Multi-axis optical image stabilization focusing device, camera module and electronic device

Abstract

The present invention provides a multi-axis optical anti-shake focusing device, including an SMA optical anti-shake actuator, including a movable plate, a first SMA line and a first elastic arm, the first SMA line drives the movable plate to move along the XY plane, the first elastic arm is in a "J"-shaped structure, one end of the first elastic arm is connected to the movable plate, the other end of the first elastic arm is connected to the substrate, and the first elastic arm is bent in the direction of the Z axis; an SMA upper actuator, the SMA upper actuator is connected to the movable plate, the SMA upper actuator includes a second SMA line and a driven part, the second SMA line drives the driven part to move along the Z axis; a frame body, the frame body is provided with a lens mounting hole, and the driven part is connected to the frame body. The SMA optical anti-shake actuator and the SMA upper actuator of the present invention realize compensation for the lens through the SMA line. The first elastic arm is bent in the Z axis direction, so that its rigidity along the Z axis becomes larger, no supporting components are required, friction is reduced, and the structure is simplified. In addition, the present invention also provides a camera module and an electronic device.

Description

Technical Field

[0001] The invention belongs to the field of camera anti-shake, and in particular relates to a multi-axis optical anti-shake focusing device, a camera module and an electronic device. Background Art

[0002] At present, cameras with auto-focus or anti-shake functions have been widely used in smart products such as mobile phones, cars, drones, and security surveillance. Ordinary miniature auto-focus cameras usually use voice coil motors to drive the lens to move up and down along the optical axis of the lens to achieve automatic focusing; however, during the process of taking photos or videos, the lens usually cannot maintain absolute balance due to the user's shaking, which will cause the lens to have a certain offset and deflection.

[0003] An existing optical image stabilization device includes an XY plane offset compensation device and a Z axis offset compensation device. The Z axis offset compensation device and the lens are arranged on the movable component of the XY plane offset compensation device. However, the rigidity of the movable component of the XY plane offset compensation device is difficult to support the lens and the Z axis offset compensation device, and a supporting component is often required for auxiliary support, which increases the friction between the movable component and the supporting component. In addition, the addition of the supporting component makes the structure of the optical image stabilization device complex and large in size.

[0004] Although the optical image stabilization device can help the camera obtain better image quality to a great extent, it can only compensate for the position offset in three mutually perpendicular axial directions: X-axis, Y-axis, and Z-axis (optical axis), but it is difficult to more effectively eliminate the influence of lens deflection. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a multi-axis optical image stabilization focusing device, which does not require support components, can reduce friction, and simplifies the structure of the multi-axis optical image stabilization focusing device, making the multi-axis optical image stabilization focusing device miniaturized.

[0006] The present invention also provides a camera module having the multi-axis optical anti-shake focusing device. The camera module can effectively achieve lens anti-shake, compensate for lens shooting, and improve shooting quality.

[0007] The present invention also provides an electronic device having the multi-axis optical anti-shake focusing device or the camera module, which can effectively achieve lens anti-shake and improve shooting quality.

[0008] According to the first aspect of the present invention, a multi-axis optical image stabilization focusing device includes an SMA optical image stabilization actuator, wherein the SMA optical image stabilization actuator includes a movable plate, a first elastic arm and a first SMA wire, the first SMA wire can drive the movable plate to move along the XY plane when it is energized and contracted, the first elastic arm is in a "J"-shaped structure, one end of the first elastic arm is connected to the movable plate, the other end of the first elastic arm is connected to a substrate, and the first elastic arm is bent in the direction of the Z axis; an SMA upper actuator, wherein the SMA upper actuator is connected to the movable plate, the SMA upper actuator includes a second SMA wire and a driven component, the second SMA wire can drive the driven component to move along the Z axis when it is energized and contracted; a frame body, wherein a lens mounting hole with an axis parallel to the Z axis is provided at the center of the frame body, and the driven component is connected to the frame body.

[0009] The multi-axis optical image stabilization focusing device according to the embodiment of the present invention has at least the following beneficial effects: the SMA optical image stabilization actuator and the SMA upper actuator of the present invention respectively generate driving force through the contraction of the first SMA wire and the second SMA wire to drive the frame body to achieve compensation of the offset. At the same time, the first elastic arm is in a "J"-shaped structure, one end of the first elastic arm is connected to the movable plate, and the other end is connected to the base plate. The first elastic arm is bent in the direction of the Z axis. The "J"-shaped first elastic arm can provide space for the movement of the movable plate along the XY plane, so that the multi-axis optical image stabilization focusing device of the present invention can compensate for the axial offset on the X axis and the Y axis. After the first elastic arm is bent, the rigidity of the first elastic arm along the Z axis direction becomes larger, which can effectively support the frame body, without the need to set a supporting component, can reduce friction, simplify the structure of the multi-axis optical image stabilization focusing device, and is conducive to the miniaturization of the multi-axis optical image stabilization device.

[0010] According to some embodiments of the present invention, the bending points on both sides of the first elastic arm may be at the same or different position heights.

[0011] According to some embodiments of the present invention, at least two SMA upper actuators are provided. This solution provides multiple SMA upper actuators, which can control the offset of the driven member. When the movement of the driven member along the Z axis is inconsistent, the frame body can be rotated to compensate for the influence caused by the lens deflection and improve the imaging quality.

[0012] According to some embodiments of the present invention, a fixing block is protruded from the base plate, and the first elastic arm is fixedly mounted on the fixing block.

[0013] According to some embodiments of the present invention, the multi-axis optical image stabilization focusing device also includes a circuit board, which is electrically connected to the SMA upper actuator and is arranged between the movable plate and the frame body.

[0014] According to some embodiments of the present invention, a position sensor for detecting the position and inclination of the frame body and / or a controller for adjusting the position and inclination of the frame body is provided on the circuit board. This solution uses the position sensor to feedback the offset and deflection inclination of the frame body and the lens in the Z-axis direction, and the controller can control the SMA upper actuator to adjust according to the information of the position sensor to compensate the frame body.

[0015] According to some embodiments of the present invention, the SMA optical image stabilization actuator further includes a fixed plate, which is mounted on the substrate and located between the movable plate and the substrate.

[0016] According to some embodiments of the present invention, a first touch pad is provided on a group of diagonals of the fixed plate, a second touch pad is provided on another group of diagonals of the movable plate, and two ends of the first SMA wire are respectively connected to the first touch pad and the second touch pad, and are correspondingly provided on the four sides of the movable plate.

[0017] A camera module according to an embodiment of a second aspect of the present invention comprises a multi-axis optical image stabilization focusing device according to an embodiment of the first aspect of the present invention.

[0018] The camera module according to the embodiment of the present invention has at least the following beneficial effects: the camera module of the present invention can realize lens offset compensation and improve shooting quality through the SMA optical image stabilization actuator and the SMA wire of the SMA upper actuator.

[0019] An electronic device according to an embodiment of a third aspect of the present invention comprises the multi-axis optical image stabilization focusing device according to an embodiment of the first aspect of the present invention or comprises a camera module according to an embodiment of the second aspect of the present invention.

[0020] The electronic device according to the embodiment of the present invention has at least the following beneficial effects: the electronic device of the present invention is provided with the camera module as described above or the multi-axis optical image stabilization focusing device as described above, and can realize lens offset compensation and improve shooting quality through the SMA optical image stabilization actuator and the SMA wire of the SMA upper actuator.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 It is a schematic diagram of the exploded structure of the multi-axis optical image stabilization focusing device of the present invention.

[0024] Figure 2 It is a schematic structural diagram of the SMA optical image stabilization actuator of the present invention.

[0025] Figure 3 It is a schematic structural diagram of the substrate of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the SMA upper actuator, the frame body, the spring and the movable seat of the present invention.

[0027] Figure 5 This is a schematic structural diagram of the SMA upper actuator of the present invention without the driven member.

[0028] Figure 6 It is a structural schematic diagram of the movable seat of the present invention.

[0029] Figure 7 It is a schematic structural diagram of the frame body and spring of the present invention.

[0030] Figure 8 It is a schematic diagram of the structure of the circuit board of the present invention.

[0031] Reference numerals:

[0032] The SMA optical image stabilization actuator 100 , the fixed plate 110 , the movable plate 120 , the first SMA wire 130 , the first elastic arm 121 , the connecting piece 121 a , the elastic middle part 121 b , the first touch panel 111 , and the second touch panel 122 .

[0033] The SMA upper actuator 200, the driven member 210, the hinge column 211, the second SMA wire 220, the actuating body 230, the connecting rod 231, the supporting portion 232, the second elastic arm 233, the first SMA upper actuator 200a, and the second SMA upper actuator 200b.

[0034] Frame body 300 and lens mounting hole 310 .

[0035] Base plate 400 and fixing block 410 .

[0036] Movable seat 500 and connecting column 510 .

[0037] Spring 600 and third elastic arm 610 .

[0038] Circuit board 700 , third touch panel 710 , controller 720 .

[0039] Cover body 800. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present invention, it is necessary to understand that descriptions involving orientations, such as up, down, front, back, outside, inside, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and 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, and therefore cannot be understood as a limitation on the present invention.

[0042] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used 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.

[0043] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0044] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are first described in detail with reference to the accompanying drawings.

[0045] refer to Figures 1 to 8 The present invention provides a camera module, including a multi-axis optical anti-shake focusing device. The multi-axis optical anti-shake focusing device and the camera module can also be applied to electronic devices.

[0046] Please refer to Figures 1 to 3The present invention provides a multi-axis optical image stabilization focusing device, comprising an SMA optical image stabilization actuator 100, an SMA upper actuator 200, a frame body 300 and a substrate 400. The SMA optical image stabilization actuator 100 comprises a movable plate 120, a first elastic arm 121 and a first SMA wire 130, the SMA upper actuator 200 comprises a driven member 210 and a second SMA wire 220, and a lens mounting hole 310 whose axis is parallel to the Z axis is provided at the center of the frame body 300, and a lens can be mounted in the lens mounting hole 310. The first SMA wire 130 contracts when energized to drive the movable plate 120 to move along the XY plane, and the first elastic arm 121 is in a "J"-shaped structure, with one end of the first elastic arm 121 connected to the movable plate 120, and the other end of the first elastic arm 121 connected to the substrate 400, and the first elastic arm 121 is bent in the direction of the Z axis; the SMA upper actuator 200 is connected to the movable plate 120, and the driven component 210 is connected to the frame body 300. The second SMA wire 220 contracts when energized to drive the driven component 210 to move along the Z axis, and the frame body 300 moves with the movement of the driven component 210. When the first SMA wire 130 contracts, the movable plate 120 can drive the SMA upper actuator 200 to move, and drive the frame body 300 to move through the driven member 210, so as to adjust the position of the lens on the X-axis and Y-axis planes, and compensate for the offset of the axial position of the X-axis and Y-axis; when the second SMA wire 220 contracts and the contraction degree is consistent, it drives the driven member 210 to move along the Z-axis direction, and drives the frame body 300 to move through the driven member 210, so as to adjust the position of the lens on the Z-axis, and compensate for the offset of the axial position of the Z-axis. The offset of the axial position of the lens is compensated by the power-on contraction of the first SMA wire 130 and the second SMA wire 220. At the same time, the "J"-shaped structure can provide space for the movable plate 120 to move along the XY plane, ensuring that the offset of the axial position of the lens on the X-axis and Y-axis can be compensated. The first elastic arm 121 is bent in the direction of the Z-axis. Since the first elastic arm 121 is relatively short and can increase the rigidity of the movable plate 120 in the Z-axis direction after bending, it can effectively support the frame body 300 without setting a supporting component. The friction between the movable plate 120 and the supporting component can also be avoided, and the structure of the multi-axis optical image stabilization focusing device of the present invention can be simplified.

[0047] In this embodiment, more specifically, the first elastic arm 121 includes a connecting piece 121a and an elastic middle part 121b, the elastic middle part 121b is in a "J"-shaped structure, one end of the elastic middle part 121b is connected to the connecting piece 121a, the other end of the elastic middle part 121b is connected to the movable plate 120, the connecting piece 121a is connected to the substrate 400, and the elastic middle part 121b is bent in the direction of the Z axis. In order to facilitate the connection between the first elastic arm 121 and the substrate 400, a fixing block 410 is provided on the substrate 400, the fixing block 410 corresponds to the connecting piece 121a one by one, and the connecting piece 121a is fixedly installed on the fixing block 410, which can increase the connection area between the substrate 400 and the first elastic arm 121, so that the connection between the substrate 400 and the first elastic arm is more secure.

[0048] In this embodiment, the first elastic arm 121 and the movable plate 120 are integrally formed.

[0049] In the present embodiment, the first SMA wire 130 and the second SMA wire 220 are both SMA (Shape Memory Alloys) wires, which refer to shape memory alloy wires, and can achieve length expansion and contraction before and after power is supplied.

[0050] Please refer to Figure 1 and Figure 2 The SMA optical image stabilization actuator 100 further includes a fixed plate 110 , two ends of the first SMA wire 130 are respectively connected to the fixed plate 110 and the movable plate 120 , the fixed plate 110 is mounted on the substrate 400 , and the fixed plate 110 is located between the movable plate 120 and the substrate 400 . By bending the elastic middle portion 121b of the first elastic arm 121 in the direction of the Z-axis, the rigidity of the movable plate 120 in the Z-axis direction can be increased, and the frame body 300 can be effectively supported. The frame body 300 can be suspended on the fixed plate 110, and the movable plate 120 and the fixed plate 110 are suspended in the air. Since the rigidity of the movable plate 120 in the Z-axis direction is sufficient, there is no need to set a supporting component between the movable plate 120 and the fixed plate 110, which can reduce the friction between the supporting component and the movable plate 120. At the same time, since the movable plate 120 and the fixed plate 110 are suspended in the air, the friction between the movable plate 120 and the fixed plate 110 can also be reduced, and the structure of the multi-axis optical image stabilization focusing device of the present invention can be simplified.

[0051] More specifically, a first touch panel 111 is disposed on a group of diagonal corners of the fixed plate 110, a second touch panel 122 is disposed on another group of diagonal corners of the movable plate 120, and the number of first SMA wires 130 is 4, and both ends of each first SMA wire 130 are respectively connected to the first touch panel 111 and the second touch panel 122, and are correspondingly disposed on the four sides of the movable plate 120, surrounding the movable plate 120. When any one of the first SMA wires 130 is energized and contracted, the movable plate 120 can be moved in four directions, namely, the positive direction of the X-axis, the negative direction of the X-axis, the positive direction of the Y-axis, and the negative direction of the Y-axis, respectively, so as to adjust the offset of the axial position of the lens on the X-axis and the Y-axis.

[0052] Please continue to refer to Figure 1 and Figure 2 Preferably, the first elastic arm 121 is bent at an angle of 90° toward the Z axis, that is, the elastic middle portion 121b is bent at an angle of 90° toward the Z axis. After bending, the elastic middle portion 121b is parallel to the Z axis, and the elastic middle portion 121b is perpendicular to the movable plate 120. In this embodiment, the bending points on both sides of the elastic middle portion 121b of the first elastic arm 121 are at the same position height. After bending, the connecting piece 121a and the movable plate 120 are in the same plane. Of course, the bending points on both sides of the elastic middle part 121b of the first elastic arm 121 can be at different position heights. After being bent twice at different positions, the connecting piece 121a and the movable plate 120 are on different planes. Regardless of whether the connecting piece 121a and the movable plate 120 are on the same plane, the movable plate 120 can be moved along the XY plane under the action of the first SMA wire 130. At the same time, it can ensure that the rigidity in the Z-axis direction is sufficient to support the SMA upper actuator 200, the frame body 300 and the lens without adding supporting components.

[0053] In order to simplify the overall circuit, the movable plate 120 is preferably made of a conductive metal material, and the movable plate 120 has a certain degree of elasticity.

[0054] Please refer to Figure 1 , Figure 4 and Figure 5Each SMA upper actuator 200 further includes two actuating bodies 230, wherein the actuating body 230 includes a connecting rod 231, a supporting portion 232 and a second elastic arm 233. Specifically, a protruding hinge column 211 is provided on the driven member 210, the inner side of one end of the connecting rod 231 is connected to the second SMA wire 220, the outer side of the same end of the connecting rod 231 is connected to the second elastic arm 233, and the other end of the connecting rod 231 is provided with a hinge ring, which is sleeved on the hinge column 211 to form a hinge mechanism; the inner side of one end of the connecting rod 231 of the other actuating body 230 is connected to the other end of the second SMA wire 220, the outer side of the same end of the connecting rod 231 is connected to the second elastic arm 233, and the other end of the connecting rod 231 is sleeved on the hinge column 211 to form a hinge mechanism. The second SMA wire 220 and the two connecting rods 231 form a triangle. The second elastic arm 233 is disposed on the support portion 232, and the other side of the end of the connecting rod 231 connected to the second SMA wire 220 is connected to the second elastic arm 233. The second elastic arm 233 can be elastically bent, so that when the second SMA wire 220 is energized and contracted, it can drive the connecting rod 231 to swing up and down relative to the support portion 232 (i.e., move along the Z-axis direction), and the driven member 210 moves along the Z-axis direction with the movement of the connecting rod 231 to adjust the position of the lens in the Z-axis direction. The second SMA wire 220 and the two connecting rods 231 form a triangular structure, and through the action of the second elastic arm 233, the displacement of the driven member 210 can be greater than the contraction of the second SMA wire 220, so that a larger adjustment stroke can be achieved under the condition that the volume of the SMA upper actuator 200 is small, which is conducive to the miniaturization of the entire multi-axis optical image stabilization focusing device, and the two actuators 230 are symmetrically arranged, which can enhance the stability of the movement of the driven member 210.

[0055] Specifically, the second elastic arm 233 is made of an elastic material and can bend when the second SMA wire 220 contracts. The second elastic arm 233 is a strip-shaped structure, one side of the second elastic arm 233 is connected to the support portion 232 and the other side of the second elastic arm 233 is connected to the connecting rod 231. The connecting rod 231 is a rod-shaped structure with a certain inductance, which is sufficient to support the displacement of the driven member 210, the frame body 300, the lens and other components. In this embodiment, the connecting rod 231, the support portion 232 and the second elastic arm 233 are integrally formed and are all conductive materials. The integral forming is conducive to reducing the manufacturing difficulty and cost of the SMA upper actuator 200, and the conductive material can conduct electricity for the second SMA wire 220, which is conducive to simplifying the overall circuit structure.

[0056] In this embodiment, there are two hinged posts 211, and the two connecting rods 231 of the two actuating bodies 230 are respectively connected to the two hinged posts 211. Of course, only one hinged post 211 may be provided, and the hinge rings of the two connecting rods 231 are sleeved on the same hinged post 211, and the two connecting rods 231 are insulated from each other at the hinged position by a spacer to avoid short circuit.

[0057] Please continue to refer to Figure 1 , Figure 4 as well as Figure 5 , the number of the SMA upper actuators 200 is at least 2. In this embodiment, the number of the SMA upper actuators 200 is 4. Correspondingly, the number of the driven members 210 is also 4. Each driven member 210 is evenly distributed around the central axis of the lens mounting hole 310. The SMA upper actuator 200 is divided into a first SMA upper actuator 200a and a second SMA upper actuator 200b. The connecting rod 231 of the first SMA upper actuator 200a is located between the second SMA wire 220 and the movable plate 120, while the second SMA wire 220 of the second SMA upper actuator 200b is located between the connecting rod 231 and the movable plate 120. The two first SMA upper actuators 200a are arranged opposite to each other, and the two second SMA upper actuators 200b are arranged opposite to each other, that is, the first SMA upper actuator 200a and the second SMA upper actuator 200b are arranged symmetrically with respect to the frame body 300, and respectively control the frame body 300 and the lens to realize the rotation control around the X-axis and the Y-axis. Taking the rotation control around the X-axis direction as an example, when it is necessary to control the lens to rotate around the X-axis, the two SMA upper actuators 200 whose connecting line of the driven parts 210 is parallel to the X-axis do not move, and the other two SMA upper actuators 200 (the connecting line of the driven parts 210 of the SMA diagonal actuators 200 is perpendicular to the X-axis) drive the driven parts 210 to produce different Z-axis displacements. Thus, the frame body 300 and the lens are rotated around the X-axis; taking the rotation control around the Y-axis as an example, when the lens needs to be controlled to rotate around the Y-axis, the two SMA upper actuators 200 whose driven parts 210 are connected parallel to the Y-axis do not move, and the other two SMA upper actuators 200 (the connecting line of the driven parts 210 of the SMA diagonal actuators 200 is perpendicular to the Y-axis) drive the driven parts 210 to produce different Z-axis displacements. Thus, the frame body 300 and the lens are rotated around the Y-axis; and when only the displacement in the Z-axis direction is required, the first SMA upper actuator 200a or the second SMA upper actuator 200b is driven respectively, so that the first SMA upper actuator 200a (or the second SMA upper actuator 200b) produces the same Z-axis displacement, that is, the frame body 300 and the lens can be moved along the negative direction of the Z-axis or the positive direction of the Z-axis.

[0058] Please refer to Figure 6 and Figure 7The multi-axis optical image stabilization focusing device also includes a movable seat 500 and a spring 600. The movable seat 500 is connected to the movable plate 120. The SMA upper actuator 200 is connected to the movable seat 500. The frame body 300 is fixedly connected to the spring 600. The spring 600 is provided with a third elastic arm 610. One end of the third elastic arm 610 is connected to the movable seat 500. The third elastic arm 610 enables the spring 600 to support the frame body 300 and enable the frame body 300 to be movable relative to the movable seat 500.

[0059] Specifically, the upper and lower surfaces of the frame body 300 are fixedly connected to the spring 600, that is, the upper and lower surfaces of the frame body 300 are provided with a third elastic arm 610, and the four corners of the movable seat 500 are provided with connecting columns 510 extending toward one side of the frame body 300, and the supporting parts 232 of the SMA upper actuator 200 are connected to the side of the connecting column 510, the third elastic arm 610 connected to the upper surface of the frame body 300 is connected to the top of the connecting column 510, and the third elastic arm 610 connected to the lower surface of the frame body 300 is connected to the bottom of the movable seat 500.

[0060] In this embodiment, two springs 600 are provided, and they are respectively attached to the upper and lower surfaces of the frame body 300. The spring 600 and the third elastic arm 610 are integrally formed metal sheets. The third elastic arm 610 enables the frame body 300 to form an elastic suspension state on the movable seat 500, so that the frame body 300 can easily compensate for axial displacement and deflection under the drive of each SMA upper actuator 200.

[0061] Please refer to Figure 1 and Figure 8 The multi-axis optical image stabilization focusing device further includes a circuit board 700, which is mounted on the movable plate 120 and is located between the movable plate 120 and the frame body 300. More specifically, the circuit board 700 is located between the movable plate 120 and the movable seat 500. The circuit board 700 is electrically connected to the SMA upper actuator 200. A third touch panel 710 is provided on the circuit board 700. The third touch panel 710 passes through the substrate 400, so that the third touch panel 710 is located outside the entire multi-axis optical image stabilization focusing device, which is convenient for electrical connection with an external circuit, and can realize the connection between each SMA upper actuator 200 and an external control circuit, making the overall circuit structure simpler, which is conducive to the miniaturization and low cost of the multi-axis optical image stabilization focusing device. In this embodiment, the circuit board 700 is preferably an FPC circuit board.

[0062] In order to facilitate the detection of the position and inclination of the frame body 300 and to adjust and compensate for the position and inclination of the frame body 300, a controller 720 and a position sensor (not shown) are provided on the circuit board 700. The position sensor can be used to feedback the position of the frame body 300 and the lens in the Z-axis direction and the inclination around the X-axis and Y-axis. The controller 720 can be used to control the SMA upper actuator 200 to drive the frame body 300 to move according to the position and inclination detected by the position sensor, and to perform corresponding compensation. In this embodiment, the number of controllers 720 is 4, and they are evenly arranged on the circuit board 700. Of course, the number of controllers 720 and position sensors can be adjusted accordingly according to cost requirements and volume requirements, and their specific arrangement positions can also be adjusted as needed.

[0063] In this embodiment, the position sensor is a Hall sensor, and magnets are provided at positions of the frame body 300 corresponding to each position sensor, so that the position and inclination of the frame body 300 and the lens can be known by detecting changes in the magnetic field through the Hall sensor.

[0064] Please refer to Figure 1 In this embodiment, the multi-axis optical image stabilization focusing device further comprises a cover 800, which is covered on the substrate 400 and forms a receiving cavity, in which the SMA optical image stabilization actuator 100, the SMA upper actuator 200, the frame body 300, the movable seat 500, the spring 600 and the circuit board 700 are all placed, and a through hole is provided at the top of the cover 800 at a position corresponding to the lens mounting hole 310. The multi-axis optical image stabilization focusing device of the present invention can form an integral structure through the substrate 400 and the cover 800.

[0065] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A multi-axis optical image stabilization focusing device, It is characterized in that include: An SMA optical image stabilization actuator, the SMA optical image stabilization actuator comprising a movable plate, a first elastic arm and a first SMA wire, the first SMA wire being energized and contracted to drive the movable plate to move along the XY plane, the first elastic arm being in a "J"-shaped structure, one end of the first elastic arm being connected to the movable plate, the other end of the first elastic arm being connected to a substrate, and the first elastic arm being bent in the direction of the Z axis; the first elastic arm comprising a connecting piece and an elastic middle part, the connecting piece being connected to the substrate, the elastic middle part being in a "J"-shaped structure, one end of the elastic middle part being connected to the connecting piece, the other end of the elastic middle part being connected to the movable plate, and the elastic middle part being bent in the direction of the Z axis; An SMA upper actuator, wherein the SMA upper actuator is connected to the movable plate, and the SMA upper actuator comprises a second SMA wire and a driven member, and the second SMA wire can drive the driven member to move along the Z-axis direction when it is electrified and contracted; A frame body, wherein a lens mounting hole with an axis parallel to the Z axis is arranged at the center of the frame body, and the driven component is connected to the frame body.

2. The multi-axis optical image stabilization focusing device according to claim 1, It is characterized in that The bending points on both sides of the first elastic arm may be at the same or different position heights.

3. The multi-axis optical image stabilization focusing device according to claim 1, It is characterized in that At least two SMA upper actuators are provided.

4. The multi-axis optical image stabilization focusing device according to claim 1, It is characterized in that A fixing block is protruded from the base plate, and the first elastic arm is fixedly mounted on the fixing block.

5. The multi-axis optical image stabilization focusing device according to claim 1, It is characterized in that It also includes a circuit board, which is electrically connected to the SMA upper actuator and is arranged between the movable plate and the frame body.

6. The multi-axis optical image stabilization focusing device according to claim 5, It is characterized in that The circuit board is provided with a position sensor for detecting the position and inclination of the frame body and / or a controller for adjusting the position and inclination of the frame body.

7. The multi-axis optical image stabilization focusing device according to claim 1, It is characterized in that The SMA optical image stabilization actuator further includes a fixed plate, which is mounted on the substrate and located between the movable plate and the substrate.

8. The multi-axis optical image stabilization focusing device according to claim 7, It is characterized in that A first touch pad is arranged on one set of diagonal corners of the fixed plate, a second touch pad is arranged on another set of diagonal corners of the movable plate, and two ends of the first SMA wire are respectively connected to the first touch pad and the second touch pad and are correspondingly arranged on four sides of the movable plate.

9. A camera module, It is characterized in that It comprises a multi-axis optical image stabilization focusing device as described in any one of claims 1 to 8.

10. An electronic device, It is characterized in that It comprises the multi-axis optical image stabilization focusing device as described in any one of claims 1 to 8 or the camera module as described in claim 9.

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