Optical focusing module, driving device, camera and electronic equipment

Abstract

The utility model relates to an optical focusing module, a driving device, a camera and an electronic device, 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 an 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, focusing operation is carried out by adopting an inner focusing mode, and an accurate automatic focusing function can be achieved, so that the optical quality is further optimized and improved.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging technology, specifically to an internal focusing optical module with a guide post mechanism, which is particularly suitable for high-precision autofocus camera lenses, industrial testing equipment, and medical imaging instruments. By optimizing the mechanical structure and focusing method, it improves imaging stability and focusing efficiency. Background Technology

[0002] Traditional focusing modules often employ external or mounted designs. With external focusing, the entire lens assembly needs to move, resulting in a significant change in lens length. On one hand, such a substantial change in lens length easily induces vibration, severely impacting image stability. On the other hand, frequent extension and retraction greatly increases the likelihood of dust entering the lens. Once dust enters, it compromises the lens's seal, ultimately negatively affecting image quality. Utility Model Content

[0003] In view of this, the present invention provides an optical focusing module that achieves accurate autofocus by using an internal focusing method, thereby further optimizing and improving optical quality.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] 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, and a focusing power unit. The main housing and the movable housing are arranged opposite to each other along the optical axis. The fixed lens group includes at least two optical lenses and is rigidly fixed within the optical axis channel of the main housing. The movable lens group includes at least two optical lenses and is rigidly fixed within the optical axis channel of the movable housing. The guide posts are mounted 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 achieve internal focusing operation.

[0006] As a key guiding mechanism in this optical focusing module, the guide post possesses significant and undeniable advantages. From a mechanical structural perspective, it effectively maintains a highly precise perpendicularity between the movable housing and the main housing throughout the focusing process. This characteristic is crucial for ensuring the accurate propagation of light along the preset optical axis, as any slight deviation in perpendicularity can cause a shift in the light propagation path, thereby affecting the sharpness and accuracy of the image.

[0007] Meanwhile, the guide post plays a crucial role in ensuring stability during movement. When the focusing power unit drives the movable housing to move along the guide post's axis, the guide post, with its rigid structure and well-designed sliding fit with the movable housing, significantly reduces instability factors such as shaking and jitter that occur during movement. This stable movement is crucial for achieving precise focusing.

[0008] Furthermore, this optical focusing module employs an internal focusing method, where a focusing power unit moves a movable lens group relative to a fixed lens group along the optical axis to complete the focusing process. Compared to other focusing methods, internal focusing more effectively reduces changes in the overall lens size, avoiding interference from dust, moisture, and other factors that might be introduced due to frequent expansion and contraction of the lens's external structure, thus improving the lens's sealing and durability. Moreover, internal focusing significantly improves focusing speed and accuracy, allowing the lens to quickly and accurately adjust the focal length when facing subjects at different distances, achieving precise autofocus. This not only greatly improves shooting efficiency but also further enhances optical image quality, providing users with clearer, sharper, and more realistic images, meeting the stringent requirements for high-quality imaging in various professional and everyday shooting scenarios.

[0009] Preferably, the focusing power unit includes a Z-axis drive coil fixed to the inner wall of the main housing and one or more Z-axis magnets fixed to the outer wall of the movable housing.

[0010] Internal focusing allows the movable lens group to move only within the lens during focusing, eliminating the need for significant extension and retraction of the entire external lens structure as required by external focusing methods. This fundamentally limits the mass of the movable parts, enabling the movable housing to be as lightweight as possible while meeting optical performance requirements. A lighter movable housing has lower inertia, meaning that faster and more precise position adjustments can be achieved with less driving force during focusing, effectively improving focusing speed and accuracy.

[0011] Meanwhile, the excellent guiding stability provided by the guide pillars plays a crucial role. Thanks to their high-precision manufacturing process and rational layout design, the guide pillars provide a stable and accurate guiding path for the movable housing as it moves axially. This stability not only ensures the straightness and perpendicularity of the movable housing during movement, effectively avoiding focusing errors caused by shaking or offset, but also makes the entire focusing process smoother and more fluid, greatly improving the reliability and durability of the optical focusing module.

[0012] Based on the key factors of its lightweight movable housing and excellent guide post stability, this focusing power unit only requires one set of coil magnets on one side to achieve stable focusing operation. This simple and efficient design has several outstanding advantages. From a cost control perspective, reducing the number of coil magnets directly lowers raw material procurement costs and assembly costs during manufacturing, effectively improving the product's economic efficiency. From a structural design perspective, the simplified drive structure reduces the number of unnecessary parts, making the internal space layout of the entire optical focusing module more compact and rational. This facilitates improved product integration and miniaturization, better meeting the demands of modern optical equipment for thinner and more portable designs. Furthermore, the single-sided coil magnet design reduces system complexity, minimizes potential failure points, improves product stability and reliability, lowers after-sales maintenance costs, and further enhances the product's competitiveness in the market.

[0013] Another implementation of this utility model is a driving device, including the optical focusing module as described above.

[0014] By integrating the optical focusing module into the drive unit, a high degree of synergy and optimized integration among various components is achieved. With its advanced internal focusing method, stable guide pillar structure, and efficient focusing power unit, the optical focusing module provides the drive unit with accurate and reliable focusing capabilities. The advantages of internal focusing, such as reduced lens size changes and improved focusing speed and accuracy, enable the drive unit to better adapt to diverse working environments and task requirements.

[0015] Preferably, it also includes a housing assembly and an inverted anti-shake module. The housing assembly includes an outer cover and a top cover fixed to the upper opening of the outer cover. The inverted anti-shake module includes multiple suspension wires and an anti-shake power unit. The multiple suspension wires suspend the main housing on the lower surface of the top cover. The anti-shake power unit is configured to drive the main housing to move in a plane perpendicular to the optical axis below the top cover.

[0016] The inverted image stabilization module employs a unique inverted structural design, with multiple suspension wires suspending the main housing from the lower surface of the top cover. This layout results in a smaller distance ΔZ between the center of mass of the optical focusing module and the thrust center of the image stabilization power unit along the optical axis compared to conventional upright image stabilization modules. A deeper analysis from the perspectives of physics and engineering mechanics reveals the significant importance of this reduced distance.

[0017] During image stabilization, the image stabilization power unit applies thrust to drive the main housing to move in a plane perpendicular to the optical axis below the top cover, thus achieving image stabilization. A smaller spacing ΔZ significantly reduces the adverse effects of the stabilization thrust. Most importantly, it effectively reduces the lens tilt mode caused by the OIS (Optical Image Stabilization) thrust. Lens tilt causes deviations in the light propagation path, severely affecting image quality and causing blurring and distortion. By reducing the spacing ΔZ, the possibility of lens tilt is reduced, ensuring that light propagates more accurately along the preset path, greatly improving image sharpness and accuracy.

[0018] Furthermore, a smaller spacing ΔZ plays a decisive role in improving the control bandwidth. Control bandwidth is a crucial parameter in optical image stabilization systems, directly affecting the system's response to vibrations of different frequencies. A larger control bandwidth means the stabilization system can compensate for various vibrations more quickly and accurately, thus maintaining good stabilization performance even in more complex vibration environments. The inverted image stabilization module effectively improves the control bandwidth by optimizing the distance between the center of mass and the center of thrust. This allows the optical focusing module to respond quickly to different vibration frequencies and amplitudes, adjusting the position of the main housing in a timely manner to achieve efficient and stable image stabilization.

[0019] Preferably, it also includes a ship-shaped prism assembly, which includes an optical prism with a trapezoidal cross-section, a first clearance groove provided on the side wall of the main hull, a second clearance groove provided at a corresponding position on the movable hull, and a third clearance 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 clearance grooves cooperate to form a receiving space, and the optical prism is partially embedded in the receiving space.

[0020] The introduction of trapezoidal cross-section optical prisms (ship-shaped prisms) and their associated clearance groove design, through ingenious spatial layout and precise optical design, has successfully reduced the overall height of the drive unit, optimized optical performance, and improved the applicability and market competitiveness of the product, providing new ideas and directions for the development of optical focusing technology.

[0021] From the perspective of overall structural layout and space utilization, the introduction of the ship-shaped prism assembly aims to achieve efficient integration and optimization of the overall space, thereby achieving the key goal of reducing the overall height of the drive unit. In traditional optical equipment design, ship-shaped prisms are usually placed outside the drive unit, which undoubtedly increases the overall height of the equipment and is not conducive to the development of miniaturization and thinning. This utility model innovatively attempts to cleverly insert the ship-shaped prism into the drive unit, and successfully solves the space layout problem by making openings on the optical path side of the drive unit components to avoid obstruction.

[0022] Specifically, the first clearance groove on the side wall of the main housing, the second clearance groove on the corresponding position of the movable housing, and the third clearance groove on the side wall of the outer casing work together to form a receiving space, allowing the optical prism to be precisely embedded within this space. This design not only makes full use of internal space that might otherwise be wasted, but also, through rational layout planning, makes the spatial relationship between the various components more compact and orderly. Compared to traditional designs, the overall height of the drive unit is significantly reduced, which is crucial for meeting the stringent requirements of miniaturization and integration in modern optical equipment.

[0023] From the perspective of product applicability and market competitiveness, the reduced overall height of the drive unit allows this optical focusing module to be better adapted to various optical devices with strict space constraints. Whether in portable electronic devices such as smartphones and tablets, or in professional optical instruments sensitive to device size and weight, this module stands out with its compact design and excellent optical performance. This high degree of applicability not only broadens the product's application areas but also greatly enhances its market competitiveness, providing strong support for meeting the diverse needs of different customer groups.

[0024] Preferably, the guide post, Z-axis drive coil, and Z-axis magnet are arranged in the side region of the accommodating space along the optical axis, and on the horizontal projection plane, the guide post, Z-axis drive coil, and Z-axis magnet have no overlapping area with the accommodating space.

[0025] If the guide posts, Z-axis drive coils, and Z-axis magnets are not arranged in such a reasonable manner, but are placed randomly or overlap with the housing space, these components will inevitably occupy space resources in the overall height direction of the drive device. Since drive devices are often subject to strict space constraints in practical applications, especially in terms of height, excessive height space occupied by these critical components will directly increase the overall height of the drive device. Increased drive device height can lead to a series of negative effects. First, during equipment integration, an excessively tall drive device may not be compatible with certain optical devices with stringent space requirements, limiting the product's application range and compatibility. Second, a tall drive device may compromise the compactness and coordination of the entire optical system, increasing the overall size and weight of the device, which contradicts the current trend of miniaturization and lightweight optical equipment. The layout method adopted in this invention effectively avoids these problems. By precisely planning the positions of the guide posts, Z-axis drive coils, and Z-axis magnets to avoid clashing with the housing space, the space occupied by the drive device in the height direction is saved to the greatest extent possible while ensuring the normal functioning of each component. This not only helps maintain the compact structure of the drive unit, enabling it to better adapt to various complex application environments, but also provides strong support for the miniaturization and integration of optical equipment, significantly enhancing the product's competitiveness in the market.

[0026] 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 consists of at least three permanent magnets arranged in a Halbach array, with the magnetization direction of each magnet rotated by 90° sequentially. 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 consists of at least three permanent magnets arranged in a Halbach array, with the magnetization direction of each magnet rotated by 90° sequentially. 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 half of the main housing.

[0027] This invention employs a unilateral thrust design concept. By precisely planning the direction and range of magnetic force, it effectively concentrates magnetic field energy and significantly reduces magnetic leakage. This not only improves the utilization rate of magnetic field energy, enabling the image stabilization power unit to generate greater driving force while consuming the same amount of electrical energy, thus enhancing energy efficiency, but also reduces electromagnetic interference to the surrounding environment, strengthening the stability and anti-interference capabilities of the entire system. This ensures that the optical focusing module and related equipment can operate efficiently in a stable electromagnetic environment.

[0028] The Halbach magnetic array plays a crucial role in enhancing magnetic thrust. A Halbach magnetic array is a special arrangement of permanent magnets. By arranging at least three permanent magnets according to a specific pattern, with each magnet's magnetization direction rotated sequentially by 90°, a strong magnetic field is generated in a specific direction, significantly increasing magnetic thrust. Compared to traditional permanent magnet arrangements, the Halbach magnetic array can generate several times, or even more, magnetic thrust with the same number and volume of permanent magnets. This powerful magnetic thrust allows the image stabilization unit to drive the main housing more quickly and precisely in a plane perpendicular to the optical axis when addressing the stabilization requirements of the main housing. This effectively compensates for displacement deviations caused by external vibrations, significantly improving the optical image stabilization effect and providing users with a more stable and clearer imaging experience.

[0029] 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.

[0030] 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 yield, reduces production costs, and enhances product price competitiveness. Regarding space utilization, the flat structure of the planar printed coil saves axial space, facilitating the compact integration of optical focusing modules. It achieves a large inductance value within a limited plane, and the flexible circuit board allows for flexible arrangement, optimizing space utilization and promoting equipment miniaturization and integration. In terms of electrical performance, the multi-layer structure increases the number of turns, improves the inductance value, and enhances the driving force. Simultaneously, the low distributed capacitance improves high-frequency response performance, making image stabilization drive faster and more accurate, ensuring image quality. Regarding reliability and stability, the combination of planar printed coils and flexible circuit boards provides excellent mechanical stability and vibration resistance. The flexible circuit board buffers stress, and the printed connections are robust, reducing the risk of failure and ensuring long-term stable operation of the module.

[0031] Another implementation of this utility model is a camera, including the driving device described above.

[0032] Another implementation of this utility model is an electronic device, including the camera described above.

[0033] The advantages of this utility model compared to the prior art are:

[0034] The optical focusing module of this invention utilizes a guide post as a key guiding mechanism, possessing significant and undeniable advantages. From a mechanical structural principle perspective, it effectively maintains a highly precise perpendicularity between the movable housing and the main housing throughout the focusing process. This characteristic is crucial for ensuring the accurate propagation of light along the preset optical axis, as any minute deviation in perpendicularity can cause a shift in the light propagation path, thereby affecting the sharpness and accuracy of the image.

[0035] Meanwhile, the guide post plays a crucial role in ensuring stability during movement. When the focusing power unit drives the movable housing to move along the guide post's axis, the guide post, with its rigid structure and well-designed sliding fit with the movable housing, significantly reduces instability factors such as shaking and jitter that occur during movement. This stable movement is crucial for achieving precise focusing.

[0036] Furthermore, this optical focusing module employs an internal focusing method, where a focusing power unit moves a movable lens group relative to a fixed lens group along the optical axis to complete the focusing process. Compared to other focusing methods, internal focusing more effectively reduces changes in the overall lens size, avoiding interference from dust, moisture, and other factors that might be introduced due to frequent expansion and contraction of the lens's external structure, thus improving the lens's sealing and durability. Moreover, internal focusing significantly improves focusing speed and accuracy, allowing the lens to quickly and accurately adjust the focal length when facing subjects at different distances, achieving precise autofocus. This not only greatly improves shooting efficiency but also further enhances optical image quality, providing users with clearer, sharper, and more realistic images, meeting the stringent requirements for high-quality imaging in various professional and everyday shooting scenarios. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is an exploded view of a driving device according to an embodiment of the present invention.

[0039] Figure 2 This is an exploded view of the driving device according to another embodiment of the present invention.

[0040] Figure 3 This is an exploded view of an optical focusing module according to an embodiment of the present invention.

[0041] Figure 4 This is a structural diagram of a driving device according to an embodiment of the present invention.

[0042] Figure 5 This is a partial structural diagram of a driving device according to an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of the light path of a driving device according to an embodiment of the present invention.

[0044] Figure 7 This is a schematic diagram of an embodiment ΔZ of the present invention.

[0045] Figure 8 This is a schematic diagram of three permanent magnets arranged in a Halbach array according to an embodiment of the present invention.

[0046] Label Explanation

[0047] 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), top cover (220), inverted image stabilization 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 clearance slot (111), second clearance slot (121), third clearance slot (211). Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0050] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, 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 this application, it should be understood that the terms "upper," "lower," "left," "right," "vertical," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship commonly used when the product of this application is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0052] The technical solutions in this application will now be described with reference to the accompanying drawings.

[0053] 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, and a focusing power unit 160. The main housing 110 and the movable housing 120 are arranged opposite to each other along the optical axis. 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 along the axial direction of the guide posts 150 to achieve internal focusing operation.

[0054] The guide post 150, as a key guiding mechanism in the optical focusing module 100, possesses significant and undeniable advantages. From a mechanical structure perspective, it effectively maintains a highly precise perpendicularity between the movable housing 120 and the main housing 110 throughout the focusing process. This characteristic is crucial for ensuring the accurate propagation of light along the preset optical axis, as any slight deviation in perpendicularity can cause a shift in the light propagation path, thereby affecting the sharpness and accuracy of the image.

[0055] Meanwhile, the guide post 150 plays a crucial role in ensuring stability during movement. 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 well-designed sliding fit with the movable housing 120, can greatly reduce unstable factors such as shaking and jittering of the movable housing 120 during movement. This stable movement is crucial for achieving precise focusing.

[0056] Furthermore, this optical focusing module 100 employs an internal focusing method, whereby the focusing power unit 160 moves the movable lens group 140 relative to the fixed lens group 130 along the optical axis to complete the focusing process. Compared to other focusing methods, internal focusing more effectively reduces changes in the overall size of the lens, avoiding interference factors such as dust and moisture that may be introduced due to frequent expansion and contraction of the lens's external structure, thereby improving the lens's sealing and durability. Moreover, internal focusing significantly improves focusing speed and accuracy, allowing the lens to quickly and accurately adjust the focal length when facing subjects at different distances, achieving precise autofocus. This not only greatly improves shooting efficiency but also further enhances optical imaging quality, providing users with clearer, sharper, and more realistic image effects, meeting the stringent requirements for high-quality imaging in various professional and everyday shooting scenarios.

[0057] In this embodiment, the focusing power unit 160 includes a Z-axis drive 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.

[0058] The internal focusing method allows the movable lens group 140 to only move relatively within the lens during focusing, eliminating the need for significant extension and retraction of the entire external lens structure as required by external focusing methods. This characteristic fundamentally limits the mass of the movable parts, allowing the movable housing 120 to be as lightweight as possible while meeting optical performance requirements. The lighter movable housing 120 has lower inertia at the physical level, meaning that faster and more precise position adjustments can be achieved with less driving force during focusing, thereby effectively improving focusing speed and accuracy.

[0059] Meanwhile, the excellent guiding stability provided by the guide post 150 plays a crucial role. Thanks to its high-precision machining and rational layout design, the guide post 150 provides a stable and accurate guiding path for the movable housing 120 as it moves axially. This stability not only ensures the straightness and perpendicularity of the movable housing 120 during movement, effectively avoiding focusing errors caused by shaking or offset, but also makes the entire focusing process smoother and more fluid, greatly improving the reliability and durability of the optical focusing module 100.

[0060] Based on the key factors of the lightweight movable housing 120 and the excellent guiding stability of the guide post 150, this focusing power unit 160 only needs to set one set of coil magnets on one side to achieve stable focusing operation. This simple and efficient design has several outstanding advantages. From a cost control perspective, reducing the number of coil magnets directly reduces raw material procurement costs and assembly costs in the manufacturing process, effectively improving the product's economic efficiency. From a structural design perspective, the simplified drive structure reduces the number of unnecessary parts, making the internal space layout of the entire optical focusing module 100 more compact and reasonable, which is conducive to improving the product's integration and miniaturization, thereby better meeting the development needs of modern optical equipment for lightness, thinness, and portability. In addition, the design of setting one set 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 after-sales maintenance costs, and further enhances the product's competitiveness in the market.

[0061] In this embodiment, the driving device further includes a housing assembly 200 and an inverted anti-shake module 300. The housing assembly 200 includes an outer cover 210 and an upper cover 220 fixed to the upper opening of the outer cover 210. The inverted anti-shake module 300 includes multiple suspension wires 310 and an anti-shake power unit. The multiple suspension wires 310 suspend 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 in a plane perpendicular to the optical axis below the upper cover 220.

[0062] The inverted image stabilization module 300 employs a unique inverted structural design, with multiple suspension wires 310 suspending the main housing 110 from the lower surface of the upper cover 220. This layout results in a smaller distance ΔZ between the center of mass of the optical focusing module 100 and the thrust center of the image stabilization power unit along the optical axis compared to conventional upright image stabilization modules. A deeper analysis from the perspectives of physics and engineering mechanics reveals the significant importance of this reduced distance.

[0063] During image stabilization, the image stabilization power unit applies thrust to drive the main housing 110 to move in a plane perpendicular to the optical axis below the top cover 220, thereby achieving image stabilization. A smaller spacing ΔZ significantly reduces the adverse effects of the stabilization thrust. Most importantly, it effectively reduces the lens tilt mode caused by the OIS (Optical Image Stabilization) thrust. Lens tilt causes deviations in the light propagation path, severely affecting image quality and causing blurring and distortion. By reducing the spacing ΔZ, the possibility of lens tilt is reduced, ensuring that light propagates more accurately along the preset path, greatly improving image sharpness and accuracy.

[0064] Furthermore, a smaller spacing ΔZ plays a decisive role in improving the control bandwidth. Control bandwidth is a crucial parameter in optical image stabilization systems, directly affecting the system's response to vibrations of different frequencies. A larger control bandwidth means the stabilization system can compensate for various vibrations more quickly and accurately, thus maintaining good image stabilization performance even in more complex vibration environments. The inverted image stabilization 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 respond quickly to different vibration frequencies and amplitudes, promptly adjusting the position of the main housing 110 to achieve efficient and stable image stabilization.

[0065] In this embodiment, a ship-shaped prism assembly 400 is also included, which includes an optical prism 410 with a trapezoidal cross section, a first clearance groove 111 provided on the side wall of the main housing 110, a second clearance groove 121 provided at a corresponding position on the movable housing 120, and a third clearance 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, the second 121, and the third 211 clearance grooves cooperate to form a receiving space, and the optical prism 410 is partially embedded in the receiving space.

[0066] The introduction of the trapezoidal cross-section optical prism 410 (ship-shaped prism) and its associated clearance groove design, through ingenious spatial layout and precise optical design, has successfully reduced the overall height of the drive unit, optimized optical performance, and improved the applicability and market competitiveness of the product, providing new ideas and directions for the development of optical focusing technology.

[0067] From the perspective of overall structural layout and space utilization, the introduction of the ship-shaped prism assembly 400 aims to achieve efficient integration and optimization of the overall space, thereby achieving the key goal of reducing the overall height of the drive unit. In traditional optical equipment design, ship-shaped prisms are usually placed outside the drive unit, which undoubtedly increases the overall height of the equipment and is not conducive to the development of miniaturization and thinning. This utility model innovatively attempts to cleverly insert the ship-shaped prism into the drive unit, and successfully solves the space layout problem by making openings on the optical path side of the drive unit components to avoid obstruction.

[0068] Specifically, the first clearance groove 111 on the side wall of the main housing 110, the second clearance groove 121 on the corresponding position of the movable housing 120, and the third clearance groove 211 on the side wall of the outer cover 210 work together to form a receiving space, in which a portion of the optical prism 410 can be precisely embedded. This design 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 the various components more compact and orderly. Compared with traditional designs, the overall height of the drive device is significantly reduced, which is of vital importance for meeting the stringent requirements of modern optical equipment for miniaturization and integration.

[0069] From the perspective of product applicability and market competitiveness, the reduced overall height of the drive unit allows this optical focusing module 100 to be better adapted to various optical devices with strict space constraints. Whether in portable electronic devices such as smartphones and tablets, or in professional optical instruments sensitive to device size and weight, this module stands out with its compact design and excellent optical performance. This high degree of applicability not only broadens the product's application areas but also greatly enhances its market competitiveness, providing strong support for meeting the diverse needs of different customer groups.

[0070] In this embodiment, the guide post 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 there is no overlap between the guide post 150, the Z-axis drive coil 161, and the Z-axis magnet 162 and the accommodating space on the horizontal projection plane.

[0071] If the guide post 150, Z-axis drive coil 161, and Z-axis magnet 162 are not arranged in such a reasonable manner, but are placed randomly or overlap with the accommodating space, these components will inevitably occupy space resources in the overall height direction of the drive device. Since drive devices are often subject to strict space constraints in practical applications, especially in terms of height, excessive height space occupied by these critical components will directly increase the overall height of the drive device. This increase in height can lead to a series of negative effects. First, during equipment integration, an excessively tall drive device may not be compatible with certain optical devices with stringent space requirements, limiting the product's application range and compatibility. Second, a taller drive device may compromise the compactness and coordination of the entire optical system, increasing the overall size and weight of the device, which contradicts the current trend of miniaturization and lightweight optical equipment. The layout method adopted in this invention effectively avoids the above problems. By precisely planning the positions of the guide post 150, Z-axis drive coil 161, and Z-axis magnet 162 to avoid their placement within the housing space, the space occupied by the drive unit in the height direction is minimized while ensuring the normal functioning of each component. This not only helps maintain the compact structure of the drive unit, enabling it to better adapt to various complex application environments, but also provides strong support for the miniaturization and integration of optical equipment, significantly enhancing the product's competitiveness in the market.

[0072] 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 (the original text is incorrect; it should be the upper cover 220) and an X-axis magnet assembly 321 fixed to the top of the main housing 110. The X-axis magnet assembly 321 consists of at least three permanent magnets arranged in a Halbach array, with the magnetization direction of each magnet rotated sequentially by 90°. The Y-axis drive unit 330 includes an X-axis drive coil 322 fixed to the lower surface of the outer cover (the original text is incorrect; it should be the upper cover 220). The Y-axis drive coil 332 on the lower surface and the Y-axis magnet group 331 fixed to the top of the main housing 110. The Y-axis magnet group 331 consists of at least three permanent magnets arranged in a Halbach array, with the magnetization direction of each magnet rotated 90° in sequence. The X-axis magnet group 321 and the Y-axis magnet group 331 are orthogonally arranged in the top projection plane, and both are located in the same half of the main housing 110.

[0073] This invention employs a unilateral thrust design concept. By precisely planning the direction and range of magnetic force, it effectively concentrates magnetic field energy and significantly reduces magnetic leakage. This not only improves the utilization rate of magnetic field energy, enabling the image stabilization power unit to generate greater driving force while consuming the same amount of electrical energy, thus enhancing energy efficiency, but also reduces electromagnetic interference to the surrounding environment, strengthens the stability and anti-interference capability of the entire system, and ensures that the optical focusing module 100 and related equipment can operate efficiently in a stable electromagnetic environment.

[0074] The Halbach magnetic array plays a crucial role in enhancing magnetic thrust. A Halbach magnetic array is a special arrangement of permanent magnets. By arranging at least three permanent magnets according to a specific pattern, with each magnet's magnetization direction rotated sequentially by 90°, a strong magnetic field is generated in a specific direction, significantly increasing magnetic thrust. Compared to traditional permanent magnet arrangements, the Halbach magnetic array can generate several times, or even more, magnetic thrust under the same number and volume of permanent magnets. This powerful magnetic thrust allows the image stabilization power unit to drive the main housing 110 more quickly and accurately in a plane perpendicular to the optical axis when meeting the image stabilization requirements of the main housing 110. This effectively compensates for displacement deviations caused by external vibrations, thus significantly improving the optical image stabilization effect and providing users with a more stable and clear imaging experience.

[0075] 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.

[0076] In terms of manufacturing process, the planar printed coil utilizes printed circuit board technology to simplify the manufacturing process and reduce labor and time costs. Its high-precision printing ensures dimensional accuracy and consistency, improves yield, reduces production costs, and enhances product price competitiveness. Regarding space utilization, the flat structure of the planar printed coil saves axial space, facilitating the compact integration of the optical focusing module 100. It achieves a large inductance value within a limited plane, and the flexible circuit board allows for flexible arrangement, optimizing space utilization and promoting device miniaturization and integration. In terms of electrical performance, the multi-layer structure increases the number of turns, improves the inductance value, and enhances the driving force. Simultaneously, the low distributed capacitance improves high-frequency response performance, making image stabilization drive faster and more accurate, ensuring image quality. Regarding reliability and stability, the combination of the planar printed coil and the flexible circuit board provides excellent mechanical stability and vibration resistance. The flexible circuit board buffers stress, and the printed connections are robust, reducing the risk of failure and ensuring long-term stable operation of the module.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An optical focusing module (100), characterized in that, The optical focusing module (100) comprises a main housing (110) and a movable housing (120), the main housing (110) and the movable housing (120) are arranged opposite along the optical axis direction; The fixed lens group (130) comprises at least two optical lenses, which are rigidly fixed in the optical axis channel of the main housing (110); The movable lens group (140) comprises at least two optical lenses, which are rigidly fixed in the optical axis channel of the movable housing (120); At least two guide columns (150) parallel to the optical axis direction 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 along the guide column (150) to realize the internal focusing operation. The focusing power unit (160) comprises 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).

2. The optical focusing module (100) according to claim 1, characterized in that, The optical focusing module (100) comprises the optical focusing module (100) according to claim 1 or 2.

3. A drive device characterized by comprising: Further comprising 4. The drive apparatus according to claim 3, characterized by The shell assembly (200) comprises a cover (210) and an upper cover (220) fixed to the upper end opening of the cover (210); The inverted anti-shake module (300) comprises A plurality of suspension wires (310) suspend the main housing (110) from the lower surface of the upper cover (220); The anti-shake power unit is configured to drive the main housing (110) to move in the plane perpendicular to the optical axis direction below the upper cover (220). Further comprising a prism assembly (400) comprising:

5. The drive apparatus according to claim 4, characterized by An optical prism (410) with a trapezoidal cross section, the entrance surface and the exit surface of the optical prism (410) forming an optical path turning angle of 180°±1°; A first avoiding groove (111) provided on the side wall of the main housing (110), a second avoiding groove (121) provided at the corresponding position of the movable housing (120), and a third avoiding groove (211) provided on the side wall of the cover (210); The first avoiding groove (111), the second avoiding groove (121), and the third avoiding groove (211) cooperate to form a containing space, and part of the optical prism (410) is embedded in the containing space. The guide column (150), the Z-axis drive coil (161), and the Z-axis magnet (162) are arranged in the side area of the containing space along the optical axis direction, and in 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 containing space.

6. The drive apparatus according to claim 5, characterized by The anti-shake power unit comprises 7. The drive apparatus according to claim 4, characterized by The 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), the X-axis magnet group (321) is arranged in a Halbach array by at least three permanent magnets, and the magnetization directions of the magnets are rotated by 90° in turn; ​ The Y-axis driving unit (330) comprises a Y-axis driving 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 shell (110), wherein the Y-axis magnet group (331) is arranged in a Halbach array by at least three permanent magnets, 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 the projection plane, and both are located in the same side half area of the main shell (110).

8. The drive apparatus according to claim 7, characterized by The X-axis driving coil (322) and the Y-axis driving coil (332) are planar printed coils, comprising a plurality of layers of spiral windings formed on a flexible circuit board.

9. A camera, characterized by The driving device as claimed in any one of claims 3-8.

10. An electronic device, comprising: The camera as claimed in claim 9.

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