Lens driving device

Abstract

The application provides a lens driving device, which comprises a base, a support frame, a lens barrel support and an elastic component; the elastic component comprises a first fixed arm, a second fixed arm and a plurality of elastic arms connecting the first fixed arm and the second fixed arm; each elastic arm comprises a first elastic bending part and a plurality of second elastic bending parts; the curvature radius of the first elastic bending part is greater than that of the second elastic bending part; the lens driving device further comprises a plurality of damping rubbers, each of which is arranged between the first elastic bending part and the support frame; the surface of the support frame corresponding to the first elastic bending part is convex towards the first elastic bending part to form a fixed structure for fixing the damping rubber, and the first elastic bending part and the fixed structure are fixedly connected through the damping rubber, wherein the damping rubber at least partially covers the first elastic bending part. Compared with the related art, the lens driving device has good anti-shake effect and low production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to a driving device, in particular to a lens driving device. BACKGROUND

[0002] With the development of camera technology, lens driving devices are widely used in various camera devices. The combination of lens driving devices with various portable electronic devices such as mobile phones, cameras, computers, etc. is also favored by consumers.

[0003] The driving mechanism of the lens driving device of the related art is usually formed by a coil and a magnetic steel to form a driving structure, a support frame is supported on the bottom of the seat, the driving coil and the driving magnetic steel are fixed on the lens barrel support and the support frame respectively, and the lens barrel support is supported on the support frame through the upper elastic sheet. The OIS coil (anti-shake coil) is fixed on the shell and located above the support frame, the anti-shake magnetic steel is fixed on the side of the support frame away from the base, and the damping glue is added between the support frame and the lens barrel support for the anti-shake effect of the lens barrel. When the driving coil applies current, the driving coil and the driving magnetic steel generate an electromagnetic field, the driving coil is subjected to the Lorentz force of the electromagnetic field, and the driving magnetic steel is driven to move linearly along the optical axis direction of the lens barrel, thereby driving the lens barrel to move along the optical axis direction. When the anti-shake coil applies current, the anti-shake coil and the anti-shake magnetic steel generate an electromagnetic field, the anti-shake coil is subjected to the Lorentz force of the electromagnetic field, and the anti-shake magnetic steel is driven to move perpendicular to the optical axis direction, thereby driving the lens barrel to realize the OIS anti-shake performance.

[0004] However, in the lens driving device of the related art, since the damping glue is added between the lens barrel support and the support frame, there are risks such as difficult control of the amount of glue, instability affected by the stroke, reliability failure, etc. The damping glue is located in the gap between the support frame and the lens barrel support, in a suspended position, and the lens barrel in the lens barrel support moves up and down with a large stroke during normal focusing work or falling process. The position and shape of the damping glue are pulled along with the movement of the lens barrel support, which has the risk of breaking or displacement. In addition, when there is a deviation between the support frame and the lens barrel support gap, the amount of glue and consistency are poor, which increases the production cost.

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

[0006] The technical problem to be solved by the present application is to provide a lens driving device with small size, simple assembly, good stability and reduced production cost.

[0007] To solve the above technical problems, the present application provides a lens driving device, which comprises:

[0008] a base;

[0009] A support frame having a receiving space, the support frame supported on the base;

[0010] A lens barrel holder received in the receiving space for mounting a lens barrel having an optical axis;

[0011] A resilient assembly fixed to the support frame to resiliently support the lens barrel holder in the receiving space along the direction of the optical axis, characterized in that

[0012] The resilient assembly comprises a first fixed arm fixed to the support frame, a second fixed arm fixed to the lens barrel holder, and a plurality of elastic arms connecting the first fixed arm and the second fixed arm, the elastic arms being spaced apart from the support frame along the direction of the optical axis; each of the elastic arms comprises a first elastic bending portion directly bending and extending from the first fixed arm towards the lens barrel holder, and a plurality of second elastic bending portions bending and extending from the first elastic bending portion towards the lens barrel holder and connected to the second fixed arm; the curvature radius of the first elastic bending portion is greater than that of the second elastic bending portion.

[0013] The lens driving device further comprises a plurality of damping rubbers, each of the damping rubbers being arranged between the first elastic bending portion and the support frame; the surface of the support frame corresponding to the first elastic bending portion is convex towards the first elastic bending portion along the direction of the optical axis to form a fixing structure for fixing the damping rubber, the first elastic bending portion and the fixing structure being fixedly connected through the damping rubber, wherein the damping rubber at least partially covers the first elastic bending portion.

[0014] Preferably, the resilient assembly comprises an upper elastic sheet fixed to the side of the support frame away from the base, and a lower elastic sheet fixed to the side of the support frame close to the base; the damping rubbers are arranged between the upper elastic sheet and the support frame.

[0015] Preferably, the support frame is rectangular, the fixing structure comprises four fixing structures respectively located at the four corners of the support frame, the upper elastic sheet comprises two upper elastic sheets spaced apart and arranged opposite to each other, each of the upper elastic sheets comprises two elastic arms spaced apart from each other, and the four first elastic bending portions are respectively corresponding to the four fixing structures one by one.

[0016] Preferably, the support frame comprises a main plastic surface recessed away from the elastic arms along the direction of the optical axis and spaced apart from the elastic arms from the surface of the support frame towards the elastic arms, the fixing structure comprises a protruding portion protruding and extending from the side of the main plastic surface close to the elastic arms towards the elastic arms, the protruding portion is arranged opposite to and spaced apart from the first elastic bending portion, and the damping rubber is attached to the protruding portion.

[0017] Preferably, the protruding portion is in a ring shape, and the damping glue is arranged in the ring-shaped region of the protruding portion.

[0018] Preferably, the fixing structure further comprises a glue groove formed by the main body being concave away from the elastic assembly, the glue groove is located in the range surrounded by the protruding portion, and the damping glue is arranged at least partially in the glue groove.

[0019] Preferably, the inner diameter of the protruding portion gradually increases from the end close to the glue groove to the end away from the glue groove.

[0020] Preferably, the damping glue completely covers the first elastic bending portion.

[0021] Preferably, the lens driving device further comprises a housing covering the base and surrounding a containing space with the base, and a suspension wire movably supporting the support frame in the containing space, one end of the suspension wire being connected to the base and the other end being connected to the elastic assembly.

[0022] Preferably, the lens driving device further comprises a vibration reduction coil fixed to the base, a magnetic steel fixed to the support frame and oppositely spaced from the vibration reduction coil, and an auto-focusing coil fixed to the lens barrel support and spaced from the magnetic steel, the vibration reduction coil and the magnetic steel interact with each other and drive the support frame to move along the direction perpendicular to the optical axis, and the auto-focusing coil and the magnetic steel interact and drive the lens barrel support to move along the direction of the optical axis.

[0023] Compared with the related art, in the lens driving device of the present application, each elastic arm comprises a first elastic bending part directly extending from the first fixed arm towards the direction close to the lens barrel support and a plurality of second elastic bending parts extending from the first elastic bending part towards the direction close to the lens barrel and connected to the second fixed arm; the curvature radius of the first elastic bending part is greater than that of the second elastic bending part, each first elastic bending part is arranged above the corresponding fixed structure and forms a gap with the corresponding fixed structure; the lens driving device further comprises a plurality of damping rubbers, each damping rubber is arranged between the first elastic bending part and the support frame; the surface of the support frame corresponding to the first elastic bending part protrudes towards the first elastic bending part to form a fixed structure for fixing the damping rubber, the first elastic bending part and the fixed structure are fixedly connected through the damping rubber, wherein the damping rubber at least partially covers the first elastic bending part. In the above structure, during normal focusing work or falling, the lens barrel moves up and down with a large stroke, but the position of the damping rubber is on the side of the elastic sheet close to the support frame along the optical axis, the first elastic bending part of the elastic assembly moves up and down with a small amount, and the damping rubber is not in the large pulling state generated by the conventional scheme, so it is more stable. When X / Y direction anti-shake work or X / Y direction falling occurs, the lens barrel support and the support frame relatively approach or move away, the damping rubber is not between the two, so it is affected to a very small extent, only the large curvature bending part moves slightly, the lens barrel support is more stable in shape, the anti-shake effect is better, and the production cost is also greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0025] Figure 1 It is a perspective view of the lens driving device of the present application;

[0026] Figure 2 It is a partial exploded view of the lens driving device of the present application;

[0027] Figure 3 It is a whole exploded view of the lens driving device of the present application;

[0028] Figure 4 It is a sectional view along line A-A in the above figure; Figure 1

[0029] Figure 5 ​for along Figure 1 a sectional view along the line B-B in figure

[0030] Figure 6 for Figure 5 a partial enlarged view of C;

[0031] Figure 7 for a partial structure diagram of the elastic assembly of the present application;

[0032] Figure 8 for a structure diagram of the support frame of the present application;

[0033] Figure 9 for a frequency response characteristic diagram of the lens driving device of the present application;

[0034] Figure 10 for a frequency response characteristic diagram of the prior art lens driving device of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Please refer to Figures 1-10 a lens driving device 100 is provided, which comprises a base 1, a support frame 2, a lens barrel support 4, an elastic assembly 5 and a flexible circuit board 11.

[0037] The support frame 2 has a receiving space 13, and the support frame 2 is supported on the base 1.

[0038] The housing 3 is covered on the base 1 and makes the support frame 2 located in the housing 3.

[0039] The lens barrel support 4 is received in the receiving space 13 and is used for mounting a lens group.

[0040] The elastic assembly 5 comprises a first fixed arm 51 fixed on the support frame 2, a second fixed arm 54 fixed on the lens barrel holder 4, and a plurality of elastic arms 14 connecting the first fixed arm 51 and the second fixed arm 54, which are arranged in the direction of the optical axis and spaced apart from the support frame 2. By fixing the first fixed arm 51 on the support frame 2 and the second fixed arm 54 on the top end of the lens barrel holder 4, the lens barrel holder 4 is connected to the support frame 2 by the elasticity of the plurality of elastic arms 14, thereby elastically supporting the lens barrel holder 4 in the accommodation space 13. In the present embodiment, each of the elastic arms 14 comprises a first elastic bending portion 52 directly bending and extending from the first fixed arm 51 towards the lens barrel holder 4, and a plurality of second elastic bending portions 53 bending and extending from the first elastic bending portion 52 towards the lens barrel holder 4 and connected to the second fixed arm 54; the curvature radius of the first elastic bending portion 52 is greater than that of the second elastic bending portion 53. The first elastic bending portion 52 is arranged close to the support frame 2, which is mainly used to bear the main deformation effect when the lens barrel holder 4 is twisted or emitted in the relative translation mode of the support frame 2. The plurality of second elastic bending portions 53 are arranged close to the lens barrel holder 4, which are mainly used for balance performance design and stress effect, and do not bear deformation. In this way, the lens barrel holder 4 is prevented from being twisted or translated by the cooperation of the first elastic bending portion 52 and the plurality of second elastic bending portions 53 under the action of the elastic assembly 5, thereby improving the anti-shake performance of the lens driving device 100.

[0041] The lens driving device 100 further comprises a plurality of damping rubbers 12, each of which is arranged between the first elastic bending portion 52 and the support frame 2; the surface of the support frame 2 corresponding to the first elastic bending portion 52 is convex towards the first elastic bending portion 52 to form a fixing structure 21 for fixing the damping rubber 12, and the first elastic bending portion 52 and the fixing structure 21 are fixedly connected through the damping rubber 12, wherein the damping rubber 12 at least partially covers the first elastic bending portion 52. During normal focusing work or falling, the lens barrel holder 4 moves up and down with a large stroke, but the position of the damping rubber 12 is on the side of the elastic sheet close to the support frame 2 along the optical axis, the first elastic bending portion 52 of the elastic assembly 5 moves up and down with a small amount, and the damping rubber 12 is not in the large pulling state generated by the conventional scheme, so it is more stable. When X / Y direction anti-shake work or X / Y direction falling occurs, the lens barrel holder 4 and the support frame 2 become relatively close or far away, the damping rubber 12 is not between them, so it is affected to a very small extent, only the large curvature bending portion moves slightly, the lens barrel holder 4 is more stable in shape, the anti-shake effect is better, and the production cost is also greatly reduced.

[0042] Each of the first elastic bending parts 52 is arranged above one of the fixing structures 21 and forms a gap with the corresponding fixing structure 21.

[0043] In the embodiment, the elastic assembly 5 includes an upper elastic sheet 15 fixed to one side of the support frame 2 away from the base 1 and a lower elastic sheet 6 fixed to one side of the support frame 2 close to the base 1; the damping rubber 12 is arranged between the upper / lower elastic sheet 6 and the support frame 2.

[0044] One end of the upper elastic sheet 15 is fixed to the top end of the support frame 2 along the optical axis direction of the lens barrel holder 4, and the other end of the upper elastic sheet 15 is fixed to the top end of the lens barrel holder 4 along the optical axis direction, so as to elastically suspend the lens barrel holder 4 in the accommodation space 13. In the embodiment, the upper elastic sheet 15 is provided with a conductive path for realizing the transmission of electrical signals. For example, the upper elastic sheet 15 is an FPC, and the conductive path is realized by a conductive circuit on the FPC.

[0045] One end of the lower elastic sheet 6 is fixed to the bottom end of the support frame 2 along the optical axis direction, and the other end of the lower elastic sheet 6 is fixed to the bottom end of the lens barrel holder 4 along the optical axis direction; the upper elastic sheet 15 and the lower elastic sheet 6 jointly elastically support the lens barrel holder 4 in the accommodation space 13. It is used to provide the restoring force of the lens barrel holder 4 when the automatic focusing (AF) function is provided.

[0046] In the embodiment, the lens driving device 100 further includes a shell 3 covering the base 1 and surrounding the base 1 to form an accommodation space, and a suspension wire 7 movably supporting the support frame 2 in the accommodation space, one end of the suspension wire 7 being connected to the base 1, and the other end being connected to the elastic assembly 5. Among them, the suspension wire 7 includes four, which are uniformly distributed at the positions of the four corners of the support frame 2, for movably suspending the support frame in the space surrounded by the shell and the base.

[0047] In the embodiment, the lens driving device 100 further includes a vibration reduction coil 9 fixed to the base 1, a magnetic steel 10 fixed to the support frame 2 and spaced apart from the vibration reduction coil 9, and an automatic focusing coil 8 fixed to the lens barrel holder 4 and spaced apart from the magnetic steel 10, the vibration reduction coil 9 and the magnetic steel 10 interact with each other and drive the support frame 2 to move along the direction perpendicular to the optical axis; the automatic focusing coil 8 and the magnetic steel 10 interact to drive the lens barrel holder 4 to move along the optical axis direction.

[0048] Among them, the lens barrel holder 4, the upper elastic sheet 15, the lower elastic sheet 6, the suspension wire 7, the automatic focusing coil 8, the vibration reduction coil 9, the magnetic steel 10 and the flexible circuit board 11 are all accommodated in the shell 3.

[0049] The suspension wires 7 are made of metal conductive material, and are arranged in multiple and spaced around the support frame 2. One end of each suspension wire 7 is fixed to the base 1, and the other end is fixed to the upper spring 15 and forms an electrical connection. The suspension wires 7 are used to provide a restoring force to the support frame 2 when providing an anti-shake function.

[0050] The anti-shake coil 9 is fixed to the base 1, and the magnetic steel 10 is fixed to the support frame 2 near the side of the lens barrel holder 4. The anti-shake coil 9 is located within the magnetic field of the magnetic steel 10 and drives the magnetic steel 10 to move in a direction perpendicular to the optical axis.

[0051] The magnetic steel 10 includes a first drive magnetic steel 101 fixed to opposite sides of the support frame 2 in a direction perpendicular to the optical axis, and a second drive magnetic steel 102 fixed to the other opposite sides of the support frame 2. Each magnetic steel 10 is single-pole magnetized. The opposite sides of the magnetic steel 10 are provided with a single magnetic pole.

[0052] The auto focus coil 8 is sleeved and fixed to the outer periphery of the lens barrel holder 4 and is spaced from the magnetic steel 10. The auto focus coil 8 is electrically connected to the upper spring 15. The magnetization direction of the magnetic steel 10 is parallel to the winding plane of the auto focus coil 8 and drives the auto focus coil 8 to move in the direction of the optical axis (Z-axis direction). By driving the lens barrel holder 4 to move in the direction of the optical axis by the auto focus coil 8, an auto focus (AF) function can be achieved. In this embodiment, the magnetization direction of the magnetic steel 10 is parallel to the winding plane of the auto focus coil 8.

[0053] Of course, the magnetization direction of each magnetic steel can also be perpendicular to the direction of the optical axis.

[0054] The anti-shake coil 9 comprises a first anti-shake coil 91 fixed to the base 1 and spaced opposite to the first driving magnetic steel 101 along a direction parallel to the optical axis, and a second anti-shake coil 92 fixed to the base 1 and spaced opposite to the second driving magnetic steel 102 along a direction parallel to the optical axis, the first anti-shake coil 91 is located in the magnetic field range of the first driving magnetic steel 101 and drives the first driving magnetic steel 101 to move along a first direction perpendicular to the optical axis, and the second anti-shake coil 92 is located in the magnetic field range of the second driving magnetic steel 102 and drives the second driving magnetic steel 102 to move along a second direction perpendicular to the optical axis, wherein the first direction and the second direction are perpendicular to each other, in the embodiment, the first direction is defined as the X-axis direction, and the second direction is defined as the Y-axis direction. That is, the first anti-shake coil 91 and the second anti-shake coil 92 are spaced and arranged in the radial direction of the lens barrel support 4. The structure arrangement makes the anti-shake coil 9 not occupy the space of the lens driving device 100 along the optical axis (Z-axis direction), effectively reduces the thickness of the lens driving device 100 along the optical axis direction, facilitates the thinness requirement of the product, and simplifies the assembly method and improves the assembly efficiency.

[0055] Preferably, the anti-shake coil 9 is pre-wound, and a plane in which the winding direction of the anti-shake coil 9 is located is perpendicular to the optical axis direction. Compared with the anti-shake driving mode of the multi-layer circuit board 11 structure in the prior art, the cost of the anti-shake driving mode formed by the structure can be greatly reduced.

[0056] In the embodiment, the flexible circuit board 11 is electrically connected with the auto-focusing coil 8 and the anti-shake coil 9 respectively.

[0057] The flexible circuit board 11 is also provided with a pin 111 part, which is convenient for connecting external signal lines.

[0058] The support frame 2 further comprises a first mounting groove 23 and a second mounting groove 24 recessed from opposite sides of the support frame 2 away from the lens barrel support 4, the first driving magnetic steel 101 is arranged in the first mounting groove 23, and the second driving magnetic steel 102 is arranged in the second mounting groove 24. The support frame 2 is used for supporting and fixing the upper spring plate 15 and the lower spring plate 6, and the first mounting groove 23 and the second mounting groove 24 are used for mounting the first driving magnetic steel 101 and the second driving magnetic steel 102 respectively, so that the first driving magnetic steel 101 and the second driving magnetic steel 102 save installation space in the lens driving device 100, and the structure of the lens driving device 100 is miniaturized as a whole.

[0059] In the embodiment, the support frame 2 is rectangular, the fixing structure 21 includes four and is located at the four corners of the support frame 2 respectively, the upper elastic sheet 15 includes two and is arranged in pairs, each upper elastic sheet 15 includes two elastic arms 14 spaced from each other. The four first elastic bending portions 52 correspond to the four fixing structures 21 respectively. In this way, the upper elastic sheet 15 is fixed on the fixing structure 21 through the damping glue 12, the fixing effect of the lens barrel holder 4 is improved, and the lens barrel holder 4 is more stable.

[0060] In the embodiment, the two upper elastic sheets 15 are arranged in pairs and jointly form a ring shape, and each upper elastic sheet 15 forms a conductive path. In this way, the positive and negative poles of the electrical signal can be transmitted. In the embodiment, the two upper elastic sheets 15 are arranged in pairs and are centrally symmetric about the lens barrel holder 4. Of course, the two upper elastic sheets 15 can also be an integral structure, and only two conductive paths need to be insulated from each other, which is easy to think of.

[0061] In the embodiment, the support frame 2 includes a main plastic surface 22 recessed away from the elastic arm 14 along the optical axis direction from the surface of the support frame 2 toward the elastic arm 14 and arranged spaced from the elastic arm 14, and the fixing structure 21 includes a protruding portion 211 protruding and extending from the side of the main plastic surface 22 close to the elastic arm 14 to the elastic arm 14, the protruding portion 211 is arranged spaced from the first elastic bending portion 52 and the damping glue 12 is attached to the protruding portion 211. By attaching and fixing the damping glue 12 on the main plastic surface 22, the support frame 2 and the upper elastic sheet 15 of the elastic assembly 5 are fixedly connected. By arranging the fixing structure 21 storing the damping glue 12 at the corresponding position of the support frame 2, a certain gap is reserved in the height direction of the upper elastic sheet 15 for the connection of the damping glue 12, and it is ensured that the upper elastic sheet 15 does not interfere with the support frame 2 during the movement of the mechanism; the protruding portion 211 of the damping glue 12 of the support frame 2 is arranged outside the position of the main plastic surface 22, which is higher than the main plastic surface 22, and there is a height difference with the surrounding structure, which ensures the shape of the damping glue 12 and prevents it from sliding along the external plane during extrusion, which is more stable.

[0062] Optionally, the protruding portion 211 is in a ring shape, and the damping glue 12 is partially arranged in the ring-shaped area of the protruding portion 211. The protruding portion 211 includes a whole ring shape, a ring shape after opening on the whole ring shape, and a ring shape surrounded by multiple protruding portions.

[0063] In the embodiment, the fixing structure 21 further comprises a glue groove 212 formed by recessing the main plastic surface 22 away from the elastic assembly 5, the glue groove 212 is located within the range surrounded by the protruding part 211, and the damping glue 12 is at least partially arranged in the glue groove 212. By arranging the glue groove 212 in the main plastic surface 22 and injecting the damping glue 12 in the glue groove 212, the fixing effect of the damping glue 12 and the support frame 2 can be increased. Preferably, the main plastic surface 22 is recessed to form the glue groove 212 away from the upper elastic sheet 15.

[0064] Specifically, the inner diameter of the protruding part 211 gradually increases from one end close to the glue groove 212 to one end away from the glue groove 212. This facilitates increasing the fixing area between the damping glue 12 and the fixing structure 21, and the fixing effect is good.

[0065] In the embodiment, the glue groove 212 is circular or square. The circular or square shape is convenient and stable in stress, and the fixing effect is good.

[0066] Of course, the glue groove 212 is not limited to the specific shapes (circular or square, etc.) described above, and can also be triangular, parallelogram, etc. As long as there is a height difference between the main plastic surface 22 and the protruding part 211, opening in the local part of the glue groove 212 also belongs to the protection scope of the present application.

[0067] In the embodiment, the damping glue 12 completely covers the first elastic bending part 52. The fixing effect between the first elastic bending part 52 and the support frame 2 is good, the elastic effect of the upper elastic sheet 15 is better, and the anti-shake effect is better. Alternatively, the damping glue 12 at least partially covers the main body or the whole of the first elastic bending part 52, which can save costs while achieving good fixing effect.

[0068] In the embodiment, the lower elastic sheet 6 comprises a third fixing arm 61 fixed to the support frame 2, a fourth fixing arm 63 fixed to the bottom end of the lens barrel holder 4, a third elastic bending part 62 connecting the third fixing arm 61 and the fourth fixing arm 63, and a fixing ring 64 fixed to the end of the fourth fixing arm 63. The fourth fixing arm 63 is fixedly connected with the bottom end of the lens barrel holder 4. The support stability of the lens barrel holder is increased.

[0069] In the embodiment, the fixing ring 64 is a circular structure.

[0070] In the embodiment, as shown in Figures 9-10 The lens driving device 100 can effectively achieve the OIS motor frequency response characteristic target through actual verification: the amplitude peak of the resonance point within 1KHz is significantly suppressed, the closed-loop debugging requirement and the anti-shake effect are met.

[0071] Compared with the related art, in the lens driving device, each elastic arm includes a first elastic bending part extending in a direction close to the lens barrel support from the first fixed arm and a plurality of second elastic bending parts extending in a direction close to the lens barrel from the first elastic bending part and connected to the second fixed arm; the curvature radius of the first elastic bending part is greater than that of the second elastic bending part, each first elastic bending part is arranged above a corresponding fixed structure and forms a gap with the corresponding fixed structure; the lens driving device further includes a plurality of damping rubbers, each damping rubber is arranged between the first elastic bending part and the support frame; the surface of the support frame corresponding to the first elastic bending part protrudes towards the first elastic bending part to form a fixed structure for fixing the damping rubber, the first elastic bending part and the fixed structure are fixedly connected through the damping rubber, and the damping rubber at least partially covers the first elastic bending part. In the above structure, the lens barrel moves up and down with a large stroke during normal focusing work or falling, but the position of the damping rubber is on the side of the elastic sheet close to the support frame along the optical axis, the first elastic bending part of the elastic assembly moves up and down with a small amount, and the damping rubber is not in the large pulling state caused by the conventional scheme, so it is more stable. When X / Y direction anti-shake work or X / Y direction falling occurs, the lens barrel support and the support frame relatively move close to or away from each other, the damping rubber is not between the two, so it is affected to a very small extent, only the large curvature bending part moves slightly, the lens barrel support is more stable, the anti-shake effect is better, and the production cost is also greatly reduced.

[0072] The above only describes the embodiments of the present application, and it should be pointed out that those skilled in the art can make improvements without departing from the concept of the present application, and these improvements are within the protection scope of the present application.

Claims

1. A lens driving device, comprising: a base; a support frame having a receiving space, the support frame supported on the base; a lens barrel holder received in the receiving space for mounting a lens barrel having an optical axis; a resilient assembly fixed to the support frame for resiliently supporting the lens barrel holder in the receiving space along an optical axis direction; characterized in that the resilient assembly comprises a first fixed arm fixed to the support frame, a second fixed arm fixed to the lens barrel holder, and a plurality of elastic arms connecting the first fixed arm and the second fixed arm, the elastic arms being spaced apart from the support frame along the optical axis direction; each of the elastic arms comprises a first elastic bending portion directly bending and extending from the first fixed arm towards the lens barrel holder, and a plurality of second elastic bending portions bending and extending from the first elastic bending portion towards the lens barrel holder and connected to the second fixed arm; the first elastic bending portion has a curvature radius greater than that of the second elastic bending portion; the lens driving device further comprises a plurality of damping rubbers, each of the damping rubbers being arranged between the first elastic bending portion and the support frame; a surface of the support frame corresponding to the first elastic bending portion is convex towards the first elastic bending portion to form a fixing structure for fixing the damping rubber, the first elastic bending portion and the fixing structure being fixedly connected through the damping rubber, wherein the damping rubber at least partially covers the first elastic bending portion.

2. The lens driving device according to claim 1, wherein the resilient assembly comprises an upper elastic sheet fixed to a side of the support frame away from the base, and a lower elastic sheet fixed to a side of the support frame close to the base; the damping rubber is arranged between the upper elastic sheet and the support frame.

3. The lens driving device according to claim 2, wherein the support frame is rectangular, the fixing structure comprises four fixing structures respectively located at four corners of the support frame, and the upper elastic sheet comprises two upper elastic sheets spaced apart and facing each other, each of the upper elastic sheets comprising two elastic arms spaced apart from each other, and the four first elastic bending portions respectively correspond to the four fixing structures one by one.

4. The lens driving device according to claim 1, wherein the support frame comprises a main plastic surface recessed away from the elastic arms along the optical axis direction and spaced apart from the elastic arms, the fixing structure comprises a protruding portion extending from a side of the main plastic surface close to the elastic arms towards the elastic arms, the protruding portion being spaced apart from the first elastic bending portion and the damping rubber being attached to the protruding portion.

5. The lens driving device according to claim 4, wherein the protruding portion has a ring structure, and the damping rubber is partially arranged in a ring region of the protruding portion.

6. The lens driving apparatus according to claim 5, wherein the fixing structure further comprises a rubber groove recessed away from the resilient assembly direction from the main plastic surface, the rubber groove being located within a range surrounded by the protruding portion, and the damping rubber being at least partially arranged in the rubber groove.

7. The lens driving apparatus according to claim 6, wherein an inner diameter of the protruding portion gradually increases from one end close to the rubber groove to an end away from the rubber groove.

8. The lens driving apparatus according to claim 1, wherein the damping rubber completely covers the first elastic bending portion.

9. The lens driving apparatus according to claim 1, wherein The lens driving device further comprises a housing covering the base and forming a containing space with the base, and a suspension wire movably supporting the support frame in the containing space, one end of the suspension wire being connected to the base and the other end being connected to the elastic assembly.

10. The lens driving apparatus according to claim 1, wherein The lens driving device further comprises a vibration-proof coil fixed to the base, a magnetic steel fixed to the support frame and oppositely spaced from the vibration-proof coil, and an auto-focusing coil fixed to the lens barrel support and spaced from the magnetic steel, the vibration-proof coil and the magnetic steel interacting with each other and driving the support frame to move along a direction perpendicular to the optical axis, and the auto-focusing coil and the magnetic steel interacting with each other and driving the lens barrel support to move along the optical axis.

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