A lens driving module and a camera

Abstract

This application relates to a lens driving module and a camera. The lens driving module includes a housing, a first frame, a second frame, and a lens carrier. The first frame is suspended above a base by a first elastic support, and the second frame is suspended within the first frame by a second elastic support. A frame driving assembly drives the first and second frames to move in a horizontal plane, so that the total displacement of the second frame is a superposition of two levels of displacement. The lens carrier is equipped with a focusing assembly that drives it to move along the optical axis. This application adopts a multi-level frame suspension structure, achieving large-stroke image stabilization through the superposition of elastic support deformation, breaking through the limitation of single-level suspension stroke; utilizing Z-axis multi-layer stacking reduces the plane occupation, which is beneficial for miniaturization; optimizing the layout of magnets and coils improves magnetic field utilization and anti-interference ability; integrating autofocus function and providing stable movement with high reliability, it is suitable for miniature camera modules.

Description

Technical Field

[0001] This application relates to the field of miniature camera module technology, specifically to a lens driving module and a camera. Background Technology

[0002] With the increasing prevalence of smartphones, drones, and wearable devices, the demand for miniature camera modules is growing. To improve image quality, camera modules typically need to have optical image stabilization (OIS) and autofocus (AF) functions.

[0003] Current mainstream camera image stabilization motor technologies include suspension cable solutions. These solutions use four suspension cables positioned at the four corners or sides of the motor to support the entire moving part, leaving it suspended in the air. When the coils are energized, they push the moving part to move in the X or Y direction.

[0004] However, this scheme has drawbacks. For example, the distance the mover travels in the X or Y direction depends not only on the magnet and coil but also on the thickness and length of the suspension wire. Due to limitations in the casing's dimensions, especially its height, the suspension wire cannot be made very long, which in turn limits its deformation. Excessive deformation leads to high stress on the wire, making it prone to breakage. Summary of the Invention

[0005] This application provides a lens driving module and camera that can solve the technical problem in the prior art where the length and deformation of the suspension line are limited by the size of the housing, which ultimately leads to limited shaking stroke.

[0006] In a first aspect, embodiments of this application provide a lens driving module, which includes: The housing includes a base and a top cover that fit together. The first frame is located inside the housing and its outer periphery is suspended above the base by a plurality of first elastic supports; The second frame is suspended within the first frame by multiple second elastic supports on its outer periphery, and a lens carrier is provided inside the second frame. A frame driving component configured to drive the first frame to move in a first horizontal plane parallel to the top surface of the base, and the second frame to move in a second horizontal plane parallel to the top surface of the base.

[0007] Preferably, the frame drive assembly includes a first magnet group and a first coil disposed opposite to each other, wherein the magnets of the first magnet group are arranged along a horizontal plane, and the end face of the first coil is parallel to the horizontal plane.

[0008] Preferably, the frame drive component is disposed between the first frame and the base; The number of frame driving components is two, and the projections of the two frame driving components are respectively located on one side or one corner of the base, and the two sides or two corners are perpendicular to each other; or, the number of frame driving components is four, and their projections are set one-to-one with the four sides or four corners of the base.

[0009] Preferably, the frame driving component is also provided between the first frame and the second frame; The number of frame driving components located between the first frame and the second frame is two, and the projections of the two frame driving components are respectively located on one side of the first frame, and the two sides are perpendicular to each other; or, the number of frame driving components is four, and their projections are set to correspond one-to-one with the four sides of the first frame.

[0010] Preferably, the first frame is provided with a mounting groove, and the first coil is disposed in the mounting groove; the first magnet group includes two groups, one group is mounted on the top surface of the base, and the other group is mounted on the bottom surface of the second frame; the first coil and the two first magnet groups are arranged vertically coaxially; or, The first frame is provided with a mounting groove, and the first magnet group is provided in the mounting groove; the first coil includes two, one of which is installed on the top surface of the base and the other is installed on the bottom surface of the second frame; the two first coils and the first magnet group are arranged vertically coaxially.

[0011] Preferably, a first vertical through groove is provided on one of the outer walls of the lens carrier that contacts the second frame; a second vertical through groove is provided on the inner wall of the second frame corresponding to the first vertical through groove; the first vertical through groove and the second vertical through groove form an installation space; The mounting space is equipped with a focusing component connected to the second frame; the focusing component is used to drive the lens carrier to move along the central axis of the lens.

[0012] Preferably, the focusing assembly includes a second magnet group and a second coil arranged opposite to each other, wherein the magnets of the second magnet group are stacked along a vertical plane, and the end face of the second coil is parallel to the vertical plane; The second coil is mounted on the second frame, and the second magnet group is mounted on the lens carrier; or, the second coil is mounted on the lens carrier, the second magnet group is mounted on the second frame, and the lens carrier and the second frame are electrically connected by a spring.

[0013] Preferably, a guide groove is provided between the lens carrier and the second frame, and on at least one side wall of the lens carrier, and a guide rod or multiple balls are provided in the guide groove.

[0014] Preferably, the outer periphery of the bottom of the second frame is provided with a skirt; the bottom end of the second elastic support is connected to the skirt, and the top end is connected to the top of the first frame; or, The bottom end of the second elastic support is connected to the inner bottom wall of the first frame, and the top end is connected to the top of the second frame.

[0015] Secondly, a camera is provided, comprising: Lens drive module; A position sensor, located inside the housing of the lens drive module, is used to detect the horizontal displacement of the first frame and the second frame; A control component is connected to the frame drive component of the lens drive module and the position sensor, respectively; the control component is configured to: receive signals from the position sensor and generate a stabilization compensation control signal in combination with a target command; and control the movement of the first frame and the second frame based on the stabilization compensation control signal.

[0016] The beneficial effects of the technical solutions provided in this application include: The two-stage suspension structure formed by the first and second frames, as well as the first and second elastic supports, makes the total displacement of the second frame relative to the base equal to the sum of the displacement of the first frame relative to the base and the displacement of the second frame relative to the first frame. Specifically, by changing the X-axis or Y-axis displacement from being determined by the deformation of a single elastic element to being determined by the deformation of two elastic elements, the cumulative deformation of multiple elastic elements can be obtained, thereby improving the total anti-shake displacement, i.e., achieving a larger anti-shake angle. This solves the problem of small stroke caused by the length limitation of single-stage suspension lines in the background technology. In addition, the multi-layer structure in the Z-axis allows for smaller X and Y dimensions, which is beneficial for module miniaturization. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the overall structure of the lens driving module provided in this application; Figure 2 An exploded view of the lens driving module provided in this application; Figure 3 Provided for this application Figure 1 A schematic diagram of the lens drive module without the top cover provided in the image; Figure 4 Provided for this application Figure 3 The lens drive module provided in the diagram further removes the three-dimensional structure diagram of the lens carrier; Figure 5 Provided for this application Figure 4 The provided lens drive module further removes the second frame in its three-dimensional structure diagram; Figure 6 Provided for this application Figure 5 The three-dimensional structure diagram of the lens driving module provided in the diagram further removes the first frame; Figure 7 A schematic diagram of the structure in the focusing assembly provided in this application, showing the second coil disposed on the lens carrier; Figure 8 The difference provided for this application is Figure 5 Another design form of the second elastic support member is shown in the image.

[0019] In the diagram: 1. Top cover; 2. Base; 3. First frame; 4. First elastic support; 5. Second frame; 6. Frame drive assembly; 600. First magnet group; 601. First coil; 7. Second elastic support; 8. Lens carrier; 9. Focusing assembly; 900. Second magnet group; 901. Second coil; 902. Guide rod. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0021] This application provides a lens driving module and camera, which adopts a multi-level frame suspension structure. Large-stroke image stabilization is achieved through the deformation superposition of multi-level elastic support components. The layout of magnets and coils is optimized to improve magnetic field utilization and anti-interference capability, as detailed below: Example 1 Please see Figures 1-3 A lens driving module, comprising: The housing includes a base 2 and a top cover 1 that fit together. The first frame 3 is located inside the shell and is suspended above the base 2 by a plurality of first elastic supports 4 on its outer periphery; The second frame 5 is suspended within the first frame 3 by multiple second elastic supports 7 on its outer periphery, and a lens carrier 8 is provided inside the second frame 5. The frame drive component 6 is configured to drive the first frame 3 to move in a first horizontal plane parallel to the top surface of the base 2, and the second frame 5 to move in a second horizontal plane parallel to the top surface of the base 2.

[0022] The two-stage suspension structure formed by the first frame 3 and the second frame 5, as well as the first elastic support 4 and the second elastic support 7, makes the total displacement of the second frame 5 relative to the base 2 equal to the sum of the displacement of the first frame 3 relative to the base 2 and the displacement of the second frame 5 relative to the first frame 3.

[0023] Specifically, the X- or Y-axis displacement is changed from being determined by the deformation of a single elastic element to being determined by the deformation of two elastic elements. The system can obtain the cumulative deformation of multiple elastic elements, thereby improving the total anti-shake displacement, i.e., achieving a larger anti-shake angle. This solves the problem of small stroke due to length limitations in single-stage suspension cables in the background technology. In addition, the multi-layer structure in the Z-axis allows for smaller X and Y dimensions, which is beneficial for module miniaturization.

[0024] Example 2 This embodiment further defines the specific structure and layout of the framework driving component 6 based on embodiment 1.

[0025] The frame drive assembly 6 includes a first magnet group 600 and a first coil 601 arranged opposite to each other. The magnets of the first magnet group 600 are arranged along a horizontal plane, and the end face of the first coil 601 is parallel to the horizontal plane. When energized, the first coil 601 experiences an Ampere force in the magnetic field of the first magnet group 600, which drives the frame to move horizontally.

[0026] Regarding the number and location of the framework driver component 6, there are several possible implementations: Format 1: A frame drive component 6 is disposed between the first frame 3 and the base 2; There are two frame drive components 6, and the projections of the two frame drive components 6 are located on one side of the base 2, and the two sides are perpendicular to each other; or, there are four frame drive components 6, and their projections are set to correspond one-to-one with the four sides of the base 2.

[0027] A frame driver component 6 is also set between the first frame 3 and the second frame 5. The number of frame driving components 6 located between the first frame 3 and the second frame 5 is two, and the projections of the two frame driving components 6 are respectively located on one side of the first frame 3, and the two sides are perpendicular to each other; or, the number of frame driving components 6 is four, and their projections are set to correspond one-to-one with the four sides of the first frame 3.

[0028] The side of Form 1 can be located at the corner of base 2. All other settings are the same, only the positions are different.

[0029] Form Two refer to Figures 4-6 The collinear coil shown has a mounting groove on the first frame 3, in which a first coil 601 is mounted; the first magnet group 600 includes two groups, one of which is mounted on the top surface of the base 2, and the other is mounted on the bottom surface of the second frame 5; the first coil 601 and the two first magnet groups 600 are vertically coaxial; or, The first frame 3 has a mounting slot, and the mounting slot contains a first magnet group 600. Two first coils 601 are included, one mounted on the top surface of the base 2 and the other mounted on the bottom surface of the second frame 5. The two first coils 601 and the first magnet group 600 are vertically coaxial. Furthermore, the upper and lower coils can be connected in series for synchronous operation or connected in parallel for independent operation.

[0030] The above form one is the basic form, but it suffers from structural complexity and high cost; form two is preferred. Form two enables the upper and lower first frames 3 and second frames 5 to share the frame drive component 6, improving the magnetic field utilization of the magnet and reducing power consumption.

[0031] Furthermore, in Form 2, the number of frame drive components 6 around the perimeter is preferably two, arranged perpendicularly to each other. Compared to the traditional four-sided magnet design, this results in a smaller magnetic field distribution range and stronger resistance to external magnetic interference.

[0032] Example 3 This embodiment, based on embodiment 1 or 2, further defines the focusing function of the lens carrier 8, referring to... Figures 5-7 As shown.

[0033] A first vertical through groove is provided on one of the outer walls of the lens carrier 8 that contacts the second frame 5; a second vertical through groove is provided on the inner wall of the second frame 5 corresponding to the first vertical through groove; the first vertical through groove and the second vertical through groove form an installation space; The mounting space is equipped with a focusing assembly 9 connected to the second frame 5; the focusing assembly 9 is used to drive the lens carrier 8 to move along the central axis of the lens.

[0034] Specifically, the focusing assembly 9 includes a second magnet group 900 and a second coil 901 arranged opposite to each other. The magnets of the second magnet group 900 are stacked along the vertical plane, and the end face of the second coil 901 is parallel to the vertical plane. Magnets on the carrier: The second coil 901 is mounted on the second frame 5, and the second magnet assembly 900 is mounted on the lens carrier 8; Reference Figure 6 As shown.

[0035] The coils on the carrier: The second coil 901 is mounted on the lens carrier 8, the second magnet group 900 is mounted on the second frame 5, and the lens carrier 8 and the second frame 5 are electrically connected via a spring contact. (Reference) Figure 7 As shown.

[0036] In addition, to ensure smooth movement, a guide groove is provided between the lens carrier 8 and the second frame 5, and on at least one side wall of the lens carrier 8, and a guide rod 902 or multiple balls are provided in the guide groove.

[0037] While achieving OIS image stabilization, the vertically stacked magnets and coils work together to enable precise movement of the lens carrier 8 along the optical axis, thus completing autofocus. Guide grooves, in conjunction with guide rods 902 or ball bearings, restrict the freedom of the lens carrier 8, ensuring it moves only along the optical axis and preventing tilting from affecting image formation. Furthermore, the two-stage suspension structure's z-axis design allows for efficient space utilization.

[0038] Example 4 This embodiment further defines the connection details of the second elastic support 7.

[0039] Option 1: A skirt is provided on the outer periphery of the bottom of the second frame 5; the bottom end of the second elastic support 7 is connected to the skirt, and the top end is connected to the top of the first frame 3, for reference. Figure 8 As shown.

[0040] Option 2: The bottom end of the second elastic support 7 is connected to the inner bottom wall of the first frame 3, and the top end is connected to the top of the second frame 5, as shown in the reference. Figures 6-7 As shown.

[0041] The above two methods can be selected according to actual needs. The connection design through the skirt or inner bottom wall ensures the suspension stability of the second frame 5 within the first frame 3, avoids collisions during movement, and the reasonable fixing point design helps to disperse the stress of the elastic support when it undergoes large deformation, reducing the risk of wire breakage.

[0042] Example 5 A camera, comprising: The lens drive module described above; A position sensor, located inside the housing of the lens drive module, is used to detect the horizontal displacement of the first frame 3 and the second frame 5. The control component is connected to the frame drive component 6 of the lens drive module and the position sensor respectively; the control component is configured to: receive signals from the position sensor and generate image stabilization compensation control signals in combination with target instructions; and control the movement of the first frame 3 and the second frame 5 based on the image stabilization compensation control signals.

[0043] The current in the coil is supplied by the elastic supports at the four corners or sides; in addition, there are electrical pins on the base that can be connected to the outside of the device.

[0044] By using position sensors to detect frame displacement in real time, the control components form a closed-loop feedback, which can more accurately compensate for hand tremors and improve anti-shake accuracy. The elastic support also serves as a power supply path, reducing additional wiring space and facilitating module miniaturization.

[0045] In summary, the beneficial effects of this application include: Significantly increasing the stabilization stroke and overcoming spatial limitations, this application employs a double-layer frame suspension structure. The first frame 3 is suspended above the base 2 via a first elastic support 4, and the second frame 5 is suspended within the first frame 3 via a second elastic support 7. This ensures that the total displacement of the second frame 5 relative to the base 2 is equal to the sum of the displacements of the first frame 3 relative to the base 2 and the second frame 5 relative to the first frame 3. This displacement superposition design overcomes the stroke bottleneck of traditional single-stage suspension motors limited by suspension length, stress, and module height, achieving a larger optical image stabilization (OIS) compensation angle without significantly increasing the module height.

[0046] The compact structure facilitates module miniaturization. This application utilizes the space along the Z-axis for a multi-layer stacking design, distributing the driving displacements in the X and Y directions across different frame levels. This layout effectively reduces the module's footprint in the XY plane, promoting the miniaturization and thinning of camera modules and adapting them to space-constrained applications such as smartphones and wearable devices.

[0047] The magnetic field utilization is high and the anti-interference capability is strong. This application optimizes the layout of the first magnet group 600 and the first coil 601 in the frame drive assembly 6. By adopting a design where the upper and lower coils share magnets or the magnets share coils, the magnetic field utilization is significantly improved, and the drive power consumption is expected to be reduced. In addition, through a specific magnet arrangement, such as two mutually perpendicular side settings, the magnetic field distribution range is more concentrated, reducing magnetic field leakage, thereby enhancing the module's ability to resist external magnetic interference and ensuring anti-shake stability.

[0048] The image stabilization and focusing functions are integrated, resulting in good motion stability. This application integrates a focusing component 9 within the second frame 5. The lens carrier 8 is driven to move along the optical axis (the lens's central axis) via a vertically stacked second magnet group 900 and a second coil 901. This design decouples horizontal image stabilization from vertical focusing, allowing for independent control without interference. Simultaneously, the guide design using guide grooves, guide rods 902, or ball bearings restricts the lens carrier 8's degrees of freedom, ensuring precise movement only along the optical axis and avoiding the impact of tilt on image quality.

[0049] Compared to traditional ball bearing solutions, this application uses a first elastic support 4 and a second elastic support 7 as suspension supports and conductive components, avoiding problems such as dust generation from movement friction and easy damage from drops. In particular, the design of having a skirt at the bottom of the second frame 5 or connecting the second elastic support 7 through the inner bottom wall ensures the suspension stability of the second frame 5 within the first frame 3, avoids collisions during movement, reduces the risk of wire breakage, and improves the reliability and lifespan of the product.

[0050] This application combines a position sensor and a control component to form a closed-loop control system. The position sensor detects the horizontal displacement signals of the first frame 3 and the second frame 5 in real time, and the control component generates an image stabilization compensation control signal accordingly. This closed-loop feedback mechanism can eliminate errors in open-loop control, significantly improving the accuracy, response speed, and environmental adaptability of image stabilization and focusing. At the same time, utilizing the elastic support as a power supply path reduces additional wiring space and further facilitates module miniaturization.

[0051] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0052] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A lens driving module, characterized in that, It includes: The housing includes a base (2) and a top cover (1) that fit together. The first frame (3) is located inside the housing and its outer periphery is suspended above the base (2) by a plurality of first elastic supports (4); The second frame (5) is suspended in the first frame (3) by multiple second elastic supports (7) on its outer periphery, and a lens carrier (8) is provided in the second frame (5). A frame drive assembly (6) is configured to drive the first frame (3) to move in a first horizontal plane parallel to the top surface of the base (2), and the second frame (5) to move in a second horizontal plane parallel to the top surface of the base (2).

2. The lens driving module as described in claim 1, characterized in that: The frame drive assembly (6) includes a first magnet group (600) and a first coil (601) arranged opposite to each other. The magnets of the first magnet group (600) are arranged along the horizontal plane, and the end face of the first coil (601) is parallel to the horizontal plane.

3. The lens driving module as described in claim 2, characterized in that: The frame drive component (6) is disposed between the first frame (3) and the base (2); The number of the frame drive components (6) is two, and the projections of the two frame drive components (6) are respectively located on one side or one corner of the base (2), and the two sides or two corners are perpendicular to each other; or, the number of the frame drive components (6) is four, and their projections are set one-to-one with the four sides or four corners of the base (2).

4. The lens driving module as described in claim 3, characterized in that: The frame driving component (6) is also provided between the first frame (3) and the second frame (5). The number of frame driving components (6) located between the first frame (3) and the second frame (5) is two, and the projections of the two frame driving components (6) are respectively located on one side of the first frame (3), and the two sides are perpendicular to each other; or, the number of frame driving components (6) is four, and their projections are set one-to-one with the four sides of the first frame (3).

5. The lens driving module as described in claim 2, characterized in that: The first frame (3) is provided with a mounting groove, and the first coil (601) is provided in the mounting groove; the first magnet group (600) includes two groups, one group is installed on the top surface of the base (2), and the other group is installed on the bottom surface of the second frame (5); the first coil (601) and the two first magnet groups (600) are arranged vertically coaxially; or, The first frame (3) is provided with a mounting groove, and the first magnet group (600) is provided in the mounting groove; the first coil (601) includes two, one of which is installed on the top surface of the base (2) and the other is installed on the bottom surface of the second frame (5); the two first coils (601) and the first magnet group (600) are arranged vertically coaxially.

6. The lens driving module as described in claim 1, characterized in that: The lens carrier (8) has a first vertical through groove on one of its outer walls that contacts the second frame (5); the second frame (5) has a second vertical through groove on its inner wall corresponding to the first vertical through groove; the first vertical through groove and the second vertical through groove form an installation space; The installation space is provided with a focusing component (9) connected to the second frame (5); the focusing component (9) is used to drive the lens carrier (8) to move along the central axis of the lens.

7. The lens driving module as described in claim 6, characterized in that: The focusing assembly (9) includes a second magnet group (900) and a second coil (901) arranged opposite to each other. The magnets of the second magnet group (900) are stacked along the vertical plane, and the end face of the second coil (901) is parallel to the vertical plane. The second coil (901) is mounted on the second frame (5), and the second magnet group (900) is mounted on the lens carrier (8); or, the second coil (901) is mounted on the lens carrier (8), the second magnet group (900) is mounted on the second frame (5), and the lens carrier (8) and the second frame (5) are electrically connected by a spring.

8. The lens driving module as described in claim 7, characterized in that: Between the lens carrier (8) and the second frame (5), and on at least one side wall of the lens carrier (8), a guide groove is provided, and a guide rod (902) or a plurality of balls are provided in the guide groove.

9. The lens driving module as described in claim 1, characterized in that: The second frame (5) has a skirt on the outer periphery of its bottom; the bottom end of the second elastic support (7) is connected to the skirt, and the top end is connected to the top of the first frame (3); or, The bottom end of the second elastic support (7) is connected to the inner bottom wall of the first frame (3), and the top end is connected to the top of the second frame (5).

10. A camera, characterized in that, It includes: The lens driving module as described in any one of claims 1-9; A position sensor, located inside the housing of the lens drive module, is used to detect the horizontal displacement of the first frame (3) and the second frame (5); A control component is connected to the frame drive component (6) of the lens drive module and the position sensor respectively; the control component is configured to: receive signals from the position sensor and generate a stabilization compensation control signal in combination with the target command; and control the movement of the first frame (3) and the second frame (5) based on the stabilization compensation control signal.

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