Lens driving device, camera module and electronic device

Abstract

The utility model relates to a kind of lens driving device, camera module and electronic equipment, including frame, and the dynamic frame that frame is moved in the plane perpendicular to optical axis, dynamic frame includes the dynamic body that is moved along the first axis of plane under the drive of first drive component, carrier is moved along and the second axis that is perpendicular to first axis relative to dynamic body under the drive of second drive component, frame and dynamic body between, and dynamic body and carrier between respectively be equipped with motion holding component, motion holding component includes single ball and the ball group formed by several balls, the ball group between frame and dynamic body respectively with frame and dynamic body multiple-point movable contact, the ball group between dynamic body and carrier respectively with dynamic body and carrier multiple-point movable contact.Advantage is that: adopt the hybrid structure of single ball and ball group combination.Single ball provides accurate guidance, ball group compensates plane error by multiple-point support, significantly reduces the requirement to the flatness of part, fundamentally improves the reliability, durability of product.

Description

Technical Field

[0001] This utility model belongs to the field of electronic imaging, and in particular relates to a lens driving device, a camera module and an electronic device. Background Technology

[0002] Miniature cameras used in mobile phones generally employ large-size image sensors because they can capture more light and provide richer details and colors, and are widely used to improve the imaging quality of mobile phones.

[0003] In existing technologies, the image stabilization components in lens drive devices have high requirements for flatness. Most of the moving frame and carrier directly use four-corner ball bearings or triangular ball bearings. However, this design will cause slight shaking of the carrier and moving frame, which will significantly reduce the accuracy and stability of image stabilization. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems by providing a lens driving device, camera module, and electronic device that can solve the above-mentioned technical issues.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A lens driving device includes a frame, a movable frame that moves relative to the frame in a plane perpendicular to the optical axis, and a driving mechanism that drives the movable frame. A motion holding assembly is provided between the movable frame and the frame. The motion holding assembly comprises a single ball bearing and a ball bearing group formed by a plurality of balls. At least two sets of the single ball bearing and the ball bearing group are provided, collectively forming a motion plane of the movable frame perpendicular to the optical axis. Furthermore, the driving mechanism includes a first driving component and a second driving component. The moving frame includes a moving body that moves along a first axis of the plane under the drive of the first driving component, and a carrier that moves relative to the moving body along a second axis perpendicular to the first axis under the drive of the second driving component. Motion holding components are respectively provided between the frame and the moving body, and between the moving body and the carrier. The motion holding component between the frame and the moving body forms a motion plane of the moving body perpendicular to the optical axis, and the motion holding component between the moving body and the carrier forms a motion plane of the carrier perpendicular to the optical axis.

[0006] Furthermore, the number of at least one of the single ball and the ball group in the same set of motion holding components is at least two sets, and the single ball and the ball group are arranged in a triangular or quadrangular distribution.

[0007] Furthermore, two sets of ball bearing groups and / or two sets of single ball bearings are provided between the frame and the moving body along the first axis; two sets of ball bearing groups and / or two sets of single ball bearings are provided between the moving body and the carrier along the second axis.

[0008] Furthermore, thickened portions are provided at the four corners of the moving body, and at least a portion of the thickened portions are provided with ball group receiving grooves for accommodating the ball group and single ball guide grooves for placing the single ball. Either the ball group receiving groove and the single ball guide groove are located on the side of the thickened portion near the frame, and the other is located on the side of the thickened portion near the carrier.

[0009] Furthermore, the single ball between the frame and the moving body rolls along the first axis direction on the frame and / or the moving body, and the single ball between the moving body and the carrier rolls along the second axis direction on the moving body and the carrier.

[0010] Furthermore, the frame is connected to the base via a guide mechanism, and the frame moves linearly along the optical axis under the drive of the third drive component.

[0011] Furthermore, the guiding mechanism includes either a guide post mechanism or a ball-and-column mechanism formed by arranging multiple spheres sequentially along the optical axis.

[0012] As one application, this application also provides a camera module, which includes the lens driving device described above.

[0013] As one application, this application also provides an electronic device, which includes the aforementioned camera module.

[0014] Compared with existing technologies, the advantages of this application are: it adopts a hybrid structure combining single ball bearings and ball bearing clusters. Single ball bearings provide precise guidance, while ball bearing clusters compensate for planar errors through multi-point support, significantly reducing the requirements for the flatness of parts and fundamentally improving the reliability and durability of the product. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the main assembly of the lens driving device of this utility model; Figure 2 This is a top view of the main assembly of the lens driving device of this utility model; Figure 3 An exploded view of the main assembly of the lens driving device of this utility model; Figure 4 Two exploded views of the main assembly of the lens driving device of this utility model; Figure 5 Three exploded views of the main assembly of the lens driving device of this utility model; Figure 6 Four exploded views of the main assembly of the lens driving device of this utility model; Figure 7 Five exploded views of the main assembly of the lens driving device of this utility model; Figure 8 This is a schematic diagram of the moving body assembly of the lens driving device of this utility model; Figure 9 This is a schematic diagram illustrating an example of an electronic device in Embodiment 3.

[0016] In the figure, the components are: frame 1, moving body 2, thickened part 21, carrier 3, base 4, motion holding assembly 5, single ball 51, ball group 52, ball group receiving groove 6, single ball guide groove 7, first guide groove 71, second guide groove 72, guide member 8, guide rod 81, guide rod groove 82, contact plane 9, first axis X, second axis Y, optical axis Z, first drive assembly S1, second drive assembly S2, and third drive assembly S3. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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 of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0019] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0020] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0021] Example 1

[0022] like Figures 1-2 As shown, the lens driving device includes a base 4 with a receiving space. Within the base 4 is a frame 1 that moves relative to the base 4 along the optical axis Z under the drive of a third driving component S3. To optimize the component layout, the driving coil of the third driving component S3 is fixed to the base 4, and the driving magnet of the third driving component S3 is fixed to the frame 1. A guide member 8 is also provided between the frame 1 and the base 4. In this embodiment, the guide member 8 adopts a design with a guide rod 81 and a guide rod groove 82. The guide rod 81 is fixedly connected to the bottom of the base 4, and the guide rod groove 82 is located on the sidewalls of the frame 1 and / or the base 4 perpendicular to the Z-axis. The cooperation of the guide rod 81 and the guide rod groove 82 ensures the linear movement of the frame 1 along the optical axis Z, effectively preventing tilting or jamming that may occur during the driving process. In other embodiments, the guiding mechanism includes a ball-and-cylinder mechanism formed by multiple spheres arranged sequentially along the optical axis Z.

[0023] Furthermore, such as Figures 3-7 As shown, within the aforementioned frame 1, a movable frame is also provided that moves relative to the frame 1 in a plane perpendicular to the optical axis Z. The movable frame includes a moving body 2 that moves along the first axis X of the plane under the drive of the first drive assembly S1, and a carrier 3 that moves relative to the moving body 2 along a second axis Y perpendicular to the first axis X under the drive of the second drive assembly S2. Specifically, to reduce the flatness requirements between the moving parts and improve reliability, the motion holding assembly 5 includes a single ball 51 and a ball group 52 formed by several balls. The motion holding assembly 5 between the frame 1 and the moving body 2 constitutes a plane perpendicular to the optical axis Z. The moving plane of the moving body 2, the ball bearing group 52 between the frame 1 and the moving body 2 respectively makes multiple active contact with the frame 1 and the moving body 2, and the motion holding component 5 between the moving body 2 and the carrier 3 constitutes a moving plane of the carrier 3 perpendicular to the optical axis Z. The ball bearing group 52 between the moving body 2 and the carrier 3 respectively makes multiple active contact with the moving body 2 and the carrier 3. The single ball bearing 51 mainly plays the core role of load bearing and guidance, while the ball bearing group 52 arranged around it together form a stable motion reference plane, effectively compensating for the small flatness error caused by the processing and assembly of parts, and significantly reducing the flatness requirements.

[0024] like Figure 8 As shown, there are several groups of ball bearing groups 52 and individual ball bearings 51. The number of at least one of the individual ball bearings 51 and ball bearing groups 52 in the same group of motion holding components 5 is at least two groups. The individual ball bearings 51 and ball bearing groups 52 are arranged in a triangular or quadrangular distribution. The ball bearings in each group of ball bearing groups 52 are of equal size. In this embodiment, the individual ball bearings 51 and ball bearing groups 52 are arranged in a quadrangular distribution. There are two groups of ball bearing groups 52 and individual ball bearings 51 between the frame 1 and the moving body 2, and between the moving body 2 and the carrier 3. They are located in the corner space of the base 4. The ball bearing groups 52 and individual ball bearings 51 between the frame 1 and the moving body 2 are respectively located on both sides of the first axis X. The ball bearing groups 52 and individual ball bearings 51 between the moving body 2 and the carrier 3 are respectively located on both sides of the second axis Y, providing excellent static balance and dynamic stability for the entire motion system. Thickened portions 21 are provided at the four corners of the moving body 2, and ball bearing group receiving grooves 6 and single ball bearing guide grooves 7 are provided on two diagonally opposite thickened portions 21. One of the ball bearing group receiving grooves 6 and single ball bearing guide grooves 7 is provided on the side of the thickened portion 21 near the frame 1, and the other is provided on the side of the thickened portion 21 near the carrier 3. One of the other two thickened portions 21 is provided with ball bearing group receiving grooves 6 on both the side near the frame 1 and the side near the carrier 3, and the other of the other two thickened portions 21 is provided with single ball bearing guide grooves 7 on both the side near the frame 1 and the side near the carrier 3.

[0025] Each ball bearing group 6 contains a ball bearing group 52. The single ball bearing guide groove 7 includes a first guide groove 71 and a second guide groove 72. At least one first guide groove 71 is provided between the frame 1 and the moving body 2. The first guide grooves 71 are distributed along the first axis X direction, and each first guide groove 71 contains a single ball bearing 51. At least one second guide groove 72 is provided between the moving body 2 and the carrier 3. The second guide grooves 72 are distributed along the second axis Y direction, and each second guide groove 72 contains a single ball bearing 51. The first guide grooves 71 strictly restrict the moving body 2 to linear motion only along the first axis X direction, effectively preventing its lateral displacement and sway in the plane perpendicular to the first axis X. Similarly, the second guide grooves 72 ensure that the movement of the carrier 3 relative to the moving body 2 is strictly constrained in the second axis Y direction.

[0026] In this embodiment, the frame 1 and / or the carrier 3 are provided with contact planes 9 that make multi-point contact with the ball group 52. The contact plane 9 is a whole plane or the bottom surface of the groove corresponding to the ball group receiving groove 6 and the single ball guide groove 7. The first guide groove 71 is at least partially provided in the frame 1 and the remaining part is provided in the moving body 2. The second guide groove 72 is at least partially provided in the moving body 2 and the remaining part is provided in the carrier 3. Specifically, the first guide groove 71 and the second guide groove 72 are V-shaped grooves or U-shaped grooves. At least part of the single ball 51 contacts the groove wall of the guide groove, providing two precise contact points or an optimized contact area for the single ball 51, forming a stable motion reference. When a V-shaped groove is used, its two side groove walls form two-point contact with the single ball 51, which has an automatic centering effect, can effectively compensate for alignment errors, and evenly distribute the motion load, providing extremely high guiding rigidity and rotational constraint, preventing the moving parts from twisting around the optical axis. If a U-shaped groove is used, the contact stress distribution between its arc-shaped groove wall and the single ball 51 is more uniform, which ensures guiding accuracy, reduces the risk of wear during operation, and improves service life.

[0027] Furthermore, regarding the first driving assembly S1 and the second driving assembly S2, similarly to the third driving assembly S3, a strategy of separating the coil and the magnet is also adopted to optimize the component layout within the device. Specifically, the driving coil of the first driving assembly S1 is fixed to the base 4, while its corresponding driving magnet is fixed to the moving body 2 or the carrier 3; similarly, the driving coil of the second driving assembly S2 is fixed to the base 4, while its driving magnet is fixed to the carrier 3.

[0028] In some embodiments, a motion holding assembly 5 is provided between the moving frame and the frame 1. The moving frame is used to carry optical elements, or a carrier for focusing and carrying optical elements is movably arranged inside the moving frame. The motion holding assembly 5 includes a single ball 51 and a ball group 52 formed by a plurality of balls. At least one of the single ball 51 and the ball group 52 is provided with at least two sets and together constitutes a motion plane of the moving frame perpendicular to the optical axis Z. Receiving grooves for accommodating the single ball 51 and the ball group 52 can be provided on the moving frame and the frame 1, respectively. The single ball 51 and the ball group 52 can roll in the receiving grooves respectively.

[0029] Example 2

[0030] The structure and principle of this embodiment are basically the same as those of Embodiment 1 and Embodiment 2. The difference lies in that, for the lens driving device of Embodiment 1, the camera module of this embodiment includes a lens driving device, and the carrier 3 is used to fix optical elements, such as lens groups.

[0031] A camera module is a precision optical component that uses electronic control to adjust the position or shape of lenses to alter the focusing and imaging of light. These modules are widely used in cameras, laser devices, and other applications, enabling functions such as autofocus, optical zoom, and image stabilization, thereby improving image quality and system performance.

[0032] Example 3

[0033] The structure and principle of this embodiment are basically the same as those of Embodiment 2. The difference is that, in relation to the camera module of Embodiment 2, the electronic device in this embodiment includes a camera module.

[0034] like Figure 9 As shown, electronic devices refer to those devices that rely on electronic technology to perform specific functions, such as processing signals, data, or converting energy. They are widely used in fields such as communication, computing, entertainment, and industrial control, including but not limited to smartphones, computers, televisions, audio systems, and medical instruments, which greatly improve the convenience and efficiency of modern life.

[0035] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A lens driving device, comprising a frame (1), a movable frame that moves relative to the frame (1) in a plane perpendicular to the optical axis (Z), and a driving mechanism for driving the movable frame, wherein a motion holding assembly (5) is provided between the movable frame and the frame (1), characterized in that, The motion holding assembly (5) includes a single ball (51) and a ball group (52) formed by a plurality of balls. At least one of the single ball (51) and the ball group (52) is provided with at least two sets and together constitutes a motion plane of the moving frame perpendicular to the optical axis (Z).

2. The lens driving device according to claim 1, characterized in that, The driving mechanism includes a first driving component and a second driving component. The moving frame includes a moving body (2) that moves along a first axis (X) of the plane under the drive of the first driving component, and a carrier (3) that moves relative to the moving body (2) along a second axis (Y) perpendicular to the first axis (X) under the drive of the second driving component. Motion holding components (5) are respectively provided between the frame (1) and the moving body (2) and between the moving body (2) and the carrier (3). The motion holding components (5) between the frame (1) and the moving body (2) form a motion plane of the moving body (2) perpendicular to the optical axis (Z). The motion holding components (5) between the moving body (2) and the carrier (3) form a motion plane of the carrier (3) perpendicular to the optical axis (Z).

3. The lens driving device according to claim 1 or 2, characterized in that, The number of at least one of the single ball (51) and the ball group (52) in the same set of motion holding components (5) is at least two sets, and the single ball (51) and the ball group (52) are arranged in a triangular or quadrangular distribution.

4. The lens driving device according to claim 2, characterized in that, Two sets of ball bearing groups (52) and / or two sets of single ball bearings (51) are provided between the frame (1) and the moving body (2) along the first axis (X); two sets of ball bearing groups (52) and / or two sets of single ball bearings (51) are provided between the moving body (2) and the carrier (3) along the second axis (Y).

5. The lens driving device according to claim 2, characterized in that, Thickened portions (21) are provided at the four corners of the moving body (2), and at least a portion of the thickened portions (21) are provided with ball group receiving grooves (6) for accommodating the ball group (52) and single ball guide grooves (7) for placing the single ball (51). Either the ball group receiving groove (6) or the single ball guide groove (7) is located on the side of the thickened portion (21) near the frame (1), and the other is located on the side of the thickened portion (21) near the carrier (3).

6. The lens driving device according to claim 2, characterized in that, The single ball (51) between the frame (1) and the moving body (2) rolls on the frame (1) and / or the moving body (2) along the first axis (X) direction, and the single ball (51) between the moving body (2) and the carrier (3) rolls on the moving body (2) and the carrier (3) along the second axis (Y) direction.

7. The lens driving device according to claim 2, characterized in that, The frame (1) is connected to the base (4) via a guide mechanism, and the frame (1) moves linearly along the optical axis (Z) under the drive of the third drive component.

8. The lens driving device according to claim 7, characterized in that, The guiding mechanism includes either a guide post mechanism or a ball-and-column mechanism formed by arranging multiple spheres sequentially along the optical axis.

9. A camera module, characterized in that, The camera module includes the lens driving device according to any one of claims 1-8.

10. An electronic device, characterized in that, The electronic device includes the camera module as described in claim 9.

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