Lens driving device

Abstract

The utility model provides a kind of lens driving device, it includes: base, support frame, lens barrel support, elastic component;And, driving component, driving component is used to drive lens barrel support movement;Driving component includes first driving component, first driving component includes focusing coil, first anti-shake coil and first magnet component;Support frame includes the frame body of rectangular shape and by connecting portion;The lens driving device further includes buffer structure, buffer structure includes track and buffer gap;First magnet component is fixed to the side of connecting portion away from lens barrel support;Lens barrel support includes lens barrel support body, by the direction of being close to support frame and being protrudingly extended to form the limiting portion of lens barrel support body, and by the positioning slot formed in the direction of optical axis and being penetrated by limiting portion;Lens driving device further includes ball, track is oppositely arranged with limiting portion and is spaced to make track and positioning slot form the movement space of ball.Compared with related art, the reliability of the utility model is good.

Description

[Technical Field]

[0001] This utility model relates to a driving device, and more particularly to a lens driving device. [Background Technology]

[0002] With the development of camera technology, lens drive mechanisms are widely used in various camera devices. The integration of lens drive mechanisms with various portable electronic devices such as mobile phones, camcorders, and computers is particularly popular with consumers. The drive mechanism of such a lens drive mechanism typically consists of a coil and a magnet forming a drive structure. A support frame is mounted on a base, and the focusing coil (AF coil) and magnet are fixed to the lens barrel support and the support frame, respectively. The OIS coil (image stabilization coil) is fixed to the housing and located above the support frame, while the image stabilization magnet is fixed to the side of the support frame away from the base. When current is applied to the image stabilization coil, an electromagnetic field is generated between the coil and the magnet. The image stabilization coil is subjected to the Lorentz force of this electromagnetic field, driving the magnet to move in a direction perpendicular to the optical axis, thereby enabling the lens barrel to achieve OIS image stabilization performance.

[0003] The lens driving device described in the related technology also includes a guide structure, which typically includes a mounting boss and ball bearings. By providing a mounting boss on the outer periphery of the lens barrel support and providing ball bearings inside the mounting boss, the movement of the lens barrel support is guided by the contact between the ball bearings and the support frame.

[0004] However, in the lens driving device described in the related technology, since the mounting boss is formed on the lens barrel support and a ball bearing is set in the mounting boss, the lens barrel support needs to move along the optical axis to achieve focusing when it realizes the focusing function. However, during the driving process of the above-mentioned driving structure, the mounting position of the magnet is not designed in coordination with the ball bearing and the mounting boss, which results in the impact force absorbed by the vibration damping structure not being effectively transmitted to the magnet. The magnet still has to directly bear a large load when falling or impacting, and the impact force of the magnet and ball bearing falling is too large, resulting in poor product reliability.

[0005] Therefore, it is necessary to provide a new lens driving device to solve the above problems. [Utility Model Content]

[0006] The technical problem to be solved by this utility model is to provide a lens driving device that effectively reduces the impact force of falling magnets and balls and improves the reliability of the product.

[0007] To solve the above-mentioned technical problems, this utility model provides a lens driving device, which includes:

[0008] The housing includes a base, a top cover disposed on the base, and a central hole passing through both the base and the top cover;

[0009] A support frame, which is a ring-shaped structure with a receiving space, is installed inside the upper cover and is movably supported on the base.

[0010] A lens barrel bracket, which is housed within the receiving space and spaced apart from the support frame, is used to mount a lens module;

[0011] An elastic component that elastically suspends the lens barrel support within the receiving space; and...

[0012] A driving assembly, wherein the driving assembly is used to drive the lens barrel support to move relative to the support frame in a direction parallel to the optical axis of the lens module; characterized in that,

[0013] The drive assembly includes a first drive assembly, which includes a focusing coil fixed to the outer periphery of the lens barrel support, a first image stabilization coil fixed to the housing, and a first magnet assembly fixed to the support frame.

[0014] The support frame includes a rectangular ring-shaped frame body and a connecting portion protruding from at least one corner of the frame body along the optical axis; the lens driving device further includes a buffer structure fixed to the connecting portion near the lens barrel support; the buffer structure includes a track recessed from the connecting portion near the lens barrel support towards the lens barrel support and a buffer gap formed on the track away from the lens barrel support, the buffer gap being located between the track and the connecting portion and extending along the optical axis; the first magnet assembly is fixed to the connecting portion away from the lens barrel support;

[0015] The lens barrel support includes a lens barrel support body, a limiting part that protrudes from the lens barrel support body toward the support frame, and a positioning groove that is recessed on the side of the limiting part toward the track, the positioning groove extending along the optical axis.

[0016] The lens driving device also includes a ball bearing, and the track and the positioning groove together form a movement space for the ball bearing, which is housed within the movement space.

[0017] Preferably, the track includes a first straight edge, a second straight edge, and a third straight edge; the end of the first straight edge near the connecting part is fixed to the connecting part, the end of the second straight edge near the connecting part is fixed to the connecting part, and the ends of the first straight edge and the second straight edge near each other are respectively fixedly connected to the opposite ends of the third straight edge and respectively form an obtuse angle with the third straight edge; the first straight edge, the second straight edge, and the third straight edge near the lens barrel support together form a track groove, and the track groove and the positioning groove together form the motion space.

[0018] Preferably, the track includes a first straight edge, a second straight edge, and an arc-shaped edge; the end of the first straight edge near the connecting part is fixed to the connecting part, the end of the second straight edge near the connecting part is fixed to the connecting part, and the ends of the first straight edge and the second straight edge near each other are respectively fixedly connected to the opposite ends of the arc-shaped edge; the first straight edge, the second straight edge, and the side of the arc-shaped edge near the lens barrel support together form a track groove, and the track groove and the positioning groove together form the motion space.

[0019] Preferably, the buffer gap extends along the track in a trapezoidal structure.

[0020] Preferably, the lens driving device further includes at least one partition plate, which is disposed in the track groove and is used to divide the motion space into at least two sub-spaces, the two sub-spaces being arranged along the optical axis.

[0021] The ball bearings comprise a plurality of balls, with one ball bearing located in each of the subspaces.

[0022] Preferably, the height of the subspace along the optical axis is defined as h, and the diameter of the ball is defined as d, satisfying the following conditions:

[0023] h≥d+0.05mm.

[0024] Preferably, the first magnet assembly includes a first magnet, a second magnet, and a first fixing plate stacked and fixed on the side of the second magnet away from the base. The first magnet and the second magnet are spaced apart on opposite sides of the first image stabilization coil along the optical axis. The orthographic projection of the focusing coil along the direction perpendicular to the optical axis at least partially falls within the area formed by the first magnet and the second magnet. The first fixing plate is fixed to the connecting portion.

[0025] Preferably, the connecting part further includes a connecting part body fixed to the frame body, a first mounting boss formed by recessing the connecting part body from the side near the second magnet toward the direction away from the second magnet, and a second mounting boss formed by recessing the connecting part body from the side away from the buffer structure toward the direction near the buffer structure, wherein the first mounting boss and the second mounting boss are in communication.

[0026] The second magnet is disposed within the first mounting boss at one end near the connecting portion;

[0027] The first fixing plate includes a first fixing plate body stacked and fixed on the side of the second magnet away from the first magnet, and a fixing part formed by bending and extending the first fixing plate body away from the lens barrel bracket; the fixing part is fixedly disposed on the second mounting boss.

[0028] Preferably, the side of the fixing part away from the buffer structure is flush with the side of the connecting part away from the buffer structure.

[0029] Preferably, the focusing coil includes a first long side and a second long side arranged at intervals along the optical axis and perpendicular to the optical axis, a first connecting side connecting one end of the first long side and one end of the second long side, a first bent side extending from the other end of the first long side toward the lens barrel support, a second bent side extending from the other end of the second long side toward the lens barrel support, and a second connecting side connecting the first bent side and the second bent side; the first long side, the first connecting side, the second long side, the second bent side, the second connecting side, and the first bent side are sequentially connected and together form a hollow region; the first image stabilization coil is disposed opposite to the hollow region; the lead of the focusing coil is electrically connected to the elastic component;

[0030] The lens barrel support also includes a relief groove formed by the recess of the lens barrel support body from the side near the second connecting edge toward the direction away from the second connecting edge; the first bent edge, the second bent edge and the second connecting edge are all disposed in the relief groove.

[0031] Preferably, the driving assembly further includes a second driving assembly, and the first driving assembly and the second driving assembly are arranged at intervals along the circumference of the lens barrel support; the second driving assembly includes a second image stabilization coil and a second magnet assembly spaced apart from the second image stabilization coil along the optical axis; the second magnet assembly is fixed to the support frame, the second image stabilization coil is fixed to the housing, the first image stabilization coil drives the lens barrel support to move along a first direction, and the second image stabilization coil drives the lens barrel support to move along a second direction, both the first direction and the second direction being perpendicular to the optical axis.

[0032] Preferably, the second magnet assembly includes a third magnet and a fourth magnet spaced apart on opposite sides of the second anti-shake coil along the optical axis, and a second fixing plate stacked and fixed to the fourth magnet; the third magnet and the fourth magnet are respectively fixed to the support frame, and one end of the second fixing plate near the connecting portion is fixed to the connecting portion.

[0033] Preferably, the frame body is an integrally formed structure or a split structure.

[0034] Compared with related technologies, the lens driving device of this utility model achieves focusing and image stabilization effects by driving the lens barrel support to move through a first driving component. This first driving component includes a focusing coil fixed to the outer periphery of the lens barrel support, a first image stabilization coil fixed to the housing, and a first magnet assembly fixed to the support frame. The support frame is installed inside the upper cover and movably supported on the base. The support frame includes a rectangular ring-shaped frame body and a connecting portion protruding along the optical axis from at least one corner of the frame body. The lens driving device also includes a buffer structure fixed to the side of the connecting portion near the lens barrel support. The buffer structure includes a track formed by a recess from the side of the connecting portion near the lens barrel support towards the direction away from the lens barrel support, and a track formed away from the lens barrel support. A buffer gap is provided on one side of the lens barrel support, the buffer gap being located between the track and the connecting part and extending along the optical axis; a first magnet assembly is fixed to the side of the connecting part away from the lens barrel support; the lens barrel support includes a lens barrel support body, a limiting part extending protruding from the lens barrel support body towards the support frame, and a positioning groove recessed from the limiting part near the track, the positioning groove extending along the optical axis; the lens drive device also includes a ball bearing, the track and the positioning groove together forming a movement space for the ball bearing, the ball bearing being housed within the movement space; this can improve the anti-separation capability of the focusing assembly in an ultra-thin lens drive device; the buffer structure can reduce the impact force of the magnet assembly and ball bearing falling, improving product reliability. [Attached Image Description]

[0035] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0036] Figure 1 This is a three-dimensional structural diagram of the lens driving device provided in Embodiment 1 of the present utility model;

[0037] Figure 2 This is an exploded view of the overall structure of the lens driving device provided in Embodiment 1 of this utility model.

[0038] Figure 3 For along Figure 1 Cross-sectional view along line AA;

[0039] Figure 4 For along Figure 1 Cross-sectional view along the BB line;

[0040] Figure 5 for Figure 4 A magnified view of part C;

[0041] Figure 6 A three-dimensional structural diagram of the buffer structure of the lens driving device provided in Embodiment 1 of this utility model;

[0042] Figure 7 An exploded view of the drive assembly of the lens drive device provided in Embodiment 1 of this utility model;

[0043] Figure 8 This is a three-dimensional structural diagram of the lens driving device provided in Embodiment 2 of the present invention;

[0044] Figure 9 For along Figure 1 Cross-sectional view along the DD line;

[0045] Figure 10 for Figure 9 A magnified view of part E in the image.

[0046] In the diagram, 100 is the lens drive unit, 1 is the housing, 110 is the base, 120 is the top cover, 130 is the central hole, 2 is the support frame, 21 is the frame body, 211 is the first frame body, 212 is the second frame body, 213 is the third frame body, 22 is the connecting part, 221 is the connecting part body, 222 is the first mounting boss, 223 is the second mounting boss, 23 is the receiving space, 3 is the lens barrel support, 31 is the lens barrel support body, 32 is the limiting part, 33 is the positioning groove, 34 is the clearance groove, 4 is the elastic component, 41 is the first fixing arm, 42 is the second fixing arm, 43 is the spring arm, 5 is the drive component, 51 is the first drive component, 511 is the focusing coil, 5111 is the first long side, 5112 is the second long side, 5113 is the first connecting side, 5114 is the second connecting side, 51 15. Hollow area; 5116. First bent edge; 5117. Second bent edge; 512. First image stabilization coil; 513. First magnet assembly; 5131. First magnet; 5132. Second magnet; 5133. First fixing plate; 51331. First fixing plate body; 51332. Fixing part; 52. Second drive assembly; 521. Second image stabilization coil; 522. Second magnet assembly; 5221. Third magnet; 5222. Fourth magnet; 5223. Second fixing plate; 6. Conductive component; 7. Ball bearing; 8. Buffer structure; 81. Track; 811. First straight edge; 812. Second straight edge; 813. Third straight edge; 82. Buffer gap; 83. Track groove; 9. Support component assembly; 10. Fixing component; 11. Partition plate; 12. Lens module; 13. Movement space;

[0047] 200. Lens drive device; 81a. Track; 811a. First straight edge; 812a. Second straight edge; 813a. Curved edge.

Detailed Implementation Methods

[0048] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0049] Example 1

[0050] Please see Figures 1-7 As shown, this utility model provides a lens driving device 100, which includes: a housing 1, a support frame 2, a lens barrel bracket 3, an elastic component 4, and a driving component 5.

[0051] The outer casing 1 includes a base 110, an upper cover 120 covering the base 110, and a central hole 130 passing through both the base 110 and the upper cover 120.

[0052] The support frame 2 has a ring-shaped structure with a receiving space 23. The support frame 2 is installed inside the upper cover 120 and is movably supported on the base 110. The movement can be by sliding or the like.

[0053] The lens barrel support 3 is housed within the receiving space 23 and spaced apart from the support frame 2, and is used to mount the lens module 12. The elastic component 4 elastically suspends the lens barrel support 3 within the receiving space 23. The drive component 5 drives the lens barrel support 3 to move relative to the support frame 2 along a direction parallel to the optical axis (Z-axis) of the lens module 12. The drive component 5 drives the lens barrel support 3 to move in the horizontal and / or vertical directions. For example, when focusing the lens module 12, the drive component 5 drives the lens barrel support 3 to move along the optical axis; when stabilizing the lens module 12, the drive component 5 drives the lens barrel support 3 to move horizontally.

[0054] In this embodiment, the driving assembly 5 includes a first driving assembly 51, which includes a focusing coil 511 fixed to the outer periphery of the lens barrel support 3, a first image stabilization coil 512 fixed to the housing 1, and a first magnet assembly 513 fixed to the support frame 2. The first magnet assembly 513 is disposed on opposite sides of the first image stabilization coil 512. Specifically, when the first magnet assembly 513 interacts with the first image stabilization coil 512, the first image stabilization coil 512 enters the hollow region 5115 of the focusing coil 511 when the first magnet assembly 513 is driven by the first image stabilization coil 512. When the first magnet assembly 513 is not driven by the first image stabilization coil 512, part of the first image stabilization coil 512 has already entered the hollow region 5115 of the focusing coil 511, which can also enhance the magnetic field driving force.

[0055] The support frame 2 includes a rectangular ring-shaped frame body 21 and a connecting portion 22 protruding from at least one corner of the frame body 21 along the optical axis. The lens drive device 100 further includes a buffer structure 8 fixed to the connecting portion 22 near the lens barrel support 3. The buffer structure 8 includes a track 81 recessed from the connecting portion 22 near the lens barrel support 3 in a direction away from the lens barrel support 3, and a buffer gap 82 formed on the track 81 away from the lens barrel support 3. The buffer gap 82 is located between the track 81 and the connecting portion 22 and extends along the optical axis. The first magnet assembly 513 is fixed to the connecting portion 22 on the side away from the lens barrel support 3.

[0056] The lens barrel support 3 includes a lens support body 31, a limiting part 32 extending from the lens support body 31 towards the support frame 2, and a positioning groove 33 recessed from the limiting part 32 near the track 81, the positioning groove 33 extending along the optical axis. The lens drive device 100 also includes a ball bearing 7, the track 81 and the positioning groove 33 together forming a movement space 13 for the ball bearing 7, the ball bearing 7 being housed within the movement space 13. The track 81 and the limiting part 32 being positioned opposite each other can guide the movement of the lens barrel support 3. The buffer structure 8 reduces the impact force of the magnet assembly and the ball bearing 7 falling, improving the reliability of the product.

[0057] In this embodiment, the track 81 includes a first straight edge 811, a second straight edge 812, and a third straight edge 813. The end of the first straight edge 811 near the connecting portion 22 is fixed to the connecting portion 22. The end of the second straight edge 812 near the connecting portion 22 is fixed to the connecting portion 22. The ends of the first straight edge 811 and the second straight edge 812 near each other are respectively fixedly connected to opposite ends of the third straight edge 813 and form obtuse angles with the third straight edge 813. The first straight edge 811, the second straight edge 812, and the third straight edge 813 near the lens barrel support 3 together form a track groove 83. The track groove 83 and the positioning groove 33 together form the motion space. By setting the track 81 as a first straight edge 811, a second straight edge 812, and a third straight edge 813, the back side of the track 81 forms an arc-shaped structure, resulting in good cushioning. Specifically, the side of the ball bearing 7 closest to the lens barrel support 3 abuts against the positioning groove 33, and the side of the ball bearing 7 furthest from the lens barrel support 3 abuts against the first straight edge 811 and the second straight edge 812 respectively. When the focusing coil 511 is driven to move along the optical axis by the first magnet assembly 513, the guiding effect is good and the ball bearing 7 can be prevented from falling, thus improving the reliability of the product.

[0058] In this embodiment, the buffer gap 82 extends along the track 81 in a trapezoidal structure. The trapezoidal structure of the buffer gap 82 provides better buffering effect. The trapezoidal structure of the buffer gap 82 allows the buffer structure 8 to resemble an arc shape, resulting in excellent buffering performance.

[0059] In this embodiment, the lens driving device 100 further includes at least one partition plate 11, which is disposed within the track groove 83. The partition plate 11 is used to divide the motion space 13 into at least two sub-spaces, and the two sub-spaces are arranged along the optical axis. Multiple balls 7 are included, with one ball 7 placed in each sub-space. Dividing the track groove 83 into at least two sub-spaces by the partition plate 11 prevents interference in the movement of the balls. Each sub-space contains one ball 7, and the back side of the track 81 has a buffer structure 8, which reduces the impact force on the first magnet assembly 513 and the balls 7 during drop tests, improving product reliability.

[0060] Optionally, there can be multiple partitions 11. For example, if there are N partitions 11, where N is a positive integer and N is greater than or equal to 2, then there are N+1 subspaces.

[0061] In this embodiment, the height h of the subspace along the optical axis is defined, and the diameter d of the ball 7 is defined, satisfying the following conditions:

[0062] H≥d+0.05mm. This ensures optimal suction torque.

[0063] In this embodiment, the first magnet assembly 513 includes a first magnet 5131, a second magnet 5132, and a first fixing plate 5133 stacked and fixed on the side of the second magnet 5132 away from the base 110. The first magnet 5131 and the second magnet 5132 are spaced apart along the optical axis on opposite sides of the first image stabilization coil 512. The orthographic projection of the focusing coil 511 along the direction perpendicular to the optical axis at least partially falls within the area formed by the first magnet 5131 and the second magnet 5132. The first fixing plate 5133 is fixed to the connecting portion 22. By using the first magnet assembly 513 as a shared magnetic circuit for the focusing coil 511 and the first image stabilization coil 512, the installation space of the magnetic circuit can be saved. Meanwhile, by using the first magnet 5131 and the second magnet 5132 to install on opposite sides of the first image stabilization coil 512, and with the focusing coil 511 directly opposite the first magnet 5131 and the second magnet 5132, the overall magnetic field performance of the first magnet assembly 513 is increased, thereby enhancing the driving force and making the focusing and image stabilization effects of the lens barrel bracket 3 good.

[0064] In this embodiment, the connecting portion 22 further includes a connecting portion body 221 fixed to the frame body 21, a first mounting boss 222 formed by recessing the connecting portion body 221 from the side near the second magnet 5132 toward the direction away from the second magnet 5132, and a second mounting boss 223 formed by recessing the connecting portion body 221 from the side away from the buffer structure 8 toward the direction near the buffer structure 8. The first mounting boss 222 and the second mounting boss 223 communicate with each other. One end of the second magnet 5132 near the connecting portion 22 is disposed within the first mounting boss 222.

[0065] The first fixing plate 5133 includes a first fixing plate body 51331 stacked and fixed to the side of the second magnet 5132 away from the first magnet 5131, and a fixing part 51332 formed by bending and extending the first fixing plate body 51331 away from the lens barrel support 3; the fixing part 51332 is fixedly disposed on the second mounting boss 223. This improves the fixing performance of the second magnet 5132 and the first fixing plate 5133 to the support frame 2.

[0066] Optionally, the first fixing plate 5133 can be made of a magnetically conductive material, which can increase the overall magnetic field strength and the fixing performance of the second magnet 5132. The first fixing plate 5133 can also be made of a non-magnetically conductive material, which can increase the fixing effect of the second magnet 5132.

[0067] In this embodiment, the side of the fixing part 51332 away from the buffer structure 8 is flush with the side of the connecting part 22 away from the buffer structure 8. This saves installation space and makes the lens driving device 100 more miniaturized.

[0068] In this embodiment, the focusing coil 511 includes a first long side 5111 and a second long side 5112 arranged at intervals along the optical axis and perpendicular to the optical axis, a first connecting side 5113 connecting one end of the first long side 5111 and one end of the second long side 5112, a first bent side 5116 extending from the other end of the first long side 5111 towards the lens barrel support 3, a second bent side 5117 extending from the other end of the second long side 5112 towards the lens barrel support 3, and a second connecting side 5114 connecting the first bent side 5116 and the second bent side 5117. The first long side 5111, the first connecting side 5113, the second long side 5112, the second bent side 5117, the second connecting side 5114, and the first bent side 5116 are connected in sequence and together form a hollow region 5115; the first image stabilization coil 512 is disposed opposite to the hollow region 5115; the lead of the focusing coil 511 is electrically connected to the elastic component 4.

[0069] In this configuration, the first long side 5111 and the second long side 5112 of the focusing coil 511 are respectively directly opposite the first magnet 5131 and the second magnet 5132; optionally, the first long side 5111 and the second long side 5112 of the focusing coil 511 are respectively partially directly opposite the first magnet 5131 and the second magnet 5132. Alternatively, the first long side 5111 and the second long side 5112 of the focusing coil 511 are respectively completely directly opposite the first magnet 5131 and the second magnet 5132. Optionally, the orthographic projection of the first long side 5111 along the direction perpendicular to the optical axis refers to the orthographic projection onto the first magnet 5131 along the direction perpendicular to the optical axis. The orthographic projection of the second long side 5112 along the direction perpendicular to the optical axis refers to the orthographic projection onto the second magnet 5132 along the direction perpendicular to the optical axis.

[0070] The lens barrel support 3 also includes a relief groove 34 formed by the recess of the lens support body 31 from the side near the second connecting edge 5114 toward the direction away from the second connecting edge 5114; the first bent edge 5116, the second bent edge 5117, and the second connecting edge 5114 are all disposed within the relief groove 34. This saves installation space for the focusing coil 511.

[0071] In this embodiment, the lens driving device 100 further includes a fixing member 10, which is fixed to the inner sides of the first image stabilization coil 512 and the housing on opposite sides perpendicular to the optical axis. This improves the fixation performance of the first image stabilization coil 512. Optionally, the fixing member 10 is fixed to the base 110.

[0072] In this embodiment, the driving component 5 further includes a second driving component 52. The first driving component 51 and the second driving component 52 are arranged circumferentially around the lens barrel support 3. The second driving component 52 includes a second image stabilization coil 521 and a second magnet component 522 spaced apart from the second image stabilization coil 521 along the optical axis. The second magnet component 522 is fixed to the support frame 2, and the second image stabilization coil 521 is fixed to the outer shell 1. The first image stabilization coil 512 drives the lens barrel support 3 to move along a first direction, and the second image stabilization coil 521 drives the lens barrel support 3 to move along a second direction. Both the first and second directions are perpendicular to the optical axis. The first direction is the Y-axis direction, and the second direction is the X-axis direction. By driving the lens barrel support 3 to move along the Y-axis and X-axis directions respectively by the first driving component 51 and the second driving component 52, a horizontal lens stabilization effect is achieved. By arranging the third magnet 5221 and the fourth magnet 5222 at intervals on opposite sides of the second image stabilization coil 521, the overall magnetic field performance of the third magnet 5221 and the fourth magnet 5222 is increased, thereby enhancing the driving force and making the image stabilization effect of the lens barrel bracket 3 good.

[0073] In this embodiment, the elastic component 4 includes a first fixed arm 41 fixed to the support frame 2, a second fixed arm 42 fixed to the lens barrel bracket 3, and a spring arm 43 elastically connecting the first fixed arm 41 and the second fixed arm 42. The second fixed arm 42 is electrically connected to the lead wire of the focusing coil 511.

[0074] In this embodiment, the second magnet assembly 522 includes a third magnet 5221 and a fourth magnet 5222 spaced apart on opposite sides of the second anti-shake coil 521 along the optical axis, and a second fixing plate 5223 stacked and fixed to the fourth magnet 5222. The third magnet 5221 and the fourth magnet 5222 are respectively fixed to the support frame 2, and one end of the second fixing plate 5223 near the connecting portion 22 is fixed to the connecting portion 22. The second fixing plate 5223 has the same structure as the first fixing plate 5133 of the first magnet assembly 513, and both are fixed to the connecting portion 22, which will not be described further here.

[0075] In this embodiment, the lens driving device 100 further includes a conductive element 6, which is fixed to the base 110 on the side near the support frame 2, and is electrically connected to the elastic component 4.

[0076] In this embodiment, the frame body 21 is either an integrally formed structure or a split structure.

[0077] Specifically, the frame body 21 includes a first frame body 211, a second frame body 212, and a third frame body 213. The ends of the first frame body 211 and the second frame body 212 that are close to each other are detachably and fixedly connected via a connecting part 22. The end of the first frame body 211 away from the connecting part 22 is fixed to one end of the third frame body 213, and the end of the second frame body 212 away from the connecting part 22 is fixed to the other end of the third frame body 213. The first frame body 211, the connecting part 22, and the third frame body 213 together form a first clearance space, within which the first magnet assembly 513 is installed. The second frame body 212, the connecting part 22, and the third frame body 213 together form a second clearance space, within which the first magnet assembly 513 is installed; this saves installation space.

[0078] The first frame body 211, the second frame body 212, and the third frame body 213 are integrally formed structures; integrally formed structures are easy to manufacture and have high structural strength. The first frame body 211, the second frame body 212, and the third frame body 213 are also separately formed structures; separately formed structures are easy to assemble.

[0079] In this embodiment, the lens driving device 100 further includes support components 9. Multiple support components 9 are spaced apart from each other. Both ends of each support component 9 are fixed to a base 110 and a support frame 2, respectively, and the support frame 2 is suspended on the base 110. Optionally, the support component 9 includes a suspension system. The suspension system is spaced around the support frame 2, with one end of the suspension near the base 110 fixed to the base 110 and the other end near the support frame 2 fixed to the support frame 2. The suspension structure has high strength and provides good support.

[0080] Example 2

[0081] Please see Figures 1-10As shown, this utility model also provides a lens driving device 200. The structure of this second embodiment is basically the same as that of the first embodiment, except that in this embodiment, the track 81a includes a first straight edge 811a, a second straight edge 812a and an arc-shaped edge 813a; the end of the first straight edge 811a near the connecting part 22 is fixed to the connecting part 22, the end of the second straight edge 812a near the connecting part 22 is fixed to the connecting part 22, and the ends of the first straight edge 811a and the second straight edge 812a that are close to each other are respectively fixedly connected to the opposite ends of the arc-shaped edge 813a; the first straight edge 811a, the second straight edge 812a and the arc-shaped edge 813a near the lens barrel support 3 together form a track groove 83, and the track groove 83 and the positioning groove 33 together form the motion space 13; the buffer gap 82 is formed between the outer periphery of the track 81a and the connecting part 22. By setting the track 81a as a first straight side 811a, a second straight side 812a, and an arc-shaped side 813a, the back side of the track 81a forms an arc-shaped structure, which provides a good buffering effect.

[0082] Among them, the arc-shaped edge 813a can be an overall arc-shaped structure, or it can be an arc-shaped surface on the side near the positioning groove 33.

[0083] Compared with related technologies, the lens driving device of this utility model achieves focusing and image stabilization effects by driving the lens barrel support to move through a first driving component. This first driving component includes a focusing coil fixed to the outer periphery of the lens barrel support, a first image stabilization coil fixed to the housing, and a first magnet assembly fixed to the support frame. The support frame is installed inside the upper cover and movably supported on the base. The support frame includes a rectangular ring-shaped frame body and a connecting portion protruding along the optical axis from at least one corner of the frame body. The lens driving device also includes a buffer structure fixed to the side of the connecting portion near the lens barrel support. The buffer structure includes a track formed by a recess from the side of the connecting portion near the lens barrel support towards the direction away from the lens barrel support, and a track formed away from the lens barrel support. A buffer gap is provided on one side of the lens barrel support, the buffer gap being located between the track and the connecting part and extending along the optical axis; a first magnet assembly is fixed to the side of the connecting part away from the lens barrel support; the lens barrel support includes a lens barrel support body, a limiting part extending protruding from the lens barrel support body towards the support frame, and a positioning groove recessed from the limiting part near the track, the positioning groove extending along the optical axis; the lens drive device also includes a ball bearing, the track and the positioning groove together forming a movement space for the ball bearing, the ball bearing being housed within the movement space; this can improve the anti-separation capability of the focusing assembly in an ultra-thin lens drive device; the buffer structure can reduce the impact force of the magnet assembly and ball bearing falling, improving product reliability.

[0084] The above description is merely an embodiment of this utility model. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this utility model, but these improvements all fall within the protection scope of this utility model.

Claims

1. A lens driving device, comprising: The housing includes a base, a top cover disposed on the base, and a central hole passing through both the base and the top cover; A support frame, which is a ring-shaped structure with a receiving space, is installed inside the upper cover and is movably supported on the base. A lens barrel bracket, which is housed within the receiving space and spaced apart from the support frame, is used to mount a lens module; An elastic component that elastically suspends the lens barrel support within the receiving space; as well as, A driving assembly, wherein the driving assembly is used to drive the lens barrel support to move relative to the support frame in a direction parallel to the optical axis of the lens module; characterized in that, The drive assembly includes a first drive assembly, which includes a focusing coil fixed to the outer periphery of the lens barrel support, a first image stabilization coil fixed to the housing, and a first magnet assembly fixed to the support frame. The support frame includes a rectangular ring-shaped frame body and a connecting portion protruding from at least one corner of the frame body along the optical axis; the lens driving device further includes a buffer structure fixed to the connecting portion near the lens barrel support; the buffer structure includes a track recessed from the connecting portion near the lens barrel support towards the lens barrel support and a buffer gap formed on the track away from the lens barrel support, the buffer gap being located between the track and the connecting portion and extending along the optical axis; the first magnet assembly is fixed to the connecting portion away from the lens barrel support; The lens barrel support includes a lens barrel support body, a limiting part that protrudes from the lens barrel support body toward the support frame, and a positioning groove that is recessed on the side of the limiting part toward the track, the positioning groove extending along the optical axis. The lens driving device also includes a ball bearing, and the track and the positioning groove together form a movement space for the ball bearing, which is housed within the movement space.

2. The lens driving device according to claim 1, characterized in that, The track includes a first straight edge, a second straight edge, and a third straight edge; the end of the first straight edge near the connecting part is fixed to the connecting part, the end of the second straight edge near the connecting part is fixed to the connecting part, and the ends of the first straight edge and the second straight edge near each other are respectively fixedly connected to the opposite ends of the third straight edge and respectively form an obtuse angle with the third straight edge; the first straight edge, the second straight edge, and the third straight edge near the lens barrel support together form a track groove, and the track groove and the positioning groove together form the motion space.

3. The lens driving device according to claim 1, characterized in that, The track includes a first straight edge, a second straight edge, and an arc-shaped edge; the end of the first straight edge near the connecting part is fixed to the connecting part, the end of the second straight edge near the connecting part is fixed to the connecting part, and the ends of the first straight edge and the second straight edge near each other are respectively fixedly connected to the opposite ends of the arc-shaped edge; the first straight edge, the second straight edge, and the side of the arc-shaped edge near the lens barrel support together form a track groove, and the track groove and the positioning groove together form the motion space.

4. The lens driving device according to claim 2 or 3, characterized in that, The buffer gap extends along the track in a trapezoidal structure.

5. The lens driving device according to claim 2, characterized in that, The lens driving device further includes at least one partition plate, which is disposed in the track groove. The partition plate is used to divide the motion space into at least two sub-spaces, and the two sub-spaces are arranged along the optical axis. The ball bearings comprise a plurality of balls, with one ball bearing located in each of the subspaces.

6. The lens driving device according to claim 5, characterized in that, Let h be the height of the subspace along the optical axis, and d be the diameter of the ball, satisfying the following condition: h≥d+0.05mm.

7. The lens driving device according to claim 1, characterized in that, The first magnet assembly includes a first magnet, a second magnet, and a first fixing plate stacked and fixed on the side of the second magnet away from the base. The first magnet and the second magnet are spaced apart on opposite sides of the first image stabilization coil along the optical axis. The orthographic projection of the focusing coil along the direction perpendicular to the optical axis at least partially falls within the area formed by the first magnet and the second magnet. The first fixing plate is fixed to the connecting part.

8. The lens driving device according to claim 7, characterized in that, The connecting part further includes a connecting part body fixed to the frame body, a first mounting boss formed by recessing the connecting part body from the side near the second magnet toward the direction away from the second magnet, and a second mounting boss formed by recessing the connecting part body from the side away from the buffer structure toward the direction near the buffer structure, wherein the first mounting boss and the second mounting boss are in communication. The second magnet is disposed within the first mounting boss at one end near the connecting portion; The first fixing plate includes a first fixing plate body stacked and fixed on the side of the second magnet away from the first magnet, and a fixing part formed by bending and extending the first fixing plate body away from the lens barrel bracket; the fixing part is fixedly disposed on the second mounting boss.

9. The lens driving device according to claim 8, characterized in that, The side of the fixing part away from the buffer structure is flush with the side of the connecting part away from the buffer structure.

10. The lens driving device according to claim 1, characterized in that, The focusing coil includes a first long side and a second long side arranged at intervals along the optical axis and perpendicular to the optical axis; a first connecting side connecting one end of the first long side and one end of the second long side; a first bent side extending from the other end of the first long side toward the lens barrel support; a second bent side extending from the other end of the second long side toward the lens barrel support; and a second connecting side connecting the first bent side and the second bent side. The first long side, the first connecting side, the second long side, the second bent side, the second connecting side, and the first bent side are sequentially connected and together form a hollow region. The first image stabilization coil is disposed opposite to the hollow region. The lead of the focusing coil is electrically connected to the elastic component. The lens barrel support also includes a relief groove formed by the recess of the lens barrel support body from the side near the second connecting edge toward the direction away from the second connecting edge; the first bent edge, the second bent edge and the second connecting edge are all disposed in the relief groove.

11. The lens driving device according to claim 1, characterized in that, The driving assembly further includes a second driving assembly, and the first driving assembly and the second driving assembly are arranged circumferentially spaced along the lens barrel support; the second driving assembly includes a second image stabilization coil and a second magnet assembly spaced apart from the second image stabilization coil along the optical axis; the second magnet assembly is fixed to the support frame, the second image stabilization coil is fixed to the housing, the first image stabilization coil drives the lens barrel support to move along a first direction, and the second image stabilization coil drives the lens barrel support to move along a second direction, both the first direction and the second direction being perpendicular to the optical axis.

12. The lens driving device according to claim 11, characterized in that, The second magnet assembly includes a third magnet and a fourth magnet spaced apart on opposite sides of the second anti-shake coil along the optical axis, and a second fixing plate stacked and fixed to the fourth magnet; the third magnet and the fourth magnet are respectively fixed to the support frame, and one end of the second fixing plate near the connecting part is fixed to the connecting part.

13. The lens driving device according to claim 1, characterized in that, The frame body can be a one-piece molded structure or a split structure.

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