Lead frame, voice coil motor and camera module thereof

Abstract

The invention discloses a lead frame. The lead frame comprises a fixed frame; the movable frame is movably connected to the fixed frame; the bending assembly comprises a plurality of bending parts, the bending parts are arranged between the fixed frame and the movable frame in a central symmetry mode so that the movable frame can be supported in the middle of the fixed frame, each bending part is provided with a plurality of sections and a plurality of bending parts, and the rigidity of at least one bending part is larger than that of other bending parts; the bent parts are in transition connection with the adjacent sections, so that the extending direction of the two adjacent sections is changed, and the two ends of the bent parts are connected with the free side of the fixed frame and the free side of the movable frame respectively. The multiple sections and the multiple bending parts are arranged, and the rigidity of at least one bending part is larger than that of other bending parts, so that the bending parts have flexibility and restoring force, the movable frame can be supported to move or rotate relative to the fixed frame, and meanwhile the movable frame can be more easily kept or restored to the original position.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a lead frame, a voice coil motor and a camera module thereof. Background Art

[0002] Electronic devices have gradually become an indispensable social and entertainment tool in people's daily lives, and people's requirements for electronic devices are getting higher and higher. In terms of photography, people are increasingly interested in the performance of camera anti-shake in order to obtain photos with higher image quality. People expect to install small-sized, high-pixel camera modules with both autofocus function (hereinafter referred to as AF function, Auto Focus) and optical image stabilization function (hereinafter referred to as OIS function: Optical Image Stabilization) on portable devices such as smartphones and tablets to obtain better image quality.

[0003] The AF function is to use a motor to make a bracket with a lens move linearly in the direction of the optical axis to focus on the subject and produce a clear image at the image sensor (CMOS, CCD, etc.) located behind the lens. When the lens assembly moves along the optical axis or is affected by external factors, the lens assembly will move unexpectedly in the plane perpendicular to the optical axis. The OIS function can compensate for the unexpected movement of the lens assembly to improve the image clarity. However, driving the lens assembly to move to achieve the OIS function requires a relatively large driving force, and the volume of the driving assembly is relatively large. Summary of the invention

[0004] One object of the present invention is to provide a lead frame, which mechanically and electrically connects a movable frame to a movable frame through a plurality of centrally symmetrical flexures of a flexure assembly, and provides a plurality of sections and a plurality of bending portions so that the flexure assembly has both rigidity and flexibility. By making at least one bending portion more rigid than the other bending portions, the restoring force of the flexure arm is increased, and the movable frame is easier to maintain or return to its original position.

[0005] Another object of the present invention is to provide a voice coil motor, which enables an image sensor to move in a plane perpendicular to the optical axis through the lead frame to compensate for unexpected movement of a lens assembly.

[0006] Another object of the present invention is to provide a camera module, which can realize the OIS function with a smaller driving force by applying the above-mentioned voice coil motor, thereby improving the imaging quality.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a lead frame, comprising: a fixed frame; a movable frame, the movable frame being movably connected to the fixed frame; a flexure assembly, the flexure assembly comprising a plurality of flexure portions, the flexure portions being centrally symmetrically arranged between the fixed frame and the movable frame, so as to support the movable frame in the middle of the fixed frame, wherein the flexure portion is provided with a plurality of sections and a plurality of bending portions, the stiffness of at least one of the bending portions being greater than the stiffness of the other bending portions, and each of the bending portions transitionally connects adjacent sections, so as to change the extension direction of two adjacent sections, so that the two ends of the flexure portion are respectively connected to the free side of the fixed frame and the free side of the movable frame.

[0008] In one embodiment of the present application, each of the flexure portions includes a lead-out portion and a connecting portion, a plurality of the sections and a plurality of the bending portions are alternately arranged between the lead-out portion and the connecting portion, the lead-out portion is fixedly connected to the free side of the movable frame, the connecting portion is fixedly connected to the free side of the fixed frame, and the lead-out portion and the connecting portion are arranged on opposite sides.

[0009] In one embodiment of the present application, the plurality of sections include a first section, a second section, a third section and a fourth section, the plurality of bending portions include a first bending portion, a second bending portion and a third bending portion, the first bending portion integrally connects the first section and the second section, the second bending portion integrally connects the second section and the third section, and the third bending portion integrally connects the third section and the fourth section, so that the first section and the fourth section are arranged on non-opposite sides between the movable frame and the fixed frame.

[0010] In one embodiment of the present application, the first section and the third section are arranged along a first direction, the second section and the fourth section are arranged along a second direction, the first direction is arranged perpendicular to the second direction, the first bending portion transitionally connects the first section and the second section, so that the flexible section extends from the first direction to the second direction, the second bending portion transitionally connects the second section and the third section, so that the flexible section bends back from the second direction to the first direction, and the third bending portion transitionally connects the third section and the fourth section, so that the flexible section extends from the first direction to the second direction.

[0011] In one embodiment of the present application, the flexure portion includes a plurality of flexure arms, adjacent flexure arms are separated by air gaps, the flexure arms are arranged parallel to each other in the section, an angle of the flexure arm from inside to outside in the bending direction at the first bending portion is δ1, an angle of the flexure arm from inside to outside in the bending direction at the second bending portion is δ2, and an angle of the flexure arm from inside to outside in the bending direction at the third bending portion is δ3, and δ1 is greater than δ2.

[0012] In an embodiment of the present application, the flexure arm includes an insulating layer, a conductive layer and a base layer stacked sequentially, so that the moving frame is mechanically and electrically connected to the fixed frame.

[0013] In one embodiment of the present application, the flexure portion also includes a lapel portion, which is arranged in the air gap to mechanically connect two adjacent flexure arms, and the lapel portion includes a plurality of first lapel parts and a plurality of second lapel parts, and the first lapel parts and the second lapel parts are staggered in the extension direction of the flexure arm, and each of the first lapel parts and each of the second lapel parts are spaced apart in the arrangement direction to connect two adjacent flexure arms.

[0014] In one embodiment of the present application, the first collar parts are arranged in a row at the second bending portion, the second collar parts are arranged in a row at the second section and adjacent to the second bending portion, and the second collar parts are arranged in a row at the third section and adjacent to the second bending portion.

[0015] In one embodiment of the present application, the first collar component is respectively disposed at the center line of the second section and the center line of the third section.

[0016] In one embodiment of the present application, the δ2 ​​is 0° or 180°, or δ2>δ3, or δ1=δ3>δ2.

[0017] In one embodiment of the present application, the first bending portion transitions in an arc shape to connect the first section and the second section, the second bending portion transitions in a straight line to connect the second section and the third section, and the third bending portion transitions in an arc shape to connect the third section and the fourth section, so that the stiffness of the second bending portion is greater than the stiffness of the first bending portion and the third bending portion.

[0018] According to a second aspect of the present application, a voice coil motor comprises: a lead frame as described above; an image sensor, wherein the image sensor is disposed on the movable frame of the lead frame and is mechanically and electrically connected to the fixed frame of the lead frame through the flexure; and a drive component, wherein the drive component is disposed on the movable frame so that the image sensor moves along with the movable frame relative to the fixed frame in a plane direction perpendicular to the optical axis.

[0019] According to the third aspect of the present application, a camera module includes: a lens assembly, equipped with at least one lens; a focus motor, the focus motor is placed on the outside of the lens assembly; the voice coil motor as described above, the voice coil motor is located below the lens assembly, so that the image sensor is sensitive to light and forms an image.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] (1) The movable frame is supported and connected to the fixed frame by a plurality of centrally symmetrical flexures, and when the movable frame rotates, the force distribution of the lead frame is relatively uniform. By providing a plurality of sections and a plurality of bending portions and at least one bending portion having a rigidity greater than that of the other bending portions, the flexure portion has both flexibility and restoring force, thereby supporting the movable frame to move or rotate relative to the fixed frame, and making it easier for the movable frame to remain or return to its original position;

[0022] (2) By using the lead frame in the voice coil motor, the image sensor mounted on the movable frame can be mechanically and electrically connected to the fixed frame, and the movable frame can be driven to move the image sensor in a plane perpendicular to the optical axis, thereby compensating for unexpected movement of the lens assembly and improving the imaging quality of the camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a top view of a lead frame according to some embodiments of the present application;

[0024] Figure 2 is a top view of a lead frame according to some other embodiments of the present application;

[0025] Figure 3 is a partial enlarged view of a lead frame according to some embodiments of the present application;

[0026] Figure 4 is a partial enlarged view of a lead frame according to some other embodiments of the present application;

[0027] Figure 5 is a partial enlarged view of a lead frame according to some other embodiments of the present application;

[0028] Figure 6is a partial enlarged view of a lead frame according to some other embodiments of the present application;

[0029] Figure 7 is a partially enlarged structural diagram of a lead frame according to some embodiments of the present application;

[0030] Figure 8 is a schematic diagram of the arrangement of the collar parts of the lead frame according to some embodiments of the present application;

[0031] Fig. 9 is a schematic diagram of the arrangement of the collar parts of the lead frame according to other embodiments of the present application;

[0032] Fig.10 It is a schematic diagram of the structure of a camera module according to some embodiments of the present application.

[0033] In the figure: 1. lead frame; 2. fixed frame; 3. movable frame; 31. resistor and capacitor component; 4. flexure assembly; 5. flexure; 51. segment; 511. first segment; 512. second segment; 513. third segment; 514. fourth segment; 52. bending portion; 521. first bending portion; 522. second bending portion; 523. third bending portion; 53. flexure arm; 531. insulating layer; 532. conductive layer; 533. base layer; 54. collar portion; 541. first collar component 541; 542. second collar component 542; 55. air gap; 561. lead-out portion; 562. connection portion; 6. voice coil motor; 61. image sensor; 62. drive assembly; 621. magnet; 622. coil; 7. camera module; 71. lens assembly; 72. focus motor. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0035] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0037] In the description of the present invention, it is also necessary to explain 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, a contact connection, or an indirect connection through an intermediate medium, and it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] like Figure 1-Figure 3As shown, a lead frame 1 includes a fixed frame 2, a mobile frame 3 and a flexure assembly 4, wherein the fixed frame 2 is located on the peripheral side of the mobile frame 3, the mobile frame 3 is movably connected to the fixed frame 2, and the flexure assembly 4 includes a plurality of flexures 5, wherein the flexures 5 are centrally symmetrically arranged between the fixed frame 2 and the mobile frame 3, so that the mobile frame 3 is supported in the middle of the fixed frame 2. The side of the mobile frame 3 facing the fixed frame 2 is the free side of the mobile frame 3, and the side of the fixed frame 2 facing the mobile frame 3 is the free side of the fixed frame 2, that is, the free side of the fixed frame 2 is located on the inner side of the fixed frame 2, and the free side of the mobile frame 3 is located on the outer side of the mobile frame 3. The flexure 5 is provided with a plurality of sections 51 and a plurality of bends 52, and the rigidity of at least one of the bends 52 is greater than the rigidity of the other bends 52. When the mobile frame 3 rotates and moves relative to the fixed frame 2 to cause the flexure 5 to be twisted and deformed, the bends 52 with greater rigidity can provide a greater restoring force, so that the flexure 5 returns to its original state, and further the mobile frame 3 returns to its original position, thereby improving the reliability of the lead frame 1. Each bend 52 transitionally connects the adjacent sections 51, so as to change the extension direction of the two adjacent sections 51, so that the two ends of the flexure 5 are respectively connected to the free side of the fixed frame 2 and the free side of the mobile frame 3. It is understandable that, under normal circumstances, the deformation of the section 51 located in the middle of the flexure 5 is greater than the deformation of the sections 51 located at both ends of the flexure 5. By increasing the rigidity of the bending section 52 located in the middle of the flexure 5, the rigidity of the bending section 52 in the middle is made greater than the rigidity of other bending sections 52, so that the restoring force of the bending section 52 in the middle is increased, and the deformation of the sections 51 on both sides of the bending section 52 in the middle is reduced, which is conducive to the flexure 5 to maintain or restore the original state, and improve the reliability of the lead frame 1. It is worth mentioning that the multiple flexures 5 are centrally symmetrically arranged, which is conducive to balancing the size of the lead frame 1.

[0039] In some embodiments, the flexure portion 5 includes a lead-out portion 561 and a connecting portion 562, the lead-out portion 561 is fixedly connected to the free side of the movable frame 3, the connecting portion 562 is fixedly connected to the free side of the fixed frame 2, and a plurality of the sections 51 and a plurality of the bending portions 52 are alternately arranged between the lead-out portion 561 and the connecting portion 562, so that the lead-out portion 561 and the connecting portion 562 are arranged on opposite sides. Specifically, the free side of the fixed frame 2 is located on the inner side of the fixed frame 2, and the free side of the mobile frame 3 is located on the outer side of the mobile frame 3. The connecting portion 562 located at one end of the flexible portion 5 is fixedly connected to one of the side edges of the free side of the mobile frame 3. The multiple bending portions 52 change the extension direction of the multiple sections 51 so that the flexible portion 5 crosses the corners of the adjacent two side edges of the mobile frame 3, so that the lead-out portion 561 located at the other end of the flexible portion 5 is fixedly connected to one of the side edges of the free side on the fixed frame 2, wherein the side edge of the mobile frame 3 where the connecting portion 562 is located and the side edge of the fixed frame 2 where the lead-out portion 561 is located have extension lines that intersect, that is, the connecting portion 562 and the lead-out portion 561 are respectively located on opposite sides of the mobile frame 3. The plurality of flexures 5 are rotationally symmetrically arranged between the mobile frame 3 and the fixed frame 2, so as to respectively connect the plurality of sides of the mobile frame 3 and the plurality of sides of the fixed frame 2, so that when the mobile frame 3 rotates and moves relative to the fixed frame 2, the forces on the various flexures 5 are relatively uniform, thereby improving the reliability of the lead frame 1. It is worth mentioning that the resistor and capacitor components 31 on the mobile frame 3 are preferably arranged symmetrically, so that the mass center of the entire mobile frame 3 is closer to the geometric center of the mobile frame 3, so as to reduce the rotation of the mobile frame 3 relative to the fixed frame 2.

[0040] It can be understood that the connection between the connecting portion 562 and the mobile frame 3 forms a rotation axis. When the mass of the mobile frame 3 remains unchanged, the longer the distance between the equivalent mass point of the mobile frame 3 and the rotation axis, the greater the rotational inertia of the mobile frame 3. The distance from the equivalent mass point of the mobile frame 3 to the rotation axis can be increased to increase the inertia radius of the mobile frame 3, thereby increasing the strength of the mobile frame 3 during rotation, and further improving the stability and reliability of the lead frame 1. The equivalent mass point of the mobile frame 3 is usually close to the geometric center of the mobile frame 3. Therefore, compared with the center point of the side of the mobile frame 3 where the connecting portion 562 is connected, the non-center point of the side of the mobile frame 3 where the connecting portion 562 is connected can increase the rotational inertia of the mobile frame 3, thereby improving the stability and reliability of the mobile frame 3. When the mobile frame 3 is affected by an external force, the mobile frame 3 is easier to stay in place, or returns to its original position faster. It is worth mentioning that, compared with Figure 1 ,like Figure 2 As shown, when the connecting portion 562 is connected to the corner of the movable frame 3, the distance between the equivalent mass point of the movable frame 3 and the rotation axis is longer, so that the strength of the movable frame 3 during rotation is further increased, and when the lead frame 1 is impacted, the swinging impact of the flexure 5 can be more effectively reduced.

[0041] In some embodiments, the multiple sections 51 include a first section 511, a second section 512, a third section 513 and a fourth section 514, and the multiple bending portions 52 include a first bending portion 521, a second bending portion 522 and a third bending portion 523, the first bending portion 521 integrally connects the first section 511 and the second section 512, the second bending portion 522 integrally connects the second section 512 and the third section 513, and the third bending portion 523 is integrally connected between the third section 513 and the fourth section 514, so that the first section 511 and the fourth section 514 are arranged on non-opposite sides between the mobile frame 3 and the fixed frame 2. By increasing the stiffness of one of the bending portions 52 so that the stiffness of one of the bending portions 52 is greater than that of the other two bending portions 52, the restoring force of one of the bending portions 52 is increased, and the deformation of the sections 51 located on both sides of one of the bending portions 52 is reduced, which is beneficial for the flexure portion 5 to keep the movable frame 3 in place. Specifically, the first section 511 is fixedly connected to one side edge of the free side of the mobile frame 3, wherein the first bending portion 521, the second section 512 and the first section 511 are located on the same side of the mobile frame 3, and the second bending portion 522 crosses the corners of the adjacent two sides of the mobile frame 3, so that the fourth section 514 is fixedly connected to one side edge of the free side of the fixed frame 2, wherein the third section 513, the third bending portion 523 and the fourth section 514 are located on the other same side of the mobile frame 3, that is, the second bending portion 522 makes the first section 511, the first bending portion 521, the second section 512 and the fourth section 514, the third bending portion 523, and the third section 513 respectively located on adjacent sides of the mobile frame 3.

[0042] That is to say, the first section 511 is fixed to the movable frame 3, the fourth section 514 is fixed to the fixed frame 2, the first section 511 and the fourth section 514 are respectively located on two adjacent sides of the movable frame 3, so as to increase the extension length of the second section 512 and the third section 513, so that the flexibility of the flexure 5 is better, and the first bending portion 521, the second bending portion 522 and the third bending portion 523 are able to change the direction of the two adjacent sections 51, so that the flexure arm 53 can be twisted by force in multiple directions, thereby improving the flexibility of the flexure 5 and being able to withstand greater deformation. It can be understood that compared with the first section 511 and the fourth section 514, the deformation of the second section 512 and the third section 513 is larger. By increasing the stiffness of the second bending portion 522 so that the stiffness of the second bending portion 522 is greater than the stiffness of the first bending portion 521 and the third bending portion 523, the deformation of the second section 512 and the third section 513 can be reduced, so that when the mobile frame 3 is driven by an external force, the flexure arm 53 can provide a larger restoring force to keep the mobile frame 3 in place, or the mobile frame 3 can return to its original position faster when the external force is removed.

[0043] In some embodiments, Figure 3As shown, the first section 511 and the second section 512 are arranged along the first direction X, the second section 512 and the fourth section 514 are arranged along the second direction Y, the first direction X is arranged perpendicular to the second direction Y, the first bending portion 521 transitionally connects the first section 511 and the second section 512, so that the flexible portion 5 extends from the first direction X to the second direction Y, the second bending portion 522 transitionally connects the second section 512 and the third section 513, so that the flexible portion 5 is bent back from the second direction Y to the first direction X, and the third bending portion 523 transitionally connects the third section 513 and the fourth section 514, so that the flexible portion 5 extends from the first direction X to the second direction Y. Specifically, assuming that the extension direction of the flexible portion 5 is from the movable frame 3 to the fixed frame 2, the flexible portion 5 extends from the free side of the movable frame 3 along the first direction X in the first section 511. It can be understood that, within the plane where the lead frame 1 is located, the degree of freedom of the flexible portion 5 in the first section 511 is only in the second direction Y, that is, the first section 511 can only move and twist in the second direction Y; the first bending portion 521 allows the flexible portion 5 to extend from the first direction X to the second direction Y, that is, the flexible portion 5 extends along the second direction Y in the second section 512, and the degree of freedom of the flexible portion 5 in the second section 512 is the superposition of the first direction X and the second direction Y, that is, the second section 512 is able to move and twist within the plane of the lead frame 1; the second bending portion 522 allows the flexible portion 5 to bend back from the second direction Y to the first direction X, that is, the flexible portion 5 is in the third section 513 along The first direction X is extended, and the extension direction of the flexible portion 5 in the third section 513 is opposite to the extension direction in the first section 511, so as to enhance the ability of the flexible portion 5 to return to its original shape after being deformed by force. It can be understood that the degree of freedom of the flexible portion 5 in the third section 513 is still the superposition of the first direction X and the second direction Y, that is, the third section 513 can move and twist within the plane of the lead frame 1; the third bending portion 523 allows the flexible arm 53 to extend from the first direction X to the second direction Y, that is, the flexible portion 5 extends along the fourth direction in the fourth section 514, and the extension direction of the flexible portion 5 in the fourth section 514 is the same as the extension direction in the second section 512. It can be understood that since the fourth section 514 is fixed to the fixed frame 2, the degree of freedom of the fourth section 514 is mainly the first direction, that is, the fourth section 514 mainly moves and twists in the first direction X.

[0044] like Figure 4-Figure 6As shown, in some embodiments, the flexure 5 includes a plurality of flexure arms 53, and adjacent flexure arms 53 are separated by an air gap 55. The flexure arms 53 are arranged parallel to each other in each section 51, and an angle of the plurality of flexure arms 53 from inside to outside in the bending direction at the first bending section 521 is δ1, an angle of the plurality of flexure arms 53 from inside to outside in the bending direction at the second bending section 522 is δ2, and an angle of the plurality of flexure arms 53 from inside to outside in the bending direction at the third bending section 523 is δ3, and δ1 is greater than δ2, so that the stiffness of the second bending section 522 is greater than the stiffness of the first bending section 521, so that when the mobile frame 3 rotates or moves relative to the fixed frame 2, the distortion and deformation of the second section 512 and the third section 513 are smaller, thereby providing a more reliable reverse force effect, that is, it is more conducive to the flexure 5 to drive the mobile frame 3 to return to its original position.

[0045] like Figure 7 As shown, in some embodiments, the flexure arm 53 is provided with an insulating layer 531, a conductive layer 532 and a base layer 533 from top to bottom, so that the movable frame 3 is mechanically and electrically connected to the fixed frame 2. The insulating layer 531 and the base layer 533 are made of insulating materials, which may be polyimide, and the base layer 533 may also be made of titanium copper, so as to improve the flatness of the base layer 533 and increase the rigidity of the flexure arm 53, and at the same time make the lead frame 1 suitable for processing by etching process, reducing the processing difficulty, wherein the conductive layer 532 and the base layer 533 are bonded by adhesives such as glue. It is worth mentioning that the two ends of the conductive layer 532 are respectively welded to the circuit board of the movable frame 3 and the circuit board of the fixed frame 2. When the movable frame 3 moves and rotates the same relative to the fixed frame 2, compared with setting two or less bending portions 52, when three bending portions 52 are set, the deformation amount of each section 51 is relatively small, that is, the deformation amount of the first section 511 relative to the movable frame 3 is small, so that the welding point between the conductive layer 532 of the first section 511 and the movable frame 3 is reduced, and the deformation amount of the fourth section 514 relative to the fixed frame 2 is small, so that the welding point between the conductive layer 532 of the fourth section 514 and the fixed frame 2 is reduced, thereby improving the reliability of the lead frame 1.

[0046] like Figure 7-Figure 9As shown, in some embodiments, the flexure 5 further includes a collar portion 54, and the collar portion 54 is disposed in the air gap 55, so as to mechanically connect two adjacent flexure arms 53 to avoid mutual interference between the flexure arms 53. For example, in the case of falling or vibration, the collar portion can avoid collision or entanglement between the flexure arms 53. It is worth mentioning that the connection between the collar portion and the flexure arm 53 is arc-shaped. When the flexure arm 53 is deformed, the stress is evenly dispersed along the arc to avoid stress concentration, thereby improving the torsion resistance of the lead frame 1.

[0047] In some embodiments, the lapel portion 54 includes a plurality of first lapel pieces 541 and a plurality of second lapel pieces 542, and the first lapel pieces 541 and the second lapel pieces 542 are alternately arranged in the extension direction of the flexing arm 53, and each of the first lapel pieces 541 and each of the second lapel pieces 542 are respectively connected to two adjacent flexing arms 53 at intervals in the arrangement direction of the flexing arm 53. Specifically, a plurality of the first connecting pieces 541 are connected to the flexure arms 53 in rows and at intervals in the arrangement direction of the flexure arms 53, a plurality of the second connecting pieces are connected to the flexure arms 53 in rows and at intervals in the arrangement direction of the flexure arms 53, and the first connecting pieces 541 and the second connecting pieces 542 are alternately arranged in the arrangement direction of the flexure arms 53, and a plurality of rows of the first connecting pieces 541 and a plurality of rows of the second connecting pieces 542 are alternately arranged in the extension direction of the flexure arms 53, so as to avoid the connecting pieces being arranged in rows between each pair of adjacent two flexure arms 53, resulting in excessive rigidity and stress concentration, thereby reducing the risk of breakage of the connecting portion 54, and at the same time reducing the suspended length of the flexure arms 53 near the connecting portion 54, thereby increasing the rigidity of the flexure portion 5.

[0048] In some embodiments, the first connecting piece 541 and the second connecting piece 542 are arranged at the second bending portion 522 and near the second bending portion 522 to improve the stiffness of the second bending portion 522, so that the stiffness of the second bending portion 522 is greater than the stiffness of other bending portions 52, so that when the flexure 5 is deformed, the second bending portion 522 can provide a greater restoring force, so that the flexure 5 returns to its original shape, further driving the movable frame 3 to return to its original position, thereby improving the reliability of the lead frame 1.

[0049] In some embodiments, the first connecting piece 541 is arranged in a row at the second bending portion 522, the second connecting piece 542 is arranged in a row at the second section 512 and adjacent to the L of the second bending portion 522, and the second connecting piece 542 is arranged in a row at the third section 513 and adjacent to the L of the second bending portion 522. It can be understood that the first connecting piece 541 located at the second bending portion 522 is staggered with the second connecting piece 542 located at the second section 512 and the third section 513, respectively, so as to reduce the suspended length of the flexure arm 53 near the second bending portion 522, increase the rigidity of the second bending portion 522, and further increase the ability of the second bending portion 522 to maintain and restore its original shape when subjected to force, so that the mobile frame 3 is easier to maintain in place when subjected to force, or the mobile frame 3 is easier to restore to its original position when the external force is removed, thereby improving the reliability of the lead frame 1. It is worth mentioning that the first collar component can also be arranged in a row at the center line H of the second section 512 and the center line H of the third section 513, so as to increase the rigidity of the second section 512 and the third section 513 on both sides of the second bending portion 522, so as to further improve the rigidity of the second bending portion 522, so that the second bending portion 522 provides a greater restoring force to counteract the external force applied to the lead frame 1, so that the lead frame 1 can be more easily kept in place when subjected to force.

[0050] like Figure 4 As shown, in some embodiments, the δ1 is greater than the δ3, and the δ2 ​​is 0° or 180°, so that the flexibility of the second bending portion 522 is better. When the movable frame 3 drives the first section 511 to twist in a large range, the stress of the second section 512 is released through the second bending portion 522, so that the deformation of the third section 513 is smaller. The stiffness of the third bending portion 523 is greater than the stiffness of the first bending portion 521 and the second bending portion 522, so that the fourth section 514 is basically not deformed, thereby providing a more reliable reverse force effect, which is more conducive to the flexible portion 5 driving the movable frame 3 to return to its original position, and at the same time makes the connection between the fourth section 514 and the fixed frame 2 more reliable, thereby increasing the reliability of the lead frame 1.

[0051] like Figure 5As shown, in some embodiments, the δ1 is greater than the δ2, and the δ2 ​​is greater than the δ3, so that the first section 511 can be twisted in a large range, the second section 512 can be twisted in a small range, and the third section 513 and the fourth section 514 almost remain in their original state. In other words, the deformation of the third section 513 is small, and the rigidity of the third bending portion 523 is greater than the rigidity of the first bending portion 521 and the second bending portion 522, so that the deformation of the part of the flexure 5 close to the mobile frame 3 is large, and the deformation of the part close to the fixed frame 2 is small, so that the fourth section 514 and the third section 513 provide a more reliable restoring force, which is more conducive to the flexure 5 driving the mobile frame 3 to return to its original position, and at the same time, the connection between the fourth section 514 and the fixed frame 2 is more reliable, so as to increase the reliability of the lead frame 1.

[0052] like Figure 6 As shown, in some embodiments, the δ1 is equal to the δ3, and the δ3 is greater than the δ2, so that the stiffness of the second bending portion 522 is greater than the stiffness of the first bending portion 521 and the third bending portion 523, thereby reducing the deformation of the second section 512 and the third section 513 on both sides of the second bending portion 522 to provide a more reliable restoring force, which is more conducive to the flexible portion 5 driving the movable frame 3 to return to its original position.

[0053] In some embodiments, the first bending portion 521 is connected to the first section 511 and the second section 512 in an arc-shaped transition, the second bending portion 522 is connected to the second section 512 and the third section 513 in a straight line transition, and the third bending portion 523 is connected to the third section 513 and the fourth section 514 in an arc-shaped transition, so that the stiffness of the second bending portion 522 is greater than the stiffness of the first bending portion 521 and the third bending portion 523, thereby reducing the deformation of the second section 512 and the third section 513 on both sides of the second bending portion 522 to provide a more reliable restoring force, so that the lead frame 1 is easier to maintain or return to its original position when affected by external force, thereby improving the reliability of the lead frame 1. That is to say, the first bending portion 521 and the third bending portion 523 are arc-shaped, so that the extension direction of the flexure 5 changes more slowly, thereby improving the flexibility of the flexure 5 so that the flexure 5 can withstand greater deformation and reduce the resistance encountered by the movable frame 3 when it moves relative to the fixed frame 2. The second bending portion 522 is straight, so as to increase the rigidity of the flexure 5 and improve the ability of the flexure 5 to recover and maintain.

[0054] In some embodiments, the second bending portion 522 is wider than the second section 512 and the third section 513, thereby increasing the rigidity of the second bending portion 522 and reducing the flexibility of the second bending portion 522, so that the flexible portion 5 can more reliably support the connection between the movable frame 3 and the fixed frame 2. When the movable frame 3 rotates or moves relative to the fixed frame 2, the second bending portion 522 can provide a greater reaction force to return the movable frame 3 to its original position, thereby further improving the reliability of the lead frame 1.

[0055] According to the second aspect of the present application, a voice coil motor 6 comprises at least one lead frame 1, an image sensor 61 and a driving assembly 62, wherein the image sensor 61 is disposed on the movable frame 3 of the lead frame 1, and is mechanically and electrically connected to the fixed frame 2 of the lead frame 1 through the flexure 5, and the driving assembly 62 is disposed on the movable frame 3, so that the image sensor 61 moves along with the movable frame 3 relative to the fixed frame 2 in a plane direction perpendicular to the optical axis. In other words, the image sensor 61 is fixedly connected and electrically connected to the circuit board on the movable frame 3, and the circuit board on the movable frame 3 is electrically connected to the circuit board on the fixed frame 2 through the conductive layer 532 of the flexure arm 53, so that the image sensor 61 is connected to other circuits. The driving component 62 applies an external force to cause the mobile frame 3 to carry the image sensor 61 and rotate relative to the fixed frame 2. The flexible portion 5 generates a twisting deformation to support the mobile frame 3 to move relative to the fixed frame 2. When the external force of the driving component 62 is removed, the flexible portion 5 provides a restoring force to return the mobile frame 3 to its original position.

[0056] In some embodiments, the driving component 62 includes a plurality of magnets 621 and a plurality of coils 622. The coils 622 are placed on the flexible printed circuit of the moving frame 3. The magnets 621 are mounted on the fixed base of the voice coil motor 6 and are arranged opposite to the coils 622. When the coils 622 are energized, the magnetic field generated by the magnets 621 interacts with the coils 622, thereby driving the moving frame 3 to move the image sensor 61 in multiple directions orthogonal to the optical axis.

[0057] According to the third aspect of the present application, a camera module 7 includes a lens assembly 71, a focus motor 72 and at least one voice coil motor 6, wherein the lens assembly 71 is equipped with at least one lens, the focus motor 72 is placed outside the lens assembly 71, and the voice coil motor 6 is located below the lens assembly 71, so that the image sensor 61 senses light and forms an image. Specifically, the focus motor 72 is able to drive the lens assembly 71 to move along the optical axis, so that the camera module 7 has an autofocus function to produce a clear image, and the voice coil motor 6 is able to drive the image sensor 61 to move in a plane perpendicular to the optical axis, so that the camera module 7 has a rigid anti-shake function, compensating for the movement of the lens assembly 71, and further improving the image quality. Since the mass of the image sensor 61 is usually smaller than the mass of the lens assembly 71, the external force required to drive the movable frame 3 to move in a plane perpendicular to the optical axis is smaller than that by driving the lens assembly 71, thereby reducing the volume of the magnet 621 and the coil 622, further reducing the volume of the camera module 7, and further facilitating the miniaturization of the camera module 7.

[0058] The above describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention to be protected. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A lead frame, characterized in that: include: Fixed frame; A mobile frame, wherein the mobile frame is movably connected to the fixed frame; A flexure assembly, wherein the flexure assembly includes a plurality of flexure portions, wherein the flexure portions are centrally symmetrically arranged between the fixed frame and the movable frame so as to support the movable frame in the middle of the fixed frame, wherein the flexure portion is provided with a plurality of sections and a plurality of bending portions, wherein the stiffness of at least one of the bending portions is greater than the stiffness of the other bending portions, and each of the bending portions transitionally connects adjacent sections so as to change the extension direction of two adjacent sections so that the two ends of the flexure portion are respectively connected to the free side of the fixed frame and the free side of the movable frame.

2. The lead frame according to claim 1, characterized in that: Each of the flexures includes a lead-out portion and a connecting portion, a plurality of the sections and a plurality of the bending portions are alternately arranged between the lead-out portion and the connecting portion, the lead-out portion is fixedly connected to the free side of the movable frame, the connecting portion is fixedly connected to the free side of the fixed frame, and the lead-out portion and the connecting portion are arranged on opposite sides.

3. The lead frame according to claim 1, wherein: The multiple sections include a first section, a second section, a third section and a fourth section, and the multiple bending portions include a first bending portion, a second bending portion and a third bending portion, the first bending portion integrally connects the first section and the second section, the second bending portion integrally connects the second section and the third section, and the third bending portion integrally connects the third section and the fourth section, so that the first section and the fourth section are arranged on non-opposite sides between the movable frame and the fixed frame.

4. The lead frame according to claim 3, characterized in that: The first section and the third section are arranged along a first direction, the second section and the fourth section are arranged along a second direction, the first direction is arranged perpendicular to the second direction, the first bending portion transitionally connects the first section and the second section, so that the flexible section extends from the first direction to the second direction, the second bending portion transitionally connects the second section and the third section, so that the flexible section bends back from the second direction to the first direction, and the third bending portion transitionally connects the third section and the fourth section, so that the flexible section extends from the first direction to the second direction.

5. The lead frame according to claim 3, characterized in that: The flexure portion includes a plurality of flexure arms, adjacent flexure arms are separated by air gaps, the flexure arms are arranged parallel to each other in the section, an angle of the flexure arm from inside to outside in the bending direction at the first bending portion is δ1, an angle of the flexure arm from inside to outside in the bending direction at the second bending portion is δ2, an angle of the flexure arm from inside to outside in the bending direction at the third bending portion is δ3, and δ1 is greater than δ2.

6. The lead frame according to claim 5, characterized in that The flexure arm includes an insulating layer, a conductive layer, and a base layer stacked sequentially, so that the moving frame is mechanically and electrically connected to the fixed frame.

7. The lead frame according to claim 5, characterized in that: The flexure portion also includes a lapel portion, which is arranged in the air gap to mechanically connect two adjacent flexure arms. The lapel portion includes a plurality of first lapel parts and a plurality of second lapel parts. The first lapel parts and the second lapel parts are arranged alternately in the extension direction of the flexure arm, and each of the first lapel parts and each of the second lapel parts are respectively connected to two adjacent flexure arms at intervals in the arrangement direction.

8. The lead frame according to claim 7, characterized in that: The first collar pieces are arranged in a row at the second bending portion, the second collar pieces are arranged in a row at the second section and adjacent to the second bending portion, and the second collar pieces are arranged in a row at the third section and adjacent to the second bending portion.

9. The lead frame according to claim 8, characterized in that: The first collar component is disposed at a center line of the second section and a center line of the third section, respectively.

10. The lead frame according to claim 5, characterized in that The δ2 ​​is 0° or 180°, or δ2>δ3, or δ1=δ3>δ2.

11. The lead frame according to any one of claims 3 to 10, characterized in that: The first bending portion transitions in an arc shape to connect the first section and the second section, the second bending portion transitions in a straight line to connect the second section and the third section, and the third bending portion transitions in an arc shape to connect the third section and the fourth section, so that the stiffness of the second bending portion is greater than the stiffness of the first bending portion and the third bending portion.

12. A voice coil motor, characterized in that: include: The lead frame according to any one of claims 1 to 11; an image sensor, the image sensor being disposed on the movable frame of the lead frame and being mechanically and electrically connected to the fixed frame of the lead frame through the flexure; A driving component is arranged on the moving frame so that the image sensor moves along with the moving frame relative to the fixed frame in a plane direction perpendicular to the optical axis.

13. A camera module, characterized in that: include: A lens assembly, equipped with at least one lens; A focus motor, the focus motor being disposed outside the lens assembly; The voice coil motor as claimed in claim 12, wherein the voice coil motor is located below the lens assembly so that the image sensor is sensitive to light and forms an image.

Images