Camera Module

Abstract

The camera module includes a housing, a bearing portion, a frame, a lens holder, an auto focus (AF) ball holder, and an optical image stabilization (OIS) ball holder. The bearing portion is connected to the housing and is configured to move in the optical axis direction. The frame is connected to the bearing portion and is configured to move in a first axis direction perpendicular to the optical axis direction. The lens holder is connected to the frame and is configured to move in a second axis direction perpendicular to the optical axis direction and the first axis direction. The AF ball holder is arranged between the housing and the bearing portion. The OIS ball holder is arranged on one or both of the bearing portion and the frame and on one or both of the frame and the lens holder. One or both of the AF ball holder and the OIS ball holder have an elastic modulus of 20 GPa or less.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2020-0124592 filed on September 25, 2020, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety for all purposes by reference. Technical Field

[0003] The present disclosure relates to a camera module. Background Art

[0004] Cameras are now commonly installed in portable electronic devices such as smartphones, tablet PCs, notebook computers, etc. An auto focus function, an optical image stabilization function, a zoom function, etc. are generally added to the camera of the mobile terminal.

[0005] A ball-type actuator is generally used as a driver to implement auto focus (AF) and optical image stabilization (OIS). The ball-type actuator supports a driving body using a plurality of ball bearings.

[0006] However, on the surface of the driving body, that is, on the surface of the rolling unit of the ball bearing, damage caused by the ball bearing due to external impact may occur. Summary of the invention

[0007] The purpose of providing this summary is to introduce a selection of inventive concepts in a concise form, and these inventive concepts will be further described in the following detailed description. This summary is not intended to identify the key features or essential features of the subject matter claimed, nor is it intended to help determine the scope of the subject matter claimed.

[0008] In a general aspect, a camera module includes a housing, a bearing portion, a frame, a lens holder, an auto focus (AF) ball holder, and an optical image stabilization (OIS) ball holder. The bearing portion is connected to the housing and is configured to move in an optical axis direction. The frame is connected to the bearing portion and is configured to move in a first axis direction perpendicular to the optical axis direction. The lens holder is connected to the frame and is configured to move in a second axis direction perpendicular to the optical axis direction and the first axis direction. The AF ball holder is disposed between the housing and the bearing portion. The OIS ball holder is disposed on one or both of the bearing portion and the frame and on one or both of the frame and the lens holder. One or both of the AF ball holder and the OIS ball holder have an elastic modulus of 20 GPa or less and include a polymer material.

[0009] One or both of the AF ball bearing and the OIS ball bearing may be made of an organic polymer material.

[0010] One or both of the AF ball bearing and the OIS ball bearing may be made of a thermoplastic or thermosetting polymer material.

[0011] One or both of the AF ball bearing and the OIS ball bearing may be made of a polymer material containing an inorganic filler.

[0012] The camera module may further include a focus adjustment coil disposed on one surface of the housing, and a focus adjustment magnet disposed on the bearing portion and disposed opposite to the focus adjustment coil. The AF ball bearing may be disposed on both sides of the focus adjustment coil and the focus adjustment magnet.

[0013] The AF ball bearing may include a plurality of AF ball bearings provided on both sides of the focus adjustment coil and the focus adjustment magnet.

[0014] The AF ball bearing may include a first AF ball bearing and a second AF ball bearing, the second AF ball bearing having a smaller size than the first AF ball bearing.

[0015] A predetermined number of first AF ball bearings and second AF ball bearings may be disposed on one side of the focus adjustment coil and the focus adjustment magnet, respectively.

[0016] The predetermined number of the first AF ball bearing and the second AF ball bearing may be four.

[0017] An equal number of first AF ball bearings and second AF ball bearings may be provided on one side of the focus adjustment coil and the focus adjustment magnet.

[0018] A predetermined number of first AF ball bearings and second AF ball bearings may be respectively disposed on the other side of the focus adjustment coil and the focus adjustment magnet.

[0019] The predetermined number of the first AF ball bearing and the second AF ball bearing may be four.

[0020] An equal number of first AF ball bearings and second AF ball bearings may be provided on the other side of the focus adjustment coil and the focus adjustment magnet.

[0021] The OIS ball bearing may include a first ball member disposed between the bearing portion and the frame, and a second ball member disposed between the frame and the lens holder.

[0022] The first ball member may include a plurality of first ball members, and the second ball member may include a plurality of second ball members. The plurality of first ball members may be arranged on the upper surface of the bearing portion and on the corners of the bottom surface of the frame, and the plurality of second ball members may be arranged on the upper surface of the frame and on the corners of the bottom surface of the lens holder.

[0023] Other features and aspects will become apparent from the following detailed description, the accompanying drawings, and the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view showing a camera of a sensing device according to one or more embodiments of the present disclosure.

[0025] Figure 2 is an exploded perspective view showing a camera of a sensing device according to one or more embodiments of the present disclosure.

[0026] Figure 3 is an enlarged exploded perspective view showing a focus adjustment unit provided in a camera module according to a first embodiment of the present disclosure.

[0027] Figure 4 is along Figure 1 A cross-sectional view taken along line AA'.

[0028] Figure 5 is an enlarged exploded perspective view showing a shake correction unit provided in a camera module according to a first embodiment of the present disclosure.

[0029] Figure 6 is a graph showing the degree of damage caused by the ball bearing according to the elastic modulus of the ball bearing.

[0030] Throughout the drawings and detailed description, the same reference numerals refer to the same elements. For purposes of clarity, illustration, and convenience, the drawings may not be drawn to scale, and the relative sizes, proportions, and depictions of elements in the drawings may be exaggerated. DETAILED DESCRIPTION

[0031] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the method, device and / or system described in this application. However, various changes, modifications and equivalences of the method, device and / or system described in this application will be apparent after understanding the disclosure of this application. For example, the order of operations described in this application is merely an example, and except for the operations that must occur in a specific order, it is not limited to the order set forth in this application, but can be changed, which will be apparent after understanding the disclosure of this application. In addition, for greater clarity and brevity, the description of features known in the art may be omitted.

[0032] The features described in this application can be implemented in different forms and should not be understood as being limited to the examples described in this application. Rather, the examples described in this application are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described in this application that will be apparent after understanding the disclosure of this application.

[0033] Throughout the specification, when an element such as a layer, a region, or a substrate is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, no other elements may be present between the element and the other element.

[0034] As used in this application, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0035] Although the terms "first", "second" and "third" may be used in this application to describe various members, components, regions, layers or parts, these members, components, regions, layers or parts are not limited by these terms. More specifically, these terms are only used to distinguish one member, component, region, layer or part from another member, component, region, layer or part. Therefore, without departing from the teachings of the examples described in this application, the first member, first component, first region, first layer or first part mentioned in these examples may also be referred to as the second member, second component, second region, second layer or second part.

[0036] Spatially relative terms such as "above", "higher", "below", and "lower" may be used in this application for descriptive convenience to describe the relationship of one element relative to another element as shown in the accompanying drawings. In addition to covering the orientations depicted in the accompanying drawings, these spatially relative terms are intended to also cover different orientations of the device in use or operation. For example, if the device in the accompanying drawings is flipped, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" covers both orientations of "above" and "below". The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used in this application should be interpreted accordingly.

[0037] The terms used in this application are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the articles "a", "an" and "the" are intended to also include plural forms. The words "include", "comprise" and "have" indicate the presence of the features, numbers, operations, components, elements and / or their combinations, but do not exclude the presence or addition of one or more other features, numbers, operations, components, elements and / or their combinations.

[0038] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described in the present application are not limited to the specific shapes shown in the drawings, but include variations in shapes that occur during manufacturing.

[0039] The features of the examples described in this application can be combined in various ways that will be apparent after understanding the disclosure of this application. In addition, although the examples described in this application have multiple configurations, other configurations that will be apparent after understanding the disclosure of this application are also possible.

[0040] An aspect of the present disclosure is to provide a camera module for preventing a ball bearing from damaging a surface of a rolling portion.

[0041] Figure 1 is a perspective view showing a camera of a sensing device according to one or more embodiments of the present disclosure, and Figure 2 is an exploded perspective view showing a camera of a sensing device according to one or more embodiments of the present disclosure.

[0042] exist Figure 1 and Figure 2 , the camera 200 may include a housing 210 , a shield case 220 , a lens barrel 230 , a lens driving device 240 , and an image sensor unit 270 .

[0043] The housing 210 may be formed to have an internal space in which the lens barrel 230 and the lens drive device 240 may be accommodated. As an example, the housing 210 may have a hexahedral box shape with six opening surfaces. In addition, the housing 210 may be made of a plastic material. As an example, the bottom surface of the housing 210 may be open for the image sensor unit 270, and the four sides of the housing 210 may be open for the installation of the lens drive device 240.

[0044] The shielding shell 220 is connected to the housing 210 to surround the outer surface of the housing 210 and is used to protect the internal components of the camera 200. In addition, the shielding shell 220 can perform the function of shielding electromagnetic waves. For example, the shielding shell 220 can shield electromagnetic waves so that the electromagnetic waves generated by the camera 200 do not affect other electronic components in the portable electronic device.

[0045] The shield case 220 may be made of a metal material and may be grounded to a ground pad provided on a printed circuit board 274 of an image sensor unit 270 to be described later, thereby shielding electromagnetic waves.

[0046] However, the present disclosure is not limited thereto, and the shielding shell 220 may also be formed of an injection molded product. In this case, a conductive paint may be applied to the inner surface of the shielding shell 220, or a conductive film or conductive tape may be attached to the inner surface of the shielding shell 220 to shield electromagnetic waves. In this case, a conductive epoxy resin may be used as the conductive paint, but the present disclosure is not limited thereto, and various materials having conductivity may be used.

[0047] The lens barrel 230 may have a hollow cylindrical shape. A plurality of lenses for imaging an object may be accommodated in the lens barrel 230, and the plurality of lenses are installed in the lens barrel 230 along the optical axis (Z axis). According to the design of the lens barrel 230, a necessary plurality of lenses are provided in the lens barrel 230, and each of the lenses has optical properties such as the same or different refractive indexes.

[0048] The lens driving device 240 is a device configured to move the lens barrel 230. As an example, the lens driving device 240 can adjust the focus by moving the lens barrel 230 in the optical axis (Z axis) direction, and correct the shake during capture by moving the lens barrel 230 in a direction intersecting the optical axis (Z axis) direction. The lens driving device 240 includes a focus adjustment unit 250 configured to adjust the focus, and a shake correction unit 260 configured to correct the shake. The detailed description of the focus adjustment unit 250 and the shake correction unit 260 will be further described later.

[0049] The image sensor unit 270 converts light incident through the lens barrel 230 into an electrical signal. For example, the image sensor unit 270 may include an image sensor 272 and a printed circuit board 274, and may further include an infrared filter (not shown). The image sensor 272 may be mounted on the printed circuit board 274, and the infrared filter (not shown) is used to block light in the infrared spectrum incident through the lens barrel 230 from entering the image sensor 272. The image sensor 272 converts light incident through the lens barrel 230 into an electrical signal. For example, the image sensor 272 may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0050] The electrical signal converted by the image sensor 272 is ultimately transmitted to an advanced driver assistance system (ADAS). The image sensor 272 is fixed to the printed circuit board 274 and electrically connected to the printed circuit board 274 by wire bonding.

[0051] Hereinafter, the lens driving apparatus will be described in more detail with reference to the accompanying drawings.

[0052] Figure 3 is an enlarged exploded perspective view showing a focus adjustment unit provided in a camera module according to a first embodiment of the present disclosure. Figure 4 is along Figure 1 A cross-sectional view taken along line AA'.

[0053] exist Figure 3 and Figure 4 In the embodiment, the lens driving device 240 (see Figure 2 ) Move the lens barrel 230 (see Figure 2 ) to focus on the subject.

[0054] For example, in the present disclosure, the focus adjustment unit 250 is used to move the lens barrel 230 in the optical axis (Z axis) direction. The focus adjustment unit 250 includes a bearing portion 251 that accommodates the lens barrel 230 and a focus adjustment driving unit 252. The focus adjustment driving unit 252 generates a driving force to move the lens barrel 230 and the bearing portion 251 in the optical axis (Z axis) direction.

[0055] The focus adjustment driving unit 252 includes a focus adjustment magnet 253 installed in any one of the bearing portion 251 and the housing 210 , and a focus adjustment coil 254 disposed opposite to the focus adjustment magnet 253 .

[0056] The focus adjustment magnet 253 is mounted on the carrier 251. As an example, the focus adjustment magnet 253 may be mounted on one surface of the carrier 251.

[0057] The focus adjustment coil 254 is mounted on the housing 210. For example, the focus adjustment coil 254 may be mounted on the housing 210 through a substrate 212.

[0058] The focus adjustment magnet 253 is a moving component that is mounted on the carrier 251 and moves in the optical axis (Z-axis) direction together with the carrier 251. The focus adjustment coil 254 is a fixed member fixed to the housing 210. However, the present disclosure is not limited thereto, and the installation positions of the focus adjustment magnet 253 and the focus adjustment coil 254 may also be changed.

[0059] Furthermore, when power is applied to the focus adjustment coil 254 , the carrier 251 may move in the optical axis (Z-axis) direction due to electromagnetic influence between the focus adjustment magnet 253 and the focus adjustment coil 254 .

[0060] Since the lens barrel 230 is accommodated in the carrying portion 251 , the lens barrel 230 also moves in the optical axis (Z-axis) direction by the movement of the carrying portion 251 .

[0061] When the bearing portion 251 moves, an auto focus (AF) ball bearing 280 is disposed between the bearing portion 251 and the housing 210 to reduce friction between the bearing portion 251 and the housing 210. The AF ball bearing 280 may have a spherical shape.

[0062] In addition, the AF ball bearing 280 may include a plurality of AF ball bearings disposed on both sides of the focus adjustment magnet 253. For example, the plurality of AF ball bearings 280 may be disposed to form a row on both sides of the focus adjustment magnet 253.

[0063] In a non-limiting example, four AF ball bearings 280 may be disposed on each of both sides of the focus adjustment magnet 253. In addition, the AF ball bearings 280 may include a first AF ball bearing 280a and a second AF ball bearing 280b having a size smaller than that of the first AF ball bearing 280a. As an example, four ball bearings may be disposed on one side of the focus adjustment magnet 253 in the order of the first AF ball bearing 280a, the second AF ball bearing 280b, the second AF ball bearing 280b, and the first AF ball bearing 280a. As an example, four ball bearings may be disposed on the other side of the focus adjustment magnet 253 in the order of the second AF ball bearing 280b, the first AF ball bearing 280a, the first AF ball bearing 280a, and the second AF ball bearing 280b. However, the present disclosure is not limited thereto, and the number and size of the AF ball bearings 280 may be variously changed.

[0064] The AF ball bearing 280 may be made of a material having elasticity so as to prevent the AF ball bearing 280 from damaging the bearing portion 251 and the housing 210 due to external impact. As an example, the AF ball bearing 280 may include a polymer material. In addition, the AF ball bearing 280 may have an elastic modulus of 20 GPa or less.

[0065] For example, the AF ball bearing 280 may be an organic polymer material, and may be a thermoplastic or thermosetting organic polymer material.

[0066] In addition, the AF ball bearing 280 can be made of a polymer material containing an inorganic filler. In this case, the polymer is 30% or less based on the mass of the composition. Its size is less than 5 μm, and the major axis / minor axis ratio of the isotropic material does not exceed 1:2, which will maintain the spherical shape of the ball bearing.

[0067] As an example, the AF ball bearing 280 may be made of any one of polyurethane (PU), polyimide (PI), and epoxy resin, which are thermoplastic organic polymer materials.

[0068] Alternatively, the AF ball bearing 280 can be made of any one of polystyrene (PS), polymethyl methacrylate (PMMA), polyacetal (POM), polytetrafluoroethylene (PTFE), acrylic resin (Acrylic), ABS, polycarbonate (PC), polybutylene terephthalate (PBT) and PEEK single resin, which are thermosetting organic polymer materials.

[0069] The AF ball bearing 280 may have a heat deformation temperature of 80° C. or higher.

[0070] Therefore, even if the AF ball bearing 280 applies an impact to the bearing portion 251 and the housing 210 during an external impact, it is possible to prevent the surface deformation of the bearing portion 251 and the housing 210 due to the AF ball bearing 280. It is possible to prevent the AF ball bearing 280 from generating scratches and the like on the surfaces of the bearing portion 251 and the housing 210. Therefore, it is possible to prevent the occurrence of a driving failure of the bearing portion 251 due to the surface deformation.

[0071] The details will be described later.

[0072] The focus adjustment yoke 214 is provided in the housing 210. As an example, the focus adjustment yoke 214 is provided to face the focus adjustment magnet 253, and the focus adjustment coil 254 is located between the focus adjustment yoke 214 and the focus adjustment magnet 253.

[0073] The attractive force acts between the focus adjustment yoke 214 and the focus adjustment magnet 253 in a direction perpendicular to the optical axis (Z axis). Therefore, the AF ball bearing 280 can maintain the contact state with the bearing portion 251 and the housing 210 by the attractive force between the focus adjustment yoke 214 and the focus adjustment magnet 253.

[0074] In addition, the focus adjustment yoke 214 is also used to focus the magnetic force of the focus adjustment magnet 253. Therefore, the occurrence of leakage magnetic flux can be reduced. For example, the focus adjustment yoke 214 and the focus adjustment magnet 253 form a magnetic circuit. In this case, the length of the focus adjustment yoke 214 in the optical axis (Z axis) direction can be longer than the length of the focus adjustment magnet 253 in the optical axis (Z axis) direction.

[0075] The focus adjustment unit 250 further includes a focus adjustment sensing unit 255 provided in a region other than the surface on which the focus adjustment magnet 253 and the focus adjustment coil 254 are mounted.

[0076] As an example, the focus adjustment sensing unit 255 includes a first focus adjustment sensing unit 256 disposed at an upper end portion of the housing 210 , and a second focus adjustment sensing unit 257 disposed to be spaced apart from a lower portion of the first focus adjustment sensing unit 256 .

[0077] In addition, as in Figure 5 As shown in more detail in FIG. 1 , a ball member provided in a shake correction unit 260 to be described later may be provided between the first focus adjustment sensing unit 256 and the second focus adjustment sensing unit 257 .

[0078] The first focus adjustment sensing unit 256 includes a first focus adjustment sensing yoke 256 a mounted on the upper end portion of the housing 210 and a first focus adjustment sensing coil 256 b disposed opposite to the first focus adjustment sensing yoke 256 a .

[0079] In addition, the second focus adjustment sensing unit 257 includes a second focus adjustment sensing yoke 257a installed on the lower end portion of the housing 210 and a second focus adjustment sensing coil 257b disposed opposite to the second focus adjustment sensing yoke 257a.

[0080] In addition, the second focus adjustment sensing unit 257 may further include a connection substrate 257c connected to the substrate 212 to which the focus adjustment coil 254 is connected. In addition, the first focus adjustment sensing unit 256 may be connected to the connection unit 212a of the substrate 212.

[0081] Furthermore, since the first focus adjustment sensing unit 256 and the second focus adjustment sensing unit 257 differ only in installation positions, only the first focus adjustment sensing unit 256 will be described below, and a detailed description of the second focus adjustment sensing unit 257 will be omitted.

[0082] The first focus adjustment sensing coil 256b may include at least two or more coils. The inductance of the first focus adjustment sensing coil 256b may be changed according to the displacement of the first focus adjustment sensing yoke 256a.

[0083] Furthermore, in the present disclosure, a closed-loop control method is used to sense and feed back the position of the lens barrel 230. Therefore, a focus adjustment sensing unit 255 for closed-loop control is provided.

[0084] Looking at the closed-loop control in more detail, when the power of the camera 200 is turned on, the initial position of the lens barrel 230 is sensed by the focus adjustment sensing unit 255. Then, the lens barrel 230 moves from the sensed initial position to the initial setting position. Here, the initial position may refer to the position of the lens barrel 230 in the optical axis direction when the camera 200 is turned on, and the initial setting position may refer to the position where the focus of the lens barrel 230 becomes infinite.

[0085] The lens barrel 230 is moved from an initial setting position to a target position by a driving signal of a circuit element.

[0086] During the focus adjustment process, the lens barrel 230 may move forward and backward in the optical axis (Z-axis) direction (ie, the lens barrel 230 may move in two directions).

[0087] Figure 5 is an enlarged exploded perspective view showing a shake correction unit provided in a camera module according to a first embodiment of the present disclosure.

[0088] The shake correction unit 260 is used to correct image blur or moving image shake caused by factors such as vibration during image capture or moving image capture. For example, when shake occurs during image capture due to vibration, etc., the shake correction unit 260 compensates for the shake by applying a relative displacement corresponding to the shake to the lens barrel 230. As an example, the shake correction unit 260 corrects the shake by moving the lens barrel 230 in a direction perpendicular to the optical axis (Z axis).

[0089] exist Figure 5 , the shake correction unit 260 includes a guide member 261 that guides movement of the lens barrel 230, and a shake correction driving unit 264 that generates a driving force to move the guide member 261 in a direction perpendicular to the optical axis (Z axis).

[0090] The guide member 261 includes a frame 262 and a lens holder 263. The frame 262 and the lens holder 263 are inserted into the bearing portion 251 and disposed along the optical axis (Z axis) direction, and serve to guide the movement of the lens barrel 230.

[0091] The frame 262 and the lens holder 263 have a space into which the lens barrel 230 can be inserted. The lens barrel 230 is fixed to the lens holder 263.

[0092] The frame 262 and the lens holder 263 are moved in the bearing portion 251 in a direction perpendicular to the optical axis (Z axis) by a driving force generated by the shake correction driving unit 264 .

[0093] The shake correction drive unit 264 includes a first shake correction drive unit 265 and a second shake correction drive unit 266, wherein the first shake correction drive unit 265 generates a driving force in the direction of a first axis (X axis) perpendicular to the optical axis (Z axis), and the second shake correction drive unit 266 generates a driving force in the direction of a second axis (Y axis) perpendicular to both the optical axis (Z axis) and the first axis (X axis).

[0094] The first shake correction driving unit 265 generates a driving force in the direction of a first axis (X axis) perpendicular to the optical axis (Z axis). The second shake correction driving unit 266 generates a driving force in the direction of a second axis (Y axis) perpendicular to the first axis (X axis).

[0095] Here, the second axis (Y axis) refers to an axis perpendicular to both the optical axis (Z axis) and the first axis (X axis).

[0096] The first shake correction driving unit 265 and the second shake correction driving unit 266 are arranged to be orthogonal to each other. As an example, the first shake correction driving unit 265 and the second shake correction driving unit 266 are arranged to be orthogonal to each other in a plane perpendicular to the optical axis (Z axis).

[0097] As an example, the first shake correction driving unit 265 includes a first shake correction magnet 265 a mounted on any one of the frame 262 and the housing 210 , and a first shake correction coil 265 b disposed opposite to the first shake correction magnet 265 a .

[0098] The second shake correction driving unit 266 includes a second shake correction magnet 266 a installed in any one of the frame 262 and the housing 210 , and a second shake correction coil 266 b disposed opposite to the second shake correction magnet 266 a .

[0099] In addition, the first shake correction magnet 265a and the second shake correction magnet 266a are mounted on the lens holder 263, and the first shake correction coil 265b and the second shake correction coil 266b disposed opposite to the first shake correction magnet 265a and the second shake correction magnet 266a are mounted on the housing 210. As an example, the first shake correction coil 265b and the second shake correction coil 266b are mounted on the housing 210 through the substrate 212.

[0100] The first shake correction magnet 265a and the second shake correction magnet 266a are moving parts that move in a direction perpendicular to the optical axis (Z axis) together with the lens holder 263. The first shake correction coil 265b and the second shake correction coil 266b are fixed parts fixed to the housing 210. However, the present disclosure is not limited thereto, and the positions of the first shake correction magnet 265a and the second shake correction magnet 266a and the first shake correction coil 265b and the second shake correction coil 266b may also be changed.

[0101] The shake correction unit 260 also includes a shake correction sensing sensor unit 267 including a shake correction sensing yoke 268 installed in the lens holder 263 and a shake correction sensing coil 269 disposed opposite to the shake correction sensing yoke 268 .

[0102] As an example, the shake correction sensing sensor unit 267 may be provided on a surface orthogonal to one surface of the carrier 251 on which the focus adjustment magnet 253 is mounted.

[0103] Furthermore, the shake correction sensing coil 269 is mounted on the housing 210 via the substrate 212. The shake correction sensing coil 269 is a fixed member, and the shake correction sensing yoke 268 is a moving member.

[0104] In the lens driving device 240 of the present disclosure, a closed loop control method is used in which the position of the lens barrel 230 is sensed and fed back during the shake correction process. For this purpose, the shake correction sensing sensor unit 267 described above is provided.

[0105] Looking at the closed-loop control in more detail, when the power of the camera 200 is turned on, the initial position of the lens barrel 230 is sensed by the shake correction sensing sensor unit 267. The lens barrel 230 moves from the sensed initial position to the initial setting position. Here, the initial setting position may refer to the center of the movable range on the first axis (X axis) and the center of the movable range on the second axis (Y axis). Physically, the initial setting position may refer to the center in the first axis (X axis) direction and the center in the second axis (Y axis) direction of the bearing portion 251 in which the shake correction unit 260 is accommodated.

[0106] In addition, a plurality of OIS ball supports 281 are provided to support the shake correction unit 260. The plurality of OIS ball supports 281 are used to guide the frame 262 and the lens holder 263 during the shake correction process. In addition, the plurality of OIS ball supports 281 can also be used to maintain a gap between the bearing portion 251, the frame 262 and the lens holder 263.

[0107] The plurality of OIS ball bearings 281 include a first ball member 282 and a second ball member 284 .

[0108] The first ball member 282 guides movement of the shake correction unit 260 in the first axis (X axis) direction, and the second ball member 284 guides movement of the shake correction unit 260 in the second axis (Y axis) direction.

[0109] For example, when a driving force is generated in the first axis (X axis) direction, the first ball member 282 rolls in the first axis (X axis) direction. Therefore, the first ball member 282 guides the movement of the frame 262 and the lens holder 263 in the first axis (X axis) direction.

[0110] In addition, when a driving force is generated in the second axis (Y axis) direction, the second ball member 284 rolls in the second axis (Y axis) direction. Therefore, the second ball member 284 guides the movement of the lens holder 263 in the second axis (Y axis) direction.

[0111] The first ball member 282 includes a plurality of ball members disposed between the bearing portion 251 and the frame 262, and the second ball member 284 includes a plurality of ball members disposed between the frame 262 and the lens holder 263. As an example, a plurality of first ball members may be disposed on a corner of an upper surface of the bearing portion 251 and a bottom surface of the frame 262, and a plurality of second ball members may be disposed on a corner of an upper surface of the frame 262 and a bottom surface of the lens holder 263.

[0112] The plurality of OIS ball supports 281 may be made of a material having elasticity to prevent damage to the bearing portion 251, the frame 262, and the lens holder 263 caused by the plurality of OIS ball supports 281 due to external impact. As an example, the OIS ball supports 281 may include a polymer material. In addition, the OIS ball supports 281 may have an elastic modulus of 20 GPa or less.

[0113] For example, the OIS ball bearing 281 may be made of an organic polymer, and may be made of a thermoplastic or thermosetting organic polymer.

[0114] The OIS ball bearing 281 may be made of a polymer material containing an inorganic filler. In this case, the polymer is 30% or less based on the mass of the composition, its size is less than 5 μm, and the major axis / minor axis ratio of the isotropic material does not exceed 1:2, which will maintain the spherical shape of the ball bearing.

[0115] As an example, the OIS ball bearing 281 may be made of any one of polyurethane (PU), polyimide (PI), and epoxy resin, which are thermoplastic organic polymer materials.

[0116] Alternatively, the OIS ball bearing 281 can be made of any one of polystyrene (PS), polymethyl methacrylate (PMMA), polyacetal (POM), polytetrafluoroethylene (PTFE), acrylic resin (Acrylic), ABS, polycarbonate (PC), polybutylene terephthalate (PBT) and PEEK single resin, which are thermosetting organic polymer materials.

[0117] The OIS ball bearing 281 may have a heat deformation temperature of 80° C. or higher.

[0118] Therefore, even if the plurality of OIS ball supports 281 applies an impact to the bearing portion 251, the frame 262, and the lens holder 263 during an external impact, it is possible to prevent the bearing portion 251, the frame 262, and the lens holder 263 from being deformed on the surface due to the plurality of OIS ball supports 281. That is, it is possible to prevent scratches and the like from being generated on the surfaces of the bearing portion 251, the frame 262, and the lens holder 263 by the plurality of OIS ball supports 281. As a result, it is possible to prevent the occurrence of a driving failure of the frame 262 and the lens holder 263 due to the surface deformation.

[0119] In addition, in the present disclosure, the stopper 290 is provided to prevent the plurality of OIS ball bearings 281, the frame 262, and the lens holder 263 from being separated to the outside of the bearing portion 251 due to external impact or the like (see Figure 2 ).

[0120] Figure 6 is a graph showing the degree of damage caused by the ball bearing according to the elastic modulus of the ball bearing.

[0121] Here, reference Figure 6 , observing the degree of damage to the object according to the elastic modulus of the ball bearing, when the elastic modulus of the ball bearing is 20 GPa or more, it can be seen that when the impact is applied by the ball bearing, the depth of the depression generated in the object increases rapidly. That is, when the elastic modulus of the ball bearing is 20 GPa or less, it can be seen that the depth of the depression generated in the object according to the elastic modulus of the ball bearing remains constant, but when the elastic modulus of the ball bearing is 20 GPa or more, the depth of the depression generated in the object increases rapidly.

[0122] Therefore, conventionally, since the ball bearing is made of a ceramic material, during an external impact, the ball bearing is subjected to an impact on an object (eg, the housing 210 (see Figure 2 ), the bearing portion 251 (see Figure 2 ), frame 262 (see Figure 2 ) and lens holder 263 (see Figure 2 )) surface defects such as scratches are generated in the substrate, thereby causing poor driving of the bearing portion 251, the frame 262 and the lens holder 263.

[0123] However, as described above, since the elastic modulus of the ball bearing is 20 GPa or less and it is made of a material including a polymer, surface defects such as scratches are not generated in the bearing portion 251, the frame 262, and the lens holder 263. Therefore, the occurrence of driving failures of the bearing portion 251, the frame 261, and the lens holder 263 can be prevented.

[0124] As described above, there is an effect that damage to the surface of the rolling portion caused by the ball bearing can be prevented.

[0125] Although the present disclosure includes specific examples, it will be apparent after understanding the disclosure of the present application that various changes in form and detail may be made to these examples without departing from the spirit and scope of the claims and their equivalents. The examples described in the present application should be understood only in a descriptive sense, and not for limiting purposes. The description of the features or aspects in each example should be understood to be applicable to similar features or aspects in other examples. If the described techniques are performed in a different order, and / or if the components in the described systems, architectures, devices, or circuits are combined in different ways and / or replaced or supplemented by other components or their equivalents, appropriate results can still be achieved. Therefore, the scope of the present disclosure is not limited by specific embodiments, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents should be understood to be included in the present disclosure.

Claims

1. Camera module, including: case; a bearing portion coupled to the housing and configured to move in the optical axis direction; a frame coupled to the bearing portion and configured to move in a first axis direction perpendicular to the optical axis direction; a lens holder coupled to the frame and configured to move in a second axis direction perpendicular to the optical axis direction and the first axis direction; A focus adjustment coil is disposed on a surface of the housing; A focus adjustment magnet, disposed on the bearing portion and arranged opposite to the focus adjustment coil; an autofocus ball support disposed between the housing and the bearing portion on both sides of the focus adjustment coil and the focus adjustment magnet; as well as an optical image stabilization ball support, arranged on one or both of the bearing portion and the frame and on one or both of the frame and the lens holder, wherein one or both of the auto focus ball support and the optical image stabilization ball support have an elastic modulus of 20 GPa or less and comprise a polymer material, and Wherein, the automatic focus ball support includes a first automatic focus ball support and a second automatic focus ball support, the size of the second automatic focus ball support is smaller than the size of the first automatic focus ball support, the number of the first automatic focus ball support and the second automatic focus ball support arranged on one side of the focus adjustment coil and the focus adjustment magnet is equal to the number of the first automatic focus ball support and the second automatic focus ball support arranged on the other side of the focus adjustment coil and the focus adjustment magnet, and the number of the first automatic focus ball support and the second automatic focus ball support arranged on the same side of the focus adjustment coil and the focus adjustment magnet are equal to each other.

2. The camera module according to claim 1, wherein: One or both of the auto focus ball bearing and the optical image stabilization ball bearing are made of an organic polymer material.

3. The camera module according to claim 2, wherein: One or both of the auto focus ball bearing and the optical image stabilization ball bearing are made of a thermoplastic polymer material or a thermosetting polymer material.

4. The camera module according to claim 1, wherein: One or both of the auto focus ball bearing and the optical image stabilization ball bearing are made of a polymer material containing an inorganic filler.

5. The camera module according to claim 1, wherein: A predetermined number of the first auto focus ball bearings and the second auto focus ball bearings are respectively disposed on one side of the focus adjustment coil and the focus adjustment magnet.

6. The camera module according to claim 5, wherein: The predetermined number of the first auto focus ball bearing and the second auto focus ball bearing is four.

7. The camera module according to claim 5, wherein: A predetermined number of the first auto focus ball bearings and the second auto focus ball bearings are respectively disposed on the other side of the focus adjustment coil and the focus adjustment magnet.

8. The camera module according to claim 7, wherein: The predetermined number of the first auto focus ball bearing and the second auto focus ball bearing is four.

9. The camera module according to claim 1, wherein: The optical image stabilization ball support includes a first ball member disposed between the bearing portion and the frame, and a second ball member disposed between the frame and the lens holder.

10. The camera module according to claim 9, wherein: The first ball member includes a plurality of first ball members, and the second ball member includes a plurality of second ball members, The plurality of first ball members are disposed on corners of an upper surface of the bearing portion and a bottom surface of the frame, and The plurality of second ball members are disposed on corners of an upper surface of the frame and a bottom surface of the lens holder.

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