Lens driving module and camera module

Abstract

The invention relates to a lens driving module and a camera module. The lens driving module is used for bearing an optical lens and comprises a base; the lens carrier is movably arranged on the base; the driving assembly is configured to drive the lens carrier to move relative to the base; the correction assembly comprises correction magnets and correction magnet yokes, one of the correction magnets and the correction magnet yokes is arranged on the lens carrier, the other correction magnet yoke is oppositely arranged on the base in the first direction parallel to the optical axis of the optical lens, and each correction magnet yoke comprises a first correction magnet yoke and a second correction magnet yoke which are arranged at intervals in the width direction of the lens carrier; the length of the first correction magnet yoke is larger than that of the second correction magnet yoke, the projection area of the first correction magnet yoke on the correction magnet in the first direction is larger than that of the second correction magnet yoke on the correction magnet in the first direction, and the center line of the correction magnet penetrates through the first correction magnet yoke. The influence of deflection torque on the movement of the lens carrier is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a lens driving module and an imaging module. Background Art

[0002] With the popularization of mobile electronic devices, the related technologies of imaging modules used in mobile electronic devices to help users obtain images have developed rapidly. Currently in the market, consumers have an increasing demand for the shooting of imaging modules configured in mobile electronic devices.

[0003] At present, in order to reduce the volume and make the best use of the internal space, the imaging module usually adopts a bent circuit board. By bending the circuit board, it can use multiple bent surfaces to adapt to and attach to the lens carrier, so as to achieve circuit conduction under the premise of occupying less space. However, when the lens carrier moves to achieve functions such as anti-shake, the bent circuit board attached to the lens carrier will deform under the drive of the lens carrier. The elastic reset tendency of the bent circuit board after deformation will act on the lens carrier, resulting in the actual movement amount of the lens carrier deviating or deflecting compared with the expected movement amount, thus affecting the normal operation of the anti-shake function of the imaging module. Summary of the Invention

[0004] Based on this, in view of the problem that the current bent circuit board causes the movement of the lens carrier to deviate or deflect, it is necessary to provide a lens driving module and an imaging module that can reduce the influence of the bent circuit board on the movement of the lens carrier.

[0005] The present application first provides a lens driving module for carrying an optical lens, including: a base; a lens carrier movably disposed on the base; a driving component configured to drive the lens carrier to move relative to the base; and a correction component including a correction magnet and a correction yoke, one of which is disposed on the lens carrier and the other is disposed opposite to the base in a first direction parallel to the optical axis of the optical lens. Each correction yoke includes a first correction yoke and a second correction yoke spaced apart in the width direction of the lens carrier. The length of the first correction yoke is greater than that of the second correction yoke. The projection area of the first correction yoke on the correction magnet in the first direction is greater than the projection area of the second correction yoke on the correction magnet in the first direction, and the center line of the correction magnet passes through the first correction yoke.

[0006] In one embodiment, the lens driving module further includes at least one bent circuit board, which is bent along a direction perpendicular to the optical axis of the optical lens and at least partially adheres to the lens carrier. The bent circuit board is fixed to the base and electrically connected to the driving component, and the bent circuit board is connected to one side of the lens carrier via a corner of the lens carrier.

[0007] In one embodiment, the perpendicular line from the central axis of the lens carrier to the correction yoke falls on the first correction yoke, and the perpendicular line from the central axis of the lens carrier to the correction yoke does not pass through the second correction yoke.

[0008] In one embodiment, the lens driving module further includes at least three balls. The lens carrier and the base are provided with multiple groups of ball grooves corresponding to each of the balls and having a diameter larger than the corresponding ball. Each ball is movably clamped between a corresponding group of ball grooves to form a fulcrum on the bottom wall of the ball groove and support the movement of the lens carrier relative to the base.

[0009] In one embodiment, the lens driving module includes at least two sets of the correction components and three balls circumferentially arranged around the optical axis. The projections of the correction components and the balls along the first direction are spaced apart.

[0010] In one embodiment, the projection of the lens carrier along the first direction is rectangular, and the projections of the three balls along the first direction respectively correspond to three adjacent top corners of the projected rectangle of the lens carrier. The lens driving module includes at least two sets of the correction components, and the two sets of the correction components are symmetrically arranged with respect to the diagonal line passing through the other top corner of the projected rectangle.

[0011] In one embodiment, the lens driving module includes three sets of the correction components, and the projection of another set of the correction components along the first direction is located at the other top corner of the projected rectangle of the lens carrier that does not correspond to the balls.

[0012] In one embodiment, the driving assembly includes two anti-shake driving assemblies, and the two anti-shake driving assemblies are configured to drive the lens carrier to move relative to the base along a second direction and a third direction perpendicular to the optical axis, wherein the second direction and the third direction are perpendicular to each other; the bent circuit board includes a first circuit board segment, a first bent segment, a second circuit board segment, a second bent segment, and a third circuit board segment connected in sequence. The projections of the first circuit board segment, the second circuit board segment, and the third circuit board segment along the first direction are U-shaped, and the first circuit board segment and the third circuit board segment are respectively located on both sides of a third imaginary line passing through the optical axis parallel to the third direction, and the first bent segment and the second bent segment are located on the same side of a second imaginary line passing through the optical axis parallel to the second direction.

[0013] In one embodiment, with the second imaginary line as the boundary, the centroid of the lens carrier is located on the side where the first bent segment and the second bent segment are located.

[0014] In one embodiment, the projections of the first circuit board segment and the second circuit board segment along the first direction at least partially overlap with the correction assembly.

[0015] In one embodiment, fixing pieces are fixedly attached to the sides of the first bent segment and the second bent segment away from the axis, and the stiffness of the fixing pieces is greater than that of the corresponding bent circuit board.

[0016] In one embodiment, when the lens carrier is at the extreme position close to the first circuit board segment along the second direction and at the extreme position away from the second circuit board segment along the third direction, the bent circuit board is in an undeformed state.

[0017] In one embodiment, the projection of the first bent segment along the first direction is located between the two correction assemblies.

[0018] In one embodiment, within the movement range of the lens carrier, the bending angle of the first bent segment is always greater than 90°.

[0019] In one embodiment, the first correction yoke of each correction assembly is located closer to the first bent segment than the second correction yoke.

[0020] The second aspect of the present application provides an imaging module, including an optical lens, a photosensitive module, a housing, and the above-mentioned lens driving module; the optical lens is disposed on the lens carrier and is configured to receive light along the first direction and emit the light; the photosensitive module is disposed on the base and is configured to receive the light emitted by the optical lens for imaging; the housing covers the lens driving module.

[0021] For the above-mentioned lens driving module, by providing a correction magnet and a correction yoke with an offset in the tangential direction along the central axis of the lens carrier, the magnetic attraction force between the correction yoke and the correction magnet is bound to have a magnetic attraction component in the tangential direction along the central axis of the lens carrier. This magnetic attraction component can form a magnetic torque opposite to the direction of the deflection torque and is used to counteract the unintended rotation of the lens carrier under the action of the deflection torque, thereby reducing the influence of the deflection torque on the movement of the lens carrier. In addition, compared with symmetrically dividing each correction yoke into two segments with equal lengths, in the present application, each correction yoke is divided into two asymmetric segments with different lengths, which can obtain a stronger restoring force and a better correction effect. It should be understood that the correction yoke is tangentially separated along the central axis of the lens carrier into a first correction yoke with a longer length and a second correction yoke with a shorter length, so that the correction yoke forms an asymmetric layout around the central axis of the lens carrier. It should be understood that due to reasons such as the forming accuracy of parts and assembly, the linearity of the lens carrier during movement driven by the driving component will have a slight deviation. In the present application, the relative position change between the correction magnet and the correction yoke causes a change in the magnetic flux distribution, and the longer structure of the first correction yoke gives it a stronger magnetic flux convergence ability to increase the magnetic torque between the correction yoke and the correction magnet, thereby compensating for the deflection in principle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a perspective view of the imaging module of the present application; Figure 2 is a perspective view of one embodiment of the lens driving module of the present application; Figure 3 is Figure 2 an exploded view of; Figure 4 is Figure 2 a perspective schematic view of the bent circuit board, the lens module, the ball, and the correction yoke in the above along the top view direction; Figure 5 is Figure 3 an enlarged view of the base in the above; Figure 6 is Figure 5 a perspective view from another angle; Figure 7This is a perspective view of the bent circuit board, lens module, ball, and correction yoke in another embodiment of the lens driving module of the present application along the top view direction; Figure 8 This is a perspective view of the bent circuit board, lens module, ball, and correction yoke in another embodiment of the lens driving module of the present application along the top view direction; Figure 9 is Figure 3 an enlarged view of the bent circuit board in Figure 10 is Figure 4 a schematic diagram of three deformation corners of the bent circuit board in

[0023] Reference numerals: 100, lens driving module; 10, base; 11, first ball groove; 20, lens carrier; 20a, anti-shake carrier; 20b, focusing carrier; 21, second ball groove; 30, driving component; 31, anti-shake driving component; 311, anti-shake driving magnet; 312, anti-shake driving coil; 32, focusing driving component; 321, focusing driving magnet; 322, focusing driving coil; 40, bent circuit board; 41, fourth circuit board segment; 42, third bending segment; 43, first circuit board segment; 44, first bending segment; 45, second circuit board segment; 46, second bending segment; 47, third circuit board segment; 48, fixing piece; 50, correction component; 51, correction yoke; 511, first correction yoke; 512, second correction yoke; 60, ball; 61, first ball; 62, second ball; 63, third ball; 200, optical lens; 300, housing. Detailed Embodiments

[0024] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed embodiments of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0025] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0027] In the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0029] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0030] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present application first provides a lens driving module for carrying an optical lens 200, including: a base 10; a lens carrier 20 movably disposed on the base 10; a driving component 30 configured to drive the lens carrier 20 to move relative to the base 10; and a correction component 50 including a correction magnet and a correction yoke 51, one of which is disposed on the lens carrier 20 and the other is disposed on the base 10 relatively in a first direction parallel to the optical axis of the optical lens 200. Each correction yoke 51 includes a first correction yoke 511 and a second correction yoke 512 spaced along the width direction of the lens carrier 20. The length of the first correction yoke 511 is greater than that of the second correction yoke 512. The projection area of the first correction yoke 511 on the correction magnet in the first direction is greater than the projection area of the second correction yoke 512 on the correction magnet in the first direction, and the center line of the correction magnet passes through the first correction yoke 511.

[0031] In the present application, by providing a correction magnet and a correction yoke 51 with an offset in the tangential direction along the central axis of the lens carrier 20 (refer to Figure 4 , that is, the direction parallel to the side length of the lens carrier 20), so that there must be a magnetic attraction component force in the tangential direction along the central axis of the lens carrier 20 between the correction yoke 51 and the correction magnet. This magnetic attraction component force can form a magnetic moment opposite to the direction of the deflection moment and is used to offset the unexpected rotation of the lens carrier 20 under the action of the deflection moment, thereby reducing the influence of the deflection moment on the movement of the lens carrier 20. The above-mentioned deflection moment includes but is not limited to the reset moment generated after the deformation of the bent circuit board 40, and the slight offset during the movement of the lens carrier 20 due to reasons such as part forming accuracy and assembly.

[0032] Furthermore, there is also a magnetic attraction and repulsion force in the first direction between the correction yoke 51 and the correction magnet. This magnetic attraction and repulsion force can improve the attachment reliability between the base 10 and the lens carrier 20 and reduce the risk of detachment between the two. On this basis, each correction yoke 51 is divided into a first correction yoke 511 and a second correction yoke 512 that are spaced apart. Compared with setting a single-section correction yoke 51, in order to ensure that the center of the single-section correction yoke 51 is offset from the center of the correction magnet, it is inevitable that it cannot be completely aligned with the correction magnet, resulting in a relatively small overlapping area and relatively weak magnetic attraction force between the two. However, this problem does not exist in the two-section correction yoke 51. That is to say, in this application, by dividing each correction yoke 51 into a first correction yoke 511 and a second correction yoke 512 that are spaced apart, the magnetic attraction stability between the base 10 and the lens carrier 20 can be improved.

[0033] Furthermore, compared with symmetrically dividing each correction yoke 51 into two sections of equal length, in this application, each correction yoke 51 is divided into two asymmetric sections with different lengths, which can obtain a stronger restoring force and a better correction effect. It should be understood that the correction yoke 51 is divided along the tangential direction of the central axis of the lens carrier 20 into a first correction yoke 511 with a longer length and a second correction yoke 512 with a shorter length, so that the correction yoke 51 forms an asymmetric layout around the central axis of the lens carrier 20. It should be understood that due to reasons such as the forming accuracy and assembly of parts, the linearity of the lens carrier 20 will have a slight deviation when moving under the drive of the drive assembly 30. In this application, the relative position change between the correction magnet and the correction yoke 51 causes a change in the magnetic flux distribution, and the longer structure of the first correction yoke 511 gives it a stronger magnetic flux convergence ability to increase the magnetic moment (i.e., the correction moment) between the correction yoke 51 and the correction magnet, thereby compensating for deflection in principle.

[0034] In some embodiments, the optical lens 200 is placed at the center position of the lens carrier 20. At this time, the optical axis O of the optical lens 200 is the central axis of the lens carrier 20. In some other embodiments, the optical lens 200 can also be offset and arranged on the lens carrier 20 to meet the miniaturization requirements of the lens drive module. At this time, the optical axis O is parallel to but does not coincide with the central axis of the lens carrier 20.

[0035] It should be noted that the width direction of the above-mentioned lens carrier 20 refers to the side length direction of each side of the lens carrier 20. Taking the lens carrier 20 with a rectangular cross-section as an example, the length directions of the first correction yoke 511 and the second correction yoke 512 are parallel to the side length direction of one side of the lens carrier 20, and the first correction yoke 511 and the second correction yoke 512 are spaced apart along the side length direction of this side of the lens carrier 20; In addition, the above-mentioned lens carrier 20 includes an anti-shake carrier 20a and a focusing carrier 20b. One of the anti-shake carrier 20a and the focusing carrier 20b is used to carry the optical lens 200, and the one carrying the optical lens 200 is movably arranged on the other, and the other is movably arranged on the base 10. For example, the focusing carrier 20b carries the optical lens 200 and is movably arranged in the anti-shake carrier 20a along the first direction, and the anti-shake carrier 20a is movably arranged on the base 10 along the second and third directions; or the anti-shake carrier 20a carries the optical lens 200 and is movably arranged in the focusing carrier 20b along the second and third directions, and the focusing carrier 20b is movably arranged on the base 10 along the first direction.

[0036] Please refer to Figure 2 , Figure 3 and Figure 4 As shown, the lens driving module 100 further includes at least one bent circuit board 40. The bent circuit board 40 is bent along a direction perpendicular to the optical axis of the optical lens 200 and at least partially adheres to the lens carrier 20. The bent circuit board 40 is fixed to the base 10 and electrically connected to the driving component 30. The bent circuit board 40 is connected to one side surface of the lens carrier 20 via a corner of the lens carrier 20.

[0037] Since the bent circuit board 40 is connected to one side surface of the lens carrier 20 via a corner of the lens carrier 20, when the lens carrier 20 moves under the drive of the driving component 30, the bent circuit board 40 will deform under the drive of the lens carrier 20. The deformed bent circuit board 40 has a force application tendency in the direction opposite to the deformation direction. For the convenience of description, the reverse force application tendency of the bent circuit board 40 in this application is defined as a restoring moment; under the action of the restoring moment, the lens carrier 20 is prone to large deflection, thus affecting the normal operation of the anti-shake function.

[0038] In this application, the magnetic attraction force between the correction components 50 forms a magnetic moment opposite to the direction of the restoring moment, and is used to offset the unexpected rotation of the lens carrier 20 under the action of the restoring moment, thereby reducing the influence of the restoring moment of the bent circuit board 40 on the movement of the lens carrier 20.

[0039] Please refer to Figure 4As shown, both the first correction yoke 511 and the second correction yoke 512 are straight strips. The perpendicular line from the central axis of the lens carrier 20 to the correction yoke 51 lands on the first correction yoke 511, and the perpendicular line from the central axis of the lens carrier 20 to the correction yoke 51 does not pass through the second correction yoke 512. The lens carrier 20 rotates around its own central axis, and the landing point of the perpendicular line from the central axis of the lens carrier 20 to the correction yoke 51 is located on the first correction yoke 511 (i.e., the perpendicular line of the central axis of the lens carrier 20 points to the first correction yoke 511), so that the center of the first correction yoke 511 is closer to the perpendicular line of the central axis of the lens carrier 20. According to the lever principle, the magnetic resistance arm generated at the first correction yoke 511 is longer, and under the action of the same magnetic force, the correction torque can be amplified to obtain better correction ability.

[0040] In some other embodiments, the first correction yoke 511 and the second correction yoke 512 can also be arc-shaped, as long as it is ensured that in the movable trajectory of the lens carrier 20, the correction magnet can receive asymmetric magnetic suction forces from the first correction yoke 511 and the second correction yoke 512, the magnetic suction force of the first correction yoke 511 is greater than that of the second correction yoke 512, and the direction of the magnetic suction force of the first correction yoke 511 and the direction of the reset torque of the bent circuit board 40 are in different directions. Please refer to Figure 3 、 Figure 5 and Figure 6 As shown, in some embodiments, the driving assembly 30 includes two groups of anti-shake driving assemblies 31. Each group of anti-shake driving assemblies 31 includes an anti-shake driving magnet 311 and an anti-shake driving coil 312 facing each other in the first direction. One of the anti-shake driving magnet 311 and the anti-shake driving coil 312 is arranged on the lens carrier 20, and the other is arranged on the base 10; one group of anti-shake driving assemblies 31 is used to drive the lens carrier 20 to move relative to the base 10 in the second direction, and the other group of anti-shake driving assemblies 31 is used to drive the lens carrier 20 to move relative to the base 10 in the third direction.

[0041] Furthermore, in some embodiments, the anti-shake driving magnet 311 is a correction magnet, so that while the anti-shake driving magnet 311 cooperates with the anti-shake driving coil 312 to drive the lens carrier 20, it can also cooperate with the correction yoke 51 to achieve the magnetic suction correction function, reducing the number of internal parts of the lens driving module and improving the overall structural integration.

[0042] Of course, in some other embodiments, the anti-shake driving magnet 311 and the correction magnet can also be two independent parts.

[0043] Please refer to Figure 5 and Figure 6As shown, in some embodiments, the lens driving module 100 further includes at least three balls 60. The lens carrier 20 and the base 10 are provided with multiple sets of ball grooves that correspond to each ball 60 one by one and have a diameter larger than the corresponding ball 60. Each ball 60 is movably clamped between a corresponding set of ball grooves to form a fulcrum on the bottom wall of the ball groove and support the movement of the lens carrier 20 relative to the base 10.

[0044] It is worth mentioning that since the diameter of the ball groove is larger than that of the ball 60, the ball 60 can freely roll in the ball groove while supporting the lens carrier 20, and the lens carrier 20 can move in multiple degrees of freedom relative to the base 10. It should be understood that the lens carrier 20 is not limited in the second and third directions, and the restoring moment of the bent circuit board 40 on the lens carrier 20 will be more obvious. That is to say, the lens carrier 20 is more likely to deflect under the influence of the bent circuit board 40. In this application, through the cooperation of the above-mentioned correction yoke 51 and the correction magnet, the influence of the bent circuit board 40 on the movement of the lens carrier 20 can be effectively reduced.

[0045] Specifically, the base 10 is provided with a plurality of first ball grooves 11 corresponding to each ball 60, and the lens carrier 20 is provided with a plurality of second ball grooves 21 corresponding to each ball 60. Each ball 60 is movably clamped between the corresponding first ball groove 11 and the second ball groove 21.

[0046] More specifically, in some embodiments, a gasket is embedded in the bottom wall of the first ball groove 11 and / or the second ball groove 21. The gasket is made of metal or other materials with higher strength to increase the structural strength of the bottom of the first ball groove 11 and / or the second ball groove 21, and avoid the deformation of the bottom of the groove caused by excessive pressure of the ball 60 during the use of the lens driving module. Preferably, the materials of the base 10 and the lens carrier 20 are plastic, the material of the gasket is metal, and the gasket is integrally formed with the base 10 or the lens carrier 20 through an insert molding process.

[0047] Please refer to Figure 4 、 Figure 5 and Figure 6 As shown, in some embodiments, the lens driving module 100 includes at least two sets of correction components 50 and three balls 60 circumferentially arranged around the optical axis O. The projection intervals of the correction components 50 and the balls 60 in the first direction are distributed, that is, the correction components 50 are arranged inside the balls 60 to ensure that the deflection magnetic moment can act on the rotation plane formed by the balls 60, or to ensure that the deflection magnetic moment can act on the rotation axis formed by two balls 60.

[0048] Specifically, the three balls 60 are the first ball 61, the second ball 62, and the third ball 63. One set of correction components 50 is located between the second ball 62 and the third ball 63, and the other set of correction components 50 is located between the first ball 61 and the second ball 62, so as to ensure that the deflection magnetic torque of one set of correction components 50 can act on the center line connecting the second ball 62 and the third ball 63, and the deflection magnetic torque of the other set of correction components 50 can act on the center line connecting the first ball 61 and the second ball 62.

[0049] It should be understood that the three-point support structure formed by the three balls 60 can stably support the lens carrier 20 while occupying relatively little space, balancing the motion freedom required for the anti-shake function and the structural stability requirement within a limited space, which is beneficial to the miniaturization of the overall structure of the lens drive module; and setting the correction components 50 between the balls 60 can further improve the correction effect of the correction components 50.

[0050] Please refer to Figure 4 As shown, in some embodiments, the projection of the lens carrier 20 along the first direction is rectangular, and the projections of the three balls 60 along the first direction respectively correspond to three adjacent vertices of the projected rectangle of the lens carrier 20; the lens drive module 100 includes at least two sets of correction components 50, and the two sets of correction components 50 are symmetrically arranged with the diagonal line passing through another vertex of the projected rectangle as the center.

[0051] Specifically, the second ball 62 and the third ball 63 are arranged parallel to the second direction, and the first ball 61 and the third ball 63 are arranged parallel to the third direction. One set of correction components 50 is located between the second ball 62 and the third ball 63 along the second direction, and the other set of correction components 50 is located between the first ball 61 and the second ball 62 along the third direction. The two sets of correction components 50 are symmetrically arranged with the diagonal line passing through the second ball 62 as the center.

[0052] It should be understood that the magnetic torque of the correction component 50 has a direction. By symmetrically arranging the two sets of correction components 50 with the diagonal line passing through another vertex of the projected rectangle as the center, that is, the first correction yokes 511 of the two sets of correction components 50 are both located on the side close to the second ball 62, or the second correction yokes 512 of the two sets of correction components 50 are both located on the side close to the second ball 62, so that the magnetic torque directions of the two sets of correction components 50 are opposite, and the correction directions of the two sets of correction components 50 can be complementary, so as to allow a certain degree of correction compensation without deflection due to magnetic torque.

[0053] Of course, please refer to Figure 7As shown, in some other embodiments, if the reset torque of the bent circuit board 40 or other torques causing the deflection of the lens carrier 20 are too large, the two sets of correction components 50 can also be arranged in the same rotation direction, that is, the first correction yoke 511 in the two sets of correction components 50 is located on the same rotation direction side (clockwise side or counterclockwise) of the second correction yoke 512. At this time, the magnetic torque directions of the two sets of correction components 50 are the same, and the correction forces of the two sets of correction components 50 are relatively large, which can resist the situation of larger deflection torques, but may cause deflection due to excessive magnetic torque.

[0054] Please refer to Figure 4 As shown, in some embodiments, for the moving body formed by the lens carrier 20 and the optical lens 200, its center of mass is located on the side close to the correction component 50 relative to the second imaginary line or the third imaginary line. Since the lens carrier 20 is supported by three freely movable balls 60, the three support points of the lens carrier 20 do not have a clear rotation center axis that limits rotational movement. It should be understood that the magnetic torque of the correction component 50 on the lens carrier 20 can be regarded as the acting force on the center of mass of the moving body. Therefore, setting the center of mass of the moving body on the side close to the correction component 50 can reduce the magnetic torque, thereby reducing the deflection influence of the correction component 50 itself on the moving body. Among them, the second imaginary line is a virtual line parallel to the connection line between the second ball 62 and the third ball 63 and passing through the central axis of the lens carrier 20, and the third imaginary line is a virtual line parallel to the connection line between the first ball 61 and the second ball 62 and passing through the central axis of the lens carrier 20.

[0055] Please refer to Figure 8 As shown, in some embodiments, the lens driving module 100 includes three sets of correction components 50, and the projection of the other set of correction components 50 in the first direction is located at the other vertex angle of the projection rectangle of the lens carrier 20 that does not correspond to the ball 60; to further strengthen or weaken the influence of the reset torque of the bent circuit board 40, so as to better control the unexpected rotation of the lens driving module of the present application.

[0056] Further, the third circuit board segment 47 of the bent circuit board 40 is attached to the lens carrier 20, and at least part of the projection of the third set of correction components 50 in the first direction coincides with the third circuit board segment 47. It is not difficult to understand that since the attachment position of the third circuit board segment 47 and the lens carrier 20 is the deflection force receiving point of the lens carrier 20, therefore, arranging a set of correction components 50 at this position can better suppress the reset torque of the bent circuit board 40, and the correction effect is more significant.

[0057] Of course, in some other embodiments, if space permits, the third set of correction components 50 can also be arranged at other positions, such as being arranged directly opposite to the third circuit board segment 47 in the first direction, etc., as long as it is ensured that at least part of the projection of the correction component in the first direction coincides with the third circuit board segment 47.

[0058] Please refer to Figure 6 , Figure 9 and Figure 10 As shown, in some embodiments, two sets of anti-shake driving components 31 are configured to drive the lens carrier 20 to move relative to the base 10 in a second direction and a third direction perpendicular to the optical axis O, wherein the second direction and the third direction are perpendicular to each other; the bent circuit board 40 includes a fourth circuit board segment 41, a third bent segment 42, a first circuit board segment 43, a first bent segment 44, a second circuit board segment 45, a second bent segment 46, and a third circuit board segment 47 connected in sequence. The fourth circuit board segment 41 is fixed to the base 10 and extends in a first direction. The projections of the first circuit board segment 43, the second circuit board segment 45, and the third circuit board segment 47 in the first direction are U-shaped, and the first circuit board segment 43 and the third circuit board segment 47 are respectively located on both sides of a third imaginary line passing through the optical axis O parallel to the third direction. The first bent segment 44 and the second bent segment 46 are located on the same side of a second imaginary line passing through the optical axis O parallel to the second direction.

[0059] Specifically, the third bent segment 42, the first bent segment 44, and the second bent segment 46 are formed by hot pressing and bending the circuit board. Their stiffness is greater than that of other circuit board segments, which can maintain the overall bent shape of the bent circuit board 40 and is also the main source of the reset moment of the bent circuit board 40; the first circuit board segment 43, the second circuit board segment 45, and the third circuit board segment 47 are flexible circuit boards that can adapt to the deformation of the lens carrier 20 in multiple degrees of freedom directions.

[0060] More specifically, the lens carrier 20 includes an anti-shake carrier 20a and a focusing carrier 20b. The focusing carrier 20b is slidably disposed in the anti-shake carrier 20a along the first direction and is used to carry the optical lens 200. The driving component 30 further includes a focusing driving component 32. The focusing driving coil 322 includes a focusing driving coil 322 and a relatively disposed focusing driving magnet 321. The focusing driving magnet 321 is embedded in the focusing carrier 20b. The focusing driving coil 322 is electrically connected to the third circuit board segment 47 and is used to drive the focusing carrier 20b to move along the first direction; one end of the fourth circuit board segment 41 is electrically connected to the welding point of the imaging circuit board in the base 10, so as to realize single-path conduction from the base 10 to the focusing carrier 20b through the bent circuit board 40. For the sake of simplicity of description, please refer to Figure 10 , and define the included angle of the third bent segment 42 as the first deformation angle A, the included angle of the first bent segment 44 as the second deformation angle B, and the included angle of the second bent segment 46 as the third deformation angle C.

[0061] Further, the elastic coefficient of the first deformation angle A along the second direction is greater than that along the third direction to provide a deformation stroke along the second direction; the elastic coefficient of the second deformation angle B along the second direction is less than that along the third direction to provide a deformation stroke along the third direction; the elastic coefficient of the third deformation angle C along the second direction is greater than those of the first deformation angle A and the second deformation angle B along the second direction, and the elastic coefficient of the third deformation angle C along the third direction is greater than those of the first deformation angle A and the second deformation angle B along the third direction.

[0062] Furthermore, please refer to Figure 10 As shown, when the lens carrier 20 starts to move along the positive direction of the second direction shown in the figure, the first deformation angle A decreases and the second deformation angle B increases; when the lens carrier 20 starts to move along the positive direction of the third direction shown in the figure, both the first deformation angle A and the second deformation angle B increase.

[0063] Please refer to Figure 10 As shown, in some embodiments, with the second imaginary line as the boundary, the centroid of the lens carrier 20 is located on the side where the first bent section 44 and the second bent section 46 are located. As described above, since the lens carrier 20 is supported by three freely movable balls 60, the three support points of the lens carrier 20 do not have a clear rotation center axis that limits rotational movement. Therefore, the restoring moment of the bent circuit board 40 on the lens carrier 20 can be regarded as a force acting on the centroid of the lens carrier 20. Therefore, setting the centroid of the lens carrier 20 relative to the second imaginary line on the side where the first bent section 44 and the second bent section 46 are located can effectively reduce the restoring moment, thereby reducing the deflection effect caused by the bent circuit board 40 on the lens carrier 20.

[0064] Preferably, for the moving body formed by the lens carrier 20 and the optical lens 200, its centroid is located on the side where the first bent section 44 and the second bent section 46 are located relative to the second imaginary line to reduce the deflection effect caused by the bent circuit board 40 on the moving body.

[0065] Please refer to Figure 4 and Figure 10 As shown, in some embodiments, the projections of the first circuit board section 43 and the second circuit board section 45 along the first direction at least partially overlap with the correction component 50. On the one hand, the partial overlap of the circuit board section and the correction component 50 in the first direction can make full use of the vertical space, reduce the overall thickness, and meet the compactness requirements of the lens driving module. On the other hand, when the circuit board section generates a restoring moment due to deformation, the magnetic moment used for correction by the correction component 50 directly acts on the area near the deformation source of the circuit board section, thereby reducing the deflection of the lens carrier 20 caused by the bent circuit board 40.

[0066] Further, please refer toFigure 4 and Figure 10 As shown, in some embodiments, the projection of the first bent section 44 in the first direction is located between two sets of correction components 50. It should be understood that since the angle of the first deformation angle A is relatively large and the elastic coefficient of the third deformation angle C is greater than that of the first deformation angle A and the second deformation angle B, the second deformation angle B, that is, the first bent section 44, is the main source of the elastic deformation of the bent circuit board 40 and the generation of the restoring moment. On this basis, by arranging the first bent section 44 between two sets of correction components 50, the magnetic moments generated by the two sets of correction components 50 can better compensate the restoring moment generated by the first bent section 44, thereby reducing the deflection influence of the bent circuit board 40.

[0067] Furthermore, please refer to Figure 4 and Figure 10 As shown, in some embodiments, the first correction yoke 511 of each set of correction components 50 is located closer to the first bent section 44 than the second correction yoke 512 to obtain a better correction effect.

[0068] Please refer to Figure 10 As shown, in some embodiments, fixing pieces 48 are fixedly attached to the sides of the first bent section 44 and the second bent section 46 away from the axis, and the rigidity of the fixing pieces 48 is greater than that of the corresponding bent circuit board 40. It should be understood that although the first bent section 44 and the second bent section 46 after hot pressing have an initial rigidity, they may still shift under long-term dynamic loads. The fixing pieces 48 can further strengthen the rigidity of the first bent section 44 and the second bent section 46 by externally supporting and solidifying the bent angles, so that the first bent section 44 and the second bent section 46 can maintain the preset bent shape.

[0069] In addition, in an ideal state, each bent section is absolutely rigid and each circuit board section is absolutely flexible, so that only the flexible circuit board sections deform when the lens carrier 20 moves, and at this time, the bent circuit board 40 does not generate a restoring moment. In this application, after the rigidity of the first bent section 44 and the second bent section 46 is increased by arranging the fixing pieces 48, the deformable area of the bent circuit board 40 can be limited to the flexible circuit part (i.e., each circuit board section) as much as possible, ensuring that only the predetermined flexible area is allowed to undergo controllable deformation when the lens carrier 20 moves, thereby reducing the restoring moment generated by the unexpected rigidity of the bent circuit board 40 on the lens carrier 20 and improving the displacement response accuracy of the lens drive module in this application during optical image stabilization.

[0070] Please refer to Figure 10As shown, in some embodiments, when the lens carrier 20 is at the extreme position close to the first circuit board segment 43 in the second direction and at the extreme position far from the second circuit board segment 45 in the third direction, the bent circuit board 40 is in an undeformed state. Since the second deformation angle B is the main source of the elastic deformation of the bent circuit board 40 and the generation of the restoring moment, therefore, referring to Figure 10 , by installing the bent circuit board 40 when the lens carrier 20 is at the extreme position in the negative direction of the second direction and at the extreme position in the negative direction of the third direction, since the bent circuit board 40 is in an undeformed state at this time, no matter how the lens carrier 20 moves subsequently, the deformation direction of the bent circuit board 40 is always counterclockwise around the optical axis O. That is to say, the deformation and the restoring moment of the bent circuit board 40 have a single direction, so as to facilitate the correction component 50 to compensate for the restoring moment.

[0071] Please refer to Figure 10 As shown, in some embodiments, within the movement range of the lens carrier 20, the bending angle of the first bent segment 44 is always greater than 90°. This structure with a relatively large opening angle can achieve deformation in multiple degrees of freedom, ensuring the deformable directions of the bent circuit board 40. In combination with the structure and elastic coefficient design of the first deformation angle A and the third deformation angle C, it can make the restoring moment of the bent circuit board 40 relatively controllable after deformation. Preferably, the bending angle of the first bent segment 44 is 100° - 130° to adapt to the relatively large movement stroke of the lens carrier 20.

[0072] Please combine Figure 1 and Figure 2 As shown, a second aspect of the present application provides an imaging module, including an optical lens 200, a photosensitive module, a housing 300, and the above-mentioned lens driving module 100; the optical lens 200 is arranged on the lens carrier 20 and is used to receive light and emit it in the first direction; the photosensitive module is arranged on the base 10 and is used to receive the light emitted by the optical lens 200 for imaging; the housing 300 covers the lens driving module 100.

[0073] Among them, the optical lens 200 is held on the light-sensitive path of the photosensitive module. The optical lens 200 includes a lens barrel and at least one optical lens installed in the lens barrel. The optical lens has an optical axis O parallel to the first direction (refer to Figure 1 ), and the optical axis of the optical lens is also the optical axis of at least one optical lens installed in the lens barrel. At least one optical lens is arranged in the lens barrel along the optical axis, and the photosensitive module is arranged opposite to the optical lens 200 along the optical axis direction.

[0074] The photosensitive module includes a photosensitive chip and an imaging circuit board. The photosensitive chip is used to receive the light reflected by the object collected by the optical lens 200 for imaging, and is electrically connected to other electronic devices through the imaging circuit board. The electronic component can be one or more of passive electronic devices such as resistors and capacitors, or can be one or more of active electronic devices such as driver chips and memory chips.

[0075] The imaging circuit board has a hole in the middle, and the photosensitive chip can be installed on the imaging circuit board in a sunken manner. Further, the photosensitive chip is installed on the imaging circuit board by flip-chip, and the photosensitive area of the photosensitive chip can be exposed through the opening area of the imaging circuit board; the base 10 is formed on the imaging circuit board, and the middle of the base 10 has a hole to expose the photosensitive chip.

[0076] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0077] The above-described embodiments only express several implementation manners of the present invention, and the description is relatively specific and detailed, but it cannot be understood as a limitation to the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A lens driving module, used for carrying an optical lens (200), characterized in that: include: Base (10); A lens carrier (20) movably disposed on the base (10); A driving assembly (30) configured to drive the lens carrier (20) to move relative to the base (10); as well as A correction component (50) comprises a correction magnet and a correction yoke (51), one of which is arranged on the lens carrier (20), and the other is arranged relative to the base (10) along a first direction parallel to the optical axis of the optical lens (200), each of the correction yokes (51) comprises a first correction yoke (511) and a second correction yoke (512) arranged at intervals along the width direction of the lens carrier (20), the length of the first correction yoke (511) is greater than that of the second correction yoke (512), the projection area of ​​the first correction yoke (511) on the correction magnet along the first direction is greater than the projection area of ​​the second correction yoke (512) on the correction magnet along the first direction, and the center line of the correction magnet passes through the first correction yoke (511).

2. The lens driving module according to claim 1, characterized in that: A perpendicular line from the central axis of the lens carrier (20) to the correction yoke (51) falls on the first correction yoke (511), and a perpendicular line from the central axis of the lens carrier (20) to the correction yoke (51) does not pass through the second correction yoke (512).

3. The lens driving module according to claim 2, characterized in that: The lens driving module (100) further comprises at least one bent circuit board (40), the bent circuit board (40) being bent in a direction perpendicular to the optical axis of the optical lens (200) and at least partially affixed to the lens carrier (20), the bent circuit board (40) being fixed to the base (10) and electrically connected to the driving assembly (30), and the bent circuit board (40) being connected to a side surface of the lens carrier (20) via a corner of the lens carrier (20).

4. The lens driving module according to claim 3, characterized in that: The lens driving module (100) further comprises at least three balls (60), the lens carrier (20) and the base (10) are provided with a plurality of groups of ball grooves corresponding to each of the balls (60) and having a diameter larger than that of the corresponding balls (60), and each of the balls (60) is movably clamped between a corresponding group of the ball grooves to form a fulcrum on the bottom wall of the ball groove and support the lens carrier (20) to move relative to the base (10).

5. The lens driving module according to claim 4, characterized in that: The lens driving module (100) comprises at least two groups of the correction components (50) and three rolling balls (60) arranged circumferentially around the optical axis, and the correction components (50) and the rolling balls (60) are distributed at intervals along the projection of the first direction.

6. The lens driving module according to claim 5, characterized in that: The projection of the lens carrier (20) along the first direction is rectangular, and the projections of the three rolling balls (60) along the first direction respectively correspond to three adjacent vertices of the projection rectangle of the lens carrier (20); the lens driving module (100) comprises at least two groups of the correction components (50), and the two groups of the correction components (50) are symmetrically arranged with a diagonal line passing through another vertices of the projection rectangle as the center.

7. The lens driving module according to claim 6, characterized in that: The lens driving module (100) comprises three groups of the correction components (50), and the projection of another group of the correction components (50) along the first direction is located at another vertex of the projection rectangle of the lens carrier (20) that does not correspond to the rolling ball (60).

8. The lens driving module according to claim 6, characterized in that: The driving assembly (30) comprises two groups of anti-shake driving assemblies (31), and the two groups of anti-shake driving assemblies (31) are configured to drive the lens carrier (20) to move relative to the base (10) along a second direction and a third direction perpendicular to the optical axis, wherein the second direction and the third direction are perpendicular to each other; The bent circuit board (40) comprises a first circuit board section (43), a first bending section (44), a second circuit board section (45), a second bending section (46) and a third circuit board section (47) which are connected in sequence; the projections of the first circuit board section (43), the second circuit board section (45) and the third circuit board section (47) along the first direction are U-shaped; the first circuit board section (43) and the third circuit board section (47) are respectively located on both sides of a third imaginary line passing through the optical axis along the third direction parallel to the third direction; and the first bending section (44) and the second bending section (46) are located on the same side of a second imaginary line passing through the optical axis along the second direction parallel to the second direction.

9. The lens driving module according to claim 8, characterized in that: Taking the second imaginary line as a boundary, the center of mass of the lens carrier (20) is located on the side where the first bending section (44) and the second bending section (46) are located.

10. The lens driving module according to claim 8, characterized in that: The projections of the first circuit board section (43) and the second circuit board section (45) along the first direction at least partially overlap with the correction component (50).

11. The lens driving module according to claim 8, characterized in that: A fixing sheet (48) is attached and fixed to the first bending section (44) and the second bending section (46) on a side away from the optical axis, and the rigidity of the fixing sheet (48) is greater than that of the corresponding bending circuit board (40).

12. The lens driving module according to claim 8, characterized in that: When the lens carrier (20) is located at an extreme position close to the first circuit board section (43) along the second direction and at an extreme position away from the second circuit board section (45) along the third direction, the bent circuit board (40) is in an undeformed state.

13. The lens driving module according to claim 8, characterized in that: The projection of the first bending section (44) along the first direction is located between the two groups of correction components (50).

14. The lens driving module according to claim 13, characterized in that: Within the movement range of the lens carrier (20), the bending angle of the first bending section (44) is always greater than 90°.

15. The lens driving module according to claim 13, characterized in that: The first correcting magnetic yoke (511) of each set of the correcting components (50) is located closer to the first bending section (44) than the second correcting magnetic yoke (512).

16. A camera module, characterized in that: It comprises an optical lens (200), a photosensitive module, a housing (300), and a lens driving module (100) as claimed in any one of claims 1 to 15; The optical lens (200) is arranged on the lens carrier (20) and is used to receive and emit light along the first direction; The photosensitive module is arranged on the base (10) and is used to receive the light emitted by the optical lens (200) for imaging; The housing (300) is disposed on the lens driving module (100).

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