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

Abstract

The invention discloses a multi-axis optical image stabilization and focusing device, a camera module and an electronic device. The multi-axis optical image stabilization and focusing device comprises: an SMA optical image stabilization actuator, comprising a fixed plate, a movable plate, and a first SMA wire connecting the fixed plate and the movable plate; an upper SMA actuator, connected to the movable plate, and comprising a second SMA wire and a driven part, and the second SMA wire can drive the driven part to move along the Z axis when it is energized and contracted; at least two upper SMA actuators are provided; and a frame body, each driven part is connected to the frame body. By providing at least two upper SMA actuators to drive different driven parts on the frame body to move along the Z axis, the frame body can be rotated, so that the multi-axis optical image stabilization and focusing device can also compensate for the influence of lens deflection by rotation, thereby improving the imaging quality.

Description

Technical Field

[0001] The present invention relates to the technical field of camera anti-shake, and in particular to a multi-axis optical anti-shake and 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 user shaking, which will cause the lens to have a certain offset and deflection.

[0003] In order to improve the above-mentioned problem, an optical image stabilization device has been developed. Based on the autofocus voice coil motor, an optical image stabilization brake is added, which can drive the autofocus voice coil motor and the lens to move on a plane perpendicular to the optical axis of the lens, so as to drive the lens to move in two directions perpendicular to the optical axis to compensate for the above-mentioned deviation. Although this optical image stabilization device can help the camera to obtain better image quality to a great extent, it can only compensate for the deviation in three axial positions of the mutually perpendicular X-axis, Y-axis, and Z-axis (optical axis), and it is difficult to more effectively eliminate the influence of lens deflection.

[0004] In addition, since the above-mentioned optical image stabilization device adopts an autofocus voice coil motor, and the autofocus voice coil motor drives the lens to move through the Lorentz force generated by the energized coil in the magnetic field, and the camera module usually also has sensors and other electronic components, the electromagnetic interference generated by the energized coil and magnetic field in the voice coil motor will affect the normal operation of other electronic components to a certain extent. Summary of the invention

[0005] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a multi-axis optical image stabilization and focusing device, a camera module and an electronic device that can eliminate the influence of lens deflection and improve imaging quality.

[0006] The technical solutions adopted to solve the above technical problems are:

[0007] A multi-axis optical image stabilization and focusing device, comprising: an SMA optical image stabilization actuator, comprising a fixed plate, a movable plate, and a first SMA wire connecting the fixed plate and the movable plate, wherein the first SMA wire can drive the movable plate to move in the XY plane when it is energized and contracted; an upper SMA actuator, connected to the movable plate and comprising a second SMA wire and a driven component, wherein the second SMA wire can drive the driven component to move along the Z axis when it is energized and contracted; at least two upper SMA actuators are provided; and a frame body, wherein a lens mounting hole with an axis parallel to the Z axis is provided at the center, and each of the driven components is connected to the frame body.

[0008] The multi-axis optical image stabilization and focusing device has at least the following beneficial effects:

[0009] Both the SMA optical image stabilization actuator and the upper SMA actuator generate a driving force through the contraction of the SMA wire to drive the movement of the frame body, and will not generate electromagnetic interference to affect the normal operation of other electronic components; and by setting at least two upper SMA actuators to drive different driven parts on the frame body to move along the Z axis, when the movement of the driven parts along the Z axis is consistent, the entire frame body can be compensated for the Z-direction movement, and when the movement of the driven parts along the Z axis is inconsistent, the frame body can be rotated, so that the multi-axis optical image stabilization and focusing device can also compensate for the influence of lens deflection by rotation, thereby improving the imaging quality.

[0010] In a possible implementation manner of the present invention, the driven parts are evenly distributed around the central axis of the lens mounting hole. By evenly distributing around the central axis of the lens mounting hole, the position and distance between each driven part and the center of the lens can be consistent, thereby facilitating the control and adjustment of each upper SMA actuator.

[0011] In a possible embodiment of the present invention, the upper SMA actuator further includes two actuating bodies, each of which includes a connecting rod, a support portion, and a first elastic arm, one end of the connecting rod is connected to the second SMA wire, one end of the connecting rod is elastically connected to the support portion, the first elastic arm is arranged between the connecting rod and the support portion, the first elastic arm can be elastically bent, one end of the connecting rod is hinged to the driven member, the second SMA wire can drive the connecting rod to swing relative to the support portion by contraction, and the connecting rod can drive the driven member to move along the Z axis. The first elastic arm allows the connecting rod to elastically swing relative to the support portion, so that the displacement of the driven member and the focus ring can be greater than the contraction of the second SMA wire, thereby achieving a larger adjustment stroke under the condition that the upper SMA actuator is small in size, which is conducive to the miniaturization of the entire multi-axis optical image stabilization and focusing device.

[0012] In a possible implementation of the present invention, a movable seat and a spring are further included, wherein the movable seat is connected to the movable plate, the upper SMA actuator is connected to the movable seat, the spring is fixedly connected to the frame body, the spring is provided with a plurality of second elastic arms, one end of the second elastic arm is connected to the movable seat, and the second elastic arm enables the spring to support the frame body and enable the frame body to move relative to the movable seat. The frame body can be elastically suspended on the movable seat by the second elastic arms, so that the frame body is easier to drive relative to each upper SMA actuator.

[0013] In a possible implementation of the present invention, a position sensor for detecting the position and inclination of the frame body or a controller integrated with a position sensor is provided on the movable plate. The position sensor is used to feedback the offset amount and deflection inclination angle of the frame body and the lens in the Z direction, so as to facilitate the acquisition of the displacement amount and rotation angle that the upper SMA actuator needs to drive the frame body to adjust and compensate.

[0014] In a possible implementation manner of the present invention, a magnet is provided on the frame body at a position corresponding to the position sensor or controller, so that the position and inclination angle of the frame body and the lens can be known by detecting changes in the magnetic field through the position sensor.

[0015] In a possible implementation of the present invention, the movable plate is movably mounted on a fixed plate, the fixed plate is fixed on a base plate, a third elastic arm is provided at the edge of the movable plate, a free end of the third elastic arm is fixed to the fixed plate, and the movable plate can move relative to the fixed plate under the constraint of the third elastic arm; the two ends of the first SMA wire are respectively connected to the fixed plate and the movable plate. By providing the third elastic arm and mounting the movable plate above the fixed plate, the movable plate can be moved in the XY plane above the fixed plate by electrifying and contracting the second SMA wire.

[0016] In a possible implementation 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, a total of four first SMA wires are provided and correspond to the four sides of the movable plate respectively, and the two ends of the first SMA wire are connected to the first touch pad and the second touch pad respectively. The first touch pad and the second touch pad are provided to facilitate the connection between the fixed plate, the movable plate and the first SMA wire, and by providing four second SMA wires, two of the second SMA wires parallel to the X-axis can respectively drive the movable plate to move in the positive and reverse directions of the X-axis, and two of the second SMA wires parallel to the Y-axis can respectively drive the movable plate to move in the positive and reverse directions of the Y-axis, thereby facilitating the expansion of the focus and anti-shake functions of the multi-axis optical anti-shake and focus device.

[0017] A camera module, characterized by comprising the above-mentioned multi-axis optical image stabilization and focusing device.

[0018] An electronic device comprises the above-mentioned multi-axis optical image stabilization and focusing device or the above-mentioned camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 It is a schematic diagram of the exploded structure of a multi-axis optical image stabilization and focusing device according to an embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the structure of an SMA optical image stabilization actuator according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the connection structure of the upper SMA actuator, the frame body, the spring and the base according to an embodiment of the present invention;

[0023] Figure 4 It is a schematic structural diagram of the upper SMA actuator of an embodiment of the present invention after the driven member is removed;

[0024] Figure 5 A schematic structural diagram of a base according to an embodiment of the present invention;

[0025] Figure 6 It is a schematic diagram of the connection structure between the frame body and the spring of the present invention.

[0026] Reference numerals:

[0027] The SMA optical image stabilization actuator 1 , the fixed plate 110 , the first touch panel 111 , the movable plate 120 , the third elastic arm 121 , the position sensor 122 , the second touch panel 123 , and the first SMA wire 130 .

[0028] The upper SMA actuator 2 , the first upper SMA actuator 20 a , the second upper SMA actuator 20 b , the second SMA wire 210 , the driven member 220 , the hinge column 221 , the actuating portion 230 , the supporting portion 231 , the connecting rod 232 , and the first elastic arm 233 .

[0029] Mirror frame body 3, lens mounting hole 310, embedding groove 320;

[0030] Movable seat 4, connecting column 410;

[0031] Spring 5, second elastic arm 510;

[0032] Base plate 6 and cover 7 . DETAILED DESCRIPTION

[0033] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying 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 should not be understood as a limitation on the present invention.

[0035] 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.

[0036] 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.

[0037] Reference Figures 1 to 6 The camera module described in the present invention includes the multi-axis optical image stabilization and focusing device described in the present invention.

[0038] A multi-axis optical image stabilization and focusing device comprises a frame body 3, an SMA optical image stabilization actuator 1 and at least two upper SMA actuators 2.

[0039] The SMA optical image stabilization actuator 1 includes a fixed plate 110 , a movable plate 120 , and a first SMA wire 130 connecting the fixed plate 110 and the movable plate 120 . The first SMA wire 130 contracts when energized to drive the movable plate 120 to move in the XY plane.

[0040] The upper SMA actuator 2 is connected to the movable plate 120 and includes a second SMA wire 210 and a driven member 220. When the second SMA wire 210 is energized and contracts, it can drive the driven member 220 to move along the Z axis.

[0041] The frame body 3 is provided with a lens mounting hole 310 at the center, the axis of which is parallel to the Z axis. The lens can be installed in the lens mounting hole 310, so that the optical axis of the lens is parallel to the Z axis under normal circumstances; each of the driven components 220 is connected to the frame body 3.

[0042] The multi-axis optical image stabilization and focusing device has at least the following beneficial effects:

[0043] Both the SMA optical image stabilization actuator 1 and the upper SMA actuator 2 generate a driving force through the contraction of the SMA wire to drive the frame body 3 to move, and will not generate electromagnetic interference to affect the normal operation of other electronic components; and by setting at least two upper SMA actuators 2 to drive different driven parts 220 on the frame body 3 to move along the Z axis, when the movement amount of the driven parts 220 along the Z axis is consistent, the entire frame body 3 can be compensated for the Z-direction movement, and when the movement amount of the driven parts 220 along the Z axis is inconsistent, the frame body 3 can be rotated, so that the multi-axis optical image stabilization and focusing device can also compensate for the influence of lens deflection by rotation, thereby improving the imaging quality.

[0044] Reference Figure 1 and Figure 2 Regarding the fixed plate 110, the fixed plate 110 is fixedly connected to the substrate 6, and the movable plate 120 is placed above the fixed plate 110. The movable plate 120 is movable relative to the fixed plate 110, and 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.

[0045] Reference Figure 3 Regarding the driven member 220, the driven member 220 may be formed together with the frame body 3 or fixedly connected to the frame body 3. In the present embodiment, preferably, the driven member 220 is formed integrally with the frame body 3.

[0046] Regarding the first SMA wire 130 and the second SMA wire 210 , the SMA wire refers to a shape memory alloy wire, which can achieve length contraction before and after power is supplied.

[0047] In an embodiment, the driven members 220 are evenly distributed around the central axis of the lens mounting hole 310. By evenly distributing around the central axis of the lens mounting hole 310, the position and distance between each driven member 220 and the center of the lens can be consistent, thereby facilitating control and adjustment of each upper SMA actuator 2.

[0048] Reference Figure 4The upper SMA actuator 2 also includes two actuating bodies 230, each of which includes a connecting rod 232, a supporting portion 231 and a first elastic arm 233. One end of the connecting rod 232 is connected to the second SMA wire 210, and one end of the connecting rod 232 is elastically connected to the supporting portion 231. The first elastic arm 233 is arranged between the connecting rod 232 and the supporting portion 231. The first elastic arm 233 can be elastically bent, and one end of the connecting rod 232 is hinged to the driven member 220. The second SMA wire 210 can drive the connecting rod 232 to swing relative to the supporting portion 231 by contraction, and the connecting rod 232 can drive the driven member 220 to move along the Z axis. The first elastic arm 233 allows the connecting rod 232 to swing elastically relative to the supporting portion 231, so that the displacement of the driven member 220 and the focus ring can be greater than the contraction of the second SMA wire 210, thereby achieving a larger adjustment stroke under the condition of a smaller volume of the upper SMA actuator 2, which is beneficial to the miniaturization of the entire multi-axis optical image stabilization and focusing device.

[0049] Regarding the first elastic arm 233 , the first elastic arm 233 is made of elastic material and can bend when the second SMA wire 210 contracts. The first elastic arm 233 is in a strip shape, one end of the first elastic arm 233 is connected to the support portion 231 and the other end is connected to the connecting rod 232 .

[0050] Regarding the connecting rod 232, the connecting rod 232 is a rod with a certain rigidity, which can support the displacement of the driven member 220 and the frame body 3.

[0051] In this embodiment, the support portion 231, the first elastic arm 233 and the connecting rod 232 are integrally formed by a conductive material. The integral formation of the support portion 231, the first elastic arm 233 and the connecting rod 232 is conducive to reducing the manufacturing difficulty and cost of the upper SMA actuator 2. The conductive material allows the support portion 231, the first elastic arm 233 and the connecting rod 232 to be conductive for the SMA wire, which is conducive to simplifying the overall circuit structure of the multi-axis optical image stabilization and focusing device.

[0052] Regarding the support portion 231 , the first elastic arm 233 and the connecting rod 232 , the support portion 231 , the first elastic arm 233 and the connecting rod 232 are integrally formed by metal material, and have both good elasticity and electrical conductivity.

[0053] In this embodiment, the two actuating bodies 230 in the same upper SMA actuator 2 are symmetrically arranged. The symmetrical arrangement of the supporting portion 231 , the first elastic arm 233 and the connecting rod 232 can enhance the stability of the movement of the driven member 220 .

[0054] Regarding the driven member 220, a protruding hinge column 221 is provided on the driven member 220, and a hinge ring is provided at one end of the connecting rod 232, and the hinge ring is sleeved on the hinge column 221 to form a hinge mechanism. In this embodiment, two hinge columns 221 are provided, and the two connecting rods 232 in the same upper SMA actuator 2 are respectively hinged to the two hinge columns 221. Of course, according to actual conditions, in some other embodiments, only one hinge column 221 can be selected on the driven member 220, and the two connecting rods 232 in the same upper SMA actuator 2 are both hinged to the hinge column 221, and the two connecting rods 232 are mutually insulated by a spacer at the hinged position.

[0055] In the present embodiment, specifically, the number of the upper SMA actuators 2 is 4, and two opposite upper SMA actuators 2 form a group, thereby being divided into two groups, respectively corresponding to controlling the frame body 3 and the lens to realize rotation control around the X-axis and the Y-axis; for example, taking the rotation control around the X-axis as an example, when it is necessary to control the lens to rotate around the X-axis, the two upper SMA actuators 2 whose connecting line of the driven member 220 is parallel to the X-axis do not move, while the other two upper SMA actuators 2 drive the driven member 220 to generate different Z-axis displacements, thereby causing the frame body 3 and the lens to rotate around the X-axis; and when only the Z-direction displacement is required, the four upper SMA actuators 2 are started at the same time, and the displacement of each driven member 220 is made consistent.

[0056] Of course, according to actual conditions, in some other embodiments, the number of upper SMA actuators 2 may be 2, 3 or 4 or more. For example, when only 2 upper SMA actuators 2 are used, it is difficult to achieve rotation around the X-axis and the Y-axis at the same time, but it is suitable to achieve rotation compensation and anti-shake around the X-axis or the Y-axis. When 3 upper SMA actuators 2 are used, the three upper SMA actuators 2 need to work together to synthesize the rotation around the X-axis or the Y-axis, which is not very convenient to control. And setting more than 4 upper SMA actuators 2 is likely to increase the cost.

[0057] Furthermore, in the present embodiment, the upper SMA actuator 2 is divided into a first upper SMA actuator 20a and a second upper SMA actuator 20b, the second SMA wire 210 of the first upper SMA actuator 20a is arranged between the connecting rod 232 and the movable plate 120, and the connecting rod 232 of the second upper SMA actuator 20b is arranged between the second SMA wire 210 and the movable plate 120. The multi-axis optical image stabilization and focusing device comprises at least one first upper SMA actuator 20a and at least one second upper SMA actuator 20b. Since the relative positions of the connecting rod 232, the second SMA wire 210 and the movable plate 120 in the first upper SMA actuator 20a and the second upper SMA actuator 20b are different, the frame body 3 can be driven in opposite directions, and the frame body 3 can be driven to move in more directions, which is beneficial to expand the focusing and image stabilization functions of the multi-axis optical image stabilization and focusing device.

[0058] Regarding the upper SMA actuators 2 , preferably, each upper SMA actuator 2 surrounds the frame body 3 .

[0059] In this embodiment, preferably, the number of the first upper SMA actuators 20a is two and they are symmetrically arranged about the frame body 3, and the number of the second upper SMA actuators 20b is two and they are symmetrically arranged about the frame body 3. The two first upper SMA actuators 20a and the two second upper SMA actuators 20b are respectively arranged symmetrically about the frame body 3, and by controlling each upper SMA actuator 2 respectively, the inclination and displacement of the frame body 3 and the lens can be detected or controlled, which is conducive to further expanding the anti-shake and focus functions of the camera module.

[0060] Regarding the first upper SMA actuator 20a and the second upper SMA actuator 20b, the difference between the two is Figure 1 , Figure 4 and Figure 5 When the second SMA wire 210 contracts, the connecting rod 232 of the first upper SMA actuator 20a swings away from the movable plate 120, thereby driving the frame body 3 away from the movable plate 120. When the second SMA wire 210 contracts, the connecting rod 232 of the second upper SMA actuator 20b swings toward the movable plate 120, thereby driving the frame body 3 toward the movable frame.

[0061] The multi-axis optical image stabilization and focusing device also includes a movable seat 4 and a spring 5, wherein the movable seat 4 is connected to the movable plate 120, the upper SMA actuator 2 is connected to the movable seat 4, the spring 5 is fixedly connected to the frame body 3, the spring 5 is provided with a plurality of second elastic arms 510, one end of the second elastic arm 510 is connected to the movable seat 4, and the second elastic arm 510 enables the spring 5 to support the frame body 3 and enable the frame body 3 to be movable relative to the movable seat 4.

[0062] As for the spring 5, there are two springs 5, which are respectively attached to the upper and lower surfaces of the frame body 3. The spring 5 and the second elastic arm 510 are integrally formed metal sheets. The second elastic arm 510 enables the frame body 3 to form an elastic suspension state on the movable seat 4, so that the frame body 3 is easy to drive on each upper SMA actuator 2. The spring 5 here does not refer to the common spiral spring 5, volute spring 5 or leaf spring 5 in the mechanical field, but a special-shaped spring 5 specifically used to suspend the frame body 3.

[0063] Regarding the movable seat 4, four connecting columns 410 extending toward one side of the frame body 3 are provided at the four corners of the movable seat 4, the supporting parts 231 in the upper SMA actuator 2 are connected to the side of the connecting column 410, and the second elastic arm 510 connected to the upper surface of the frame body 3 is connected to the top of the connecting column 410.

[0064] In this embodiment, a position sensor 122 for detecting the position and inclination of the frame body 3 is provided on the movable plate 120. Of course, according to actual conditions, in some other embodiments, a controller with an integrated position sensor 122 may be provided on the movable plate 120. The position sensor 122 is used to feedback the offset amount and the deflection inclination angle of the frame body 3 and the lens in the Z direction, so as to facilitate the acquisition of the displacement amount and the rotation angle that the upper SMA actuator 2 needs to drive the frame body 3 to adjust and compensate.

[0065] In this embodiment, regarding the position sensor 122, a magnet is disposed at the position of the frame body 3 corresponding to the position sensor, so that the position and inclination angle of the frame body 3 and the lens are known by detecting the change of the magnetic field by the position sensor 122. Of course, according to actual conditions, in some other embodiments, such as providing a controller integrated with the position sensor 122, a magnet is disposed at the position of the frame body 3 corresponding to the controller.

[0066] Regarding the frame body 3, an embedding groove 320 facing the position sensor 122 is opened on the frame body 3, and the magnet is installed in the embedding groove 320. There are multiple position sensors 122 and magnets, and preferably four are set in this embodiment.

[0067] In this embodiment, the movable plate 120 is movably mounted on the fixed plate 110, the fixed plate 110 is fixed on the base plate 6, a third elastic arm 121 is provided at the edge of the movable plate 120, the free end of the third elastic arm 121 is fixed on the fixed plate 110, and the movable plate 120 can move relative to the fixed plate 110 under the constraint of the third elastic arm 121; the two ends of the first SMA wire 130 are respectively connected to the fixed plate 110 and the movable plate 120. By providing the elastic arm and mounting the movable plate 120 above the fixed plate 110, the movable plate 120 can be moved in the XY plane above the fixed plate 110 by electrifying and contracting the second SMA wire 210.

[0068] In this embodiment, in order to reduce the friction between the movable plate 120 and the fixed plate 110 , preferably, a plurality of support bearings are arranged between the movable plate 120 and the fixed plate 110 .

[0069] In this embodiment, a first touch panel 111 is provided on a group of diagonal portions of the fixed plate 110, and a second touch panel 123 is provided on another group of diagonal portions of the movable plate 120. A total of four first SMA wires 130 are provided and correspond to the four sides of the movable plate 120, respectively. The two ends of the first SMA wire 130 are connected to the first touch panel 111 and the second touch panel 123, respectively. The first touch panel 111 and the second touch panel 123 are provided to facilitate the connection between the fixed plate 110, the movable plate 120 and the first SMA wire 130, and by providing four second SMA wires 210, two of the second SMA wires 210 parallel to the X-axis can respectively drive the movable plate 120 to move in the positive and reverse directions of the X-axis, and two of the second SMA wires 210 parallel to the Y-axis can respectively drive the movable plate 120 to move in the positive and reverse directions of the Y-axis, thereby facilitating the expansion of the focus and anti-shake functions of the multi-axis optical anti-shake and focus device.

[0070] Of course, according to actual needs, in some other embodiments, the number of the first SMA wires 130 may be 1, 2, 3 or more than 4.

[0071] In this embodiment, the multi-axis optical image stabilization and focusing device further comprises a substrate 6 and a cover 7, the cover 7 is covered on the substrate 6 and forms a receiving cavity, the frame body 3, the SMA optical image stabilization actuator 1, the upper SMA actuator 2, the movable seat 4, etc. are all placed in the receiving cavity, and a through hole is provided at the top of the cover 7 corresponding to the position of the lens mounting hole 310. By providing the substrate 6 and the cover 7, the multi-axis optical image stabilization and focusing device can constitute an integrated module.

[0072] The multi-axis optical image stabilization and focusing device and the camera module in this technical solution can be used in electronic equipment.

Claims

1. A multi-axis optical image stabilization and focusing device, characterized in that: include: The SMA optical image stabilization actuator comprises a fixed plate, a movable plate, and a first SMA wire connecting the fixed plate and the movable plate, wherein the first SMA wire contracts when energized to drive the movable plate to move in the XY plane; The upper SMA actuator is connected to the movable plate and includes a second SMA wire and a driven member, wherein the second SMA wire is energized and contracted to drive the driven member to move along the Z axis; A lens frame body, the center of which is provided with a lens mounting hole whose axis is parallel to the Z axis, and each of the driven components is connected to the lens frame body; There are four upper SMA actuators, and two upper SMA actuators facing each other form a group, which are divided into a first upper SMA actuator and a second upper SMA actuator, so as to be divided into two groups to respectively control the frame body 3 and the lens to realize the rotation control around the X-axis and the Y-axis; when it is necessary to control the lens to rotate around the X-axis, the two upper SMA actuators whose driven parts are connected in parallel to the X-axis do not move, while the other two upper SMA actuators drive the driven parts to generate different Z-axis displacements, so that the frame body and the lens rotate around the X-axis; and when only the Z-direction displacement is required, the four upper SMA actuators are started at the same time, and the displacement of each driven part is made consistent; Wherein, each upper SMA actuator includes an actuating body, and the actuating body includes a connecting rod, a supporting part and a first elastic arm, one end of the connecting rod is connected to the second SMA wire, one end of the connecting rod is elastically connected to the supporting part, the first elastic arm is arranged between the connecting rod and the supporting part, and the first elastic arm can be elastically bent; a protruding hinge column is provided on the driven part, one end of the connecting rod is provided with a hinge ring, the hinge ring is sleeved on the hinge column to form a hinge mechanism, and two hinge columns are provided, the two connecting rods in the same upper SMA actuator are respectively hinged to the two hinge columns, the second SMA wire can drive the connecting rod to swing relative to the supporting part by contraction, and the connecting rod can drive the driven part to move along the Z axis; and the second SMA wire of the first upper SMA actuator is arranged between the connecting rod and the movable plate, and the connecting rod of the second upper SMA actuator is arranged between the second SMA wire and the movable plate.

2. The multi-axis optical image stabilization and focusing device according to claim 1, characterized in that: The driven parts are evenly distributed around the central axis of the lens mounting hole.

3. The multi-axis optical image stabilization and focusing device according to claim 1, characterized in that: It also includes a movable seat and a spring, wherein the movable seat is connected to the movable plate, the upper SMA actuator is connected to the movable seat, the spring is fixedly connected to the frame body, the spring is provided with a plurality of second elastic arms, one end of the second elastic arm is connected to the movable seat, and the second elastic arm enables the spring to support the frame body and make the frame body movable relative to the movable seat.

4. The multi-axis optical image stabilization and focusing device according to any one of claims 1 to 3, characterized in that: The movable plate is provided with a position sensor for detecting the position and inclination of the frame body or a controller integrated with a position sensor.

5. The multi-axis optical image stabilization and focusing device according to claim 4, characterized in that: The frame body is provided with a magnet at a position corresponding to the position sensor or the controller.

6. The multi-axis optical image stabilization and focusing device according to any one of claims 1 to 3, characterized in that: The movable plate is movably mounted on a fixed plate, the fixed plate is fixed on a base plate, a third elastic arm is provided at an edge of the movable plate, a free end of the third elastic arm is fixed to the fixed plate, the movable plate can move relative to the fixed plate under the constraint of the third elastic arm, and two ends of the first SMA wire are respectively connected to the fixed plate and the movable plate.

7. The multi-axis optical image stabilization and focusing device according to claim 6, characterized in that: A first touch pad is arranged on a group of diagonals of the fixed plate, and a second touch pad is arranged on another group of diagonals of the movable plate. A total of four first SMA wires are arranged and correspond to four sides of the movable plate respectively. Two ends of the first SMA wire are connected to the first touch pad and the second touch pad respectively.

8. A camera module, characterized in that: A multi-axis optical image stabilization and focusing device comprising any one of claims 1 to 7.

9. An electronic device, characterized in that: A multi-axis optical image stabilization and focusing device comprising any one of claims 1 to 7 or a camera module comprising the camera module according to claim 8.

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