Focusing device, assembling method and lens system

Abstract

The invention relates to the field of camera modules, and provides a focusing device, an assembling method and a lens system.The focusing device comprises a base, a supporting piece, a carrier and two traction wires; the carrier is positioned right above the base; a lens is arranged in the carrier, the carrier is used for adjusting the focusing position of the lens when moving relative to the base in the optical axis direction, and the optical axis direction is perpendicular to the top end face of the base. The bottom end of the supporting piece is connected to the top end of the base. The supporting pieces are distributed around the carrier; each traction wire is provided with two tail sections and a middle section; the middle section is positioned between the two tail sections; the traction wire is made of a shape memory material; the tail section is fixedly connected with the top end of the support; the tail section is electrically connected with the power supply unit; the power supply unit is used for loading current to the traction wire; the middle section is connected with the carrier; when the current on the traction wire changes, the traction wire is stretched or shortened so as to drive the carrier to move relative to the base. The focusing device is used for simplifying the structure of the focusing device so as to reduce the difficulty of assembling and driving an algorithm.

Description

Technical Field

[0001] The present invention relates to the field of camera modules, and in particular to a focusing device, an assembly method and a lens system. Background Art

[0002] In the related technology, the camera module uses shape memory alloy (SMA) motors, which use current to control the expansion and contraction of SMA wires to achieve optical focus and anti-shake functions. Since SMA wires occupy a small volume and have high energy density, they can effectively reduce the volume of the camera module, so they have been widely studied. The current SMA motor requires up to 8 SMA wires to achieve stable drive, which has the problems of high difficulty in assembly and high difficulty in driving algorithm control.

[0003] Therefore, there is an urgent need for a focusing device, an assembly method and a lens system to improve the above problems. Summary of the invention

[0004] An object of the present invention is to provide a focusing device, an assembly method and a lens system, wherein the focusing device is used to simplify the structure of the focusing device to reduce the difficulty of assembly and driving algorithm.

[0005] In the first aspect, the present invention provides a focusing device for driving a lens to focus, comprising: a base, a support, a carrier and two traction wires; the carrier is located directly above the base; a lens is arranged in the carrier, and when the carrier moves relative to the base along the optical axis, the carrier is used to adjust the focusing position of the lens, and the optical axis direction is perpendicular to the top surface of the base; the bottom end of the support is connected to the top of the base; the support is distributed around the carrier; each of the traction wires has two end sections and a middle section; the middle section is located between the two end sections; the traction wire is made of shape memory material; the two end sections are fixedly connected to the top of the support; the two end sections are electrically connected to a power supply unit; the power supply unit is used to load current to the traction wire; the middle section is connected to the carrier; when the current on the traction wire changes, it is used to extend or shorten the traction wire to drive the carrier to move relative to the base.

[0006] Optionally, the carrier is fixedly connected with two claws; the claws are connected to the middle section; the number of the support members is 2; the center line of the two support members and the center line of the two claws form a first angle; the two end sections of each of the traction wires form a second angle; the angle of the first angle and the angle of the second angle are both greater than 0.

[0007] Optionally, the claw is fixedly connected to the middle section; when the traction wire is loaded with current, the length of the middle section remains fixed, and the length of the end section is extended or shortened under the control of the current.

[0008] Optionally, the claw is slidably connected to the middle section; when the traction wire is loaded with current, the length of the middle section and the length of the end section are both extended or shortened under the control of the current.

[0009] Optionally, the device further comprises a magnet assembly; the magnet assembly comprises a magnetic sheet connected to the base and a magnet connected to the carrier; when the traction wire is not loaded with current, the magnetic sheet and the magnet are attracted to each other.

[0010] Optionally, the device further comprises a shielding cover; the bottom end of the shielding cover is connected to the edge of the base; the shielding cover is arranged on the outer side of the carrier to shield the magnetic field of the magnet assembly.

[0011] Optionally, the device further comprises an elastic member; the outer end of the elastic member is connected to the base; the inner end of the elastic member is connected to the carrier; and the elastic member is used to cushion the impact of the carrier on the shielding cover and the base.

[0012] Optionally, the elastic member includes a first spring; the outer end of the first spring is connected to the bottom end of the base; and the inner end of the first spring is connected to the bottom end of the carrier.

[0013] Optionally, the top of the base is also connected to an anti-torsion column; an anti-torsion groove is provided on the inner side of the carrier; the anti-torsion column is slidably connected to the anti-torsion groove, so as to enable the carrier to slide only along the optical axis under the action of the traction wire.

[0014] Optionally, a damping rubber block is provided between the carrier and the support member; the damping rubber block is used to reduce the impact of the carrier on the support member and provide torsion limitation for the carrier.

[0015] Optionally, the traction wire is configured as a shape memory alloy wire; the shape memory alloy wire is shortened when current is loaded; the greater the loaded current, the greater the shortening amount of the shape memory alloy wire.

[0016] In a second aspect, the present invention provides an assembly method for a focusing device, which is applied to assembling the device described in any one of the first aspects, comprising: fixing a support member to the top of a base; connecting the middle section of a traction wire to a carrier; placing the carrier directly above the base; and fixing the end section of the traction wire to the top of the support member.

[0017] In a third aspect, the present invention provides a lens system, comprising an anti-shake device and a focusing device described in any one of the first aspects; the anti-shake device is configured as a magnetically driven anti-shake component or a thermally driven anti-shake component; in some embodiments, the magnetically driven anti-shake component comprises a driving unit, an anti-shake sub-unit and an anti-shake stator unit; the anti-shake sub-unit is connected to the base of the focusing device; the driving unit comprises an anti-shake coil and an anti-shake magnet arranged opposite to the anti-shake coil; when the anti-shake coil is loaded with current, it is used to drive the anti-shake magnet to move relative to the anti-shake coil, so that the anti-shake sub-unit drives the base of the focusing device to move relative to the anti-shake stator unit along a predetermined direction; the thermally driven anti-shake component comprises a pressing plate assembly, a reed, a support and an adjusting wire; the reed is connected to the base of the focusing device; the adjusting wire is fixed on the reed; the reed is arranged on the support, the adjusting wire is made of a shape memory material, and the adjusting wire is electrically connected to the pressing plate assembly, so that when the adjusting wire is loaded with current, it extends or shortens and drives the reed and the base of the focusing device to move along a predetermined direction; the predetermined direction is perpendicular to the optical axis direction.

[0018] Compared with the prior art, the beneficial effects of the present invention are: the present invention uses two traction wires to achieve the focusing function, thereby reducing the complexity and error probability of the assembly process, and the current control algorithm loaded into the traction wire can be simpler and more direct, reducing the difficulty of development and debugging, thereby allowing faster response time and achieving faster focusing speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the exploded structure of a focusing device provided by the present invention when viewed along the Y direction; Figure 2 A schematic diagram of the three-dimensional structure of a focusing device provided by the present invention; Figure 3 A schematic diagram of the distribution structure of a traction wire provided by the present invention relative to a carrier in the Z direction; Figure 4 A schematic diagram of the assembly structure of a carrier and a base provided by the present invention when viewed from a Z direction; Figure 5 A schematic flow chart of an assembly method of a focusing device provided by the present invention; Figure 6 A partial structural schematic diagram of a thermally driven anti-shake component provided by the present invention.

[0020] Description of reference numerals in the figures: 1. Base; 2. Support member; 3. Carrier; 4. Traction wire; 5. Power supply unit; 6. Claw; 7. Magnet assembly; 8. Elastic member; 101, shielding cover; 102, anti-torsion column; 103, lower shell; 201, wire clamp; 301, anti-torsion groove; 401, end section; 402, middle section; 701, magnetic sheet; 702, magnet; 801, first spring; 802, second spring; 803, damping rubber block; 10. Adjusting wire; 20. Reed; 30. Pressing sheet assembly. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be understood by people with general skills in the field to which the present invention belongs. "Including" and similar words used in this article mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0022] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0023] In view of the problems existing in the existing technology, such as Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a focusing device for driving a lens to focus, comprising: a base 1, a support member 2, a carrier 3 and two traction wires 4; the carrier 3 is located directly above the base 1; a lens is arranged in the carrier 3, and the carrier 3 is used to adjust the focusing position of the lens when it moves relative to the base 1 along the optical axis direction, and the optical axis direction is perpendicular to the top surface of the base 1; the bottom end of the support member 2 is connected to the top of the base 1; the support members 2 are distributed around the carrier 3; each of the traction wires 4 has two an end section 401 and a middle section 402; the middle section 402 is located between the two end sections 401; the traction wire 4 is made of shape memory material; the two end sections 401 are fixedly connected to the top of the support member 2; the two end sections 401 are electrically connected to the power supply unit 5; the power supply unit 5 is used to load current to the traction wire 4; the middle section 402 is connected to the carrier 3; when the current on the traction wire 4 changes, it is used to make the traction wire 4 extend or shorten, so as to drive the carrier 3 to move relative to the base 1.

[0024] In some specific embodiments, the base 1 is in the shape of a quadrilateral plate with a circular hole in the center thereof, and the circular hole is used to accommodate the carrier 3 .

[0025] In some other specific embodiments, the support member 2 is arranged in an "L" shape at the top edge of the base 1. Two support members 2 are provided, each support member 2 has two slopes, and the angle between the slope and the top surface of the base 1 is a. a is any angle value greater than 0 and less than 90°.

[0026] In some further specific embodiments, the support member 2 is integrally provided with the base 1 .

[0027] In some further specific embodiments, when the traction wire 4 is not loaded with current, the length of the traction wire 4 is the largest, and the traction wire 4 in a relaxed state falls on the slope.

[0028] It is worth noting that the design of the base, support and traction wire makes the entire device small in size, suitable for use in devices with limited space, such as smartphone cameras or other portable optical instruments. The properties of shape memory materials allow the traction wire to respond quickly to changes in current, shortening the focusing time and improving the user experience. Since focusing can be achieved by only changing the current, this focusing device may consume less energy than traditional motor drive methods.

[0029] In some embodiments, a wire clamp 201 is provided at the top of the support member 2. The wire clamp 201 is made by bending a plate-like member. When the plate-like member is bent, the end section 401 is clamped and fixed.

[0030] In some examples, the end section 401 in the wire clamp 201 is electrically connected to the power supply unit 5. The power supply unit 5 is configured to be connected to a power supply terminal of a circuit board. The circuit board is provided with a processor for controlling the current flowing through the traction wire 4.

[0031] like Figure 3 As shown, in some embodiments, the carrier 3 is fixedly connected with two claws 6; the claws 6 are connected to the middle section 402; the number of the support members 2 is 2; the center line of the two support members 2 and the center line of the two claws 6 form a first angle; the two end sections 401 of each of the traction wires 4 form a second angle; the angle b1 of the first angle and the angle b2 of the second angle are both greater than 0.

[0032] In some specific embodiments, the first angle b1 and the second angle b2 are both set to 90°.

[0033] In some examples, from the perspective of the Z direction, the first end section 401 of the traction wire 4 extends along the X direction, and the second end section 401 of the traction wire 4 extends along the Y direction. The X direction, the Y direction, and the Z direction are perpendicular to each other. The Z direction is the optical axis direction.

[0034] It is worth noting that the traction wire 4 extends along the X and Y directions, ensuring that the movement in the Z direction is direct and linear, avoiding unnecessary lateral force interference, and improving the focusing speed and accuracy.

[0035] In some embodiments, the claw 6 is fixedly connected to the middle section 402; when the traction wire 4 is loaded with current, the length of the middle section 402 remains fixed, and the length of the end section 401 is extended or shortened under the control of the current.

[0036] In some specific embodiments, when the current loaded on the traction wire 4 increases, the length of the end segment 401 decreases; when the current loaded on the traction wire 4 decreases, the length of the end segment 401 increases.

[0037] In some examples, when the current loaded on the traction wire 4 increases from a first threshold value to a second threshold value, the length of the end segment 401 gradually shortens; when the current loaded on the traction wire 4 decreases from the second threshold value to the first threshold value, the length of the end segment 401 gradually lengthens.

[0038] In other examples, when the current loaded on the traction wire 4 increases from 0 to a first threshold, the length of the end segment 401 remains unchanged; when the current loaded on the traction wire 4 decreases from the first threshold to 0, the length of the end segment 401 remains unchanged.

[0039] In some other examples, when the current loaded on the traction wire 4 decreases from the second threshold value to the first threshold value, the length of the end segment 401 remains unchanged; when the current loaded on the traction wire 4 increases from the first threshold value to the second threshold value, the length of the end segment 401 remains unchanged.

[0040] It is worth noting that the first threshold refers to the minimum current value that can induce a significant phase transformation of the SMA (from martensite to austenite). When the current reaches this threshold, the SMA begins to heat up and gradually undergoes a phase transformation, causing the material to shrink. The second threshold is a current value higher than the first threshold, at which the SMA has completely transformed into the austenite phase and the temperature is close to or has reached the thermal saturation point. After exceeding the second threshold, the length of the SMA will not change significantly because the phase transformation has been completed and the temperature has stabilized.

[0041] In some embodiments, the claw 6 is slidably connected to the middle section 402; when the traction wire 4 is loaded with current, the length of the middle section 402 and the length of the end section 401 are both extended or shortened under the control of the current.

[0042] In some specific embodiments, when the current loaded on the traction wire 4 increases, the length of the middle section 402 and the length of the end section 401 are shortened; when the current loaded on the traction wire 4 decreases, the length of the middle section 402 and the length of the end section 401 are lengthened.

[0043] In some examples, when the current loaded on the traction wire 4 increases from a first threshold value to a second threshold value, the length of the middle section 402 and the length of the last section 401 are gradually shortened; when the current loaded on the traction wire 4 decreases from the second threshold value to the first threshold value, the length of the middle section 402 and the length of the last section 401 are gradually lengthened.

[0044] In other examples, when the current loaded on the traction wire 4 increases from 0 to a first threshold value, the length of the middle section 402 and the length of the end section 401 remain unchanged; when the current loaded on the traction wire 4 decreases from the first threshold value to 0, the length of the middle section 402 and the length of the end section 401 remain unchanged.

[0045] In some other examples, when the current loaded on the traction wire 4 decreases from the second threshold value to the first threshold value, the length of the middle section 402 and the length of the last section 401 remain unchanged; when the current loaded on the traction wire 4 increases from the first threshold value to the second threshold value, the length of the middle section 402 and the length of the last section 401 remain unchanged.

[0046] In some embodiments, the traction wire 4 is configured as a shape memory alloy wire; the shape memory alloy wire is shortened when current is loaded; the greater the loaded current, the greater the shortening amount of the shape memory alloy wire.

[0047] In some embodiments, the device also includes a magnet assembly 7; the magnet assembly 7 includes a magnetic sheet 701 connected to the base 1 and a magnet 702 connected to the carrier 3; when the traction wire 4 is not loaded with current, the magnetic sheet 701 and the magnet 702 are attracted to each other.

[0048] It is worth noting that the attraction between the magnetic sheet 701 and the magnet 702 can help the traction wire 4 to recover its original length faster when the current decreases, thereby accelerating the resetting process of the carrier 3 and improving the response speed.

[0049] like Figure 3 and Figure 4As shown, in some specific embodiments, the base 1 and the carrier 3 are both arranged in a quadrilateral plate shape. The number of groups of the magnet assembly 7 is set to 2, wherein the two magnetic sheets 701 are located on the diagonal line of the base 1. Two grooves are arranged on the diagonal line of the carrier 3. Two magnets 702 are correspondingly arranged in the two grooves.

[0050] Please refer to Figure 1 As shown, in some embodiments, the device further includes a shielding cover 101; the bottom end of the shielding cover 101 is connected to the edge of the base 1; the shielding cover 101 is disposed on the outside of the carrier 3 to shield the magnetic field of the magnet assembly 7.

[0051] In some specific embodiments, a lower housing 103 is further included, and the base 1 is fixedly connected to the lower housing 103. The lower housing 103 is detachably connected to the shielding cover 101.

[0052] It is worth noting that the design of the shielding cover 101 and the lower shell 103 introduced in this embodiment significantly enhances the functionality and reliability of the focusing device. The shielding cover 101 not only effectively shields the magnetic field and reduces electromagnetic interference, but also provides physical protection; and the detachable connection between the lower shell 103 and the shielding cover 101 realizes a modular design and simplifies the maintenance process.

[0053] In some embodiments, the device further includes an elastic member 8; the outer end of the elastic member 8 is connected to the base 1; the inner end of the elastic member 8 is connected to the carrier 3; the elastic member 8 is used to buffer the impact of the carrier 3 on the shielding cover 101 and the base 1.

[0054] In some specific embodiments, the elastic member 8 includes a first spring 801 ; the outer end of the first spring 801 is connected to the bottom end of the base 1 ; and the inner end of the first spring 801 is connected to the bottom end of the carrier 3 .

[0055] In some other specific embodiments, the elastic member 8 further includes a second spring 802 ; the outer end of the second spring 802 is connected to the top of the base 1 ; and the inner end of the first spring 801 is connected to the top of the carrier 3 .

[0056] In some examples, the first spring 801 and the second spring 802 are both made by engraving spring sheets.

[0057] In other examples, positioning columns are provided at the top and bottom of the carrier 3 . The positioning column at the bottom of the carrier 3 is used to penetrate and position the first spring 801 ; the positioning column at the top of the carrier 3 is used to penetrate and position the second spring 802 .

[0058] It is worth noting that the design of the elastic member 8 introduced in this embodiment significantly enhances the functionality and reliability of the focusing device. The elastic member 8 not only effectively buffers the impact of the carrier 3 on the shielding cover 101 and the base 1, reducing the risk of mechanical damage, but also provides shock absorption and accelerated reset effects, thereby improving the overall performance of the system.

[0059] In some embodiments, the top of the base 1 is also connected to an anti-torsion column 102; an anti-torsion groove 301 is provided on the inner side of the carrier 3; the anti-torsion column 102 is slidably connected to the anti-torsion groove 301, so as to enable the carrier 3 to slide only along the optical axis under the action of the traction wire 4.

[0060] In some specific embodiments, the anti-torsion column 102 is provided in a cylindrical shape, and the anti-torsion groove 301 is provided in a cylindrical groove shape. Two anti-torsion columns 102 are fixedly connected to the top of the base 1 .

[0061] In some other specific embodiments, the anti-torsion column 102 is arranged in a prismatic shape, and the anti-torsion groove 301 is arranged in a prismatic groove shape.

[0062] In some examples, the anti-torsion column 102 is fixed to the top of the base 1 , or the anti-torsion column 102 is integrally provided with the base 1 .

[0063] It is worth noting that the cooperation between the anti-torsion column 102 and the anti-torsion groove 301 in this embodiment ensures that the carrier 3 slides only along the optical axis direction, eliminating any unnecessary rotation or lateral displacement, and improving the focusing accuracy.

[0064] Please refer to Figure 3 As shown, in some embodiments, a damping rubber block 803 is provided between the carrier 3 and the support member 2 ; the damping rubber block 803 is used to reduce the impact of the carrier 3 on the support member 2 and provide torsion limitation for the carrier 3 .

[0065] In some specific embodiments, the number of the damping rubber blocks 803 is an even number. In some examples, the damping rubber blocks 803 include a first rubber block and a second rubber block. The first rubber block is fixed to the outer edge of the carrier 3. The second rubber block is fixed to the side wall of the support member 2, and the side wall faces the carrier 3. The first rubber block and the second rubber block are arranged in a one-to-one correspondence.

[0066] In some examples, four of the first rubber blocks are distributed around the carrier 3 ; four of the second rubber blocks are distributed on the side walls of the support 2 , and the second rubber blocks are arranged opposite to the first rubber blocks.

[0067] In some other examples, the four first glue blocks are respectively distributed on the X direction side, the anti-X direction side, the Y direction side, and the anti-Y direction side of the carrier 3 .

[0068] It is worth noting that the design of introducing the damping rubber block 803 in this embodiment significantly enhances the functionality and reliability of the focusing device. The damping rubber block 803 not only effectively reduces the impact of the carrier 3 on the support 2 and reduces the risk of mechanical damage, but also provides a torsion limit to ensure that the carrier 3 only slides along the optical axis, thereby improving the stability and accuracy of the system.

[0069] like Figure 5 As shown, the second embodiment provides an assembly method of a focusing device, which is applied to assembling the device described in any one of the above embodiments, including: fixing the support member 2 to the top of the base 1; connecting the middle section 402 of the traction wire 4 to the carrier 3; placing the carrier 3 directly above the base 1; and fixing the end section 401 of the traction wire 4 to the top of the support member 2.

[0070] In some embodiments, the method further includes: inserting the magnet 702 coated with glue into the groove of the carrier 3 so that the magnet 702 is fixed to the carrier 3; welding the outer end of the first spring 801 to the bottom pad of the base 1; coating the inner end of the first spring 801 with glue so that the inner end of the first spring 801 is bonded to the bottom end of the carrier 3; fixing the damping rubber block 803 on the peripheral side of the carrier 3 and the side wall of the support member 2 facing the carrier 3. Welding the outer end of the second spring 802 to the top pad of the base 1; coating the inner end of the second spring 802 with glue so that the inner end of the second spring 802 is bonded to the top of the carrier 3.

[0071] It is worth noting that the glue can be cured by heating in an oven. The assembly method of the focusing device of this embodiment not only ensures the correct installation and connection of each component, but also improves the stability and reliability of the lens system through reasonable process design.

[0072] In some other embodiments, fixing the support member 2 to the top of the base 1 includes bonding the bottom end of the support member 2 to the top of the base 1. In some other specific embodiments, the support member 2 and the base 1 are provided as one piece.

[0073] In some other embodiments, connecting the middle section 402 of the traction wire 4 to the carrier 3 includes: welding a claw 6 on an edge pad of the carrier 3 , and connecting the middle section 402 of the traction wire 4 to the claw 6 .

[0074] In some examples, the process includes inserting the end section 401 of the traction wire 4 into the clamping claw 6 , pulling the traction wire 4 , and keeping the middle section 402 in the clamping claw 6 .

[0075] In some other examples, the method further includes: applying pressure to the clamping claw 6 so that the traction wire 4 is clamped and fixed by the clamping claw 6. In some other examples, the method further includes: applying glue to the clamping claw 6 and the middle section 402 so that the clamping claw 6 is bonded and fixed to the middle section 402.

[0076] In some further embodiments, the carrier 3 is placed directly above the base 1 , including: inserting the anti-torsion columns 102 at the top of the base 1 into the anti-torsion grooves 301 on the inner side of the carrier 3 one by one.

[0077] In some specific embodiments, the height at which the claw 6 is fixed on the carrier 3 is lower than the height of the wire clamp 201 at the top of the support member 2. In some examples, the claw 6 is fixed on the lower end surface of the carrier 3. This example can further increase the height difference of the pulling wire 4 and thus increase the focusing stroke to meet the focusing requirements, while facilitating the thinning of the structure of the focusing device.

[0078] In some possible embodiments, the end segment 401 of the traction wire 4 is fixedly connected to the top of the support member 2 , including: using a wire clamp 201 to fix the end segment 401 of the traction wire 4 , and welding the wire clamp 201 to the top pad of the support member 2 .

[0079] In some other embodiments, the base 1 is fixedly connected to the lower housing 103. The lower housing 103 is assembled with the shielding cover 101 by buckling. In some examples, glue is used to cure the connection between the lower housing 103 and the shielding cover 101, so that the lower housing 103 and the shielding cover 101 are fixedly packaged.

[0080] A third embodiment provides a lens system, including an anti-shake device and a focusing device as described in any one of the above embodiments; the anti-shake device is configured as a magnetically driven anti-shake component or a thermally driven anti-shake component.

[0081] In some embodiments, the magnetically driven anti-shake component has a driving unit, an anti-shake sub-unit and an anti-shake stator unit; the anti-shake sub-unit is connected to the base of the focusing device; the driving unit includes an anti-shake coil and an anti-shake magnet arranged opposite to the anti-shake coil; when the anti-shake coil is loaded with current, it is used to drive the anti-shake magnet to move relative to the anti-shake coil, so that the anti-shake sub-unit drives the base of the focusing device to move along a predetermined direction relative to the anti-shake stator unit.

[0082] like Figure 6As shown, in other embodiments, the thermally driven anti-shake assembly has a pressing plate assembly 30, a spring 20, a support (not shown) and an adjusting wire 10; the spring 20 is connected to the base 1 of the focusing device; the adjusting wire 10 is fixed on the spring 20; the spring 20 is arranged on the support, the adjusting wire 10 is made of a shape memory material, and the adjusting wire 10 is electrically connected to the pressing plate assembly 30, so that the adjusting wire 10 is extended or shortened when the current is loaded and drives the spring 20 and the base 1 of the focusing device to move along a predetermined direction; the predetermined direction is perpendicular to the optical axis direction. In some specific embodiments, the predetermined direction is set to the X direction or the Y direction, and the optical axis direction is set to the Z direction.

[0083] Please refer to Figure 6 and Figure 1 In some other possible embodiments, a heat insulation plate (not shown) is provided between the adjusting wire 10 and the traction wire 4 to isolate the heat transfer between the adjusting wire 10 and the traction wire 4 so that the focusing movement and the anti-shake movement of the lens do not interfere with each other.

[0084] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A focusing device, used to drive a lens to focus, characterized in that: include: Base, support, carrier and 2 traction wires; The carrier is located directly above the base; A lens is arranged in the carrier, and when the carrier moves relative to the base along the optical axis, the focusing position of the lens is adjusted, and the optical axis direction is perpendicular to the top surface of the base; The bottom end of the support member is connected to the top end of the base; the support members are distributed around the carrier; Each of the traction wires has two end sections and a middle section; the middle section is located between the two end sections; the traction wire is made of a shape memory material; The two end sections are both fixedly connected to the top of the support member; the two end sections are both electrically connected to a power supply unit; the power supply unit is used to load current to the traction wire; The middle section is connected to the carrier; when the current on the traction wire changes, it is used to extend or shorten the traction wire to drive the carrier to move relative to the base.

2. The device according to claim 1, characterized in that The carrier is fixedly connected with two claws; the claws are connected to the middle section; the number of the support members is 2; the center line of the two support members and the center line of the two claws form a first angle; the two end sections of each of the traction wires form a second angle; the angle of the first angle and the angle of the second angle are both greater than 0.

3. The device according to claim 2, characterized in that The claw is fixedly connected to the middle section; When the traction wire is loaded with electric current, the length of the middle section remains fixed, and the length of the end section is extended or shortened under the control of the electric current.

4. The device according to claim 2, characterized in that The claw is slidably connected to the middle section; When the pulling wire is loaded with electric current, the length of the middle section and the length of the end section are both extended or shortened under the control of the electric current.

5. The device according to claim 1, characterized in that The device further comprises a magnet assembly; the magnet assembly comprises a magnetic sheet connected to the base and a magnet connected to the carrier; When the traction wire is not loaded with current, the magnetic sheet and the magnet are attracted to each other.

6. The device according to claim 5, characterized in that The device also includes a shielding cover; The bottom end of the shielding cover is connected to the edge of the base; The shielding cover is arranged on the outer side of the carrier and is used for shielding the magnetic field of the magnet assembly.

7. The device according to claim 6, characterized in that The device also includes an elastic member; The outer end of the elastic member is connected to the base; The inner end of the elastic member is connected to the carrier; the elastic member is used to buffer the impact of the carrier on the shielding cover and the base.

8. The device according to claim 7, characterized in that The elastic member comprises a first spring; The outer end of the first spring is connected to the bottom end of the base; the inner end of the first spring is connected to the bottom end of the carrier.

9. The device according to claim 1, characterized in that The top of the base is also connected to an anti-torsion column; the inner side of the carrier is provided with an anti-torsion groove; The anti-torsion column is slidably connected to the anti-torsion groove, so as to enable the carrier to slide only along the optical axis direction under the action of the traction wire.

10. The device according to claim 1, characterized in that A damping rubber block is provided between the carrier and the support member; The damping rubber block is used to reduce the impact of the carrier on the support member and provide torsion limitation for the carrier.

11. The device according to claim 1, characterized in that The traction wire is configured as a shape memory alloy wire; The shape memory alloy wire shortens when current is applied; The greater the loaded current is, the greater the shortening amount of the shape memory alloy wire is.

12. A method for assembling a focusing device, applied to assembling the device according to any one of claims 1 to 11, characterized in that: include: Fix the support to the top of the base; Connecting the middle section of the traction wire to the carrier; placing the carrier directly above the base; The end section of the traction wire is fixedly connected to the top end of the support member.

13. A lens system, characterized in that: A focusing device comprising an anti-shake device and any one of claims 1 to 11; The anti-shake device is configured as a magnetically driven anti-shake component or a thermally driven anti-shake component; The magnetically driven anti-shake assembly comprises a driving unit, an anti-shake sub-unit and an anti-shake stator unit; The anti-shake subunit is connected to the base of the focus device; the driving unit includes an anti-shake coil and an anti-shake magnet arranged opposite to the anti-shake coil; when the anti-shake coil is loaded with current, it is used to drive the anti-shake magnet to move relative to the anti-shake coil, so that the anti-shake subunit drives the base of the focus device to move relative to the anti-shake stator unit along a predetermined direction; The thermally driven anti-shake assembly comprises a pressing plate assembly, a spring, a support and an adjusting wire; The reed is connected to the base of the focusing device; the adjusting wire is fixed on the reed; the reed is arranged on the support, the adjusting wire is made of shape memory material, and the adjusting wire is electrically connected to the pressing plate assembly, so that the adjusting wire can be extended or shortened when current is loaded and drive the reed and the base of the focusing device to move along a predetermined direction; the predetermined direction is perpendicular to the optical axis direction.

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