A double-string 3D bending lower spring sheet assembly for VCM motor

Abstract

The present application discloses a double-string 3D bent lower spring sheet assembly for VCM motors, which is composed of four lower spring units arranged in pairs and in a central symmetric manner. The lower spring unit is composed of a vertical spring sheet unit and a horizontal spring sheet unit that are integrally formed and connected to each other at 90° bends; the horizontal spring sheet unit is arranged on one side close to the inner wall of the vertical spring sheet unit, and the two ends are connected to the vertical spring sheet unit through double-string spring sheets to form an integrated structure. The double-string design adopted in the present application can avoid the problem that it is difficult to achieve strength and stress balance in a single-string structure. If the width is too wide, the resistance generated by the lower spring sheet will be large, and the design stress cannot be adjusted to the yield stress of the spring raw material, and the focal length adjustment effect is poor; if the string width is designed to be too small, the elastic coefficient of the spring will not meet the design requirements and cannot meet customer needs. At the same time, if the spring wire is too small, it is easy to break the wire during installation and use.

Description

Technical Field

[0001] The present invention relates to the field of precision micro-electromechanical equipment, in particular to a lower spring sheet for realizing lens adjustment in a VCM motor, and specifically to a double-string 3D-bent lower spring sheet assembly applied to a VCM motor. Background Art

[0002] Voice Coil Motor (Voice Coil Actuator / Voice Coil Motor), also known as VCM motor, is a device that converts electrical energy into mechanical energy and realizes linear and limited swing angle movement. It is a device that uses the interaction between the magnetic field from the permanent magnet and the magnetic poles in the magnetic field generated by the energized coil conductor to produce regular movement. Because the voice coil motor is a non-commutated power device. The main components are relatively simple, coils, springs, magnets, Hall and IC devices and some fixed structures. The springs of the voice coil motor are generally divided into upper springs and lower springs. Its main function is to fix the lens and its fixing mechanism so that the lens can move axially, radially or axially / radially at the same time under the condition of the electromagnetic action of the coil. It is a component used to balance the electromagnetic force and limit the movement displacement of the lens.

[0003] The structure of the existing lower spring of the voice coil motor is very simple. Although the design concept and matching lens are different according to different manufacturers, the overall structure is basically the same. They all use inner spring and outer spring connected to each other in the same plane, where the inner spring is used to connect the lens carrier and the outer spring is used to connect to the outside of the voice coil motor. The connection of the spring realizes the connection between the lens carrier and the outside of the voice coil motor and realizes a similar suspension effect. As long as there is a slight current through the electromagnetic coil set on the lens carrier and the permanent magnet set on the voice coil motor housing interacts to generate a force on the lens carrier, the movement of the lens is finally realized, thereby achieving the effect of adjusting the focal length, etc.

[0004] Prior art 1: Chinese invention patent, announcement number CN 104460180 B, discloses a voice coil motor that realizes optical image stabilization by open-loop translation. The patent document specification and its specification drawings specifically disclose a lower spring sheet. Combined with the text part of the patent specification and its drawings, it can be clearly seen that the lower spring sheet still adopts the overall plane setting method. This method is a traditional voice coil motor and is also the mainstream design method at present. Its advantage is that the structure of the lower spring can be designed according to the weight of the lens and its fixed carrier structure actually matched by the voice coil motor, as well as the number of turns of the coil and the current design size. However, the disadvantage is that as the lens becomes larger and the thrust becomes larger, the spring has a limited design space in the VCM motor. The single string wire can achieve the designed elastic coefficient by simply increasing the width of the spring, which will cause the stress of the spring to exceed the yield stress of the spring raw material, thereby causing the spring to break easily during life test and mechanical test. Affecting the product structure, the use effect is poor; at the same time, the lower spring sheet in the same plane design can only realize movement along the axial direction of the lens, that is, adjusting the focal length, and cannot be adjusted along the radial direction of the lens, that is, the anti-shake effect is very poor.

[0005] Prior art 2: Chinese design patent, application number: 201530035691.4, the appearance discloses a lower spring sheet for a voice coil motor with an inner and outer double-layer structure. It can be clearly seen and confirmed through its front view and rear view combined with the left and right view or the pitch view that the lower spring sheet disclosed in the technology still adopts a flat type, and the inner spring coil and the outer spring coil are connected by four fine strings arranged in an S shape to achieve the adjustment movement of the lens in the axial direction; at the same time, due to the S shape, although they are in the same plane, the S-shaped strings are very fine and can also achieve radial adjustment within a certain range, that is, they can achieve the effect of anti-shake. However, since the plane where the radial adjustment direction of this structure is located is consistent with the plane where the string width is located, although this structure can achieve radial adjustment, that is, it can achieve the effect of anti-shake, but the degree of adjustment is difficult to achieve linear adjustment, and the elastic coefficient of the string is not linear, which makes it extremely difficult to calculate accurately, so the adjustable range is very small and the effect is not ideal. The main adjustment direction of this structure is focus adjustment.

[0006] From the above two typical existing technical analyses, it can be seen that the existing voice coil motor lower spring design is mainly designed for focal length adjustment, and cannot take into account the anti-shake effect well. At the same time, the single-layer string wire in the same plane design has disadvantages regardless of the width. Therefore, it is particularly important and necessary to provide a new voice coil motor lower spring to solve the above technical problems, so that the existing digital lens can achieve better shooting effects. Summary of the invention

[0007] In order to solve the problem that the lower spring of the voice coil motor in the prior art adopts a single string structure when the lens is large, the pixels are large and the thrust is large, it is difficult to achieve a balance between strength and stress design. If the width is too wide, the resistance generated by the lower spring sheet will be large, the design stress will easily become larger (even exceed the yield stress), it will not be easy to adjust, and the focal length adjustment effect will be poor; if the string width is designed to be too small, it will not be able to meet the design requirements of the design spring elastic coefficient. At the same time, the small string width is prone to wire breakage during installation and use.

[0008] At the same time, the existing lower spring sheets all adopt the same plane design structure. This structural design is mainly for moving along the axial direction of the lens to adjust the focal length setting. It is not ideal for radial adjustment of the lens to achieve anti-shake effect. The present application provides a double-string 3D bending lower spring sheet assembly applied to VCM motors. The structure abandons the traditional idea of ​​plane design and adopts a targeted three-dimensional design. A plane design is adopted for the focal length adjustment of the lens axis, and a spring sheet perpendicular to the spring string for adjusting the focal length is adopted for the anti-shake effect. Thus, focusing and anti-shake can be stressed and adjusted separately, and focusing and anti-shake can be taken into account at the same time. Furthermore, the double-string design is adopted for the lower spring sheet structure for focusing, which avoids the problem of excessive stress and easy breakage and difficulty in installation, and avoids the problem of excessive spring design stress due to excessive string width, which is not conducive to breakage during mechanical testing and life testing.

[0009] In order to achieve the above objectives, specifically, this application provides the following technical solutions:

[0010] A double-string 3D bent lower spring sheet assembly applied to a VCM motor, comprising four lower spring units arranged in pairs in a centrally symmetrical manner, wherein the lower spring unit comprises a vertical spring sheet unit and a horizontal spring sheet unit which are integrally formed and connected to each other by a 90-degree bend; the plane where the vertical spring unit is located is arranged parallel to the focusing axis of a lens installed in the VCM motor, so that the elastic deformation direction of the vertical spring unit is consistent with the radial direction of the lens, so as to achieve anti-shake adjustment; similarly, the horizontal spring sheet unit is arranged along the radial direction of the lens, and its elastic deformation square is consistent with the axial direction of the lens, so as to achieve focusing. That is to say, the focusing and anti-shake of the lens are two directions perpendicular to each other, which are the axial direction and radial direction of the lens respectively. However, the present invention specifically sets the lower spring unit into a three-dimensional structure that is bent perpendicularly to each other, and adopts horizontal spring leaf units and vertical spring leaf units to adjust the focal length and anti-shake respectively. The advantage of such a setting is that it avoids the problem that the same plane structure in the prior art is used to complete the adjustment at 90° to each other, resulting in the elastic force being non-linear when adjusting in the direction that coincides with the plane where the spring leaf body is located, and it is impossible to achieve precise adjustment, thereby resulting in poor anti-shake effect. The above-mentioned elastic linearity means that within the elastic deformation range of the spring leaf, the external force it is subjected to is linearly related to the deformation amount, which can facilitate accurate calculation. If the elasticity does not change linearly and is interfered by various factors, then it can only be confirmed by sample experiments, which will not only lose accuracy, but also be difficult to operate, and will also have an obvious negative effect on the focusing and anti-shake effects.

[0011] The free end of the horizontal spring sheet unit is provided with a first connection hole for connecting the lens carrier, the free end of the vertical spring sheet unit is provided with a third connection hole for connecting the VCM motor base, and the end of the horizontal spring sheet unit connected to the vertical spring sheet unit is provided with a second connection hole for connecting the suspension and the support between the base and the lens carrier; the first connection hole, the second connection hole and the third connection hole have two functions: one is to be used for positioning with the connected structure to ensure the convenience and accuracy of installation; the second is to facilitate welding and power supply, the vertical spring sheet unit and the horizontal spring sheet unit not only need to play the role of spring sheet connection to make the lens suspended and move, but also play the role of wire conduction, which is used to power the coil installed on the lens carrier. Of course, it is worth explaining that the purpose of the above explanation of the role and principle is only to facilitate the understanding of the technical effect brought about by the new structural design of the present invention, and it is not the content required to be protected. The installation of the coil and the working principle of the electromagnetic action to promote the lens to focus accurately have long been in the prior art, and are also well known to those skilled in the art, and are not the content involved in this application; the mention here is only used to further illustrate the exquisiteness of the structural design of this application, and the beneficial effects brought about by anti-shake and focusing.

[0012] The horizontal spring clip unit is arranged on one side close to the inner wall of the vertical spring clip unit and the two ends are connected to the vertical spring clip unit through double string spring clips to form an integrated structure. The technical problem solved by the double string spring clip is that the strength and stress of the single string formed by the sum of the widths of the two strings are easier to control and softer, which solves the contradictory problem of increased stress caused by increased spring elastic coefficient. It is more suitable for the control of the coil in the voice coil motor and solves the technical problem of large internal stress and difficulty in adjustment. At the same time, because the two strings are stressed at the same time, they are stronger and more reliable than a single thin string, and are not prone to abnormal breakage. In addition, during the installation process, the self-deformation is also small, which is also more conducive to installation, improving assembly efficiency and the problem of axis axis inclination in product characteristics.

[0013] As the preferred structural design of the present application: the vertical spring clip unit includes a first vertical spring clip and a second vertical spring clip which are vertically connected to each other, the free end of the first vertical spring clip is fixedly connected to the base through the third connecting hole, and the second vertical spring clip is fixedly connected to the horizontal spring clip unit. The vertical connection of the first vertical spring clip and the second vertical spring clip has two functions: first, the actual adjustment direction of the corresponding vertical spring clip is the radial direction of the lens, that is, the XY plane of the world coordinate system, and the first vertical spring clip and the second vertical spring clip which are perpendicular to each other are more conducive to the calculation of the magnetic force corresponding to the electromagnetic coil used for anti-shake design. Second, it can perfectly fit the shape of the support and base in the voice coil motor, which is easy to install.

[0014] As a preferred technical solution of the present invention: the first vertical spring sheet and the second vertical spring sheet are fixedly connected by a pleated joint provided at the connection. Since the first vertical spring sheet and the second vertical spring sheet are both straight strip structures, their elastic deformation has a linear law, and they are more capable of accurately calculating the relationship between the deformation amount (i.e., the displacement distance value required for anti-shake adjustment) and the magnitude of the applied magnetic force. The purpose of setting the pleated joint is to minimize the influence of the slight deformation caused by the connection part of the first vertical spring sheet and the second vertical spring sheet on the linear law of deformation of the entire vertical spring sheet unit. The purpose of using the pleated joint is also for this reason. Since the pleated joint has a large deformation curvature of its own, it basically has no elastic deformation compared with the straight first vertical spring sheet and the second vertical spring sheet, thereby ensuring that the deformation of the entire vertical spring sheet unit comes from the first vertical spring sheet and the second vertical spring sheet with a linear elastic change law.

[0015] In a further preferred embodiment, one of the upper and lower end surfaces of the pleated joint is provided with a reinforcing sheet for increasing the bending strength of the pleated joint, and the reinforcing sheet is parallel to the plane where the double-string spring sheet is located. The role of providing the reinforcing sheet is also to enhance the anti-deformation ability of the pleated joint. Since the reinforcing sheet is in the XY plane, that is, the radial plane of the lens, the plane where the anti-shake offset direction is located has no deformation ability, the possibility of the deformation of the pleated joint itself affecting the anti-shake is zero, thereby improving the adjustment accuracy of the anti-shake.

[0016] It is further preferred that the pleated joint is an arc-shaped piece bent at 90°, and a plurality of anti-bending pleats are arranged on the arc-shaped piece. The purpose of providing a plurality of pleats is to ensure that the deformation resistance of the upper and lower end surfaces of the pleated joint is uniform. Although the reinforcing sheet has a good deformation resistance, it is not convenient to provide reinforcing sheets on both the upper and lower end surfaces of the pleated joint during actual setting due to the limitation of the installation space or for the convenience of assembly. Therefore, the pleats also have a very important anti-deformation effect, which is of substantial significance for realizing the precise calculation of the anti-shake of the lens. The number of the pleats is 2-5. The factors considered in setting the number mainly include the size of the structural size itself. The preferred size is that the maximum radius of the pleats is 10%-15% of the bending radius of the pleated joint.

[0017] As a preferred technical solution of the present invention, specifically, the double-string spring piece is composed of two inner and outer strings arranged in the same plane with the same interval and / or width. Both free ends of the lower spring unit are provided with reserved welding pieces for electric welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 yes Figure 1 A top view of

[0021] Figure 3 yes Figure 2 Left view of

[0022] Figure 4 It is a three-dimensional structural diagram of the lower spring unit;

[0023] Figure 5 It is the assembly drawing of the lower spring leaf assembly and the base;

[0024] Figure 6 It is the assembly drawing of the lens carrier, the support and the lower spring assembly;

[0025] Figure 7 It is a schematic diagram of the orientation of the present application in the world coordinate system.

[0026] In the figure: 1-lower spring sheet assembly; 2-base; 3-support; 4-lens carrier;

[0027] 10-lower spring unit; 11-double string spring; 111-inner string; 112-outer string; 12-first connecting hole; 13-second connecting hole;

[0028] 21 - third connecting hole; 22 - first vertical spring piece; 23 - fold joint; 24 - second vertical spring piece; 25 - reinforcement piece. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0033] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0034] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] Embodiment 1:

[0036] In conjunction with the instruction manual Figure 1-6 A double-string 3D bent lower spring sheet assembly for a VCM motor is shown, which is composed of four lower spring units 10 arranged in a centrally symmetrical manner in pairs. The lower spring unit 10 is composed of a vertical spring sheet unit and a horizontal spring sheet unit that are integrally formed and connected to each other by a 90° bend. The plane where the vertical spring unit is located is arranged parallel to the focusing axis of the lens installed in the VCM motor, so the elastic deformation direction of the vertical spring unit is consistent with the radial direction of the lens, which is used to achieve anti-shake adjustment. Similarly, the horizontal spring sheet unit is arranged along the radial direction of the lens, and its elastic deformation square is consistent with the axial direction of the lens, which is used to achieve focusing. That is to say, the focusing and anti-shake of the lens are in two directions perpendicular to each other, namely the axial direction and the radial direction of the lens. However, the present invention specifically sets the lower spring unit into a three-dimensional structure that is bent perpendicularly to each other, and adopts a horizontal spring unit and a vertical spring unit to respectively adjust the focal length and anti-shake. The advantage of such a setting is that it avoids the use of the same plane structure in the prior art to complete the adjustment at 90° to each other, resulting in non-linear elastic force when adjusting in the direction coincident with the plane where the spring sheet body is located, and precise adjustment cannot be achieved, thereby resulting in a poor anti-shake effect.

[0037] The free end of the horizontal spring clip unit is provided with a first connecting hole 12 for connecting to the lens carrier 4, the free end of the vertical spring clip unit is provided with a third connecting hole 21 for connecting to the VCM motor base 2, and the horizontal spring clip unit is connected to the vertical spring clip unit. The end is provided with a second connecting hole 13 for connecting the suspension and the support 3 between the base 2 and the lens carrier 4; the first connecting hole 12, the second connecting hole 13 and the third connecting hole 21 have two functions: one is to be used for positioning with the connected structure to ensure the convenience and accuracy of installation; the other is to facilitate welding and power supply. The vertical spring clip unit and the horizontal spring clip unit not only need to play the role of spring clip connection to make the lens suspended and move, but also play the role of conductive wire conduction, which is used to power the coil installed on the lens carrier 4. Of course, it is worth pointing out that the purpose of the above explanation of the functions and principles is only to facilitate the understanding of the technical effects brought about by the new structural design of the present invention, and it is not the content that requires protection. The installation of the coil and the working principle of the electromagnetic effect to drive the lens for precise focusing have long been the prior art and are also well known to those skilled in the art, and are not the content involved in this application; it is mentioned here only to further illustrate the subtlety of the structural design of this application and the beneficial effects brought about by anti-shake and focusing.

[0038] The horizontal spring sheet unit is arranged on one side close to the inner wall of the vertical spring sheet unit and the two ends are connected to the vertical spring sheet unit through the double string spring sheet 11 to form an integrated structure. The technical problem solved by the double string spring sheet 11 is that the strength and stress of the single string formed by the sum of the widths of the two strings are easier to control, softer, and more suitable for the control of the coil in the voice coil motor, solving the technical problem of large internal stress and difficulty in adjustment; at the same time, because the two strings are stressed at the same time, the strength is better than that of a single thin string, the reliability is better, and it is not easy to break abnormally. In addition, during the installation process, the self-deformation is also small, which is also more conducive to installation and improves assembly efficiency.

[0039] The principles for achieving focusing and anti-shake of the lens in this embodiment are as follows: Before explaining the principles, in order to better illustrate the advantages of the present invention, the existing adjustment principles are briefly described first. The adjustment of focal length is actually achieved by changing the distance between the lens and the photosensitive element. From the perspective of movement, it is actually the lens that changes the distance between the lens and the photosensitive element through reciprocating motion in a smaller range along the axial direction to achieve zooming and focusing, thereby obtaining a clearer image. Similarly, anti-shake is to apply an accelerated movement to the lens along the radial direction in the opposite direction of the actual acceleration of the lens to offset the shake caused by the external force moving the lens, so as to achieve the effect of anti-shake. These principles are existing. At the same time, the driving force for driving the lens to move in the radial plane and in the axial plane is achieved by the action of the magnet set on the base 2 or the lens carrier 4. The electromagnetic force overcomes the elastic force generated by the lower spring assembly and finally drives the lens to move in the radial direction to achieve anti-shake, or drives the lens to move in the axial direction to achieve focusing. The radial direction is defined as the XY coordinate in the world coordinate system, as shown in the following example. Figure 7 As shown in the orientation, the movement along the axial direction is the Z coordinate. For this embodiment, the first connecting hole 12 is connected to the lens carrier 4. Since there are four evenly distributed horizontal spring clip units, the lens carrier 4 is suspendedly connected to the support 3 through four double-string spring clips 11, and the support 3 is connected to the position where the second connecting hole 13 is set on another section of the double-string spring clip 11. Since the double-string spring clip 11 is arranged along the radial XY plane, it can move along the axial direction of the lens, that is, the Z axis, to achieve focal length adjustment. It is worth noting that: at this time, the lens carrier 4 and the support 3 used to fix the lens are connected by the structure of four double-string spring clips 11 to form a suspended structure that can move axially with each other.

[0040] Furthermore, the third connecting hole 21 is fixedly connected to the base 2, and the support 3 is connected to the base 2 through four vertical spring clip units. Since the vertical spring clip units are arranged along the axial Z-axis direction, the vertical spring clip units can move in the radial plane XY plane to achieve anti-shake adjustment. At this time, the support 3 and the base 2 are connected by four vertical spring clip units to form a suspension structure that can move in the radial plane. When not affected by other external forces, it remains relatively still, and when receiving radial or axial external forces, it makes corresponding adjustments to achieve focusing or anti-shake effects. The driving force that drives the double-string spring clip 11 to move in the axial Z-axis direction and drives the vertical spring clip unit to move in the radial plane XY plane comes from the electromagnetic coil, which is no different from the prior art and has been mentioned in the background technology and the specification, so it will not be repeated here.

[0041] Embodiment 2:

[0042] In order to better illustrate the present invention, based on the structure and principle of Example 1, further combined with the appendix of the specification Figure 1-7 As shown in the content, the vertical spring clip unit includes a first vertical spring clip 22 and a second vertical spring clip 24 which are vertically connected to each other. The free end of the first vertical spring clip 22 is fixedly connected to the base 2 through the third connection hole 21, and the second vertical spring clip 24 is fixedly connected to the horizontal spring clip unit. The vertical connection of the first vertical spring clip 22 and the second vertical spring clip 24 has two functions: first, the actual adjustment direction of the corresponding vertical spring clip is the radial direction of the lens, that is, the XY plane of the world coordinates. The first vertical spring clip 22 and the second vertical spring clip 24 which are vertical to each other are more conducive to the calculation of the magnetic force corresponding to the electromagnetic coil used for anti-shake design. Second, it can perfectly fit the shape of the support and base in the voice coil motor, which is easy to install.

[0043] As a preferred technical solution of the present invention: the first vertical spring piece 22 and the second vertical spring piece 24 are fixedly connected by a pleated joint 23 provided at the connection. Since the first vertical spring piece 22 and the second vertical spring piece 24 are both straight strip structures, their elastic deformation has a linear law, and they are more capable of accurately calculating the deformation amount, that is, the displacement distance value required for anti-shake adjustment and the magnitude relationship of the applied magnetic force. The purpose of setting the pleated joint 23 is to minimize the influence of the slight deformation caused by the connection part of the first vertical spring piece 22 and the second vertical spring piece 24 on the linear law of deformation of the entire vertical spring piece unit. The purpose of using the pleated joint 23 is also for this reason. Since the pleated joint 23 has a large deformation curvature of its own deformation, it basically has no elastic deformation compared with the straight first vertical spring piece 22 and the second vertical spring piece 24, so it is ensured that the deformation of the entire vertical spring piece unit comes from the first vertical spring piece 22 and the second vertical spring piece 24 with a linear elastic change law.

[0044] In a further preferred embodiment, one of the upper and lower end surfaces of the pleated joint 23 is provided with a reinforcing sheet 25 for increasing the bending strength of the pleated joint 23, and the reinforcing sheet 25 is parallel to the plane where the double-string shrapnel 11 is located. The role of providing the reinforcing sheet 25 is also to enhance the anti-deformation ability of the pleated joint 23. Since the reinforcing sheet 25 is not deformable in the XY plane, that is, the radial plane of the lens, the plane where the anti-shake offset direction is located, the possibility of the deformation of the pleated joint 23 itself affecting the anti-shake is zero, thereby improving the adjustment accuracy of the anti-shake.

[0045] It is further preferred that the pleated joint 23 is an arc-shaped piece bent at 90°, and a plurality of anti-bending pleats are arranged on the arc-shaped piece. The purpose of setting a plurality of pleats is to ensure that the upper and lower end surfaces of the pleated joint 23 have uniform anti-deformation ability. Although the reinforcing sheet 25 has a good anti-deformation ability, it is not convenient to set the reinforcing sheet 25 on both the upper and lower end surfaces of the pleated joint 23 during actual setting due to the limitation of the installation space or for the convenience of assembly. Therefore, the pleats also have a very important anti-deformation effect, which is of substantial significance for realizing the precise calculation of the anti-shake of the lens. The number of the pleats is 2-5. The factors considered in setting the number mainly include the size of the structural size itself. The preferred size is that the maximum radius of the pleats is 10%-15% of the bending radius of the pleated joint 23.

[0046] As a preferred technical solution of the present invention, specifically, the double-string spring piece 11 is composed of two inner strings 111 and outer strings 112 arranged in the same plane with the same spacing and / or width. Both free ends of the lower spring unit 10 are provided with reserved welding pieces for power welding. A notch for silver paste welding is also provided at one end close to the third connecting hole 21. The purpose of setting the notch is to provide necessary conditions for silver paste welding, which not only ensures the power-on effect of the product, but also improves the operating efficiency, reduces the equipment cost, improves the reliability of the product, ensures the cleanliness of the product, and improves the product quality. At present, the industry generally adopts the following method to realize the welding of the lower spring piece and the base in a limited space: first, make a PIN foot feature on the spring piece, then bend the PIN foot, and then use solder paste to weld it with the base. This method has the following disadvantages: 1. When the PIN foot feature on the spring piece is bent, it cannot be guaranteed that the bending angle is vertical 90°; it is easy to cause the PIN foot to break during welding, resulting in material waste and increased material cost. 2. The small position of the PIN pin requires high precision of the bending machine and fixture, which increases the equipment cost; 3. Soldering with solder paste is prone to problems such as tin frying and rosin, which affects the cleanliness of the product; the method in this embodiment can also completely avoid the defects or deficiencies in the prior art.

[0047] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A double-string 3D bent lower spring sheet assembly for a VCM motor, characterized in that: It is composed of four lower spring units (10) which are arranged in a centrally symmetrical manner in pairs, and the lower spring unit (10) is composed of a vertical spring unit and a horizontal spring unit which are integrally formed and connected to each other by a 90° bend; The free end of the horizontal spring sheet unit is provided with a first connection hole (12) for connecting to a lens carrier (4), the free end of the vertical spring sheet unit is provided with a third connection hole (21) for connecting to a VCM motor base (2), and the end of the horizontal spring sheet unit connected to the vertical spring sheet unit is provided with a second connection hole (13) for connecting to a support (3) suspended between the base (2) and the lens carrier (4); The horizontal spring sheet unit is arranged on one side close to the inner side wall of the vertical spring sheet unit and its two ends are connected to the vertical spring sheet unit through double-string spring sheets (11) to form an integrated structure; the vertical spring sheet unit comprises a first vertical spring sheet (22) and a second vertical spring sheet (24) which are vertically connected to each other, the free end of the first vertical spring sheet (22) is fixedly connected to the base (2) through the third connection hole (21), and the second vertical spring sheet (24) is fixedly connected to the horizontal spring sheet unit; the double-string spring sheet (11) is composed of two inner strings (111) and outer strings (112) which are arranged in the same plane with the same interval and / or width.

2. According to claim 1, a double-string 3D bent lower spring sheet assembly for VCM motor, characterized in that: The first vertical elastic sheet (22) and the second vertical elastic sheet (24) are fixedly connected via a fold joint (23) provided at the connection point.

3. The double-string 3D bent lower spring sheet assembly for VCM motor according to claim 2, characterized in that: A reinforcing sheet (25) for increasing the bending strength of the corrugated joint (23) is provided on one of the upper and lower end surfaces, and the reinforcing sheet (25) is parallel to the plane where the double-string shrapnel (11) is located.

4. The double-string 3D bent lower spring sheet assembly for VCM motor according to claim 3, characterized in that: The pleated joint (23) is an arc-shaped piece bent at 90°, and a plurality of anti-bending pleats are arranged on the arc-shaped piece.

5. The double-string 3D bent lower spring sheet assembly for VCM motor according to claim 4, characterized in that: The number of the folds is 2-5.

6. The double-string 3D bent lower spring assembly for VCM motor according to claim 1, characterized in that: Both free ends of the lower spring unit (10) are provided with reserved welding pieces for electric welding.

7. The double-string 3D bent lower spring sheet assembly for VCM motor according to claim 1, characterized in that: A notch for silver paste welding is also provided at one end close to the third connection hole (21).

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