Lens driving module and camera module

Abstract

The application relates to a lens driving module and a camera module. The lens driving module for carrying an optical lens comprises 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 is arranged on the base in a first direction parallel to the optical axis of the optical lens. Each correction yoke comprises a first correction yoke and a second correction yoke arranged in a lens carrier width direction, 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 that of the second correction yoke, and the center line of the correction magnet passes through the first correction yoke. The influence of the deflection torque on the movement of the lens carrier is reduced.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and in particular to a lens driving module and a camera module. Background Technology

[0002] With the widespread adoption of mobile electronic devices, the technology related to camera modules used in these devices to help users capture images has developed and progressed rapidly. Currently, consumers have an increasing demand for camera modules integrated into mobile electronic devices.

[0003] To reduce size and make the most of internal space, current camera modules typically use bent circuit boards. By bending the circuit board, multiple bending surfaces can be used to fit and attach it to the lens carrier, thereby achieving circuit conduction with a small footprint.

[0004] However, when the lens carrier moves to achieve functions such as image stabilization, the bent circuit board attached to the lens carrier will deform under the movement of the lens carrier. The elastic restoring tendency of the bent circuit board after deformation will act on the lens carrier, causing the actual amount of movement of the lens carrier to deviate or deflect from the expected amount of movement, thereby affecting the normal operation of the image stabilization function of the camera module. Summary of the Invention

[0005] Therefore, it is necessary to provide a lens drive module and camera module that can reduce the impact of bending the circuit board on the movement of the lens carrier, in order to address the current problem that bending the circuit board can cause the lens carrier to shift or deflect.

[0006] This 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 along 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 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 projected area of ​​the first correction yoke on the correction magnet along the first direction is greater than the projected area of ​​the second correction yoke on the correction magnet along the first direction, and the centerline of the correction magnet passes through the first correction yoke.

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

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

[0009] In one embodiment, the lens driving module further includes at least three balls, and the lens carrier and the base have multiple sets of ball grooves that correspond one-to-one with each of the balls and have a diameter larger than the corresponding balls. Each ball 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 relative to the base.

[0010] In one embodiment, the lens driving module includes at least two sets of the correction components and three balls arranged circumferentially around the optical axis, with each correction component and each ball distributed at a projection interval along the first direction.

[0011] 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 correspond to the three adjacent vertices of the projection rectangle of the lens carrier; the lens driving module includes at least two sets of the correction components, and the two sets of correction components are symmetrically arranged with the diagonal passing through another vertices of the projection rectangle as the center.

[0012] 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 apex of the projection rectangle of the lens carrier that does not correspond to the ball.

[0013] In one embodiment, the driving assembly includes two sets of image stabilization driving assemblies configured to drive the lens carrier to move relative to the base along a second direction perpendicular to the optical axis and a third direction, wherein the second direction and the third direction are perpendicular to each other; the bending circuit board includes a first circuit board segment, a first bending segment, a second circuit board segment, a second bending segment, and a third circuit board segment connected in sequence, wherein 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 bending segment and the second bending segment are located on the same side of a second imaginary line passing through the optical axis parallel to the second direction.

[0014] In one embodiment, the center of mass of the lens carrier is located on the side containing the first bend segment and the second bend segment, with the second imaginary line as the dividing line.

[0015] In one embodiment, 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 component.

[0016] In one embodiment, a fixing plate is attached to the side of the first bending segment and the second bending segment away from the axis, and the rigidity of the fixing plate is greater than that of the corresponding bending circuit board.

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

[0018] In one embodiment, the projection of the first bent segment along the first direction is located between the two sets of the corrective components.

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

[0020] In one embodiment, the first corrective yoke of each set of corrective components is located on the side closer to the first bending segment than the second corrective yoke.

[0021] A second aspect of this application provides a camera module, including an optical lens, a photosensitive module, a housing, and the aforementioned lens driving module; the optical lens is disposed on the lens carrier and is used to receive and emit light along a first direction; the photosensitive module is disposed on the base and is used to receive the light emitted by the optical lens for imaging; the housing covers the lens driving module.

[0022] The aforementioned lens drive module, by setting a corrective magnet and a corrective yoke whose center is offset in the tangential direction along the central axis of the lens carrier, ensures that the magnetic attraction between the corrective yoke and the corrective magnet will inevitably 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.

[0023] Furthermore, compared to symmetrically dividing each corrective yoke into two equal segments, this application divides each corrective yoke into two asymmetrical segments of different lengths, achieving stronger restoring force and superior corrective effect. It should be understood that dividing the corrective yoke tangentially along the lens carrier's central axis into a longer first corrective yoke and a shorter second corrective yoke creates an asymmetrical layout of the corrective yokes around the lens carrier's central axis. It should also be understood that due to factors such as component molding precision and assembly, the linearity of the lens carrier may experience slight deviations during movement driven by the drive assembly. In this application, the change in the relative position between the corrective magnet and the corrective yoke induces a change in magnetic flux distribution, and the longer structure of the first corrective yoke provides stronger magnetic flux focusing capability, increasing the magnetic torque between the corrective yoke and the corrective magnet, thereby compensating for the deflection in principle. Attached Figure Description

[0024] Figure 1 This is a perspective view of the camera module of this application;

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

[0026] Figure 3 for Figure 2 Exploded view;

[0027] Figure 4 for Figure 2 A perspective view of the bent circuit board, lens module, ball bearings, and corrective yoke from a top-down perspective.

[0028] Figure 5 for Figure 3 Enlarged view of the base;

[0029] Figure 6 for Figure 5 A stereoscopic view from another angle;

[0030] Figure 7 This is a perspective view of the bent circuit board, lens module, ball bearings, and corrective magnetic yoke in another embodiment of the lens drive module of this application, viewed from above.

[0031] Figure 8 This is a perspective view of the bent circuit board, lens module, ball bearings, and corrective magnetic yoke in another embodiment of the lens drive module of this application, viewed from above.

[0032] Figure 9 for Figure 3 Enlarged view of the circuit board with a medium bend;

[0033] Figure 10 for Figure 4 A schematic diagram of the three deformation angles of a circuit board in a bending phase.

[0034] Reference numerals: 100, Lens drive module; 10, Base; 11, First ball bearing groove; 20, Lens carrier; 20a, Image stabilization carrier; 20b, Focusing carrier; 21, Second ball bearing groove; 30, Drive assembly; 31, Image stabilization drive assembly; 311, Image stabilization drive magnet; 312, Image stabilization drive coil; 32, Focusing drive assembly; 321, Focusing drive magnet; 322, Focusing drive coil; 40, Bending circuit board; 41, Fourth... 42. Circuit board segment; 43. Third bend segment; 44. First circuit board segment; 45. First bend segment; 46. Second bend segment; 47. Third circuit board segment; 48. Fixing piece; 50. Correction assembly; 51. Correction yoke; 511. First correction yoke; 512. Second correction yoke; 60. Ball bearing; 61. First ball bearing; 62. Second ball bearing; 63. Third ball bearing; 200. Optical lens; 300. Housing. Detailed Implementation

[0035] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening 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 intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0041] Please combine Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, this 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 opposite to the base 10 along 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 apart 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 projected area of ​​the first correction yoke 511 on the correction magnet along the first direction is greater than that of the second correction yoke 512 on the correction magnet along the first direction, and the centerline of the correction magnet passes through the first correction yoke 511.

[0042] In this application, the center is set along the tangential direction of the central axis of the lens carrier 20 (refer to...). Figure 4 The corrective magnet and the corrective yoke 51 are offset in a direction parallel to the side length of the lens carrier 20, so that the magnetic attraction between the corrective yoke 51 and the corrective magnet will necessarily have a magnetic attraction component in the tangential direction along the central axis of the lens carrier 20. 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 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 aforementioned deflection torque includes, but is not limited to, the reset torque generated after the bending of the circuit board 40, and the slight offset during the movement of the lens carrier 20 due to the molding precision of the parts, assembly, etc.

[0043] Furthermore, the corrective yoke 51 and the corrective magnet also have a magnetic attraction component along the first direction. This magnetic attraction component can improve the attachment reliability between the base 10 and the lens carrier 20 and reduce the risk of them separating. Based on this, each corrective yoke 51 is divided into a first corrective yoke 511 and a second corrective yoke 512 that are spaced apart. Compared with a single-segment corrective yoke 51, which cannot be perfectly aligned with the corrective magnet in order to ensure that the center of the single-segment corrective yoke 51 is offset from the center of the corrective magnet, resulting in a relatively small overlap area and a relatively weak magnetic attraction, the two-segment corrective yoke 51 does not have this problem. In other words, in this application, by dividing each corrective yoke 51 into a first corrective yoke 511 and a second corrective yoke 512 that are spaced apart, the magnetic attraction stability between the base 10 and the lens carrier 20 can be improved.

[0044] Furthermore, compared to symmetrically dividing each corrective yoke 51 into two equal segments, this application divides each corrective yoke 51 into two asymmetrical segments of different lengths, achieving stronger restoring force and better corrective effect. It should be understood that dividing the corrective yoke 51 tangentially along the central axis of the lens carrier 20 into a longer first corrective yoke 511 and a shorter second corrective yoke 512 creates an asymmetrical layout of the corrective yokes around the central axis of the lens carrier 20. It should be understood that due to factors such as component molding precision and assembly, the linearity of the lens carrier 20 may experience slight deviations when driven by the drive assembly 30. In this application, the change in the relative position between the corrective magnet and the corrective yoke 51 induces a change in magnetic flux distribution, and the longer structure of the first corrective yoke 511 provides stronger magnetic flux focusing capability, increasing the magnetic torque (i.e., corrective torque) between the corrective yoke 51 and the corrective magnet, thereby compensating for the deflection in principle.

[0045] In some embodiments, the optical lens 200 is positioned at the center of the lens carrier 20, and 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 may also be offset from the lens carrier 20 to meet the miniaturization requirements of the lens drive module, in which case the optical axis O is parallel to but does not coincide with the central axis of the lens carrier 20.

[0046] It should be noted that the width direction of the lens carrier 20 mentioned above 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 direction of the first corrective magnetic yoke 511 and the second corrective magnetic yoke 512 is parallel to the side length direction of one side of the lens carrier 20, and the first corrective magnetic yoke 511 and the second corrective magnetic yoke 512 are spaced apart along the side length direction of that side of the lens carrier 20.

[0047] Furthermore, the aforementioned lens carrier 20 includes an image stabilization carrier 20a and a focusing carrier 20b. One of the image stabilization carrier 20a and the focusing carrier 20b is used to support the optical lens 200, and the one supporting the optical lens 200 is movably disposed on the other, while the other is movably disposed on the base 10. For example, the focusing carrier 20b supports the optical lens 200 and is movably disposed within the image stabilization carrier 20a along a first direction, while the image stabilization carrier 20a is movably disposed on the base 10 along a second and third direction; or the image stabilization carrier 20a supports the optical lens 200 and is movably disposed within the focusing carrier 20b along a second and third direction, while the focusing carrier 20b is movably disposed on the base 10 along the first direction.

[0048] Please combine Figure 2 , Figure 3 as well as Figure 4 As shown, the lens drive module 100 also includes at least one bent circuit board 40. The bent circuit board 40 is bent in a direction perpendicular to the optical axis of the optical lens 200 and is at least partially attached to the lens carrier 20. The bent circuit board 40 is fixed to the base 10 and electrically connected to the drive assembly 30. The bent circuit board 40 is connected to one side of the lens carrier 20 via one corner of the lens carrier 20.

[0049] Since the bent circuit board 40 is connected to one side of the lens carrier 20 via one corner, when the lens carrier 20 moves under the drive of the drive assembly 30, the bent circuit board 40 will deform under the influence of the lens carrier 20. The deformed bent circuit board 40 has a tendency to exert force in the opposite direction of the deformation direction. For ease of description, this reverse force tendency of the bent circuit board 40 is defined as the reset torque in this application. Under the action of the reset torque, the lens carrier 20 is prone to large deflection, thereby affecting the normal operation of the image stabilization function.

[0050] In this application, the magnetic attraction between the correction components 50 forms a magnetic torque opposite to the direction of the reset torque, and is used to counteract 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, both the first corrective yoke 511 and the second corrective yoke 512 are straight strips. The perpendicular line from the central axis of the lens carrier 20 to the corrective yoke 51 falls on the first corrective yoke 511, and the perpendicular line from the central axis of the lens carrier 20 to the corrective yoke 51 does not pass through the second corrective yoke 512. When the lens carrier 20 rotates around its own central axis, the perpendicular line from the central axis of the lens carrier 20 to the corrective yoke 51 falls on the first corrective yoke 511 (i.e., the perpendicular line from the central axis of the lens carrier 20 points to the first corrective yoke 511), so that the center of the first corrective yoke 511 is closer to the perpendicular line from the central axis of the lens carrier 20. According to the lever principle, the magnetic resistance arm generated at the first corrective yoke 511 is longer, and under the same magnetic force, the corrective torque can be amplified to obtain a better corrective ability.

[0052] In some other embodiments, the first corrective yoke 511 and the second corrective yoke 512 may also be arc-shaped, as long as it is ensured that the corrective magnet can receive asymmetrical magnetic attraction from the first corrective yoke 511 and the second corrective yoke 512 within the movable trajectory of the lens carrier 20, the magnetic attraction of the first corrective yoke 511 is greater than that of the second corrective yoke 512, and the direction of the magnetic attraction of the first corrective yoke 511 is in a different direction from the direction of the reset torque of the bent circuit board 40. Please refer to... Figure 3 , Figure 5 as well as Figure 6 As shown, in some embodiments, the driving assembly 30 includes two sets of image stabilization driving assemblies 31. Each set of image stabilization driving assemblies 31 includes an image stabilization driving magnet 311 and an image stabilization driving coil 312 facing each other along a first direction. One of the image stabilization driving magnet 311 and the image stabilization driving coil 312 is disposed on the lens carrier 20, and the other is disposed on the base 10. One set of image stabilization driving assemblies 31 is used to drive the lens carrier 20 to move relative to the base 10 along a second direction, and the other set of image stabilization driving assemblies 31 is used to drive the lens carrier 20 to move relative to the base 10 along a third direction.

[0053] Furthermore, in some embodiments, the image stabilization drive magnet 311 is a correction magnet, so that while the image stabilization drive magnet 311 works with the image stabilization drive coil 312 to drive the lens carrier 20, it can also work with the correction yoke 51 to achieve magnetic attraction correction function, thereby reducing the number of internal parts of the lens drive module and improving the overall structural integration.

[0054] Of course, in some other embodiments, the anti-shake drive magnet 311 and the correction magnet may also be two separate parts.

[0055] Please combine Figure 5 as well as Figure 6As shown, in some embodiments, the lens drive module 100 further includes at least three balls 60. The lens carrier 20 and the base 10 have multiple sets of ball grooves that correspond one-to-one with each ball 60 and have a diameter larger than the corresponding ball 60. Each ball 60 is movably clamped between the corresponding set of 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.

[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 roll freely within the ball groove while supporting the lens carrier 20, allowing the lens carrier 20 to move in multiple degrees of freedom relative to the base 10. It should be understood that since the lens carrier 20 is not restricted along the second and third directions, the restoring torque of the bending circuit board 40 on the lens carrier 20 will be more significant. In other words, the lens carrier 20 is more likely to deflect under the influence of the bending circuit board 40. However, in this application, the influence of the bending circuit board 40 on the movement of the lens carrier 20 can be effectively reduced through the cooperation of the aforementioned corrective yoke 51 and corrective magnet.

[0057] Specifically, the base 10 has a plurality of first ball grooves 11 corresponding to each ball 60, and the lens carrier 20 has 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 second ball groove 21.

[0058] 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 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 prevent deformation of the bottom of the groove due to excessive pressure from the balls 60 during use of the lens drive module. Preferably, the base 10 and the lens carrier 20 are made of plastic, and the gasket is made of metal. The gasket is integrally formed with the base 10 or the lens carrier 20 through an insert molding process.

[0059] Please combine Figure 4 , Figure 5 as well as 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 arranged circumferentially around the optical axis O. Each correction component 50 and each ball 60 are distributed at projection intervals along a first direction, that is, the correction component 50 is disposed inside each ball 60, so as 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 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. This ensures 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.

[0061] It is understandable that the three-point support structure formed by the three balls 60 can provide stable support for the lens carrier 20 while occupying relatively little space. It balances the freedom of movement and structural stability required for the image stabilization function within a limited space, which is conducive to the miniaturization of the overall structure of the lens drive module. Furthermore, placing the correction component 50 between the balls 60 can further improve the correction effect of the correction component 50.

[0062] 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 correspond to the three adjacent vertices of the projection rectangle of the lens carrier 20, respectively; the lens driving 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 passing through another vertices of the projection rectangle as the center.

[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 components 50 is located between the second ball 62 and the third ball 63 along the second direction, and another 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 passing through the second ball 62 as the center.

[0064] 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 passing through the other vertices of the projected rectangle as the center, that is, the first correction yoke 511 of the two sets of correction components 50 is located on the side close to the second ball 62, or the second correction yoke 512 of the two sets of correction components 50 is 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, thereby allowing a certain degree of correction compensation while preventing deflection due to magnetic torque.

[0065] 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 that cause the lens carrier 20 to deflect are too large, the two sets of correction components 50 can also be set 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 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 force of the two sets of correction components 50 is large, which can resist the situation of large deflection torque, but deflection may be caused by excessive magnetic torque.

[0066] Please refer to Figure 4 As shown, in some embodiments, the center of mass of the movable body formed by the lens carrier 20 and the optical lens 200 is located closer to the correction component 50 relative to the second or third imaginary line. Since the lens carrier 20 is supported by three freely movable ball bearings 60, the three support points of the lens carrier 20 do not have a clearly defined rotational axis that restricts rotational movement. It should be understood that the magnetic torque of the correction component 50 on the lens carrier 20 can be regarded as a force acting on the center of mass of the movable body. Therefore, setting the center of mass of the movable body closer to the correction component 50 can reduce the magnetic torque, thereby reducing the deflection effect of the correction component 50 itself on the movable body. The second imaginary line is a virtual line parallel to the line connecting the second ball bearing 62 and the third ball bearing 63 and passing through the central axis of the lens carrier 20. The third imaginary line is a virtual line parallel to the line connecting the first ball bearing 61 and the second ball bearing 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 drive module 100 includes three sets of correction components 50, and the projection of another set of correction components 50 along the first direction is located at the other apex of the projection rectangle of the lens carrier 20 that does not correspond to the ball 60; in order to further strengthen or weaken the effect of the reset torque of the bent circuit board 40, thereby better controlling the unintended rotation of the lens drive module of this application.

[0068] Furthermore, 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 components 50 along the first direction at least partially coincides with the third circuit board segment 47. It is easy to understand that since the attachment position of the third circuit board segment 47 and the lens carrier 20 is the deflection force point of the lens carrier 20, a set of correction components 50 is set at this position to better suppress the reset torque of the bent circuit board 40, and the correction effect is more significant.

[0069] Of course, in some other embodiments, if space permits, the third set of correction components 50 may also be set in other positions, such as being set directly opposite the third circuit board segment 47 along the first direction, as long as the projection of the correction component and the third circuit board segment 47 along the first direction at least partially overlaps.

[0070] Please combine Figure 6 , Figure 9 as well as Figure 10 As shown, in some embodiments, the two sets of image stabilization drive components 31 are configured to drive the lens carrier 20 to move relative to the base 10 along a second direction perpendicular to the optical axis O and a third direction, 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 along the first direction, the projection of the first circuit board segment 43, the second circuit board segment 45 and the third circuit board segment 47 along the first direction is 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, and 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.

[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. Their stiffness is greater than that of other circuit board segments, which can maintain the overall bending shape of the bent circuit board 40. They are also the main source of the restoring 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 includes an image stabilization carrier 20a and a focusing carrier 20b. The focusing carrier 20b is slidably disposed within the image stabilization carrier 20a along a first direction and is used to support the optical lens 200. The drive assembly 30 also includes a focusing drive assembly 32. The focusing drive coil 322 includes a focusing drive coil 322 and a focusing drive magnet 321 disposed opposite to it. The focusing drive magnet 321 is embedded in the focusing carrier 20b. The focusing drive 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 connected to the solder joint of the imaging circuit board in the base 10, thereby achieving single-path conduction from the base 10 to the focusing carrier 20b by bending the circuit board 40. For simplified description, please refer to [reference needed]. Figure 10 The included angle of the third bending segment 42 is defined as the first deformation angle A, the included angle of the first bending segment 44 is defined as the second deformation angle B, and the included angle of the second bending segment 46 is defined as the third deformation angle C.

[0073] Furthermore, the elastic coefficient of the first deformation angle A along the second direction is greater than that along the third direction, so as to provide 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, so as to provide deformation stroke along the third direction; the elastic coefficient of the third deformation angle C along the second direction is greater than that 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 that of the first deformation angle A and the second deformation angle B along the third direction.

[0074] For further details, 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 distortion angle A decreases and the second distortion 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 distortion angle A and the second distortion angle B increase.

[0075] Please refer to Figure 10 As shown, in some embodiments, the center of mass of the lens carrier 20 is located on the side where the first bending segment 44 and the second bending segment 46 are located, with the second imaginary line as the dividing line. As mentioned above, since the lens carrier 20 is supported by three freely moving ball bearings 60, the three support points of the lens carrier 20 do not have a clearly defined rotational axis that restricts rotational movement. 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, setting the center of mass of the lens carrier 20 relative to the second imaginary line on the side where the first bending segment 44 and the second bending segment 46 are located can effectively reduce the restoring torque, 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 segment 44 and the second bending segment 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 combine Figure 4 as well as Figure 10 As shown, in some embodiments, the projections of the first circuit board segment 43 and the second circuit board segment 45 along the first direction at least partially coincide with the correction component 50. On the one hand, the partial overlap of the circuit board segments and the correction component 50 in the first direction enables full utilization of vertical space, reduces the overall thickness, and is suitable for the compact requirements of the lens drive module. On the other hand, when the circuit board segment generates a reset torque due to deformation, the magnetic torque used by the correction component 50 for correction directly acts on the deformation source area of ​​the circuit board segment, thereby reducing the deflection of the lens carrier 20 caused by bending the circuit board 40.

[0078] Furthermore, please combine Figure 4 as well as Figure 10 As shown, in some embodiments, the projection of the first bending segment 44 along the first direction is located between the two sets of correction components 50. It should be understood that, since the first deformation angle A is relatively 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. Therefore, the second deformation angle B, i.e., the first bending segment 44, is the main source of elastic deformation and the generation of restoring torque in the bent circuit board 40. Based on this, by placing the first bending segment 44 between the two sets of correction components 50, the magnetic torque generated by the two sets of correction components 50 can better compensate for the restoring torque generated by the first bending segment 44, thereby reducing the deflection effect of the bent circuit board 40.

[0079] Furthermore, please combine Figure 4 as well as Figure 10 As shown, in some embodiments, the first corrective yoke 511 of each set of corrective components 50 is located closer to the first bending segment 44 than the second corrective yoke 512, in order to obtain a better corrective effect.

[0080] Please refer to Figure 10 As shown, in some embodiments, a fixing piece 48 is attached and fixed to the side of the first bent segment 44 and the second bent segment 46 away from the axis. The rigidity of the fixing piece 48 is greater than that of the corresponding bent circuit board 40. It should be understood that although the first bent segment 44 and the second bent segment 46 have initial rigidity after hot pressing, they may still shift under long-term dynamic load. The fixing piece 48 can further enhance the rigidity of the first bent segment 44 and the second bent segment 46 by externally supporting and solidifying the bending angle, so that the first bent segment 44 and the second bent segment 46 can maintain the preset bending shape.

[0081] Furthermore, ideally, each bending segment is absolutely rigid and each circuit board segment is absolutely flexible. In this case, only the flexible circuit board segments deform when the lens carrier 20 moves, and the bending circuit board 40 will not generate a restoring torque. However, in this application, by setting the fixing piece 48 to increase the stiffness of the first bending segment 44 and the second bending segment 46, the deformable area of ​​the bending circuit board 40 can be limited as much as possible to the flexible circuit part (i.e., each circuit board segment). This ensures that only the predetermined flexible area is allowed to undergo controllable deformation when the lens carrier 20 moves, thereby reducing the restoring torque generated by the unexpected stiffness of the bending circuit board 40 on the lens carrier 20 and improving the displacement response accuracy of the lens drive module in the optical image stabilization process.

[0082] Please refer to Figure 10As shown, in some embodiments, when the lens carrier 20 is located at its extreme position near the first circuit board segment 43 along the second direction and at its extreme position far from the second circuit board segment 45 along the third direction, the bent circuit board 40 is in an undeformed state. Since the second deformation angle B is the main source of elastic deformation and the generation of restoring torque in the bent circuit board 40, therefore, referring to... Figure 10 By installing the bent circuit board 40 at the extreme position of the lens carrier 20 in the negative direction of the second direction and 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 reset torque of the bent circuit board 40 have a single direction, so that the correction component 50 can compensate for the reset torque.

[0083] 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 bending segment 44 is always greater than 90°. This large angle structure can achieve deformation in multiple directions, ensuring the deformable direction of the bent circuit board 40. Combined with the structural and elastic coefficient design of the first deformation angle A and the third deformation angle C, the restoring torque of the bent circuit board 40 after deformation can be relatively controllable. Preferably, the bending angle of the first bending segment 44 is 100°~130° to accommodate the large movement stroke of the lens carrier 20.

[0084] Please combine Figure 1 as well as Figure 2 As shown, the second aspect of this application provides a camera module, including an optical lens 200, a photosensitive module, a housing 300, and the aforementioned lens driving module 100; the optical lens 200 is disposed on a lens carrier 20 and is used to receive light and emit it along a first direction; the photosensitive module is disposed on a 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.

[0085] The optical lens 200 is positioned along the light-sensing path of the photosensitive module. The optical lens 200 includes a lens barrel and at least one optical lens mounted within the lens barrel. The optical lens has an optical axis O parallel to a first direction (reference). Figure 1 The optical axis of the optical lens is also the optical axis of at least one optical lens mounted in the lens barrel. At least one optical lens is disposed in the lens barrel along the optical axis, and the photosensitive module is disposed opposite to the optical lens 200 along the optical axis direction.

[0086] The photosensitive module includes a photosensitive chip and an imaging circuit board. The photosensitive chip is used to receive the light reflected from the subject collected by the optical lens 200 to form an image, and is electrically connected to other electronic devices through the imaging circuit board. This electronic component can be one or more passive electronic devices such as resistors and capacitors, or one or more active electronic devices such as driver chips and memory chips.

[0087] An opening is made in the middle of the imaging circuit board, allowing the photosensitive chip to be recessed and mounted on the imaging circuit board. Furthermore, the photosensitive chip is mounted on the imaging circuit board in a flip-chip manner, 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 an opening is made in the middle of the base 10 to expose the photosensitive chip.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A lens driving module for carrying an optical lens (200), characterized in that, include: Base (10); The lens carrier (20) is movably disposed on the base (10); A drive assembly (30) is configured to drive the lens carrier (20) to move relative to the base (10); as well as The correction assembly (50) includes a correction magnet and a correction yoke (51), one of which is disposed on the lens carrier (20), and the other is disposed opposite to the base (10) along 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 apart 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), and the projected area of ​​the first correction yoke (511) on the correction magnet along the first direction is greater than the projected area of ​​the second correction yoke (512) on the correction magnet along the first direction. The lens drive module (100) further includes at least one bent circuit board (40), which is bent in a direction perpendicular to the optical axis of the optical lens (200) and is at least partially attached to the lens carrier (20). The bent circuit board (40) is connected to one side of the lens carrier (20) via one corner of the lens carrier (20).

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

3. The lens driving module according to claim 1, characterized in that, The projection of the lens carrier (20) along the first direction is rectangular; the lens driving module (100) includes at least two sets of the correction components (50), and the two sets of correction components (50) are symmetrically arranged with the diagonal line passing through the other apex of the projection of the lens carrier (20) as the center.

4. The lens driving module according to claim 3, characterized in that, The lens driving module (100) includes three sets of the correction components (50) and three balls (60) arranged circumferentially around the optical axis. Each correction component (50) and each ball (60) are distributed at projection intervals along 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 correspond to the three adjacent vertices of the projection of the lens carrier (20); the two sets of correction components (50) are symmetrically arranged with the diagonal passing through the other vertices of the projection of the lens carrier (20) as the center, and the projection of the other set of correction components (50) along the first direction is located at the other vertices of the projection of the lens carrier (20) that do not correspond to the balls (60).

5. The lens driving module according to claim 3, characterized in that, The drive assembly (30) includes two sets of image stabilization drive assemblies (31), which are configured to drive the lens carrier (20) to move relative to the base (10) along a second direction perpendicular to the optical axis and a third direction, wherein the second direction and the third direction are perpendicular to each other; The bent circuit board (40) includes 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 projection of the first circuit board segment (43), the second circuit board segment (45), and the third circuit board segment (47) along the first direction is U-shaped. The first circuit board segment (43) and the third circuit board segment (47) are located on both sides of a third imaginary line passing through the optical axis 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 parallel to the second direction.

6. The lens driving module according to claim 5, characterized in that, With the second imaginary line as the dividing line, the centroid of the lens carrier (20) is located on the side where the first bending segment (44) and the second bending segment (46) are located.

7. The lens driving module according to claim 5, characterized in that, The projections of the first circuit board segment (43) and the second circuit board segment (45) along the first direction at least partially coincide with the correction component (50).

8. The lens driving module according to claim 5, characterized in that, The first bending segment (44) and the second bending segment (46) are fixedly attached to a fixing piece (48) on the side away from the optical axis. The rigidity of the fixing piece (48) is greater than that of the corresponding bending circuit board (40).

9. The lens driving module according to claim 5, characterized in that, When the lens carrier (20) is located at the extreme position close to the first circuit board segment (43) along the second direction and at the extreme position far away from the second circuit board segment (45) along the third direction, the bent circuit board (40) is in an undeformed state.

10. A camera module, characterized in that, It includes an optical lens (200), a photosensitive module, a housing (300), and a lens drive module (100) as described in any one of claims 1 to 9. The optical lens (200) is disposed on the lens carrier (20) and is used to receive and emit light along the first direction; The photosensitive module is disposed on the base (10) and is used to receive the light emitted from the optical lens (200) for imaging; The housing (300) covers the lens drive module (100).

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