Thin optical anti-vibration motor, camera module and electronic equipment

Abstract

The invention relates to a thin optical anti-vibration motor, a camera module and electronic equipment. The thin optical anti-vibration motor comprises a shell assembly, a focusing module and an anti-vibration module, the focusing module comprises a focusing carrier, a focusing coil and a focusing magnet group; the focusing magnet group comprises at least three focusing magnets arranged in a Halbach array; the anti-shake module comprises an anti-shake carrier and an anti-shake driving assembly, wherein the anti-shake carrier is movably connected with the focusing carrier through supporting balls arranged in a single layer, and the anti-shake driving assembly comprises an X-axis driving unit, a Y-axis driving unit and a displacement detection assembly. The displacement detection assembly comprises two Hall integrated circuits. According to the anti-shake module, the supporting balls which are arranged in a single-layer mode are adopted as connecting media, the overall height of the motor is reduced, the motor has more advantages in space utilization, the motor can better adapt to equipment with strict space size requirements, meanwhile, the assembling procedures and the number of needed components are reduced, the production cost is reduced, and the market competitiveness is improved.

Description

Technical Field

[0001] The present invention relates to the field of lens motors, and more specifically, to a thin optical image stabilization motor, a camera module and an electronic device. Background Art

[0002] In today's era of rapid technological development, the market has put forward more stringent requirements for camera module motors. It is not only necessary to have a three-axis closed-loop function to achieve precise motion control, but also urgently needs to achieve a thin design to meet the ever-increasing integration needs of various thin and light electronic devices. Traditional ball motors mostly use a double-layer ball structure. In this structure, each layer of balls is provided with a guide groove, and the guide grooves of the two layers of balls are arranged orthogonally. This carefully designed structure can indeed effectively avoid the crosstalk phenomenon between the X and Y axes, thereby providing a reliable guarantee for the anti-shake effect. However, this traditional architecture also inevitably has some limitations. On the one hand, due to its relatively complex structure, it involves more parts and delicate assembly processes, resulting in high production costs. On the other hand, the double-layer ball structure itself occupies a certain space height, which undoubtedly brings huge challenges to the thin design of the motor, and it is difficult to adapt to the latest market demand for thin and light products. Summary of the invention

[0003] In view of this, the present invention provides a thin optical image stabilization motor, in which the image stabilization module uses support balls arranged in a single layer as a connection medium, so that the image stabilization carrier is movably connected to the focus carrier through the support balls. Compared with the previous double-layer ball structure, this design reduces the overall height of the motor, has more advantages in space utilization, can better adapt to equipment with strict space size requirements, and at the same time reduces the assembly process and the number of required parts, reduces production costs, and improves market competitiveness.

[0004] The purpose of the present invention is achieved through the following technical solutions: A thin optical anti-shake motor comprises a housing component, a focus module and an anti-shake module.

[0005] The housing assembly has a containing cavity extending along the optical axis direction Z axis.

[0006] The focusing module includes a focusing carrier and a focusing drive unit movably arranged in a containing cavity, wherein the focusing drive unit includes a focusing coil and a focusing magnet group; the focusing magnet group includes at least three focusing magnets arranged in a Halbach array, and the magnetic field enhancement direction of the focusing magnets arranged in the Halbach array is toward the focusing coil.

[0007] The anti-shake module includes an anti-shake carrier movably connected to the focus carrier through at least three support balls arranged in a single layer, and an anti-shake drive component, wherein the anti-shake drive component includes an X-axis drive unit, a Y-axis drive unit and a displacement detection component. The X-axis drive unit has an X-axis magnet group and a corresponding X-axis coil arranged on the first side of the anti-shake carrier, and the first side is orthogonal to the X-axis direction. The Y-axis drive unit has two groups of Y-axis magnet groups and two corresponding groups of Y-axis coils symmetrically arranged on the second side of the anti-shake carrier; the second side is orthogonal to the Y-axis direction. The displacement detection component includes two Hall integrated circuits respectively arranged corresponding to the two groups of Y-axis magnet groups, and the Hall integrated circuit maintains a detection distance with the corresponding Y-axis magnet group.

[0008] The anti-shake module uses a single-layer support ball as a connection medium, so that the anti-shake carrier is movably connected to the focus carrier through the support ball. Compared with the previous double-layer ball structure, this design reduces the overall height of the motor, has more advantages in space utilization, and can better adapt to equipment with strict space requirements. At the same time, it reduces the assembly process and the number of required parts, reduces production costs, and improves market competitiveness.

[0009] However, the single-layer ball bearing structure has no guide grooves, so it is easy to have X-axis and Y-axis crosstalk during actual operation, which affects the anti-shake performance and causes unstable and blurred shooting images. To solve this problem, the R&D team added an electromagnetic structure for rotation compensation, using two sets of Y-axis power and linkage displacement detection components in the Y-axis direction to construct an innovative electromagnetic design with dual coils, dual magnets and dual ICs. The dual ICs are two Hall integrated circuits that can accurately measure the relative distance to the Y-axis magnet group. After detecting the distance difference, the system can quickly calculate the rotation angle of the anti-shake carrier, and compensate for the rotation angle of the anti-shake carrier by accurately adjusting the current of the two Y-axis coils, effectively improving the crosstalk problem between the X and Y axes, ensuring that the anti-shake module operates stably and efficiently, and providing stable and clear picture support for shooting.

[0010] In the focusing module, the focusing magnets arranged in a Halbach array have the advantages of enhancing the magnetic field strength in a specific direction, weakening the magnetic field on the other side, optimizing the uniformity of the magnetic field distribution, and improving the utilization rate of the magnetic field.

[0011] Enhance the magnetic field strength in a specific direction: By arranging the focusing magnets with different magnetization directions according to the specific rules of the Halbach array, the magnetic lines of force can be gathered on one side of the magnet (i.e., in the direction toward the focusing coil), so that the magnetic field strength on that side is significantly enhanced. With the same amount of magnets used, the surface magnetic field strength of the focusing magnet group arranged in the Halbach array in the enhanced direction is significantly improved compared to the traditional single focusing magnet. This enhanced magnetic field acts on the focusing coil, which can effectively improve the focusing driving force. The stronger focusing driving force makes the focus carrier move faster and more powerfully in the accommodating cavity, thereby significantly improving the focusing speed, reducing the time required for focusing, and meeting the user's demand for fast imaging. At the same time, it can also improve the accuracy of focusing, make the imaging clearer and sharper, reduce the image blur caused by inaccurate focusing, and optimize the focusing performance.

[0012] Weaken the magnetic field on the other side: This arrangement will strengthen the magnetic field on one side of the focus coil while weakening the magnetic field on the other side, and even make the magnetic field on that side close to zero, thus obtaining a relatively ideal unilateral magnetic field. This feature can avoid interference with surrounding sensitive electronic components, achieve a self-shielding effect in the non-working area, ensure the normal operation of other electronic components in the entire optical image stabilization motor system, and improve the stability and reliability of the system.

[0013] Optimize the uniformity of magnetic field distribution: The focusing magnets arranged in the Halbach array make the magnetic field distribution relatively uniform. During the focusing process, the uniform magnetic field helps the focusing carrier move smoothly and accurately, providing a good magnetic field environment for obtaining high-resolution image information. The uniformity of the magnetic field can reduce errors and fluctuations during the focusing process, further improve the stability and accuracy of the focus, and help to shoot high-quality images and videos.

[0014] Improve magnetic field utilization: This arrangement reduces magnetic leakage and can achieve a stronger magnetic field effect with fewer magnets. This not only reduces the demand for magnetic materials and saves production costs, but also reduces the overall weight of the entire focus module and even the thin optical image stabilization motor. It is suitable for equipment application scenarios with weight and space restrictions, and improves the flexibility and adaptability of the product in design and application.

[0015] Achieve high thrust: This special arrangement can greatly increase the magnetic thrust. Compared with ordinary magnets, the focus magnets arranged in the Halbach array can generate greater force, pushing the focus carrier to achieve fast and accurate focusing action, achieving a high thrust effect, meeting the needs of some application scenarios with high requirements for focusing performance and requiring fast and powerful focusing drive, and helping to achieve large-scale and high-performance development of products.

[0016] Preferably, the focusing module is provided with a composite guide assembly, including at least one group of ball guide mechanisms distributed along the optical axis direction and at least one group of roller guide mechanisms; the ball guide mechanism includes a guide groove formed on the inner wall of the shell and at least one guide ball embedded in the side wall of the focusing carrier, and the roller guide mechanism includes a limit groove formed on the inner wall of the shell and at least one guide roller embedded in the side wall of the focusing carrier.

[0017] The configuration of the composite guide assembly provides multi-dimensional, high-precision guide constraints for the movement of the focus carrier in the accommodating cavity. The ball guide mechanism, with the small contact area between the guide ball and the guide groove, can keenly sense and adapt to the slight deviation of the focus carrier during movement, effectively reduce the jamming caused by friction and assembly errors, and ensure that the focus carrier moves smoothly and fluently along the optical axis. At the same time, the roller guide mechanism, with the help of the cooperation between the guide roller and the limit groove, provides a larger support area and stronger load-bearing capacity, significantly enhancing the stability of the focus carrier during movement, so that it can still maintain a precise motion trajectory when subjected to large external forces or in high-speed movement. It greatly improves the overall reliability and focusing accuracy of the focus module, increases stability during movement, and effectively suppresses the occurrence of tipping.

[0018] Preferably, the guide ball of the ball guide mechanism forms a point contact rolling fit with the guide groove, and the guide roller of the roller guide mechanism forms a line contact rolling fit with the limiting groove.

[0019] This matching method has significant advantages. The point contact rolling matching reduces the stress concentration effect at the contact point when the guide ball rolls in the guide groove, which can effectively reduce wear and extend the service life of the ball and the guide groove. At the same time, the point contact method also gives the focus carrier a certain flexibility during movement, enabling it to better respond to the instructions of the focus drive unit and achieve fast and accurate focusing actions. The line contact rolling matching increases the friction and restraint between the guide roller and the limit groove by increasing the contact area, providing more stable support and guidance for the focus carrier, further suppressing the shaking and deviation of the focus carrier during movement, and ensuring the stability and accuracy of the focusing process.

[0020] Preferably, it also includes a clamping piece that is snap-connected to the side wall of the focusing carrier, and the clamping piece is bonded to the top of the anti-shake carrier through a damping adhesive layer.

[0021] It can significantly improve the dynamic characteristics of the anti-shake carrier in the X-axis and Y-axis directions. In actual work, the anti-shake carrier needs to perform precise and stable movements in the X-axis and Y-axis directions to achieve an effective anti-shake function. The connection method between the clamping part and the focusing carrier and the anti-shake carrier can, while ensuring the movement flexibility of the anti-shake carrier, effectively suppress unstable phenomena such as vibration and晃动 during the movement of the anti-shake carrier in the X-axis and Y-axis directions through the buffering effect of the damping glue layer and the stable support of the snap connection, making the movement of the anti-shake carrier in these two directions smoother and more accurate, thereby enhancing the performance of the entire optical image stabilization motor in terms of the anti-shake function and providing a strong guarantee for obtaining high-quality imaging effects.

[0022] The clamping part and the side wall of the focusing carrier are closely配合 by mechanical snaps, which can ensure that a firm and reliable connection state is maintained between the focusing carrier and the clamping part under various operating conditions of the instrument, providing a stable and reliable basic structural support for the entire optical image stabilization motor system. The clamping part and the top of the anti-shake carrier are bonded through a damping glue layer, and the damping glue layer plays a buffering role here. During the focusing and anti-shake processes, the system will inevitably generate various vibrations and impact forces. If these energies are directly transmitted to the entire optical image stabilization motor structure, it may cause damage to the internal precision components and affect the stability and reliability of the system. The damping glue layer has good viscoelasticity and energy dissipation characteristics and can quickly and effectively absorb and dissipate these vibration and impact energies. Specifically, when vibrations or impact forces are transmitted to the damping glue layer, the internal polymer materials will undergo changes in the microscopic structure, converting mechanical energy into heat energy and dissipating it, thereby greatly reducing the vibrations and impact forces transmitted to other components of the optical image stabilization motor, and thus improving the stability and reliability of the entire system.

[0023] Preferably, the guide groove is V-shaped, and its cross-section is a symmetric double-inclined plane structure.

[0024] The symmetric double-inclined plane structure can provide good positioning and constraint for the guide balls. No matter how the focusing carrier moves in the optical axis direction, the guide balls can automatically stay in the appropriate position under the action of the V-shaped groove, ensuring that the movement direction of the focusing carrier is always consistent with the optical axis direction. At the same time, the structure of the V-shaped groove also has a certain self-centering function. During the assembly process, even if there are certain deviations, the guide balls can automatically adjust their positions under the guidance of the V-shaped groove, reducing the assembly difficulty, improving the assembly accuracy, and thus enhancing the performance stability of the entire focusing module.

[0025] Preferably, the limit groove is U-shaped, and its cross-section is a匚-shaped structure.

[0026] The design of the U-shaped limit groove provides reliable limit and support for the guide roller. The U-shaped structure can effectively limit the displacement of the guide roller in the horizontal and vertical directions, prevent the guide roller from falling off or shifting during movement, and ensure the stability and reliability of the roller guide mechanism. In addition, the structure of the U-shaped limit groove is easy to process and manufacture, which can reduce production costs, improve production efficiency, and is also conducive to subsequent maintenance and repair work.

[0027] Preferably, the guide roller is cylindrical.

[0028] The cylindrical guide roller has the advantages of regular shape and easy processing and manufacturing. The standard cylindrical shape can ensure the uniformity and stability of the guide roller when rolling in the limit groove, reduce the change of rolling resistance caused by shape deviation, and make the movement of the focus carrier more stable and smooth. At the same time, the cylindrical guide roller is easier to cooperate with the limit groove during the assembly process, which reduces the difficulty of assembly, improves the assembly efficiency, and is conducive to ensuring the quality and consistency of the product.

[0029] Preferably, the ball guide mechanism contains three guide balls.

[0030] The design of three guide balls achieves an optimized balance between structure and performance while ensuring guiding accuracy, effectively dispersing the force borne by the focusing carrier during movement, reducing the force burden of a single ball, reducing the risk of wear, and extending the service life of the ball.

[0031] Preferably, the focusing magnet group, the ball guide mechanism and the roller guide mechanism are all arranged on a third side of the focusing carrier, and the third side is orthogonal to the X-axis direction or to the Y-axis direction.

[0032] Arranging the focusing magnet group, the ball guide mechanism and the roller guide mechanism on the same side of the focusing carrier helps to achieve a compact structure and a reasonable layout.

[0033] Preferably, the focusing magnet group is arranged on a third side of the focusing carrier, and the ball guide mechanism and the roller guide mechanism are arranged on a fourth side of the focusing carrier.

[0034] The focusing magnet group is arranged on the third side, and the ball guide mechanism and the roller guide mechanism are arranged on the fourth side, thereby avoiding possible mutual interference between the components.

[0035] Preferably, a lower ball groove is provided on the upper surface of the focusing carrier, a corresponding upper ball groove is provided on the lower surface of the anti-shake carrier, and the supporting ball is clamped between the lower ball groove and the upper ball groove.

[0036] By respectively arranging corresponding ball grooves on the focus carrier and the anti-shake carrier and clamping the supporting balls therein, it is achieved that the focus carrier and the anti-shake carrier are flexibly and stably connected through the supporting balls arranged in a single layer.

[0037] Another implementation of the present invention is a camera module, comprising the thin optical image stabilization motor as described above.

[0038] Another implementation of the present invention is an electronic device, comprising a device housing and the camera module as described above, wherein the camera module is disposed in the device housing.

[0039] The beneficial effects of the present invention compared with the prior art are: The thin optical image stabilization motor of the present invention uses a single-layer support ball as the connection medium in the image stabilization module, so that the image stabilization carrier is movably connected to the focus carrier through the support ball. Compared with the previous double-layer ball structure, this design reduces the overall height of the motor, has more advantages in space utilization, can better adapt to equipment with strict space size requirements, and reduces the assembly process and the number of required parts, reducing production costs and improving market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 FIG. 1 is an exploded view of a thin optical image stabilization motor according to an embodiment of the present invention.

[0042] Figure 2 An exploded view of a thin optical image stabilization motor from another perspective according to an embodiment of the present invention.

[0043] Figure 3 It is a partial exploded view of a focus module and an anti-shake module according to an embodiment of the present invention.

[0044] Figure 4 FIG. 4 is an exploded view of a focus module and an anti-shake module according to an embodiment of the present invention.

[0045] Figure 5 FIG. 4 is a schematic diagram of the arrangement of a focusing magnet group according to an embodiment of the present invention.

[0046] Figure 6 A partial exploded view of a focus module and an anti-shake module from another perspective according to an embodiment of the present invention.

[0047] Figure 7It is a partial structural diagram of a focus module and an anti-shake module according to an embodiment of the present invention.

[0048] Description of symbols 1: Shell assembly 11: Accommodating cavity 2: Focus module 21: Focus carrier 22: Focus drive unit 221: Focus coil 222: Focusing magnet group 23: Composite guide assembly 231: Ball guide mechanism 231a: Guide groove 231b: Guide ball 232: Roller guide mechanism 232a: Limiting slot 232b: Guide roller 3: Anti-shake module 31: Support ball 32: Anti-shake carrier 33: Anti-shake drive components 331: X-axis drive unit 331a: X-axis magnet group 331b: X-axis coil 332: Y-axis drive unit 332a: Y-axis magnet assembly 332b: Y-axis coil 34: Displacement detection component 341: Hall integrated circuit 41: Card connector 43: Damping rubber layer DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0051] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of the embodiments of the present application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the application product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0053] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0054] This embodiment provides a thin optical image stabilization motor, including a housing assembly 1 , a focus module 2 and an image stabilization module 3 .

[0055] The housing assembly 1 has a containing cavity 11 extending along the optical axis direction Z axis.

[0056] The focusing module 2 includes a focusing carrier 21 and a focusing drive unit 22 movably arranged in the accommodating cavity 11. The focusing drive unit 22 includes a focusing coil 221 and a focusing magnet group 222. The focusing magnet group 222 includes three focusing magnets arranged in a Halbach array, and the magnetic field enhancement direction of the focusing magnets arranged in the Halbach array is toward the focusing coil 221.

[0057] The anti-shake module 3 includes an anti-shake carrier 32 movably connected to the focus carrier 21 through four support balls 31 arranged in a single layer, and an anti-shake driving component 33. The anti-shake driving component 33 includes an X-axis driving unit 331, a Y-axis driving unit 332 and a displacement detection component 34. The X-axis driving unit 331 includes an X-axis magnet group 331a and a corresponding X-axis coil 331b arranged on the first side of the anti-shake carrier 32, and the first side is orthogonal to the X-axis direction. The Y-axis driving unit 332 includes two groups of Y-axis magnet groups 332a and two groups of Y-axis coils 332b symmetrically arranged on the second side of the anti-shake carrier 32; the second side is orthogonal to the Y-axis direction. The displacement detection component 34 includes two Hall integrated circuits 341 respectively arranged corresponding to the two groups of Y-axis magnet groups 332a, and the Hall integrated circuit 341 maintains a detection distance with the corresponding Y-axis magnet group 332a.

[0058] The anti-shake module 3 uses a single-layer support ball 31 as a connection medium, so that the anti-shake carrier 32 is movably connected to the focus carrier 21 through the support ball 31. Compared with the previous double-layer ball structure, this design reduces the overall height of the motor, has more advantages in space utilization, can better adapt to equipment with strict space size requirements, and reduces the assembly process and the number of required parts, reduces production costs, and improves market competitiveness.

[0059] However, the single-layer ball bearing structure is prone to X-axis and Y-axis crosstalk during actual operation due to the lack of guide grooves 231a, which affects the anti-shake performance and causes unstable and blurred images. To solve this problem, the R&D team added an electromagnetic structure for rotation compensation, using two sets of Y-axis power and linkage displacement detection components 34 in the Y-axis direction to construct an innovative electromagnetic design of dual coils, dual magnets and dual ICs. The dual ICs, namely two Hall integrated circuits 341, can accurately measure the relative distance between the Y-axis magnet group 332a respectively. After detecting the distance difference, the system can quickly calculate the rotation angle of the anti-shake carrier 32, and compensate for the rotation angle of the anti-shake carrier 32 by accurately adjusting the current of the two Y-axis coils 332b, effectively improving the crosstalk problem between the X and Y axes, ensuring that the anti-shake module 3 operates stably and efficiently, and providing stable and clear picture support for shooting.

[0060] In the focusing module 2, the focusing magnets arranged in a Halbach array are used, which has the advantages of enhancing the magnetic field strength in a specific direction, weakening the magnetic field on the other side, optimizing the uniformity of the magnetic field distribution, and improving the utilization rate of the magnetic field.

[0061] Enhance the magnetic field strength in a specific direction: By arranging the focusing magnets with different magnetization directions according to the specific rules of the Halbach array, the magnetic lines of force can be gathered on one side of the magnet (i.e., in the direction toward the focusing coil 221), so that the magnetic field strength on this side is significantly enhanced. With the same amount of magnets used, the surface magnetic field strength of the focusing magnet group 222 arranged in the Halbach array in the enhanced direction is significantly improved compared to the traditional single focusing magnet. This enhanced magnetic field acts on the focusing coil 221, which can effectively improve the focusing driving force. The stronger focusing driving force makes the focusing carrier 21 move faster and more powerfully in the accommodating cavity 11, thereby significantly improving the focusing speed, reducing the time required for focusing, and meeting the user's demand for fast imaging. At the same time, it can also improve the accuracy of focusing, make the imaging clearer and sharper, reduce the image blur caused by inaccurate focusing, and optimize the focusing performance.

[0062] Weakening the magnetic field on the other side: This arrangement will strengthen the magnetic field on one side of the focus coil 221 while weakening the magnetic field lines on the other side, and can even make the magnetic field on this side close to zero, thereby obtaining a relatively ideal unilateral magnetic field. This feature can avoid interference with surrounding sensitive electronic components, achieve a self-shielding effect in the non-working area, ensure the normal operation of other electronic components in the entire optical image stabilization motor system, and improve the stability and reliability of the system.

[0063] Optimize the uniformity of magnetic field distribution: The focusing magnets arranged in the Halbach array make the magnetic field distribution relatively more uniform. During the focusing process, the uniform magnetic field helps the focusing carrier 21 to move smoothly and accurately, providing a good magnetic field environment for obtaining high-resolution image information. The uniformity of the magnetic field can reduce errors and fluctuations during the focusing process, further improve the stability and accuracy of the focus, and help to shoot high-quality images and videos.

[0064] Improve magnetic field utilization: This arrangement reduces magnetic leakage and can achieve a stronger magnetic field effect with fewer magnets. This not only reduces the demand for magnetic materials and saves production costs, but also reduces the overall weight of the entire focus module 2 and even the thin optical image stabilization motor. It is suitable for equipment application scenarios with weight and space restrictions, and improves the flexibility and adaptability of the product in design and application.

[0065] Achieving high thrust: This special arrangement can greatly increase the magnetic thrust. Compared with ordinary magnets, the focus magnets arranged in the Halbach array can generate greater force, pushing the focus carrier 21 to achieve fast and accurate focusing action, achieving a high thrust effect, meeting the needs of some application scenarios with high requirements for focusing performance and requiring fast and powerful focusing drive, and helping to achieve large-scale and high-performance development of products.

[0066] In this embodiment, the focusing module 2 is provided with a composite guide assembly 23, including a group of ball guide mechanisms 231 distributed along the optical axis direction and a group of roller guide mechanisms 232; the ball guide mechanism 231 includes a guide groove 231a formed on the inner wall of the shell and three guide balls 231b embedded in the side wall of the focusing carrier 21, and the roller guide mechanism 232 includes a limit groove 232a formed on the inner wall of the shell and a guide roller 232b embedded in the side wall of the focusing carrier 21.

[0067] The configuration of the composite guide assembly provides multi-dimensional, high-precision guide constraints for the movement of the focus carrier in the accommodating cavity. The ball guide mechanism, with the small contact area between the guide ball and the guide groove, can keenly sense and adapt to the slight deviation of the focus carrier during movement, effectively reduce the jamming caused by friction and assembly errors, and ensure that the focus carrier moves smoothly and fluently along the optical axis. At the same time, the roller guide mechanism, with the help of the cooperation between the guide roller and the limit groove, provides a larger support area and stronger load-bearing capacity, significantly enhancing the stability of the focus carrier during movement, so that it can still maintain a precise motion trajectory when subjected to large external forces or in high-speed movement. It greatly improves the overall reliability and focusing accuracy of the focus module, increases stability during movement, and effectively suppresses the occurrence of tipping.

[0068] In this embodiment, the guide ball 231b of the ball guide mechanism 231 forms a point contact rolling fit with the guide groove 231a, and the guide roller 232b of the roller guide mechanism 232 forms a line contact rolling fit with the limiting groove 232a.

[0069] This matching method has significant advantages. The point contact rolling matching makes the stress concentration effect at the contact point smaller when the guide ball 231b rolls in the guide groove 231a, which can effectively reduce wear and extend the service life of the ball and the guide groove 231a. At the same time, the point contact method also gives the focus carrier 21 a certain flexibility during movement, so that it can better respond to the instructions of the focus drive unit 22 and achieve fast and accurate focusing action. The line contact rolling matching increases the friction and restraint between the guide roller 232b and the limit groove 232a by increasing the contact area, providing more stable support and guidance for the focus carrier 21, further suppressing the shaking and deviation of the focus carrier 21 during movement, and ensuring the stability and accuracy of the focusing process.

[0070] In this embodiment, a clamping member 41 is further included which is clamped and connected to the side wall of the focusing carrier 21 . The clamping member 41 is bonded to the top of the anti-shake carrier 32 via a damping adhesive layer 43 .

[0071] It can significantly improve the dynamic characteristics of the anti-shake carrier 32 in the X-axis and Y-axis directions. In actual work, the anti-shake carrier 32 needs to perform precise and stable movements in the X-axis and Y-axis directions to achieve an effective anti-shake function. The connection method of the clamping part 41 with the focusing carrier 21 and the anti-shake carrier 32 can, while ensuring the movement flexibility of the anti-shake carrier 32, effectively suppress the unstable phenomena such as vibration and sway that may occur when the anti-shake carrier 32 moves in the X-axis and Y-axis directions through the buffering effect of the damping glue layer 43 and the stable support of the snap connection, making the movement of the anti-shake carrier 32 in these two directions smoother and more precise, thereby improving the performance of the entire optical image stabilization motor in terms of the anti-shake function and providing a strong guarantee for obtaining high-quality imaging effects.

[0072] The clamping part 41 and the side wall of the focusing carrier 21 are closely matched by mechanical snaps, which can ensure that a firm and reliable connection state is maintained between the focusing carrier 21 and the clamping part 41 under various working conditions during the normal operation of the instrument, providing a stable and reliable basic structural support for the entire optical image stabilization motor system. The clamping part 41 and the top of the anti-shake carrier 32 are bonded through the damping glue layer 43, and the damping glue layer 43 plays a buffering role here. During the focusing and anti-shake processes, the system will inevitably generate various vibrations and impact forces. If these energies are directly transmitted to the entire optical image stabilization motor structure, it may cause damage to the internal precision components and affect the stability and reliability of the system. The damping glue layer 43 has good viscoelasticity and energy dissipation characteristics and can quickly and effectively absorb and dissipate these vibration and impact energies. Specifically, when vibrations or impact forces are transmitted to the damping glue layer 43, the internal polymer materials will undergo changes in the microscopic structure, converting mechanical energy into heat energy and dissipating it, thereby greatly reducing the vibrations and impact forces transmitted to other components of the optical image stabilization motor, and thus improving the stability and reliability of the entire system.

[0073] In this embodiment, the guiding groove 231a is V-shaped, and its cross-section is a symmetric double-inclined surface structure.

[0074] The symmetric double-inclined surface structure can provide good positioning and constraint for the guiding ball 231b. No matter how the focusing carrier 21 moves in the optical axis direction, the guiding ball 231b can automatically stay in the appropriate position under the action of the V-shaped groove, ensuring that the movement direction of the focusing carrier 21 is always consistent with the optical axis direction. At the same time, the structure of the V-shaped groove also has a certain self-centering function. During the assembly process, even if there are certain deviations, the guiding ball 231b can automatically adjust its position under the guidance of the V-shaped groove, reducing the assembly difficulty, improving the assembly accuracy, and thus enhancing the performance stability of the entire focusing module 2.

[0075] In this embodiment, the limiting groove 232a is U-shaped, and its cross-section is a C-shaped structure.

[0076] The design of the U-shaped limit groove 232a provides reliable limit and support for the guide roller 232b. The U-shaped structure can effectively limit the displacement of the guide roller 232b in the horizontal and vertical directions, prevent the guide roller 232b from falling off or shifting during the movement, and ensure the stability and reliability of the roller guide mechanism 232. In addition, the structure of the U-shaped limit groove 232a is easy to process and manufacture, which can reduce production costs, improve production efficiency, and is also conducive to subsequent maintenance and repair work.

[0077] In this embodiment, the guide roller 232b is cylindrical.

[0078] The cylindrical guide roller 232b has the advantages of regular shape and easy processing and manufacturing. The standard cylindrical shape can ensure the uniformity and stability of the guide roller 232b when rolling in the limit groove 232a, reduce the change of rolling resistance caused by shape deviation, and make the movement of the focus carrier 21 more stable and smooth. At the same time, the cylindrical guide roller 232b is easier to cooperate with the limit groove 232a during the assembly process, which reduces the difficulty of assembly, improves the assembly efficiency, and is conducive to ensuring the quality and consistency of the product.

[0079] In this embodiment, the magnetization direction of each focusing magnet satisfies: The magnetization vectors of adjacent focusing magnets are arranged alternately at an angle of 90°±5°; The normal direction of the magnetic pole surface of each focusing magnet forms an inclination angle of 75°-85° with the central axis of the driving coil; The magnetization direction of the end focusing magnet closest to the driving coil is parallel to the radial direction of the housing component 1, wherein the radial direction is defined as a radial direction perpendicular to the optical axis (Z axis) and based on the central axis of the accommodating cavity 11, and the N pole points outwardly toward the inner wall of the housing component 1; Among them, the arrangement of focusing magnets constitutes a three-dimensional Halbach magnetic field enhancement structure, forming a gradient magnetic field in the driving coil area, and its magnetic flux density increases at a rate of 15%-25% / mm along the Z-axis direction.

[0080] The focusing magnets are arranged in this specific way to form a three-dimensional Halbach magnetic field enhancement structure, forming a gradient magnetic field with a specific magnetic flux density increase rate in the drive coil area, which brings significant technical effects. From the perspective of magnetic field enhancement, the three-dimensional Halbach structure achieves the superposition and enhancement effect of the magnetic field by cleverly combining the magnetization direction and position of each focusing magnet. Compared with the traditional magnetic field structure, this structure can generate a stronger magnetic field in the drive coil area, providing a stronger driving force for the drive coil, thereby effectively improving the response speed and driving ability of the focusing system.

[0081] From the perspective of gradient magnetic field characteristics, there is a magnetic flux density increase rate of 15%-25% / mm along the Z-axis direction. This gradient magnetic field can provide the focus carrier 21 with a precise driving force related to the position. During the focusing process, the focus carrier 21 can be affected by the magnetic field force that matches its position in the Z-axis direction, so as to achieve more precise position control and motion adjustment. This gradient magnetic field characteristic can effectively compensate for various interference factors in the focusing process, improve the anti-interference ability of the focusing system, ensure the high precision and stability of the focusing operation, and meet the strict requirements of modern optical equipment for high-precision focusing functions.

[0082] In this embodiment, the ball guide mechanism 231 includes three guide balls 231 b.

[0083] The design of three guide balls 231b achieves an optimal balance between structure and performance while ensuring the guiding accuracy, effectively disperses the force borne by the focusing carrier 21 during movement, reduces the force burden of a single ball, reduces the risk of wear, and extends the service life of the ball.

[0084] In this embodiment, the focusing magnet group 222, the ball guide mechanism 231 and the roller guide mechanism 232 are all arranged on the third side of the focusing carrier 21, and the third side is orthogonal to the X-axis direction or orthogonal to the Y-axis direction.

[0085] Arranging the focusing magnet group 222 , the ball guide mechanism 231 and the roller guide mechanism 232 on the same side of the focusing carrier 21 helps to achieve a compact structure and a reasonable layout.

[0086] In other embodiments, the focusing magnet group 222 is disposed on a third side of the focusing carrier 21 , and the ball guide mechanism 231 and the roller guide mechanism 232 are disposed on a fourth side of the focusing carrier 21 .

[0087] The focusing magnet group 222 is arranged on the third side, and the ball guide mechanism 231 and the roller guide mechanism 232 are arranged on the fourth side, so as to avoid possible mutual interference between the components.

[0088] In this embodiment, a lower ball groove is provided on the upper surface of the focus carrier 21, a corresponding upper ball groove is provided on the lower surface of the anti-shake carrier 32, and the support ball 31 is sandwiched between the lower ball groove and the upper ball groove.

[0089] By providing corresponding ball grooves on the focus carrier 21 and the anti-shake carrier 32, and sandwiching the support balls 31 therein, the focus carrier 21 and the anti-shake carrier 32 are flexibly and stably connected through the support balls 31 arranged in a single layer. The shape of the ball groove can be a rectangular cross-section groove, and its aspect ratio can range from 1:1 to 3:1, or a square cross-section groove, and the side length can be 1.05-1.2 times the ball diameter, or a V-shaped cross-section groove, as shown in the attached figure. Figure 6 As shown, the opening angle can be 90°±5°, and the groove depth can be 1.2-1.5 times the ball radius.

[0090] The multi-form slot design adapts to different working conditions. The rectangular slot is suitable for high-load scenarios, the square slot achieves omnidirectional limit, and the V-shaped slot improves the guiding accuracy through the self-centering characteristics of the inclined surface. The symmetrical inclined surface structure of the V-shaped cross-section groove enables the ball to always maintain a three-point contact state, reducing the radial movement by more than 35% compared to the traditional arc groove.

[0091] The housing assembly may have a number of magnetically conductive functional components embedded therein, including: The first magnetic guide sheet group is embedded at the terminal position of the focus module movement track; The second magnetic conductive sheet group is arranged on the reset reference surface of the anti-shake module; The magnetic conductive sheet forms a magnetic attraction fit with the magnet group of the corresponding module.

[0092] Innovative advantages of magnetic adsorption positioning system: (1) The independent setting of the dual magnetic guide plate group realizes modular magnetic positioning. The adsorption force of the focus module is 20-30% higher than that of the anti-shake module, meeting the differentiated fixing requirements of different motion components; (2) The embedded installation of the magnetic guide sheet integrates the magnetic circuit system with the mechanical structure, saving more than 30% of the axial space and avoiding the magnetic interference problem caused by exposed magnetic components; (3) Through the design of magnetic induction intensity gradient, a perceptible magnetic suction frustration is generated when the module reaches the predetermined position. In conjunction with the position sensor, the reset accuracy can be improved to the ±3μm level; (4) Non-contact magnetic fixation effectively eliminates mechanical collision wear and tear, and has been tested to extend the service life of the module to more than 500,000 cycles.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A thin optical image stabilization motor, characterized in that: including a housing assembly (1) having a receiving cavity (11) extending along the optical axis direction; a focusing module (2) including a focusing carrier (21) and a focusing driving unit (22); the focusing carrier (21) is movably disposed within the receiving cavity (11); the focusing driving unit (22) includes a focusing coil (221) and a focusing magnet group (222); the focusing magnet group (222) includes at least three focusing magnets arranged in a Halbach array, and the magnetic field enhancement direction of the focusing magnets arranged in the Halbach array faces the focusing coil (221); an anti-shake module (3) including an anti-shake carrier (32) movably connected to the focusing carrier (21) through at least three support balls (31) arranged in a single layer, and an anti-shake driving assembly (33), the anti-shake driving assembly (33) includes: an X-axis driving unit (331) having an X-axis magnet group (331a) disposed on a first side of the anti-shake carrier (32) and a corresponding X-axis coil (331b), the first side being orthogonal to the X-axis direction; a Y-axis driving unit (332) having two sets of Y-axis magnet groups (332a) symmetrically disposed on a second side of the anti-shake carrier (32) and two corresponding sets of Y-axis coils (332b); the second side being orthogonal to the Y-axis direction; a displacement detection component (34) including two Hall integrated circuits (341) respectively corresponding to the two sets of Y-axis magnet groups (332a), the Hall integrated circuits (341) maintaining a detection distance from the corresponding Y-axis magnet groups (332a).

2. The thin optical image stabilization motor according to claim 1, characterized in that: The focusing module (2) is provided with a composite guiding component (23), including: at least one set of ball guiding mechanisms (231) distributed along the optical axis direction, including a guiding groove (231a) formed on the inner wall of the housing assembly (1) and at least one guiding ball (231b) embedded in the side wall of the focusing carrier (21); at least one set of roller guiding mechanisms (232), including a limiting groove (232a) formed on the inner wall of the housing assembly (1) and at least one guiding roller (232b) embedded in the side wall of the focusing carrier (21).

3. The thin optical image stabilization motor according to claim 2, characterized in that: The guiding ball (231b) of the ball guiding mechanism (231) forms a point contact rolling fit with the guiding groove (231a), and the guiding roller (232b) of the roller guiding mechanism (232) forms a line contact rolling fit with the limiting groove (232a).

4. The thin optical image stabilization motor according to claim 1, characterized in that: It further includes a clamping member (41) snap-connected to the side wall of the focusing carrier (21), and the clamping member (41) is bonded to the top of the anti-shake carrier (32) through a damping adhesive layer (43).

5. The thin optical image stabilization motor according to claim 2, characterized in that: The guiding groove (231a) is V-shaped, and its cross-section is a symmetric double-inclined surface structure.

6. The thin optical image stabilization motor according to claim 2, characterized in that: The limiting groove (232a) is U-shaped, and its cross-section is a C-shaped structure, and the guiding roller (232b) is cylindrical.

7. The thin optical image stabilization motor according to claim 2, characterized in that: The focusing magnet group (222), the ball guiding mechanism (231), and the roller guiding mechanism (232) are all disposed on a third side of the focusing carrier (21), and the third side is orthogonal to the X-axis direction or orthogonal to the Y-axis direction.

8. The thin optical image stabilization motor according to claim 2, characterized in that: The focusing magnet group (222) is arranged on a third side of the focusing carrier (21), and the ball guide mechanism (231) and the roller guide mechanism (232) are arranged on a fourth side of the focusing carrier (21).

9. A camera module, characterized in that: The invention comprises a thin optical image stabilization motor as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: It comprises a device housing and a camera module as described in claim 9, wherein the camera module is arranged in the device housing.

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