Lens driving device

Abstract

The utility model provides a lens driving device, which comprises a shell with an accommodating space, an elastic bracket, a circuit board assembly, a driving coil, a magnetic steel assembly and an image sensor, and is characterized in that the driving coil and the magnetic steel assembly are spaced; the driving coil comprises a first coil assembly and a second coil assembly, the first coil assembly is arranged along one diagonal line of the circuit board assembly, and the second coil assembly is arranged along the other diagonal line of the circuit board assembly; the magnetic steel assembly comprises a first magnetic steel unit spaced from the first coil assembly and a second magnetic steel unit spaced from the second coil assembly, and the first coil assembly and the first magnetic steel unit interact to drive the circuit board assembly to move in the first direction; the second coil group interacts with the second magnetic steel unit to drive the circuit board assembly to move along a second direction; the first direction and the second direction are perpendicular to each other and are both perpendicular to the optical axis direction. Compared with the prior art, the lens driving device is compact in structure and good in anti-shake driving effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to anti-shake technical field especially relates to a lens driving device. BACKGROUND

[0002] With the improvement of the shooting experience of consumers, the anti-shake function of the lens driving device is widely used in various camera devices. The combination of the lens driving device and various portable electronic devices such as mobile phones, cameras, computers and the like is also favored by consumers.

[0003] The anti-shake device of the related lens driving device generally includes a shell, a circuit board arranged in the shell, a magnetic steel or a coil fixed on the circuit board, a coil or a magnetic steel fixed to the shell, and a lens holder fixed to the circuit board; the lens module is fixed to the lens holder, and the circuit board is elastically supported by the elastic sheet; when the coil applies current, the coil and the magnetic steel group generate an electromagnetic field, and the coil is subjected to the Lorentz force of the electromagnetic field, driving the lens holder to move along the direction perpendicular to the optical axis, thereby driving the lens module to realize the anti-shake performance. However, in the anti-shake device, the driving effect of the single coil and the magnetic steel is poor, and the anti-shake effect is not good.

[0004] Therefore, it is necessary to provide a new lens driving device to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a lens driving device which has low overall cost, good driving effect and better anti-shake effect.

[0006] In order to achieve the above purpose, the utility model provides a lens driving device, which comprises a shell, an elastic support fixed in the shell, a circuit board assembly supported on the elastic support, a driving coil fixed on the circuit board assembly and electrically connected with the circuit board assembly, a magnetic steel assembly fixed to the shell, and an image sensor fixed to the circuit board assembly; the shell is provided with an opening penetrating along the optical axis direction of the image sensor, the driving coil is arranged at the corner position of the circuit board assembly, and the driving coil is spaced apart from the magnetic steel assembly;

[0007] The driving coil comprises a first coil group and a second coil group arranged in a spaced manner, the first coil group is arranged along a pair of diagonal lines of the circuit board assembly, and the second coil group is arranged along another pair of diagonal lines of the circuit board assembly; the magnet group assembly comprises a first magnet unit spaced from the first coil group and a second magnet unit spaced from the second coil group, the first magnet unit is a Halbach magnetic circuit, the first coil group interacts with the first magnet unit to drive the circuit board assembly to move in a first direction, and the second coil group interacts with the second magnet unit to drive the circuit board assembly to move in a second direction; the first direction and the second direction are perpendicular to each other and are perpendicular to the optical axis direction.

[0008] Preferably, the first coil group comprises a first coil and a second coil fixed to the circuit board assembly and arranged side by side in the first direction.

[0009] The first magnet unit comprises a first magnet, a second magnet, a third magnet, a fourth magnet, a fifth magnet and a sixth magnet fixed to the housing and arranged side by side in the first direction.

[0010] The first magnet, the second magnet and the third magnet are opposite to the first coil, and the fourth magnet, the fifth magnet and the sixth magnet are opposite to the second coil.

[0011] Preferably, the first magnet, the third magnet, the fourth magnet and the sixth magnet are magnetized along the extension direction of the optical axis direction, and the second magnet and the fifth magnet are magnetized perpendicular to the optical axis direction.

[0012] Preferably, the first coil and the second coil are integrally wound, or the first coil and the second coil are two independent coils, and the first coil and the second coil are connected in series with each other.

[0013] Preferably, the third magnet and the fourth magnet are an integrally formed structure.

[0014] Preferably, the third magnet and the fourth magnet are arranged in a split structure.

[0015] Preferably, the lens driving device further comprises a first magnetic conducting sheet, the first magnetic conducting sheet is fixed to the side of the magnet group assembly away from the driving coil in a stacked manner; the housing is provided with an opening penetrating therethrough, and the first magnetic conducting sheet is arranged in the opening.

[0016] Preferably, the lens driving device further comprises a second magnetic conducting sheet, the second magnetic conducting sheet is fixed to the housing, the second magnetic conducting sheet is located on the side of the driving coil away from the magnet group assembly, and the second magnetic conducting sheet is arranged opposite to the magnet group assembly.

[0017] Preferably, the elastic support comprises a first fixing part fixed to the shell, a second fixing part fixed to the circuit board assembly, and a connecting part connecting the first fixing part and the second fixing part.

[0018] Preferably, the circuit board assembly comprises a first circuit board and a second circuit board stacked on the first circuit board, the drive coil is fixedly connected to the second circuit board, and the first circuit board and the second circuit board are fixedly welded.

[0019] Preferably, the lens driving device further comprises shock-absorbing members oppositely arranged, and the shock-absorbing members are fixed to surfaces of the circuit board assembly away from the magnetic steel assembly.

[0020] Preferably, the lens driving device further comprises anti-collision blocks fixed to each side surface of the circuit board assembly, and the second fixing part of the elastic support is fixedly connected to the anti-collision blocks.

[0021] Preferably, the lens driving device further comprises connecting members connecting adjacent anti-collision blocks.

[0022] Compared with the prior art, in the lens driving device, the drive coil and the magnetic steel assembly are fixed to the circuit board assembly and the shell respectively, the shell is provided with an opening penetrating the shell along the optical axis direction of the image sensor, the drive coil is arranged at a corner position of the circuit board assembly, and the drive coil is spaced apart from the magnetic steel assembly; the drive coil comprises a first coil group and a second coil group arranged at intervals, the first coil group is arranged along a pair of diagonal lines of the circuit board assembly, and the second coil group is arranged along another pair of diagonal lines of the circuit board assembly; the magnetic steel assembly comprises a first magnetic unit spaced apart from the first coil group and a second magnetic unit spaced apart from the second coil group, the first magnetic unit is a Halbach magnetic circuit, the first coil group and the first magnetic unit interact to drive the circuit board assembly to move in a first direction, and the second coil group and the second magnetic unit interact to drive the circuit board assembly to move in a second direction; the first direction and the second direction are perpendicular to each other and are both perpendicular to the optical axis direction; through the specific structure of the coil and the magnetic steel, the driving force can be increased in a micro space, so that the driving anti-shake effect of the lens driving device is good. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. 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 from these drawings without creative labor, wherein:

[0024] Figure 1The utility model provides a stereogram structure schematic diagram of lens drive arrangement provided for the embodiment of the utility model,

[0025] Figure 2 The utility model provides a partial structure exploded view of lens drive arrangement provided for the embodiment of the utility model,

[0026] Figure 3 The utility model provides a stereogram structure exploded view of lens drive arrangement provided for the embodiment of the utility model,

[0027] Figure 4 For Figure 1 The section along A-A line in,

[0028] Figure 5 For Figure 1 The section along B-B line in.

[0029] Figure 6 The utility model provides a magnetic pole structure schematic diagram of first magnetic steel unit provided for the embodiment of the utility model,

[0030] Figure 7 The utility model provides a structure schematic diagram of elastic support provided for the embodiment of the utility model.

[0031] In the figure, 100, lens drive arrangement, 1, shell, 101, bottom cover, 102, upper cover, 103, opening, 104, aperture, 2, elastic support, 21, first fixed part, 22, second fixed part, 23, connecting part, 3, circuit board assembly, 31, first circuit board, 32, second circuit board, 33, through -hole, 4, drive coil, 41, first coil group, 411, first coil, 412, second coil, 42, second coil group, 5, magnetic steel assembly, 51, first magnetic steel unit, 511, first magnetic steel, 512, second magnetic steel, 513, third magnetic steel, 514, fourth magnetic steel, 515, fifth magnetic steel, 516, sixth magnetic steel, 52, second magnetic steel unit, 6, first magnetic conducting sheet, 7, second magnetic conducting sheet, 8, shock -absorbing spare, 9, anti -collision block, 91, first anti -collision block, 92, second anti -collision block, 93, connecting piece, 10, conductive connecting plate, 11, frame, 12, image sensor, 13, optical filter, 14, first drive chip, 15, second drive chip, 16, sensor support. DETAILED DESCRIPTION

[0032] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.

[0033] Combining Figures 1 to 7 The utility model embodiment provides a lens drive device 100, including casing 1, fixed in the elastic support 2 of casing 1, support the circuit board assembly 3 of elastic support 2, stack fixed in the drive coil 4 of circuit board assembly 3 and with circuit board assembly 3 electricity connection, fixed in the magnetic steel component 5 of casing 1, and fixed in the image sensor 12 of circuit board assembly 3. The opening 103 of image sensor 12's optical axis direction is through on it, the drive coil 4 is arranged in the corner position of circuit board assembly, and the drive coil 4 is spaced apart with magnetic steel component 5.

[0034] Optionally, the lens drive device 100 further comprises a frame 11 and a filter 13, the frame 11 is opposite to the opening 103 and is fixed to the circuit board assembly 3, and the filter 13 is fixedly installed on the frame 11.

[0035] Specifically, the drive coil 4 includes a first coil group 41 and a second coil group 42 arranged at intervals; the first coil group 41 is arranged along a pair of diagonal lines of the circuit board assembly 3, and the second coil group 42 is arranged along another pair of diagonal lines of the circuit board assembly 3; the magnetic steel component 5 includes a first magnetic unit 51 spaced apart from the first coil group 41 and a second magnetic unit 52 spaced apart from the second coil group 42, the first magnetic unit 51 is a Halbach magnetic circuit, the first coil group 41 interacts with the first magnetic unit 51 to drive the circuit board assembly 3 to move in a first direction (X-axis); the second coil group 42 interacts with the second magnetic unit 52 to drive the circuit board assembly 3 to move in a second direction (Y-axis); the first direction and the second direction are perpendicular to each other, and both are perpendicular to the optical axis direction. By arranging multiple coil groups and multiple magnetic steel groups, the driving force can be increased in a miniature space, so that the driving anti-shake effect of the lens drive device 100 is good.

[0036] Optionally, the lens drive device 100 further comprises a first drive chip 14 and a second drive chip 15, the first drive chip 14 is arranged in the first coil group 41, and the second drive chip 15 is arranged in the second coil group 42. The first drive chip 14 is used for controlling the first coil group 41 to move in the first direction. The second drive chip 15 is used for controlling the second coil group 42 to move in the second direction.

[0037] In this embodiment, the first coil group 41 includes a first coil 411 and a second coil 412 fixed to the circuit board assembly 3 and arranged side by side along the first direction, and the first driving chip 45 is located in the first coil 411. The first magnetic steel unit 51 includes a first magnetic steel 511, a second magnetic steel 512, a third magnetic steel 513, a fourth magnetic steel 514, a fifth magnetic steel 515, and a sixth magnetic steel 516 fixed to the housing 1 and arranged side by side along the first direction. The first magnetic steel 511, the second magnetic steel 512, and the third magnetic steel 513 are fixedly connected and opposite to the first coil 411; the fourth magnetic steel 514, the fifth magnetic steel 514, and the sixth magnetic steel 516 are fixedly connected and opposite to the second coil 412. By arranging multiple coil groups and multiple magnetic steel groups, the driving force can be increased in a micro space, so that the driving anti-shake effect of the lens driving device 100 is good.

[0038] In this embodiment, as shown in Figure 6 The first magnetic steel 511, the third magnetic steel 512, the fourth magnetic steel 514, and the sixth magnetic steel 516 are magnetized along the extension direction of the optical axis direction, and the second magnetic steel 512 and the fifth magnetic steel 515 are magnetized perpendicular to the optical axis direction.

[0039] Specifically, the magnetic poles of the first magnetic steel 511 and the sixth magnetic steel 516 away from the driving coil 4 are N poles, and the magnetic poles of the first magnetic steel 511 and the sixth magnetic steel 516 close to the driving coil 4 are S poles. The magnetic poles of the third magnetic steel 513 and the fourth magnetic steel 514 away from the driving coil 4 are S poles, and the magnetic poles of the third magnetic steel 513 and the fourth magnetic steel 514 close to the driving coil 4 are N poles. The side of the second magnetic steel 512 close to the first magnetic steel 511 is an N pole, and the side of the second magnetic steel 512 away from the first magnetic steel 511 is an S pole. The side of the fifth magnetic steel 515 close to the sixth magnetic steel 516 is an N pole, and the side of the fifth magnetic steel 515 away from the sixth magnetic steel 516 is an S pole.

[0040] In this embodiment, the second coil group 42 is a coil welded on the circuit board assembly 3, and the second magnetic steel unit 52 includes three magnetic steels, so that the cost can be saved to a certain extent while ensuring sufficient driving force.

[0041] In other embodiments, the second magnetic steel unit 52 can also be a Halbach magnetic circuit, and the coils of the second coil group 42 are also arranged corresponding to the second magnetic steel unit 52. In this way, the lens driving device 100 has excellent driving force in the X direction and the Y direction, and the anti-shake effect is better.

[0042] In this embodiment, the first coil 411 is at least partially or completely projected onto the second coil 412.

[0043] In this embodiment, the first coil 411 and the second coil 412 are integrally wound, or the first coil 411 and the second coil 412 are two independent coils, and the first coil 411 and the second coil 412 are connected in series. Integrally winding can save two solder pads and save installation space.

[0044] In this embodiment, the third magnetic steel 513 and the fourth magnetic steel 514 are integrally formed.

[0045] In this embodiment, the second magnetic steel 513 and the third magnetic steel 514 are provided in a split structure. This facilitates the installation of the third magnetic steel 513 and the fourth magnetic steel 514, and improves the magnetic field performance.

[0046] In this embodiment, the lens driving device 100 further comprises a first magnetic conducting sheet 6, which is fixed to the side of the first magnetic steel unit 51 away from the first coil group 41. The first magnetic conducting sheet 6 enhances the magnetic conducting effect of the magnetic steel. The housing 1 is provided with an opening 104 extending therethrough, and the first magnetic conducting sheet 6 is arranged in the opening 104. This facilitates the installation of the first magnetic conducting sheet 6 and saves the overall stacking space of the lens driving device 100. Optionally, the first magnetic conducting sheet 6 is completely arranged in the opening 104.

[0047] In this embodiment, the lens driving device 100 further comprises a second magnetic conducting sheet 7, which is fixed to the housing 1. The second magnetic conducting sheet 7 is located on the side of the driving coil 4 away from the magnetic steel assembly 5, and the second magnetic conducting sheet 7 is arranged opposite to the magnetic steel assembly 5. This enhances the magnetic conducting performance.

[0048] In this embodiment, the elastic support 2 comprises a first fixing portion 21 fixed to the housing 1, a second fixing portion 22 fixed to the circuit board assembly 3, and a connecting portion 23 connecting the first fixing portion 21 and the second fixing portion 22. The first fixing portion 21 is fixed to the housing 1, and the circuit board assembly 3 is fixed to the second fixing portion 22. The connecting portion 23 is used to elastically connect the first fixing portion 21 and the second fixing portion 22. When the driving coil 4 and the magnetic steel assembly 5 drive each other, the image sensor 12 moves to realize anti-shake.

[0049] In this embodiment, the circuit board assembly 3 comprises a first circuit board 31 and a second circuit board 32 stacked on the first circuit board 31, the first circuit board 31 is welded and fixed with the second circuit board 32, and the driving coil 4 is fixedly connected to the second circuit board 32. Optionally, the driving coil 4 is welded and fixed to the second circuit board 32. The first circuit board 31 is a PCB printed circuit board, and the second circuit board 32 is a FPC flexible circuit board. By welding the driving coil 4 to the second circuit board 32, the bad output motion of the second circuit board 32 can be reduced, and the control line is processed separately and then combined with the first circuit board 31.

[0050] In this embodiment, the lens driving device 100 further comprises a shock-absorbing member 8 arranged oppositely, and the shock-absorbing member 8 is fixed to the surface of the circuit board assembly 3 away from the magnet steel assembly 5. The shock-absorbing member 8 can be used for shock-absorbing effect of the moving circuit board assembly 3. Optionally, the shock-absorbing member 8 can also be fixed to the four corner positions of the surface of the circuit board assembly 3 away from the magnet steel assembly 5, and the shock-absorbing effect is better.

[0051] In this embodiment, the shock-absorbing member 8 can be made of silica gel or rubber material.

[0052] In this embodiment, the lens driving device 100 further comprises an anti-collision block 9 fixed to each side of the circuit board assembly 3, and the second fixing part 22 of the elastic support 2 is fixedly connected to the anti-collision block 9. The anti-collision block 9 comprises a first anti-collision block 91 fixed to two opposite sides of the circuit board assembly 3 and a second anti-collision block 92 fixed to the other two opposite sides of the circuit board assembly 3. The frame 11 is located between the first anti-collision block 91 and the second anti-collision block 92. The first anti-collision block 91 and the second anti-collision block 92 can also be used to limit the rotation position of the circuit board assembly 3, so as to prevent the image sensor 12 from rotating too much. Optionally, the first anti-collision block 91 and the second anti-collision block 92 have a large contact area with the elastic support 2, so as to improve the stability of the first anti-collision block 91 and the second anti-collision block 92.

[0053] In this embodiment, the lens driving device 100 further comprises a connecting member 93, both ends of the connecting member 93 are fixed to the first anti-collision block 91 and the second anti-collision block 92 respectively, so as to be connected as a whole, and the stability is improved.

[0054] In this embodiment, the shell 1 comprises a bottom cover 101 and an upper cover 102 fixed to the bottom cover 101, and the elastic support 2 is fixed to the bottom cover 101. The magnet steel assembly 5 is fixed to the upper cover 102. The opening 103 is formed in the upper cover 102.

[0055] The lens driving device 100 further comprises a conductive connecting plate 10, one end of the conductive connecting plate 10 is fixed to the circuit board assembly 3, and the other end of the conductive connecting plate 10 extends to the outside of the shell 1 and is used for connecting with an external power supply.

[0056] The lens driving device 100 further comprises a sensor support 16 fixed to the second circuit board 32, the sensor support 16 is fixed to the second circuit board 32 and covers the through hole 33, and the image sensor 10 is fixed to one side of the sensor support 16 towards the opening 103 and is located in the through hole 33.

[0057] Compared with the prior art, in the lens driving device, the driving coil and the magnetic steel assembly are fixed on the circuit board assembly and the shell respectively, the shell is provided with an opening penetrating along the optical axis direction of the image sensor, the driving coil is arranged at the corner position of the circuit board assembly, and the driving coil is spaced apart from the magnetic steel assembly; the driving coil comprises a first coil group and a second coil group which are arranged at intervals, the first coil group is arranged along a pair of diagonal lines of the circuit board assembly, and the second coil group is arranged along another pair of diagonal lines of the circuit board assembly; the magnetic steel assembly comprises a first magnetic unit spaced apart from the first coil group and a second magnetic unit spaced apart from the second coil group, the first magnetic unit is a Halbach magnetic circuit, the first coil group and the first magnetic unit interact to drive the circuit board assembly to move in a first direction; the second coil group and the second magnetic unit interact to drive the circuit board assembly to move in a second direction; the first direction and the second direction are perpendicular to each other and are both perpendicular to the optical axis direction; through the specific structure of the coil and the magnetic steel, the driving force can be increased in the miniature space, so that the driving anti-shake effect of the lens driving device is good.

[0058] The above only describes the embodiments of the utility model, and it should be pointed out that for ordinary skilled persons in the art, improvements can be made without departing from the creative concept of the utility model, but these all belong to the protection scope of the utility model.

Claims

1. A lens driving device, comprising a housing, an elastic bracket fixed within the housing, a circuit board assembly supported on the elastic bracket, a drive coil stacked and fixed to the circuit board assembly and electrically connected to the circuit board assembly, a magnet assembly fixed to the housing, and an image sensor fixed to the circuit board assembly; the housing has an opening extending through it along the optical axis of the image sensor, the drive coil is disposed at a corner position of the circuit board assembly, and the drive coil is spaced apart from the magnet assembly; characterized in that, The driving coil includes a first coil group and a second coil group spaced apart. The first coil group is arranged along one diagonal of the circuit board assembly, and the second coil group is arranged along the other diagonal of the circuit board assembly. The magnet assembly includes a first magnet unit spaced apart from the first coil group and a second magnet unit spaced apart from the second coil group. The first magnet unit is a Helbeck magnetic circuit. The first coil group interacts with the first magnet unit to drive the circuit board assembly to move along a first direction. The second coil group interacts with the second magnet unit to drive the circuit board assembly to move along a second direction. The first direction and the second direction are perpendicular to each other and both are perpendicular to the optical axis direction.

2. The lens driving device according to claim 1, characterized in that, The first coil group includes a first coil and a second coil fixed to the circuit board assembly and arranged side by side along the first direction; The first magnet unit includes a first magnet, a second magnet, a third magnet, a fourth magnet, a fifth magnet, and a sixth magnet that are fixed to the housing and arranged side by side along the first direction; The first magnet, the second magnet, and the third magnet are directly opposite the first coil, and the fourth magnet, the fifth magnet, and the sixth magnet are directly opposite the second coil.

3. The lens driving device according to claim 2, characterized in that, The first magnet, the third magnet, the fourth magnet, and the sixth magnet are all magnetized along the extension direction of the optical axis, while the second magnet and the fifth magnet are magnetized along a direction perpendicular to the optical axis.

4. The lens driving device according to claim 2, characterized in that, The first coil and the second coil are integrally wound; or the first coil and the second coil are two independent coils, and the first coil and the second coil are connected in series.

5. The lens driving device according to claim 2, characterized in that, The third magnet and the fourth magnet are integrally formed.

6. The lens driving device according to claim 2, characterized in that, The third magnet and the fourth magnet are configured as separate structures.

7. The lens driving device according to claim 1, characterized in that, The lens driving device further includes a first magnetic sheet, which is stacked and fixed on the side of the magnet assembly away from the driving coil; the housing has an opening therethrough, and the first magnetic sheet is disposed in the opening.

8. The lens driving device according to claim 1, characterized in that, The lens driving device further includes a second magnetic sheet, which is fixed to the housing. The second magnetic sheet is located on the side of the driving coil away from the magnet assembly, and the second magnetic sheet is positioned opposite the magnet assembly.

9. The lens driving device according to claim 1, characterized in that, The elastic bracket includes a first fixing part fixed to the housing, a second fixing part fixed to the circuit board assembly, and a connecting part connecting the first fixing part and the second fixing part.

10. The lens driving device according to claim 1, characterized in that, The circuit board assembly includes a first circuit board and a second circuit board stacked on the first circuit board. The drive coil is fixedly connected to the second circuit board, and the first circuit board and the second circuit board are soldered and fixed together.

11. The lens driving device according to claim 1, characterized in that, The lens driving device also includes a shock absorber disposed opposite to the circuit board assembly on the surface away from the magnet assembly.

12. The lens driving device according to claim 9, characterized in that, The lens driving device also includes anti-collision blocks fixed to each side of the circuit board assembly, and the second fixing part of the elastic bracket is fixedly connected to the anti-collision blocks.

13. The lens driving device according to claim 12, characterized in that, The lens driving device also includes a connector that connects adjacent anti-collision blocks.

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