Lens driving device and camera module including the same

Abstract

A lens driving device and a camera module including the lens driving device are provided. The lens driving device includes: a shake compensation unit configured to move in a direction perpendicular to an optical axis; and a plurality of ball members supporting the shake compensation unit so that a degree of freedom of one of the plurality of ball members is different from a degree of freedom of another of the plurality of ball members.

Description

[0001] This application is a divisional application of the invention patent application "Lens driving device and camera module including the lens driving device" with application date of June 23, 2016 and application number 201610461745.7. Technical Field

[0002] The following description relates to a lens driving device and a camera module including the lens driving device. Background Art

[0003] The use of ultra-small camera modules in mobile communication terminals (eg, smartphones, tablet PCs, notebook computers, etc.) has recently increased.

[0004] As mobile communication terminals are miniaturized, the quality of images obtained through these terminals deteriorates because these terminals are often held hand-held when capturing images. In order to obtain clear images despite the instability introduced into the images due to unintentional shaking of the hand holding the terminal, a technology for compensating for the effects of shaking is required.

[0005] An actuator for optical image stabilization (OIS) can be used to compensate for unintentional shaking caused by the instability of the hand holding the terminal. The OIS actuator can move the lens module in a direction perpendicular to the optical axis direction to compensate for unintentional shaking.

[0006] However, using an OIS actuator in a camera module tends to increase the size of the camera module. Summary of the invention

[0007] This Summary is provided to introduce selected concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[0008] In one general aspect, a lens driving device includes: a shake compensation unit configured to move in a direction perpendicular to an optical axis; and a plurality of ball members supporting the shake compensation unit, wherein a degree of freedom of one of the plurality of ball members is different from a degree of freedom of another of the ball members.

[0009] A degree of freedom of one of the plurality of ball members may be greater than a degree of freedom of another of the plurality of ball members.

[0010] One or more of the multiple ball components can move along a first axis direction perpendicular to the optical axis and a second axis direction perpendicular to the first axis direction according to a rolling motion, and one or more of the remaining ball components can move along the first axis direction or the second axis direction but not along these two directions according to a rolling motion.

[0011] The multiple ball components may include: a first ball component, which can move along a first axis direction perpendicular to the optical axis according to a rolling motion; a second ball component, which can move along a second axis direction perpendicular to the first axis direction according to a rolling motion; and a third ball component, which can move along both the first axis direction and the second axis direction according to a rolling motion.

[0012] The shake compensation unit may include a plurality of guide grooves in which the plurality of ball members are accommodated, and one of the plurality of guide grooves may have a shape different from that of another of the plurality of guide grooves.

[0013] The plan view shape of the guide groove that accommodates the ball member having the largest degree of freedom may be circular, and the plan view shape of the guide groove that accommodates the ball member having the smaller degree of freedom may be rectangular.

[0014] The shake compensation unit may include a lens frame attached to the lens barrel, the lens frame being supported by the groups of the plurality of ball members, the groups of the plurality of ball members being disposed on different planes from each other.

[0015] The lens holder may include a magnet, and the magnet may be disposed between the groups of the plurality of ball members disposed on different planes from each other.

[0016] The shake compensation unit may include a magnet, and a yoke portion may be provided separately from the magnet in the optical axis direction.

[0017] A pressure biased toward the yoke part may be applied to the shake compensation unit.

[0018] The general aspect of the lens driving apparatus may further include a focus unit configured to be movable in the optical axis direction, and the shake compensation unit may be configured to be movable in the optical axis direction together with the focus unit.

[0019] Multiple magnets may be mounted on different surfaces of the focus unit.

[0020] The magnet mounted on one surface of the focus unit may face the coil, and the magnet mounted on the other surface of the focus unit may face the position sensor.

[0021] A plurality of coils may be disposed to face the plurality of magnets, and a position sensor may be disposed at a position adjacent to one of the plurality of coils.

[0022] In another general aspect, a camera module includes: a frame and a lens holder, which are arranged in a bracket along an optical axis direction; a first ball member, supporting the frame so as to be movable along a first axis direction perpendicular to the optical axis direction; a second ball member, supporting the lens holder so as to be movable along a second axis direction perpendicular to the first axis direction; and a third ball member, supporting the lens holder so as to be movable along the first axis direction and the second axis direction.

[0023] The first ball member may be disposed between the bracket and the frame.

[0024] The second ball member may be disposed between the frame and the lens holder.

[0025] The third ball member may be disposed between the bracket and the lens holder.

[0026] The first ball member may be movable along the first axis direction according to a rolling motion. The second ball member may be movable along the second axis direction according to a rolling motion. The third ball member may be movable along the first axis direction and the second axis direction according to a rolling motion.

[0027] The lens holder may be provided with a magnet, and the bracket may be provided with a yoke part which generates an attractive force with the magnet in the optical axis direction.

[0028] An opening may be provided in a portion of the frame corresponding to a region where the magnet and the yoke portion face each other in the optical axis direction.

[0029] The magnet and the yoke portion may be disposed in a region where the lens holder and the frame do not overlap each other in the optical axis direction.

[0030] The general aspect of the camera module may further include a housing in which the bracket is accommodated, and the bracket may be configured to be movable within the housing in a direction of the optical axis.

[0031] In another general aspect, a camera module includes: a lens barrel; a guide member disposed around the lens barrel to guide the lens barrel along an optical axis direction; a first ball member movable along a first axis direction perpendicular to the optical axis direction; a second ball member movable along a second axis direction perpendicular to both the first axis direction and the optical axis direction, but not movable along the first axis direction; a third ball member movable along both the first axis direction and the second axis direction, the first ball member and the second ball member being combined with the guide member to move the lens barrel along the first axis direction and the second axis direction.

[0032] The guide member may include a frame including a first groove combined with the first ball member and a second groove combined with the second ball member, and the third ball member is not combined with the frame.

[0033] The guide member may further include a lens holder configured to move together with the lens barrel, and the frame may be movably coupled to the lens barrel through the lens holder and at least one of the first ball member and the second ball member.

[0034] Other features and aspects will become apparent from the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a perspective view of an example of a camera module.

[0036] Figure 2 is based on Figure 1 Schematic exploded perspective view of an example of a camera module.

[0037] Figure 3 It is along Figure 1 A cross-sectional view of an example of a camera module taken along line AA'.

[0038] Figure 4 yes Figure 3 Part B is a schematic enlarged view of an example of a camera module.

[0039] Figure 5 is a partially exploded perspective view of an example of a camera module according to the present disclosure.

[0040] Figure 6 is a schematic perspective view showing another example of a camera module.

[0041] Figure 7 and Figure 8 is based on Figure 2 An exploded perspective view of an example of a shake compensation unit of a camera module is shown in FIG.

[0042] Fig. 9 It is a conceptual diagram showing the degrees of freedom of an object.

[0043] Fig.10 is based on Figure 2 An assembly perspective view of an example of a shake compensation unit of a camera module is shown in FIG.

[0044] Fig.11A It is along Fig.10 An example cutaway perspective view of a camera module taken along line CC'.

[0045] Fig. 11B is a perspective view showing an operation mechanism of an example in which the shake compensation unit uses a driving force generated in the X-axis direction.

[0046] Fig. 12A It is along Fig.10 A cutaway perspective view of an example of a jitter compensation unit taken along line DD'.

[0047] Fig. 12B: is a perspective view showing an operation mechanism of an example in which the shake compensation unit uses a driving force generated in the Y-axis direction.

[0048] Fig.13 is a plan view showing an example of a shake compensation unit in which a first ball member and a third ball member are provided on a carrier.

[0049] Fig.14 is a plan view showing an example of a shake compensation unit in which a second ball member is provided on a frame and a third ball member is provided on a bracket.

[0050] Fig.15A is a perspective view illustrating movement of a first ball member according to an example of a camera module.

[0051] Fig. 15B is a perspective view illustrating movement of a second ball member according to an example of a camera module.

[0052] Fig. 15C is a perspective view illustrating movement of a third ball member according to an example of a camera module.

[0053] Throughout the drawings and detailed description, unless otherwise described or provided, the same drawing reference numerals will be understood to refer to the same elements, features and structures. The drawings may not be drawn to scale, and the relative sizes, proportions and depictions of the elements in the drawings may be exaggerated for clarity, illustration and convenience. DETAILED DESCRIPTION

[0054] The following specific embodiments are provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the systems, devices and / or methods described herein will be apparent to those of ordinary skill in the art. The described processing steps and / or operational processes are examples, however, except for the steps and / or operations that must be performed in a particular order, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as is known in the art. In addition, for greater clarity and brevity, descriptions of functions and structures known to those of ordinary skill in the art may be omitted.

[0055] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided so that this disclosure will be thorough and complete and will convey the full scope of the disclosure to those skilled in the art.

[0056] Throughout the specification, it will be understood that when an element such as a layer, region, or wafer (substrate) is referred to as being "on", "connected to," or "bonded to" another element, the element may be directly "on," "connected to," or "bonded to" another element, or there may be other elements between them. In contrast, when an element is referred to as being "directly on," "directly connected to," or "directly bonded to" another element, there may be no elements or layers between them. The same reference numerals always represent the same element. As used herein, the term "and / or" includes any and all combinations of one or more associated listed items.

[0057] It will be apparent that, although the terms "first," "second," "third," etc., may be used herein to describe various members, components, regions, layers, and / or portions, these members, components, regions, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, the first member, component, region, layer, or portion discussed below may be referred to as a second member, component, region, layer, or portion without departing from the teachings of this exemplary embodiment.

[0058] For ease of description, spatially related terms (e.g., "above," "above," "below," and "below," etc.) may be used herein to describe the relationship of one element to another element as shown in the figure. It will be understood that, in addition to the orientation shown in the drawings, spatially related terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as "above" or "above" other elements or features may be oriented as "below" or "below" other elements or features. Therefore, based on the specific orientation of the drawing, the term "above" may include both "above" and "below" orientations. The device may be positioned otherwise (rotated 90 degrees or in other orientations), and the spatial relationship descriptors used herein may be interpreted accordingly.

[0059] The terms used herein are only for describing the illustrated embodiments and are not intended to limit this specification. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. It will also be understood that when the terms "comprise" and / or "comprising" are used in this specification, it indicates the presence of the above-mentioned features, integers, steps, operations, components, elements and / or combinations thereof, without excluding the presence or addition of one or more other features, integers, steps, operations, components, elements and / or combinations thereof.

[0060] In the following, various embodiments will be described with reference to the schematic diagrams. In the accompanying drawings, for example, due to manufacturing techniques and / or tolerances, modifications of the shapes shown may be expected. Therefore, the embodiments of this specification should not be interpreted as being limited to the specific shapes of the regions shown here, for example, and are not limited to including changes in shape caused by manufacturing. The following embodiments may also be composed of one or a combination thereof.

[0061] The contents of the embodiments described below may have various configurations, and only required configurations are proposed here, but are not limited thereto.

[0062] The following description relates to a lens driving apparatus and a camera module including the lens driving apparatus, which can be applied to portable electronic devices such as mobile communication terminals, smart phones, tablet PCs, etc.

[0063] A camera module is an optical device for capturing still or dynamic images. The camera module may include a lens that refracts light reflected from an object and a lens driving device that moves the lens to adjust the focus or compensate for the shaking of the camera module when capturing an image.

[0064] Figure 1 is a perspective view of an example of a camera module, Figure 2 is a schematic exploded perspective view of a camera module.

[0065] Reference Figure 1 and Figure 2 , the camera module 1000 includes a lens barrel 200, a lens driving device 500, an image sensor unit 600, a housing 120, and a casing 110. The housing 120 and the casing 110 accommodate the lens barrel 200 and the lens driving device 500 therein. The lens driving device 500 moves the lens barrel 200 within the housing 120 and the casing 110. The image sensor unit 600 converts light incident through the lens barrel 200 into an electrical signal.

[0066] In this example, the lens barrel 200 has a hollow cylindrical shape so that a plurality of lenses for capturing an image of a subject can be accommodated therein, and the plurality of lenses are disposed in the lens barrel 200 along an optical axis.

[0067] The number of lenses in lens barrel 200 may vary according to the design of lens barrel 200 , and the individual lenses may have optical characteristics such as the same refractive index or different refractive indexes.

[0068] The lens driving device 500 may be a device that moves the lens barrel 200 .

[0069] For example, the lens driving device 500 can adjust the focal length by moving the lens barrel 200 in the optical axis direction (Z axis direction), and compensate for the shaking of the camera module 1000 by moving the lens barrel 200 in a direction perpendicular to the optical axis (Z axis) when capturing an image.

[0070] The lens driving device 500 includes a focus adjustment unit 300 for adjusting the focal length and a shake compensation unit 400 for compensating for camera shake.

[0071] The image sensor unit 600 may be a device that converts light incident through the lens barrel 200 into an electrical signal.

[0072] In this example, the image sensor unit 600 includes an image sensor 610 and a printed circuit board 620 connected to the image sensor 610 , and may further include an IR filter.

[0073] The IR filter may be used to block light in an infrared region among light incident through the lens barrel 200 .

[0074] The image sensor 610 may convert light incident through the lens barrel 200 into an electric signal. For example, the image sensor 610 may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).

[0075] The electrical signal converted by the image sensor 610 may be output as an image through a display unit of the portable electronic device.

[0076] The image sensor 610 may be attached to the printed circuit board 620 and electrically connected to the printed circuit board 620 through wire bonding.

[0077] The lens barrel 200 and the lens driving device 500 are accommodated in the housing 120 .

[0078] In this example, the upper and lower portions of the housing 120 include openings, and the lens barrel 200 and the lens driving device 500 are accommodated in an inner space of the housing 120 .

[0079] The image sensor unit 600 is disposed under the housing 120 .

[0080] The housing 110 may be coupled to the case 120 to surround an outer surface of the case 120 and serve to protect internal components of the camera module.

[0081] Furthermore, the housing 110 may be used to block electromagnetic waves.

[0082] For example, the housing 110 may block electromagnetic waves so that electromagnetic waves generated in the camera module do not affect other electronic components in the portable electronic device.

[0083] In addition, since various electronic components other than the camera module are installed in the portable electronic device, the housing 110 may block electromagnetic waves so that electromagnetic waves generated in these electronic components do not affect the entire camera module 1000 .

[0084] The housing 110 may be formed of metal to be grounded through a ground pad provided in the printed circuit board 620 , and thus the housing 110 may block electromagnetic waves.

[0085] Figure 3 It is along Figure 1 A cross-sectional view taken along the A-A' line, Figure 4 yes Figure 3 Schematic enlargement of part B.

[0086] also, Figure 5 is based on Figure 2 0014-07-2011 1 1 is a partially exploded perspective view of an example camera module shown in FIG.

[0087] Will refer to Figures 3 to 5 The focus adjustment unit 300 of the lens driving apparatus 500 is described.

[0088] The lens barrel 200 may move inside the lens driving device 500 to adjust the camera lens to focus on a subject.

[0089] For example, refer to Figures 3 to 5 , the focus unit 300 may move the lens barrel 200 in the optical axis direction (Z-axis direction) to adjust the lens to focus on the subject.

[0090] In this example, the focus unit 300 includes a bracket 310 that accommodates the lens barrel 200 therein, and a focus driving part that generates a driving force to move the lens barrel 200 and the bracket 310 along the optical axis direction (Z-axis direction).

[0091] The focus driving part includes a magnet 320a and a coil 330a.

[0092] Reference Figure 4 , the magnet 320 a is installed on one side surface of the bracket 310 .

[0093] In this example, the coil 330a is attached to the housing 120 via the plate 130. Figure 3 The coil 330 a is mounted on the board 130 located on a surface of the housing 120 opposite to the coil 452 of the shake compensation unit 400 .

[0094] The magnet 320a may be a movable structure mounted on the bracket 310 and moving along the optical axis direction (Z-axis direction) with the bracket 310, and the coil 330a may be a fixed structure attached to the housing 120. However, the positions of the magnet 320a and the coil 330a are not limited thereto, but may be interchangeable with each other.

[0095] When power is applied to the coil 330 a , the bracket 310 may move in the optical axis direction (Z-axis direction) by electromagnetic interaction between the magnet 320 a and the coil 330 a .

[0096] Since the lens barrel 200 is accommodated inside the bracket 310 , the lens barrel 200 can also move in the optical axis direction (Z-axis direction) by moving the bracket 310 .

[0097] When the bracket 310 moves along the optical axis direction (Z-axis direction), the rolling member 370 disposed between the bracket 310 and the housing 120 is used to reduce the friction between the bracket 310 and the housing 120. In this example, the rolling member 370 is spherical.

[0098] The rolling members 370 may be disposed on both sides of the magnet 320a, such as Figure 5 shown.

[0099] The first yoke 350 may be disposed in the housing 120. Figure 4 , the first yoke 350 is disposed on the inner side surface of the housing 120 to face the magnet 320a with the coil 330a interposed therebetween.

[0100] An attractive force in a direction perpendicular to the optical axis (Z axis) may act between the first yoke 350 and the magnet 320 a .

[0101] Therefore, due to the attraction between the first yoke 350 and the magnet 320 a , the rolling member 370 may maintain a state of contact with the bracket 310 and the housing 120 .

[0102] In addition, the first yoke 350 may serve to concentrate the magnetic force of the magnet 320a, thereby preventing the occurrence of magnetic flux leakage.

[0103] The first yoke 350 and the magnet 320 a may form a magnetic circuit.

[0104] According to one example, the length of the first yoke 350 in the optical axis direction (Z-axis direction) may be longer than the length of the magnet 320 a in the optical axis direction (Z-axis direction).

[0105] When the length of the first yoke 350 in the optical axis direction (Z-axis direction) is set to be shorter than the length of the magnet 320a in the optical axis direction (Z-axis direction), when the magnet 320a moves along the optical axis direction (Z-axis direction), the attraction acting on the center of the magnet 320a to guide the magnet 320a toward the center of the first yoke 350 will increase.

[0106] Therefore, the restoring force of the magnet 320a for returning the magnet 320a to the initial position may further increase, so that the amount of current required to move the magnet 320a may increase, and thus power consumption may increase.

[0107] However, in an example where the length of the first yoke 350 in the optical axis direction (Z-axis direction) is longer than the length of the magnet 320a in the optical axis direction (Z-axis direction), the power consumption can be relatively reduced because the attraction acting on the center of the magnet 320a to guide the magnet 320a toward the center of the first yoke 350 is relatively reduced.

[0108] Meanwhile, the second yoke 340 is disposed between the bracket 310 and the magnet 320 a .

[0109] The second yoke 340 may serve to concentrate the magnetic force of the magnet 320 a , thereby preventing magnetic flux leakage from occurring.

[0110] The second yoke 340 and the magnet 320 a may form a magnetic circuit.

[0111] In this example, a closed-loop control method that senses the position of the lens barrel 200 is used to provide feedback regarding the position of the lens barrel 200 .

[0112] Therefore, closed loop control may require a position sensor 360. The position sensor 360 may be a Hall sensor.

[0113] The position sensor 360 may be disposed inside or outside the coil 330 a and may be mounted on the board 130 on which the coil 330 a is mounted.

[0114] In addition, the position sensor 360 may be integrally formed with a circuit element (eg, a driver IC) that provides a driving signal to the focus unit 300 (see FIG. 2 ). Figure 5 ). However, the position sensor 360 is not limited thereto, and the position sensor 360 and the circuit element may be respectively provided as separate components.

[0115] When the camera module is activated, the position sensor 360 may sense the initial position of the lens barrel 200. In addition, the lens barrel 200 may move from the sensed initial position to the initial setting position. The initial position may be the position of the lens barrel 200 in the optical axis direction when the camera module is activated, and the initial setting position may be the position of the lens barrel 200 where the focal length of the lens barrel 200 becomes infinite.

[0116] The lens barrel 200 may be moved from an initially set position to a target position by a driving signal of a circuit element.

[0117] During the focusing process, the lens barrel 200 can move forward and backward along the optical axis direction (Z axis direction). In other words, the lens barrel 200 can move bidirectionally along the optical axis direction (Z axis direction).

[0118] In order to ensure sufficient driving force when adjusting the focus, a magnet 320b and a coil 330b may be additionally used.

[0119] In the case of reducing the mounting area for the magnet to manufacture a slim camera module, there is a possibility that the size of the magnet will also be reduced, making it difficult to ensure sufficient driving force.

[0120] However, according to the example provided above, the magnets 320a and 320b may be respectively attached to different surfaces of the bracket 310, and the coils 330a and 330b may be respectively disposed on different surfaces of the housing 120 to face the magnets 320a and 320b, respectively, so that even when the camera module is reduced in size to manufacture a slim electronic product, sufficient driving force required for focusing can be ensured.

[0121] Figure 6 is a schematic perspective view showing another example of the focus adjustment unit of the lens driving device.

[0122] Reference Figure 6 , any one of the plurality of magnets 320 a and 320 b mounted on different surfaces of the bracket 310 may face the coil 330 a , and another one of the plurality of magnets 320 a and 320 b may face the position sensor 360 .

[0123] exist Figure 6 In the example shown in , the magnet 320a faces the coil 330a, and the magnet 320b faces the position sensor 360. Therefore, the magnet 320a can be used as a driving magnet, and the magnet 320b can be used as a sensing magnet.

[0124] In addition, since the coil 330a and the position sensor 360 are disposed separately from each other on different surfaces of the housing 120, a larger space can be secured to install the coil 330a. Therefore, the number of turns of the coil 330a can be increased, and thus, the driving force can be improved.

[0125] In addition, since the coil 330a and the position sensor 360 are disposed separately from each other on different surfaces of the housing 120, the influence of the electric field of the coil 330a on the position sensor 360 can be significantly reduced. Therefore, the sensing accuracy of the position sensor 360 can be improved.

[0126] Figure 7 and Figure 8 Shown according to Figure 2 An exploded perspective view of an example of a jitter compensation unit.

[0127] The shake compensation unit 400 is used to correct image blur or image distortion caused by factors such as hand shake of a user when capturing a still image or a moving image.

[0128] For example, when capturing an image, in the case where the camera shakes due to an unsteady hand of a user, etc., the shake compensation unit 400 may transmit a relative displacement corresponding to the hand shake to the lens barrel 200 to correct blur.

[0129] In order to compensate for the shake of the camera module, the shake compensation unit 400 may move the lens barrel 200 in a direction perpendicular to the optical axis (Z axis).

[0130] Reference Figure 7 and Figure 8 The shake compensation unit 400 includes: a guide member to guide the movement of the lens barrel 200; and a shake compensation driving part to generate a driving force to move the guide member in a direction perpendicular to the optical axis (Z axis).

[0131] In this example, the guide member includes a frame 410 and a lens holder 420. The frame 410 and the lens holder 420 are inserted into the bracket 310 so as to be disposed in the optical axis direction (Z-axis direction), and serve to guide the movement of the lens barrel 200.

[0132] The frame 410 and the lens holder 420 each include a space or opening (see Figure 2 ), the lens barrel 200 may be inserted into the space or opening. The lens barrel 200 may be attached to the lens holder 420 so that the lens barrel 200 and the lens holder 420 move together.

[0133] The frame 410 and the lens frame 420 may move in a direction perpendicular to the optical axis (Z axis) inside the bracket 310 by a driving force generated in the shake compensation driving part.

[0134] The shake compensation driving unit includes a first shake compensation driving unit 440 and a second shake compensation driving unit 450 . The first shake compensation driving unit 440 includes a magnet 441 and a coil 442 , and the second shake compensation driving unit 450 includes a magnet 451 and a coil 452 .

[0135] The first jitter compensation driving unit 440 may generate a driving force in a first axis direction (X axis direction) perpendicular to the optical axis (Z axis), and the second jitter compensation driving unit 450 may generate a driving force in a second axis direction (Y axis direction) perpendicular to the first axis (X axis).

[0136] In this example, the second axis (Y axis) is an axis perpendicular to both the optical axis (Z axis) and the first axis (X axis).

[0137] The first and second jitter compensation drive units 440 and 450 are disposed to be orthogonal to each other on a plane perpendicular to the optical axis (Z axis). For example, the magnet 441 of the first and second jitter compensation drive units 440 and 451 of the second jitter compensation drive units 450 are disposed to be orthogonal to each other on a plane perpendicular to the optical axis (Z axis).

[0138] The magnet 441 of the first shake compensation driving unit 440 and the magnet 451 of the second shake compensation driving unit 450 are mounted on the lens frame 420, and the coils 442 and 452 facing the magnets 441 and 451, respectively, are mounted on the housing 120. For convenience of explanation, Figure 7 and Figure 8 An example is shown in which the coils 442 and 452 are disposed toward the support 310. However, as Figure 2 As shown, coils 442 and 452 may be attached to housing 120 via plate 130 .

[0139] The magnets 441 and 451 may be movable structures that move in a direction perpendicular to the optical axis (Z axis) together with the lens holder 420, and the coils 442 and 452 may be fixed structures attached to the housing 120. However, the arrangement of the magnets 441 and 451 and the coils 442 and 452 is not limited thereto, and their positions may be interchangeable.

[0140] Meanwhile, a plurality of ball members are provided to support the shake compensation unit 400. The plurality of ball members may be used to guide the frame 410 and the lens holder 420 to compensate for the shake of the camera. In addition, the plurality of ball members may be used to maintain the intervals between the bracket 310, the frame 410 and the lens holder 420.

[0141] The plurality of ball members include a first ball member 700 and a second ball member 800 .

[0142] The first ball member 700 guides the movement of the shake compensation unit 400 in a first axis direction (X axis direction), and the second ball member 800 guides the movement of the shake compensation unit 400 in a second axis direction (Y axis direction).

[0143] For example, in response to the driving force being generated in the first axis direction (X axis direction), the first ball member 700 may move in the first axis direction (X axis direction) in a rolling motion. Therefore, the first ball member 700 may guide the movement of the frame 410 and the lens holder 420 in the first axis direction (X axis direction).

[0144] In addition, in response to the driving force being generated in the second axis direction (Y axis direction), the second ball member 800 can move in the second axis direction (Y axis direction) according to the rolling motion. Therefore, the second ball member 800 can guide the movement of the lens frame 420 in the second axis direction (Y axis direction).

[0145] The first ball member 700 includes a plurality of ball members disposed between the bracket 310 and the frame 410 , and the second ball member 800 includes a plurality of ball members disposed between the frame 410 and the lens holder 420 .

[0146] Reference Figure 7 First guide grooves 710a, 710b, 710c, 720a, 720b and 720c, in which the first ball member 700 is accommodated, are respectively formed in surfaces of the bracket 310 and the frame 410 facing each other in the optical axis direction (Z-axis direction). The first guide grooves 710a, 710b, 710c, 720a, 720b and 720c include a plurality of guide grooves.

[0147] The first ball member 700 is received in the first guide grooves 710 a , 710 b , 710 c , 720 a , 720 b , and 720 c so as to be inserted between the bracket 310 and the frame 410 .

[0148] Since the first ball member 700 is accommodated in the first guide grooves 710a, 710b, 710c, 720a, 720b and 720c, the movement of the first ball member 700 is restricted in the optical axis direction (Z axis direction) and the second axis direction (Y axis direction). Therefore, the first ball member 700 is movable only in the first axis direction (X axis direction). For example, the first ball member 700 can move only in the first axis direction (X axis direction) according to the rolling motion.

[0149] To this end, a plan view shape of each of the plurality of first guide grooves 710a, 710b, 710c, 720a, 720b, and 720c may be a rectangle having a length in a first axis direction (X axis direction) longer than a width in a second axis direction (Y axis direction).

[0150] In addition, the cross-sectional shapes of some of the plurality of first guide grooves 710a, 710b, 710c, 720a, 720b, and 720c may be different from the cross-sectional shapes of the other guide grooves.

[0151] For example, among the plurality of first guide grooves 710a, 710b, 710c, 720a, 720b and 720c, some guide grooves 710b and 720b may have a substantially ∪-shaped cross-sectional shape, while other guide grooves 710a, 710c, 720a and 720c may have a substantially ∨-shaped cross-sectional shape.

[0152] In this example, among the plurality of first guide grooves 710a, 710b, 710c, 720a, 720b, and 720c, the guide grooves 710b and 720b having a substantially “∪”-shaped cross section are the guide grooves disposed farthest from the third guide grooves 910 and 920 (see FIG. Figure 7 , Figure 8 and Fig.13 ).

[0153] Reference Figure 8 Second guide grooves 810a, 810b, 810c, 820a, 820b, and 820c, in which the second ball member 800 is accommodated, are respectively formed in surfaces of the frame 410 and the lens holder 420 facing each other in the optical axis direction (Z-axis direction). The second guide grooves 810a, 810b, 810c, 820a, 820b, and 820c include a plurality of guide grooves.

[0154] The second ball member 800 is received in the second guide grooves 810 a , 810 b , 810 c , 820 a , 820 b , and 820 c so as to be inserted between the frame 410 and the lens holder 420 .

[0155] Since the second ball member 800 is accommodated in the second guide grooves 810a, 810b, 810c, 820a, 820b and 820c, the movement of the second ball member 800 is limited in the optical axis direction (Z axis direction) and the first axis direction (X axis direction). Therefore, the second ball member 800 is movable only in the second axis direction (Y axis direction). For example, the second ball member 800 can move only in the second axis direction (Y axis direction) according to the rolling motion.

[0156] To this end, the plan view shape of each of the plurality of second guide grooves 810a, 810b, 810c, 820a, 820b and 820c may be a rectangle having a length in the second axis direction (Y axis direction) longer than a width in the first axis direction (X axis direction).

[0157] In addition, the cross-sectional shapes of some of the plurality of second guide grooves 810a, 810b, 810c, 820a, 820b, and 820c may be different from the cross-sectional shapes of the other guide grooves.

[0158] For example, among the second guide grooves 810a, 810b, 810c, 820a, 820b and 820c, the cross-sectional shape of some guide grooves 810b and 820b may be substantially "∪"-shaped, while the cross-sectional shape of other guide grooves 810a, 810c, 820a and 820c may be substantially "∨"-shaped.

[0159] In this example, among the plurality of second guide grooves 810a, 810b, 810c, 820a, 820b, and 820c, the guide grooves 810b and 820b having a substantially “∪”-shaped cross section are the guide grooves disposed farthest from the third guide grooves 910 and 920 (see FIG. Figure 7 , Figure 8 and Fig.14 ).

[0160] Meanwhile, a third ball member 900 supporting the movement of the lens frame 420 is provided between the bracket 310 and the lens frame 420 .

[0161] The third ball member 900 may guide the movement of the lens holder 420 in both the first axis direction (X axis direction) and the second axis direction (Y axis direction).

[0162] For example, in response to the driving force being generated in the first axis direction (X axis direction), the third ball member 900 may move along the first axis direction (X axis direction) in a rolling motion. Therefore, the third ball member 900 may guide the movement of the lens holder 420 in the first axis direction (X axis direction).

[0163] In addition, in response to the driving force being generated in the second axis direction (Y axis direction), the third ball member 900 may move along the second axis direction (Y axis direction) in a rolling motion. Therefore, the third ball member 900 may guide the movement of the lens holder 420 in the second axis direction (Y axis direction).

[0164] Meanwhile, the second ball member 800 and the third ball member 900 may support the lens holder 420 while being in contact with the lens holder 420. In this example, the second ball member 800 and the third ball member 900 are located on different planes from each other (see FIG. Figure 8 as well as FIG. 11A to FIG. 12B ).

[0165] Reference Figure 8 The magnet 441 of the first shake compensation driving part 440 and the magnet 451 of the second shake compensation driving part 450 are disposed on the lens frame 420 , and the second ball member 800 and the third ball member 900 are located on both sides of each of the magnets 441 and 451 , respectively.

[0166] That is, the magnet 441 of the first shake compensation driving portion 440 and the magnet 451 of the second shake compensation driving portion 450 are located between ball members disposed on different planes from each other.

[0167] Third guide grooves 910 and 920 in which the third ball member 900 is received are respectively formed in surfaces of the holder 310 and the lens holder 420 that face each other in the optical axis direction (Z-axis direction).

[0168] The third ball member 900 is received in the third guide grooves 910 and 920 so as to be inserted between the bracket 310 and the lens holder 420 .

[0169] Since the third ball member 900 is accommodated in the third guide grooves 910 and 920, the movement of the third ball member 900 is restricted in the optical axis direction (Z-axis direction), but the third ball member 900 can move along both the first axis direction (X-axis direction) and the second axis direction (Y-axis direction) according to rolling motion.

[0170] To this end, the plan view shape of the third guide grooves 910 and 920 may be circular. Therefore, the plan view shape of the third guide grooves 910 and 920, the plan view shape of the first guide grooves 710a, 710b, 710c, 720a, 720b and 720c, and the plan view shape of the second guide grooves 810a, 810b, 810c, 820a, 820b and 820c are different from each other.

[0171] As a result, the first ball member 700 is movable along the first axis direction (X axis direction) according to the rolling motion, the second ball member 800 is movable along the second axis direction (Y axis direction) according to the rolling motion, and the third ball member 900 is movable along both the first axis direction (X axis direction) and the second axis direction (Y axis direction) according to the rolling motion.

[0172] Therefore, the degree of freedom allowed to some of the plurality of ball members supporting the shake compensation unit 400 is different from the degree of freedom allowed to the remaining ball members.

[0173] Reference Fig. 9 , the degrees of freedom of an object can correspond to the number of independent variables required to represent the motion state of the object in a three-dimensional coordinate system.

[0174] Usually, the degree of freedom of an object in a three-dimensional coordinate system is 6. The motion of an object can be represented by an orthogonal coordinate system in three directions and a rotational coordinate system in three directions.

[0175] For example, the object may move along each of the axis directions (X, Y, and Z) in a translational motion, and may move about each of the axes (X, Y, and Z) in a rotational motion.

[0176] In the present specification, the degrees of freedom may refer to the number of independent variables required to represent the movement of the first ball member 700, the second ball member 800, and the third ball member 900 when the shake compensation unit 400 moves due to a driving force generated by applying power to the shake compensation unit 400 in a direction perpendicular to the optical axis (Z axis).

[0177] For example, the third ball member 900 may move in two axis directions (a first axis direction (X axis direction) and a second axis direction (Y axis direction)) according to a rolling motion (see FIG. Fig. 15C ), and the first ball member 700 and the second ball member 800 can move along one axis direction (which can be the first axis direction (X axis direction) or the second axis direction (Y axis direction)) in accordance with a rolling motion in response to a driving force generated in a direction perpendicular to the optical axis (Z axis) (see Fig.15A and Fig. 15B ).

[0178] Therefore, in this example, the degree of freedom of the third ball member 900 is greater than the degree of freedom of the first ball member 700 and the second ball member 800 .

[0179] Will refer to Figures 10 to 12B The movements of the first ball member 700, the second ball member 800, and the third ball member 900 in response to the driving force generated in the direction perpendicular to the optical axis (Z axis) are described.

[0180] like Fig. 11B As shown, in response to the driving force Fx being generated in the first axis direction (X axis direction), the frame 410 and the lens holder 420 may move together in the first axis direction (X axis direction).

[0181] The first ball member 700 and the third ball member 900 can move in the first axis direction (X axis direction) according to the rolling motion to move the lens holder 420 in the first axis direction (X axis direction). In this example, the movement of the second ball member 800 is restricted in the first axis direction (X axis direction).

[0182] In addition, if Fig. 12B As shown, in response to the driving force Fy being generated in the second axis direction (Y axis direction), the lens holder 420 may move along the second axis direction (Y axis direction).

[0183] The second ball member 800 and the third ball member 900 are movable in the second axis direction (Y axis direction) in rolling motion. In this example, the movement of the first ball member 700 is restricted in the second axis direction (Y axis direction).

[0184] When performing compensation for camera instability, the frame 410 and the lens holder 420 may be prevented from rotating based on the optical axis (Z axis) by limiting the movement of some ball members as described above.

[0185] Since the unintentional shaking of the camera module occurs rapidly at a speed of several tens of Hz per second, the shake compensation unit 400 may move continuously along the first axis direction (X axis direction) and the second axis direction (Y axis direction). Therefore, since it is difficult to continuously apply the driving force generated in the first axis direction (X axis direction) and the second axis direction (Y axis direction) to the center of the shake compensation unit 400, there is a risk that the shake compensation unit 400 will rotate based on the optical axis (Z axis) during compensation to remove the influence of the shaking of the camera module.

[0186] For example, when all ball members are constructed to be movable in rolling motion in both a first axis direction (X-axis direction) and a second axis direction (Y-axis direction), there is a risk that the shake compensation unit 400 will rotate around the optical axis (Z-axis), which will deteriorate image quality.

[0187] However, according to Figure 7 and Fig. 9 In the example shown in FIG. 4 , during compensation of camera shake, movement of some of the ball members is restricted so that the shake compensation unit 400 can be prevented from rotating around the optical axis (Z axis) by a mechanical structure.

[0188] At the same time, when the ball member that moves along the first axis direction (X-axis direction) according to the rolling motion is called the first ball member, and the ball member that moves along the second axis direction (Y-axis direction) according to the rolling motion is called the second ball member, when the jitter compensation unit 400 moves along the first axis direction (X-axis direction), the ball member (the above-mentioned third ball member 900) arranged between the bracket 310 and the lens frame 420 can be used as the first ball member, and when the jitter compensation unit 400 moves along the second axis direction (Y-axis direction), the ball member (the above-mentioned third ball member 900) arranged between the bracket 310 and the lens frame 420 can be used as the second ball member.

[0189] Therefore, in this example, the first ball member and the second ball member can share the third ball member with each other.

[0190] In the lens driving apparatus 500 , a closed-loop control method of sensing the position of the lens barrel 200 to provide feedback may be used to compensate for camera shake.

[0191] Therefore, position sensors 443 and 453 may be provided for closed-loop control. Figure 8 and Fig.10In the example shown in , the position sensor 443 is provided inside the coil 442 of the first shake compensation driving unit 440 , and the position sensor 453 is provided inside the coil 452 of the second shake compensation driving unit 450 .

[0192] The position sensors 443 and 453 may be hall sensors. The position sensors 443 and 453 may sense the position of the lens barrel 200 through the magnet 441 of the first shake compensation driving part 440 and the magnet 451 of the second shake compensation driving part 450 .

[0193] Meanwhile, the yoke part 380 maintains a contact state between the shake compensation unit 400 and the plurality of ball members.

[0194] The yoke portion 380 is attached to the bracket 310 to face the magnet 441 of the first shake compensation driving portion 440 and the magnet 451 of the second shake compensation driving portion 450 in the optical axis direction (Z-axis direction).

[0195] Therefore, an attractive force in the optical axis direction (Z-axis direction) may be generated between the yoke portion 380 and the magnets 441 and 451 .

[0196] Since the shake compensation unit 400 is pressed in a direction toward the yoke part 380 by the attractive force between the yoke part 380 and the magnets 441 and 451 , the frame 410 and the lens frame 420 of the shake compensation unit 400 maintain a state of contact with the plurality of ball members.

[0197] For example, the lens holder 420 is pressed toward the frame 410 by an attractive force between the yoke part 380 and the magnets 441 and 451 , and thus the frame 410 is pressed toward the bracket 310 .

[0198] In this example, the yoke part 380 includes a first yoke part 380a and a second yoke part 380b. The yoke part 380 may be formed of a material capable of generating an attractive force between the yoke part 380 and the magnets 441 and 451. For example, the yoke part 380 may be formed of a magnetic material.

[0199] The first yoke portion 380a faces the magnet 441 of the first shake compensation driving unit 440 in the optical axis direction (Z axis direction), and the second yoke portion 380b faces the magnet 451 of the second shake compensation driving unit 450 in the optical axis direction (Z axis direction).

[0200] The length of the first yoke portion 380a and the second yoke portion 380b in the direction perpendicular to the optical axis (Z axis) may be equal to or less than the length of the magnets 441 and 451 in the direction perpendicular to the optical axis (Z axis). In this case, in response to the movement of the magnets 441 and 451 in the direction perpendicular to the optical axis (Z axis), the restoring force for returning to the initial position may be further increased by the attraction between the magnets 441 and 451 and the yoke portion 380.

[0201] To compensate for the shaking of the camera module 1000, it is necessary to immediately correspond to the unstable movement of the camera module due to the user's hand movement, etc. That is, the lens barrel 200 may have to continuously move in the first axis direction (X axis direction) and the second axis direction (Y axis direction).

[0202] For example, since the shaking of the camera module occurs rapidly at a speed of several tens of Hz per second, it may be difficult to generate vibration corresponding to the shaking of the camera module using only the electromagnetic force between the magnets 441 and 451 and the coils 442 and 452 .

[0203] Therefore, the lens barrel 200 can move in the first axis direction (X axis direction) and the second axis direction (Y axis direction) by simultaneously using the restoring force acting between the magnets 441 and 451 and the yoke part 380 and the electromagnetic force between the magnets 441 and 451 and the coils 442 and 452.

[0204] Therefore, the position of the lens barrel 200 can be continuously adjusted to correspond to the jitter, which can further reduce power consumption.

[0205] When the camera module is activated, an initial position (a position in a direction perpendicular to the optical axis (Z axis)) of the lens barrel 200 may be sensed by the position sensors 443 and 453. Also, the lens barrel 200 may move from the sensed initial position to a set position.

[0206] The setting position may be the center of the movable range in the first axis direction (X axis direction) and the center of the movable range in the second axis direction (Y axis direction). Mechanically, the setting position may be the center of the bracket 310 accommodating the shake compensation unit 400 in the first axis direction (X axis direction) and the second axis direction (Y axis direction).

[0207] When the camera module does not shake, the lens barrel 200 needs to be fixed so as not to move along the first optical axis direction (X-axis direction) and the second axis direction (Y-axis direction).

[0208] According to this example, since the yoke portion 380 attracts the magnets 441 and 451 along the optical axis direction (Z-axis direction), when no jitter compensation signal is applied, the lens barrel 200 can be maintained in a state where the lens barrel 200 is fixed at a predetermined position in a direction perpendicular to the optical axis (Z-axis) through the attraction between the yoke portion 380 and the magnets 441 and 451.

[0209] However, since each component of the camera module has manufacturing tolerances, when the lens barrel 200 is fixed only by the attraction between the yoke portion 380 and the magnets 441 and 451, there is a risk that the optical axis (Z axis) of the lens will not be aligned with the center of the image sensor 610, which will deteriorate the image quality.

[0210] Furthermore, it is difficult to maintain the lens barrel 200 in a fixed state only by the attractive force between the yoke part 380 and the magnets 441 and 451 .

[0211] Therefore, when the camera module is activated, the position of the lens barrel 200 (in a direction perpendicular to the optical axis (Z axis)) may be adjusted so that the lens barrel 200 is mechanically located in the middle in a direction perpendicular to the optical axis (Z axis).

[0212] Therefore, when the camera module is started, when the camera module is not shaking, the lens barrel 200 can maintain the state in which the lens barrel 200 is mechanically fixed to the center in a direction perpendicular to the optical axis (Z axis) through the attraction between the yoke portion 380 and the magnets 441 and 451 and the driving force of the first shake compensation driving portion 440 and the second shake compensation driving portion 450.

[0213] Meanwhile, when the camera module is closed, the position of the lens barrel 200 may be fixed by the attraction between the yoke part 380 and the magnets 441 and 451 .

[0214] In this example, the yoke portion 380 is provided so that the frame 410 and the lens holder 420 can maintain a state of contact with the plurality of ball members. Figure 2 As shown, the stopper 210 is provided to prevent the plurality of ball members, the frame 410 and the lens holder 420 from being separated toward the outside of the bracket 310 due to external impact or the like.

[0215] The stopper 210 is coupled to the bracket 310 to at least partially cover the upper surface of the lens holder 420 .

[0216] Meanwhile, when an optical image stabilization function is provided in a camera, since a guide member for guiding the lens barrel is additionally provided in a bracket 310 of the camera module, the size of the lens driving device and the camera module tends to increase compared to a case where the optical image stabilization function is not provided in the camera module.

[0217] For example, generally, the size of the lens driving device 500 and the thickness of the camera module 1000 increase compared to a case where the frame and the lens frame are not provided because the frame and the lens frame are sequentially provided in the bracket along the optical axis direction (Z-axis direction).

[0218] However, according to Figure 2 In the example shown in FIG. 1 , the lens driving device 500 and the camera module 1000 are configured to provide a compensation function for the shake of the camera module without increasing the sizes of the lens driving device 500 and the camera module 1000 .

[0219] The plan view shapes of the frame 410 and the lens holder 420 may be different from each other. The positions of the centers of gravity of the frame 410 and the lens holder 420 may also be different from each other.

[0220] For example, the plan view shape of the frame 410 may be substantially The plan view shape of the lens holder 420 may be substantially as follows: Shape or a rectangular shape with an opening in the middle.

[0221] Therefore, there may be a region where the frame 410 is provided and a region where the frame 410 is not provided in the region in the optical axis direction (Z-axis direction) between the holder 310 and the lens frame 420 .

[0222] For example, when viewed in the optical axis direction (Z-axis direction), there are regions where the frame 410 and the lens holder 420 overlap each other and regions where the frame 410 and the lens holder 420 do not overlap each other.

[0223] The region where the frame 410 and the lens holder 420 overlap each other in the optical axis direction (Z-axis direction) is a region where the frame 410 is located between the bracket 310 and the lens holder 420 .

[0224] The region where the frame 410 and the lens holder 420 do not overlap each other in the optical axis direction (Z axis direction) is a region where the frame 410 is not disposed between the bracket 310 and the lens holder 420. Therefore, the bracket 310 and the lens holder 420 directly face each other in the optical axis direction (Z axis direction) in this region.

[0225] The magnet 441 of the first shake compensation driving portion 440 and the magnet 451 of the second shake compensation driving portion 450 and the yoke portion 380 are disposed in a region where the bracket 310 and the lens frame 420 directly face each other in the optical axis direction (Z-axis direction).

[0226] That is, the frame 410 has an opening in a region where the magnet 441 of the first shake compensation driving portion 440 and the magnet 451 of the second shake compensation driving portion 450 and the yoke portion 380 face each other in the optical axis direction (Z-axis direction).

[0227] Therefore, the frame 410 is not disposed between the magnets 441 and 451 of the first and second jitter compensation driving units 440 and 450 and the yoke portion 380 in the optical axis direction (Z-axis direction), and therefore, the magnets 441 and 451 are disposed close to the yoke portion 380 .

[0228] According to this example, a region between the bracket 310 and the lens frame 420 where the frame 410 is not provided is obtained by making the frame 410 and the lens frame 420 have plan view shapes different from each other, and the magnets 441 and 451 and the yoke part 380 are provided in the region to be closer to the yoke part 380.

[0229] Therefore, the lens driving apparatus 500 and the camera module 1000 may provide a shake compensation function without increasing the size or height of the lens driving apparatus 500 and the camera module 1000 in the optical axis direction (Z-axis direction).

[0230] In this example, the mounting surface of the lens holder 420 on which the magnets 441 and 451 are mounted may protrude further toward the bottom surface of the bracket 310 than other portions of the lens holder 420 .

[0231] Meanwhile, the third ball member 900 is disposed between the bracket 310 and the lens holder 420 to support the lens holder 420 .

[0232] Since the magnet 441 of the first jitter compensation driving unit 440 and the magnet 451 of the second jitter compensation driving unit 450 are respectively installed on one surface and the other surface of the lens frame 420 orthogonally to each other, an attractive force can act between the magnets 441 and 451 and the yoke portion 380, and a pressure biased toward the yoke portion 380 can be applied to the lens frame 420.

[0233] In this case, since the frame 410 is not disposed in a region where an attractive force acts between the magnets 441 and 451 and the yoke part 380 , the lens frame 420 may be tilted due to the attractive force between the magnets 441 and 451 and the yoke part 380 .

[0234] However, according to Figure 2 In the example shown in FIG. 4 , the third ball member 900 is disposed between the bracket 310 and the lens holder 420 to prevent the lens holder 420 from tilting.

[0235] Since the third ball member 900 directly supports the lens frame 420 between the bracket 310 and the lens frame 420 , the third ball member 900 can guide the movement of the lens frame 420 in both the first axis direction (X axis direction) and the second axis direction (Y axis direction).

[0236] As described above, the frame 410 is not provided in the region where the attractive force acts between the magnets 441 and 451 and the yoke portion 380, but the lens frame 420 is supported by the third ball member 900 by providing the third ball member 900 in the region where the frame 410 is not provided. Therefore, the lens driving device 500 and the camera module 1000 provide a shake compensation function without increasing the size (height) of the lens driving device 500 and the camera module 1000 in the optical axis direction (Z-axis direction).

[0237] Since the biased pressure is applied to the lens frame 420, the intensity levels of the pressure applied to the second ball member 800 and the third ball member 900 supporting the lens frame 420 may be different from each other.

[0238] For example, since the pressure applied to the lens holder 420 is greatest in the area where the magnets 441 and 451 and the yoke part 380 face each other, the intensity of the pressure applied to the third ball member 900 may be greater than the intensity of the pressure applied to the second ball member 800 .

[0239] Furthermore, the intensity of the pressure applied to the third ball member 900 may also be greater than the intensity of the pressure applied to the first ball member 700 .

[0240] As described above, the cross-sectional shape of the guide groove disposed farthest from the third guide grooves 910 and 920 accommodating the third ball member 900 to which the greatest pressure is applied may be different from the cross-sectional shape of the guide groove disposed closer to the third guide grooves 910 and 920 .

[0241] At the same time, if Figure 1 As shown, since the lens driving apparatus 500 and the camera module 1000 according to the present example are reduced in size, the lens barrel 200 may partially protrude to the outside of the housing 110 .

[0242] Figure 2 It is shown that even when the lens barrel 200 is located at the lowermost position of the housing 120 in the optical axis direction (Z-axis direction) in the housing 120 , the lens barrel 200 partially protrudes outside the housing 110 .

[0243] As described above, the lens driving apparatus and the camera module including the same can be miniaturized while providing a shake compensation function.

[0244] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art 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 herein are considered to be descriptive only and not for limiting purposes. The description of the features or aspects in each example is considered 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, structures, devices, or circuits are combined in a different manner, and / or the components in the described systems, structures, devices, or circuits are replaced or supplemented by other components or their equivalents, appropriate results may 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 will be understood to be included in the present disclosure.

Claims

1. A lens driving device, comprising: case; a bracket, accommodated in the housing and configured to be movable along the optical axis; a frame and a lens holder accommodated in the bracket and configured to be movable along the optical axis direction together with the bracket; a lens barrel, attached to the lens holder, A first shake compensation driving unit includes a first magnet disposed in the lens frame and a first coil facing the first magnet in a first axis direction perpendicular to the optical axis and generating a driving force in the first axis direction; a second shake compensation driving section including a second magnet disposed in the lens holder and a second coil facing the second magnet in a second axis direction perpendicular to the first axis direction and generating a driving force in the second axis direction; A focusing drive unit, comprising a third magnet disposed in the bracket and a third coil facing the third magnet; a yoke portion, disposed in the bracket to generate an attractive force relative to the first magnet and the second magnet in the direction of the optical axis; a first ball member disposed between the bracket and the frame and movable in a rolling motion along the first axis; as well as a second ball member disposed between the frame and the lens holder and movable in a rolling motion along the second axis direction, Wherein, the frame is arranged between the bracket and the lens holder, The frame is in an "L" shape in plan view, and The frame is provided with an opening, and the opening is provided at a portion of the frame corresponding to a region where the bracket and the lens holder directly face each other in the optical axis direction.

2. The lens driving device according to claim 1, wherein: The first shake compensation driving section further includes a first position sensor facing the first magnet.

3. The lens driving device according to claim 1, wherein: The second shake compensation driving section further includes a second position sensor facing the second magnet.

4. The lens driving device according to claim 1, wherein: The focus driving unit further includes a third position sensor facing the third magnet.

5. The lens driving device according to claim 1, wherein: The first guide grooves are respectively provided in surfaces of the bracket and the frame facing each other in the direction of the optical axis. The second guide groove portions are respectively provided in surfaces of the frame and the lens holder facing each other in the optical axis direction, and The third guide groove portions are respectively provided in surfaces of the holder and the lens holder facing each other in the optical axis direction.

6. The lens driving device according to claim 5, wherein: The first guide groove portion includes a plurality of guide grooves, The cross-sectional shape of some of the plurality of guide grooves is in a “∪” shape, The cross-sectional shape of other guide grooves among the plurality of guide grooves is in a “∨” shape.

7. The lens driving device according to claim 6, wherein: The guide groove having a “∪”-shaped cross section is the guide groove that is arranged farthest from the third guide groove portion among the plurality of guide grooves of the first guide groove portion.

8. The lens driving device according to claim 5, wherein: The second guide groove portion includes a plurality of guide grooves, The cross-sectional shape of some of the plurality of guide grooves is in a “∪” shape, The cross-sectional shape of other guide grooves among the plurality of guide grooves is in a “∨” shape.

9. The lens driving device according to claim 8, wherein: The guide groove having a “∪”-shaped cross section is the guide groove that is arranged farthest from the third guide groove portion among the plurality of guide grooves of the second guide groove portion.

10. The lens driving device according to claim 1, wherein: A stopper is coupled to the bracket to at least partially cover an upper surface of the lens holder. 11 . The lens driving device according to claim 1 , the yoke portion comprises a first yoke portion facing the first magnet in the optical axis direction and a second yoke portion facing the second magnet in the optical axis direction.

12. The lens driving device according to claim 1, wherein: The frame and the lens holder are configured to be movable together along the first axis direction, and The lens holder is configured to be movable in the second axis direction.

13. The lens driving apparatus of claim 1, further comprising a third ball member disposed between the bracket and the lens frame and movable in a rolling motion in both the first axis direction and the second axis direction.

14. The lens driving device according to claim 13, wherein: The third ball member directly faces the holder and the lens frame in the optical axis direction.

15. The lens driving device according to claim 13, wherein: The third guide groove portions are respectively provided in surfaces of the holder and the lens holder facing each other in the optical axis direction.

16. The lens driving device according to claim 5, wherein: The third guide groove portion has a shape different from shapes of the first guide groove portion and the second guide groove portion.

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