A suspension wire OIS motor with ball AF

Abstract

The utility model relates to a kind of suspension wire OIS motor with ball AF, including shell, frame, lens seat;Lens seat is movably connected with frame by AF guide piece;Frame is equipped with the limiting block at the both ends of AF guide piece to limit the displacement of the AF guide piece along optical axis direction;AF guide piece includes several balls;Frame is equipped with the accommodating groove accommodating AF drive coil;The part of frame equipped with accommodating groove is equipped with FPC board matched with the AF drive coil on the side away from the lens seat;FPC board is connected with magnetic attraction metal sheet and AF drive IC on the side away from the AF drive coil.The AF guide piece mainly realizes focusing by the movement of lens seat using rolling friction;The limiting block at the both ends of AF guide piece can directly limit AF guide piece, facilitate the installation of ball;AF drive IC and AF drive coil are arranged on the two sides of FPC board, which can effectively reduce the occupation of accommodating groove space.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging, and in particular to a suspension wire OIS motor with ball bearing AF. Background Technology

[0002] As consumers' demand for mobile phone photography increases, the functions of mobile phone cameras (i.e., camera modules) are becoming more and more abundant. Features such as portrait shooting, telephoto shooting, optical zoom, and optical image stabilization are all integrated into cameras with limited space. Among them, autofocus and optical image stabilization often rely on optical actuators (or motors) to achieve these functions.

[0003] Autofocus (AF) works by utilizing the principle of light reflection from an object. The reflected light is received by the camera's CCD sensor, processed by a computer, and then drives the motorized focusing mechanism to achieve focus. Optical image stabilization (OIS) refers to the use of optical components, such as lens settings, in cameras or other similar imaging instruments to avoid or reduce camera shake during the capture of optical signals, thereby improving image quality. OIS achieves this by employing special lens or CCD sensor structures to minimize image instability caused by operator movement.

[0004] Mobile phone camera modules are evolving towards higher resolution and higher pixel counts, creating a digital camera-like experience. A major drawback of this development is the increasing size of lenses, leading to larger overall dimensions and heavier supporting components. The addition of variable apertures further complicates this, making it difficult for conventional suspension structures to support the weight. Traditional OIS motors typically use a spring-loaded suspension structure, with the spring handling resetting and focusing, and the suspension wire for image stabilization. During focusing, i.e., when the device moves along the Z-axis, it is prone to wobbling within the frame, resulting in insufficient Z-axis guidance and significant tilting, thus rendering focusing and image stabilization ineffective. Some existing technologies use AF guide rod structures to achieve Z-axis (optical axis) movement. While this overcomes the problem of limited travel space in traditional spring-loaded AF systems, the guide rod relies on sliding friction, resulting in a high coefficient of friction and requiring significant thrust. Utility Model Content

[0005] To address the aforementioned problems in the prior art, this utility model provides a suspension wire OIS motor with ball bearing AF.

[0006] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0007] A suspension wire OIS motor with ball bearing AF, comprising:

[0008] The shell has a hollow cavity formed inside it;

[0009] The frame, set within the hollow cavity, is configured to move perpendicular to the optical axis.

[0010] The lens mount, located within the frame, is configured to move along the optical axis.

[0011] The lens mount is movably connected to the frame via an AF guide; the frame is provided with limiting blocks at both ends of the AF guide to limit the displacement of the AF guide along the optical axis; the AF guide includes several ball bearings; the frame is provided with a receiving groove for accommodating the AF drive coil; the portion of the frame with the receiving groove has an FPC board that mates with the AF drive coil on the side opposite to the lens mount; a magnetic metal sheet and an AF drive IC are connected to the side of the FPC board opposite to the AF drive coil.

[0012] In one embodiment of the present invention, the housing includes an outer cover and a base; the bottom opening of the outer cover is fixedly connected to the base to form a hollow cavity inside.

[0013] In one embodiment of the present invention, an AF drive assembly for driving the lens mount to move is provided between the lens mount and the frame; the AF drive assembly includes an AF drive magnet disposed on the side of the lens mount and an AF drive coil disposed on the inner side of the frame relative to the AF drive magnet.

[0014] In one embodiment of the present invention, an OIS driving assembly for driving the frame to move is provided between the frame and the housing; an upper spring is fixedly connected to the corner of the frame; the upper spring is connected to the housing through a suspension wire; the OIS driving assembly includes an OIS driving magnet disposed on the frame and an OIS driving coil disposed on the housing opposite to the OIS driving magnet.

[0015] In one embodiment of the present invention, the frame is provided with a first guide groove that cooperates with the AF guide; the lens mount is provided with a second guide groove that cooperates with the AF guide and is disposed opposite to the first guide groove.

[0016] In one embodiment of this utility model, two AF guides are arranged parallel to each other on the same side; the first guide groove and the second guide groove are V-shaped grooves; the AF guides are arranged along the optical axis; the frame is provided with an AF drive coil and a magnetic metal sheet that cooperate with the AF drive magnet in the AF drive assembly.

[0017] In one embodiment of this utility model, the AF guide includes at least two large balls and a plurality of small balls disposed between adjacent large balls; the diameter of the small balls is smaller than the diameter of the large balls.

[0018] In one embodiment of this utility model, the contact portion formed between the large ball and the frame or lens mount has a tendency to move in the same direction.

[0019] In one embodiment of this utility model, the frame includes a first frame and a second frame that are fixedly connected; the AF guide cooperates with the second frame.

[0020] In one embodiment of this utility model, the AF drive coil is disposed in the receiving groove in the middle of the second frame; the FPC board is connected to the side of the second frame away from the lens mount; the magnetic metal sheet is provided with a hollow groove; the AF drive IC is disposed in the hollow groove and connected to the FPC board.

[0021] The beneficial effects of this utility model are: using an AF guide as a guide structure can effectively improve the reliability of focusing. The AF guide has a better linear guiding effect, which effectively improves the accuracy of the displacement direction during focusing. The AF guide mainly uses rolling friction to move the lens mount to achieve focusing, which can significantly reduce friction and reduce the demand for thrust.

[0022] The limiting blocks at both ends of the AF guide can directly limit the AF guide, which facilitates the installation of the ball bearings and provides a better limiting effect for the ball bearings.

[0023] The magnetic metal plate can work with the AF drive magnet to clamp the AF guide, ensuring the directionality of the lens mount's movement.

[0024] The AF driver IC and AF driver coil are set on opposite sides of the FPC board, which can effectively reduce the space occupied by the receiving slot and facilitate the soldering connection between the AF driver coil and the FPC board. On the other hand, the AF driver coil can also be larger in size to provide greater thrust.

[0025] The suspension wire serves as a guide for the frame to move along the vertical optical axis, conducts electricity, and acts as an electrical connection between the FPC board and the circuitry within the base. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is an exploded view of the structure of this utility model;

[0028] Figure 2 yes Figure 1 Exploded view of the second frame in the middle;

[0029] Figure 3 This is an exploded view of the structure of this utility model. Figure 2 ;

[0030] Figure 4 This is a schematic diagram of the AF guide component structure in one embodiment of this utility model;

[0031] Figure 5 This is a schematic diagram of the movement of ball guide components in existing technology.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Housing; 110. Base; 120. Outer cover; 200. Frame; 201. First frame; 202. Second frame; 203. First guide groove; 204. Limiting block; 205. Receiving groove; 210. OIS drive assembly; 211. OIS drive magnet; 212. OIS drive coil; 220. Upper spring; 230. Suspension wire; 240. FPC board; 250. Magnetic metal sheet; 251. Hollowed-out groove; 260. AF drive IC; 300. Lens mount; 301. Second guide groove; 310. AF drive assembly; 311. AF drive magnet; 312. AF drive coil; 320. AF guide; 321. Large ball; 322. Small ball. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0035] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model 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 utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within 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.

[0037] Example:

[0038] like Figure 1 As shown, a suspension wire OIS motor with ball bearing AF includes a housing 100, which has a hollow cavity formed inside. In one embodiment, the housing 100 includes an outer cover 120 and a base 110. The bottom opening of the outer cover 120 is fixedly connected to the base 110 to form a hollow cavity inside. In another embodiment, the housing 100 may only include the base 110, and the main function of the outer cover 120 is to limit and prevent the internal moving parts from detaching. When the internal moving parts cooperate with the base 110 through the limiting structure, the structure of the outer cover 120 can be omitted. In one embodiment, the top of the lens mount 300 is provided with a cover plate (not shown in the figure) fixedly connected to the frame 200. The cover plate can be used to limit the lens mount 300 and prevent the lens mount 300 from detaching from the top of the frame 200. In another embodiment, the frame 200 can be provided with several limiting parts to prevent the lens mount 300 from detaching from the frame 200.

[0039] In one embodiment, the hollow cavity further includes a frame 200 that can move perpendicular to the optical axis, and a lens mount 300 that can move along the optical axis and is disposed within the frame 200; the optical axis direction generally refers to the optical axis direction of the lens mount 300, that is, the propagation direction of light entering the lens (not shown in the figure) in the lens mount 300; see also Figure 1 The optical axis direction is also the Z-axis direction, and the direction perpendicular to the optical axis direction is also the X-axis direction and the Y-axis direction;

[0040] In one embodiment, an OIS drive assembly 210 for driving the frame 200 to move is provided between the frame 200 and the housing 100; an upper spring 220 is fixedly connected to the corner of the frame 200; the upper spring 220 is connected to the housing 100 via a suspension wire 230; the OIS drive assembly 210 includes an OIS drive magnet 211 disposed on the frame 200 and an OIS drive coil 212 disposed on the housing 100 opposite to the OIS drive magnet 211; the OIS drive assembly 210 enables the frame 200 to move along the direction perpendicular to the optical axis to achieve the image stabilization function of the lens mount 300. Movement perpendicular to the optical axis typically includes, for example,... Figure 1 The frame 200 moves along the X and Y axes. The suspension wire 230 serves as a guide structure for the frame 200 to move along the direction perpendicular to the optical axis, and also as an electrical connector to achieve electrical connection with the circuit board inside the base 110. The guide structure can be understood as the suspension wire 230 having a certain degree of rigidity and flexibility. The rigidity of the suspension wire 230 maintains a certain distance between the frame 200 and the base 110. It can be understood that the suspension wire 230 supports the frame 200 and suspends it above the base 110. The suspension wire 230 also has a certain degree of flexibility. When the OIS drive component 210 works, it pushes / pulls the frame 200 to move along the direction perpendicular to the optical axis. The suspension wire 230 will bend under the action of the push / pull force, thereby realizing the anti-shake movement of the frame 200.

[0041] In one embodiment, an AF drive assembly 310 is provided between the lens mount 300 and the frame 200. The AF drive assembly 310 enables the lens mount 300 to move along the optical axis to achieve focus adjustment. Figure 1 The focus adjustment is achieved by moving along the Z-axis. The AF drive assembly 310 includes an AF drive magnet 311 disposed on the side of the lens mount 300 and an AF drive coil 312 disposed on the inner side of the frame 200 relative to the AF drive magnet 311. The AF drive coil 312 controls the AF drive magnet 311 to drive the lens mount 300 to move along the optical axis. A Hall sensor is usually disposed in the AF drive coil 312 to accurately sense the movement position of the AF drive magnet 311, so as to achieve more precise position control and reset control.

[0042] In one embodiment, the lens mount 300 is movably connected to the frame 200 via an AF guide 320. The frame 200 has limiting blocks 204 located at both ends of the AF guide 320 to limit the displacement of the AF guide 320 along the optical axis. The AF guide 320 includes several ball bearings. The limiting blocks 204 are positioned at both ends of the AF guide 320 for limiting, thus allowing the AF guide 320 to be limited using only one component of the frame 200. Compared to the prior art, which typically uses one limiting component each on the frame 200 and the lens mount 300 to limit the ends of the AF guide 320, this simplifies the installation process and facilitates the assembly of the ball bearings. Using the AF guide 320 as a guiding structure effectively improves focusing reliability. The AF guide 320 provides better linear guidance, effectively improving the directional accuracy of displacement during focusing. The AF guide 320 primarily utilizes rolling friction to move the lens mount 300 for focusing, significantly reducing friction and the need for thrust.

[0043] In one embodiment, the frame 200 is provided with a receiving slot 205 for accommodating the AF drive coil 312; the portion of the frame 200 with the receiving slot 205 has an FPC board 240 on the side opposite to the lens mount 300, which cooperates with the AF drive coil 312; a magnetic metal sheet 250 and an AF drive IC 260 are connected to the side of the FPC board 240 opposite to the AF drive coil 312. The AF drive IC 260 and the AF drive coil 312 are respectively arranged on both sides of the FPC board 240, which can effectively reduce the space occupied by the receiving slot 205, facilitate the soldering connection between the AF drive coil 312 and the FPC board 240, and allow the AF drive coil 312 to be larger in size to provide greater thrust.

[0044] In one embodiment of the present invention, the frame 200 is provided with a first guide groove 203 that cooperates with the AF guide 320; the lens mount 300 is provided with a second guide groove 301 that cooperates with the AF guide 320 and is disposed opposite to the first guide groove 203.

[0045] In one embodiment of this utility model, two AF guide members 320 are arranged parallel to each other on the same side; the first guide groove 203 and the second guide groove 301 are V-shaped grooves; the AF guide members 320 are arranged along the optical axis; the frame 200 is provided with an AF drive coil 312 that cooperates with the AF drive magnet 311 in the AF drive assembly 310 and a magnetic metal sheet 250. Through the cooperation of the magnetic metal sheet 250 and the AF drive magnet 311, the AF guide member 320 can be clamped between the frame 200 and the lens mount 300 by magnetic attraction. The first guide groove 203 and the second guide groove 301 can achieve better parallelism by using the AF guide member 320, and the linear movement of the lens mount 300 is better.

[0046] In one embodiment of the present invention, the AF guide 320 includes at least two large balls 321 and a plurality of small balls 322 disposed between adjacent large balls 321; the diameter of the small balls 322 is smaller than the diameter of the large balls 321. In this structure, the large ball bearing 321 can simultaneously contact the frame 200 and the lens mount 300, while the small ball bearing 322 serves as a support and guide between the large ball bearing 321. Since the AF guide 320 is clamped by the frame 200 and the lens mount 300, the large ball bearing 321 mainly bears the pressure from the lens mount 300 and the frame 200; while the small ball bearing 322 only bears the weight of the other balls above it and the friction of adjacent balls in the optical axis direction (Z-axis direction). That is, the pressure on the large ball bearing 321 is significantly greater than the pressure on the small ball bearing 322. This allows the large ball bearing 321 to effectively roll in the same direction when the lens mount 300 moves, thereby ensuring that the large ball bearing 321 can effectively perform rolling friction and avoiding sliding friction when the large ball bearing 321 is working. The movement of the small ball bearing 322 does not easily change the movement state of the large ball bearing 321.

[0047] In existing technologies, structures using multiple ball bearings for guidance all have balls of the same size, meaning each ball bears the same pressure; see [link to related technology]. Figure 5 Taking two ball bearings of equal size as an example, assuming the lens mount 300 moves upwards, the lens mount 300 will act on the two rollers, causing the two ball bearings to tend to move clockwise. Figure 5 As shown by the solid arrow in the image, the bottom ball bearings, when rotating clockwise, also act on the upper ball bearings, causing the upper ball bearings to tend to rotate counterclockwise. Figure 5 As shown by the dashed arrow, the same situation occurs when multiple balls are arranged. This can cause the balls to not be able to effectively guarantee the same rolling trend, resulting in poor rolling. Some balls cannot cooperate with the lens mount 300 by rolling friction, thus causing poor rolling. Some balls cooperate with the lens mount 300 by sliding friction, which may even cause shaking and affect the image stabilization effect. Figure 5 This is merely to illustrate the technical problems that may arise when multiple balls of the same size are guided together. When only two balls are set, the aforementioned problem of uneven rolling is not very significant. However, when three or more balls are set, the probability of uneven rolling increases significantly. Therefore, in one embodiment of this utility model, two AF guides 320 are provided. One AF guide 320 includes two large balls 321 and two small balls 322 disposed between the two large balls 321. The other AF guide 320 is set with two large balls 321. This can also ensure smooth movement and reduce friction during movement.

[0048] In one embodiment of this utility model, the contact portion formed between the large ball bearing 321 and the frame 200 or lens mount 300 has a tendency to move in the same direction; such as Figure 4 As shown, the structure is illustrated with a small ball 322 positioned between two large balls 321. The small ball 322 is clamped between the two large balls 321, and its size is smaller. Figure 4 The dotted line indicates the size difference between the large ball bearing 321 and the small ball bearing 322. Therefore, the small ball bearing 322 typically only abuts against the lens mount 300 or frame 200, or is held in the middle by the large ball bearing 321. The two large balls bearing 321 can rotate in the same direction. Even when the three balls are rolling close together, the small ball bearing 322, acting as a conductor, promotes the same-direction rotation of the two large balls bearing 321, effectively ensuring smooth movement and reducing vibration. When the lens mount 300 is driven by AF to move in the positive Z-axis direction, the large ball bearing 321... Figure 4 The rotation of the large ball bearing 321 is directly driven by the movement of the lens mount 300, while the small ball bearing 322 is a driven structure, mainly driven by the rotation of the large ball bearing 321. The small ball bearing 322 rotates counterclockwise. Due to its small size, the pressure of the small ball bearing 322 against the lens mount 300 or frame 200 is very small, and the friction is insufficient to affect the rotation of the small ball bearing 322. Therefore, in actual movement, the large ball bearing 321 and the small ball bearing 322 can effectively maintain rolling, thereby avoiding the movement of the lens mount 300. The presence of sliding friction allows the AF guide 320 to maintain rolling friction during movement, effectively preventing focus shake and improving focusing speed. It should be noted that when multiple small balls 322 are placed between the two large balls 321, it will not affect the trend of the large balls 321 moving in the same direction. This is because the driving force of the small balls 322 mainly comes from the friction transmitted by the large balls 321, and this friction is much smaller than the friction exerted by the lens mount 300 on the large balls 321. Therefore, the movement of the small balls 322 will not hinder the movement of the large balls 321 in the same direction.

[0049] In one embodiment of this utility model, the frame 200 includes a first frame 201 and a second frame 202 fixedly connected; the AF guide 320 cooperates with the second frame 202. That is, the frame 200 can be manufactured in two parts and then fixed; in one embodiment, the frame 200 can also be a one-piece structure.

[0050] like Figure 2 and Figure 3 As shown, in one embodiment of this utility model, the AF drive coil 312 is disposed in the receiving groove 205 in the middle of the second frame 202; the FPC board 240 is connected to the side of the second frame 202 opposite to the lens mount 300; the magnetic metal sheet 250 is provided with a hollow groove 251; the AF drive IC 260 is disposed in the hollow groove 251 and connected to the FPC board 240. The AF drive IC 260 and the AF drive coil 312 are disposed on opposite sides of the FPC board 240, which can effectively reduce the space occupied by the receiving groove 205 and facilitate the soldering connection between the AF drive coil 312 and the FPC board 240. On the other hand, the AF drive coil 312 can also be larger in size to provide greater thrust.

[0051] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A suspension wire OIS motor with ball AF, characterized in that, include: The shell (100) has a hollow cavity formed therein; The frame (200) is set inside the hollow cavity and configured to move perpendicular to the optical axis; The lens mount (300), disposed within the frame (200), is configured to be movable along the optical axis; The lens mount (300) is movably connected to the frame (200) via an AF guide (320); the frame (200) is provided with limiting blocks (204) located at both ends of the AF guide (320) to limit the displacement of the AF guide (320) along the optical axis; the AF guide (320) includes several balls; the frame (200) is provided with a receiving groove (205) for accommodating the AF drive coil (312); the portion of the frame (200) with the receiving groove (205) is provided with an FPC plate (240) cooperating with the AF drive coil (312) on the side away from the lens mount (300); the side of the FPC plate (240) away from the AF drive coil (312) is connected to a magnetic metal sheet (250) and an AF drive IC (260).

2. The suspended wire OIS motor with ball bearing AF according to claim 1, characterized in that: The housing (100) includes an outer cover (120) and a base (110); the bottom opening of the outer cover (120) is fixedly connected to the base (110) to form a hollow cavity inside.

3. The suspension wire OIS motor with AF balls according to claim 1, characterized in that: An AF drive assembly (310) for driving the lens mount (300) to move is provided between the lens mount (300) and the frame (200); the AF drive assembly (310) includes an AF drive magnet (311) disposed on the side of the lens mount (300) and an AF drive coil (312) disposed on the inner side of the frame (200) relative to the AF drive magnet (311).

4. The suspension OIS motor with AF balls according to claim 1, wherein: An OIS drive assembly (210) for driving the frame (200) to move is provided between the frame (200) and the housing (100); an upper spring plate (220) is fixedly connected to the corner of the frame (200); the upper spring plate (220) is connected to the housing (100) through a suspension wire (230); the OIS drive assembly (210) includes an OIS drive magnet (211) disposed on the frame (200) and an OIS drive coil (212) disposed on the housing (100) opposite to the OIS drive magnet (211).

5. The suspension OIS motor with AF balls according to claim 1, wherein: The frame (200) is provided with a first guide groove (203) that cooperates with the AF guide; the lens mount (300) is provided with a second guide groove (301) that cooperates with the AF guide and is disposed relative to the first guide groove (203).

6. A suspension OIS motor with ball AF according to claim 5, characterized in that: Two AF guides are arranged in parallel on the same side; the first guide groove (203) and the second guide groove (301) are V-shaped grooves; the AF guides are arranged along the optical axis; the frame (200) is provided with an AF drive coil (312) and a magnetic metal sheet (250) that cooperate with the AF drive magnet (311) in the AF drive assembly (310).

7. The suspension wire OIS motor with AF balls according to claim 1 or 6, characterized in that: The AF guide includes at least two large balls (321) and a number of small balls (322) disposed between adjacent large balls (321); the diameter of the small balls (322) is smaller than the diameter of the large balls (321).

8. The suspension OIS motor with AF balls according to claim 7, wherein: The contact portion formed between the large ball bearing (321) and the frame (200) or lens mount (300) tends to move in the same direction.

9. A suspension OIS motor with ball bearing AF according to claim 1, characterized in that: The frame (200) includes a first frame (201) and a second frame (202) that are fixedly connected; the AF guide cooperates with the second frame (202).

10. The suspension OIS motor with AF balls according to claim 9, wherein: The AF drive coil (312) is disposed in the receiving groove (205) in the middle of the second frame (202); the FPC board (240) is connected to the side of the second frame (202) away from the lens mount (300); the magnetic metal sheet (250) is provided with a hollow groove (251); the AF drive IC (260) is disposed in the hollow groove (251) and connected to the FPC board (240).

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