SMA actuator, camera module and electronic device

Abstract

The present invention relates to the field of electronics, and discloses an SMA actuator, a camera module, and an electronic device. The SMA actuator comprises an actuator and a driven part; the actuator portion comprises an SMA wire, a support portion, a first elastic portion, a connecting rod, and a second elastic portion; the SMA wire can be energized and contracted, and one end of the connecting rod is connected to the SMA wire; the first elastic portion is provided between the connecting rod and the support portion, and the second elastic portion is provided at the other end of the connecting rod; the first elastic portion and the second elastic portion can be elastically bent; the driven part is connected to the second elastic portion; the SMA wire can drive the connecting rod and the second elastic arm to swing relative to the support portion by contraction, and the second elastic portion can drive the driven part to move. The present invention can avoid relative movement of the connection portion between the actuator portion and the driven part, thereby avoiding the problem of mutual wear between the portion and the driven part, and thus improving the service life.

Description

Technical Field

[0001] The present invention relates to the field of electronics, and in particular to an SMA actuator, a camera module and an electronic device. Background Art

[0002] Actuators are commonly used in electronics, often used to drive cameras. Shape memory alloys (SMAs) are a type of driving element in actuators. SMAs are materials composed of two or more metal elements that exhibit a shape memory effect (SME) through thermoelasticity, martensitic transformation, and its reversal. SMAs can deform at relatively low temperatures and then return to their original shape after electrical heating, achieving electrically controllable contraction.

[0003] A camera module equipped with an SMA actuator generally includes a lens assembly, which is equipped with a plurality of lenses to achieve an imaging function. The SMA actuator needs to drive the lens assembly to move, thereby adjusting the position or direction of the lens assembly.

[0004] In the prior art, the technical defect of the SMA actuator is that it has a relatively serious wear problem, which affects the service life. Summary of the Invention

[0005] The object of the present invention is to solve at least one of the technical problems existing in the prior art; to this end, the present invention provides an SMA actuator that can effectively reduce wear and thus increase service life.

[0006] The present invention also provides a camera module having the SMA actuating device, and an electronic device having the camera module.

[0007] According to the first aspect of the present invention, the SMA actuator device includes an actuator part and a driven part; the actuator part includes an SMA wire, a support part, a first elastic part, a connecting rod and a second elastic part; the SMA wire can be contracted by electricity, and one end of the connecting rod is connected to the SMA wire; the first elastic part is arranged between the connecting rod and the support part, and the second elastic part is arranged at the other end of the connecting rod; the first elastic part and the second elastic part can be elastically bent; the driven part is connected to the second elastic part; the SMA wire can drive the connecting rod and the second elastic part to swing relative to the support part by contraction, and the second elastic part can drive the driven part to move.

[0008] The SMA actuator according to the first embodiment of the present invention has at least the following beneficial effects: by contracting the SMA wire to drive the connecting rod and the second elastic portion to swing, thereby driving the driven member to move, the displacement of the driven member can be greater than the contraction of the SMA wire, thereby achieving a larger stroke of the driven member while maintaining a relatively small SMA actuator, thereby facilitating miniaturization of the SMA actuator. Furthermore, the actuating portion is connected to the driven member via the second elastic portion. Since the second elastic portion is elastically deformable, when the driven member and the connecting rod undergo relative rotation or movement during the process of driving the driven member, the elastic deformation of the second elastic portion prevents relative movement between the portion of the actuating portion connected to the driven member and the driven member, thereby preventing wear between the portion and the driven member and thereby improving the service life of the actuator.

[0009] According to some embodiments of the present invention, the first elastic portion and the second elastic portion are bent elastic arms, which can be bent and deformed and can also provide good support for the connecting rod and the driven member.

[0010] According to some embodiments of the present invention, a connecting portion is provided at one end of the second elastic portion away from the connecting rod, and is connected to the driven member via the connecting portion. The provision of the connecting portion facilitates the connection between the driven member and the second elastic portion.

[0011] According to some embodiments of the present invention, the connecting portion is provided with a shaped hole, and the driven member is provided with a shaped protrusion that matches the shaped hole. The provision of the mutually matching shaped protrusion and shaped hole can further prevent relative rotation between the connecting portion and the driven member and wear.

[0012] According to some embodiments of the present invention, the support portion, first elastic portion, connecting rod, second elastic portion, and connecting portion collectively constitute an actuator, which is integrally formed from a conductive sheet. This integral molding reduces the manufacturing difficulty and cost of the SMA actuator. The conductive sheet allows the support portion, first elastic portion, and connecting rod to function as electrical conductors for the SMA wire, simplifying the overall circuit structure of the SMA actuator.

[0013] According to some embodiments of the present invention, there are two actuating bodies arranged symmetrically, and the two ends of the SMA wire are respectively connected to the two connecting rods. The two actuating bodies are arranged symmetrically to enhance the stability of the movement of the driven member.

[0014] A camera module according to an embodiment of the second aspect of the present invention includes the SMA actuator according to the first aspect of the present invention.

[0015] The camera module according to the second aspect of the present invention has at least the following beneficial effects: by adopting the above-mentioned SMA actuator, it is beneficial to achieve miniaturization of the camera module while ensuring a larger focusing range, and it is also beneficial to improve the service life of the camera module.

[0016] According to some embodiments of the present invention, the camera module further includes a lens assembly and a base. The lens assembly includes a frame body, a driven member integrally formed with the frame body or disposed on the frame body, a support portion fixedly connected to the base, and a movably connected frame body and base. An SMA actuator can drive the frame body to move relative to the base. A lens can be mounted on the frame body to achieve an imaging function, and the SMA actuator can drive the frame body to move to achieve a focusing or anti-shake function.

[0017] According to some embodiments of the present invention, an SMA actuator includes a first SMA actuator and a second SMA actuator. The SMA wire of the first SMA actuator is arranged between a connecting rod and a base, while the connecting rod of the second SMA actuator is arranged between the SMA wire and the base. The relative positions of the connecting rod, SMA wire, and base in the first and second SMA actuators are different. When the SMA wire is energized and contracts, it can drive the frame body in opposite directions, thereby driving the frame body to move in more directions, which helps expand the focus and anti-shake functions of the camera module.

[0018] An electronic device according to an embodiment of the third aspect of the present invention includes the camera module according to the second aspect of the present invention.

[0019] The electronic device according to the embodiment of the third aspect of the present invention has at least the following beneficial effects: by adopting the above-mentioned camera module, since an SMA actuator is provided in the camera module, it is beneficial to achieve the miniaturization of the camera module and the electronic device while ensuring a larger focusing range, and it is also beneficial to improve the service life of the camera module in the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 Schematic diagram of the structure of an SMA actuator according to an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the structure of a camera module according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the connection structure between the SMA actuator and the base according to an embodiment of the present invention;

[0024] Figure 4Schematic diagram of the structure of a lens assembly according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] SMA actuator 100, first SMA actuator 100a, second SMA actuator 100b, SMA wire 101, connecting rod 102, first elastic portion 103, supporting portion 104, second elastic portion 105, connecting portion 106, driven member 110, and special-shaped protrusion 111;

[0027] Lens assembly 200; frame body 201, first spring 202, second spring 203, second elastic arm 204

[0028] Base 300 , connecting column 301 , base body 302 . DETAILED DESCRIPTION

[0029] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, left, right, front, and back, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0031] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] Reference Figure 1The SMA actuator 100 of the first embodiment of the present invention is used to drive and adjust components such as camera modules in electronic devices. The SMA actuator 100 includes an actuating portion and a driven member 110. The actuating portion includes an SMA wire 101, a support portion 104, a first elastic portion 103, a connecting rod 102, and a second elastic portion 105. The SMA wire 101 is a shape memory alloy wire that can shrink in length before and after power is applied. One end of the connecting rod 102 is connected to the SMA wire 101. The first elastic portion 103 is disposed between the connecting rod 102 and the support portion 104, and the second elastic portion 105 is disposed at the other end of the connecting rod 102. The first elastic portion 103 and the second elastic portion 105 are elastically bendable. The driven member 110 is connected to the second elastic portion 105. The SMA wire 101 can shrink, causing the connecting rod 102 and the second elastic portion 105 to swing relative to the support portion 104, and the second elastic portion 105 can drive the driven member 110 to move.

[0034] The contraction of the SMA wire 101 drives the connecting rod 102 and the second elastic portion 105 to swing, thereby driving the driven member 110 to move. This allows the displacement of the driven member 110 to be greater than the contraction of the SMA wire 101. This allows for a larger stroke of the driven member 110 while maintaining a relatively small size of the SMA actuator 100, facilitating miniaturization of the SMA actuator 100. Furthermore, the actuating portion is connected to the driven member 110 via the second elastic portion 105. Since the second elastic portion 105 is elastically deformable, when the driven member 110 is driven to move, relative rotation or movement between the driven member 110 and the connecting rod 102 occurs. The elastic deformation of the second elastic portion 105 prevents relative movement between the portion of the actuating portion connected to the driven member 110 and the driven member 110, thereby preventing wear between the portion and the driven member 110 and thereby improving the service life.

[0035] According to some embodiments of the present invention, the first elastic portion 103 and the second elastic portion 105 are elastic arms arranged in a bent configuration. Furthermore, one end of the elastic arm constituting the first elastic portion 103 is connected to the support portion 104, and the other end is connected to the connecting rod 102; while one end of the elastic arm constituting the second elastic portion 105 is connected to the connecting rod 102, and the other end is connected to the driven member 110. The bent elastic arms can not only bend and deform the first elastic portion 103 and the second elastic portion 105, but can also provide good support for the connecting rod 102 and the driven member 110. Of course, depending on actual circumstances, in other embodiments of the present invention, the first elastic portion 103 and the second elastic portion 105 can also be made of other elastic structures or materials, such as bendable strip-shaped spring sheets.

[0036] According to some embodiments of the present invention, a connecting portion 106 is provided at one end of the second elastic portion 105 away from the connecting rod 102, and is connected to the driven member 110 via the connecting portion 106. The provision of the connecting portion 106 facilitates the connection between the driven member 110 and the second elastic portion 105. According to some embodiments of the present invention, specifically, the connecting portion 106 is provided with a shaped hole, and the driven member 110 is provided with a shaped protrusion 111 that matches the shaped hole. The shaped hole can be an elliptical hole, a rectangular hole, or a non-circular hole such as a triangular hole. The provision of the mutually matching shaped protrusion 111 and shaped hole further prevents relative rotation between the connecting portion 106 and the driven member 110, thereby preventing wear. Of course, depending on actual circumstances, in other embodiments of the present invention, the second elastic portion 105 can also be directly connected to the driven member 110, for example, by bonding or welding one end of the second elastic portion 105 to the driven member 110.

[0037] According to some embodiments of the present invention, the support portion 104, first elastic portion 103, connecting rod 102, second elastic portion 105, and connecting portion 106 collectively constitute the actuator body, which is integrally formed from a conductive sheet. This integral molding process helps reduce the manufacturing difficulty and cost of the actuator. The conductive sheet allows the support portion 104, first elastic portion 103, and connecting rod 102 to conduct electricity for the SMA wire 101, simplifying the overall circuit structure of the SMA actuator device 100. Specifically, the actuator body is integrally formed from a metal material, resulting in both excellent elasticity and electrical conductivity. Specifically, the actuator body can be integrally formed by stamping or etching.

[0038] According to some embodiments of the present invention, there are two actuators and they are symmetrically arranged. The two ends of the SMA wire 101 are respectively connected to two connecting rods 102. When contracting, the two symmetrically arranged connecting rods 102 can be driven simultaneously. Therefore, the two actuators are provided and are symmetrically arranged, which can enhance the stability of the movement of the driven member 110. Moreover, since the actuators are made of conductive plates, the input end of the SMA wire 101 can be directly formed through the two support parts 104, further simplifying the overall circuit structure of the SMA actuator device 100.

[0039] According to some embodiments of the present invention, two connecting portions 106 in the same SMA actuator 100 are respectively connected to two special-shaped protrusions 111 on the driven member 110, and the two connecting portions 106 are spaced apart from each other on the driven member 110, thereby preventing the SMA wire 101 from failing due to short circuit.

[0040] Of course, depending on practical circumstances, in other embodiments of the present invention, the two connecting portions 106 in the same SMA actuator 100 can also be configured to connect to the same special-shaped protrusion 111 on the driven component 110, and the two connecting portions 106 can be insulated by a spacer or isolation film, which can also prevent the problem of short circuit and failure of the two ends of the SMA wire 101. Regarding the spacer or isolation film, the spacer can be configured in an annular shape and nested with both connecting portions 106 on the special-shaped protrusion 111. The material of the spacer can be, but is not limited to, a plastic sheet. The isolation film can be configured as a thin film or coating wrapped around the end surface of the connecting portion 106. The isolation film can be, but is not limited to, a plastic film formed by dipping or an insulating coating formed by spraying.

[0041] Reference Figures 2 to 4 The camera module according to the second embodiment of the present invention includes the SMA actuator 100 according to the first embodiment of the present invention.

[0042] According to some embodiments of the present invention, a camera module further includes a lens assembly 200 and a base 300. The lens assembly 200 includes a frame body 201. The driven member 110 is integrally formed with the frame body 201 or disposed on the frame body 201. The support portion 104 is fixedly connected to the base 300. The frame body 201 and the base 300 are movably connected. The SMA actuator 100 can drive the frame body 201 to move relative to the base 300. A lens can be mounted on the frame body 201 to achieve an imaging function. The SMA actuator 100 can drive the frame body 201 to move, thereby achieving a focusing or anti-shake function.

[0043] According to some embodiments of the present invention, an SMA actuator 100 includes a first SMA actuator 100a and a second SMA actuator 100b. The SMA wire 101 of the first SMA actuator 100a is arranged between a connecting rod 102 and a base 300, while the connecting rod 102 of the second SMA actuator 100b is arranged between the SMA wire 101 and the base 300. The relative positions of the connecting rod 102, SMA wire 101, and base 300 in the first and second SMA actuators 100a, 100b are different. When the SMA wire 101 is energized and contracts, it can drive the frame body 201 in the opposite direction, thereby driving the frame body 201 to move in more directions, thereby facilitating the expansion of the camera module's focus and anti-shake functions.

[0044] Specifically, the difference between the first SMA actuation device 100a and the second SMA actuation device 100b is Figure 2 and Figure 3For comparison, when the SMA wire 101 contracts, the connecting rod 102 of the first SMA actuator 100a swings away from the base 300, thereby driving the frame body 201 away from the base 300. When the SMA wire 101 contracts, the connecting rod 102 of the second SMA actuator 100b swings toward the base 300, thereby driving the frame body 201 toward the base 300.

[0045] According to some embodiments of the present invention, each SMA actuator 100 surrounds the frame body 201. Furthermore, there are two first SMA actuators 100a arranged symmetrically about the frame body 201, and two second SMA actuators 100b arranged symmetrically about the frame body 201. The two first SMA actuators 100a and the two second SMA actuators 100b are symmetrically arranged about the frame body 201. By separately detecting or controlling each SMA actuator 100, the tilt angle and displacement of the frame body 201 can be detected or controlled, further expanding the functionality of the camera module.

[0046] According to some embodiments of the present invention, Figure 4 The lens assembly 200 further includes a spring, which is fixedly connected to the frame body 201. A plurality of second elastic arms 204 are disposed around the spring, one end of each of the second elastic arms 204 being connected to the base 300. The second elastic arms 204 support the frame body 201 and allow the frame body 201 to move relative to the base 300. Specifically, the spring includes a first spring 202 and a second spring 203, each of which is secured to opposite sides of the frame body 201. Of course, in other embodiments, the number of springs is not limited to two, and may be one or more, depending on practical circumstances.

[0047] According to some embodiments of the present invention, the first spring 202 and the second elastic arm 204 are integrally formed metal sheets, and the second spring 203 and the second elastic arm 204 are integrally formed metal sheets. The second elastic arm 204 allows the frame body 201 to be elastically suspended on the base 300, thereby facilitating actuation of the frame body 201 on each SMA actuator 100. The first spring 202 and the second spring 203 constitute the suspension system of the lens assembly 200. The first spring 202 and the second spring 203 herein do not refer to coil springs, volute springs, or leaf springs commonly found in the mechanical field, but rather to special-shaped springs specifically designed for suspending the lens assembly 200. The first spring 202 and the second spring 203 are thin sheets, attached to the frame body 201 from either side of the lens assembly 200.

[0048] According to some embodiments of the present invention, Figure 2 and Figure 3The base 300 includes a base body 302 and a connecting column 301. One end of the second spring 203 is connected to the base body 302. Four connecting columns 301 extending toward one side of the lens assembly 200 are provided at the four corners of the base body 302. One end of the second elastic arm 204 of the first spring 202 is connected to the top of the connecting column 301. The supporting parts 104 in the SMA actuator 100 are all connected to the connecting column 301, and the four SMA actuators 100 correspond to the four sides of the base 300 respectively.

[0049] The electronic device according to the third embodiment of the present invention includes the SMA actuator 100 according to the first embodiment of the present invention and the camera module according to the second embodiment of the present invention.

[0050] The following is combined with Figure 1 To the attached Figure 4 , the SMA actuator 100 of the first aspect, the camera module of the second aspect, and the electronic device of the third aspect of the present invention are described in the form of a specific embodiment.

[0051] The electronic device includes a camera module, which includes an SMA actuator 100 , a lens assembly 200 and a base 300 .

[0052] The SMA actuator 100 includes an actuator and a driven part 110; the actuator part includes an SMA wire 101, a support part 104, a first elastic part 103, a connecting rod 102 and a second elastic part 105; the SMA wire 101 refers to a shape memory alloy wire, which can shrink in length before and after power is applied, and one end of the connecting rod 102 is connected to the SMA wire 101; the first elastic part 103 is arranged between the connecting rod 102 and the support part 104, and the second elastic part 105 is arranged at the other end of the connecting rod 102; the first elastic part 103 and the second elastic part 105 can be elastically bent; the driven part 110 is connected to the second elastic part 105; the SMA wire 101 can drive the connecting rod 102 and the second elastic part 105 to swing relative to the support part 104 by shrinking, and the second elastic part 105 can drive the driven part 110 to move.

[0053] The first elastic portion 103 and the second elastic portion 105 are bent elastic arms, and one end of the elastic arm constituting the first elastic portion 103 is connected to the support portion 104, and the other end is connected to the connecting rod 102; while one end of the elastic arm constituting the second elastic portion 156 is connected to the connecting rod 102, and the other end is connected to the driven part 110.

[0054] A connecting portion 106 is provided at one end of the second elastic portion 105 away from the connecting rod 102 . The connecting portion 106 is provided with an elliptical special-shaped hole. The driven member 110 is provided with a special-shaped protrusion 111 that matches the special-shaped hole.

[0055] The support portion 104, first elastic portion 103, connecting rod 102, second elastic portion 105, and connecting portion 106 together constitute the actuator. The actuator is integrally formed by etching a conductive plate. There are two actuators, arranged symmetrically. The ends of the SMA wire 101 are connected to the two connecting rods 102, respectively. Contraction simultaneously drives the two symmetrically arranged connecting rods 102.

[0056] The two connecting portions 106 in the same SMA actuator 100 are respectively connected to the two special-shaped protrusions 111 on the driven member 110 , and the two connecting portions 106 are spaced apart from each other on the driven member 110 .

[0057] The lens assembly 200 includes a frame body 201, a driven member 110 disposed on the frame body 201, a support portion 104 fixedly connected to a base 300, and a movably connected frame body 201 and base 300. The SMA actuator 100 can drive the frame body 201 to move relative to the base 300. Lenses can be mounted on the frame body 201 to achieve imaging functions, and the SMA actuator 100 can drive the frame body 201 to move, thereby achieving focusing or anti-shake functions.

[0058] The SMA actuator 100 includes a first SMA actuator 100a and a second SMA actuator 100b. The SMA wire 101 of the first SMA actuator 100a is disposed between a connecting rod 102 and the base 300, while the connecting rod 102 of the second SMA actuator 100b is disposed between the SMA wire 101 and the base 300. When the SMA wire 101 contracts, the connecting rod 102 of the first SMA actuator 100a swings away from the base 300, thereby driving the frame body 201 away from the base 300. When the SMA wire 101 contracts, the connecting rod 102 of the second SMA actuator 100b swings toward the base 300, thereby driving the frame body 201 toward the base 300.

[0059] Each SMA actuator 100 surrounds the frame body 201. In addition, there are two first SMA actuators 100a and they are symmetrically arranged with respect to the frame body 201, and there are two second SMA actuators 100b and they are symmetrically arranged with respect to the frame body 201.

[0060] The lens assembly 200 also includes a spring, which includes a first spring 202 and a second spring 203. The first spring 202 and the second elastic arm 204 are integrally formed metal sheets. The first spring 202 and the second spring 203 are respectively adhered to the two sides of the frame body 201. A plurality of second elastic arms 204 are respectively provided around the first spring 202 and the second spring 203. One end of the second elastic arm 204 is connected to the base 300. The second elastic arm 204 enables the frame body 201 to form an elastic suspension state on the base 300 and enables the frame body 201 to be movable relative to the base 300.

[0061] The base 300 includes a base body 302 and a connecting post 301. One end of the second elastic arm 204 of the second spring 203 is connected to the base body 302. Four connecting posts 301 extending toward one side of the lens assembly 200 are provided at the four corners of the base body 302. One end of the second elastic arm 204 of the first spring 202 is connected to the top of the connecting post 301. The support parts 104 in the SMA actuator 100 are all connected to the connecting post 301, and the four SMA actuators 100 correspond to the four sides of the base 300 respectively.

[0062] The SMA actuator 100, camera module, and electronic device according to the embodiments of the present invention can achieve at least the following technical effects by being configured in this way:

[0063] The contraction of the SMA wire 101 drives the connecting rod 102 and the second elastic portion 105 to swing, thereby driving the driven member 110 to move. This allows the displacement of the driven member 110 to be greater than the contraction of the SMA wire 101. This allows for a larger stroke of the driven member 110 while maintaining a compact SMA actuator 100, facilitating miniaturization of the SMA actuator 100, the camera module, and the electronic device. Furthermore, the actuating portion is connected to the driven member 110 via the second elastic portion 105. Since the second elastic portion 105 is elastically deformable, when the driven member 110 is driven to move, relative rotation or relative movement between the driven member 110 and the connecting rod 102 occurs. The elastic deformation of the second elastic portion 105 prevents relative movement between the portion of the actuating portion connected to the driven member 110 and the driven member 110, thereby preventing wear between the portion and the driven member 110 and thereby extending the service life of the SMA actuator 100, the camera module, and the electronic device.

Claims

1. SMA actuator, characterized in that include: The actuating portion includes an SMA wire, a support portion, a first elastic portion, a connecting rod, and a second elastic portion; the SMA wire is electrically contractible, and one end of the connecting rod is connected to the SMA wire; the first elastic portion is disposed between the connecting rod and the support portion, and the second elastic portion is disposed at the other end of the connecting rod; the first elastic portion and the second elastic portion are elastic arms disposed in a bent manner and are elastically bendable; and one end of the elastic arm constituting the first elastic portion is connected to the support portion, and the other end is connected to the connecting rod; A driven part, the driven part is connected to the second elastic part; the SMA wire can drive the connecting rod and the second elastic part to swing relative to the supporting part by contraction, and the second elastic part can drive the driven part to move; one end of the elastic arm constituting the second elastic part is connected to the connecting rod, and the other end is connected to the driven part; the second elastic part is provided with a connecting part at one end away from the connecting rod, and is connected to the driven part through the connecting part; the connecting part is provided with a special-shaped hole, and the driven part is provided with a special-shaped protrusion matching the special-shaped hole.

2. The SMA actuator according to claim 1, wherein: The supporting portion, the first elastic portion, the connecting rod, the second elastic portion and the connecting portion together constitute an actuating body, and the actuating body is integrally formed by a conductive plate.

3. The SMA actuator according to claim 2, wherein: There are two actuating bodies and they are symmetrically arranged, and two ends of the SMA wire are respectively connected to the two connecting rods.

4. Camera module, characterized in that: A SMA actuator comprising the SMA actuator according to any one of claims 1 to 3.

5. The camera module according to claim 4, wherein: It also includes a lens assembly and a base, the lens assembly includes a frame body, the driven part is integrally formed with the frame body or is arranged on the frame body, the support part is fixedly connected to the base, the frame body and the base are movably connected, and the SMA actuator can drive the frame body to move relative to the base.

6. The camera module according to claim 5, wherein: The SMA actuator includes a first SMA actuator and a second SMA actuator. When the SMA wire is energized and contracts, the first SMA actuator and the second SMA actuator drive the frame body to move in opposite directions.

7. Electronic equipment, characterized in that: The camera module comprises the camera module according to any one of claims 4 to 6.

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