Anti-shake mechanism and lens module

Abstract

An anti-shake mechanism provided in the present utility model comprises a base, an image sensor assembly, an elastic member and a driving assembly, wherein the driving assembly comprises steel magnets arranged on the base and coils arranged on the image sensor assembly. Each steel magnet comprises an inner steel magnet and an outer steel magnet having opposite magnetization directions, wherein the inner steel magnet comprises a first inner magnetic portion extending in a first direction, a second inner magnetic portion extending in a second direction, and a first connecting portion connecting the first inner magnetic portion to the second inner magnetic portion; and the outer steel magnet comprises a first outer magnetic portion fixed to the first inner magnetic portion, a second outer magnetic portion fixed to the second inner magnetic portion, and a second connecting portion connecting the first outer magnetic portion to the second outer magnetic portion, the second connecting portion being fixed to the first connecting portion. The first connecting portions and the second connecting portions are arranged corresponding to corners of the base. The anti-shake mechanism provided in the present utility model has high magnetic circuit efficiency.

Description

Image stabilization mechanism and lens module Technical Field

[0001] This utility model relates to the field of optical imaging technology, and in particular to a stabilization mechanism and lens module for portable mobile terminals. Background Technology

[0002] With the rapid development of smartphones, consumers have increasingly higher demands for the image quality captured by the lens modules in smartphones and other portable mobile devices. In particular, lens modules utilize image stabilization mechanisms to help users obtain clearer images. Technical issues

[0003] In related technologies, image stabilization is achieved by moving an image sensor. Specifically, the stabilization mechanism includes a fixed base, an image sensor assembly housed within the base and movable relative to the base, a support member supporting the movement of the image sensor assembly, and a drive assembly providing driving force to the image sensor assembly. Specifically, the drive assembly typically consists of coils and magnets. To achieve image stabilization by moving the image sensor assembly in two directions, four elongated magnets are usually placed on the four sides of the base. However, even when individual elongated magnets are joined together, they are subject to repulsive forces, making corner assembly inconvenient. Corner positions cannot be fully utilized, resulting in insufficient magnetic circuit utilization, a large magnetic circuit BL (base flow ratio), and negatively impacting the magnetic field performance of the stabilization mechanism.

[0004] Therefore, it is necessary to provide a new image stabilization mechanism to solve the above-mentioned technical problems. Technical solutions

[0005] The purpose of this invention is to provide a more efficient image stabilization mechanism and lens module.

[0006] To achieve the above objectives, this utility model proposes a stabilization mechanism, comprising a base with a receiving space, an image sensor assembly suspended within the receiving space, an elastic member supporting the image sensor assembly within the receiving space, and a drive assembly for driving the image sensor assembly to move along mutually perpendicular first and second directions to achieve stabilization. The image sensor assembly includes a movable frame supported by the elastic member and an image sensor disposed on the movable frame. The drive assembly includes coils and magnet assemblies spaced apart to provide driving force. One of the coils and the magnet assembly is fixed to the base, and the other is fixed to the movable frame. The magnet assembly includes at least one magnet disposed opposite to the coil, and the magnet includes mutually fixed inner magnets. The image sensor has an inner magnet located on the side of the outer magnet close to the image sensor. The inner magnet and the outer magnet are magnetized along the optical axis of the image sensor in opposite directions. The inner magnet includes a first inner magnetic part extending along a first direction, a second inner magnetic part extending along a second direction, and a first connecting part connecting the first inner magnetic part and the second inner magnetic part. The outer magnet includes a first outer magnetic part fixed to the first inner magnetic part, a second outer magnetic part fixed to the second inner magnetic part, and a second connecting part connecting the first outer magnetic part and the second outer magnetic part. The second connecting part is fixed to the first connecting part. The first direction, the second direction, and the optical axis are perpendicular to each other. The base is rectangular, and the first connecting part and the second connecting part are located at the corners of the base.

[0007] Preferably, the inner magnet and the outer magnet are integrally formed.

[0008] Preferably, the magnet assembly includes four magnets, which are respectively disposed at the corner positions of the base and spaced apart. Along the first direction, the first inner magnetic part and the first outer magnetic part of two adjacent magnets are respectively spaced apart relative to each other; along the second direction, the second inner magnetic part and the second outer magnetic part of two adjacent magnets are respectively spaced apart relative to each other.

[0009] Preferably, both the inner magnet and the outer magnet are U-shaped. Each end of the first inner magnet is provided with a first connecting part and a second inner magnet connected to the first connecting part. The two second inner magnets are arranged opposite each other along a first direction. Each end of the first outer magnet is provided with a second connecting part and a second outer magnet connected to the first connecting part. The magnet assembly includes two magnets, which are arranged on opposite sides of the image sensor along a second direction.

[0010] Preferably, both the inner magnet and the outer magnet are U-shaped. Each end of the second inner magnet is provided with a first connecting part and a first inner magnet connected to the first connecting part. The two first inner magnets are arranged opposite each other along the second direction. Each end of the second outer magnet is provided with a second connecting part and a first outer magnet connected to the first connecting part. The magnet assembly includes two magnets, which are arranged on opposite sides of the image sensor along the first direction.

[0011] Preferably, the base includes a base and a top cover arranged at relatively intervals, and a side plate connecting the base and the top cover. The base, the top cover, and the side plate together enclose the receiving space. The driving assembly includes two sets of magnet assemblies. The top cover and the base are each provided with a set of magnet assemblies. The two magnet assemblies are arranged at relatively intervals from the coil along the optical axis.

[0012] Preferably, the drive assembly further includes a magnetic conductive sheet disposed between the top cover and the magnet and / or between the base and the magnet.

[0013] Preferably, in the two sets of magnet assemblies, the inner magnets of the magnets arranged opposite to each other have opposite magnetic poles, and the outer magnets of the magnets arranged opposite to each other have opposite magnetic poles.

[0014] Preferably, the ends of the first inner magnetic part and the first outer magnetic part are flush, and the ends of the second inner magnetic part and the second outer magnetic part are flush.

[0015] This utility model also provides a lens module, including the image stabilization mechanism as described above and a lens assembly disposed opposite to the image stabilization mechanism along the optical axis direction. The image stabilization mechanism moves relative to the lens assembly along the first direction and the second direction to achieve image stabilization. Beneficial effects

[0016] Compared with related technologies, the image stabilization mechanism provided by this utility model includes a base, an image sensor assembly suspended in the base, an elastic element supporting the image sensor assembly, and a driving assembly providing driving force to the image sensor assembly. The driving assembly includes a magnet disposed on the base and a coil disposed on the image sensor assembly. The magnet includes an inner magnet and an outer magnet with opposite magnetization directions. The inner magnet includes a first inner magnetic part extending along a first direction, a second inner magnetic part extending along a second direction, and a first connecting part connecting the first inner magnetic part and the second inner magnetic part. The outer magnet includes a first outer magnetic part fixed to the first inner magnetic part, a second outer magnetic part fixed to the second inner magnetic part, and a second connecting part connecting the first outer magnetic part and the second outer magnetic part. The second connecting part is fixed to the first connecting part. The first connecting part and the second connecting part are disposed at the corner of the base. By setting a magnet with four magnetic poles and placing the first connecting part of the inner magnet and the second connecting part of the outer magnet at the corner of the base, the corner space is fully utilized, the magnetic circuit utilization rate is significantly improved, and the magnetic circuit BL is effectively improved, thus enhancing the magnetic field performance of the image stabilization mechanism. Attached Figure Description

[0017] 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:

[0018] Figure 1 is a perspective view of the anti-shake mechanism in one embodiment of the present invention;

[0019] Figure 2 is an exploded view of the image stabilization mechanism in Figure 1;

[0020] Figure 3 is a cross-sectional view along line AA in Figure 1;

[0021] Figure 4 is a top view of part of the anti-shake mechanism in Figure 1;

[0022] Figure 5 is a three-dimensional view of the magnet in the anti-shake mechanism in Figure 1;

[0023] Figure 6 is a three-dimensional view of the elastic element in the anti-shake mechanism in Figure 1;

[0024] Figure 7 is a perspective view of the anti-shake mechanism in another embodiment of the present invention;

[0025] Figure 8 is an exploded view of the image stabilization mechanism in Figure 7;

[0026] Figure 9 is a top view of part of the anti-shake mechanism in Figure 7;

[0027] Figure 10 is a top view of the magnet in the anti-shake mechanism in Figure 7;

[0028] Figure 11 is a top view of the magnet in the anti-shake mechanism in Figure 7;

[0029] Figure 12 is a schematic diagram of the lens module provided by this utility model. The best embodiment of the present invention

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0031] As shown in Figure 12, this utility model provides a lens module 1000, which includes an image stabilization mechanism 100 and a lens assembly 200 disposed opposite each other along its optical axis Z; the image stabilization mechanism 100 moves relative to the lens assembly 200 in a plane perpendicular to the optical axis Z to achieve image stabilization, thereby improving the image quality of the lens module 1000.

[0032] As shown in Figures 2-4 and 6, the image stabilization mechanism 100 includes a base 20 having a receiving space 10, an image sensor assembly 30 suspended in the receiving space 10, an elastic member 40 supporting the image sensor assembly 30 in the receiving space 10, and a drive assembly 50 that drives the image sensor assembly 30 to move along a first direction X and a second direction Y that are perpendicular to each other, wherein the first direction X, the second direction Y and the optical axis direction Z are perpendicular to each other.

[0033] The base 20 includes a base 21 and a top cover 22 arranged at intervals along the optical axis, and a side plate 23 connecting the base 21 and the top cover 22. The base 21, the top cover 22, and the side plate 23 together form a receiving space 10. It should be noted that the top cover 22 has an opening through which light enters the image sensor assembly 30.

[0034] The image sensor assembly 30 includes a movable frame 31 supported by an elastic member 40 and an image sensor 32 fixed to the movable frame 31. Specifically, the movable frame 31 includes a steel plate 311 fixed to the elastic member 40 and spaced apart from the base 21, a circuit board 312 fixed to the steel plate, a bracket 313 fixed to the circuit board 312, and a filter 314 fixed to the bracket 313. The image sensor 32 is fixed to the steel plate 311, the circuit board 312 has a hollow structure and is arranged around the periphery of the image sensor 32, and the bracket 313 is located on the side of the circuit board 312 away from the steel plate 311 to support the filter 314 at intervals above the image sensor 32.

[0035] The elastic element 40 includes a spring piece 41 fixed to the steel sheet 311 and an FPC 42 fixed to the spring piece 41. The FPC 42 is electrically connected to the circuit board 312. Specifically, the spring piece 41 includes a first fixing part 411 fixed to the steel sheet 311, a second fixing part 412 fixed to the base 20, and an elastic part 413 connecting the first fixing part 411 and the second fixing part 412. In this embodiment, the first fixing part 411 is annular, fixed to the outer edge of the steel sheet 311 and surrounding the outside of the filter 314. The FPC 42 also includes a first conductive segment 421 fixed to the first fixing part 411, a second conductive segment 422 fixed to the elastic part 413, and a third conductive segment 423 fixed to the base 20 and electrically connected to an external circuit.

[0036] Referring to Figures 2-5, the drive assembly 50 includes a coil 51 and a magnet assembly 53 arranged at relative intervals to provide driving force. One of the coil 51 and the magnet assembly 53 is fixed to the base 20, and the other is fixed to the movable frame 31. In this embodiment, the coil 51 is fixed to the movable frame 31, and the magnet assembly 53 is fixed to the base 20. Specifically, the magnet assembly 53 includes at least one magnet 52 arranged opposite to the coil 51. The magnet 52 includes an inner magnet 521 and an outer magnet 522 fixed to each other. The inner magnet 521 is located on the side of the outer magnet 522 closer to the image sensor 32. It is understood that the inner magnet 521 and the outer magnet 522 have the same thickness and are located in the same plane, and both have the same shape. Specifically, the inner magnet 521 includes a first inner magnetic part 5211 extending along a first direction X, a second inner magnetic part 5212 extending along a second direction Y, and a first connecting part 5213 connecting the first inner magnetic part 5211 and the second inner magnetic part 5212; the outer magnet 522 includes a first outer magnetic part 5221 fixed to the first inner magnetic part 5211, a second outer magnetic part 5222 fixed to the second inner magnetic part 5212, and a second connecting part 5223 connecting the first outer magnetic part 5212 and the second outer magnetic part 5222, with the second connecting part 5223 fixed to the first connecting part 5213. The inner magnet 521 and the outer magnet 522 are magnetized along the optical axis Z of the image sensor 32 in opposite directions, and the first direction X and the second direction Y are perpendicular to the optical axis Z. The inner magnet 521 and the outer magnet 522 can be integrally formed or separately formed and then bonded together.

[0037] It is understandable that the ends of the first inner magnetic part 5211 and the first outer magnetic part 5221 are flush, and the ends of the second inner magnetic part 5212 and the second outer magnetic part 5222 are flush.

[0038] As shown in Figures 4 and 5, the base 20 is rectangular, and the first connecting part 5213 and the second connecting part 5223 are provided at the corners of the base 20.

[0039] In the image stabilization mechanism 100 of the embodiment shown in Figures 1-6, the magnet assembly 53 includes four magnets 52. The four magnets 52 are respectively disposed at both ends of the base 20 along the diagonal direction, or, more specifically, at the corner positions of the base 20 and spaced apart. It can be seen that along the first direction X, the first inner magnetic portion 5211 and the first outer magnetic portion 5221 of two adjacent magnets 52 are respectively spaced apart; along the second direction Y, the second inner magnetic portion 5212 and the second outer magnetic portion 5222 of two adjacent magnets 52 are respectively spaced apart. In this way, the first connecting portion 5213 and the second connecting portion 5223 at the corner of the magnet 52 are correspondingly disposed with the corner of the base 20, making full use of the corner position, effectively improving the utilization rate of the magnetic circuit, and enhancing the magnetic field performance of the image stabilization mechanism 100.

[0040] As shown in Figures 7-10, in another embodiment of the image stabilization mechanism 100 provided by this utility model, the magnet assembly 53 may further include two magnets 52; specifically, the two magnets 52 are disposed on opposite sides of the image sensor 32 along the first direction X; further, both the inner magnet 521 and the outer magnet 522 are U-shaped, the inner magnet 521 includes two first connecting portions 5213 respectively located at both ends of the first inner magnet portion 5211 and two second inner magnet portions 5212, each first connecting portion 5213 is connected to one second inner magnet portion 5212, and the two second inner magnet portions 5212 are disposed opposite to each other along the second direction Y; the outer magnet 522 includes two second connecting portions 5223 respectively located at both ends of the first outer magnet portion 5221 and two second outer magnet portions 5222, each second connecting portion 5223 is connected to one second outer magnet portion 5222; that is, the openings of the two magnets 52 are disposed opposite to each other.

[0041] In addition, in other embodiments, as shown in FIG11, the two magnets 52 may also be disposed on opposite sides of the image sensor 32 along the second direction Y. That is, the inner magnet 521 includes two first connecting portions 5213 and two first inner magnet portions 5211 respectively located at both ends of the second inner magnet portion 5212. The two first inner magnet portions 5211 are disposed opposite to each other along the first direction X. The outer magnet 522 includes two second connecting portions 5223 and two first outer magnet portions 5221 respectively located at both ends of the second outer magnet portion 5222.

[0042] In the embodiments provided by this utility model, the driving component 50 includes two sets of magnet components 53. The top cover 22 and the base 21 are each provided with one set of magnet components 53. The two magnet components 53 are arranged at intervals relative to the coil 51 along the optical axis. To further enhance the magnetic field performance of the anti-shake mechanism 100, the driving component 50 also includes a magnetic conductive sheet 54 disposed between the top cover 22 and the magnets 52 and / or between the base 51 and the magnets 52. Furthermore, the inner magnets 521 of the corresponding magnets 52 in the two sets of magnet components 53 have opposite magnetic poles arranged relative to each other along the optical axis Z. Similarly, the outer magnets 522 of the corresponding magnets 52 in the two sets of magnet components 53 have opposite magnetic poles. It can be understood that the two sets of magnet components 53 can simultaneously include four magnets 52, as shown in Figures 1-2; alternatively, one set of magnet components 53 can include two magnets 52, and the other set can include four magnets 52, as shown in Figures 7-8; the specific choice can be made according to actual needs.

[0043] Among them, the elastic part 413 of the spring piece 41 is arranged around the outside of the magnet 52 and spaced apart from the magnet 52.

[0044] Specifically, the coil 51 of the driving component 50 is disposed on the circuit board 312. In this embodiment, the coil 51 includes a coil substrate 511 fixed to the circuit board 312 and a coil winding 512 fixed to the coil substrate 511. Furthermore, the image sensor component 30 also includes a bracket 33 fixed to the first fixing part 411 of the spring piece 41; one end of the coil substrate 511 is fixed to the circuit board 312 and the other end is fixed to the bracket 33 to achieve support.

[0045] Compared with related technologies, the image stabilization mechanism provided by this utility model includes a base, an image sensor assembly suspended in the base, an elastic element supporting the image sensor assembly, and a driving assembly providing driving force to the image sensor assembly. The driving assembly includes a magnet disposed on the base and a coil disposed on the image sensor assembly. The magnet includes an inner magnet and an outer magnet with opposite magnetization directions. The inner magnet includes a first inner magnetic part extending along a first direction, a second inner magnetic part extending along a second direction, and a first connecting part connecting the first inner magnetic part and the second inner magnetic part. The outer magnet includes a first outer magnetic part fixed to the first inner magnetic part, a second outer magnetic part fixed to the second inner magnetic part, and a second connecting part connecting the first outer magnetic part and the second outer magnetic part. The second connecting part is fixed to the first connecting part. The first connecting part and the second connecting part are disposed at the corner of the base. By setting a magnet with four magnetic poles and placing the first connecting part of the inner magnet and the second connecting part of the outer magnet at the corner of the base, the corner space is fully utilized, the magnetic circuit utilization rate is significantly improved, and the magnetic circuit BL is effectively improved, thus enhancing the magnetic field performance of the image stabilization mechanism.

[0046] 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. An anti-shake mechanism comprising a base having a housing space, an image sensor assembly suspended in the housing space, an elastic member supporting the image sensor assembly in the housing space, and a driving assembly driving the image sensor assembly to move in first and second directions perpendicular to each other to achieve anti-shake, the image sensor assembly comprising a movable frame supported by the elastic member and an image sensor provided on the movable frame, the driving assembly comprising a coil and a magnetic steel assembly oppositely spaced to provide driving force, one of the coil and the magnetic steel assembly being fixed to the base and the other being fixed to the movable frame, characterized in that, The magnet assembly includes at least one magnet disposed opposite to the coil. The magnet includes an inner magnet and an outer magnet fixed to each other. The inner magnet is disposed on the side of the outer magnet closer to the image sensor. The inner magnet and the outer magnet are magnetized along the optical axis of the image sensor and in opposite directions. The inner magnet includes a first inner magnetic part extending along a first direction, a second inner magnetic part extending along a second direction, and a first connecting part connecting the first inner magnetic part and the second inner magnetic part. The outer magnet includes a first outer magnetic part fixed to the first inner magnetic part, a second outer magnetic part fixed to the second inner magnetic part, and a second connecting part connecting the first outer magnetic part and the second outer magnetic part. The second connecting part is fixed to the first connecting part. The first direction, the second direction, and the optical axis are perpendicular to each other. The base is rectangular, and the first connecting part and the second connecting part are disposed at the corners of the base.

2. The image stabilization mechanism according to claim 1, characterized in that, The inner magnet and the outer magnet are integrally formed.

3. The image stabilization mechanism according to claim 1, characterized in that, The magnet assembly includes four magnets, which are respectively located at the corners of the base and spaced apart. Along the first direction, the first inner magnetic part and the first outer magnetic part of two adjacent magnets are respectively spaced apart. Along the second direction, the second inner magnetic part and the second outer magnetic part of two adjacent magnets are respectively spaced apart.

4. The image stabilization mechanism according to claim 1, characterized in that, Both the inner magnet and the outer magnet are U-shaped. Each end of the first inner magnet is provided with a first connecting part and a second inner magnet connected to the first connecting part. The two second inner magnets are arranged opposite each other along a first direction. Each end of the first outer magnet is provided with a second connecting part and a second outer magnet connected to the first connecting part. The magnet assembly includes two magnets, which are arranged on opposite sides of the image sensor along a second direction.

5. The image stabilization mechanism according to claim 1, characterized in that, Both the inner magnet and the outer magnet are U-shaped. Each end of the second inner magnet is provided with a first connecting part and a first inner magnet connected to the first connecting part. The two first inner magnets are arranged opposite each other along the second direction. Each end of the second outer magnet is provided with a second connecting part and a first outer magnet connected to the first connecting part. The magnet assembly includes two magnets, which are arranged on opposite sides of the image sensor along the first direction.

6. The image stabilization mechanism according to claim 1, characterized in that, The base includes a base and a top cover arranged at relative intervals, and a side plate connecting the base and the top cover. The base, the top cover, and the side plate together enclose the receiving space. The driving assembly includes two sets of magnet assemblies. The top cover and the base are each provided with a set of magnet assemblies. The two magnet assemblies are arranged at relative intervals with the coil along the optical axis.

7. The image stabilization mechanism according to claim 6, characterized in that, The drive assembly further includes a magnetic conductive sheet disposed between the top cover and the magnet and / or between the base and the magnet.

8. The image stabilization mechanism according to claim 6, characterized in that, In the two sets of magnet assemblies, the inner magnets of the opposing magnets have opposite magnetic poles, and the outer magnets of the opposing magnets in the two sets of magnet assemblies have opposite magnetic poles.

9. The image stabilization mechanism according to claim 1, characterized in that, The ends of the first inner magnetic part and the first outer magnetic part are flush, and the ends of the second inner magnetic part and the second outer magnetic part are flush.

10. A lens module, characterized in that, The device includes the image stabilization mechanism as described in claim 1 and a lens assembly disposed opposite to the image stabilization mechanism along the optical axis direction, wherein the image stabilization mechanism moves relative to the lens assembly along the first direction and the second direction to achieve image stabilization.

Images