extending in the first direction (x-axis direction). The length of the eighth magnet 358 in the first direction can be greater than its length in the third direction.

[0207] The eighth magnet 358 may include an eighth-first magnet 358a having a second polarity and an eighth-second magnet 358b having a first polarity. The eighth-first magnet 358a and the eighth-second magnet 358b may be placed side-by-side in a third direction. The eighth-first magnet 358a may be placed in a region overlapping with the fourth-first magnet 354a in a second direction, and the eighth-second magnet 358b may be placed in a region overlapping with the fourth-second magnet 354b in a second direction.

[0208] The fourth magnet 354 and the eighth magnet 358 can arrange the first outer cover 200 at a predetermined position. For example, magnetic attraction can be generated between the fourth-first magnet 354a and the eighth-first magnet 358a and between the fourth-second magnet 354b and the eighth-second magnet 358b, and the first outer cover 200 can be compressed in the direction toward the base member 500 by this magnetic attraction. Accordingly, the first outer cover 200 can be positioned in a second direction overlapping the center of the second piezoelectric device 320 without the need for a separate fixing member.

[0209] The second sensing unit 372 can be placed in the region between the third-first magnet 353a and the third-second magnet 353b. For example, the second sensing unit 372 can be placed in the region that overlaps with the boundary between the third-first magnet 353a and the third-second magnet 353b in the second direction.

[0210] That is, the first camera actuator 1000 may include a plurality of magnets 353, 354, 357, and 358 disposed inside and below the first outer casing 200. In this case, the plurality of magnets 353, 354, 357, and 358 may be disposed in the region surrounding the second piezoelectric device 320. Accordingly, the first outer casing 200 may be more stably disposed on the base member 500 and tilted more stably by the driving force of the second piezoelectric device 320.

[0211] Moreover, reference Figure 19 The third magnet 353 may include a third-first magnet 353a having a first polarity and a third-second magnet 353b having a second polarity. The third-first magnet 353a and the third-second magnet 353b may be arranged in parallel in a first direction (x-axis direction).

[0212] Furthermore, the fourth magnet 354 may include a fourth-first magnet 354a having a first polarity and a fourth-second magnet 354b having a second polarity. The fourth-first magnet 354a and the fourth-second magnet 354b may be arranged side by side in the first direction.

[0213] Additionally, the seventh magnet 357 may include a seventh-first magnet 357a having a second polarity and a seventh-second magnet 357b having a first polarity. The seventh-first magnet 357a and the seventh-second magnet 357b may be arranged side-by-side in a first direction. Furthermore, the seventh-first magnet 357a may be placed in a region in a second direction that overlaps with the third-first magnet 353a, and the seventh-second magnet 357b may be placed in a region in a second direction that overlaps with the third-second magnet 353b.

[0214] Furthermore, the eighth magnet 358 may include an eighth-first magnet 358a having a second polarity and an eighth-second magnet 358b having a first polarity. The eighth-first magnet 358a and the eighth-second magnet 358b may be arranged side-by-side in a first direction. Additionally, the eighth-first magnet 358a may be placed in a region overlapping with the fourth-first magnet 354a in a second direction, and the eighth-second magnet 358b may be placed in a region overlapping with the fourth-second magnet 354b in a second direction.

[0215] The second sensing unit 372 can be placed in the region between the third-first magnet 353a and the third-second magnet 353b. For example, the second sensing unit 372 can be placed in a region that overlaps with the boundary between the third-first magnet 353a and the third-second magnet 353b in a second direction. The boundary between the third-first magnet 353a and the third-second magnet 353b can overlap with the center of the third magnet 353 in the second direction (y-axis direction).

[0216] That is, the second sensing unit 372 can be placed on the area overlapping with the center of the third magnet 353. Accordingly, when the first outer cover 200 is tilted by the second driving unit 302, the second sensing unit 372 can effectively sense the amount of rotation of the third magnet 353 to sense the position more accurately.

[0217] Figure 20 This is another exploded perspective view of the first camera actuator according to an embodiment. Furthermore, Figure 21 It is based on Figure 20 An exploded stereoscopic view of the prism unit of the first camera actuator, and Figure 22 It is based on Figure 20 A three-dimensional view of the prism unit of the first camera actuator.

[0218] In use Figures 20 to 22In the description, descriptions of those parts that are the same as or similar to those of the first camera actuator described above are omitted, and the same reference numerals are assigned to the same and similar parts.

[0219] refer to Figures 20 to 22 According to this embodiment, the first camera actuator 1000 may include a cover 100, a first outer cover 200, a prism unit 400, a first driving unit 301, a second driving unit 302, and a base member 500.

[0220] The first outer cover 200 may have a structure with multiple open side surfaces. For example, the first outer cover 200 may include a lower portion 210, a first side portion 221, a second side portion 222, and an upper portion 230.

[0221] The first outer cover 200 may include multiple receiving spaces. For example, the first outer cover 200 may include a first receiving space 205 and a second receiving space 255 separated by a partition wall 250.

[0222] The first receiving space 205 can be placed between the partition wall 250 and the second side portion 222. The prism unit 400 can be placed in the first receiving space 205. Additionally, the second receiving space 255 can be placed between the partition wall 250 and the first side portion 221. A portion of the structure of the first drive unit 301 can be placed in the second receiving space 255.

[0223] The prism unit 400 may include a prism 410 and a prism mover 430 placed on the prism 410.

[0224] The prism 410 can change the direction of light incident from the outside. That is, the prism 410 can change the direction of light incident from the outside onto the first camera actuator 1000 toward the second camera actuator 2000, which will be described later.

[0225] The prism mover 430 can accommodate the prism 410. Additionally, the prism mover 430 can include multiple outer surfaces. The prism mover 430 can include a first outer surface 430S1 facing the partition wall 250 and a second outer surface 430S2 facing the second side portion 222. Furthermore, the prism mover 430 can include: a third outer surface 430S3 facing the lower portion 210; and a fourth outer surface 430S4 positioned between the first outer surface and the third outer surfaces 430S1, 430S2, and 430S3 and surface 430S1, connecting the surfaces 430S1, 430S2, and 430S3 to each other.

[0226] The prism mover 430 may include at least one recess. For example, the prism mover 430 may include a first recess 430R1 disposed on the first outer surface 430S1. The first recess 430R1 may be disposed in a region that overlaps with the center of the prism unit 400 in a first direction (x-axis direction). The first recess 430R1 may have a groove shape in the direction from the first outer surface 430S1 to the second outer surface 430S2.

[0227] The first recess 430R1 can be placed in the region corresponding to the first guide protrusion 271. Specifically, the first recess 430R1 can be placed in the region overlapping with the first guide protrusion 271 in a first direction. The first recess 430R1 can have a shape corresponding to the shape of the first guide protrusion 271 and a depth corresponding to the depth of the first guide protrusion 271. The first recess 430R1 can provide space for the first guide protrusion 271 to be inserted. The prism unit 400 can be tilted in the vertical direction (y-axis direction) using the first guide protrusion 271 as a rotation axis.

[0228] Furthermore, the prism mover 430 may include a second recess 430R2. The second recess 430R2 may be placed on the second outer surface 430S2. The second recess 430R2 may be placed in a region that overlaps with the center of the prism unit 400 in a first direction (x-axis direction). The second recess 430R2 may have a groove shape in the direction from the second outer surface 430S2 to the first outer surface 430S1.

[0229] The second recess 430R2 can be positioned in the region corresponding to the first recess 430R1 and the first guide protrusion 271. The second recess 430R2 can also be positioned in the region overlapping with the first recess 430R1 in a first direction. The second recess 430R2 can provide space for the end of the first elastic member 610, described later, to be inserted.

[0230] Figure 23 It is based on Figure 20 A front view of the first camera actuator, and Figure 24 and Figure 25 It is used to explain the basis Figure 20 A view showing the arrangement of the first drive unit of the first camera actuator.

[0231] refer to Figures 23 to 25 The first drive unit 301 can be placed inside the first outer cover 200. The first drive unit 301 can be placed adjacent to the prism unit 400.

[0232] The first drive unit 301 may include a first piezoelectric device 310 and a first elastic member 610.

[0233] The first piezoelectric device 310 can be placed in the first receiving space 205. The first piezoelectric device 310 can be placed between the prism unit 400 and the partition wall 250. The first piezoelectric device 310 can be placed on the region corresponding to the first guide protrusion 271 and the first recess 430R1. The first piezoelectric device 310 can be placed in the region corresponding to the center of the prism unit 400 in a first direction. The first piezoelectric device 310 can be positioned to directly contact the first outer surface 430S1.

[0234] The first elastic member 610 can be placed within the first outer casing 200. The first elastic member 610 can be placed in a region that does not obstruct the light path incident on the first camera actuator 1000. For example, the first elastic member 610 can be placed on a first side portion 221 of the first outer casing 200. The first elastic member 610 can extend from the first side portion 221 along a first direction (x-axis direction) and can be bent in a region corresponding to the second outer surface 430S2 to extend in a third direction (z-axis direction). The first elastic member 610 can be spaced apart from the fourth outer surface 430S4 of the prism unit 400 and can be positioned to contact the second outer surface 430S2. Additionally, the end portion of the first elastic member 610 can be positioned to be inserted into the second recess 430R2. The end portion of the first elastic member 610 can be placed in a region overlapping the first guide protrusion 271 in the first direction.

[0235] The first elastic member 610 may include an elastically deformable material. For example, the first elastic member 610 may include a leaf spring.

[0236] The first elastic member 610 can compress the prism unit 400 in the direction toward the first piezoelectric device 310. That is, the first elastic member 610 can compress the prism unit 400 in the direction toward the first side portion 211. The first elastic member 610 can support the prism unit 400, which is tilted in the vertical direction (y-axis direction) by the first piezoelectric device 310, and connect the prism unit 400 and the first piezoelectric device 310.

[0237] The prism unit 400 may have a set position. Specifically, the first guide protrusion 271 may be provided by insertion into the first piezoelectric device 310 and the first outer surface 430S1 of the prism unit 400. A first elastic member 610 for pressing in the direction toward the partition wall 250 may be placed on the second outer surface 430S2.

[0238] Accordingly, the prism unit 400 can be placed at a set position in the first outer cover 200, and the first driving unit 301 can omit the first yoke 331, the second yoke 332, the first magnet 351 and the second magnet 352 described above.

[0239] Accordingly, the first camera actuator 1000 can have a simpler structure and can be implemented in a smaller size. In addition, during the tilting of the prism unit 400 along the vertical direction (y-axis direction), it is possible to prevent the structure of at least one of the prism unit 400 and the first piezoelectric device 310 from separating from the axis of rotation.

[0240] Figures 26 to 28 It is used to explain the basis Figure 20 A view showing the arrangement of the second drive unit of the first camera actuator.

[0241] refer to Figures 26 to 28 The second drive unit 302 can be placed on the base member 500. The second drive unit 302 can be placed adjacent to the first outer cover 200.

[0242] The second drive unit 302 may include a second piezoelectric device 320, a second elastic member 620 and a third elastic member 630.

[0243] The second piezoelectric device 320 can be disposed on the base member 500. The second piezoelectric device 320 can be disposed between the base member 500 and the first outer cover 200. Specifically, the second piezoelectric device 320 can be disposed between the upper surface of the base member 500 and the lower portion 210 of the first outer cover 200. The second piezoelectric device 320 can be disposed in the region corresponding to the second guide protrusion. The second piezoelectric device 320 can be disposed in the region corresponding to the center of the prism unit 400 in the second direction (y-axis direction). The second piezoelectric device 320 can be disposed in the region overlapping with the center of the prism 410 in the second direction.

[0244] The second elastic member 620 and the third elastic member 630 may be placed on the base member 500. The second elastic member 620 and the third elastic member 630 may be placed in areas that do not obstruct the light path incident on the first camera actuator 1000.

[0245] For example, the second elastic member 620 may be positioned at one end of the base member 500. The second elastic member 620 may extend from the upper surface of the base member 500 along a second direction (y-axis direction) and may be bent in the region corresponding to the upper portion 230 of the first outer cover 200 to extend in a first direction (x-axis direction). In this case, the second elastic member 620 extending in both the first and second directions may be spaced apart from the first outer cover 200. Furthermore, the end of the second elastic member 620 extending in the first direction may be bent to extend in a third direction (z-axis direction) and may contact the upper portion 230 of the first outer cover 200.

[0246] Furthermore, the third elastic member 630 can be positioned at one end of the base member 500. The third elastic member 630 can extend from the upper surface of the base member 500 along a second direction (y-axis direction) and can be bent in the region corresponding to the upper portion 230 of the first outer cover 200 to extend in a first direction (x-axis direction). In this case, the third elastic member 630 extending in both the first and second directions can be spaced apart from the first outer cover 200. Additionally, the end of the third elastic member 630 extending in the first direction can be bent to extend in a third direction (z-axis direction) and can contact the upper portion 230 of the first outer cover 200.

[0247] The second elastic member 620 and the third elastic member 630 may have shapes that are symmetrical to each other. In addition, the second elastic member 620 and the third elastic member 630 may be placed in a region that is symmetrical with respect to the center of the prism unit 400.

[0248] The second elastic member 620 and the third elastic member 630 may comprise an elastically deformable material. For example, the second elastic member 620 and the third elastic member 630 may comprise a leaf spring. The second elastic member 620 and the third elastic member 630 may compress the first outer cover 200 toward the second piezoelectric device 320. That is, the second elastic member 620 and the third elastic member 630 may compress the first outer cover 200 in a direction toward the base member 500. The second elastic member 620 and the third elastic member 630 may support the first outer cover 200, which is tilted in the left-right direction (x-axis direction) by the second piezoelectric device 320, and connect the first outer cover 200 to the second piezoelectric device 320.

[0249] The first outer cover 200 may have a set position. Specifically, the second guide protrusion 272 may be positioned to be inserted into the second guide hole 321 of the second piezoelectric device 320, and the second elastic member 620 and the third elastic member 630 for pressing in the direction of the base member 500 may be positioned on the upper part 230 of the first outer cover 200.

[0250] Accordingly, the first outer cover 200 can be placed at a position set on the base member 500, and the second drive unit 302 can omit the third yoke 333, fourth yoke 334, third magnet 353 and fourth magnet 354 described above.

[0251] Accordingly, the first camera actuator 1000 can have a simpler structure and can be implemented in a smaller size. In addition, during the process of the first outer cover 200 tilting along the vertical direction (y-axis direction), it is possible to prevent the structure of at least one of the first outer cover 200 and the second piezoelectric device 320 from separating from the rotation axis.

[0252] Figure 29 This is a perspective view of a camera module according to an embodiment, and Figure 30 This is a perspective view of the camera module according to this embodiment, with some components omitted.

[0253] refer to Figure 29 and Figure 30 According to this embodiment, the camera module 10 may include one or more camera actuators. For example, the camera module 10 may include the first camera actuator 1000 and the second camera actuator 2000 described above, as well as a cover housing 15 for protecting the first camera actuator 1000 and the second camera actuator 2000.

[0254] The first camera actuator 1000 may be an optical image stabilizer (OIS) actuator. In this case, light incident on the camera module 10 from the outside can first be incident on the first camera actuator 1000. Moreover, by changing the optical path, the light incident on the first camera actuator 1000 can be incident on the second camera actuator 2000. Subsequently, the light passing through the second camera actuator 2000 can be incident on the image sensor 2900.

[0255] The second camera actuator 2000 may be a zoom and / or autofocus actuator. The second camera actuator 2000 may include multiple lenses. The second camera actuator 2000 can perform zoom or autofocus functions by moving at least one lens in the optical axis direction according to a control signal from a controller. The second camera actuator 2000 will be described in more detail with reference to the accompanying drawings, which will be described later.

[0256] Figure 31 This is an exploded perspective view of the second camera actuator according to an embodiment. Figure 32 This is a cross-sectional view of the second camera actuator according to an embodiment. Figure 33 This is a front view of the second camera actuator according to an embodiment. Figure 34 This is a perspective view showing the third and fourth drive units disposed within the first housing of the second camera actuator according to an embodiment. Figure 35 This is an exploded perspective view of the third drive unit according to the embodiment. Figure 36 This is an exploded perspective view of the fourth drive unit according to the embodiment, and Figure 37 This is a perspective view of a partial structure of the second camera actuator according to an embodiment.

[0257] refer to Figures 31 to 37 According to this embodiment, the second camera actuator 2000 may include a second outer cover 2100, a first lens unit 2105, a first lens barrel 2200, a third drive unit 2300, a second lens barrel 2400, and a fourth drive unit 2500.

[0258] The second outer cover 2100 can form the exterior of the second camera actuator 2000. The second outer cover 2100 can have an open upper region and a lower region, and can have a hexahedral shape.

[0259] The second outer cover 2100 may include a receiving space. The first lens barrel 2200, the third drive unit 2300, the second lens barrel 2400, and the fourth drive unit 2500 may be accommodated in the receiving space of the second outer cover 2100.

[0260] The second outer cover 2100 may include a first sub-outer cover 2110 and a second sub-outer cover 2120.

[0261] The first sub-cover 2110 may include a first hole 2111. The first hole 2111 may be formed on one side of the first sub-cover 2110. The first hole 2111 is a hollow hole and may be a hole passing through the outer and inner sides of the first sub-cover 2110.

[0262] The first sub-cover 2110 may further include a second hole 2112 and a third hole 2113. The second hole 2112 and the third hole 2113 may be positioned on one side of the first sub-cover 2110. The second hole 2112 and the third hole 2113 may be hollow holes passing through the outer and inner sides of the first sub-cover 2110. The second hole 2112 and the third hole 2113 may be spaced apart from the first hole 2111. Specifically, the first hole 2111 may be positioned between the second hole 2112 and the third hole 2113. The first hole 2111 may be positioned with an equal spacing from the second hole 2112 and the third hole 2113.

[0263] The second hole 2112 may include a plurality of protrusions extending from the inner peripheral surface of the second hole 2112 toward the center of the second hole 2112. For example, the plurality of protrusions may include a first protrusion 2112a positioned at the upper end of the second hole 2112 along the optical axis and a second protrusion 2112b positioned at the lower end of the second hole 2112.

[0264] Specifically, the first protrusion 2112a may include a plurality of first sub-protrusions (not shown) spaced apart from each other. The plurality of first sub-protrusions may be arranged at equal intervals from the center of the second hole 2112 along a concentric circle. Furthermore, the second protrusion 2112b may be spaced apart from the first protrusion 2112a in the optical axis direction. The second protrusion 2112b may be positioned below the first protrusion 2112a. The second protrusion 2112b may include a plurality of second sub-protrusions (not shown) spaced apart from each other. The plurality of second sub-protrusions may be arranged at equal intervals from the center of the second hole 2112 along a concentric circle. The first protrusion 2112a and the second protrusion 2112b may provide space for placing a portion of the third drive unit 2300 (e.g., the first buffer member 2321), which will be described later.

[0265] The third hole 2113 may include a plurality of protrusions extending from the inner peripheral surface of the third hole 2113 toward the center of the third hole 2113. The plurality of protrusions may include a third protrusion 2113a positioned at the upper end of the third hole 2113 relative to the optical axis and a fourth protrusion 2113b positioned at the lower end of the third hole 2113.

[0266] The third protrusion 2113a may include a plurality of third sub-protrusions (not shown) spaced apart from each other. The plurality of third sub-protrusions may be arranged at equal intervals from the center of the third hole 2113 along a concentric circumference. Furthermore, the fourth protrusion 2113b may be spaced apart from the third protrusion 2113a in the optical axis direction. The fourth protrusion 2113b may include a plurality of fourth sub-protrusions (not shown) spaced apart from each other. The plurality of fourth sub-protrusions may be arranged at equal intervals from the center of the third hole 2113 along a concentric circumference. The third protrusion 2113a and the fourth protrusion 2113b may provide space for placing a portion of the fourth drive unit 2500 (e.g., the third buffer member 2521), which will be described later.

[0267] The second sub-cover 2120 can be positioned below the first sub-cover 2110. Specifically, the second sub-cover 2120 can be positioned below the first sub-cover 2110 in a third direction (z-axis, optical axis direction). The second sub-cover 2120 can be positioned closer to the image sensor 2900, which will be described later, than the first sub-cover 2110. The first lens barrel 2200, the third drive unit 2300, the second lens barrel 2400, and the fourth drive unit 2500 can be housed within the second sub-cover 2120.

[0268] The second sub-cover 2120 can be coupled to the first sub-cover 2110. For example, the first sub-cover 2110 and the second sub-cover 2120 can be coupled by a separate fastening member (not shown) such as a screw. Alternatively, the first sub-cover 2110 and the second sub-cover 2120 can be coupled to each other by a physical connection formed therein by a connecting claw and a connecting groove, respectively.

[0269] The first lens unit 2105 can be disposed within the second outer cover 2100 and may include at least one lens. For example, the first lens unit 2105 can be disposed within the first sub-outer cover 2110. Specifically, the first lens unit 2105 can be disposed within the first hole 2111 of the first sub-outer cover 2110. For example, the first lens unit 2105 can be connected to the first sub-outer cover 2110 by means of a thread formed on the inner circumferential surface of the first hole 2111.

[0270] The first lens barrel 2200 can be placed within the second outer casing 2100. The first lens barrel 2200 can also be placed within the second sub-outer casing 2120. The first lens barrel 2200 can be positioned below the first lens unit 2105. For example, the first lens barrel 2200 can be positioned below the first lens unit 2105 along the optical axis and can be closer to the image sensor 2900 than the first lens unit 2105. The first lens barrel 2200 can be coupled to the third drive unit 2300. The first lens barrel 2200 can be moved within the second outer casing 2100 via the third drive unit 2300. Specifically, the first lens barrel 2200 can be moved along the optical axis via the third drive unit 2300.

[0271] The first lens barrel 2200 may include a first barrel portion 2210, a second lens unit 2205, a first guide portion 2220, and a first elastic portion 2230.

[0272] The first cylindrical portion 2210 can be placed in a region overlapping with the optical axis and can have an open shape on one surface and another surface. For example, the first cylindrical portion 2210 can have a cylindrical shape with one surface and another surface open.

[0273] The first cylindrical portion 2210 may include a first through hole 2211. The first through hole 2211 may be a through hole that penetrates one surface and another surface of the first cylindrical portion 2210. Here, one surface of the first cylindrical portion 2210 may be the surface facing the first lens unit 2105, and the other surface may be the surface opposite to the first surface and facing the image sensor 2900.

[0274] The second lens unit 2205 can be placed on the first cylindrical portion 2210. Specifically, the second lens unit 2205 can be placed in the first through hole 2211. For example, a spiral can be formed on the inner circumferential surface of the first through hole 2211, and the second lens unit 2205 can be connected to the first cylindrical portion 2210 through the spiral.

[0275] The second lens unit 2205 may include at least one lens. The second lens unit 2205 can perform a zoom function. The second lens unit 2205 can move in the optical axis direction. Specifically, the second lens unit 2205 can move relative to the first lens unit 2105 in the optical axis direction.

[0276] The first guide portion 2220 can extend outward from the first cylindrical portion 2210. For example, the first guide portion 2220 can extend from the first cylindrical portion 2210 in a direction perpendicular to the optical axis, such as in a first direction (x-axis direction).

[0277] The first guide portion 2220 may include a first upper surface 2221, a first side surface 2222, and a first lower surface 2223.

[0278] The first upper surface 2221 may face the inner upper surface of the second outer cover 2100. The first upper surface 2221 may also face the inner upper surface of the second outer cover 2100 in a second direction (y-axis direction). The first upper surface 2221 may include a plurality of sub-upper surfaces. Specifically, the first upper surface 2221 may include a first sub-upper surface 2221a and a second sub-upper surface 2221b, the second sub-upper surface 2221b being positioned lower than the first sub-upper surface 2221a in the second direction (y-axis direction). That is, compared to the first sub-upper surface 2221a, the second sub-upper surface 2221b may be positioned closer to the first lower surface 2223. At least one first fastening protrusion (not shown) may be placed on the second sub-upper surface 2221b. The first fastening protrusion may have a shape that protrudes upward on the second sub-upper surface 2221b. The first fastening protrusion may be inserted into a first retaining groove (not shown) formed in the first elastic portion 2230, which will be described later.

[0279] Furthermore, the first upper surface 2221 may include a first stepped surface 2225 disposed between the first sub-upper surface 2221a and the second sub-upper surface 2221b. The first stepped surface 2225 may be connected to the ends of the first sub-upper surface 2221a and the second sub-upper surface 2221b. The first stepped surface 2225 may be defined as a first stepped portion 2225. That is, the first upper surface 2221 may include the first sub-upper surface 2221a, the second sub-upper surface 2221b, and the first stepped portion 2225, and may have a stepped structure.

[0280] The first lower surface 2223 may face the inner lower surface of the second outer cover 2100, which will be described later. A first groove 223h1 may be placed on the first lower surface 2223. The first groove 223h1 may have a concave shape in the direction from the first lower surface 2223 to the first upper surface 2221. A first magnetic calibrator 2610, which will be described later, may be placed in the first groove 223h1.

[0281] Furthermore, the second groove 2223h2 can be placed on the first lower surface 2223. The second groove 2223h2 can be spaced apart from the first groove 223h1. The second groove 2223h2 can be placed in the edge region of the first lower surface 2223. The second groove 2223h2 can provide an area for placing a portion of the first elastic portion 2230, which will be described later. In detail, the second groove 2223h2 can provide an area for mounting and securing the first elastic portion 2230.

[0282] A first side surface 2222 can be positioned between the first upper surface 2221 and the first lower surface 2223. More specifically, the first side surface 2222 can be a surface connecting the first upper surface 2221 and the first lower surface 2223. More specifically, the first side surface 2222 can be a surface connecting the second sub-upper surface 2221b and the first lower surface 2223. The first side surface 2222 can face the second inner surface of the second sub-outer cover 2120, which will be described later.

[0283] The first recess 2222h can be placed on the first side surface 2222. The first recess 2222h can have a concave shape in the direction from the first side surface 2222 to the first cylindrical portion 2210. Moreover, the first recess 2222h can have a groove shape extending in the optical axis direction (z-axis direction). When viewed from the front, the first recess 2222h can have a V-shaped shape.

[0284] The first guide portion 2220 may include a first insertion hole 2220h1. The first insertion hole 2220h1 may be a hole passing through one surface and another surface of the first guide portion 2220. Here, one surface of the first guide portion 2220 may be the surface facing the first lens unit 2105, and the other surface may be the surface opposite to the first surface and facing the image sensor 2900.

[0285] The first pin 2250 can be placed in the first insertion hole 2220h1. The first pin 2250 can be positioned to pass through the first insertion hole 2220h1. The first pin 2250 can have a shape extending in the optical axis direction (z-axis direction), and its length in the optical axis direction can be greater than the length of the first lens barrel 2200. The first pin 2250 can be coupled to at least one of the first sub-cover 2110 and the second sub-cover 2120. The first lens barrel 2200 can move along the first pin 2250 in the optical axis direction. Thus, the second lens unit 2205 placed in the first lens barrel 2200 can perform zoom and / or autofocus functions.

[0286] The first elastic portion 2230 can be placed on the first guide portion 2220. For example, the first elastic portion 2230 can be placed on the first upper surface 2221, the first lower surface 2223, and the first side surface 2222 of the first guide portion 2220. The first elastic portion 2230 can be connected to the first guide portion 2220.

[0287] The first elastic part 2230 may include a first elastic member 2231 and a second elastic member 2232.

[0288] The first elastic member 2231 can be connected to the first guide portion 2220. The first elastic member 2231 can be placed at a predetermined position on the first side surface 2222.

[0289] The first elastic member 2231 may have a shape corresponding to the first side surface 2222. For example, the first elastic member 2231 may include a first region 2231a, a second region 2231b, and a third region 2231c.

[0290] The first region 2231a and the second region 2231b can be placed on the first side surface 2222 of the first guide portion 2220 and can be spaced apart from each other. The first region 2231a and the second region 2231b can be placed on the area of ​​the first side surface 2222 where the first recess 2222h is not placed.

[0291] The third region 2231c can be placed between the first region 2231a and the second region 2231b to connect the two regions 2231a and 2231b. The third region 2231c can be placed in the region corresponding to the first recess 2222h. The third region 2231c can have a V-shaped shape corresponding to the first recess 2222h.

[0292] The second elastic member 2232 can be placed on the first guide portion 2220. The second elastic member 2232 can be connected to the first guide portion 2220.

[0293] The second elastic member 2232 may include a fourth region 2232a, a fifth region 2232b, and a sixth region 2232c.

[0294] The fourth region 2232a can be placed on the first upper surface 2221 of the first guide portion 2220. More specifically, the fourth region 2232a can be placed on the second sub-upper surface 2221b of the first guide portion 2220. The fourth region may include a first fixing groove (not shown). The first fixing groove can be placed in the region corresponding to the first fastening protrusion and can have a shape corresponding to the first fastening protrusion.

[0295] The fifth region 2232b can be connected to the fourth region 2232a. For example, the fifth region 2232b can be bent at one end of the fourth region 2232a and can be positioned on the first side surface 2222 of the first guide portion 2220. The fifth region 2232b can be positioned on the first elastic member 2231. The fifth region 2232b can be parallel to the first region 2231a and the second region 2231b. The fifth region 2232b can be positioned to cover the first elastic member 2231.

[0296] The sixth region 2232c can be connected to the fifth region 2232b. For example, the sixth region 2232c can be bent at one end of the fifth region 2232b and can be placed on the first lower surface 2223 of the first guide portion 2220. A portion of the sixth region 2232c can be inserted into a second groove 2223h2 placed on the first lower surface 2223.

[0297] That is, by engaging the first fastening protrusion with the first fixing groove formed in the fourth region 2232a while inserting the sixth region 2232c into the second groove 2223h2, the second elastic member 2232 can be physically connected to the first guide portion 2220. Accordingly, the first elastic portion 2230 can remain firmly connected to the first guide portion 2220.

[0298] Additionally, the first lens barrel 2200 may further include a first guide groove 2210h1. The first guide groove 2210h1 may be positioned in a region extending outward from the first barrel portion 2210. The first guide groove 2210h1 may be positioned in a region corresponding to the second pin 2450, described later. The first guide groove 2210h1 provides space for the second pin 2450 to be inserted. The first lens barrel 2200 can be moved in the optical axis direction via the first pin 2250 and the second pin 2450. In this case, the first guide groove 2210h1 may have an open shape on one side. For example, the first guide groove 2210h1 may have an open shape on the side facing the first inner surface of the second outer casing 2100. Accordingly, friction and vibration generated when the first lens barrel 2200 is moved by the third drive unit 2300 can be minimized.

[0299] The second camera actuator 2000 may include a third drive unit 2300. The third drive unit 2300 may be housed within the second housing 2100. The third drive unit 2300 may be coupled to the first lens barrel 2200. The third drive unit 2300 may move the first lens barrel 2200 in the optical axis direction (z-axis direction).

[0300] The third drive unit 2300 may include a first piezoelectric device 2310, a first extension rod 2320, a first buffer member 2321, and a second buffer member 2322.

[0301] The first piezoelectric device 2310 may include a piezoelectric device. For example, the first piezoelectric device 2310 may include a material that is mechanically deformed by an applied electric current. The first piezoelectric device 2310 may contract or expand by the applied electric current and may cause mechanical deformation in a predetermined direction. For example, the first piezoelectric device 2310 may generate vibration while causing mechanical deformation in the optical axis direction (z-axis direction) by the applied electric current.

[0302] The first piezoelectric device 2310 may include a first disc portion 2311 and a first protrusion 2312. The first disc portion 2311 may be plate-shaped and may be placed on a second hole 2112. For example, the first disc portion 2311 may be placed on a first protrusion 2112a of the second hole 2112. More specifically, the first disc portion 2311 may be placed on the plurality of first sub-protrusions. The first protrusion 2112a may support the first disc portion 2311.

[0303] The first protrusion 2312 can be positioned below the first disk portion 2311. Specifically, the first protrusion 2312 can be positioned below the first disk portion 2311 in the third direction (z-axis direction) and can be connected to the first disk portion 2311. A portion of the first protrusion 2312 can be placed in the second hole 2112. The first protrusion 2312 can have a shape protruding towards the image sensor 2900. The width of the first protrusion 2312 (x-axis, y-axis direction) can change towards the optical axis direction. For example, the width of the first protrusion 2312 can decrease as it approaches the image sensor 2900.

[0304] The first extension rod 2320 can extend in the direction of the optical axis. The first extension rod 2320 can be placed parallel to the optical axis and can be connected to the first piezoelectric device 2310. For example, the upper end of the first extension rod 2320 can be connected to the first protrusion 2312. In addition, the lower end of the first extension rod 2320 can be inserted into the lower end of the second outer cover 2100, for example, into a fourth hole (not shown) formed at the lower end of the second sub-outer cover 2120.

[0305] Additionally, a region of the first extension rod 2320 can be connected to the first lens barrel 2200. For example, the first extension rod 2320 can be connected to the first lens barrel 2200 via the first elastic portion 2230. Specifically, the first extension rod 2320 can be positioned between the first elastic member 2231 and the second elastic member 2232. More specifically, the first extension rod 2320 can be positioned between the third region 2231c of the first elastic member 2231 and the fifth region 2232b of the second elastic member 2232. The first extension rod 2320 can be fixed by the elastic force of the first elastic member 2231 and the second elastic member 2232.

[0306] The first extension rod 2320 can transmit the vibration generated in the first piezoelectric device 2310 to the first lens barrel 2200. The first lens barrel 2200 can move up or down (in the z-axis direction, optical axis direction) according to the vibration direction of the first extension rod 2320. As a result, the second lens unit 2205 in the first lens barrel 2200 can move to perform a zoom function of magnification or reduction.

[0307] The first buffer member 2321 can be placed on the first extension rod 2320. The first buffer member 2321 can be placed on the upper region of the first extension rod 2320. The first buffer member 2321 can be placed in the second hole 2112 of the second outer cover 2100. For example, the first buffer member 2321 can be placed between the first protrusion 2112a and the second protrusion 2112b of the second hole 2112. The first buffer member 2321 can be fixed to the position defined by the first protrusion 2112a and the second protrusion 2112b. Additionally, the first buffer member 2321 may include a through hole for the insertion of the first extension rod 2320.

[0308] The second buffer member 2322 can be placed on the first extension rod 2320. The second buffer member 2322 can be placed on the lower region of the first extension rod 2320. The second buffer member 2322 can be spaced apart from the first buffer member 2321 in the optical axis direction. The second buffer member 2322 can be placed in a fourth hole (not shown) of the second outer cover 2100. The second buffer member 2322 can be positioned to be inserted into the fourth hole. The second buffer member 2322 may include a through hole for insertion of the first extension rod 2320.

[0309] The first buffer member 2321 and the second buffer member 2322 can prevent noise caused by the vibration of the first extension rod 2320. In addition, the first buffer member 2321 and the second buffer member 2322 can prevent the first extension rod 2320 from being deformed or damaged due to external impact.

[0310] The second lens barrel 2400 can be placed within the second outer casing 2100. The second lens barrel 2400 can also be placed within the second sub-outer casing 2120. The second lens barrel 2400 can be positioned below the first lens barrel 2200. For example, the second lens barrel 2400 can be positioned below the first lens barrel 2200 in the optical axis direction and can be closer to the image sensor 2900 than the first lens barrel 2200. The second lens barrel 2400 can be coupled to the fourth drive unit 2500. The second lens barrel 2400 can be moved within the second outer casing 2100 via the fourth drive unit 2500. Specifically, the second lens barrel 2400 can be moved in the optical axis direction via the fourth drive unit 2500.

[0311] The second lens barrel 2400 may include a second barrel portion 2410, a third lens unit 2405, a second guide portion 2420, and a second elastic portion 2430.

[0312] The second cylindrical portion 2410 can be placed in the region overlapping with the optical axis and can have an open shape on one surface and another surface. For example, the second cylindrical portion 2410 can have a cylindrical shape with one surface and another surface open.

[0313] The second cylindrical portion 2410 may include a second through hole 2411. The second through hole 2411 may be a through hole penetrating one surface and another surface of the second cylindrical portion 2410. Here, one surface of the second cylindrical portion 2410 may be the surface facing the first lens barrel 2200, and the other surface may be the surface opposite to the first surface and facing the image sensor 2900.

[0314] The third lens unit 2405 can be placed on the second cylindrical portion 2410. Specifically, the third lens unit 2405 can be placed in the second through hole 2411. For example, a spiral can be formed on the inner circumferential surface of the second through hole 2411, and the third lens unit 2405 can be connected to the second cylindrical portion 2410 through this spiral.

[0315] The third lens unit 2405 may include at least one lens. The third lens unit 2405 can perform an autofocus function. The third lens unit 2405 can move in the optical axis direction. Specifically, the third lens unit 2405 can move relative to the first lens unit 2105 in the optical axis direction. The third lens unit 2405 can move independently of the second lens unit 2205. Moreover, the distance that the third lens unit 2405 can move in the optical axis direction may be the same as or different from the distance that the second lens unit 2205 can move in the optical axis direction.

[0316] The second guide portion 2420 can extend outward from the second cylindrical portion 2410. For example, the second guide portion 2420 can extend from the second cylindrical portion 2410 in a direction perpendicular to the optical axis, such as in a first direction (x-axis direction). In this case, the second guide portion 2420 can extend in a direction opposite to the first guide portion 2220. For example, the first guide portion 2220 can extend from the first cylindrical portion 2210 in the +x-axis direction, and the second guide portion 2420 can extend from the second cylindrical portion 2410 in the -x-axis direction.

[0317] The second guide portion 2420 may include a second lower surface 2421, a second side surface 2422, and a second upper surface 2423.

[0318] The second upper surface 2423 may face the inner upper surface of the second outer cover 2100. The second upper surface 2423 may face the inner upper surface of the second outer cover 2100 in a second direction (y-axis direction). The third groove 2423h1 may be placed on the second upper surface 2423. The third groove 2423h1 may have a concave shape in the direction from the second upper surface 2423 to the second lower surface 2421. The second magnetic calibrator 2620, described later, may be placed in the third groove 2423h1.

[0319] Additionally, a fourth groove 2423h2 can be placed on the second upper surface 2423. The fourth groove 2423h2 can be spaced apart from the third groove 2423h1. The fourth groove 2423h2 can be placed in the edge region of the second upper surface 2423. The fourth groove 2423h2 can provide an area for placing a portion of the second elastic portion 2430, described later. Specifically, the fourth groove 2423h2 can provide an area for mounting and securing the second elastic portion 2430.

[0320] The second lower surface 2421 may face the inner lower surface of the second outer cover 2100. The second lower surface 2421 may face the inner lower surface of the second outer cover 2100 in a second direction (y-axis direction). The second lower surface 2421 may include a plurality of sub-lower surfaces. Specifically, the second lower surface 2421 may include a first sub-lower surface 2421a and a second sub-lower surface 2421b, the second sub-lower surface 2421b being positioned above the first sub-lower surface 2421a in the second direction (y-axis direction). That is, the second sub-lower surface 2421b may be positioned closer to the second upper surface 2423 than the first sub-lower surface 2421a. At least one second fastening protrusion (not shown) may be placed on the second sub-lower surface 2421b. The second fastening protrusion may have a shape that protrudes downward from the second sub-lower surface 2421b. The second fastening protrusion may be inserted into a second retaining groove (not shown) formed in the second elastic portion 2430, which will be described later.

[0321] Furthermore, the second lower surface 2421 may include a second stepped surface 2425, which is disposed between the first sub-lower surface 2421a and the second sub-lower surface 2421b. The second stepped surface 2425 may be connected to the ends of the first sub-lower surface 2421a and the second sub-lower surface 2421b. The second stepped surface 2425 may be defined as a second stepped portion 2425. That is, the second lower surface 2421 may include the first sub-lower surface 2421a, the second sub-lower surface 2421b, and the second stepped portion 2425, and may have a stepped structure.

[0322] The second side surface 2422 may be positioned between the second upper surface 2423 and the second lower surface 2421. More specifically, the second side surface 2422 may be the surface connecting the second upper surface 2423 and the second lower surface 2421. More specifically, the second side surface 2422 may be the surface connecting the second sub-lower surface 2421b and the second upper surface 2423. The second side surface 2422 may face the first inner surface of the second sub-cover 2120, which will be described later.

[0323] The second recess 2422h can be placed on the second side surface 2422. The second recess 2422h can have a concave shape extending from the second side surface 2422 toward the second cylindrical portion 2410. Moreover, the second recess 2422h can have a groove shape extending in the optical axis direction (z-axis direction). When viewed from the front, the second recess 2422h can have a V-shaped shape.

[0324] The second guide portion 2420 may include a second insertion hole 2420h1. The second insertion hole 2420h1 may be a hole passing through one surface and another surface of the second guide portion 2420. Here, one surface of the second guide portion 2420 may be the surface facing the first lens barrel 2200, and the other surface may be the surface opposite to the first surface and facing the image sensor 2900.

[0325] The second pin 2450 can be placed in the second insertion hole 2420h1. The second pin 2450 can be positioned to pass through the second insertion hole 2420h1. The second pin 2450 can have a shape extending in the optical axis direction (z-axis direction). The second pin 2450 can be spaced apart from the first pin 2250 and can be parallel to the first pin 2250. The length of the second pin 2450 in the optical axis direction can be greater than the length of the second lens barrel 2400. The second pin 2450 can be connected to at least one of the first sub-cover 2110 and the second sub-cover 2120. The second lens barrel 2400 can move along the second pin 2450 in the optical axis direction. Thus, the third lens unit 2405 placed in the second lens barrel 2400 can perform zoom and / or autofocus functions.

[0326] The second elastic portion 2430 can be placed on the second guide portion 2420. For example, the second elastic portion 2430 can be placed on the second upper surface 2423, the second lower surface 2421, and the second side surface 2422 of the second guide portion 2420. The second elastic portion 2430 can be connected to the second guide portion 2420.

[0327] The second elastic part 2430 may include a third elastic member 2431 and a fourth elastic member 2432.

[0328] The third elastic member 2431 can be connected to the second guide portion 2420. The third elastic member 2431 can be placed at a predetermined position on the second side surface 2422.

[0329] The third elastic member 2431 may have a shape corresponding to the second side surface 2422. For example, the third elastic member 2431 may include a seventh region 2431a, an eighth region 2431b, and a ninth region 2431c.

[0330] The seventh region 2431a and the eighth region 2431b can be placed on the second side surface 2422 of the second guide portion 2420 and can be spaced apart from each other. The seventh region 2431a and the eighth region 2431b can be placed on the region of the second side surface 2422 where the second recess 2422h is not placed.

[0331] The ninth region 2431c can be placed between the first region 2231a and the second region 2231b to connect the two regions 2431a and 2431b. The ninth region 2431c can be placed in the region corresponding to the second recess 2422h. The ninth region 2431c can have a V-shaped shape corresponding to the second recess 2422h.

[0332] The fourth elastic member 2432 can be placed on the second guide portion 2420. The fourth elastic member 2432 can be connected to the second guide portion 2420.

[0333] The fourth elastic member 2432 may include a tenth region 2432a, an eleventh region 2432b, and a twelfth region 2432c.

[0334] The tenth region 2432a can be placed on the second lower surface 2421 of the second guide portion 2420. Specifically, the tenth region 2432a can be placed on the second sub-lower surface 2421b of the second guide portion 2420. The tenth region 2431a may include a second fixing groove (not shown). The second fixing groove can be placed in the region corresponding to the second fastening protrusion and can have a shape corresponding to the second fastening protrusion.

[0335] The eleventh region 2432b can be connected to the tenth region 2432a. For example, the eleventh region 2432b can be bent at one end of the tenth region 2432a and can be positioned on the second side surface 2422 of the second guide 2420. The eleventh region 2432b can be positioned on the third elastic member 2431. The eleventh region 2432b can be parallel to the seventh region 2431a and the eighth region 2431b. The eleventh region 2432b can be positioned to cover the third elastic member 2431.

[0336] The twelfth region 2432c can be connected to the eleventh region 2432b. For example, the twelfth region 2432c can be bent at one end of the eleventh region 2432b and can be placed on the second upper surface 2423 of the second guide 2420. A portion of the twelfth region 2432c can be inserted into a fourth groove 2423h2 placed on the second upper surface 2423.

[0337] That is, by engaging the second fastening protrusion in the second fixing groove formed in the seventh region 2431a while inserting the twelfth region 2432c into the fourth groove 2423h2, the fourth elastic member 243 can be physically connected to the second guide portion 2420. Accordingly, the second elastic portion 2430 can remain firmly connected to the second guide portion 2420.

[0338] Additionally, the second lens barrel 2400 may further include a second guide groove 2410h1. The second guide groove 2410h1 may be positioned in a region extending outward from the second barrel portion 2410. The second guide groove 2410h1 may be positioned in a region corresponding to the first pin 2250. The second guide groove 2410h1 provides space for the first pin 2250 to be inserted. The second lens barrel 2400 can move in the optical axis direction via the first pin 2250 and the second pin 2450. In this case, the second guide groove 2410h1 may have an open shape on one side. For example, the second guide groove 2410h1 may have an open shape on the side facing the second inner surface of the second outer casing 2100. Accordingly, friction and vibration generated when the second lens barrel 2400 is moved by the fourth drive unit 2500 can be minimized.

[0339] The second camera actuator 2000 may include a fourth drive unit 2500. The fourth drive unit 2500 may be housed within the second housing 2100. The fourth drive unit 2500 may be coupled to the second lens barrel 2400. The fourth drive unit 2500 may move the second lens barrel 2400 in the optical axis direction (z-axis direction).

[0340] The fourth drive unit 2500 may include a second piezoelectric device 2510, a second extension 2520, a third buffer member 2521 and a fourth buffer member 2522.

[0341] The second piezoelectric device 2510 may include a piezoelectric device. For example, the second piezoelectric device 2510 may include a material that is mechanically deformed by an applied electric current. The second piezoelectric device 2510 may contract or expand by the applied electric current and may cause mechanical deformation in a predetermined direction. For example, the second piezoelectric device 2510 may generate vibration while causing mechanical deformation in the optical axis direction (z-axis direction) by the applied electric current.

[0342] The second piezoelectric device 2510 may include a second disc portion 2511 and a second protrusion 2512. The second disc portion 2511 has a plate shape and can be placed on a third hole 2113. For example, the second disc portion 2511 can be placed on a third protrusion 2113a of the third hole 2113. More specifically, the second disc portion 2511 can be placed on the plurality of third sub-protrusions. The third protrusion 2113a can support the second disc portion 2511.

[0343] The second protrusion 2512 can be positioned below the second disk portion 2511. Specifically, the second protrusion 2512 can be positioned below the second disk portion 2511 in the third direction (z-axis direction) and can be connected to the second disk portion 2511. A portion of the first protrusion 2512 can be placed in the third hole 2113. The second protrusion 2512 can have a shape protruding towards the image sensor 2900. The width of the second protrusion 2512 (x-axis, y-axis direction) can change towards the optical axis direction. For example, as the second protrusion approaches the image sensor 2900, the width of the second protrusion 2512 can decrease.

[0344] The second extension 2520 can extend in the direction of the optical axis. The second extension 2520 can be positioned parallel to the optical axis and can be connected to the second piezoelectric device 2510. For example, the upper end of the second extension 2520 can be connected to the second protrusion 2512. Moreover, the lower end of the second extension 2520 can be inserted into the lower end of the second outer cover 2100, for example, it can be inserted into the fifth hole (not shown) formed at the lower end of the second sub-outer cover 2120.

[0345] Additionally, a region of the second extension 2520 can be connected to the second lens barrel 2400. For example, the second extension 2520 can be connected to the second lens barrel 2400 via the second elastic portion 2430. Specifically, the second extension 2520 can be positioned between the third elastic member 2431 and the fourth elastic member 2432. More specifically, the second extension 2520 can be positioned between the ninth region 2431c of the third elastic member 2431 and the eleventh region 2432b of the fourth elastic member 2432. The second extension 2520 can be secured by the elastic force of the third elastic member 2431 and the fourth elastic member 2432.

[0346] The second extension 2520 can transmit the vibration generated in the second piezoelectric device 2510 to the second lens barrel 2400. The second lens barrel 2400 can move up or down (in the z-axis direction, optical axis direction) according to the vibration direction of the second extension 2520. As a result, the third lens unit 2405 in the second lens barrel 2400 can move to perform a zoom function of magnification or reduction.

[0347] The third buffer member 2521 can be placed on the second extension 2520. The third buffer member 2521 can be placed on the upper region of the second extension 2520. The third buffer member 2521 can be placed in the third hole 2113 of the second outer cover 2100. For example, the third buffer member 2521 can be placed between the third protrusion 2113a and the fourth protrusion 2113b of the third hole 2113. The third buffer member 2521 can be fixed to the position defined by the third protrusion 2113a and the fourth protrusion 2113b. Additionally, the third buffer member 2521 may include a through hole into which the second extension 2520 is inserted.

[0348] A fourth buffer member 2522 may be placed on the second extension 2520. The fourth buffer member 2522 may be placed on the lower region of the second extension 2520. The fourth buffer member 2522 may be spaced apart from the third buffer member 2521 in the optical axis direction. The fourth buffer member 2522 may be placed in a fifth hole (not shown) of the second outer cover 2100. The fourth buffer member 2522 may be positioned to be inserted into the fifth hole. The second buffer member 2322 may include a through hole for insertion of the second extension 2520.

[0349] The third buffer member 2521 and the fourth buffer member 2522 can prevent noise caused by vibration of the second extension 2520. In addition, the third buffer member 2521 and the fourth buffer member 2522 can prevent the second extension 2520 from being deformed or damaged due to external impact.

[0350] The second camera actuator 2000 may include a first magnetic calibrator 2610, a first sensing unit (not shown), a second magnetic calibrator 2620, and a second sensing unit (not shown).

[0351] The first magnetic calibrator 2610 can be placed on the first lens barrel 2200. For example, the first magnetic calibrator 2610 can be placed on the first lower surface 2223. Specifically, the first magnetic calibrator 2610 can be placed in the first groove 223h1 of the first lens barrel 2200. The first magnetic calibrator 2610 can move together with the first lens barrel 2200 along the optical axis.

[0352] The first magnetic calibrator 2610 may include a plurality of magnets. For example, the first magnetic calibrator 2610 may have N poles and S poles alternately placed in the optical axis direction.

[0353] The first sensing unit can be positioned adjacent to the first magnetic calibrator 2610. For example, the first sensing unit can be positioned facing the first magnetic calibrator 2610 in a first direction (x-axis direction) or a second direction (y-axis direction). The first sensing unit can detect the position of the first magnetic calibrator 2610. Thus, the first sensing unit can detect the position and movement of the first lens barrel 2200 that moves together with the first magnetic calibrator 2610.

[0354] The second magnetic calibrator 2620 can be placed on the second lens barrel 2400. For example, the second magnetic calibrator 2620 can be placed on the second upper surface 2423. Specifically, the second magnetic calibrator 2620 can be placed in the third groove 2423h1 of the second lens barrel 2400. The second magnetic calibrator 2620 can move together with the second lens barrel 2400 along the optical axis.

[0355] The second magnetic calibrator 2620 may include multiple magnets. For example, the second magnetic calibrator 2620 may have N poles and S poles alternately placed in the optical axis direction.

[0356] Furthermore, the second sensing unit can be positioned adjacent to the second magnetic calibrator 2620. For example, the second sensing unit can be positioned facing the second magnetic calibrator 2620 in a first direction (x-axis direction) or a second direction (y-axis direction). The second sensing unit can detect the position of the second magnetic calibrator 2620. Thus, the second sensing unit can detect the position and movement of the second lens barrel 2400 that moves together with the second magnetic calibrator 2620.

[0357] Furthermore, although not shown in the accompanying drawings, the second camera actuator 2000 according to this embodiment may further include a gyroscope sensor (not shown). The gyroscope sensor may be housed within the second housing 2100. The gyroscope sensor can detect movement of the user using the camera actuator.

[0358] The second camera actuator 2000 according to this embodiment may include a second substrate 2800. The second substrate 2800 may be placed on a second outer casing 2100. The second substrate 2800 may be positioned to surround a portion of the second outer casing 2100. For example, the second substrate 2800 may be positioned to surround a portion of the outer side of a second sub-outer casing 2120. The second substrate 2800 may provide power or current to components placed within the second outer casing 2100. That is, the second substrate 2800 may be a circuit board and may include a circuit board having a wiring pattern capable of electrical connection, such as a rigid printed circuit board (rigid PCB), a flexible printed circuit board (flexible PCB), and a rigid-flexible printed circuit board (rigid-flexible PCB). The second substrate 2800 may be electrically connected to the first circuit board 310 described above.

[0359] The second substrate 2800 may include a first end 2810. The first end 2810 may be placed on the first piezoelectric device 2310 of the third driving unit 2300. For example, the first end 2810 may be placed on the first disk portion 2311 of the first piezoelectric device 2310. Specifically, the first end 2810 may be placed on one surface of the first disk portion 2311. Furthermore, the first end 2810 may be placed on the second piezoelectric device 2510 of the fourth driving unit 2500. For example, the first end 2810 may be placed on the second disk portion 2511 of the second piezoelectric device 2510. Specifically, the first end 2810 may be placed on one surface of the second disk portion 2511.

[0360] The second substrate 2800 may include a second end 2820. The second end 2820 may be spaced apart from the first end 2810. Moreover, the second end 2820 may be placed in a region that does not overlap with the first end 2810 in the optical axis direction.

[0361] The second end 2820 can be placed on the first piezoelectric device 2310 of the third drive unit 2300. For example, the second end 2820 can be placed on the first disc portion 2311 of the first piezoelectric device 2310. Specifically, the second end 2820 can be placed on a surface opposite to one surface of the first disc portion 2311. Furthermore, the second end 2820 can be placed on the second piezoelectric device 2510 of the fourth drive unit 2500. For example, the second end 2820 can be placed on the second disc portion 2511 of the second piezoelectric device 2510. Specifically, the second end 2820 can be placed on a surface opposite to one surface of the second disc portion 2511.

[0362] That is, the second substrate 2800 can supply power to the first piezoelectric device 2310 and the second piezoelectric device 2510. Accordingly, the third drive unit 2300 and the fourth drive unit 2500 can drive the first lens barrel 2200 and the second lens barrel 2400 respectively by the applied power.

[0363] As described above, the second camera actuator 2000 according to this embodiment includes a third drive unit 2300 and a fourth drive unit 2500, which include piezoelectric devices and can move the first lens barrel 2200 and the second lens barrel 2400 in the optical axis direction. However, the embodiment is not limited thereto, and the third drive unit 2300 and the fourth drive unit 2500 may include a voice coil motor (VCM) or a shape memory alloy. In this case, the third drive unit 2300 and the fourth drive unit 2500 can move the first lens barrel 2200 and the second lens barrel 2400 by using the electromagnetic force of the VCM or the physical change of the shape memory alloy.

[0364] The second camera actuator 2000 according to this embodiment may include an image sensor 2900. The image sensor 2900 can collect light passing in the order of the first lens unit 2105, the second lens unit 2205, and the third lens unit 2405, and convert it into an image. The image sensor 2900 can be positioned to align with the optical axis of the lenses of lens units 105, 205, and 405. The optical axis of the image sensor 2900 can be aligned with the optical axis of the lenses.

[0365] Figure 38 This is a perspective view of a mobile terminal that uses a camera module according to an embodiment.

[0366] refer to Figure 38 The mobile terminal 3 may include a camera module 10, an autofocus device 31, and a flash module 33 located on the rear side.

[0367] The camera module 10 may include image capture functionality and autofocus functionality. For example, the camera module 10 may include an autofocus function that uses an image.

[0368] The camera module 10 processes image frames of still or moving images acquired by the image sensor in either shooting mode or video call mode. The processed image frames can be displayed on a predetermined display unit and stored in memory. The camera (not shown) can also be positioned on the front of the mobile terminal body.

[0369] For example, camera module 10 may include a first camera module 10A and a second camera module 10B. In this case, at least one of the first camera module 10A and the second camera module 10B may include the camera modules mentioned above, for example, according to... Figures 1 to 20 The camera module 10. Accordingly, the camera module 10 can implement OIS function together with zoom function and autofocus function.

[0370] The autofocus device 31 may include an autofocus function using a laser. The autofocus device 31 may be used primarily under conditions where the autofocus function of the camera module 10 is degraded, such as at close range (10m or less) or in dark environments. The autofocus device 31 may include: a light emitting unit comprising a vertical-cavity surface-emitting laser (VCSEL) semiconductor device; and a light receiving unit that converts light energy into electrical energy using a device such as a photodiode.

[0371] The flash module 33 may include a light emitting device that emits light. The flash module 33 can be operated via the camera of a mobile terminal or via user control.

[0372] then, Figure 39 This is a perspective view of vehicle 5, which utilizes the camera module according to an embodiment. For example, Figure 39 It is an external view of a vehicle including a vehicle driving assistance device with a camera module 10 according to an embodiment.

[0373] refer to Figure 39 The vehicle 5 according to this embodiment may include wheels 53FL and 53RL that rotate via a power source, as well as a predetermined sensor. This sensor may be a camera sensor 51, but is not limited thereto.

[0374] Camera 51 may be an application of a camera module according to an embodiment, such as according to... Figures 1 to 37 The camera sensor of the camera module 10.

[0375] In this embodiment, the vehicle 5 can acquire image information by capturing images of the front or surroundings through a camera sensor 51, and can use the image information to determine if a lane is not recognized, and generate a virtual lane when a lane is not recognized.

[0376] For example, camera sensor 51 can acquire a frontal image by taking a picture of the front of vehicle 5, and processor (not shown) can obtain image information by analyzing the objects included in the frontal image.

[0377] For example, when an object corresponding to a lane, adjacent vehicle, driving obstacle, and indirect road marking (such as a median strip, curb, or roadside tree) is captured in an image captured by camera sensor 51, the processor can detect such an object and include it in the image information.

[0378] In this scenario, the processor can further supplement the image information by acquiring distance information to the object detected by the camera sensor 51. This image information may be information about the object being photographed in the image.

[0379] The camera sensor 51 may include an image sensor and an image processing module. The camera sensor 51 can process still or moving images acquired by the image sensor (e.g., CMOS or CCD). The image processing module can process the still or moving images acquired by the image sensor, extract necessary information, and transmit the extracted information to a processor.

[0380] In this scenario, camera sensor 51 may include a stereo camera to improve the accuracy of object measurement and further ensure information such as the distance between vehicle 5 and the object, but is not limited thereto.

[0381] The features, structures, effects, etc., described in the above embodiments are included in at least one embodiment, and are not necessarily limited to only one embodiment. Furthermore, those skilled in the art to which the embodiments pertain can combine or modify the features, structures, effects, etc., shown in each embodiment for other embodiments. Accordingly, content related to these combinations and variations should be interpreted as being included within the scope of the embodiments.

[0382] The embodiments have been primarily described above; however, these are merely examples and not limiting of the embodiments. Those skilled in the art will understand that various modifications and applications not shown above are possible without departing from the essential characteristics of these embodiments. For example, each component specifically shown in the embodiments can be implemented through modifications. Furthermore, differences relating to these modifications and applications should be interpreted as being included within the scope of the embodiments set forth in the appended claims.

Claims

1. A camera actuator comprising: a housing; a prism unit disposed in the housing; a first driving unit disposed in the housing and controlling tilting of the prism unit; and a second driving unit disposed below the housing and controlling tilting of the housing, wherein the first driving unit includes a first piezoelectric device disposed in an area overlapping a center of the prism unit in a first direction, wherein the second driving unit includes a second piezoelectric device disposed in an area overlapping the center of the prism unit in a second direction different from the first direction, wherein the prism unit is configured to be tiltable in the second direction by the first driving unit, wherein the housing is configured to be tiltable in the first direction by the second driving unit, wherein the housing includes a first side and a partition wall disposed between the first side and the prism unit, wherein the first driving unit includes a first yoke disposed between the first side and the partition wall and a first magnet disposed in the housing between the partition wall and a first outer surface of the prism unit, wherein the first yoke and the first magnet are disposed in an area not overlapping the first piezoelectric device in the first direction, and wherein the prism unit is pressed in a direction toward the partition wall by an attractive force of the first yoke and the first magnet. the housing includes:

2. The camera actuator of claim 1, wherein, a lower portion; a second side extending upward on the lower portion and facing the first side; and an upper portion disposed on the first side and the second side and connecting the first side and the second side, wherein the first piezoelectric device is disposed between the first side and the first outer surface of the prism unit. the first driving unit further includes:

3. The camera actuator of claim 2, wherein, a second yoke disposed between the first side and the partition wall; and a second magnet disposed between the partition wall and the first outer surface, wherein the first piezoelectric device is disposed between the first magnet and the second magnet. the first magnet includes:

4. The camera actuator of claim 3, wherein, a first-first magnet having a first polarity; and a first-second magnet having a second polarity opposite the first polarity, wherein a first sensing unit is disposed between the first magnet and the first yoke, and wherein the first sensing unit is disposed in an area corresponding to a boundary between the first-first magnet and the first-second magnet.

5. The camera actuator according to claim 2, further comprising: a base member disposed below the housing, wherein the second piezoelectric device is disposed between the housing and the base member. ​ 6. The camera actuator of claim 5, wherein, The second driving unit includes: a third yoke disposed on the outer case; and a third magnet disposed between the outer case and the base member, wherein the third yoke and the third magnet are disposed in a region not overlapping the second piezoelectric device in the second direction, and wherein the outer case is pressed in a direction toward the base member by an attractive force of the third yoke and the third magnet.

7. The camera actuator of claim 2, wherein, The first driving unit includes a first elastic member for pressing the prism unit in a direction toward the first piezoelectric device.

8. The camera actuator according to claim 2, further comprising: a first guide protrusion disposed on one side of the partition wall and having a shape protruding toward the prism unit, and wherein the first guide protrusion is disposed in a region overlapping the center of the prism unit in the first direction.

9. The camera actuator of claim 7, wherein, The second driving unit includes a second elastic member for pressing the outer case in a direction toward the second piezoelectric device.

10. The camera actuator of claim 6, wherein, The second driving unit includes: a fourth yoke disposed on the outer case and spaced apart from the third yoke; and a fourth magnet disposed between the outer case and the base member, wherein the second piezoelectric device is disposed between the third magnet and the fourth magnet.

11. The camera actuator according to claim 10, further comprising: a second sensing unit disposed between the third magnet and the third yoke.

12. The camera actuator of claim 1, wherein, The first piezoelectric device is in direct contact with the prism unit, and wherein the second piezoelectric device is in direct contact with the outer case.

13. The camera actuator according to claim 5, further comprising: a second guide protrusion disposed on a lower portion of the outer case and having a shape protruding toward the base member, and wherein the second guide protrusion is disposed in a region overlapping the center of the prism unit in the second direction.

14. A camera module comprising: a first camera actuator; and a second camera actuator; wherein the first camera actuator performs an OIS (Optical Image Stabilizer) function, and wherein the second camera actuator performs an auto focus or a zoom function, wherein the first camera actuator includes: an outer case; a base member disposed below the outer case; a prism unit disposed in the outer case; a first driving unit disposed in the outer case and controlling tilting of the prism unit; and a second driving unit disposed below the outer case and controlling tilting of the outer case, wherein the first driving unit includes a first piezoelectric device disposed in a region overlapping a center of the prism unit in a first direction, wherein the second driving unit includes a second piezoelectric device disposed in a region overlapping the center of the prism unit in a second direction different from the first direction. wherein the second driving unit includes a second piezoelectric device disposed in a region overlapping with the center of the prism unit in a second direction different from the first direction, wherein the prism unit is configured to be tilted in the second direction by the first driving unit, wherein the housing is configured to be tilted in the first direction by the second driving unit, wherein the housing includes a first side portion and a partition wall disposed between the first side portion and the prism unit, wherein the first driving unit includes a first yoke disposed between the first side portion and the partition wall, and a first magnet disposed in the housing between the partition wall and a first outer surface of the prism unit, wherein the first yoke and the first magnet are disposed in a region not overlapping with the first piezoelectric device in the first direction, wherein the prism unit is pressed in a direction toward the partition wall by an attractive force of the first yoke and the first magnet, wherein the second driving unit includes a third yoke disposed on the housing, and a third magnet disposed between the housing and the base member, wherein the third yoke and the third magnet are disposed in a region not overlapping with the second piezoelectric device in the second direction, and wherein the housing is pressed in a direction toward the base member by an attractive force of the third yoke and the third magnet.

15. The camera module of claim 14, wherein, The housing includes: a lower portion, a second side portion extending upward on the lower portion and facing the first side portion; and an upper portion disposed on the first side portion and the second side portion and connecting the first side portion and the second side portion; wherein the first piezoelectric device is disposed between the first side portion and the first outer surface of the prism unit.

16. The camera actuator of claim 15, the first driving unit further includes: a second yoke disposed between the first side portion and the partition wall and spaced apart from the first yoke; and a second magnet disposed between the partition wall and the first outer surface and spaced apart from the first magnet, wherein the second yoke and the second magnet are disposed in a region not overlapping with the first piezoelectric device in the first direction, and wherein the prism unit is pressed in the direction toward the partition wall by an attractive force of the second yoke and the second magnet, wherein the first piezoelectric device is disposed between the first magnet and the second magnet. The second driving unit further includes:

17. The camera actuator of claim 15, wherein, a fourth yoke disposed on the housing and spaced apart from the third yoke; and a fourth magnet disposed between the housing and the base member, ​ wherein the fourth yoke and the fourth magnet are disposed in a region that does not overlap the second piezoelectric device in the second direction, wherein the housing is pressed in the direction toward the base member by an attractive force of the fourth yoke and the fourth magnet.

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