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 application relates to the technical field of optical lens, in particular to a lens driving module and a camera module. BACKGROUND

[0002] With the popularity of mobile electronic devices, the related technology of camera modules applied to mobile electronic devices to help users obtain images has developed rapidly and made great progress. At present, consumers have increasingly high demands for the shooting of camera modules configured in mobile electronic devices.

[0003] In order to reduce the volume and make full use of the internal space, the current camera module usually adopts a bent circuit board. The bent circuit board is bent to adapt and attach to the lens carrier by using multiple bending surfaces, so as to realize circuit conduction under the premise of occupying small space.

[0004] However, when the lens carrier moves to realize functions such as anti-shake, the bent circuit board attached to the lens carrier will deform under the driving of the lens carrier. The elastic reset tendency of the bent circuit board after deformation will act on the lens carrier, so that the actual movement amount of the lens carrier deviates or deflects compared with the expected movement amount, thereby affecting the normal operation of the anti-shake function of the camera module. SUMMARY

[0005] Therefore, it is necessary to provide a lens driving module and a camera module capable of reducing the influence of the bent circuit board on the movement of the lens carrier to solve the problem that the bent circuit board causes the movement of the lens carrier to deviate or deflect.

[0006] The present application provides a lens driving module for carrying an optical lens, comprising a base, a lens carrier movably arranged on the base, a driving assembly configured to drive the lens carrier to move relative to the base, and a correction assembly comprising a correction magnet and a correction yoke, one of which is arranged on the lens carrier and the other of which is arranged on the base relative to the base along a first direction parallel to the optical axis of the optical lens. Each of the correction yokes comprises a first correction yoke and a second correction yoke arranged at intervals along 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 along the first direction is greater than that of the second correction yoke on the correction magnet along the first direction. The center line of the correction magnet passes through the first correction yoke.

[0007] In one of the embodiments, the lens driving module further comprises at least one bent circuit board, the bent circuit board is bent along a direction perpendicular to the optical lens optical axis and at least partially attached to the lens carrier, the bent circuit board is fixed to the base and electrically connected to the driving assembly, and the bent circuit board is connected to one side of the lens carrier via a corner of the lens carrier.

[0008] In one of the embodiments, the perpendicular line from the central axis of the lens carrier to the correction magnetic yoke falls on the first correction magnetic yoke, and the perpendicular line from the central axis of the lens carrier to the correction magnetic yoke does not pass through the second correction magnetic yoke.

[0009] In one of the embodiments, the lens driving module further comprises at least three balls, the lens carrier and the base are provided with a plurality of groups of ball grooves corresponding to the balls one by one and having a diameter greater than that of the balls, each ball is movably clamped between a corresponding group of ball grooves to form a fulcrum at the bottom wall of the ball grooves and support the movement of the lens carrier relative to the base.

[0010] In one of the embodiments, the lens driving module comprises at least two groups of correction assemblies and three balls arranged circumferentially around the optical axis, and the projections of each correction assembly and each ball along the first direction are distributed at intervals.

[0011] In one of the embodiments, the projection of the lens carrier along the first direction is a rectangle, the projections of the three balls along the first direction correspond to three adjacent corners of the projection rectangle of the lens carrier respectively, the lens driving module comprises at least two groups of correction assemblies, and the two groups of correction assemblies are symmetrically arranged with respect to the diagonal line passing through the other corner of the projection rectangle.

[0012] In one of the embodiments, the lens driving module comprises three groups of correction assemblies, and the projection of the other group of correction assemblies along the first direction is located at the other corner of the projection rectangle of the lens carrier which does not correspond to the ball.

[0013] In one of the embodiments, the driving assembly includes two sets of anti-shake driving assemblies 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 in a U shape, and the first circuit board segment and the third circuit board segment are located on two sides of a third imaginary line parallel to the third direction and passing through the optical axis, respectively, and the first bent segment and the second bent segment are located on the same side of a second imaginary line parallel to the second direction and passing through the optical axis.

[0014] In one of the embodiments, the center of mass of the lens carrier is located on the side where the first bent segment and the second bent segment are located with the second imaginary line as a boundary.

[0015] In one of the embodiments, the projections of the first circuit board segment and the second circuit board segment along the first direction at least partially coincide with the correction assembly.

[0016] In one of the embodiments, the first bent segment and the second bent segment are fixedly attached to a fixing sheet away from the shaft side, and the rigidity of the fixing sheet is greater than that of the corresponding bent circuit board.

[0017] In one of the embodiments, when the lens carrier is located at the limit position close to the first circuit board segment along the second direction and at the limit position away from the second circuit board segment along the third direction, the bent circuit board is in an undeformed state.

[0018] In one of the embodiments, the projection of the first bent segment along the first direction is located between the two sets of correction assemblies.

[0019] In one of the embodiments, the bending angle of the first bent segment is always greater than 90° within the movement range of the lens carrier.

[0020] In one of the embodiments, the first correction yoke of each set of correction assemblies is located closer to the first bent segment than the second correction yoke.

[0021] The second aspect of the present application provides a camera module, comprising an optical lens, a photosensitive module, a shell and the lens driving module described above; the optical lens is arranged on the lens carrier and used for receiving light along the first direction and emitting; the photosensitive module is arranged on the base and used for receiving the light emitted by the optical lens to form an image; the shell is arranged on the lens driving module.

[0022] The lens driving module described above, by arranging the correction magnet and the correction yoke which have an offset along the tangential direction of the central axis of the lens carrier, so that the magnetic attraction force between the correction yoke and the correction magnet must have a magnetic attraction component along the tangential direction of the central axis of the lens carrier, which can form a magnetic moment opposite to the direction of the deflection torque, and is used to offset 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;

[0023] In addition, compared with dividing each correction yoke into two equal length parts, dividing each correction yoke into two asymmetric parts with different lengths in the present application can obtain stronger restoring force and better correction effect. It should be understood that the correction yoke is divided into a first correction yoke with a longer length and a second correction yoke with a shorter length along the tangential direction of the central axis of the lens carrier, so that the correction yoke forms an asymmetric layout around the central axis of the lens carrier. It should be understood that due to the molding precision of parts, assembly and other reasons, the linearity of the lens carrier will be slightly offset when it moves under the drive of the driving assembly, and in the present application, the change of the relative position between the correction magnet and the correction yoke causes the change of the magnetic flux distribution, and the longer structure of the first correction yoke makes it have stronger magnetic flux concentration ability, so as to increase the magnetic moment between the correction yoke and the correction magnet, and then compensate the deflection in principle. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a perspective view of the camera module of the present application;

[0025] Figure 2 It is a perspective view of one embodiment of the lens driving module of the present application;

[0026] Figure 3 It is an exploded view of Figure 2 ;

[0027] Figure 4 It is a perspective view of the curved circuit board, the lens module, the ball and the correction yoke in the direction of view from above in Figure 2 ;

[0028] Figure 5 It is an enlarged view of the base in Figure 3 ;

[0029] Figure 6 It is anFigure 5 A three-dimensional image from another angle;

[0030] Figure 7 This is a perspective schematic diagram of a bent circuit board, a lens module, a ball bearing, and a correction yoke in a top view in another embodiment of the lens driving module of the present application;

[0031] Figure 8 This is a perspective schematic diagram of a bent circuit board, a lens module, a ball bearing, and a correction yoke in a top view in another embodiment of the lens driving module of the present application;

[0032] Figure 9 for Figure 3 A magnified view of a mid-bend circuit board;

[0033] Figure 10 for Figure 4 Schematic diagram of the three deformation angles of the mid-bend circuit board.

[0034] Reference numerals: 100, lens drive module; 10, base; 11, first ball bearing groove; 20, lens carrier; 20a, anti-shake carrier; 20b, focus carrier; 21, second ball bearing groove; 30, drive assembly; 31, anti-shake drive assembly; 311, anti-shake drive magnet; 312, anti-shake drive coil; 32, focus drive assembly; 321, focus drive magnet; 322, focus drive coil; 40, bent circuit board; 41, fourth Circuit board section; 42, third bending section; 43, first circuit board section; 44, first bending section; 45, second circuit board section; 46, second bending section; 47, third circuit board section; 48, fixing plate; 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 DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of the application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0040] It is to be noted that when an element as referred to as being "on" or "connected to" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar terms as used herein are for the purpose of description only and are not intended to be limiting.

[0041] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the present application first provides a lens driving module for carrying an optical lens 200, comprising a base 10, a lens carrier 20 movably arranged on the base 10, a driving assembly 30 configured to drive the lens carrier 20 to move relative to the base 10, and a correction assembly 50 comprising a correction magnet and a correction yoke 51, one of which is arranged on the lens carrier 20, and the other is arranged on the base 10 in a first direction parallel to the optical axis of the optical lens 200, each correction yoke 51 comprises a first correction yoke 511 and a second correction yoke 512 arranged in a direction parallel to the width 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 that of the second correction yoke 512, and the center line of the correction magnet passes through the first correction yoke 511.

[0042] In the present application, by arranging a correction magnet and a correction yoke 51 with a deviation in the tangential direction of the central axis of the lens carrier 20 (refer to Figure 4 , i.e. the direction parallel to the side length of the lens carrier 20), the magnetic attraction force between the correction yoke 51 and the correction magnet will inevitably have a magnetic attraction component in the tangential direction of the central axis of the lens carrier 20, which can form a magnetic torque opposite to the direction of the deflection torque, and is used to offset the unintended rotation of the lens carrier 20 under the action of the deflection torque, thereby reducing the influence of the deflection torque on the movement of the lens carrier 20. The above-mentioned deflection torque includes but is not limited to the reset torque generated after the bending of the circuit board 40, and the slight deviation of the lens carrier 20 during movement due to the forming precision of the parts, assembly, etc.

[0043] Further, the correction yoke 51 and the correction magnet also have a magnetic attractive component in the first direction, which can improve the attachment reliability between the base 10 and the lens carrier 20, and reduce the risk of separation. On this basis, each correction yoke 51 is divided into a first correction yoke 511 and a second correction yoke 512 arranged at intervals. Compared with a single correction yoke 51, the single correction yoke 51 cannot be completely opposite to the correction magnet to ensure that there is a deviation between the center and the center of the correction magnet, thereby resulting in a relatively small overlapping area between the two and a relatively weak magnetic attraction. However, the two-segment correction yoke 51 does not have this problem. That is, in the present application, by dividing each correction yoke 51 into a first correction yoke 511 and a second correction yoke 512 arranged at intervals, the magnetic attraction stability between the base 10 and the lens carrier 20 can be improved.

[0044] Further, compared with dividing each correction yoke 51 into two segments of equal length, dividing each correction yoke 51 into two segments of different lengths in the present application can obtain stronger restoring force and better correction effect. It should be understood that the correction yoke 51 is divided into a first correction yoke 511 with a longer length and a second correction yoke 512 with a shorter length along the tangential direction of the central axis of the lens carrier 20, 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 part forming precision, assembly, and other reasons, the linearity of the lens carrier 20 when moving under the drive of the drive assembly 30 will be slightly deviated, and in the present application, the change in the relative position between the correction magnet and the correction yoke 51 causes the magnetic flux distribution to change, and the longer structure of the first correction yoke 511 makes it have stronger magnetic flux convergence capability to increase the magnetic moment (i.e., the correction moment) between the correction yoke 51 and the correction magnet, thereby compensating for the deviation in principle.

[0045] In some embodiments, the optical lens 200 is arranged at the center position of the lens carrier 20, and at this time the optical axis O of the optical lens 200 is the central axis of the lens carrier 20. In other embodiments, the optical lens 200 can be arranged offset on the lens carrier 20 to meet the miniaturization requirement of the lens drive module, and at this time the optical axis O is parallel to but not coincident with the central axis of the lens carrier 20.

[0046] It should be noted that the width direction of the lens carrier 20 refers to the length direction of each side of the lens carrier 20. For example, for a lens carrier 20 with a rectangular cross-section, the length direction of the first correction yoke 511 and the second correction yoke 512 is parallel to the length direction of one side of the lens carrier 20, and the first correction yoke 511 and the second correction yoke 512 are arranged at intervals along the length direction of the side of the lens carrier 20.

[0047] In addition, the lens carrier 20 includes an anti-shake carrier 20a and a focusing carrier 20b, one of which carries the optical lens 200, and one of which 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.

[0048] Please refer to Figure 2 , Figure 3 and Figure 4 , the lens driving module 100 further includes at least one bent circuit board 40, which 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, and is fixed to the base 10 and electrically connected to the driving assembly 30. The bent circuit board 40 is connected to one side of the lens carrier 20 via a corner of the lens carrier 20.

[0049] Since the bent circuit board 40 is connected to one side of the lens carrier 20 via a corner of the lens carrier 20, when the lens carrier 20 moves under the driving of the driving assembly 30, the bent circuit board 40 will be deformed under the driving of the lens carrier 20. The deformed bent circuit board 40 has a force tending to move in the opposite direction of the deformation direction. For the convenience of description, the reverse force tending of the bent circuit board 40 is defined as a reset torque in this application; under the action of the reset torque, the lens carrier 20 is easy to have a large deflection, thereby affecting the normal operation of the anti-shake function.

[0050] In this application, the magnetic attraction force between the correction assembly 50 forms a magnetic torque opposite to the direction of the reset torque, and is used to offset the unintended rotation of the lens carrier 20 under the action of the reset torque, thereby reducing the influence of the reset torque of the bent circuit board 40 on the movement of the lens carrier 20.

[0051] Please refer to Figure 4As shown, the first correction yoke 511 and the second correction yoke 512 are both in straight strip shape, the perpendicular line from the central axis of the lens carrier 20 to the correction yoke 51 falls 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. When the lens carrier 20 rotates around its central axis, the falling point of the perpendicular line from the central axis of the lens carrier 20 to the correction yoke 51 is 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 relatively close to the perpendicular line of the central axis of the lens carrier 20. According to the principle of lever, the magnetic resistance arm generated at the first correction yoke 511 is longer, and under the same magnetic force, the correction torque can be amplified to obtain better correction ability.

[0052] In other embodiments, the first correction yoke 511 and the second correction yoke 512 can also be arc-shaped, as long as in the movable track of the lens carrier 20, the correction magnet can receive asymmetric magnetic attraction force from the first correction yoke 511 and the second correction yoke 512, the magnetic attraction force of the first correction yoke 511 is greater than that of the second correction yoke 512, and the direction of the magnetic attraction force of the first correction yoke 511 is different from the direction of the reset torque of the curved circuit board 40. 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 of which includes an anti-shake driving magnet 311 and an anti-shake driving coil 312 facing in the first direction, one of which is arranged on the lens carrier 20 and the other of which 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.

[0053] Further, in some embodiments, the anti-shake driving magnet 311 is a correction magnet, so that the anti-shake driving magnet 311 can cooperate with the correction yoke 51 to realize the magnetic attraction correction function while cooperating with the anti-shake driving coil 312 to drive the lens carrier 20, thereby reducing the number of internal parts of the lens driving module and improving the overall structural integration.

[0054] Of course, in other embodiments, the anti-shake driving magnet 311 and the correction magnet can also be two independent parts.

[0055] Please refer to Figure 5 and Figure 6As shown, in some embodiments, 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 ball grooves corresponding to the balls 60 respectively and having a diameter larger than that of the corresponding ball 60, each ball 60 is movably clamped between a corresponding set of ball grooves to form a fulcrum at the bottom wall of the ball groove and support the lens carrier 20 to move relative to the base 10.

[0056] 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 can be understood that, the lens carrier 20 is not limited in the second direction and the third direction, and the restoring torque of the bent circuit board 40 on the lens carrier 20 will be more obvious, that is, the lens carrier 20 is more likely to be deflected under the influence of the bent circuit board 40; and in the present application, the cooperation of the above-mentioned correction yoke 51 and the correction magnet can effectively reduce the influence of the bent circuit board 40 on the movement of the lens carrier 20.

[0057] Specifically, the base 10 is provided with a plurality of first ball grooves 11 corresponding to the balls 60, and the lens carrier 20 is provided with a plurality of second ball grooves 21 corresponding to the balls 60, each ball 60 is movably clamped between the corresponding first ball groove 11 and the second ball groove 21.

[0058] More specifically, in some embodiments, the first ball groove 11 and / or the second ball groove 21 is embedded with a gasket, the gasket is made of metal or other high-strength materials to increase the structural strength of the bottom of the first ball groove 11 and / or the second ball groove 21, and to avoid deformation of the lens driving module due to excessive pressure of the ball 60 on the groove bottom during use. Preferably, the base 10 and the lens carrier 20 are made of plastic, and the gasket is made of metal and is integrally formed with the base 10 or the lens carrier 20 by insert molding process.

[0059] Please refer to Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the lens driving module 100 comprises at least two correction assemblies 50 and three balls 60 arranged circumferentially around the optical axis O, each correction assembly 50 is distributed apart from the projection of each ball 60 in the first direction, that is, the correction assembly 50 is arranged inside each ball 60 to ensure that the deflection magnetic torque can act on the rotation plane formed by each ball 60, or to ensure that the deflection magnetic torque can act on the rotation central axis formed by two balls 60.

[0060] Specifically, the three balls 60 are a first ball 61, a second ball 62, and a third ball 63, one set of correction assemblies 50 is located between the second ball 62 and the third ball 63, and another set of correction assemblies 50 is located between the first ball 61 and the second ball 62, so as to ensure that the deflection magnetic moment of one set of correction assemblies 50 can act on the center line of the second ball 62 and the third ball 63, and the deflection magnetic moment of another set of correction assemblies 50 can act on the center line of the first ball 61 and the second ball 62.

[0061] It should be understood that the three-point support structure formed by the three balls 60 can realize stable support of the lens carrier 20 while occupying relatively small space, and balance the requirements of movement freedom and structural stability required by the anti-shake function in limited space, which is conducive to the miniaturization of the overall structure of the lens driving module; and the correction assemblies 50 are arranged between the balls 60, which can further improve the correction effect of the correction assemblies 50.

[0062] Please refer to Figure 4 In some embodiments, the projection of the lens carrier 20 along the first direction is a rectangle, the projections of the three balls 60 along the first direction correspond to three adjacent corners of the projected rectangle of the lens carrier 20 respectively, and the lens driving module 100 includes at least two sets of correction assemblies 50, and the two sets of correction assemblies 50 are symmetrically arranged with respect to the diagonal line passing through the other corner of the projected rectangle.

[0063] 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 assemblies 50 is located between the second ball 62 and the third ball 63 along the second direction, and another set of correction assemblies 50 is located between the first ball 61 and the second ball 62 along the third direction, and the two sets of correction assemblies 50 are symmetrically arranged with respect to the diagonal line passing through the second ball 62.

[0064] It should be understood that the magnetic moment of the correction assembly 50 has a direction, by symmetrically arranging the two sets of correction assemblies 50 with respect to the diagonal line passing through the other corner of the projected rectangle, that is, the first correction yoke 511 of the two sets of correction assemblies 50 is located on the side close to the second ball 62, or the second correction yoke 512 of the two sets of correction assemblies 50 is located on the side close to the second ball 62, so that the directions of the magnetic moments of the two sets of correction assemblies 50 are opposite, the correction directions of the two sets of correction assemblies 50 can be complementary, and then a certain degree of correction compensation is allowed without deflection caused by the magnetic moment.

[0065] Of course, please refer to Figure 7As shown, in some embodiments, the two sets of correction assemblies 50 are arranged in opposite rotation directions, that is, the first correction magnetic yoke 511 of the two sets of correction assemblies 50 are located on the opposite sides of the second correction magnetic yoke 512 (clockwise side or counterclockwise side). At this time, the magnetic moment directions of the two sets of correction assemblies 50 are opposite, and the correction forces of the two sets of correction assemblies 50 are relatively small, which can effectively prevent the lens carrier 20 from being deflected.

[0066] Please refer to Figure 4 As shown, in some embodiments, the center of mass of the mobile body formed by the lens carrier 20 and the optical lens 200 is located on the side close to the correction assembly 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 restricts the rotation movement. It should be understood that the magnetic moment of the correction assembly 50 acting on the lens carrier 20 can be regarded as a force acting on the center of mass of the mobile body. Therefore, by setting the center of mass of the mobile body on the side close to the correction assembly 50, the magnetic moment can be reduced, thereby reducing the deflection of the mobile body caused by the correction assembly 50 itself. The second imaginary line is a virtual line parallel to the connecting line between the second ball 62 and the third ball 63 and passing through the central axis of the lens carrier 20. The third imaginary line is a virtual line parallel to the connecting line between the first ball 61 and the second ball 62 and passing through the central axis of the lens carrier 20.

[0067] Please refer to Figure 8 As shown, in some embodiments, the lens driving module 100 includes three sets of correction assemblies 50, and the projection of another set of correction assemblies 50 along the first direction is located at another top corner of the projection rectangle of the lens carrier 20 which does not correspond to the ball 60. This can further strengthen or weaken the influence of the reset moment of the bent circuit board 40, thereby better controlling the unintended rotation of the lens driving module.

[0068] Further, the third circuit board segment 47 of the bent circuit board 40 is attached to the lens carrier 20, and the projection of the third set of correction assemblies 50 along the first direction at least partially coincides with the third circuit board segment 47. It should be understood that since the attachment position of the third circuit board segment 47 to the lens carrier 20 is the deflection stress point of the lens carrier 20, setting a set of correction assemblies 50 at this position can better inhibit the reset moment of the bent circuit board 40, and the correction effect is more significant.

[0069] Of course, in other embodiments, if the space allows, the third set of correction assemblies 50 can also be arranged at other positions, such as being arranged opposite to the third circuit board segment 47 along the first direction, etc., as long as the projection of the correction assembly along the first direction at least partially coincides with the third circuit board segment 47.

[0070] Please refer to Figure 6 , Figure 9 and Figure 10 , in some embodiments, 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 O, wherein the second direction and the third direction are perpendicular to each other; the bent circuit board 40 comprises a fourth circuit board segment 41, a third bending segment 42, a first circuit board segment 43, a first bending segment 44, a second circuit board segment 45, a second bending segment 46 and a third circuit board segment 47 connected in sequence, the fourth circuit board segment 41 is fixed with the base 10 and extends along the first direction, the projections of the first circuit board segment 43, the second circuit board segment 45 and the third circuit board segment 47 along the first direction are U-shaped, and the first circuit board segment 43 and the third circuit board segment 47 are located on the two sides of a third imaginary line parallel to the third direction passing through the optical axis O, respectively, and the first bending segment 44 and the second bending segment 46 are located on the same side of a second imaginary line parallel to the second direction passing through the optical axis O.

[0071] Specifically, the third bending segment 42, the first bending segment 44 and the second bending segment 46 are formed by hot pressing and bending of the circuit board, and have a greater rigidity than other circuit board segments, which can maintain the overall bending shape of the bent circuit board 40 and is also the main source of the reset torque 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, which can adapt to the deformation of the lens carrier 20 in multiple degrees of freedom.

[0072] More specifically, the lens carrier 20 comprises an anti-shake carrier 20a and a focusing carrier 20b, the focusing carrier 20b is slidably arranged in the anti-shake carrier 20a along the first direction and is used to carry the optical lens 200, the driving assembly 30 further comprises a focusing driving assembly 32, the focusing driving coil 322 comprises a focusing driving coil 322 and a focusing driving magnet 321 arranged opposite to each other, the focusing driving magnet 321 is embedded in the focusing carrier 20b, and the focusing driving coil 322 is electrically connected with 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 in conduction with the welding point of the imaging circuit board in the base 10, so that single-way conduction from the base 10 to the focusing carrier 20b is realized through the bent circuit board 40. For simplicity of description, please refer to Figure 10 The included angle of the third bending segment 42 is defined as a first deformation angle A, the included angle of the first bending segment 44 is defined as a second deformation angle B, and the included angle of the second bending segment 46 is defined as a third deformation angle C.

[0073] Further, the elastic coefficient of the first deformation angle A along the second direction is greater than the elastic coefficient 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 the elastic coefficient 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 the elastic coefficients 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 the elastic coefficients of the first deformation angle A and the second deformation angle B along the third direction.

[0074] Further, please refer to Figure 10 As shown in the drawings, when the lens carrier 20 starts to move along the positive direction of the second direction shown in the drawings, 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 drawings, both the first deformation angle A and the second deformation angle B increase.

[0075] Please refer to Figure 10 As shown in the drawings, in some embodiments, the center of mass of the lens carrier 20 is located on the side of the first bending section 44 and the second bending section 46 with the second imaginary line as the boundary. 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 restricts the rotation movement, and therefore, the restoring torque of the bending circuit board 40 on the lens carrier 20 can be regarded as the force acting on the center of mass of the lens carrier 20. Therefore, by setting the center of mass of the lens carrier 20 on the side of the first bending section 44 and the second bending section 46 relative to the second imaginary line, the restoring torque can be effectively reduced, thereby reducing the deflection effect of the bending circuit board 40 on the lens carrier 20.

[0076] Preferably, the center of mass of the moving body formed by the lens carrier 20 and the optical lens 200 is located on the side of the first bending section 44 and the second bending section 46 relative to the second imaginary line, so as to reduce the deflection effect of the bending circuit board 40 on the moving body.

[0077] Please refer to Figure 4 and Figure 10 As shown in the drawings, 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 coincide with the correction assembly 50. On the one hand, the partial coincidence of the circuit board sections and the correction assembly 50 in the first direction can achieve full utilization of the vertical space and reduce the overall thickness, which is suitable for the compactness requirement of the lens driving module. On the other hand, when the circuit board sections generate a restoring torque due to deformation, the magnetic torque for correction of the correction assembly 50 directly acts on the deformation source vicinity of the circuit board sections, thereby reducing the deflection of the lens carrier 20 caused by the bending circuit board 40.

[0078] Further, please refer toFigure 4 and Figure 10 As shown in FIG. 6 and FIG. 7, in some embodiments, the projection of the first bending section 44 along the first direction is located between the two sets of correction assemblies 50. It should be understood that, since the angle of the first deformation angle A is large, 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, and thus the second deformation angle B, that is, the first bending section 44, is the main source of the elastic deformation of the bending circuit board 40 and the generated restoring torque; on this basis, the first bending section 44 is arranged between the two sets of correction assemblies 50, and the magnetic torque generated by the two sets of correction assemblies 50 can better compensate for the restoring torque generated by the first bending section 44, thereby reducing the deflection influence of the bending circuit board 40.

[0079] Further, please refer to FIG. 8 and FIG. 9, in some embodiments, the first correction magnetic yoke 511 of each set of correction assemblies 50 is located on the side close to the first bending section 44 compared with the second correction magnetic yoke 512, so as to obtain a better correction effect. Figure 4 and Figure 10 Further, please refer to FIG. 8 and FIG. 9, in some embodiments, the first correction magnetic yoke 511 of each set of correction assemblies 50 is located on the side close to the first bending section 44 compared with the second correction magnetic yoke 512, so as to obtain a better correction effect.

[0080] Please refer to FIG. 10 and FIG. 11, in some embodiments, the first bending section 44 and the second bending section 46 are fixedly attached with a fixing sheet 48 on the side away from the shaft, and the rigidity of the fixing sheet 48 is greater than that of the corresponding bending circuit board 40. It should be understood that, although the first bending section 44 and the second bending section 46 have initial rigidity after hot-press forming, they may still be offset under long-term dynamic load. The fixing sheet 48 can further strengthen the rigidity of the first bending section 44 and the second bending section 46 by supporting the bending angle from the outside, so that the first bending section 44 and the second bending section 46 can maintain the preset bending shape. Figure 10 In addition, in an ideal state, each bending section is absolutely rigid, and each circuit board section is absolutely flexible, so that only the flexible circuit board sections are deformed when the lens carrier 20 moves, and in this case, the bending circuit board 40 will not generate a restoring torque. In the present application, by increasing the rigidity of the first bending section 44 and the second bending section 46 through the fixing sheet 48, the deformable area of the bending circuit board 40 can be as small as possible in the flexible circuit part (i.e., each circuit board section), so that only the predetermined flexible area is allowed to deform controllably when the lens carrier 20 moves, thereby reducing the restoring torque generated by the unintended rigidity of the bending circuit board 40 on the lens carrier 20, and improving the displacement response accuracy of the lens driving module in the optical anti-shake process.

[0081] Please refer to FIG. 12 and FIG. 13.

[0082] Figure 10 ​As shown, in some embodiments, the bending circuit board 40 is in the undeformed state when the lens carrier 20 is located at the limit position close to the first circuit board segment 43 along the second direction and at the limit position away from the second circuit board segment 45 along the third direction. Since the second deformation angle B is the main source of the elastic deformation of the bending circuit board 40 and the generation of the restoring torque, it is referred to Figure 10 By installing the bending circuit board 40 at the limit position of the lens carrier 20 along the negative direction of the second direction and at the limit position along the negative direction of the third direction, the deformation direction of the bending circuit board 40 is always counterclockwise around the optical axis O, that is, the deformation and the restoring torque of the bending circuit board 40 have a single direction, so that the compensation of the restoring torque by the correction assembly 50 is facilitated.

[0083] Please refer to Figure 10 As shown, in some embodiments, the bending angle of the first bending segment 44 is always greater than 90° within the movement range of the lens carrier 20. The structure with a larger opening angle can realize deformation in multiple directions and ensure the deformable direction of the bending circuit board 40. In combination with the structure and elastic coefficient design of the first deformation angle A and the third deformation angle C, the restoring torque of the bending circuit board 40 after deformation can be relatively controlled. Preferably, the bending angle of the first bending segment 44 is 100°-130° to adapt to the larger movement stroke of the lens carrier 20.

[0084] Please refer to Figure 1 and Figure 2 The second aspect of the present application provides a camera module, which comprises an optical lens 200, a photosensitive module, a shell 300, and the lens driving module 100 described above; the optical lens 200 is arranged on the lens carrier 20 and is used to receive light along the first direction and emit light; the photosensitive module is arranged on the base 10 and is used to receive the light emitted by the optical lens 200 for imaging; and the shell 300 covers the lens driving module 100.

[0085] The optical lens 200 is kept on the photosensitive path of the photosensitive module, the optical lens 200 comprises a lens barrel and at least one optical lens mounted in the lens barrel, and the optical lens has an optical axis O (see Figure 1 ) parallel to the first direction. The optical axis of the optical lens is also the optical axis of the at least one optical lens mounted in the lens barrel. The 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.

[0086] The photosensitive module comprises a photosensitive chip and an imaging circuit board, the photosensitive chip is used for receiving light reflected by an object collected by an optical lens 200 to form an image, and is electrically connected to other electronic devices through the imaging circuit board. The electronic element can be one or more of passive electronic devices such as resistors and capacitors, or one or more of active electronic devices such as driving chips and storage chips.

[0087] The imaging circuit board is provided with a hole in the middle, the photosensitive chip can be mounted in a sunken manner on the imaging circuit board, further, the photosensitive chip is mounted on the imaging circuit board in a flip-chip manner, and a photosensitive area of the photosensitive chip can be exposed through a hole area of the imaging circuit board; the base 10 is formed on the imaging circuit board, the base 10 is provided with a hole in the middle, and the photosensitive chip is exposed.

[0088] The technical features of the above-mentioned embodiments can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-mentioned embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered that it is within the scope of the present application.

[0089] The above-mentioned embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A lens driving module for carrying an optical lens (200), characterized in that: include: Base (10); A lens carrier (20) is movably arranged 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 assembly (50) comprising 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) comprising 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) being greater than that of the second correction yoke (512), and a projected area of ​​the first correction yoke (511) on the correction magnet along the first direction being greater than a projected area of ​​the second correction yoke (512) on the correction magnet along the first direction; The lens driving module (100) further comprises at least one bent circuit board (40), wherein the bent circuit board (40) is bent in a direction perpendicular to the optical axis of the optical lens (200) and at least partially adheres to the lens carrier (20), and the bent circuit board (40) is connected to a side surface of the lens carrier (20) via a corner of the lens carrier (20).

2. The lens driving module according to claim 1, wherein: 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 1, wherein: The projection of the lens carrier (20) along the first direction is rectangular; 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 vertex of the projected rectangle as the center.

4. The lens driving module according to claim 3, wherein: The lens driving module (100) comprises three groups of the correction components (50) and three balls (60) arranged circumferentially around the optical axis, and the correction components (50) and the balls (60) are spaced apart along the projection of the first direction; 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 projection rectangle of the lens carrier (20); the two groups of correction components (50) are symmetrically arranged with a diagonal line passing through another vertice of the projection rectangle as the center, and the projection of the other group of correction components (50) along the first direction is located at another vertice of the projection rectangle of the lens carrier (20) that does not correspond to the balls (60).

5. The lens driving module according to claim 3, wherein: 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) connected in sequence, wherein 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, and 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.

6. The lens driving module according to claim 5, characterized in that: Taking the second imaginary line as the 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.

7. The lens driving module according to claim 5, wherein: 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).

8. The lens driving module according to claim 5, wherein: A fixing plate (48) is fixedly attached 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 plate (48) is greater than that of the corresponding bending circuit board (40).

9. The lens driving module according to claim 5, wherein: 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.

10. A camera module, characterized in that: It comprises an optical lens (200), a photosensitive module, a housing (300), and a lens driving module (100) according to any one of claims 1 to 9; 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 light emitted by the optical lens (200) for imaging; The housing (300) is arranged to cover the lens driving module (100).

Images