Driving assembly, lens driving device, camera module and electronic equipment

Abstract

The invention relates to a driving assembly, a lens driving device, a camera module and electronic equipment. The focusing driving device overcomes the defects that an existing focusing driving device with an anti-shake function is short in stroke and the like. The driving assembly comprises a first magnet group, a first coil extending in the X-axis direction and a second coil extending in the X-axis direction. The first magnet group comprises an upper magnetic block, a middle magnetic block and a lower magnetic block which are overlapped in the Z-axis direction; the upper magnet and the lower magnet are magnetized in the Y-axis direction and have first magnetic pole faces facing the first coils on the same side in the Y-axis direction and first side faces formed in the Z-axis direction. The middle magnet piece is magnetized in the Z-axis direction and has second magnetic pole faces which are in contact with the first side faces. The first magnetic pole face is magnetized into the same magnetic pole as the second magnetic pole face; the second coil is disposed below the first magnetic pole face of the lower magnet and a third magnetic pole face on the opposite side of the first magnetic pole face. The lens has the advantages that the lens has the focusing performance of preventing shaking and providing large thrust and large stroke.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3C (Computer, Communication, Consumer Electronics) products, and in particular relates to a driving component, a lens driving device, a camera module and an electronic device. Background Art

[0002] It has a camera function in 3C products.

[0003] The existing camera has an anti-shake and / or focus function. In order to realize the anti-shake and / or focus function, an electromagnetic coil driving method, a piezoelectric driving method, an SMA driving method or a mechanical driving method is generally designed.

[0004] Taking the electromagnetic coil drive method as an example, the existing electromagnetic coil drive method adopts an independent group of focus drive mechanism and anti-shake drive mechanism. Of course, some inventors have designed a common magnet and realized the anti-shake focus function. For example, Chinese patent application No. 201620699830.2, a lens drive device, which includes: a housing, a base, at least one magnet, an autofocus device, an optical image stabilization device, and at least two strings; wherein the optical image stabilization device includes a mobile platform and a plurality of coils; the plurality of coils and the magnets are operatively associated with each other to push the mobile platform to perform translational motion on a plane perpendicular to the optical axis; the autofocus device includes an AF fixing bracket, an AF coil, and a lens bracket; the AF fixing bracket is fixed on the mobile platform and moves with the mobile platform; the coil and the magnet are operatively associated with each other to push the lens bracket to move along the optical axis. The lens drive device perfectly combines the autofocus device and the optical image stabilization drive device, which not only makes the lens drive device compact in structure, but also has good AF and OIS functions.

[0005] Although the above method can achieve focusing and anti-shake, the existing magnet group has a small driving stroke in the focusing direction, which makes it impossible to meet the focusing requirements of long distance and high thrust, and seriously affects the camera clarity. Summary of the invention

[0006] The object of the present invention is to provide a driving assembly, a lens driving device, a camera module and an electronic device capable of ensuring a large stroke in two directions.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The drive assembly is in an orthogonal coordinate system with mutually orthogonal X-axis, Y-axis and Z-axis. The drive components include: A first magnet group, a first coil extending along the X-axis direction, and a second coil extending along the X-axis direction; The first magnet group includes an upper magnetic block, a middle magnetic block and a lower magnetic block overlapping in the Z-axis direction; The upper magnetic block and the lower magnetic block are magnetized in the Y-axis direction respectively, and have first magnetic pole surfaces respectively opposite to the first coil on the same side in the Y-axis direction and first side surfaces formed in the Z-axis direction; The intermediate magnet sheet is magnetized in the Z-axis direction and has second magnetic pole surfaces respectively contacting the first side surfaces; The first magnetic pole face is magnetized to the same magnetic pole as the second magnetic pole face; The second coil is arranged below the first magnetic pole surface and a third magnetic pole surface of the lower magnetic block that is opposite to the first magnetic pole surface.

[0008] In the above-mentioned driving assembly, in the X-axis direction, the size of the middle magnetic block is equal to or smaller than the size of the lower magnetic block, and the size of the upper magnetic block is equal to or smaller than the size of the middle magnetic block.

[0009] In the above-mentioned driving assembly, in the Z-axis direction, the size of the lower magnetic block is larger than the size of the upper magnetic block and the size of the middle magnetic block.

[0010] In the above-mentioned driving component, the first coil is a coil with the Y-axis direction as the winding axis.

[0011] In the above-mentioned driving assembly, the first coil opposite to the upper magnetic block and the first coil opposite to the lower magnetic block are parts of two different first coils in which currents flow in opposite directions.

[0012] In the above-mentioned driving assembly, when viewed from the Y-axis direction, the first coil overlaps with two second magnetic pole surfaces of the intermediate magnetic block.

[0013] In the above-mentioned driving assembly, when viewed from the Z-axis direction, the second coil overlaps with the first magnetic pole surface and the third magnetic pole surface of the lower magnetic block.

[0014] The present application also provides a lens driving device, the lens driving device comprising the driving assembly; Provide a base for the second coil; Setting a first movable frame of the first magnet group; and A second moving frame provided with the first coil; Wherein, the second movable frame is used to install a lens, the optical axis direction of the lens is the Z-axis direction, and the second movable frame moves in the Z-axis direction relative to the first movable frame; The first movable frame moves in the Y-axis direction relative to the base.

[0015] In the above-mentioned lens driving device, the driving assembly is a pair; A pair of the driving components are sandwiched between the second moving frames and arranged along the Y-axis direction; A second magnet group is provided on the first movable frame at the X-axis side of the second movable frame, and a third coil is provided at a position of the base opposite to the second magnet group; The second magnet group is magnetized along the X-axis direction, and the third coil extends along the Y-axis direction.

[0016] In the above lens driving device, the second magnet group and the third coil form another set of driving components, and the other set of driving components is rotated 90 degrees with respect to the pair of driving components around the optical axis; The second magnet assembly includes at least one magnetic block such as the lower magnetic block rotated 90 degrees around the optical axis, and the third coil includes at least one coil such as the second coil rotated 90 degrees around the optical axis.

[0017] In the above-mentioned lens driving device, the lens driving device also includes a yoke group, which covers the surface of the first magnet group on the side not opposite to the first coil, and at least part of the surface of the lower magnetic block is not covered by the yoke group.

[0018] The present application also provides a camera module, which includes the lens driving device.

[0019] The present application also provides an electronic device, which includes the camera module.

[0020] Compared with the existing technology, the advantages of this application are: Since the first magnetic pole face is magnetized to the same magnetic pole as the second magnetic pole face, there are more magnetic fluxes that intersect with the first coil. Therefore, the stroke of the first coil and the first magnet group in the Z-axis direction can be increased. In addition, the second coil is arranged below the first magnetic pole face and the third magnetic pole face of the lower magnetic block. Therefore, the magnetic flux from the two magnetic pole faces can be utilized to increase the stroke of the second coil and the first magnet group in the Y-axis direction. Therefore, the drive component of the present invention can ensure a large stroke in two directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the driving component provided by the present invention.

[0022] Figure 2 It is a schematic diagram of the side structure of the driving assembly provided by the present invention.

[0023] Figure 3 It is a schematic diagram of the magnetic field of the driving component provided by the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the second first magnet group provided by the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the third first magnet group provided by the present invention.

[0026] Figure 6 This is a schematic diagram of the structure of the fourth first magnet group provided by the present invention.

[0027] Figure 7 It is a structural schematic diagram of Example 5 provided by the present invention.

[0028] Figure 8 It is a structural schematic diagram of Example 6 provided by the present invention.

[0029] Fig. 9 It is a structural schematic diagram of Example 7 provided by the present invention.

[0030] Fig.10 It is a schematic diagram of the structure of Example 8 provided by the present invention.

[0031] Fig.11 It is a schematic structural diagram of the drive assembly provided by the present invention after being equipped with a yoke group.

[0032] In the figure, the first magnet group 1, the upper magnetic block 11, the middle magnetic block 12, the lower magnetic block 13, the first coil 2, the second coil 3, the second magnet group 4, the third coil 5, the base 60, the FPC circuit board 600, the power supply 601, the suspension wire mounting boss 602, the suspension wire 61, the first movable frame 62, the first magnet mounting groove 620, the second magnet mounting groove 621, the spring leaf 63, the corner spring 630, the first spring leaf 63-1, the second spring leaf 63-2, the second movable frame 64, the circuit board 640, the protruding cantilever 641, the through hole 642, the sensing element 643, the shell 70, the yoke group 8, the first orientation contact portion 80, the second orientation contact portion 81, the third orientation contact portion 82, the corner portion 83, the glue storage hole 84, the exposed terminal 85, the optical axis G, the thickness h1, and the inner diameter h2. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0034] In the XYZ coordinates of this embodiment, the X axis is perpendicular to the Z axis, the Y axis is perpendicular to the Z axis, the Z axis direction is the optical axis G direction of the lens described later, and the X axis and the Y axis are perpendicular to each other. In addition, the +Z side of the Z axis is sometimes referred to as the "upper" side, and the -Z side is sometimes referred to as the "lower" side.

[0035] Example 1

[0036] like Figure 1 As shown, the drive assembly is used to drive the lens, for example, focus drive and anti-shake drive. Figure 1-Figure 3 and Fig.11 A drive system including a drive assembly is described. The drive system is used in the lens drive device described in Example 6. Specifically, Figure 1 and Figure 2 As shown, the driving assembly of this embodiment includes a first magnet group 1, a first coil 2 and a second coil 3. Figure 1 and Figure 2 A pair of drive components and another drive component formed by a second magnet group 4 and a third coil 5 are recorded in Fig.11 , a yoke group 8 is mounted with the first magnet group 1 and the second magnet group 4. The pair of drive units are symmetrically arranged in the Y-axis direction around the optical axis G of the lens. The second magnet group 4 and the third coil 5 are arranged on the +X side of the optical axis G.

[0037] Furthermore, if Figure 2 and Figure 3 As shown, the first magnet group 1 of this embodiment is composed of an upper magnetic block 11, a middle magnetic block 12 and a lower magnetic block 13 from top to bottom and overlap in the Z-axis direction. The upper magnetic block 11, the middle magnetic block 12 and the lower magnetic block 13 are respectively formed into a rectangular parallelepiped shape extending along the X-axis direction. The size of the upper magnetic block 11 in the X-axis direction is smaller than the size of the middle magnetic block 12 in the X-axis direction, and the size of the middle magnetic block 12 in the X-axis direction is smaller than the size of the lower magnetic block 13 in the X-axis direction. The upper magnetic block 11 and the lower magnetic block 13 are magnetized in the Y-axis direction, respectively, and have a first magnetic pole face opposite to the first coil 2 on the same side of the Y-axis direction, a third magnetic pole face on the opposite side of the first magnetic pole face, and a first side face formed in the Z-axis direction.

[0038] exist Figure 1 and Figure 2 In the driving assembly on the -Y side of the figure, the first coil 2 is located on the +Y side of the first magnet group 1, the first pole surface of the upper magnetic block 11 is magnetized to the S pole, the third pole surface is magnetized to the N pole, the first pole surface of the lower magnetic block 13 is magnetized to the N pole, and the third pole surface is magnetized to the S pole. In the driving assembly on the +Y side of the figure, the first coil 2 is located on the -Y side of the first magnet group 1, the first pole surface of the upper magnetic block 11 is magnetized to the S pole, the third pole surface is magnetized to the N pole, the first pole surface of the lower magnetic block 13 is magnetized to the N pole, and the third pole surface is magnetized to the S pole.

[0039] The middle magnetic block 12 is magnetized in the Z-axis direction and has an upper second magnetic pole surface and a lower second magnetic pole surface. The upper second magnetic pole surface of any of the two middle magnetic blocks 12 is an S pole, which contacts the first side surface of the upper magnetic block 11. The lower second magnetic pole surface of any of the two middle magnetic blocks 12 is an N pole, which contacts the first side surface of the lower magnetic block 13.

[0040] Therefore, if Figure 3 As shown, the magnetic flux on the first magnetic pole face increases, and the magnetic flux on the third magnetic pole face decreases. That is, since the first magnetic pole face of the upper magnetic block 11 and the first magnetic pole face of the lower magnetic block 13 both have the same magnetic pole as the second magnetic pole face of the middle magnetic block 12, the magnetic flux of the second magnetic pole face also appears on the first magnetic pole face, so the magnetic flux of the first magnetic pole face increases. On the contrary, since the magnetic flux of the third magnetic pole face and the magnetic flux of the second magnetic pole face cancel each other out, the magnetic flux of the third magnetic pole face decreases. In addition, the increased magnetic flux also leaks from a position close to the first magnetic flux face of the middle magnetic block 12.

[0041] In addition, if Figure 3 As shown, the magnetic flux of the upper half of the upper magnetic block 11 and the magnetic flux of the lower half of the lower magnetic block 13 form a loop between the first magnetic pole surface and the third magnetic pole surface outside the first magnet group 1.

[0042] like Figure 1 and Figure 2 As shown, first coils 2 are spaced apart inside each group of first magnet groups 1. The first coil 2 is a hollow coil with the Y-axis direction as the winding axis direction. Two straight portions extend along the X-axis direction, and one side is opposite to the upper magnetic block 11, and the other side is opposite to the lower magnetic block 13. The surfaces of the upper magnetic block 11 and the lower magnetic block 13 that are opposite to the first coil 2 are first magnetic pole surfaces. Second coils 3 are spaced apart below each group of first magnet groups 1. The second coil 3 is a hollow coil with the Z-axis direction as the winding axis direction. Two straight portions extend along the X-axis direction, and when viewed from the Z-axis direction, one side of the two straight portions overlaps with the first magnetic pole surface of the lower magnetic block 13, and the other side overlaps with the third magnetic pole surface.

[0043] like Figure 1 As shown, the thickness h1 of the middle magnetic block 12 in the direction of the optical axis G is smaller than the inner diameter h2 of the first coil 2 in the direction of the optical axis G, that is, when viewed from the Y-axis direction, the first coil 2 overlaps with the two second magnetic pole surfaces of the middle magnetic block 12. This design can prevent the middle magnetic block 12 from interfering with the focusing magnetic field when the first coil 2 cooperates with the upper magnetic block 11 and the lower magnetic block 13, and can utilize the leakage magnetic flux of the middle magnetic block 12.

[0044] In order to take into account both anti-shake and focusing, the size of the lower magnetic block 13 in the first magnet group 1 closest to the second coil 3 in the Z-axis direction is larger than the size of the upper magnetic block 11 and the size of the middle magnetic block 12, and the size of the upper magnetic block 11 and the size of the middle magnetic block 12 are the same or different. In this way, the magnetic flux crossing the second coil 3 can be increased. This structural design can make the anti-shake movement stroke reach the set movement stroke.

[0045] Secondly, another driving component of this embodiment includes at least one second magnet group 4 and at least one third coil 5, and the third coil 5 is arranged at intervals on the lower side of the second magnet group 4. The second magnet group 4 has a substantially rectangular parallelepiped shape that is longer in the Y-axis direction and is magnetized in the X-axis direction. The third coil 5 is a hollow coil with the Z-axis direction as the winding axis direction, and two straight portions extend along the Y-axis direction.

[0046] The working principle of this embodiment is as follows: When the first coil 2 is energized, an electromagnetic force in the Z-axis direction is generated between the first magnet group 1. When the second coil 3 is energized, an electromagnetic force in the Y-axis direction is generated between the first magnet group 1. Thus, the drive component of this embodiment can generate driving forces in two directions, the Z-axis direction and the Y-axis direction. Moreover, since the first magnetic pole face is magnetized to the same magnetic pole as the second magnetic pole face, there are more magnetic fluxes that cross the first coil 2. Therefore, the stroke of the first coil 2 and the first magnet group 1 in the Z-axis direction can be increased. In addition, the second coil 3 is arranged below the first magnetic pole face and the third magnetic pole face of the lower magnetic block 13. Therefore, the magnetic flux from the two magnetic pole faces can be used to increase the stroke of the second coil 3 and the first magnet group 1 in the Y-axis direction. Therefore, the drive component of this embodiment can ensure a large stroke in two directions.

[0047] Furthermore, in the present embodiment, when the third coil 5 is energized, an electromagnetic force in the X-axis direction is generated between the third coil 5 and the second magnet group 4 , and this electromagnetic force serves as a driving force in the X-axis direction.

[0048] Focusing: The first magnet group 1 cooperates with the first coil 2 to generate a first driving force distributed along the optical axis G direction (Z axis direction); Anti-shake: The first magnet group 1 cooperates with the second coil 3 to generate a second driving force distributed along the Y-axis direction, and the third coil 5 cooperates with the second magnet group 4 to generate a third driving force distributed along the X-axis direction.

[0049] like Fig.11As shown, the lens driving device also includes a yoke group 8, and the yoke group 8 has a first azimuth contact portion 80 that contacts the outer side surface of the first magnet group 1. The first azimuth contact portion 80 of the yoke group 8 covers the surface of the first magnet group 1 on the side that is not opposite to the first coil 2, but does not cover at least the lower part of the surface in the lower magnetic block 13. Therefore, the yoke group 8 can reduce the magnetic leakage outside the first magnet group 1. At the same time, the yoke group 8 is made of a metal magnetic material, which can also form a magnetization for the first magnet group 1 to increase the focus driving force and driving stroke. In addition, since at least the lower part of the third magnetic pole surface of the lower magnetic block 13 is not covered, the magnetic flux crossing the second coil 3 will not be reduced.

[0050] The yoke group 8 also has a second azimuth contact portion 81 in contact with the outer side surface of the second magnet group 4 and / or a third azimuth contact portion 82 in contact with the upper top surface of the second magnet group 4. The yoke group 8 can reduce the magnetic leakage of the outer side surface and / or the upper top surface of the second magnet group 4. At the same time, it can also form magnetization for the second magnet group 4 to increase the anti-shake driving force and driving stroke. In addition, like the first azimuth contact portion 80, since the second azimuth contact portion 81 does not cover at least the lower part of the outer side surface of the second magnet group 4, the magnetic flux crossing the third coil 5 will not be reduced.

[0051] The first azimuth contact portion 80 is connected to the second azimuth contact portion 81 or the third azimuth contact portion 82 through the corner portion 83 to improve the structural strength of the yoke group 8, and at the same time, it can also facilitate modular manufacturing and improve the processing efficiency of the subsequent process. Preferably, a glue storage hole 84 is provided on the first azimuth contact portion 80, the second azimuth contact portion 81 and the third azimuth contact portion 82, respectively, to improve the connection firmness between the yoke group 8 and the first magnet group 1, and to improve the connection firmness between the yoke group 8 and the second magnet group 4.

[0052] Example 2

[0053] The structure and working principle of this embodiment are basically the same as those of embodiment 1, except that: Figure 4 As shown, the upper magnetic block 11, the middle magnetic block 12 and the lower magnetic block 13 have the same size in the X-axis direction. The two end surfaces of the three magnetic blocks 11-13 in the corresponding X-axis direction are flush with each other to further improve the focus driving performance.

[0054] Example 3

[0055] The structure and working principle of this embodiment are basically the same as those of embodiment 1, except that: Figure 1 As shown, in the X-axis direction, the size of the middle magnetic block 12 is smaller than that of the lower magnetic block 13, and the size of the upper magnetic block 11 is smaller than that of the middle magnetic block 12. This design can reduce the overall weight of the first magnetic block 10 to the greatest extent, while meeting the focus and anti-shake driving requirements.

[0056] like Figure 5 As shown, in the X-axis direction, the size of the upper magnetic block 11 is smaller than the size of the middle magnetic block 12 , and the size of the middle magnetic block 12 is equal to the size of the lower magnetic block 13 .

[0057] like Figure 6 As shown, in the X-axis direction, the size of the upper magnetic block 11 is equal to the size of the middle magnetic block 12 , and the size of the middle magnetic block 12 is smaller than the size of the lower magnetic block 13 .

[0058] Example 4

[0059] The structure and working principle of this embodiment are basically the same as those of Embodiment 1, and the difference lies in that in the Z-axis direction, the sizes of the upper magnetic block 11, the middle magnetic block 12 and the lower magnetic block 13 in this embodiment are equal.

[0060] Example 5

[0061] The structure and working principle of this embodiment are basically the same as those of embodiment 1, except that: Figure 7 As shown, the first magnet group 1 of this embodiment has a structure in which a second intermediate magnet block is disposed on the upper side of the upper magnet block 11 and a second upper magnet block is disposed on the upper side thereof. Since three first coils 2 can be arranged, a greater driving force can be obtained.

[0062] Example 6

[0063] like Figure 1 , Figure 8 and Fig.11 As shown, this embodiment provides a lens driving device, which includes a pair of driving components of any one of embodiments 1 to 5. The lens driving device also includes a base 60, a first movable frame 62, a second movable frame 64, a suspension wire 61, a reed 63, a second magnet group 4 and a third coil 5. The lens is mounted on the second movable frame 64 in such a way that the Z-axis direction becomes the axial direction of the optical axis G. Light from the subject is incident on the lens from the upper side, i.e., the +Z side, passes through the lens, and is emitted from the lens on the lower side, i.e., the -Z side, and is incident on an image sensor not shown in the figure that is arranged on the lower side of the lens.

[0064] Secondly, the lens driving device also includes a base 60, which is connected to a first moving frame 62 through a suspension line 61. The first moving frame 62 has a yoke group 8. When the first moving frame 62 is injection molded, the yoke group 8 is embedded, which improves production efficiency. The first moving frame 62 is connected to a second moving frame 64 through a spring 63. The first magnet group 1 and the second magnet group 4 of the driving component are installed on the first moving frame 62, the first coil 2 is installed on the second moving frame 64, and the second coil 3 and the third coil 5 are installed on the base 60.

[0065] A pair of driving components are arranged along the Y-axis direction with the second moving frame 64 sandwiched therebetween. In addition, the second magnet group 4 is magnetized in the X-axis direction and arranged at a position on the +X side of the optical axis G, and the third coil 5 is arranged in a position opposite to the second magnet group 4 in the Z-axis direction and extends in the Y-axis direction. Thus, when current flows through the second coil 3, the first moving frame 62 moves in the Y-axis direction relative to the base 60, when current flows through the third coil 5, the first moving frame 62 moves in the X-axis direction relative to the base 60, and when current flows through the first coil 2, the second moving frame 64 moves in the Z-axis direction, that is, the axial direction of the optical axis G, relative to the first moving frame 62.

[0066] like Figure 8 and Fig.11 As shown, an FPC circuit board 600 is provided on the base 60, and the second coil 3 and the third coil 5 of the driving component are embedded in the FPC circuit board 600. A power supply 601 electrically connected to the FPC circuit board 600 is provided on the base 60, and the power supply 601 is an embedded metal part embedded in the base 60. The power supply 601 has exposed terminals exposed on the outer peripheral surface of the base 60, and there are four suspension wires 61, at least one suspension wire 61 is electrically connected to the power supply 601. When the power supply 601 is energized, the second coil 3 and the third coil 5 are also energized, and at this time, the anti-shake driving movement of the first moving frame 62 can be realized.

[0067] A first magnet mounting groove 620 is provided on the inner wall of the first movable frame 62 for mounting two groups of first magnet groups 1 included in the driving assembly one by one, the first orientation contact portion 80 of the yoke group 8 is exposed in the first magnet mounting groove 620, the outer side surface of the first magnet group 1 contacts the inner surface of the first orientation contact portion 80, and a second magnet mounting groove 621 is provided for mounting the second magnet group 4, the second orientation contact portion 81 and the third orientation contact portion 82 of the yoke group 8 are exposed in the second magnet mounting groove 621, in order to make the magnet group stable, glue can be applied in the first magnet mounting groove 620 and the second magnet mounting groove 621, the glue is bonded to the corresponding magnet groups, so that the magnet groups are fixed more stably.

[0068] The yoke assembly 8 can further strengthen the structural strength of the first movable frame 62 .

[0069] Two groups of first magnet groups 1 and one group of second magnet groups 4 are distributed in a U shape, and the two first coils 2 of the driving component are respectively fixed to the outer surfaces on both sides opposite to each other in the Y-axis direction of the second movable frame 64. The spring leaf 63 has two pieces, such as a first spring leaf 63-1 and a second spring leaf 63-2. The first spring leaf 63-1 is fixed to the upper end surfaces of the second movable frame 64 and the first movable frame 62, and the second spring leaf 63-2 is fixed to the lower end surfaces of the second movable frame 64 and the first movable frame 62. The first spring leaf 63-1 has a corner spring 630 connected to the above-mentioned suspension wire 61. At this time, the suspension wire 61 supplies power to the first spring leaf 63-1 after being energized, and the first spring leaf 63-1 can supply power to the two first coils 2.

[0070] Of course, there is another way: a circuit board 640 electrically connected to the first leaf spring 63-1 is provided on the second movable frame 64. The circuit board 640 is a flexible circuit board or a hard circuit board. The circuit board 640 is electrically connected to the two first coils 2 mentioned above. At this time, the first coil 2 and the first magnet group 1 cooperate to generate a first driving force distributed along the direction of the optical axis G.

[0071] There is another solution: the yoke group 8 in this embodiment can also be used for conductive purposes. For example, the first orientation contact portion 80 has an exposed terminal 85 exposed outside the first movable frame 62. The yoke group 8 is electrically connected to one of the spring leaves 63, so that power can be supplied to the first coil 2.

[0072] An outer circumferential surface of the second movable frame 64 is provided with an outer protruding cantilever 641, and the circuit board 640 is fixed on the outer protruding cantilever 641. The outer protruding cantilever 641 is in a plate-like or block-like shape. A through hole 642 arranged along the direction of the optical axis G is provided on the outer protruding cantilever 641, and a sensing element 643 extending into the through hole 642 is provided on the circuit board 640. The sensing element 643 and the measured object on the FPC circuit board 600 or the base 60 (not shown in the figure) are spaced apart in the direction of the optical axis G. The sensing element 643 is, for example, a Hall sensor, and the measured object is, for example, a magnetic block, etc. The cooperation between the sensing element 643 and the measured object can detect the axial movement position of the second movable frame 64 along the optical axis G to ensure the controllability of the focus.

[0073] The base 60 is buckled with a housing 70 , and the first movable frame 62 and the second movable frame 64 are placed in an internal cavity formed by the base 60 and the housing 70 .

[0074] Suspension wire mounting bosses 602 are respectively provided at the four corners of the base 60, and four suspension wires 61 are respectively fixed on the corresponding suspension wire mounting bosses 602.

[0075] Example 7

[0076] like Fig. 9As shown, based on Example 6, this embodiment further provides a camera module, and the camera module includes the lens driving device of Example 6. The camera module may also include a lens group arranged in the lens driving device.

[0077] Example 8

[0078] like Fig.10 As shown, the electronic device of this embodiment includes the camera module of Embodiment 7. The electronic device is, for example, a 3C product, such as a mobile phone, a computer, and other digital products.

[0079] In addition, the first coil 2 may also be an air-core coil with the Z-axis direction as the winding axis. For example, in Embodiment 6, two such first coils 2 may also be provided around the entire periphery of the second moving frame 64, and the same structure may be applied to the drive components of Embodiments 1 and 5.

[0080] In addition, in Example 6, another pair of drive components is also included. The other pair of drive components is rotated 90 degrees around the optical axis G with respect to the pair of drive components described in Example 6. The other pair of drive components includes a second magnet group 4 and a third coil 5 and serves as the lower magnetic block 13 and the second coil 3 respectively, that is, the second magnet group 4 includes a magnetic block such as the lower magnetic block 13 rotated 90 degrees around the optical axis, and the third coil 5 includes a coil such as the second coil 3 rotated 90 degrees around the optical axis. In addition, the first coil 2 with the Z-axis direction as the winding axis described in the previous paragraph can also be used.

[0081] In Example 6, the movable part is supported relative to the fixed part using the suspension wire 61 method and the spring 63 method, but different supporting methods such as the ball and groove method, the protrusion and groove method, and the rail and groove method and their combinations may also be used.

[0082] In addition, in Example 6, a lens driving device is described, but it can be applied to a driving device of an image sensor or a driving device of other optical components using the driving components of Examples 1 to 5.

[0083] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A drive assembly having an orthogonal coordinate system with mutually orthogonal X-axis, Y-axis and Z-axis, characterized in that: The drive assembly comprises: A first magnet group (1), a first coil (2) extending in the X-axis direction, and a second coil (3) extending in the X-axis direction; The first magnet group (1) comprises an upper magnetic block (11), a middle magnetic block (12) and a lower magnetic block (13) which overlap in the Z-axis direction; The upper magnetic block (11) and the lower magnetic block (13) are respectively magnetized in the Y-axis direction, and have first magnetic pole surfaces respectively opposite to the first coil (2) on the same side in the Y-axis direction and first side surfaces formed in the Z-axis direction; The intermediate magnetic sheet (12) is magnetized in the Z-axis direction and has second magnetic pole surfaces respectively contacting the first side surfaces; The first magnetic pole face is magnetized to the same magnetic pole as the second magnetic pole face; The second coil (3) is arranged below the first magnetic pole surface of the lower magnetic block (13) and a third magnetic pole surface on the opposite side of the first magnetic pole surface.

2. The drive assembly according to claim 1, characterized in that: In the X-axis direction, the size of the middle magnetic block (12) is equal to or smaller than the size of the lower magnetic block (13), and the size of the upper magnetic block (11) is equal to or smaller than the size of the middle magnetic block (12).

3. The drive assembly according to claim 1, characterized in that: In the Z-axis direction, the size of the lower magnetic block (13) is larger than the size of the upper magnetic block (11) and the size of the middle magnetic block (12).

4. The drive assembly according to claim 1, characterized in that: The first coil (2) is a coil with the Y-axis direction as the winding axis.

5. The drive assembly according to claim 1, characterized in that: The first coil (2) opposite to the upper magnetic block (11) and the first coil (2) opposite to the lower magnetic block (13) are parts of two different first coils (2) in which currents flow in opposite directions.

6. The drive assembly according to claim 1, characterized in that: When viewed from the Y-axis direction, the first coil (2) overlaps with two second magnetic pole surfaces of the intermediate magnetic block (12).

7. The drive assembly according to claim 1, characterized in that: When viewed from the Z-axis direction, the second coil (3) overlaps with the first magnetic pole surface and the third magnetic pole surface of the lower magnetic block (13).

8. A lens driving device, characterized in that: The lens driving device comprises: The drive assembly according to any one of claims 1 to 7; A base (60) is provided for the second coil (3); A first movable frame (62) is provided for the first magnet group (1); as well as A second moving frame (64) provided with the first coil (2); The second movable frame (64) is used to mount a lens, the optical axis direction of the lens is the Z-axis direction, and the second movable frame (64) moves in the Z-axis direction relative to the first movable frame (62); The first movable frame (62) moves in the Y-axis direction relative to the base (60).

9. The lens driving device according to claim 8, characterized in that: The driving components are a pair; A pair of the driving components are sandwiched between the second moving frames (64) and are arranged along the Y-axis direction; In addition, a second magnet group (4) is provided on the first movable frame (62) on the X-axis side of the second movable frame (64), and a third coil (5) is provided on the base (60) at a position opposite to the second magnet group (4); The second magnet group (4) is magnetized along the X-axis direction, and the third coil (5) extends along the Y-axis direction.

10. The lens driving device according to claim 9, characterized in that: The second magnet group (4) and the third coil (5) form another group of drive components, and the other group of drive components is rotated 90 degrees with respect to the pair of drive components with the optical axis as the center; The second magnet assembly (4) comprises at least one magnetic block such as the lower magnetic block (13) rotated 90 degrees around the optical axis, and the third coil (5) comprises at least one coil such as the second coil (3) rotated 90 degrees around the optical axis.

11. The lens driving device according to claim 8, characterized in that: The lens driving device further comprises a yoke group (8), wherein the yoke group (8) covers a surface of the first magnet group (1) on a side not opposite to the first coil (2), and at least a portion of the surface of the lower magnetic block (13) is not covered by the yoke group (8).

12. A camera module, characterized in that: The camera module includes the lens driving device described in any one of claims 8-11.

13. An electronic device, characterized in that The electronic device includes the camera module described in claim 12.

Images