SMA actuator and lens driving device

Abstract

The present invention relates to an SMA actuator and a lens driving device. The SMA actuator has a driving rod and an SMA wire. The driving rod has a fixed end and a driving end, and the driving end is cantilevered. One end of the SMA wire is connected to the driving end of the driving rod, and the other end of the SMA wire is fixedly arranged. The SMA wire provides an actuating force to drive the driving end of the driving rod to deflect relative to the fixed end. The lens carrier of the lens driving device is supported by a suspension system in the installation space, and a plurality of SMA actuators are arranged on the periphery of the lens carrier to realize three-dimensional motion of the lens carrier. The SMA actuator of the present invention is small in size, simplifies the driving structure, and meets the requirements of product miniaturization. It is used in the lens driving device to realize the focusing of the lens and adjust the movement of the lens in the direction perpendicular to the optical axis. The optical image stabilization function is realized by adjusting the inclination angle of the lens, thereby improving the performance of the lens. The product has a light and small structure, is simple and accurate to control, and is suitable for popularization and utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of driving mechanisms, and in particular to a lens driving device. Background Art

[0002] With the advancement of science and technology, the application of camera modules is becoming more and more extensive. At present, in addition to cameras, mobile phones, computers and other electronic devices are equipped with camera modules to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives. Camera modules include fixed focal length (FF) camera modules and auto focus (AF) camera modules. In the auto focus (AF) camera module, the lens can be driven to move by a lens drive device (motor) to achieve focus. When taking pictures or videos, the lens cannot remain absolutely stable due to human shaking or other reasons, resulting in a certain offset. At this time, the focus and light intake of the camera will be affected, thereby affecting the quality of the image obtained by the camera. Generally, this lens deflection occurs in the direction perpendicular to the optical axis, and the auto focus motor can only drive the lens to move in the direction of the optical axis, so it cannot solve the problem caused by this type of lens deflection. To this end, an optical anti-shake actuator is added to the auto focus motor to drive the lens to move in two directions perpendicular to the optical axis, which can compensate for the above-mentioned deflection of the lens and help the camera obtain better image quality. A common optical image stabilization actuator is a miniature voice coil motor, which generates Lorentz magnetic force in a magnetic field by an energized coil to drive the lens to move. To achieve optical image stabilization, the lens needs to be driven in at least two directions, which means that multiple coils need to be arranged, which brings certain challenges to the miniaturization of the overall structure. In addition, the miniature voice coil motor not only has a complex structure and a large size, but also has a small optical image stabilization stroke, which is difficult to meet the needs and reduces the effectiveness of the image stabilization. Summary of the invention

[0003] The object of the present invention is to provide an SMA actuator, which is particularly suitable for constructing a lens driving device, realizing automatic focusing and anti-shake of a camera, and meeting the requirements of product miniaturization.

[0004] To achieve the above object, the SMA actuator proposed in the present invention has:

[0005] The driving rod has a fixed end and a driving end extending from the fixed end in one direction, and the driving end is cantilevered.

[0006] An SMA wire, one end of which is connected to the driving end of the driving rod, and the other end of which is fixedly arranged. The SMA wire provides an actuating force to drive the driving end of the driving rod to deflect relative to the fixed end.

[0007] The above scheme is further that the SMA wire is located on one side of the driving rod, and the axial direction of the SMA wire forms an angle with the extending direction of the driving end, and the angle is an acute angle, so that the SMA wire drives the driving end of the driving rod to deflect toward the side where the SMA wire is located.

[0008] The above solution is further that the fixed end is provided with a flexible portion, and the flexible portion cooperates with the driving end to deflect and provide resetting power.

[0009] The above solution is further that the driving end of the driving rod is provided with a protruding portion protruding toward the deflection side, and the protruding height of the protruding portion is higher than the point where the SMA wire is connected to the driving end.

[0010] In order to achieve the above object, the lens driving device proposed in the present invention has:

[0011] A lens carrier, which is supported by a suspension system in the installation space, and a plurality of SMA actuators are provided on the periphery of the lens carrier to enable the lens carrier to perform three-dimensional motion in the installation space;

[0012] The SMA actuator has:

[0013] The driving rod has a fixed end and a driving end extending from the fixed end in one direction, and the driving end is cantilevered.

[0014] An SMA wire, one end of which is connected to the driving end of the driving rod, and the other end of the SMA wire is fixedly arranged. The SMA wire provides an actuating force to drive the driving end of the driving rod to deflect relative to the fixed end, so that the driving end of the driving rod drives the lens carrier to move.

[0015] The above scheme is further that the lens carrier is a three-dimensional square shape, and an optical through hole is provided in the inner middle part of the lens carrier, and the optical through hole meets the requirements of lens assembly; the lens carrier has an upper side surface and a lower side surface distributed in the direction of the lens optical axis, and a front side surface, a rear side surface, a left side surface and a right side surface surrounding the direction of the lens optical axis, and a first group of SMA actuators is provided on the upper side surface, and the first group of SMA actuators has at least two SMA actuators, and the first group of SMA actuators drives the lens carrier to move along the lens optical axis toward the lower side surface; a second group of SMA actuators is provided on the lower side surface, and the second group of SMA actuators has at least two SMA actuators, and the second group of SMA actuators drives the lens carrier to move along the lens optical axis toward the upper side surface; a third group of SMA actuators is provided on the front side surface, and the third group of SMA actuators The actuator has at least one SMA actuator, and the third group of SMA actuators drives the lens carrier to move toward the rear of the rear side surface on a plane perpendicular to the lens optical axis; the rear side surface is provided with a fourth group of SMA actuators, and the fourth group of SMA actuators has at least one SMA actuator, and the fourth group of SMA actuators drives the lens carrier to move toward the front of the front side surface on a plane perpendicular to the lens optical axis; the left side surface is provided with a fifth group of SMA actuators, and the fifth group of SMA actuators has at least one SMA actuator, and the fifth group of SMA actuators drives the lens carrier to move toward the right side surface on a plane perpendicular to the lens optical axis; the right side surface is provided with a sixth group of SMA actuators, and the sixth group of SMA actuators has at least one SMA actuator, and the sixth group of SMA actuators drives the lens carrier to move toward the left side surface on a plane perpendicular to the lens optical axis.

[0016] The above scheme is further that the first group of SMA actuators and the second group of SMA actuators each have two SMA actuators, and the first group of SMA actuators and the second group of SMA actuators are arranged opposite to each other up and down; the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators each have one SMA actuator, and the third group of SMA actuators and the fourth group of SMA actuators are arranged opposite to each other front to back, and the fifth group of SMA actuators and the sixth group of SMA actuators are arranged opposite to each other left to right; the orthographic projections of the first group of SMA actuators, the second group of SMA actuators, the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators all fall on the sides of their respective arrangements; the driving ends of the driving rods of the two SMA actuators of the first group of SMA actuators extend in opposite directions, and the The driving ends of the driving rods of the two SMA actuators of the second group of SMA actuators extend in opposite directions and in opposite directions to the driving ends of the driving rods of the first group of SMA actuators which are opposite to each other in the vertical direction; the driving ends of the driving rods of the third group of SMA actuators and the fourth group of SMA actuators extend in opposite directions; the driving ends of the driving rods of the fifth group of SMA actuators and the sixth group of SMA actuators extend in opposite directions; the SMA wires of the first group of SMA actuators, the second group of SMA actuators, the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators are all located on the corresponding sides of the driving rods facing the lens carrier, and the axial direction of the SMA wire forms an angle with the extending direction of the driving end, which is an acute angle, so that the SMA wire drives the driving end of the driving rod to deflect toward the side where the SMA wire is located, so that the driving end of the driving rod drives the lens carrier to move.

[0017] The above solution is further that the fixed end is provided with a flexible portion, and the flexible portion cooperates with the driving end to deflect and provide resetting power.

[0018] The above solution is further that the driving end of the driving rod is provided with a protruding portion protruding toward the deflection side, and the protruding height of the protruding portion is higher than the point where the SMA wire is connected to the driving end.

[0019] The SMA actuator of the present invention has a driving rod and an SMA wire. The driving rod has a driving end extending from a fixed end in one direction, and the driving end is cantilevered. One end of the SMA wire is connected to the driving end of the driving rod, and the other end of the SMA wire is fixedly arranged. The SMA (Shape Memory Alloys) wire shrinks when heated to obtain an actuation function. The SMA actuator is small in size and effectively simplifies the driving structure, so as to meet the requirements of product miniaturization. It is used to make a lens driving device. A plurality of SMA actuators are arranged on the periphery of the lens carrier to realize the three-dimensional motion of the lens carrier in the installation space, and the lens focusing work and the adjustment of the lens movement in the direction perpendicular to the optical axis can be realized. Thus, the OIS (optical image stabilization) function is realized by adjusting the lens tilt angle, and the performance of the lens is improved. The product structure is lightweight and miniaturized, and the manufacturing cost is reduced. At the same time, the control is simple and accurate, and it is suitable for popularization and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 Schematic diagram of the structure of a preferred embodiment of the SMA actuator of the present invention;

[0021] Attached Figure 2 It is a structural schematic diagram of a preferred embodiment of the lens driving device of the present invention;

[0022] Attached Figure 3 for Figure 2 A schematic diagram of the top view of the structure of the embodiment;

[0023] Attached Figure 4 for Figure 2 A side structural schematic diagram of an embodiment. DETAILED DESCRIPTION

[0024] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0025] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] See also Figure 1The figure shows a schematic diagram of an SMA actuator proposed by the present invention, which has a driving rod 1 and an SMA wire 2. The driving rod 1 has a fixed end 11 and a driving end 12 extending from the fixed end in one direction, and the driving end 12 is cantilevered. One end of the SMA wire 2 is connected to the driving end 12 of the driving rod 1, and the other end of the SMA wire 2 is fixedly arranged. The SMA wire 2 provides an actuating force to drive the driving end 12 of the driving rod 1 to deflect relative to the fixed end, thereby obtaining an actuating force to achieve the movement of the corresponding components. The actuating function is obtained by utilizing the characteristic of the SMA (Shape Memory Alloys) wire that shrinks when heated. The actuator has a small size, is easy to control, has fewer transmission components, and effectively simplifies the driving structure, thereby meeting the requirements of product miniaturization.

[0027] See also Figure 1 As shown, in this embodiment, the SMA wire 2 is located on one side of the driving rod 1, and the axial direction of the SMA wire 2 forms an angle with the extending direction of the driving end 12, which is an acute angle, so that the SMA wire 2 drives the driving end 12 of the driving rod 1 to deflect toward the side where the SMA wire 2 is located. The driving end 12 of the driving rod 1 is provided with a protruding portion 121 protruding toward the deflection side. The protruding portion 121 in the figure is a raised arc made integrally with the driving rod 1. The protruding height of the protruding portion 121 is higher than the point where the SMA wire 2 connects to the driving end 12, thereby satisfying the SMA wire 2 pulling the driving end 12 to move, while avoiding interference with the SMA wire 2, and the driving end 12 forms a pushing-type action on the corresponding component to move the corresponding component. In this embodiment, in order to increase the actuation performance of the driving end 12, the fixed end 11 is provided with a flexible portion 13, which can be integrally manufactured or additionally assembled with the driving rod 1. The flexible portion 13 cooperates with the deflection of the driving end 12 and provides a reset force, so that the SMA actuator obtains the required actuation force in a limited space. The structure is simple, easy to manufacture and assemble, and meets the design concept of product miniaturization.

[0028] See also Figure 1 , 2, 3, and 4 show a lens driving device proposed by the present invention, which has a lens carrier 3, a driving rod 1, and an SMA wire 2. The lens carrier 3 matches the corresponding lens installation, and then the lens carrier 3 carries the lens in the installation space and is supported by the suspension system, thereby achieving the movement adjustment needs of the lens for taking photos or videos. The specific suspension system is the existing technology, such as using a spring body suspension, etc., which can ensure support and guide movement, and is not limited here. A plurality of SMA actuators are arranged on the periphery of the lens carrier 3 to realize the three-dimensional movement of the lens carrier 3 in the installation space to achieve optical focusing and anti-shake. The SMA actuator has a driving rod 1 and an SMA wire 2, and the driving rod 1 has a fixed end 11 and a driving end 12 extending from the fixed end in one direction, and the driving end 12 is cantilevered. One end of the SMA wire 2 is connected to the driving end 12 of the driving rod 1, and the other end of the SMA wire 2 is fixedly arranged. The SMA wire 2 provides an actuating force to drive the driving end 12 of the driving rod 1 to deflect relative to the fixed end, and obtains an actuating force, so that the driving end 12 of the driving rod 1 drives the lens carrier 3 to move. The actuation function is achieved by utilizing the heat-shrinking characteristics of SMA (Shape Memory Alloys) wires. It is small in size, easy to control, has fewer transmission parts, and effectively simplifies the drive structure, meeting the requirements for product miniaturization.

[0029] See also Figure 1 , 2As shown in Figures 3 and 4, the present embodiment is further characterized in that the lens carrier 3 is in a three-dimensional block shape, and an optical through hole 31 is provided in the inner middle of the lens carrier 3, and the optical through hole 31 satisfies the requirements of lens assembly and photographing or video recording. The lens carrier 3 has an upper side surface 32 and a lower side surface 33 distributed in the direction of the lens optical axis, and a front side surface 34, a rear side surface 35, a left side surface 36 and a right side surface 37 surrounding the direction of the lens optical axis. A first group of SMA actuators is provided on the upper side surface 32, and the first group of SMA actuators has at least two SMA actuators. The first group of SMA actuators drives the lens carrier 3 to move along the lens optical axis toward the lower side surface 33. A second group of SMA actuators is provided on the lower side surface 33, and the second group of SMA actuators has at least two SMA actuators. The second group of SMA actuators drives the lens carrier 3 to move along the lens optical axis toward the upper side surface 32. The front side surface 34 is provided with a third group of SMA actuators, the third group of SMA actuators having at least one SMA actuator, and the third group of SMA actuators drives the lens carrier 3 to move in the plane perpendicular to the lens optical axis toward the rear side surface 35. The rear side surface 35 is provided with a fourth group of SMA actuators, the fourth group of SMA actuators having at least one SMA actuator, and the fourth group of SMA actuators drives the lens carrier 3 to move in the plane perpendicular to the lens optical axis toward the front of the front side surface 34. The left side surface 36 is provided with a fifth group of SMA actuators, the fifth group of SMA actuators having at least one SMA actuator, and the fifth group of SMA actuators drives the lens carrier 3 to move in the plane perpendicular to the lens optical axis toward the right side surface 37. The right side surface 37 is provided with a sixth group of SMA actuators, the sixth group of SMA actuators having at least one SMA actuator, and the sixth group of SMA actuators drives the lens carrier 3 to move in the plane perpendicular to the lens optical axis toward the left side surface 36. This embodiment uses small SMA actuators to be arranged on the outer peripheral side of the lens carrier 3, thereby achieving the focusing movement of the lens carrier 3 on the lens optical axis and the movement of the lens carrier 3 in the direction perpendicular to the optical axis, thereby achieving the OIS (optical image stabilization) function by adjusting the lens tilt angle, and improving the performance of the lens. The product structure is lightweight and miniaturized, and the manufacturing cost is reduced. When working, the corresponding SMA actuator can be controlled according to the needs, and the control is simple and accurate, which is suitable for popularization and utilization.

[0030] See also Figure 1 , 2As shown in , 3, and 4, this embodiment is further that the first group of SMA actuators and the second group of SMA actuators each have two SMA actuators, and the first group of SMA actuators and the second group of SMA actuators are arranged vertically opposite to each other; the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators, and the sixth group of SMA actuators each have one SMA actuator, and the third group of SMA actuators and the fourth group of SMA actuators are arranged front to back oppositely, and the fifth group of SMA actuators and the sixth group of SMA actuators are arranged left to right oppositely. The orthographic projections of the first group of SMA actuators, the second group of SMA actuators, the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators, and the sixth group of SMA actuators all fall on the sides of their respective arrangements, effectively ensuring the product's external dimensions. The driving ends 12 of the driving rods 1 of the two SMA actuators of the first group of SMA actuators extend in opposite directions, and the driving ends 12 of the two SMA actuators of the second group of SMA actuators extend in opposite directions and in opposite directions to the driving ends 12 of the driving rods 1 of the first group of SMA actuators that are opposite to each other in the vertical direction. The driving ends 12 of the driving rods 1 of the third group of SMA actuators and the fourth group of SMA actuators extend in opposite directions; the driving ends 12 of the driving rods 1 of the fifth group of SMA actuators and the sixth group of SMA actuators extend in opposite directions. The above structural arrangement helps to improve the accuracy and stability of actuation, and is convenient for assembly and power-on control. The SMA wires 2 of the first group of SMA actuators, the second group of SMA actuators, the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators are all located on the corresponding side of the driving rod 1 facing the lens carrier 3, and the axial direction of the SMA wire 2 forms an angle with the extension direction of the driving end 12, which is an acute angle, so that the SMA wire 2 drives the driving end 12 of the driving rod 1 to deflect toward the side where the SMA wire 2 is located, so that the driving end 12 of the driving rod 1 drives the lens carrier 3 to move. This structure is convenient for the assembly of the driving rod 1, and the driving rod 1 effectively protects the inner SMA wire 2, and the product structure is simplified and small in size. In this embodiment, the driving end 12 has a side of a progressive bending side deflection movement when extending outward, so that the driving rod 1 forms a slightly curved arch to obtain a driving guide. The fixed end of the driving rod 1 and the SMA wire 2 can be fixed on the same body, or even on the same plane height of the same body, which is convenient for assembly. In this embodiment, the fixed end 11 is further provided with a flexible portion 13, which can be manufactured integrally with the driving rod 1 or obtained by additional assembly. The flexible portion 13 cooperates with the driving end 12 to deflect and provide a reset force, so that the SMA actuator obtains the required actuation force in a limited space. The structure is simple, easy to manufacture and assemble, and meets the design concept of product miniaturization.The driving end 12 of the driving rod 1 of this embodiment is provided with a protrusion 121 protruding toward the deflection side. The protrusion 121 in the figure is an arc-shaped protrusion made integrally with the driving rod 1. The protrusion 121 is higher than the point where the SMA wire 2 connects to the driving end 12, thereby satisfying the SMA wire 2 to pull the driving end 12 to move, while avoiding interference with the SMA wire 2, with high movement precision and accuracy. The driving end 12 forms a pushing-type lens carrier 3 to move the lens carrier 3. In this embodiment, the SMA wire 2 contracts when it is energized and heated, thereby obtaining an actuation function, thereby driving the lens carrier 3 to move. The electrical control part of the SMA wire 2 comes from the circuit part of the camera system. The power-on method and working principle are prior art and will not be repeated here.

[0031] The SMA actuator of the present invention has a driving rod and an SMA wire. The driving rod has a driving end extending from a fixed end in one direction, and the driving end is cantilevered. One end of the SMA wire is connected to the driving end of the driving rod, and the other end of the SMA wire is fixedly arranged. The SMA (Shape Memory Alloys) wire shrinks when heated to obtain an actuation function. The SMA actuator is small in size and effectively simplifies the driving structure, so as to meet the requirements of product miniaturization. It is used to make a lens driving device. A plurality of SMA actuators are arranged on the periphery of the lens carrier to realize the three-dimensional motion of the lens carrier in the installation space, and the lens focusing work and the adjustment of the lens movement in the direction perpendicular to the optical axis can be realized. Thus, the OIS (optical image stabilization) function is realized by adjusting the lens tilt angle, and the performance of the lens is improved. The product structure is lightweight and miniaturized, and the manufacturing cost is reduced. At the same time, the control is simple and accurate, and it is suitable for popularization and utilization.

[0032] Although the preferred specific embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention should not be limited to the structures and operations that are exactly the same as the above descriptions and drawings. For those skilled in the art, many equivalent improvements and changes can be made to the above embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, but these improvements and changes should all fall within the scope of protection required by the present invention.

Claims

1. A lens driving device, characterized in that: have: A lens carrier, which is supported by a suspension system in the installation space, and a plurality of SMA actuators are provided on the periphery of the lens carrier to enable the lens carrier to perform three-dimensional motion in the installation space; SMA actuators have: A driving rod, the driving rod having a fixed end and a driving end extending in one direction from the fixed end, the driving end being cantilevered, and having a side that is gradually bent toward a side deflection movement when the driving end extends outward, so that the driving rod forms a slight arch to obtain a driving guide; An SMA wire, one end of which is connected to the driving end of the driving rod, and the other end of the SMA wire is fixedly arranged, and the SMA wire provides an actuating force to drive the driving end of the driving rod to deflect relative to the fixed end, so that the driving end drives the lens carrier to move; The lens carrier is in the shape of a three-dimensional block, and an optical through hole is provided in the inner middle part of the lens carrier; the lens carrier has an upper side surface and a lower side surface distributed in the direction of the lens optical axis, and a front side surface, a rear side surface, a left side surface and a right side surface surrounding the direction of the lens optical axis; a first group of SMA actuators is provided on the upper side surface, and the first group of SMA actuators has at least two SMA actuators, and the first group of SMA actuators drives the lens carrier to move along the lens optical axis toward the lower side surface; a second group of SMA actuators is provided on the lower side surface, and the second group of SMA actuators has at least two SMA actuators, and the second group of SMA actuators drives the lens carrier to move along the lens optical axis toward the upper side surface; a third group of SMA actuators is provided on the front side surface, and the third group of SMA actuators has at least one SMA actuator The third group of SMA actuators drives the lens carrier to move toward the rear of the rear side surface on a plane perpendicular to the lens optical axis; the fourth group of SMA actuators is provided on the rear side surface, and the fourth group of SMA actuators has at least one SMA actuator, and the fourth group of SMA actuators drives the lens carrier to move toward the front of the front side surface on a plane perpendicular to the lens optical axis; the fifth group of SMA actuators is provided on the left side surface, and the fifth group of SMA actuators has at least one SMA actuator, and the fifth group of SMA actuators drives the lens carrier to move toward the right side surface on a plane perpendicular to the lens optical axis; the sixth group of SMA actuators is provided on the right side surface, and the sixth group of SMA actuators has at least one SMA actuator, and the sixth group of SMA actuators drives the lens carrier to move toward the left side surface on a plane perpendicular to the lens optical axis.

2. The lens driving device according to claim 1, characterized in that: The first group of SMA actuators and the second group of SMA actuators each have two SMA actuators, and the first group of SMA actuators and the second group of SMA actuators are arranged opposite to each other up and down; the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators each have one SMA actuator, and the third group of SMA actuators and the fourth group of SMA actuators are arranged opposite to each other front to back, and the fifth group of SMA actuators and the sixth group of SMA actuators are arranged opposite to each other left to right; the orthographic projections of the first group of SMA actuators, the second group of SMA actuators, the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators all fall on the sides of their respective arrangements; the driving ends of the driving rods of the two SMA actuators of the first group of SMA actuators extend in opposite directions, and the driving ends of the driving rods of the second group of SMA actuators extend in opposite directions. The driving ends of the two driving rods of the two SMA actuators of the A actuator extend in opposite directions and in opposite directions to the driving ends of the driving rods of the first group of SMA actuators which are opposite to each other in the vertical direction; the driving ends of the driving rods of the third group of SMA actuators and the fourth group of SMA actuators extend in opposite directions; the driving ends of the driving rods of the fifth group of SMA actuators and the sixth group of SMA actuators extend in opposite directions; the SMA wires of the first group of SMA actuators, the second group of SMA actuators, the third group of SMA actuators, the fourth group of SMA actuators, the fifth group of SMA actuators and the sixth group of SMA actuators are all located on the corresponding sides of the driving rods facing the lens carrier, and the axial direction of the SMA wire forms an angle with the extending direction of the driving end, which is an acute angle, so that the SMA wire drives the driving end of the driving rod to deflect toward the side where the SMA wire is located, so that the driving end of the driving rod drives the lens carrier to move.

3. The lens driving device according to claim 1, characterized in that: The fixed end is provided with a flexible portion, and the flexible portion cooperates with the driving end to deflect and provide resetting power.

4. The lens driving device according to claim 1 or 2, characterized in that: The driving end of the driving rod is provided with a protruding portion protruding toward the deflection side, and the protruding height of the protruding portion is higher than the point where the SMA wire is connected to the driving end.

5. SMA actuator, characterized in that, The SMA actuator is applied to the lens driving device according to any one of claims 1 to 4, and the SMA actuator has: The driving rod has a fixed end and a driving end extending from the fixed end in one direction, and the driving end is cantilevered. An SMA wire, one end of which is connected to the driving end of the driving rod, and the other end of which is fixedly arranged. The SMA wire provides an actuating force to drive the driving end of the driving rod to deflect relative to the fixed end.

6. The SMA actuator according to claim 5, characterized in that The SMA wire is located on one side of the driving rod, and the axial direction of the SMA wire forms an angle with the extending direction of the driving end, which is an acute angle, so that the SMA wire drives the driving end of the driving rod to deflect toward the side where the SMA wire is located.

7. The SMA actuator according to claim 5, characterized in that The fixed end is provided with a flexible portion, and the flexible portion cooperates with the driving end to deflect and provide resetting power.

8. The SMA actuator according to claim 5 or 6, characterized in that The driving end of the driving rod is provided with a protruding portion protruding toward the deflection side, and the protruding height of the protruding portion is higher than the point where the SMA wire is connected to the driving end.

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