Aperture driving mechanism, lens driving module and camera device

Abstract

The utility model relates to a kind of aperture driving mechanism, lens driving module and camera equipment, including aperture support, and the rotating drive component of the motion of several aperture vane relative aperture support in the plane perpendicular to optical axis is driven, rotating drive component includes the aperture drive frame that rotates relative aperture support, and at least one respectively and aperture support with aperture drive frame connection memory alloy wire, at least one end of memory alloy wire is connected with aperture support or aperture drive frame by positioning clamping structure, at least part of positioning clamping structure is fixed on memory alloy wire, and the remaining part of positioning clamping structure is fixed on aperture support or aperture drive frame. The application advantage: when assembling, the length of required memory alloy wire can be conveniently cut, the precision of mechanism is improved;Due to the existence of positioning clamping structure, when mechanism is assembled, each component can be installed more efficiently, and it is also convenient for the replacement of component later.

Description

Technical Field

[0001] This application belongs to the field of camera equipment components, and particularly relates to an aperture driving mechanism, a lens driving module, and a camera device. Background Technology

[0002] Miniature cameras used in mobile phones typically feature variable apertures on the lens, positioned at the front of the lens. This increases the overall height and weight of the lens, negatively impacting the focusing mechanism.

[0003] This invention relates to a miniature variable aperture driver. An integrated connecting rod drives the opening and closing of the variable aperture blades. This connecting rod is positioned in the lower space of the aperture blades, minimizing the height of the mechanism on the lens and improving aperture opening and closing accuracy. This invention uses two shape memory alloy wires to drive a lever, which in turn rotates the ring, causing a large-angle deflection of the aperture blades. The assembly accuracy of the shape memory alloy wire length is a crucial indicator for improving the assembly pass rate. This invention uses a high-precision spacing clamp to obtain an assembly of shape memory alloy wires of high-precision length, and then positions and assembles this assembly on the drive mechanism using the clamp.

[0004] Patent CN115268173B discloses a variable aperture, a camera module, and an electronic device. The variable aperture includes a base, a fixed plate, a turntable, multiple blades, a first SMA line, and a second SMA line. The fixed plate is fixedly connected to the base, and the turntable is rotatably connected to the base and surrounds the fixed plate. The multiple blades are arranged in a ring, forming an aperture hole. Each blade is rotatably connected to the fixed plate and slidably connected to the turntable. One end of the first SMA line and the second SMA line are connected to the base, and the other end is connected to the turntable. The first or second SMA line retracts when energized, causing the turntable to rotate relative to the fixed plate. Each blade rotates relative to the fixed plate and slides relative to the turntable, thus changing the aperture diameter. The direction in which the first SMA line retracts and causes the turntable to rotate is opposite to the direction in which the second SMA line retracts and causes the turntable to rotate. The aperture diameter adjustment precision of the aforementioned variable aperture is high.

[0005] In the aforementioned patent, the shape memory alloy wire and the conductive structure are directly and fixedly connected together during assembly, which increases the cost of assembly and replacement. When replacing a single shape memory alloy wire, the entire conductive device must be disassembled. In addition, the aforementioned patent places the conductive structure and the shape memory alloy wire in the same plane, which occupies a large lateral area and is not conducive to the miniaturization of the camera module. Utility Model Content

[0006] The purpose of this utility model is to address the above-mentioned problems by providing an aperture driving mechanism, a lens driving module, and a camera device that can solve the aforementioned technical problems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An aperture drive mechanism includes an aperture support and a rotary drive assembly that drives a plurality of aperture blades to move relative to the aperture support in a plane perpendicular to the optical axis. The rotary drive assembly includes an aperture drive frame that rotates relative to the aperture support and at least one shape memory alloy wire that is connected to the aperture support and the aperture drive frame respectively. At least one end of the shape memory alloy wire is connected to the aperture support or the aperture drive frame through a positioning clip structure. At least a portion of the positioning clip structure is fixed to the shape memory alloy wire, and the remaining portion of the positioning clip structure is fixed to the aperture support or the aperture drive frame.

[0009] The positioning clip structure includes a fixing clip and a positioning clip that cooperate with each other;

[0010] The fixing clip is fixed to the shape memory alloy wire, and the positioning buckle is fixed to the aperture bracket or the aperture drive frame.

[0011] The positioning buckle has a first positioning surface, and the fixing clamp has a second positioning surface that fits against the first positioning surface. The first positioning surface and the second positioning surface are perpendicular to the extension and retraction direction of the shape memory alloy wire.

[0012] Furthermore, there are two positioning clip structures on the same shape memory alloy wire, defined as a first positioning clip structure and a second positioning clip structure. One end of the shape memory alloy wire is connected to the aperture bracket through the first positioning clip structure, and the other end of the shape memory alloy wire is connected to the aperture drive bracket through the second positioning clip structure.

[0013] Furthermore, the first positioning clip structure and the second positioning clip structure are respectively conductive, the shape memory alloy wire is electrically connected to the first positioning clip structure, and the shape memory alloy wire is electrically connected to the second positioning clip structure.

[0014] Furthermore, in at least a portion of the extension and retraction direction of the shape memory alloy wire, the aperture support and the aperture drive frame are also connected by a damping conductive element, and the damping conductive element and the second positioning clip structure are electrically connected; the shape memory alloy wire is used to drive the aperture drive frame to rotate around the optical axis and drive a plurality of aperture blades to open and close during the extension and retraction process.

[0015] Furthermore, the aperture bracket is provided with electrode terminals that are electrically connected to the damping conductive element and the first positioning clip structure, respectively.

[0016] Furthermore, the aperture support has a blade receiving chamber and a drive receiving chamber, the rotary drive assembly is located in the drive receiving chamber, and the aperture blade is located in the blade receiving chamber.

[0017] This application also provides a lens driving module, which includes the aperture driving mechanism.

[0018] This application also provides a camera device, which includes the lens driving module.

[0019] Compared with existing technologies, the advantages of this application are: the required length of the shape memory alloy wire can be easily cut during assembly, improving the accuracy of the mechanism; due to the presence of the positioning clip structure, the various components can be installed more efficiently during the assembly of the mechanism, and the components can be easily replaced later. Attached Figure Description

[0020] Figure 1 Top view of the main structure assembly of the aperture drive mechanism of this utility model;

[0021] Figure 2 for Figure 1 Assembly diagram of the hidden shape memory alloy wire in the mid-aperture drive mechanism;

[0022] Figure 3 The main assembly view of the aperture drive mechanism of this utility model;

[0023] Figure 4 for Figure 3 Assembly diagram of the hidden aperture bracket in the mid-aperture drive mechanism;

[0024] Figure 5 This is a structural assembly diagram of the various components of the rotary drive assembly of this utility model;

[0025] Figure 6 This is an assembly drawing of the connecting scale and fixing clamp of this utility model;

[0026] Figure 7 This is a diagram showing the assembly relationship between the fixing clip and the positioning buckle of this utility model;

[0027] Figure 8 This is a schematic diagram illustrating an example of an electronic device in Example 4.

[0028] In the figure, there are: aperture bracket 1, aperture blades 2, rotary drive assembly 3, aperture drive frame 30, shape memory alloy wire 31, positioning clip structure 32, first positioning clip structure 32a, second positioning clip structure 32b, fixing clip 320, positioning buckle 321, damping conductive component 33, electrode terminal 34, optical axis Z, plane xY, and connecting scale D. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] Example 1

[0031] like Figures 1-5 As shown, the aperture drive mechanism includes an aperture support 1 and a rotary drive assembly 3 that drives a plurality of aperture blades 2 to move relative to the aperture support 1 in a plane xY perpendicular to the optical axis Z. The rotary drive assembly 3 includes an aperture drive frame 30 that rotates relative to the aperture support 1 and at least one shape memory alloy wire 31 that is connected to the aperture support 1 and the aperture drive frame 30 respectively. At least one end of the shape memory alloy wire 31 is connected to the aperture support 1 or the aperture drive frame 30 through a positioning clip structure 32. At least a portion of the positioning clip structure 32 is fixed to the shape memory alloy wire 31, and the remaining portion of the positioning clip structure 32 is fixed to the aperture support 1 or the aperture drive frame 30.

[0032] The advantage of the positioning clip structure 32 is that it allows for easy cutting of the required length of the shape memory alloy wire 31 during assembly, improving the precision of the mechanism. Due to the presence of the positioning clip structure 32, the various components can be installed more efficiently during the assembly of the mechanism, and it also facilitates the replacement of components later.

[0033] The shape memory alloy wire 31 is connected to the aperture bracket 1 and the aperture drive frame 30 at both ends. When the shape memory alloy wire 31 is energized, it contracts, pulling the aperture drive frame 30 to rotate around a fixed axis, which in turn drives the blades to open and close.

[0034] The positioning clip structure 32 includes a fixing clip 320 and a positioning clip 321 that cooperate with each other;

[0035] The fixing clip 320 is fixed to the shape memory alloy wire 31, and the positioning buckle 321 is fixed to the aperture bracket 1 or the aperture drive bracket 30.

[0036] like Figure 7 As shown, when the fixing clip 320 and the positioning buckle 321 are connected, they have a concave-convex structure and a limiting structure. During assembly, the shape memory alloy wire 31 is fixedly connected to the fixing clip 320. When assembled, the concave-convex structure and the limiting structure make the fixing clip 320 and the positioning buckle 321 firmly connected and are used to position the fixing clip 320 and the positioning buckle 321.

[0037] like Figure 7As shown, in this embodiment, the limiting structure consists of two parallel limiting rods on the positioning buckle 321 arranged along the optical axis Z direction. Part of the fixing clip 320 is inserted between the two parallel limiting rods to prevent relative movement between the two on the plane xY. In this embodiment, the concave-convex structure consists of a convex structure on the fixing clip 320 and a concave structure on the positioning buckle 321. The two structures cooperate with each other to limit the unstable swaying of the fixing clip 320 and the positioning buckle 321 on the plane xY.

[0038] There are two positioning clip structures 32 on the same shape memory alloy wire 31, defined as the first positioning clip structure 32a and the second positioning clip structure 32b. One end of the shape memory alloy wire 31 is connected to the aperture bracket 1 through the first positioning clip structure 32a, and the other end of the shape memory alloy wire 31 is connected to the aperture drive bracket 30 through the second positioning clip structure 32b.

[0039] In this embodiment, a fixing clip 320 is fixed at each end of the shape memory alloy wire 31. The two fixing clips 320 are connected by a connecting material before assembly, which facilitates the positioning of the distance between the two fixing clips 320. Similarly, it can more accurately position the length of the shape memory alloy wire 31.

[0040] The positioning buckle 321 has a first positioning surface, and the fixing clip 320 has a second positioning surface that fits with the first positioning surface. The first positioning surface and the second positioning surface are perpendicular to the extension and retraction direction of the memory alloy wire 31. In this embodiment, the fixing clips 320 at both ends of the same memory alloy wire 31 are set on the side of the corresponding positioning buckle 321 away from the other positioning buckle 321. The first positioning surface is set on the side of the limiting rod away from the other fixing clip 320, and the second positioning surface is set on the side of the corresponding fixing clip 320 facing the other fixing clip 320. When the first positioning surface and the second positioning surface fit together, the two ends of the memory alloy wire 31 can be positioned, and at the same time, the distance between the two fixing clips 320 is a specified distance.

[0041] The first positioning clip structure 32a and the second positioning clip structure 32b are respectively conductive. The shape memory alloy wire 31 and the first positioning clip structure 32a are electrically connected, and the shape memory alloy wire 31 and the second positioning clip structure 32b are electrically connected. In this embodiment, both the fixing clip 320 and the positioning clip 321 are metal parts and are conductive. When the fixing clip 320 and the positioning clip 321 are fixedly connected, they can achieve conductivity. In other embodiments, the fixing clip 320 is a metal part, and the positioning clip 321 is a part of the aperture bracket 1 or the aperture drive frame 30, which is only used for positioning. The electrical conductivity is achieved by a metal insert embedded in the aperture bracket 1 and the aperture drive frame 30 and welded to the fixing frame 320. At least a portion of the metal insert of the aperture bracket 1 is used to extend out of the aperture bracket 1, thereby enabling current input and output.

[0042] Shape memory alloy wire 31 is a special material with shape memory effect, which can change shape when subjected to external stimuli (such as temperature changes). The conductive positioning clip structure 32 enables circuit connection and transmission. The conductivity of the positioning clip structure 32 simplifies circuit connection methods and improves the reliability and stability of electrical signal transmission.

[0043] In at least part of the telescopic direction of the shape memory alloy wire 31, the aperture support 1 and the aperture drive frame 30 are also connected by a damping conductive element 33, and the damping conductive element 33 and the second positioning clip structure 32b are electrically connected; the shape memory alloy wire 31 is used to drive the aperture drive frame 30 to rotate around the optical axis Z and drive a plurality of aperture blades 2 to open and close during the telescopic process. In this embodiment, one end of the damping conductive element 33 is electrically connected to the metal part in the aperture support 1, and the other end is electrically connected to the corresponding fixing clip 320 on the aperture drive frame 30.

[0044] The damping conductive element 33 combines damping effect and conductive function, which can improve the accuracy of aperture control, while also providing a spring-back reset effect.

[0045] Along the Z-axis of the optical axis, the damping conductive element 33 and the shape memory alloy wire 31 are spaced apart and parallel to each other. The advantage of this design is that, through reasonable spacing and parallel arrangement, the circuit structure can be optimized and the overall system performance can be improved. At the same time, by separating the elastic damping conductive element 33 and the shape memory alloy wire 31 and arranging them in parallel, mutual interference between them can be reduced, electromagnetic interference can be avoided, and the stability and reliability of the system can be improved.

[0046] The aperture support 1 is provided with electrode terminals 34 that are electrically connected to the damping conductive element 33 and the first positioning clip structure 32a respectively.

[0047] Electrode terminal 34 is connected to an external circuit board. When it is necessary to change the aperture size, current is supplied to the external circuit board. The current first flows from electrode terminal 34 through damping conductive element 33, then through the second positioning clip structure 32b at the connection between aperture drive frame 30 and shape memory alloy wire 31, and into shape memory alloy wire 31. Shape memory alloy wire 31 will expand and contract when there is current. The current then flows from shape memory alloy wire 31 through the first positioning clip structure 32a into electrode terminal 34, and finally back to the circuit board.

[0048] The aperture support 1 has a blade receiving chamber and a drive receiving chamber. The rotary drive assembly 3 is located in the drive receiving chamber, and the aperture blade 2 is located in the blade receiving chamber.

[0049] The aperture blade 2 is slidably connected to the aperture support 1, and the aperture blade 2 is rotatably connected to the aperture drive frame 30 in the rotary drive assembly 3. When the aperture is changed, the aperture drive frame 30 drives the aperture blade 2 to rotate and move around the optical axis Z on the aperture support 1, thus completing the change of the aperture.

[0050] like Figure 4 As shown, in this embodiment, a ball bearing assembly is also provided between the aperture support 1 and the aperture drive frame 30. The ball bearing assembly is provided to reduce the friction force generated by the relative rotation between the aperture support 1 and the aperture drive frame 30.

[0051] Example 2

[0052] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in the assembly method and steps of the shape memory alloy wire 31 for the aperture driving mechanism of Embodiment 1.

[0053] like Figure 6 As shown, the shape memory alloy wire 31 is connected to the aperture bracket 1 and the aperture drive bracket 30 by the following method, which includes the following steps:

[0054] S1. The two fixed clamps 320 are connected together by the connecting scale D;

[0055] This is to ensure the relative distance between the fixing clips 320, so that the fixing clips 320 can be positioned and assembled more accurately in the subsequent assembly mechanism.

[0056] S2. Fix both ends of the shape memory alloy wire 31 to the fixing clips 320 in S1 respectively;

[0057] In this embodiment, two fixing clips 320 are located at both ends of the connecting scale D. The shape memory alloy wire 31 is fixedly threaded through the fixing clips 320 to ensure that the shape memory alloy wire 31 will not slide off relative to the fixing clips 320.

[0058] S3. Remove the connecting scale D in S2 to obtain a shape memory alloy wire 31 with fixed clamps 320 connected to both ends. The shape memory alloy wire 31 is connected to the aperture bracket 1 and the aperture drive bracket 30 by the positioning buckle 321 that cooperates with the fixed clamp 320.

[0059] When the fixing clip 320 and the positioning buckle 321 are connected, they have a concave-convex structure and a limiting structure. When assembled, the concave-convex structure and the limiting structure make the fixing clip 320 and the positioning buckle 321 firmly connected, preventing them from falling off, and realizing the positioning of both ends of the shape memory alloy wire 31 on the aperture bracket 1 and the aperture drive frame 30.

[0060] Example 3

[0061] The structure and principle of this embodiment are basically the same as those of Embodiment 1. The difference lies in that, for the aperture driving mechanism of Embodiment 1, this embodiment provides a lens driving module including an aperture driving mechanism.

[0062] The aperture drive mechanism is fixed at the front end of the lens in the lens drive device. At the same time, the lens drive module is connected to the external control circuit. External light passes through the aperture drive assembly and enters the lens in the lens drive device, where it is refracted and finally reaches the imaging area of ​​the device.

[0063] Example 4

[0064] The structure and principle of this embodiment are basically the same as those of Embodiment 3. The difference lies in that, for the lens driving module of Embodiment 3, this embodiment provides a camera device including a lens driving module.

[0065] like Figure 7 As shown, camera modules are used in electronic devices, including 3C products such as computers, mobile smartphones, and digital cameras. In this embodiment, the module is used as a camera imaging component of a mobile smartphone.

[0066] 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 replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An aperture driving mechanism, comprising an aperture support (1) and a rotary drive assembly (3) for driving a plurality of aperture blades (2) to move relative to the aperture support (1) in a plane (xY) perpendicular to the optical axis (Z), characterized in that, The rotation drive assembly (3) includes an aperture drive frame (30) that rotates relative to the aperture support (1), and at least one shape memory alloy wire (31) that is connected to the aperture support (1) and the aperture drive frame (30) respectively. At least one end of the shape memory alloy wire (31) is connected to the aperture support (1) or the aperture drive frame (30) through a positioning clip structure (32). At least a portion of the positioning clip structure (32) is fixed to the shape memory alloy wire (31), and the remaining portion of the positioning clip structure (32) is fixed to the aperture support (1) or the aperture drive frame (30).

2. The aperture driving mechanism according to claim 1, characterized in that, The positioning clip structure (32) includes a fixing clip (320) and a positioning clip (321) that cooperate with each other; The fixing clip (320) is fixed to the shape memory alloy wire (31), and the positioning buckle (321) is fixed to the aperture bracket (1) or the aperture drive bracket (30).

3. The aperture driving mechanism according to claim 2, characterized in that, The positioning buckle (321) has a first positioning surface, and the fixing clip (320) has a second positioning surface that fits against the first positioning surface. The first positioning surface and the second positioning surface are perpendicular to the extension and retraction direction of the memory alloy wire (31).

4. The aperture driving mechanism according to claim 1, 2, or 3, characterized in that, There are two positioning clip structures (32) on the same shape memory alloy wire (31), defined as a first positioning clip structure (32a) and a second positioning clip structure (32b). One end of the shape memory alloy wire (31) is connected to the aperture bracket (1) through the first positioning clip structure (32a), and the other end of the shape memory alloy wire (31) is connected to the aperture drive bracket (30) through the second positioning clip structure (32b).

5. The aperture driving mechanism according to claim 4, characterized in that, The first positioning clip structure (32a) and the second positioning clip structure (32b) are respectively conductive. The shape memory alloy wire (31) is electrically connected to the first positioning clip structure (32a) and the shape memory alloy wire (31) is electrically connected to the second positioning clip structure (32b).

6. The aperture driving mechanism according to claim 5, characterized in that, In at least part of the extension and retraction direction of the shape memory alloy wire (31), the aperture support (1) and the aperture drive frame (30) are also connected by a damping conductive element (33), and the damping conductive element (33) and the second positioning clip structure (32b) are electrically connected; the shape memory alloy wire (31) is used to drive the aperture drive frame (30) to rotate around the optical axis (Z) and drive a plurality of aperture blades (2) to open and close during the extension and retraction process.

7. The aperture driving mechanism according to claim 6, characterized in that, The aperture bracket (1) is provided with electrode terminals (34) that are electrically connected to the damping conductive element (33) and the first positioning clip structure (32a).

8. The aperture driving mechanism according to claim 1, characterized in that, The aperture support (1) has a blade receiving chamber and a drive receiving chamber, the rotary drive assembly (3) is located in the drive receiving chamber, and the aperture blade (2) is located in the blade receiving chamber.

9. A lens driving module, characterized in that, The lens driving module includes the aperture driving mechanism as described in any one of claims 1-8.

10. A camera device, characterized in that, The camera device includes the lens driving module as described in claim 9.

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