A closed-loop voice coil motor with OIS function

Abstract

The present invention discloses a closed-loop voice coil motor with OIS function, including a moving module and a fixed module, wherein the moving module and the fixed module are connected through a spring sheet group and reach a suspended state when not subjected to external force, wherein the lens module is arranged on the moving module and the directional movement of the moving module relative to the fixed module realizes anti-shake and focusing functions; the moving module is provided with a coil energized by an external source so that the moving module is subjected to force and directional movement in a magnetic field, and feedback guidance is provided on the displacement through a feedback component arranged on the moving module; the spring sheet group includes a lower spring sheet, wherein one end of the lower spring sheet is fixed on the fixed module and the other end is fixed on the moving module, and a double string is provided on the lower spring sheet to connect the two fixed ends and provide elastic restoring force in the Z-axis direction. Through the provided double string structure, under the same thrust and the same elastic coefficient, the stress distribution of the spring is uniform and the maximum stress value is smaller.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic control equipment, and in particular relates to a closed-loop voice coil motor with an OIS function. Background Art

[0002] A voice coil motor (VCM) is a device that converts electrical energy into mechanical energy and achieves linear and limited swing angle motion. It is a device that uses the interaction between the magnetic field from a permanent magnet and the magnetic poles in the magnetic field generated by an energized coil conductor to produce regular motion. The principle is to control the position of the VCM motor by changing the size of the VCM coil current in a fixed magnetic field, thereby changing the distance between the lenses to achieve the focusing function. It is basically used in many mobile terminal devices. Because the energized conductor is subjected to force in the magnetic field, the VCM motor coil is subjected to a linear force. The focus of the camera is adjusted through linear reciprocating motion to achieve the purpose of autofocus. Of course, the position of the motor must be determined by a software algorithm.

[0003] The existing voice coil motor includes a housing, a front gasket, an upper spring sheet, a bracket, a carrier, a coil, a lower spring sheet, a rear gasket and a base from top to bottom, wherein the coil is arranged on the carrier, and a permanent magnet for generating a fixed magnetic field is arranged on the bracket or the base. Since the existing voice coil motor needs to improve the zoom movement efficiency of the carrier and deal with the stability of the entire moving part when it has an optical image stabilization function, it is necessary to optimize the upper spring sheet and the lower spring sheet. At present, the spring sheet adopts a large spring coefficient value in the traditional design, which leads to an increase in the wire size of the spring. When the spring shape is the same, the stress of the wide spring wire will become larger. When the space is limited, the shape of the spring wire cannot be adjusted, resulting in the design The spring coefficient value and stress become contradictory, thereby affecting the product structure and the use effect is poor. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a closed-loop voice coil motor with OIS function.

[0005] The technical solution adopted by the present invention is:

[0006] A closed-loop voice coil motor with an OIS function, which is arranged in a camera module and used to control zoom and anti-shake of a lens module, comprises a moving module and a fixed module, wherein the moving module and the fixed module are connected via a spring sheet group and are suspended without being acted upon by an external force, and the lens module is arranged on the moving module and anti-shake and focus functions are achieved by the directional movement of the moving module relative to the fixed module;

[0007] The moving module is provided with a coil energized by an external source so that the moving module is subjected to force and moves in a directional manner in a magnetic field, and a feedback component provided on the moving module is used to measure the displacement of the fixed lens module and provide feedback guidance;

[0008] The spring sheet group includes a lower spring sheet, one end of which is fixed on the fixed module and the other end is fixed on the moving module. The lower spring sheet is provided with a double string connecting the two fixed ends and providing elastic restoring force in the Z-axis direction.

[0009] The present invention belongs to a closed-loop VCM motor with OIS function. First of all, the VCM motor is a voice coil motor, which is an electrically controlled motion component that is controlled by an electromagnetic component and realizes the directional movement of the lens module based on the principle of electromagnetic induction. The so-called electromagnetic component controls the movement of the action structure relative to the fixed structure through an electromagnetic coil and an elastic mechanism provided between an action structure and a fixed structure. Generally, a permanent magnet is provided on the fixed structure to form a permanent magnetic field, and the direction of the action structure is controlled by energizing the coil and controlling the direction and magnitude of the incoming direct current.

[0010] In order for the VCM motor to achieve a closed-loop function, it is necessary to provide displacement feedback through a separately provided displacement detection mechanism, so that the controlled electromagnetic component is in a controlled state based on the result caused by the control command as a reference condition for other control commands. Compared with ordinary motor components, focusing is achieved through current control. Because there is no position feedback in this focusing process, it is necessary to move back and forth to find the focus position, so its positioning position cannot be effectively determined. Because the input signal is not controlled by the output signal, the lens module needs to overcome the elastic mechanism that provides the restoring force to move back and forth to focus to achieve the best image quality, which is often called the "bellows" effect. This method takes a long time to focus and consumes a lot of power. By adding a Driver IC for displacement detection feedback, the focusing efficiency is improved and power is saved.

[0011] The OIS function, or optical image stabilization, is a physical technology that achieves compensation for the shaking direction of the lens module and the fixed module. Because the lens module is suspended by a spring sheet group compared to the fixed module, it is necessary to compensate for its movement. Therefore, it is necessary to use an electromagnetic component on a plane perpendicular to the focus movement direction to perform reverse movement compensation for the relative displacement in the plane.

[0012] That is to say, the movement of the moving module in the entire motor relative to the fixed module can be defined by a three-axis stereo coordinate system, including the X-axis, Y-axis and Z-axis, where the plane where the XOY is located is the main plane of the lens module jitter displacement, and the main motion compensation is performed on this plane. The Z-axis corresponds to the focus movement direction of the lens module, and the main displacement component in this direction is roughly equal to the zoom control displacement. In the motor, there will be two corresponding moving parts with separate functional modules for realizing the corresponding functions, namely the zoom component and the anti-shake component. However, because the motor is used in small or micro camera components, in order to improve the compactness of the components, maximize the space utilization and maintain a small overall volume, the zoom component and the anti-shake component will have common parts, such as a fixed permanent magnetic field and a spring sheet group used by both parts.

[0013] In the prior art, there are also multiple spring sheets, each of which is provided with a string structure with a certain lever arm length, and a better restoring effect is provided by the string mechanism with a longer length. However, most of the prior art adopts a single string structure, which is too wide, resulting in excessive stress of the entire spring. When the design stress needs to be lower than the material yield stress, the thrust cannot be designed to be large, because the thrust is small and the large lens cannot be pushed. When the pixel is continuously increased, the motor design encounters a bottleneck, resulting in unsatisfactory imaging effect of the lens module; if a single spring wire design is used to achieve the elastic coefficient, it is difficult to design the design stress of the spring to be below the material yield stress, resulting in the situation that the spring design stress is greater than the material yield stress during the mechanical impact test, and it is easy to break, which affects the product structure and has a poor use effect.

[0014] The double string structure of the present invention can be directly manufactured by widening the original single wide string and then cutting a through groove along the center line on the template to form a double string mechanism. Compared with the single string, the structure has the same elastic resistance while retaining the structural stability, and can solve the problem of stress concentration and string breakage caused by the single string in mechanical impact test.

[0015] It is worth mentioning that, because the motor needs to provide zoom and anti-shake functions, and the functions are mainly based on generating displacement between the lens module and the sensor, but because relative displacement is generated, the subject that generates relative displacement is inconsistent according to different reference objects. The present invention also limits the movable module relative to the fixed module, but it only indicates that there are two components that can generate relative displacement, and does not limit them to be fixed or movable.

[0016] Moreover, to achieve the relative displacement between the moving module and the fixed module, at least two elements, the energized coil and the magnetic field, are required. However, since there are many ways to generate a magnetic field in this device, permanent magnets are generally used. In terms of force and reaction force, the energized coil will generate electromagnetic induction force in the magnetic field, and the magnet that generates the magnetic field will also be subject to a reaction force. This characteristic can be used to adjust the relative displacement of the two elements to achieve different effects. The present invention also includes two methods, namely, the coil is fixed and the magnet side moves; or the magnet is fixed and the coil side moves.

[0017] Furthermore, the lower spring sheet also includes a bending rib that is bent and extended toward the Z axis, the angle between the bending rib and the plane where the double string is located is not zero and is used to provide the moving module with elastic restoring force in the plane where the X axis and the Y axis are located.

[0018] The spring sheets in the existing spring sheet group are all planar structures, that is, materials of equal thickness are formed by cutting on metal plates of a certain thickness. This structure can restore the elastic force in the direction perpendicular to the plane where the spring sheet is located. However, in order to achieve the purpose of suspension of the dynamic module, the edge of the spring sheet is too slender under limited space. The current minimum width of the processing size can be maintained at about 0.05mm, and the processing accuracy cannot be fully guaranteed, which makes the material prone to breakage in reliability experiments at this width, resulting in defective products. At the same time, the planar design method cannot improve the strength of the structure when the width is too narrow, and the support effect on the suspended bracket is limited, and the overall structural weight is increased.

[0019] The present invention has a bending rib structure, which can have better structural strength than the existing flat spring sheet, and is used to provide better elastic restoring force in the XOY plane. As shown in the figure, it can be seen that the bending rib is arranged on the periphery of the entire lower spring sheet, and after installation, the bending rib is bent upward to form a metal sheet body of equal width compared to the double-string structure, and because the bending rib is a ring structure, the bending rib is not only folded upward by 90 degrees, but also bent in the Z-axis direction to form a ring structure, and wrinkles are provided at the bending position, thereby enhancing the structural strength.

[0020] Furthermore, the moving module comprises a movably connected bracket and a carrier, the carrier performs reciprocating linear displacement on the bracket relative to the bracket in the direction of the Z axis; and the spring sheet group is arranged between the bracket and the carrier to provide a restoring force;

[0021] The bracket is movably connected to the fixed module and moves in the XOY plane with the fixed module as a reference;

[0022] The bracket is provided with a magnet for forming a magnetic field.

[0023] Furthermore, the lower spring sheet includes a plurality of lower elastic bodies, and the lower elastic bodies are arranged between the fixed module and the movable module at equal central angles around the axis of the lens module;

[0024] The lower body comprises an inner fixed end, a middle fixed end and an outer fixed end;

[0025] The inner fixing end is connected to the carrier, the middle fixing end is connected to the bracket, and a double string is provided between the inner fixing end and the middle fixing end;

[0026] The outer fixing end is connected to the fixing module, and a bending rib is provided between the middle fixing end and the outer fixing end.

[0027] Furthermore, the fixed module includes a base, and one side of the base is provided with a shell for buckling the moving module on the base;

[0028] An integrated winding group is provided on the base, and a relative thrust is generated by the integrated winding group and the structure forming a magnetic field on the moving module, so that the moving module moves along the XOY plane on the base to offset the shaking of the lens module.

[0029] Furthermore, the base includes an upper base component and a lower base component that are interlocked, and contacts and pins are provided on the upper base component and the lower base component. The integrated winding group is arranged on the surface of the upper base component and is electrically connected to the contacts arranged on the surface of the upper base component.

[0030] Furthermore, an upper bottom circuit is provided in the upper bottom component, one end of the upper bottom circuit is connected to the contact of the upper bottom component, and the other end is connected to the pin of the upper bottom component;

[0031] A bottom circuit is provided in the bottom assembly; one end of the bottom circuit is connected to a contact of the bottom assembly, and the other end is connected to a pin of the bottom assembly;

[0032] The upper circuit and the lower circuit are both conductive structures formed by die stamping, and corresponding layered structures are formed by injection molding.

[0033] Among them, the two parts of the base are made by using a mold to stamp a 3D metal circuit combined with an injection molding machine for layered injection molding, and then snapping together through positioning pin holes to combine two different circuit board surfaces together to form a 3D circuit base, which effectively avoids the problems of complicated process, low efficiency, panel deformation, etc. caused by the installation of flexible circuit boards. By using an integrated 3D circuit base, the operating efficiency is improved, the labor cost is reduced, and the quality and reliability of the product are improved.

[0034] Specifically, metal stamping is first performed to make the 3D circuit routing lines, and then the metal is fixed together through injection molding to make two base components separately. The two molded components are then fastened together through gluing and positioning pins to achieve the same layered circuit purpose as the flexible board.

[0035] A plurality of contacts are arranged on the surface of the upper base component, so as to facilitate the connection of the lower spring sheet for conduction and to introduce the current entering from the pin into the corresponding coil, thereby achieving the effect of built-in conduction.

[0036] Furthermore, the integrated winding assembly is a single metal conductor forming an annular structure, a plurality of winding coils are formed on the integrated winding assembly by directional winding, and between the winding coils are taut straight conductor segments;

[0037] The straight conductor segments are attached to the corresponding contacts on the surface of the upper base component for fixing, and when the straight conductor segments at both ends of each winding coil are welded to the corresponding contacts, four independent winding coils are formed by cutting between the two contacts of the same straight conductor.

[0038] That is to say, in order to better fix the winding coils and to subsequently divide the interconnected multiple winding coils into multiple independent winding coils, preferably, the fixing structure used to fix the straight conductor segment is arranged in parallel pairs and is located in the middle of two adjacent winding coils. The above structure is used to fix the two adjacent winding coils separately, which is also conducive to the subsequent winding coil division. The two free ends of the copper wire after the division are fixed by the fixing structure without causing any impact on the winding coils, and are not affected by external forces. There is no fixed order between the division process and the welding process, which is more convenient to operate. The contact always corresponds to the position of the straight conductor segment, which greatly reduces the difficulty of welding and improves the accuracy and one-time success rate of welding.

[0039] First, the integrated winding group is directly fixed on the base through injection molding, and the straight conductor segment passes through all the contacts. The straight conductor segments near the two ends of each winding coil are fixed through a plastic fixing structure. A cutting groove is made in the middle of the two fixed points of the same straight conductor segment. After welding, the copper wire is cut at the dividing groove position to make the four winding coils independent. The welding feet are welded with other products to form an independent current loop, so that the product can achieve the purpose of controlling the current size separately.

[0040] Furthermore, a circuit body formed of a conductive material is provided in the bracket, and the circuit body is injection molded together with the material constituting the bracket.

[0041] Furthermore, the bracket is provided with an upper spring sheet for connecting to the carrier, and the upper spring sheet includes an upper string wire for providing elastic restoring force;

[0042] The lower part of the bracket is provided with a plurality of mounting grooves for fixing the magnets;

[0043] The feedback component includes a feedback magnet arranged on a carrier, and also includes a Hall sensor arranged on a bracket. The Hall sensor is arranged in an IC slot opened on an inner wall of the bracket.

[0044] The beneficial effects of the present invention are:

[0045] (1) Under the same thrust condition, the double string structure adopted by the present invention has a greater increase in K value than the original single value, with less resistance and greater load-bearing capacity, and uniform stress distribution, which can well solve the contradiction between K value and stress generated by a single string, and has a better use effect;

[0046] (2) The present invention bends the lower spring sheet through a machine, and after bending, the spring sheet forms a 3D pattern. After the lower spring sheet is assembled, the assembly ring is removed to form four independent current loop devices; the four corner brackets can be independently driven to move the X / Y axis through the suspension magnetic effect. The assembly structure and assembly method are simple in process, the spring sheet structure is strong, and the quality of the product is improved;

[0047] (3) The base of the present invention is first subjected to metal stamping to form a 3D circuit orientation line, and then the metal is fixed together by injection molding to form two bases respectively, and then the two molded parts are buckled together by dispensing glue and positioning pins to achieve the same layered circuit purpose as the flexible board. By using a mold to stamp a 3D metal circuit combined with an injection molding machine for layered injection molding, and then buckling through the positioning pin holes, two different circuit board surfaces are combined together to form a 3D circuit base, which effectively avoids the problems of complicated process, low efficiency, panel deformation, etc. caused by the installation of a flexible circuit board. By using an integrated 3D circuit base, the operating efficiency is improved, the labor cost is reduced, and the quality and reliability of the product are improved;

[0048] (4) The present invention uses silver paste to weld the lower spring sheet and the base, which not only ensures the power-on effect of the product, but also improves the operating efficiency, reduces the material cost and equipment cost, improves the reliability of the product, ensures the cleanliness of the product, and improves the product quality;

[0049] (5) The bracket structure of the present invention embeds a conductor during the injection molding of the bracket, and uses conductive silver paste, solder paste, and laser welding to connect the upper spring sheet, the lower spring sheet, and the conductor structure embedded in the bracket. Compared with the existing external wiring method, this solves the problems that have been plaguing the industry, such as the complicated assembly process that easily causes damage to parts, the risk of chipping, and high manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is an isometric view of the overall assembly of the present invention;

[0051] Figure 2 It is a schematic diagram of the structure of the present invention in which the entire shaft side is placed vertically;

[0052] Figure 3 It is an axonometric view of the present invention in which the whole is placed obliquely;

[0053] Figure 4 It is a multi-angle schematic diagram of the entire lower spring sheet of the present invention, wherein part a is an isometric view, part b is a top view, and part c is a side view for showing the bent ribs;

[0054] Figure 5 It is a schematic diagram of the assembly of a zoom assembly for controlling Z-axis movement of the present invention;

[0055] Figure 6 The present invention Figure 5 A top view of the structure;

[0056] Figure 7 It is a schematic diagram of the state in which the bracket and the circuit body structure in the bracket of the present invention are moved outward;

[0057] Figure 8 The present invention Figure 7 A is a local enlarged schematic diagram;

[0058] Fig. 9 It is a perspective view of the bracket of the present invention, which is mainly used to view the placement of the internal circuit body;

[0059] Fig.10 The present invention Figure 5 Bottom view of the structure to see where and how the magnets are set;

[0060] Fig.11 It is a schematic diagram of the disassembled structure of the entire dynamic module of the present invention;

[0061] Fig.12 The present invention Fig.11 The local enlarged schematic diagram of B in the figure is mainly used to show the local structure of the upper spring body;

[0062] Fig.13 is a multi-angle schematic diagram of the lower base assembly in the present invention, wherein part a is an isometric view of the lower base assembly, part b is a top view of the lower base assembly, part c is a top view of a lower base circuit provided in the lower base assembly, and part d is a side view of a circuit structure provided in the lower base assembly;

[0063] Fig.14is a multi-angle schematic diagram of the upper base assembly in the present invention, wherein part a is an isometric view of the upper base assembly, part b is a top view of the upper base assembly, part c is a top view of an upper base circuit disposed in the upper base assembly, and part d is a side view of a circuit structure disposed in the upper base assembly;

[0064] Fig.15 1 is a schematic diagram of multiple states of an upper bottom assembly with an integrated winding assembly in the present invention, wherein part a is an axial side schematic diagram of the integrated winding assembly, part b is a partial enlarged view of part a, part c is a top view of the upper bottom assembly with an integrated winding assembly, and part d is a side view of the upper bottom assembly with an integrated winding assembly;

[0065] Fig.16 These are the X, Y, and Z axis directions used to display the overall structure in the present invention.

[0066] In the figure: 1-shell, 2-base, 2.1-lower bottom assembly, 2.2-lower bottom circuit, 2.3-upper bottom assembly, 2.4-upper bottom circuit, 2.5-winding body, 2.6-integrated winding group, 3-bracket, 3.1-circuit body, 4-carrier, 5-upper spring sheet, 5.1-upper string wire, 6-lower spring sheet, 6.1-bending rib, 6.2-double string wire, 6.3-assembly ring, 6.4-inner fixed end, 6.5-middle fixed end, 6.6-outer fixed end, 7-magnet, 8-coil, 9-IC slot, 10-feedback magnet. DETAILED DESCRIPTION

[0067] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0068] Embodiment 1:

[0069] The present embodiment discloses a closed-loop VCM motor with an OIS function. The so-called VCM motor is a voice coil motor, which is an electrically controlled motion component that is controlled by an electromagnetic component and uses the principle of electromagnetic induction to achieve directional movement of a lens module. The so-called electromagnetic component controls the movement of the moving structure relative to the fixed structure through an electromagnetic coil 8 and an elastic mechanism provided between an moving structure and a fixed structure.

[0070] Generally, a permanent magnet 7 is provided on the fixed structure to form a permanent magnetic field, and the direction of the action structure is controlled by energizing the coil 8 and controlling the direction and size of the incoming direct current. However, in the prior art, a plurality of spring sheets are also provided, wherein each spring sheet is provided with a string structure with a certain lever arm length, and a better restoring effect is provided by the string mechanism with a longer length. However, most of the prior art adopts a single string structure, which is too wide, resulting in large resistance of the entire spring sheet, large structural stress, and unsatisfactory imaging effect of the lens module; and if the width of a single string is reduced, it will be easy to break during the experiment due to its small size, which will affect the product structure and poor use effect.

[0071] In order to solve this technical problem, the present embodiment is specifically a closed-loop voice coil motor with OIS function, including a moving module and a fixed module. The moving module is connected to the fixed module through a spring sheet group and reaches a suspended state without being affected by external force. The lens module is arranged on the moving module and the anti-shake and focusing functions are realized by the directional movement of the moving module relative to the fixed module.

[0072] The moving module is provided with a coil 8 energized by an external power source, so that the moving module is forced to move in a directional manner in the magnetic field, and the displacement is fed back and guided by a feedback component arranged on the moving module; the spring sheet group includes a lower spring sheet 6, one end of the lower spring sheet 6 is fixed on the fixed module, and the other end is fixed on the moving module. The lower spring sheet 6 is provided with a double string 6.2 connecting the two fixed ends and providing elastic restoring force in the Z-axis direction.

[0073] The lower spring sheet 6 includes a plurality of lower elastic bodies, which are arranged between the fixed module and the moving module at equal central angles around the axis of the lens module; the lower elastic body includes an inner fixed end 6.4, a middle fixed end 6.5 and an outer fixed end 6.6; the inner fixed end 6.4 is connected to the carrier 4, the middle fixed end 6.5 is connected to the bracket 3, and a double string wire 6.2 is provided between the inner fixed end 6.4 and the middle fixed end 6.5; the outer fixed end 6.6 is connected to the fixed module, and a bending rib 6.1 is provided between the middle fixed end 6.5 and the outer fixed end 6.6.

[0074] The technical problem solved by the double string 6.2 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 more gentle, which solves the contradictory problem of increased stress caused by the increase in the spring elastic coefficient, and is more suitable for the control of the coil 8 in the voice coil motor, solving the technical problem of large internal stress and difficulty in adjustment. At the same time, because two strings are subjected to force at the same time, they are stronger and more reliable than a single thin string, and are not prone to abnormal breakage. During the installation process, the self-deformation is also small, which is also more conducive to installation, improving assembly efficiency and the problem of axial inclination in product characteristics.

[0075] Among them, the moving module includes a movably connected bracket 3 and a carrier 4, and the carrier 4 performs reciprocating linear displacement relative to the bracket 3 along the Z axis on the bracket 3; and the spring sheet group is arranged between the bracket 3 and the carrier 4 to provide a restoring force; the bracket 3 is movably connected to the fixed module and moves in the XOY plane with the fixed module as a reference; a magnet 7 for forming a magnetic field is provided on the bracket 3.

[0076] The fixed module includes a base 2, one side of which is provided with a shell 1 for buckling the moving module on the base 2; an integrated winding group 2.6 is provided on the base 2, and a relative thrust is generated by the integrated winding group 2.6 and the structure forming a magnetic field on the moving module, causing the moving module to move along the XOY plane on the base 2 to offset the shaking of the lens module.

[0077] The lower spring sheet 6 also includes a bending rib 6.1 that bends and extends toward the Z axis. The angle between the bending rib 6.1 and the plane where the double string wire 6.2 is located is not zero and is used to provide the moving module with elastic restoring force in the plane where the X axis and the Y axis are located.

[0078] like Figure 4 As shown, there are multiple angles of the lower spring sheet 6, in which it can be seen that the lower spring sheet 6 is composed of four lower elastic bodies, and each lower elastic body has the same shape and size. Although splitting into multiple parts can provide a more uniform and stable rebound effect, because a multi-piece structure is used for assembly, not only the assembly efficiency is reduced during assembly, but also because the parts are too small, errors are easily made during assembly, resulting in a reduction in yield. In order to avoid the reduction in assembly efficiency caused by the use of a multi-piece structure, the present invention is provided with a separate assembly ring 6.3 structure on the outside of the entire lower spring sheet 6. It can be seen in part b of the figure that the structure is made of a material integrally formed with the lower spring sheet 6, has a large area and width, and can connect multiple upper elastic bodies of the lower spring sheet 6 to form an integrated structure. During assembly, the assembly ring 6.3 is directly clamped so that all upper elastic bodies are fixed on the assembly ring 6.3 for assembly together, thereby eliminating multiple fixing steps. After the entire lower spring sheet 6 is fixed, the connection between the assembly ring 6.3 and each upper elastic body is cut off, and the assembly is complete.

[0079] Because the processing accuracy of the existing technology cannot be fully guaranteed, the material is prone to breakage in the reliability test under this width, resulting in defective products. At the same time, since the plane design method cannot improve the strength of the structure when the width is too narrow, the supporting effect of the suspended bracket 3 is limited, and the weight of the overall structure is increased.

[0080] The present invention has a bending rib 6.1 structure, which can have better structural strength than the existing flat spring sheet, and is used to provide better elastic restoring force in the XOY plane. As shown in the figure, it can be seen that the bending rib 6.1 is arranged on the periphery of the entire lower spring sheet 6, and after installation, the bending rib 6.1 is bent upward to form a metal sheet body of equal width compared to the double string wire 6.2 structure, and because the bending rib 6.1 is a ring structure, the bending rib 6.1 is not only folded upward by 90 degrees, but also bent in the Z-axis direction to form a ring structure, and wrinkles are provided at the bending position, thereby enhancing the structural strength.

[0081] Embodiment 2:

[0082] The present embodiment is a closed-loop voice coil motor with OIS function, including a moving module and a fixed module. The moving module and the fixed module are connected by a spring sheet group and reach a suspended state when not subjected to external force. The lens module is arranged on the moving module and the anti-shake and focusing functions are realized by the directional movement of the moving module relative to the fixed module.

[0083] The moving module is provided with a coil 8 energized by an external power source, so that the moving module is forced to move in a directional manner in the magnetic field, and the displacement is fed back and guided by a feedback component arranged on the moving module; the spring sheet group includes a lower spring sheet 6, one end of the lower spring sheet 6 is fixed on the fixed module, and the other end is fixed on the moving module. The lower spring sheet 6 is provided with a double string 6.2 connecting the two fixed ends and providing elastic restoring force in the Z-axis direction.

[0084] The moving module includes a bracket 3 and a carrier 4 that are movably connected. The carrier 4 moves back and forth linearly relative to the bracket 3 on the bracket 3 in the direction of the Z axis. The spring sheet group is arranged between the bracket 3 and the carrier 4 to provide a restoring force. The bracket 3 is movably connected to the fixed module and moves in the XOY plane with the fixed module as a reference. The bracket 3 is provided with a magnet 7 that forms a magnetic field. The spring sheet group includes a lower spring sheet 6 and an upper spring sheet 5. The lower spring sheet 6 is connected to the base 2, the bracket 3 and the carrier 4 at the same time, while the upper spring sheet 5 is only connected to the bracket 3 and the carrier 4, mainly providing a zoom rebound force in the Z axis direction. The fixed module includes a base 2, and a housing 1 is provided on one side of the base 2 to buckle the moving module on the base 2; an integrated winding group 2.6 is provided on the base 2, and a relative thrust is generated by the integrated winding group 2.6 and the structure forming a magnetic field on the moving module, so that the moving module moves along the XOY plane on the base 2 to offset the shaking of the lens module.

[0085] like Fig.15As shown, the base 2 includes an upper base component 2.3 and a lower base component 2.1 that are interlocked, and contacts and pins are provided on the upper base component 2.3 and the lower base component 2.1. The integrated winding group 2.6 is provided on the surface of the upper base component 2.3 and is electrically connected to the contacts provided on the surface of the upper base component 2.3. An upper base circuit 2.4 is provided inside the upper base component 2.3, and one end of the upper base circuit 2.4 is connected to the contact of the upper base component 2.3, and the other end is connected to the pin of the upper base component 2.3;

[0086] A lower circuit 2.2 is provided in the lower component 2.1; one end of the lower circuit 2.2 is connected to a contact of the lower component 2.1, and the other end is connected to a pin of the lower component 2.1;

[0087] The upper circuit 2.4 and the lower circuit 2.2 are both conductive structures formed by die stamping, and corresponding layered structures are formed by injection molding.

[0088] Among them, the two parts of the base 2 are formed by layered injection molding by using a mold to stamp a 3D metal circuit and an injection molding machine, and then buckled together through positioning pin holes to combine two different circuit board surfaces together to form a 3D circuit base 2, which effectively avoids the problems of complicated process, low efficiency, panel deformation, etc. caused by the installation of flexible circuit boards. By using an integrated 3D circuit base 2, the operating efficiency is improved, the labor cost is reduced, and the quality and reliability of the product are improved.

[0089] Specifically, metal stamping is first performed to make the 3D circuit routing lines, and then the metal is fixed together by injection molding to make two base 2 parts respectively, and then the two molded parts are fastened together by gluing and positioning pins to achieve the same layered circuit purpose as the flexible board.

[0090] A plurality of contacts are arranged on the surface of the upper base component 2.3, so that the lower spring sheet 6 can be connected to conduct electricity and the current entering from the pin can be introduced into the corresponding coil 8, so as to achieve the effect of built-in conduction. The integrated winding assembly 2.6 is a ring structure formed by a single metal conductor, and a plurality of winding coils 8 are formed on the integrated winding assembly 2.6 by directional winding, and the winding coils 8 are taut straight conductor segments. Because the integrated winding assembly 2.6 is a structure formed by winding a single copper wire, in order to facilitate fixing the two ends of the copper wire, the ends are wound into a cylindrical structure, i.e. Fig.10 The winding body in 2.5.

[0091] The straight conductor segments are fixed by fitting them to the corresponding contacts on the surface of the upper base component 2.3, and when the straight conductor segments at both ends of each winding coil 8 are welded to the corresponding contacts, four independent winding coils 8 are formed by cutting between the two contacts of the same straight conductor. In other words, the integrated winding assembly 2.6 is first directly fixed on the base 2 as a whole by injection molding, and the straight conductor segments are passed through all the contacts, and the straight conductor segments near the two ends of each winding coil 8 are fixed by a plastic fixing structure, and a cutting groove is made in the middle of the two fixing points of the same straight conductor segment. After welding, the copper wire is cut at the position of the dividing groove to make the four winding coils 8 independent, and the welding feet are welded with other products to form independent current loops, so that the product can achieve the purpose of controlling the current size separately.

[0092] Embodiment 3:

[0093] This embodiment is optimized and limited based on the above embodiment 2, such as Figure 1-15 As shown, a circuit body 3.1 formed of a conductive material is provided in the bracket 3, and the circuit body 3.1 is injection molded together with the material constituting the bracket 3. The bracket 3 is provided with an upper spring sheet 5 for connecting to the carrier 4, and the upper spring sheet 5 includes an upper string wire 5.1 for providing elastic restoring force; a plurality of mounting grooves for fixing the magnet 7 are provided at the lower part of the bracket 3; the feedback assembly includes a feedback magnet 10 provided on the carrier 4, and also includes a Hall sensor provided on the bracket 3, and the Hall sensor is provided in an IC slot 9 opened on the inner wall of the bracket 3.

[0094] In order to avoid the problem of increasing the overall volume due to the separate setting of the conductive circuit part, this embodiment modifies the existing PCB or flexible cable method into a circuit structure formed by direct injection molding of conductive materials through an integrated casting method. If a PCB or FPC flexible cable method is used, a separate space needs to be set up for installation. For such micro-devices, assembly jigs are generally used for assembly. If multiple independent connection components are set up separately, it will not only reduce the assembly efficiency, but also affect the yield. The direct casting method of conductive materials used in this embodiment forms a regular physical circuit belt in the bracket 3. Then, during installation, you only need to fix the components and the connection structure that needs to be welded is already in the same position, so it can be directly spot welded, which is convenient and quick.

[0095] Among them, the bracket 3 is an annular structure. Compared with the existing method of embedding metal conductors, the original injection molding process allows the circuit body 3.1 to be more tightly connected to the bracket 3. The two annular opening end faces are respectively provided with an upper solder point opening and a lower solder point opening. The circuit body 3.1 passes through the upper solder point opening and is provided with an upper solder point at the end; the circuit body 3.1 passes through the lower solder point opening and is provided with a lower solder point at the end. In the entire voice coil motor, the bracket 3 structure is provided with an upper spring sheet 5 structure, and the lower part is connected to a lower spring sheet 6 structure. Both spring sheets are made of metal conductive materials, which can not only provide a limiting restoring force to the movable part, but also are used to conduct the circuit between the fixed part and the movable part.

[0096] Because the support 3 structure in this embodiment can be used in a separate closed-loop motor, it can also be applied to a voice coil motor with integrated OIS planar anti-shake function. The voice coil motor in this embodiment is integrated with the OIS function, so the support 3 is also in a horizontal suspension state relative to the base 2, and can only be connected to the circuit inside the support 3 structure through the lower spring sheet 6. If it is only a voice coil motor with a zoom adjustment function, the support 3 can be fixed on the base 2, and a conductive structure connected to the internal circuit of the support 3 structure is provided on the base 2.

[0097] The upper welding point and the lower welding point are both welding positions for connecting to the external circuit, which are generally planar structures. In order to distinguish the functional differences of the corresponding welding points during injection molding, corresponding contact marks can be printed on the surface of the welding points, so as to facilitate quick assembly during assembly. Because the coil 8 is fixed on the carrier 4, the inner circle positioning hole of the upper spring sheet 5 is fixed on the upper surface of the carrier 4, and the upper spring sheet 5 is welded to the copper wire winding column of the carrier 4. The outer positioning hole of the upper spring sheet 5 is fixed on the bracket 3, and the outer welding notch of the upper spring sheet 5 is welded to the welding point on the bracket 3 using conductive silver glue; the inner side of the lower spring sheet 6 is fixed to the lower end face of the carrier 4 using glue, and the inner welding notch of the lower spring sheet 6 is also welded with conductive silver paste to the lower welding point of the bracket 3, and the outer welding notch of the lower spring sheet 6 is welded to other components, thereby forming a current loop.

[0098] The coil 8 is nested in the lower part of the carrier 4 , and a controllable current flows into the coil 8 through the conduction of the upper spring sheet 5 . The coil 8 then moves linearly in a directional manner in the magnetic field formed by the four magnets 7 , thereby achieving the Z-axis focusing effect.

[0099] The present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A closed-loop voice coil motor with OIS function, arranged in a camera module for controlling zoom and anti-shake of a lens module, characterized in that: It comprises a moving module and a fixed module, wherein the moving module and the fixed module are connected via a spring sheet group and are in a suspended state without being acted upon by external forces, and the lens module is arranged on the moving module and the anti-shake and focus functions are realized by the directional movement of the moving module relative to the fixed module; The moving module is provided with a coil energized by an external source so that the moving module is subjected to force and moves in a directional manner in a magnetic field, and a feedback component provided on the moving module is used to measure the displacement of the lens module and provide feedback guidance; The spring sheet group comprises a lower spring sheet (6), one end of the lower spring sheet (6) being fixed on the fixed module and the other end being fixed on the movable module, and a double string (6.2) connecting the two fixed ends and providing elastic restoring force in the Z-axis direction is provided on the lower spring sheet (6).

2. The closed-loop voice coil motor with OIS function according to claim 1, characterized in that: The lower spring sheet (6) further comprises a bending rib (6.1) that is bent and extends toward the Z axis, the angle between the bending rib (6.1) and the plane where the double string wire (6.2) is located is not zero and is used to provide the moving module with an elastic restoring force in the plane where the X axis and the Y axis are located.

3. The closed-loop voice coil motor with OIS function according to claim 2, characterized in that: The moving module comprises a support (3) and a carrier (4) which are movably connected, the carrier (4) being capable of reciprocating linear displacement on the support (3) relative to the support (3) in the direction of the Z axis; and the spring sheet group is arranged between the support (3) and the carrier (4) to provide a restoring force; The bracket (3) is movably connected to the fixed module and moves in the XOY plane with the fixed module as a reference; The bracket (3) is provided with a magnet (7) for forming a magnetic field.

4. The closed-loop voice coil motor with OIS function according to claim 3, characterized in that: The lower spring sheet (6) comprises a plurality of lower spring bodies, and the lower spring bodies are arranged between the fixed module and the movable module at equal central angles around the axis of the lens module; The lower body comprises an inner fixed end (6.4), a middle fixed end (6.5), and an outer fixed end (6.6); The inner fixing end (6.4) is connected to the carrier (4), the middle fixing end (6.5) is connected to the bracket (3), and a double string (6.2) is provided between the inner fixing end (6.4) and the middle fixing end (6.5); The outer fixing end (6.6) is connected to the fixing module, and a bending rib (6.1) is provided between the middle fixing end (6.5) and the outer fixing end (6.6).

5. A closed-loop voice coil motor with OIS function according to claim 3 or 4, characterized in that: The fixed module comprises a base (2), and a shell (1) for buckling the moving module onto the base (2) is provided on one side of the base (2); An integrated winding group (2.6) is provided on the base (2), and a relative thrust is generated by the integrated winding group (2.6) and the magnet (7) so that the moving module moves along the XOY plane on the base (2) to offset the shaking of the lens module.

6. The closed-loop voice coil motor with OIS function according to claim 5, characterized in that: The base (2) comprises an upper base component (2.3) and a lower base component (2.1) which are interlocked, the upper base component (2.3) and the lower base component (2.1) are both provided with contacts and pins, and the integrated winding assembly (2.6) is arranged on the surface of the upper base component (2.3) and is electrically connected to the contacts arranged on the surface of the upper base component (2.3).

7. The closed-loop voice coil motor with OIS function according to claim 6, characterized in that: An upper bottom circuit (2.4) is provided in the upper bottom component (2.3); one end of the upper bottom circuit (2.4) is connected to a contact of the upper bottom component (2.3), and the other end is connected to a pin of the upper bottom component (2.3); A lower circuit (2.2) is provided in the lower bottom component (2.1); one end of the lower circuit (2.2) is connected to a contact of the lower bottom component (2.1), and the other end is connected to a pin of the lower bottom component (2.1); The upper circuit (2.4) and the lower circuit (2.2) are both conductive structures formed by die stamping, and corresponding layered structures are formed by injection molding.

8. The closed-loop voice coil motor with OIS function according to claim 6, characterized in that: The integrated winding assembly (2.6) is a single metal conductor forming an annular structure, a plurality of winding coils are formed on the integrated winding assembly (2.6) by directional winding, and between the winding coils are taut straight conductor segments; The straight conductor segments are fixed on the corresponding contacts on the surface of the upper base component (2.3), and when the straight conductor segments at both ends of each winding coil are welded on the corresponding contacts, four independent winding coils are formed by cutting between the two contacts of the same straight conductor.

9. The closed-loop voice coil motor with OIS function according to claim 5, characterized in that: A circuit body (3.1) formed of a conductive material is provided in the bracket (3), and the circuit body (3.1) is injection molded together with the material constituting the bracket (3).

10. The closed-loop voice coil motor with OIS function according to claim 5, characterized in that: An upper spring sheet (5) for connecting to the carrier (4) is provided on the bracket (3), and the upper spring sheet (5) comprises an upper string wire (5.1) for providing elastic restoring force; The lower part of the bracket (3) is provided with a plurality of mounting grooves for fixing the magnets (7); The feedback component comprises a feedback magnet (10) arranged on a carrier (4), and also comprises a Hall sensor arranged on a bracket (3), wherein the Hall sensor is arranged in an IC slot (9) opened on an inner wall of the bracket (3).

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