Optical focusing module, driving device, camera and electronic equipment

Abstract

The invention relates to an optical focusing module, a driving device, a camera and electronic equipment, the optical focusing module comprises a main shell, a movable shell, a fixed lens group, a movable lens group, at least two guide columns parallel to the optical axis direction and a focusing power unit, and the main shell and the movable shell are oppositely arranged along the optical axis direction; the fixed lens group comprises at least two optical lenses which are rigidly fixed in the optical axis channel of the main shell; the movable lens group comprises at least two optical lenses which are rigidly fixed in the optical axis channel of the movable shell; the guide column is installed on the main shell and is in sliding fit with the movable shell. And the focusing power unit is used for driving the movable shell to move along the axial direction of the guide post so as to realize internal focusing operation. According to the optical focusing module, the focusing operation is implemented by adopting an inner focusing mode, so that a precise automatic focusing function can be achieved, and the optical quality is further optimized and improved.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and particularly to an internal focusing optical module with a guide post guiding mechanism, which is particularly applicable to scenarios such as camera lenses for high-precision autofocus, industrial inspection equipment, and medical imaging instruments. By optimizing the mechanical structure and focusing method, the imaging stability and focusing efficiency are improved. Background Art

[0002] Traditional focusing modules mostly adopt external or external focusing designs. In the case of external focusing, the entire lens group needs to be moved, which will cause a relatively obvious change in the lens length. On the one hand, such a large change in the lens length is extremely likely to cause vibration, seriously affecting the imaging stability; on the other hand, the frequent telescoping of the lens greatly increases the probability of dust entering the lens interior. Once the dust enters, it will damage the lens sealing, and ultimately have a negative impact on the imaging quality. Summary of the Invention

[0003] In view of this, the present invention provides an optical focusing module, which can achieve accurate autofocus function by adopting an internal focusing method, thereby further optimizing and improving the optical quality.

[0004] The object of the present invention is achieved by the following technical solutions: An optical focusing module includes a main housing, a movable housing, a fixed lens group, a movable lens group, at least two guide posts parallel to the optical axis direction, and a focusing power unit. The main housing and the movable housing are oppositely arranged along the optical axis direction; the fixed lens group includes at least two optical lenses and is rigidly fixed in the optical axis channel of the main housing; the movable lens group includes at least two optical lenses and is rigidly fixed in the optical axis channel of the movable housing; the guide posts are installed on the main housing and form a sliding fit with the movable housing; the focusing power unit drives the movable housing to move along the axial direction of the guide posts to perform internal focusing operation.

[0005] As a key guiding mechanism in this optical focusing module, the guide post has significant and non-negligible advantages. From the perspective of mechanical structure principle, it can effectively maintain a highly accurate perpendicularity between the movable housing and the main housing during the entire focusing process. This characteristic is crucial for ensuring that light travels accurately along the preset optical axis, because any slight deviation in perpendicularity may cause the light propagation path to shift, thereby affecting the clarity and accuracy of imaging.

[0006] Meanwhile, the guide posts play a core role in ensuring the stability of movement. When the focusing power unit drives the movable housing to move along the axial direction of the guide posts, the guide posts, with their rigid structures and good sliding fit design with the movable housing, can greatly reduce the unstable factors such as shaking and jitter generated during the movement of the movable housing. This stable movement state is of decisive significance for achieving precise focusing operations.

[0007] In addition, this optical focusing module uses the internal focusing method for focusing, that is, the focusing power unit pushes the movable lens group to move relative to the fixed lens group in the optical axis direction to complete the focusing process. Compared with other focusing methods, the internal focusing method can more effectively reduce the overall volume change of the lens, avoid interference factors such as dust and moisture that may be introduced due to the frequent expansion and contraction of the external structure of the lens, thereby improving the sealing performance and durability of the lens. Moreover, the internal focusing method can significantly improve the focusing speed and accuracy, enabling the lens to quickly and accurately adjust the focal length when facing shooting objects at different distances, and realizing precise autofocus function. This not only greatly improves the shooting efficiency, but also further improves the optical imaging quality, providing users with clearer, sharper and more real image effects, meeting the strict requirements for high-quality imaging in various professional and daily shooting scenarios.

[0008] Preferably, the focusing power unit includes a Z-axis driving coil fixed to the inner side wall of the main housing and one or more Z-axis magnets fixed to the outer side wall of the movable housing.

[0009] The internal focusing method enables the movable lens group to only perform relative displacement inside the lens during the focusing process, without driving the external structure of the entire lens to perform large-scale expansion and contraction movements like the external focusing method. This characteristic fundamentally limits the mass scale of the movable part, enabling the movable housing to reduce its weight as much as possible on the premise of meeting the optical performance requirements. The lighter movable housing has lower inertia at the physical level, which means that during the focusing drive process, it can achieve fast and precise position adjustment with a smaller driving force, thereby effectively improving the focusing speed and accuracy.

[0010] At the same time, the excellent guiding stability provided by the guide posts plays a crucial role. With its high-precision processing technology and reasonable layout design, the guide posts can provide a stable and precise guiding path for the movable housing when it moves along the axial direction. This stability not only ensures the straightness and perpendicularity of the movable housing during movement, effectively avoiding focusing errors caused by shaking or deviation, but also makes the entire focusing process smoother and more stable, greatly improving the reliability and durability of the optical focusing module.

[0011] Based on two key factors: the relatively light weight of the movable housing and the excellent guiding stability of the guide posts, this focusing power unit only needs to set a group of coil magnets on one side to achieve stable focusing operation. This simple and efficient design scheme has outstanding advantages in many aspects. From the perspective of cost control, reducing the setting of a group of coil magnets directly reduces the raw material procurement cost and the assembly cost during the manufacturing process, effectively improving the economic benefits of the product. From the perspective of structural design, the simplified drive structure reduces the number of unnecessary components, making the internal space layout of the entire optical focusing module more compact and reasonable, which is conducive to improving the integration and miniaturization of the product, thus better meeting the development needs of modern optical devices for thinness, lightness, and portability. In addition, the design of setting a group of coil magnets on one side also reduces the complexity of the system, reduces potential failure points, improves the stability and reliability of the product, reduces the after-sales maintenance cost, and further enhances the competitiveness of the product in the market.

[0012] Another implementation of the present invention is a driving device, including the optical focusing module as described above.

[0013] Integrating the optical focusing module into the driving device realizes the high coordination and optimized integration among various components. With its advanced internal focusing method, stable guide post guiding structure, and efficient focusing power unit, the optical focusing module provides accurate and reliable focusing ability for the driving device. The advantages of the internal focusing method, such as reducing the change in lens volume, improving the focusing speed and accuracy, enable the driving device to better adapt to diverse working environments and task requirements.

[0014] Preferably, it further includes a housing assembly and an inverting anti-shake module. The housing assembly includes an outer cover and an upper cover fixed to the upper opening of the outer cover; the inverting anti-shake module includes a plurality of suspension wires and an anti-shake power unit. The plurality of suspension wires suspend the main housing on the lower surface of the upper cover, and the anti-shake power unit is configured to drive the main housing to move in a plane perpendicular to the optical axis direction below the upper cover.

[0015] The inverting anti-shake module adopts a unique inverting structure design. The plurality of suspension wires suspend the main housing on the lower surface of the upper cover. This layout makes the distance ΔZ along the optical axis direction between the center of mass of the optical focusing module and the thrust center of the anti-shake power unit smaller than that of a conventional upright anti-shake module. Analyzing in depth from the principles of physics and engineering mechanics, the reduction of this distance is of great significance.

[0016] During the anti-shake process, the anti-shake power unit drives the main housing to move in a plane perpendicular to the optical axis direction under the upper cover by applying a thrust force, thereby realizing the anti-shake function. A smaller spacing ΔZ can significantly reduce the adverse effects caused by the anti-shake thrust force. Among them, the most crucial is to effectively reduce the lens tilt mode caused by the OIS (Optical Image Stabilization) thrust force. Lens tilt will cause the light propagation path to deviate, which will seriously affect the imaging quality and cause problems such as image blurring and distortion. By reducing the spacing ΔZ, the possibility of lens tilt is reduced, ensuring that light can propagate more accurately along the preset path, greatly improving the clarity and accuracy of imaging.

[0017] In addition, the smaller spacing ΔZ plays a decisive role in improving the control bandwidth. The control bandwidth is a crucial parameter in the optical image stabilization system, which is directly related to the system's response ability to vibrations of different frequencies. A larger control bandwidth means that the anti-shake system can compensate for various vibrations more quickly and accurately, so that it can still maintain a good anti-shake effect in a more complex vibration environment. The flip-chip anti-shake module effectively improves the control bandwidth by optimizing the distance between the center of mass and the thrust center, enabling the optical focusing module to respond quickly in the face of different vibration frequencies and amplitudes, timely adjust the position of the main housing, and achieve efficient and stable anti-shake functions.

[0018] Preferably, it further includes a ship-shaped prism assembly, which includes an optical prism with a trapezoidal cross-section, a first avoidance groove provided on the side wall of the main housing, a second avoidance groove provided at the corresponding position of the movable housing, and a third avoidance groove provided on the side wall of the outer cover. The incident surface and the exit surface of the optical prism form an optical path turning angle of 180°±1°; the first, second, and third avoidance grooves cooperate to form an accommodation space, and a part of the optical prism is embedded in the accommodation space.

[0019] The introduction of the optical prism with a trapezoidal cross-section (ship-shaped prism) and the related avoidance groove design, through ingenious spatial layout and precise optical design, have successfully reduced the height of the overall driving device, optimized the optical performance, improved the applicability and market competitiveness of the product, and provided new ideas and directions for the development of the optical focusing technology field.

[0020] From the perspective of in-depth analysis of the overall structural layout and space utilization, the introduction of the ship-shaped prism component aims to achieve the efficient integration and optimization of the overall space, so as to achieve the key goal of reducing the height of the overall drive device. In the design of traditional optical devices, the ship-shaped prism is usually arranged outside the drive device, which undoubtedly increases the overall height of the device and is not conducive to the development of the device towards miniaturization and thinness. In this invention, an innovative attempt is made to skillfully insert the ship-shaped prism into the drive device, and by making openings in the light path side of each part of the drive device to avoid interference, the problem of space layout is successfully solved.

[0021] Specifically, the first avoidance groove provided on the side wall of the main housing, the second avoidance groove provided at the corresponding position of the movable housing, and the third avoidance groove provided on the side wall of the outer cover cooperate to form an accommodation space, and a part of the optical prism can be accurately embedded in this accommodation space. This design method not only makes full use of the internal space that might otherwise be wasted, but also through reasonable layout planning, makes the spatial relationship between each component more compact and orderly. Compared with the traditional design, the height of the overall drive device is significantly reduced, which is of crucial significance for meeting the stringent requirements of modern optical devices for miniaturization and integration.

[0022] From the perspective of product applicability and market competitiveness, the design of reducing the height of the overall drive device enables this optical focusing module to better adapt to various optical devices with strict space size limitations. Whether it is in portable electronic devices such as smartphones and tablets, or in some professional optical instruments that are sensitive to the volume and weight of the device, this module can stand out with its compact design and excellent optical performance. This high degree of applicability not only broadens the application fields of the product, but also greatly enhances the competitiveness of the product in the market, providing strong support for meeting the diverse needs of different customer groups.

[0023] Preferably, the guide post, the Z-axis drive coil and the Z-axis magnet are arranged in the side area of the accommodation space along the optical axis direction, and in the horizontal projection plane, the guide post, the Z-axis drive coil and the Z-axis magnet have no overlapping area with the accommodation space.

[0024] If the guide pillar, Z-axis drive coil, and Z-axis magnet are not arranged reasonably like this, but are placed randomly or overlap with the accommodation space, it will inevitably lead to these components occupying the space resources in the overall height direction of the drive device. Since the drive device is often subject to strict space size limitations in actual application scenarios, especially the constraints in terms of height are more significant. Once these key components occupy too much height space, it will directly cause the overall height of the drive device to increase. The increase in the height of the drive device may trigger a series of negative effects. First, during the equipment integration process, an overly tall drive device may not be compatible with some optical devices with strict space size requirements, restricting the application range and compatibility of the product. Second, a taller drive device may disrupt the compactness and coordination of the entire optical system, increasing the overall volume and weight of the equipment, which runs counter to the current trend of optical devices towards miniaturization and lightweight. The layout method adopted in the present invention effectively avoids the above problems. By precisely planning the positions of the guide pillar, Z-axis drive coil, and Z-axis magnet to avoid them from overlapping with the accommodation space, on the premise of ensuring the normal functions of each component, the space occupied by the drive device in the height direction is saved to the greatest extent. This not only helps to maintain the compact structure of the drive device, enabling it to better adapt to various complex application environments, but also provides strong support for the miniaturization and integration development of optical devices, significantly enhancing the competitiveness of the product in the market.

[0025] Preferably, the anti-shake power unit includes an X-axis drive unit and a Y-axis drive unit. The X-axis drive unit includes an X-axis drive coil fixed to the lower surface of the outer cover and an X-axis magnet group fixed to the top of the main housing. The X-axis magnet group is composed of at least three permanent magnets arranged in a Halbach array, and the magnetization directions of the magnets rotate 90° in sequence. The Y-axis drive unit includes a Y-axis drive coil fixed to the lower surface of the outer cover and a Y-axis magnet group fixed to the top of the main housing. The Y-axis magnet group is composed of at least three permanent magnets arranged in a Halbach array, and the magnetization directions of the magnets rotate 90° in sequence. Among them, the X-axis magnet group and the Y-axis magnet group are orthogonally arranged in the top view projection plane, and both are located in the same side half-region of the main housing.

[0026] The present invention adopts the design concept of unilateral thrust. By precisely planning the direction and range of the magnetic force action, it can effectively concentrate the magnetic field energy and significantly reduce the occurrence of magnetic leakage. This not only improves the utilization rate of the magnetic field energy, enabling the anti-shake power unit to generate a greater driving force under the same power consumption, enhancing the energy utilization efficiency, but also reduces the electromagnetic interference to the surrounding environment, enhancing the stability and anti-interference ability of the entire system, ensuring that the optical focusing module and related equipment can operate efficiently in a stable electromagnetic environment.

[0027] In terms of enhancing magnetic thrust, the application of the Halbach magnetic array plays a key role. The Halbach magnetic array is a special arrangement of permanent magnets. By arranging at least three permanent magnets according to a specific pattern, with the magnetization direction of each magnet rotating 90° in sequence, it can generate a strong magnetic field in a specific direction, thereby significantly increasing the magnetic thrust. Compared with the traditional arrangement of permanent magnets, under the conditions of the same number and volume of permanent magnets, the Halbach magnetic array can generate several times or even higher magnetic thrust. This powerful magnetic thrust enables the anti-shake power unit to drive the main housing to move more quickly and accurately in the plane perpendicular to the optical axis direction when meeting the anti-shake requirements of the main housing, effectively compensating for the displacement deviation caused by external vibrations, thus significantly improving the effect of optical image stabilization and providing users with a more stable and clear imaging experience.

[0028] Preferably, the X-axis drive coil and the Y-axis drive coil are planar printed coils, including multi-layer spiral windings formed on a flexible circuit board.

[0029] In terms of manufacturing process, planar printed coils utilize printed circuit board technology to simplify the manufacturing process and reduce labor and time costs. Their high-precision printing ensures dimensional accuracy and consistency, improves the yield rate, reduces production costs, and enhances the price competitiveness of products. In terms of space utilization, the flat structure of planar printed coils saves axial space, facilitating the compact integration of the optical focusing module. It achieves a large inductance value within a limited plane, and the flexible circuit board can be flexibly arranged to optimize space utilization, promoting the miniaturization and integration of equipment. In terms of electrical performance, the multi-layer structure increases the number of turns, raises the inductance value, and enhances the driving force. At the same time, the distributed capacitance is small, improving the high-frequency response performance, making the anti-shake drive faster and more accurate, and ensuring the imaging quality. In terms of reliability and stability, the combination of planar printed coils and flexible circuit boards has good mechanical stability and vibration resistance. The flexible circuit board buffers stress, and the printed connections are firm, reducing the risk of failures and ensuring the long-term stable operation of the module.

[0030] Another implementation of the present invention is a camera, including the driving device as described above.

[0031] Another implementation of the present invention is an electronic device, including the camera as described above.

[0032] The beneficial effects of the present invention compared with the prior art are: In the optical focusing module of the present invention, the guide post, as a key guiding mechanism in this optical focusing module, has significant and non-negligible advantages. Analyzing from the perspective of mechanical structure principles, it can effectively maintain a highly accurate perpendicularity between the movable housing and the main housing throughout the focusing process. This characteristic is crucial for ensuring that light travels accurately along the preset optical axis because any slight deviation in perpendicularity may cause the light propagation path to shift, thereby affecting the clarity and accuracy of imaging.

[0033] Meanwhile, the guide posts play a core role in ensuring the stability of movement. When the focusing power unit drives the movable housing to move along the axial direction of the guide posts, the guide posts, relying on their own rigid structures and the well-designed sliding fit with the movable housing, can greatly reduce the unstable factors such as shaking and jitter generated during the movement of the movable housing. This stable movement state is decisive for achieving precise focusing operations.

[0034] In addition, this optical focusing module uses the internal focusing method for focusing, that is, the focusing process is completed by the focusing power unit pushing the movable lens group to move relative to the fixed lens group in the optical axis direction. Compared with other focusing methods, the internal focusing method can more effectively reduce the overall volume change of the lens, avoid interference factors such as dust and moisture that may be introduced due to the frequent expansion and contraction of the external structure of the lens, thereby improving the sealing performance and durability of the lens. Moreover, the internal focusing method can significantly improve the focusing speed and accuracy, enabling the lens to quickly and accurately adjust the focal length when facing shooting objects at different distances, achieving precise autofocus function. This not only greatly improves the shooting efficiency but also further improves the optical imaging quality, providing users with clearer, sharper, and more realistic image effects, meeting the strict requirements for high-quality imaging in various professional and daily shooting scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0036] Figure 1 It is an exploded view of the driving device according to an embodiment of the present invention.

[0037] Figure 2 It is an exploded view of the driving device from another perspective according to an embodiment of the present invention.

[0038] Figure 3 It is an exploded view of the optical focusing module according to an embodiment of the present invention.

[0039] Figure 4 It is a structural diagram of the driving device according to an embodiment of the present invention.

[0040] Figure 5 It is a partial structural diagram of the driving device according to an embodiment of the present invention.

[0041] Figure 6 It is a schematic diagram of the light path of the driving device according to an embodiment of the present invention.

[0042] Figure 7 Schematic diagram of ΔZ in an embodiment of the present invention.

[0043] Figure 8 Schematic diagram of the arrangement of three permanent magnets in a Halbach array in an embodiment of the present invention.

[0044] Label description Optical focusing module (100), main housing (110), movable housing (120), fixed lens group (130), movable lens group (140), guide post (150), focusing power unit (160), Z-axis drive coil (161), Z-axis magnet (162), housing assembly (200), outer cover (210), upper cover (220), flip-type anti-shake module (300), suspension wire (310), X-axis drive unit (320), X-axis magnet group (321), X-axis drive coil (322), Y-axis drive unit (330), Y-axis magnet group (331), Y-axis drive coil (332), ship-shaped prism assembly (400), optical prism (410), first avoidance groove (111), second avoidance groove (121), third avoidance groove (211). Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated herein can be arranged and designed in various different configurations.

[0046] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0047] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It 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 should not be construed as a limitation to the present application.

[0048] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0049] The technical solutions in the present application will be described below with reference to the drawings.

[0050] This embodiment provides a driving device, including an optical focusing module 100, which includes a main housing 110, a movable housing 120, a fixed lens group 130, a movable lens group 140, at least two guide posts 150 parallel to the optical axis direction, and a focusing power unit 160. The main housing 110 and the movable housing 120 are oppositely arranged along the optical axis direction; the fixed lens group 130 includes at least two optical lenses and is rigidly fixed in the optical axis channel of the main housing 110; the movable lens group 140 includes at least two optical lenses and is rigidly fixed in the optical axis channel of the movable housing 120; the guide posts 150 are installed on the main housing 110 and form a sliding fit with the movable housing 120; the focusing power unit 160 drives the movable housing 120 to move axially along the guide posts 150 to achieve an internal focusing operation.

[0051] As a key guiding mechanism in this optical focusing module 100, the guide posts 150 have significant and non-negligible advantages. Analyzing from the perspective of mechanical structure principles, it can effectively maintain a highly accurate perpendicularity between the movable housing 120 and the main housing 110 during the entire focusing process. This characteristic is crucial for ensuring that light propagates accurately along the preset optical axis, because any slight deviation in perpendicularity may cause the light propagation path to shift, thereby affecting the clarity and accuracy of imaging.

[0052] Meanwhile, the guide post 150 plays a core role in ensuring the moving stability. When the focusing power unit 160 drives the movable housing 120 to move along the axial direction of the guide post 150, the guide post 150, with its rigid structure and good sliding fit design with the movable housing 120, can greatly reduce the unstable factors such as shaking and jitter generated during the movement of the movable housing 120. This stable moving state is of decisive significance for achieving precise focusing operations.

[0053] In addition, the optical focusing module 100 of the present invention adopts an internal focusing method for focusing, that is, the focusing power unit 160 is used to push the movable lens group 140 to move relative to the fixed lens group 130 in the optical axis direction to complete the focusing process. Compared with other focusing methods, the internal focusing method can more effectively reduce the overall volume change of the lens, avoid interference factors such as dust and moisture that may be introduced due to the frequent expansion and contraction of the external structure of the lens, thereby improving the sealing performance and durability of the lens. Moreover, the internal focusing method can significantly improve the focusing speed and accuracy, enabling the lens to quickly and accurately adjust the focal length when facing shooting objects at different distances, and realizing precise autofocus function. This not only greatly improves the shooting efficiency, but also further improves the optical imaging quality, providing users with clearer, sharper and more real image effects, meeting the strict requirements for high-quality imaging in various professional and daily shooting scenarios.

[0054] In this embodiment, the focusing power unit 160 includes a Z-axis drive coil 161 fixed to the inner side wall of the main housing 110 and one or more Z-axis magnets 162 fixed to the outer side wall of the movable housing 120.

[0055] The internal focusing method enables the movable lens group 140 to only perform relative displacement inside the lens during the focusing process, without driving the external structure of the entire lens to perform large-scale expansion and contraction movements like the external focusing method. This characteristic fundamentally limits the mass scale of the movable part, enabling the movable housing 120 to be as light as possible on the premise of meeting the optical performance requirements. The lighter movable housing 120 has lower inertia at the physical level, which means that during the focusing drive process, rapid and precise position adjustment can be achieved with a smaller driving force, thereby effectively improving the focusing speed and accuracy.

[0056] Meanwhile, the excellent guiding stability provided by the guide post 150 plays a crucial role. With its high-precision machining process and reasonable layout design, the guide post 150 can provide a stable and accurate guiding path for the movable housing 120 when it moves axially. This stability not only ensures the straightness and perpendicularity of the movable housing 120 during movement, effectively avoiding focus errors caused by shaking or deviation, but also makes the entire focusing process smoother and more fluent, greatly enhancing the reliability and durability of the optical focusing module 100.

[0057] Based on the two key factors that the movable housing 120 is relatively light in weight and the guide post 150 has excellent guiding stability, this focusing power unit 160 only needs to set a group of coil magnets on one side to achieve stable focusing operation. This simple and efficient design scheme has many outstanding advantages. From the perspective of cost control, reducing the setting of a group of coil magnets directly reduces the raw material procurement cost and the assembly cost during the manufacturing process, effectively enhancing the economic benefits of the product. From the perspective of structural design, the simplified drive structure reduces the number of unnecessary components, making the internal space layout of the entire optical focusing module 100 more compact and reasonable, which is conducive to improving the integration and miniaturization of the product, thus better meeting the development needs of modern optical devices for being thinner, lighter, and more portable. In addition, the design of setting a group of coil magnets on one side also reduces the complexity of the system, reduces potential failure points, improves the stability and reliability of the product, reduces the after-sales maintenance cost, and further enhances the competitiveness of the product in the market.

[0058] In this embodiment, the drive device further includes a housing assembly 200 and an inverting anti-shake module 300. The housing assembly 200 includes an outer cover 210 and an upper cover 220 fixed to the upper end opening of the outer cover 210; the inverting anti-shake module 300 includes a plurality of suspension wires 310 and an anti-shake power unit. The plurality of suspension wires 310 suspend the main housing 110 on the lower surface of the upper cover 220, and the anti-shake power unit is configured to drive the main housing 110 to move in a plane perpendicular to the optical axis direction below the upper cover 220.

[0059] The inverting anti-shake module 300 adopts a unique inverting structure design. The plurality of suspension wires 310 suspend the main housing 110 on the lower surface of the upper cover 220. This layout makes the distance ΔZ along the optical axis direction between the center of mass of the optical focusing module 100 and the thrust center of the anti-shake power unit smaller than that of a conventional upright anti-shake module. From the perspective of physical principles and engineering mechanics, the reduction of this distance is of great significance.

[0060] During the anti-shake process, the anti-shake power unit drives the main housing 110 to move in a plane perpendicular to the optical axis direction below the upper cover 220 by applying a thrust force, thereby achieving the anti-shake function. And a smaller spacing ΔZ can significantly reduce the adverse effects caused by the anti-shake thrust force. Among them, the most crucial thing is to effectively reduce the lenstilt mode caused by the OIS (Optical Image Stabilization) thrust force. Lens tilt will cause the light propagation path to deviate, which will seriously affect the imaging quality, resulting in problems such as blurred and distorted images. By reducing the spacing ΔZ, the possibility of lens tilt is reduced, thereby ensuring that light can propagate more accurately along the preset path, greatly improving the clarity and accuracy of imaging.

[0061] In addition, a smaller spacing ΔZ plays a decisive role in improving the control bandwidth. The control bandwidth is a crucial parameter in the optical image stabilization system, which is directly related to the system's response ability to vibrations of different frequencies. A larger control bandwidth means that the anti-shake system can compensate for various vibrations more quickly and accurately, so that it can still maintain a good anti-shake effect in a more complex vibration environment. The flip-chip anti-shake module 300 effectively improves the control bandwidth by optimizing the distance between the center of mass and the center of thrust, enabling the optical focusing module 100 to quickly respond and timely adjust the position of the main housing 110 in the face of different vibration frequencies and amplitudes, achieving an efficient and stable anti-shake function.

[0062] In this embodiment, it further includes a ship-shaped prism assembly 400, which includes an optical prism 410 with a trapezoidal cross-section, a first avoidance groove 111 provided on the side wall of the main housing 110, a second avoidance groove 121 provided at the corresponding position of the movable housing 120, and a third avoidance groove 211 provided on the side wall of the outer cover 210. The incident surface and the exit surface of the optical prism 410 form an optical path turning angle of 180°±1°; the first 111, second 121, and third 211 avoidance grooves cooperate to form an accommodation space, and a part of the optical prism 410 is embedded in the accommodation space.

[0063] The introduction of the optical prism 410 (ship-shaped prism) with a trapezoidal cross-section and the related avoidance groove design, through ingenious spatial layout and precise optical design, have successfully reduced the height of the overall drive device, optimized the optical performance, improved the applicability and market competitiveness of the product, and provided new ideas and directions for the development of the optical focusing technology field.

[0064] From the perspective of overall structural layout and space utilization, the introduction of the ship-shaped prism assembly 400 is intended to achieve efficient integration and optimization of the overall space, so as to achieve the key goal of reducing the height of the overall drive device. In traditional optical equipment design, the ship-shaped prism is usually set outside the drive device, which undoubtedly increases the overall height of the device and is not conducive to the development of the device in the direction of miniaturization and lightness. The present invention innovatively attempts to cleverly insert the ship-shaped prism into the interior of the drive device, and successfully solves the spatial layout problem by opening holes on the optical path side of the various parts of the drive device.

[0065] Specifically, the first avoidance groove 111 provided on the side wall of the main housing 110, the second avoidance groove 121 provided at the corresponding position of the movable housing 120, and the third avoidance groove 211 provided on the side wall of the outer cover 210 cooperate to form a storage space, and a part of the optical prism 410 can be accurately embedded in the storage space. This design method not only makes full use of the internal space that may have been wasted, but also makes the spatial relationship between the various components more compact and orderly through reasonable layout planning. Compared with the traditional design, the height of the overall drive device can be significantly reduced, which is of vital significance for meeting the stringent requirements of modern optical equipment for miniaturization and integration.

[0066] From the perspective of product applicability and market competitiveness, the design of reducing the height of the overall drive device enables the optical focus module 100 to better adapt to various optical devices with strict space size restrictions. Whether in portable electronic devices such as smart phones and tablets, or in some professional optical instruments that are sensitive to device size and weight, the module can stand out with its compact design and excellent optical performance. This high degree of applicability not only broadens the application field of the product, but also greatly enhances the competitiveness of the product in the market, providing strong support for meeting the diverse needs of different customer groups.

[0067] In this embodiment, the guide column 150, the Z-axis drive coil 161 and the Z-axis magnet 162 are arranged in the side area of ​​the accommodating space along the optical axis direction, and on the horizontal projection plane, the guide column 150, the Z-axis drive coil 161 and the Z-axis magnet 162 have no overlapping area with the accommodating space.

[0068] If the guide pillar 150, the Z-axis drive coil 161, and the Z-axis magnet 162 are not arranged reasonably as such, but are placed randomly or overlap with the accommodation space, it will inevitably lead to these components occupying the space resources in the overall height direction of the drive device. Since the drive device is often subject to strict space size limitations in actual application scenarios, especially the constraints in terms of height are more significant. Once these key components occupy too much height space, it will directly cause the overall height of the drive device to increase. The increase in the height of the drive device may trigger a series of negative effects. First, during the equipment integration process, the too-high drive device may not be compatible with some optical devices with strict space size requirements, restricting the application scope and compatibility of the product. Second, the relatively high drive device may damage the compactness and coordination of the entire optical system, increasing the overall volume and weight of the equipment, which runs counter to the current trend of the development of optical devices towards miniaturization and lightweight. The layout method adopted in the present invention effectively avoids the above problems. By precisely planning the positions of the guide pillar 150, the Z-axis drive coil 161, and the Z-axis magnet 162 to avoid them from the accommodation space, while ensuring the normal functions of each component, the space occupied by the drive device in the height direction is saved to the greatest extent. This not only helps to maintain the compact structure of the drive device, enabling it to better adapt to various complex application environments, but also provides strong support for the miniaturization and integration development of optical devices, significantly enhancing the competitiveness of the product in the market.

[0069] In this embodiment, the anti-shake power unit includes an X-axis drive unit 320 and a Y-axis drive unit 330. The X-axis drive unit 320 includes an X-axis drive coil 322 fixed to the lower surface of the outer cover and an X-axis magnet group 321 fixed to the top of the main housing 110. The X-axis magnet group 321 is arranged by at least three permanent magnets in a Halbach array, and the magnetization directions of the magnets rotate 90° in sequence. The Y-axis drive unit 330 includes a Y-axis drive coil 332 fixed to the lower surface of the outer cover and a Y-axis magnet group 331 fixed to the top of the main housing 110. The Y-axis magnet group 331 is arranged by at least three permanent magnets in a Halbach array, and the magnetization directions of the magnets rotate 90° in sequence. Among them, the X-axis magnet group 321 and the Y-axis magnet group 331 are orthogonally arranged in the top view projection plane, and both are located in the same side half area of the main housing 110.

[0070] The present invention adopts the design concept of unilateral thrust. By precisely planning the direction and range of the magnetic force action, it can effectively concentrate the magnetic field energy and significantly reduce the occurrence of magnetic leakage. This not only improves the utilization rate of the magnetic field energy, enabling the anti-shake power unit to generate a greater driving force under the same power consumption, thus enhancing the energy utilization efficiency, but also reduces the electromagnetic interference to the surrounding environment, enhances the stability and anti-interference ability of the entire system, and ensures that the optical focusing module 100 and related devices can operate efficiently in a stable electromagnetic environment.

[0071] In terms of enhancing the magnetic thrust, the application of the Halbach magnetic array plays a key role. The Halbach magnetic array is a special arrangement of permanent magnets. By arranging at least three permanent magnets according to a specific rule, with the magnetization direction of each magnet rotating 90° in sequence, it can generate a strong magnetic field in a specific direction, thereby greatly increasing the magnetic thrust. Compared with the traditional arrangement of permanent magnets, under the conditions of the same number and volume of permanent magnets, the Halbach magnetic array can generate several times or even higher magnetic thrust. This powerful magnetic thrust enables the anti-shake power unit to drive the main housing 110 to move more quickly and precisely in the plane perpendicular to the optical axis direction when meeting the anti-shake requirements of the main housing 110, effectively compensating for the displacement deviation caused by external vibrations, and thus significantly enhancing the effect of optical image stabilization and providing users with a more stable and clear imaging experience.

[0072] In this embodiment, the X-axis drive coil 322 and the Y-axis drive coil 332 are planar printed coils, including multi-layer spiral windings formed on a flexible circuit board.

[0073] In terms of manufacturing process, the planar printed coil utilizes printed circuit board technology to simplify the manufacturing process and reduce the labor and time costs. Its high-precision printing ensures dimensional accuracy and consistency, improves the yield rate, reduces the production cost, and enhances the price competitiveness of the product. In terms of space utilization, the flat structure of the planar printed coil saves axial space, which is conducive to the compact integration of the optical focusing module 100. It achieves a large inductance value within a limited plane, and the flexible circuit board can be flexibly arranged to optimize space utilization and promote the miniaturization and integration of the device. In terms of electrical performance, the multi-layer structure increases the number of turns, improves the inductance value, and enhances the driving force. At the same time, the distributed capacitance is small, which improves the high-frequency response performance, enables the anti-shake drive to be faster and more accurate, and ensures the imaging quality. In terms of reliability and stability, the combination of the planar printed coil and the flexible circuit board has good mechanical stability and anti-vibration performance. The flexible circuit board buffers stress, the printed connection is firm, reduces the risk of failure, and ensures the long-term stable operation of the module.

[0074] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical focusing module (100), characterized in that: include A main housing (110) and a movable housing (120), wherein the main housing (110) and the movable housing (120) are arranged opposite to each other along the optical axis direction; A fixed mirror group (130), comprising at least two optical lenses, rigidly fixed in the optical axis channel of the main housing (110); A movable mirror group (140), comprising at least two optical lenses, rigidly fixed in the optical axis channel of the movable housing (120); At least two guide pillars (150) parallel to the optical axis direction are mounted on the main housing (110) and form a sliding fit with the movable housing (120); The focusing power unit (160) drives the movable housing (120) to move along the axial direction of the guide column (150) to achieve an internal focusing operation.

2. The optical focusing module (100) according to claim 1, characterized in that: The focus power unit (160) comprises a Z-axis driving coil (161) fixed to the inner wall of the main housing (110) and one or more Z-axis magnets (162) fixed to the outer wall of the movable housing (120).

3. A driving device, characterized in that: It comprises the optical focusing module (100) as claimed in claim 1 or 2.

4. The driving device according to claim 3, characterized in that: Also includes The housing assembly (200) comprises an outer cover (210) and an upper cover (220) fixed to an upper opening of the outer cover (210); The flip-chip anti-shake module (300) comprises A plurality of suspension wires (310) for suspending the main housing (110) on the lower surface of the upper cover (220); The anti-shake power unit is configured to drive the main housing (110) to move below the upper cover (220) in a plane perpendicular to the optical axis direction.

5. The driving device according to claim 4, characterized in that: Also included is a ship-type prism assembly (400), which includes: An optical prism (410) having a trapezoidal cross section, wherein an incident surface and an exit surface of the optical prism (410) form a light path turning angle of 180°±1°; A first avoidance groove (111) is provided on the side wall of the main housing (110), a second avoidance groove (121) is provided at a corresponding position of the movable housing (120), and a third avoidance groove (211) is provided on the side wall of the outer cover (210); The first (111), second (121), and third (211) avoidance grooves cooperate to form a receiving space, and a portion of the optical prism (410) is embedded in the receiving space.

6. The driving device according to claim 5, characterized in that: The guide column (150), the Z-axis driving coil (161) and the Z-axis magnet (162) are arranged in a side area of ​​the accommodation space along the optical axis direction, and on a horizontal projection plane, the guide column (150), the Z-axis driving coil (161) and the Z-axis magnet (162) have no overlapping area with the accommodation space.

7. The driving device according to claim 4, characterized in that: The anti-shake power unit includes An X-axis drive unit (320) comprises an X-axis drive coil (322) fixed to the lower surface of the upper cover (220), and an X-axis magnet group (321) fixed to the top of the main housing (110), wherein the X-axis magnet group (321) comprises at least three permanent magnets arranged in a Halbach array, and the magnetization directions of the magnets are rotated by 90° in sequence; A Y-axis drive unit (330) comprises a Y-axis drive coil (332) fixed to the lower surface of the upper cover (220), and a Y-axis magnet group (331) fixed to the top of the main housing (110); the Y-axis magnet group (331) comprises at least three permanent magnets arranged in a Halbach array, and the magnetization directions of the magnets are rotated by 90° in sequence; The X-axis magnet group (321) and the Y-axis magnet group (331) are arranged orthogonally in a top-view projection plane, and both are located in the same side half of the main housing (110).

8. The driving device according to claim 7, characterized in that: The X-axis driving coil (322) and the Y-axis driving coil (332) are planar printed coils, including multi-layer spiral windings formed on a flexible circuit board.

9. A camera, characterized in that: Comprising a driving device as described in any one of claims 3-8.

10. An electronic device, characterized in that: Comprising the camera as claimed in claim 9.

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