Lens driving device and camera module

Abstract

The present invention discloses a lens driving device and a camera module, which includes a movable carrier, a fixed base, a driving mechanism, a guide groove, a supporting mechanism, and a magnetic attraction component. The movable carrier is used to accommodate a lens assembly. The fixed base and the movable carrier are arranged opposite to each other along the optical axis. The driving mechanism is located on the peripheral side of the movable carrier. The driving mechanism includes at least one group of coils and at least one group of magnets. The guide groove is arranged between the fixed base and the movable carrier. The supporting mechanism is movably arranged in the guide groove. The magnetic attraction component is installed on the fixed base and arranged opposite to the magnet, so that a magnetic attraction force along the optical axis is generated between the magnetic attraction component and the magnet. Therefore, the structure is simple, and the camera module can be miniaturized while realizing the AF function of the lens in the optical axis direction and the OIS function on the plane orthogonal to the optical axis.

Description

Technical Field

[0001] The present invention relates to the technical field of camera modules, and in particular to a lens driving device and a camera module. Background Art

[0002] In the consumer electronics sector, especially smartphones, miniaturized and lightweight camera modules are essential components. Currently, portable devices are equipped with at least one camera module. To meet the growing market demand, camera modules are increasingly demanding features such as high pixel density and high frame rate, which is an irreversible development trend for existing camera modules.

[0003] Motors are essential components of high-pixel camera modules. During operation, they drive the lens in various directions to achieve optical autofocus (AF) and optical image stabilization (OIS). AF uses a motor to linearly move the lens carrier along the optical axis, focusing on the subject and producing a clear image on the image sensor (CMOS, CCD, etc.) located behind the lens. OIS improves image clarity by adaptively moving the lens carrier in a direction that compensates for vibration caused by vibration.

[0004] As the imaging quality requirements of mobile phone camera modules become higher and higher, the size and weight of lenses are getting larger and larger, and the driving force requirements for motors are also getting higher and higher. However, current electronic devices (such as mobile phones) have great restrictions on the size of camera modules, and the volume occupied by the motor increases accordingly with the increase of the lens. In other words, as the lens develops towards larger size and heavier weight, the driving force that the motor can provide is difficult to increase accordingly. Under the premise of limited driving force, the heavier the lens, the shorter the stroke that the motor can drive the lens to move, affecting the focusing and anti-shake capabilities. In order to achieve better light focusing and optical image stabilization functions, a larger stroke of movement is usually required.

[0005] On the other hand, the increased weight of the lens slows the motor's movement, and the longer it takes for the lens to reach the predetermined compensation position, the more it affects focus and image stabilization, resulting in unclear images. Increasing the motor's driving force requires increasing its size, complicating the motor mechanism, increasing the number of parts, and increasing the thickness of the device. Summary of the Invention

[0006] One object of the present invention is to provide a lens driving device and a camera module with a simple structure, which can ensure the miniaturization of the camera module while realizing the AF function of the lens in the optical axis direction and the OIS function of the optical axis orthogonal plane.

[0007] Another object of the present invention is to provide a lens driving device and a camera module, which facilitate obtaining a larger anti-shake stroke and focusing stroke by setting the optical image stabilization and autofocus separately, which is beneficial to compensate for the larger shake of the camera module without increasing the motor volume, thereby ensuring the miniaturization of the camera module.

[0008] Another object of the present invention is to provide a lens driving device and a camera module, which facilitate maintaining the stability of the movable carrier in the camera module and the centering effect through the magnetic attraction force generated along the optical axis between the magnetic attraction component and the magnet, and effectively prevent the movable carrier from falling off due to shaking or inversion of the camera module.

[0009] Another object of the present invention is to provide a lens driving device and a camera module, which ensure displacement accuracy through a supporting mechanism and a guide groove, reduce friction, and facilitate increasing the anti-shake stroke of the camera module.

[0010] To achieve the above objectives, the technical solution adopted by the present invention is: a lens driving device includes a movable carrier, a fixed base, a driving mechanism, a guide groove, a supporting mechanism and a magnetic attraction component, the movable carrier is used to accommodate the lens assembly, the fixed base and the movable carrier are arranged opposite to each other at intervals along the optical axis direction, the driving mechanism is located on the circumferential side of the movable carrier, the driving mechanism includes at least one group of coils and at least one group of magnets, the guide groove is arranged between the fixed base and the movable carrier, the supporting mechanism is movably arranged in the guide groove, the magnetic attraction component is installed on the fixed base and arranged opposite to the magnet, so that a magnetic attraction force along the optical axis direction is generated between the magnetic attraction component and the magnet.

[0011] Preferably, the at least one group of coils includes at least one first coil and at least one second coil, and the magnets are respectively arranged to be separated from the first coil and the second coil. The first coil and the magnet form a first magnetic field loop, which can drive the movable carrier to move along the optical axis direction for automatic focusing. The second coil and the magnet form a second magnetic field loop, which can drive the movable carrier to move relative to the fixed base along the orthogonal plane direction of the optical axis for jitter correction.

[0012] Preferably, the movable carrier includes a first carrier and a second carrier, the first carrier can be movably built into the second carrier, the lens assembly is accommodated in the first carrier, the first coil is arranged on the outer periphery of the first carrier, the magnet is fixed around the second carrier, the magnet and the first coil are arranged radially relative to each other, and the magnet and the second coil are arranged axially relative to each other, and the second coil is placed on the fixed base.

[0013] As a preference, the magnetic attraction member is located on the back side of the second coil, and the magnetic attraction member and the second coil are fixed around the fixed base in a relative axial arrangement.

[0014] As a preference, the guide groove includes a plurality of tracks, which are respectively opened on the opposite surfaces of the fixed base and the second carrier, and each of the supporting mechanisms is accommodated in each of the tracks, so that the supporting mechanism can rollingly support the radial displacement of the second carrier along the orthogonal plane of the optical axis.

[0015] Preferably, the guide groove is provided with a first track and a second track, the first track and the second track are in a cross structure, the tracks are respectively located at the intervals between the adjacent second coils, the first track is opened on the upper surface of the fixed base along the X direction or the Y direction, and the second track is opened on the lower surface of the second carrier relatively along the Y direction or the X direction, so that the ball can move in the first track or the second track.

[0016] As a preference, the number of the supporting mechanisms is at least 3, the number of the guide grooves is at least 3 pairs, and the supporting mechanisms are balls.

[0017] Preferably, the number of the guide grooves and the number of the support mechanisms are four respectively, the guide grooves are respectively recessed at the four relative corners of the fixed base and the second carrier, and the support mechanisms are rollably supported at the four corners of the second carrier.

[0018] As a preference, the cross-sectional structure of the first track and the second track is U-shaped, V-shaped or trapezoidal.

[0019] Preferably, the second carrier is provided with a accommodating cavity, a first opening and a second opening, the accommodating cavity is located around the second carrier, the first opening is opened on the radial inner side of the accommodating cavity, the second opening is opened on the axial lower side of the accommodating cavity, and the magnet is fixed in the accommodating cavity.

[0020] Preferably, the movable carrier further includes an elastic support member, which elastically connects the first carrier and the second carrier, and the elastic support member is capable of supporting the first carrier to move relative to the second carrier along the optical axis for focusing. The elastic support member includes an upper spring plate, a lower spring plate and at least one pair of extensions. The upper spring plate can movably connect the upper surfaces of the first carrier and the second carrier, and the lower spring plate can movably connect the lower surfaces of the first carrier and the second carrier. The extension portion can electrically connect the second carrier and the elastic support member, so that the first coil is electrically connected to the second carrier.

[0021] Preferably, there are two or four extension parts, and the extension parts are respectively fixed at the corners of the second carrier. Each extension part includes a first fixed end, a second fixed end and a suspension wire, and the suspension wire is bent to connect the first fixed end and the second fixed end, and the first fixed end is fixed to the second carrier.

[0022] As a preference, the extension portion includes a pair of conductive extension portions and a pair of reset extension portions, the conductive extension portions are used to electrically conduct the first coil and the second carrier, the conductive extension portions are respectively located at a pair of same-side corners of the second carrier, and the reset extension portions are respectively located at another pair of same-side corners of the second carrier, the second fixed end of the conductive extension portion is fixedly connected to the upper spring sheet or the lower spring sheet; the second fixed end of the reset extension portion is fixedly connected to the extension column of the fixed base, and the reset extension portion is used to reset the second carrier when it moves along a plane orthogonal to the optical axis.

[0023] As a preference, an axial spacing is formed between the second coil and the magnet, and the axial spacing is 0.05-0.5 mm. Preferably, the axial spacing is 0.1-0.3 mm. Preferably, the axial spacing is 0.1 mm.

[0024] As a preference, the magnetic attraction member and the guide groove are arranged in sequence and spaced apart on a plane orthogonal to the optical axis.

[0025] Preferably, the magnetic attraction member is an iron sheet, the number of the magnets is 4, the number of the second coils and the magnetic attraction members is consistent with the number of the magnets, and the magnets are arranged along the four peripheries of the second carrier.

[0026] Preferably, the driving mechanism can drive the first carrier to a travel range of ±250 μm along the optical axis, and the driving mechanism can drive the second carrier to a travel range of ±150 μm along a plane perpendicular to the optical axis.

[0027] A camera module includes the above-mentioned lens driving device, a lens assembly and a photosensitive assembly, wherein the lens assembly is equipped with at least one lens, and the fixed base is arranged between the photosensitive assembly and the lens assembly, so that the photosensitive assembly can sense light and form an image. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a structural diagram of a camera module according to an embodiment of the present application;

[0029] Figure 2 is an exploded view of a camera module according to an embodiment of the present application;

[0030] Figure 3 is a structural schematic diagram of a lens driving device according to an embodiment of the present application;

[0031] Figure 4 is a schematic cross-sectional view of a lens driving device according to an embodiment of the present application;

[0032] Figure 5 is a structural schematic diagram of a fixed base and a supporting mechanism according to an embodiment of the present application;

[0033] Figure 6 It is a structural schematic diagram of the movable carrier and the supporting mechanism according to the embodiment of the present application.

[0034] Reference numerals in the figure: 1, lens assembly; 2, lens driving device; 10, fixed base; 20, movable carrier; 21, first carrier; 22, second carrier; 221, accommodating cavity; 222, first opening; 223, second opening; 23, elastic support member; 231, upper spring plate; 232, lower spring plate; 233, extension portion; 233a, conductive extension portion; 233b, reset extension portion; 234a, upper inner profile; 235a , upper outer profile; 236a, upper elastic part; 234a, lower inner profile; 235a, lower outer profile; 236a, lower elastic part; 237, first fixed end; 238, second fixed end; 239, suspension wire; 30, driving mechanism; 31, first coil; 32, second coil; 33, magnet; 41, guide groove; 411, first track; 412, second track; 42, supporting mechanism; 43, magnetic attraction component; 50, shell. DETAILED DESCRIPTION

[0035] The present invention will be further described below in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0036] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0037] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0038] The terms "comprises" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0039] It should be noted that, as used in this application, the terms "substantially," "approximately," and similar terms are used as terms of approximation, not as terms of degree, and are intended to account for inherent deviations in measurements or calculations that would be recognized by a person of ordinary skill in the art.

[0040] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct, contact, or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0041] According to a first aspect of the present application, a lens driving device 2 is provided, such as Figures 1 to 6As shown, the lens driving device 2 includes a movable carrier 20, a fixed base 10, a driving mechanism 30, a guide groove 41, a supporting mechanism 42 and a magnetic attraction component 43. The movable carrier 20 is used to accommodate the lens assembly 1. The fixed base 10 and the movable carrier 20 are arranged opposite to each other at intervals along the optical axis direction. The driving mechanism 30 is located on the peripheral side of the movable carrier 20. The driving mechanism 30 includes at least one group of coils and at least one group of magnets 33. The guide groove 41 is arranged between the fixed base 10 and the movable carrier 20. The supporting mechanism 42 is movably arranged in the guide groove 41. The magnetic attraction component 43 is installed on the fixed base 10 and is arranged opposite to the magnet 33, so that a magnetic attraction force along the optical axis direction is generated between the magnetic attraction component 43 and the magnet 33. Thus, the supporting mechanism 42 is able to support the relative movement between the fixed base 10 and the movable carrier 20 along the guide groove 41, thereby providing support and guidance for the movable carrier 20, improving the displacement accuracy and anti-shake stroke. At the same time, the magnetic attraction component 43 and the magnet 33 are arranged opposite to each other along the optical axis, so that a magnetic attraction force along the optical axis is generated between the magnetic attraction component 43 and the magnet 33, which is convenient for maintaining the stability of the movable carrier 20 carrying the magnet 33 in the camera module, keeping the movable carrier 20 centered, and effectively preventing the movable carrier 20 from falling off due to the shaking or inversion of the camera module.

[0042] Among them, the magnetic attraction component 43 and the magnet 33 are arranged opposite to each other along the optical axis, and generate a magnetic attraction force along the optical axis. Since the magnetic attraction component 43 and the magnet 33 are not completely aligned, when the movable carrier 20 moves along the plane orthogonal to the optical axis, an offset will occur between the magnet 33 and the magnetic attraction component 43, but the plane where the magnet 33 is located and the plane where the magnetic attraction component 43 is located always remain parallel. At the same time, the plane where the magnet 33 is located and the plane where the magnetic attraction component 43 is located are respectively orthogonal to the optical axis. Therefore, "the magnetic attraction force generated between the magnetic attraction component 43 and the magnet 33 along the optical axis" refers to the magnetic attraction force generated between the plane where the magnet 33 is located and the plane where the magnetic attraction component 43 is located, including but not limited to the vertical magnetic attraction force and the inclined magnetic attraction force deviating from the vertical direction.

[0043] In some embodiments, the lens driving device 2 further includes a shell 50, which covers the movable carrier 20 from the front, and the fixed base 10 covers the rear of the movable carrier 20, wherein the front refers to the positive direction side of the Z axis, and the rear refers to the negative direction side of the Z axis, and the movable carrier 20 and the supporting mechanism 42 are arranged in the accommodating cavity formed by the shell 50 and the fixed base 10.

[0044] In this embodiment, an orthogonal coordinate system (X, Y, Z) is used for description. The Z direction is the direction of the optical axis and is the front-to-back direction. The X direction and the Y direction that are orthogonal to the Z axis are used as directions orthogonal to the optical axis. The X direction is the up-down direction (or the left-right direction), and the Y direction is the left-right direction (or the up-down direction). The plane orthogonal to the optical axis is the plane formed by the X direction and the Y direction. The "radial direction" is the direction orthogonal to the Z axis, and the "axial direction" refers to the opposing arrangement between two Z-axis orthogonal planes, including not only the direction parallel to the Z axis but also the direction close to being parallel to the Z axis.

[0045] In some embodiments, the at least one group of coils includes at least one first coil 31 and at least one second coil 32, and the magnet 33 is respectively arranged to be separated from the first coil 31 and the second coil 32. The first coil 31 and the magnet 33 form a first magnetic field loop, which can drive the movable carrier 20 to move along the optical axis for automatic focusing. The second coil 32 and the magnet 33 form a second magnetic field loop, which can drive the movable carrier 20 to move relative to the fixed base 10 along the orthogonal plane direction of the optical axis for jitter correction.

[0046] The movable carrier 20 includes a first carrier 21 and a second carrier 22. The first carrier 21 is movably embedded in the second carrier 22. The lens assembly 1 is accommodated in the first carrier 21. The first coil 31 is disposed on the outer periphery of the first carrier 21. The magnet 33 is fixed around the second carrier 22. The magnet 33 and the first coil 31 are disposed radially relative to each other, and the magnet 33 and the second coil 32 are disposed axially relative to each other. The second coil 32 is mounted on the fixed base 10. The magnet 33 and the first coil 31 are disposed radially relative to each other, meaning that the magnet 33 and the first coil 31 are disposed opposite each other in the X direction or the Y direction, and the magnet 33 and the second coil 32 are disposed axially relative to each other, meaning that the magnet 33 and the second coil 32 are disposed opposite each other in the Z direction.

[0047] If the first coil 31 is energized, the first magnetic field loop is formed based on the interaction between the magnetic field generated by the magnet 33 and the current flowing in the first coil 31, generating a Lorentz force, driving the first carrier 21 carrying the first coil 31 to move in the Z direction, thereby driving the lens assembly 1 to move in the Z direction to achieve autofocus. The direction of the Lorentz force is in a direction (Z direction) that is orthogonal to the direction of the magnetic field (X direction or Y direction) and the direction of the current in the first coil 31 (Y direction or X direction).

[0048] If the second coil 32 is energized, a Lorentz force is generated based on the interaction between the magnetic field of the magnet 33 and the current flowing through the second coil 32, driving the second carrier 22 with the magnet 33 to move in the X direction or the Y direction, thereby driving the first carrier 21 and the lens assembly 1 to move in the X direction or the Y direction, thereby achieving OIS (Optical Image Stabilization) correction. The direction of the Lorentz force in the second magnetic field loop is in a direction (Y direction or X direction) that is orthogonal to the direction of the magnetic field (Z direction) and the direction of the current (X direction or Y direction).

[0049] In some embodiments, the magnetic member 43 is located on the back side of the second coil 32, and the magnetic member 43 and the second coil 32 are fixed to the periphery of the fixed base 10 in an axially opposed arrangement. That is, the magnetic member 43 and the second coil 32 overlap. The magnetic member 43 can be built into the fixed base 10, such as when the magnetic member 43 is completely covered by the fixed base 10 and the second coil 32 is fixed to the surface of the fixed base 10, to avoid increasing the height of the lens driving device 2. The magnetic member 43 can also be embedded in the fixed base 10, such as when the magnetic member 43 is partially embedded in the fixed base 10, with the front side of the magnetic member 43 protruding from the surface of the fixed base 10 and the second coil 32 superimposed on the front side of the magnetic member 43. The magnetic member 43 can also be placed flat on the surface of the fixed base 10, with the second coil 32 superimposed on the front side of the magnetic member 43. The magnetic member 43 and the second coil 32 are both arranged opposite the magnet 33. The number of the magnetic attraction components 43 is the same as the number of the magnets 33 , which is at least 3.

[0050] The magnetic member 43 is arranged opposite the magnet 33 in the Z direction, rather than in the X or Y direction (e.g., by placing the magnetic member 43 on the side wall of the housing 50). When the magnetic member 43 is placed on the side wall of the housing 50, it generates an X or Y magnetic attraction force on the magnet 33. As the OIS stroke increases, the distance between the magnet 33 and the magnetic member 43 increases, weakening the magnetic attraction force and making resetting difficult. Compared to placing the magnetic member 43 opposite the magnet in the X or Y direction, placing the magnetic member 43 opposite the magnet 33 in the Z direction facilitates generating a Z-direction attraction force on the magnet 33. As the required stroke of the magnet 33 in the plane orthogonal to the optical axis increases, the distance between the magnetic member 43 and the magnet 33 is not affected by the OIS stroke, thereby facilitating a larger OIS stroke and facilitating rapid resetting.

[0051] In some embodiments, the magnetic member 43 is made of a material capable of mutual attraction with the magnet 33 and generating magnetic attraction, such as an iron sheet. The magnetic attraction between the iron sheet and the magnet 33 enables frictional contact between the second carrier 22 and the movable base 10 via the support mechanism 42, thereby maintaining the stability of the second carrier 22 in the camera module and ensuring that the second carrier 22 remains centered and does not fall off due to shaking or inversion of the camera module. At the same time, after optical image stabilization, the movable carrier 20 is quickly restored to its initial position through the magnetic attraction between the magnetic member 43 and the magnet 33. The initial position is the position of the movable carrier 20 before optical image stabilization.

[0052] In some embodiments, the guide slot 41 includes multiple tracks, each of which is provided on opposing surfaces of the fixed base 10 and the second carrier 22. Each of the support mechanisms 42 is housed within a respective track, enabling the support mechanism 42 to rollably support the radial displacement of the second carrier 22 along a plane orthogonal to the optical axis. Thus, by providing the tracks between the fixed base 10 and the second carrier 22 and housing the support mechanism 42 within the tracks, the support mechanism 42 maintains dynamic support for the second carrier 22 as the second carrier 22 moves relative to the fixed base 10 in the X and / or Y directions during optical image stabilization, ensuring smooth sliding of the second carrier 22 and ensuring displacement accuracy.

[0053] In some embodiments, the guide groove 41 is provided with a first track 411 and a second track 412, the first track 411 and the second track 412 are in a cross structure, the tracks are respectively located at the intervals between the adjacent second coils 32, the first track 411 is opened on the upper surface of the fixed base 10 along the X direction or the Y direction, and the second track 412 is opened on the lower surface of the second carrier 22 along the Y direction or the X direction relative to the first track 411, so that the support mechanism 43 can move between the first track 411 and the second track 412, and the support mechanism 42 is a ball, such as Figure 5 and Figure 6 As shown. Thus, by arranging the first track 411 and the second track 412 in different directions, the motion trajectory of the support mechanism 43 is confined within the tracks, helping to guide the second carrier 22 during movement. At the same time, the balls allow rolling friction to replace sliding friction, further reducing the friction between the second carrier 22 and the fixed base 10. This effectively improves the stability of the second carrier 22 during autofocus and optical image stabilization, thereby enhancing imaging quality.

[0054] The upper surface of the fixed base 10 and the lower surface of the second carrier 22 are along the optical axis, and the direction from the fixed base 10 to the second carrier 22 is from bottom to top.

[0055] In some embodiments, the number of the supporting mechanisms 42 is at least three, the number of the guide grooves 41 is at least three pairs, the number of the magnets 33 is at least three, and a ball is disposed in each of the guide grooves 41 .

[0056] There are four guide grooves 41 and four supporting mechanisms 42 respectively. The magnetic members 43 and the guide grooves 41 are arranged in sequence and spaced apart on the plane orthogonal to the optical axis. The guide grooves 41 can be positioned at the diagonal sides along the plane orthogonal to the optical axis, and the magnetic members 43 can be arranged on the four sides of the fixed base 10. Alternatively, the guide grooves 41 can be positioned at the four sides along the plane orthogonal to the optical axis, and the magnetic members 43 can be arranged at the four corners of the fixed base 10.

[0057] In some embodiments, the guide grooves 41 are respectively recessed at the four opposing corners of the fixed base 10 and the second carrier 22, and the support mechanisms 42 are rollably supported at the four opposing corners of the second carrier 22 and the fixed base 10, thereby helping to maintain the stability of the second carrier 22. Furthermore, placing the guide grooves 41 and the support mechanisms 42 at the four opposing corners of the fixed base 10 and the second carrier 22 can fully utilize the free space between the fixed base 10 and the second carrier 22, thereby providing a larger space for the guide grooves 41 and giving them a longer longitudinal dimension. This allows the guide grooves 41 and the support mechanisms 42 to provide a greater travel range for the second carrier 22 when guiding the second carrier 22, thereby facilitating optical image stabilization with a greater travel range.

[0058] Among them, for the guide groove 41 opened in the X direction, the length along the X direction is greater than the diameter of the support mechanism 42, and the size along the Y direction is equal to or slightly greater than the diameter of the support mechanism 42, ensuring the movement of the support mechanism 42 along the X direction; for the guide groove 41 opened in the Y direction, the length along the Y direction is greater than the diameter of the support mechanism 42, and the size along the X direction is equal to or slightly greater than the diameter of the support mechanism 42, ensuring the movement of the support mechanism 42 along the Y direction.

[0059] The transverse dimension of the guide groove 41 is equal to the diameter of the support mechanism 42 , and the longitudinal dimension of the guide groove 41 is greater than the diameter of the support mechanism 42 .

[0060] In some embodiments, the number of the magnets 33 is 4, the number of the second coils 32 and the magnetic components 43 is consistent with the number of the magnets 33, the magnets 33 are arranged along the four peripheries of the second carrier 22, the magnets 33 and the magnetic components 43 are arranged opposite to each other, the magnetic components 43 are arranged on the upper surface of the fixed base 10 and are located on the four sides of the fixed base 10, the second coil 32 is superimposed on the magnetic component 43, and a magnetic attraction force is generated between the second carrier 22 and the fixed base 10 through the magnetic component 43 and the magnet 33, the magnets 33 are located on the four sides of the second carrier 22, and since the space on the four sides of the second carrier 22 is larger, it can be suitable for accommodating magnets 33 of larger sizes, thereby providing a greater driving force.

[0061] In some embodiments, the cross-sectional structures of the first rail 411 and the second rail 412 are U-shaped, V-shaped, or trapezoidal.

[0062] In some embodiments, the second coil 32 is disposed on four sides of the fixed base 10 and is disposed opposite the magnet 33. An axial spacing is formed between the second coil 32 and the magnet 33. The axial spacing is 0.05 to 0.5 mm, preferably 0.1 to 0.3 mm, and preferably 0.1 mm. This prevents the magnet 33 from contacting the second coil 32 and causing interference, and allows for good magnetic induction.

[0063] In some embodiments, the first coil 31 is attached to the outer wall of the first carrier 21, and the magnet 33 is a dual-purpose magnet, that is, a common magnet for the first coil 31 and the second coil 32. When performing autofocus, the first coil 31 is energized to generate electromagnetic induction with the magnet 33, so as to drive the first coil 31 and then drive the first carrier 21 to move along the optical axis to achieve AF of the lens. Since only the first carrier 21 and the lens assembly 1 therein need to be driven to move, relatively speaking, only a smaller driving force is required to achieve AF during this process, thereby reducing power consumption. When performing optical image stabilization, the second coil 32 is energized to generate electromagnetic induction with the magnet 33, so as to drive the magnet 33 to drive the second carrier 22 and then the first carrier 21 to move, so that the movable carrier 20 as a whole moves along the plane orthogonal to the optical axis. The four groups of second coils 32 and the magnet 33 interact with each other to generate a greater driving force. In the present application, the AF stroke and the OIS stroke are controlled separately to avoid interference between AF and OIS, reduce the burden on their respective components, and do not need to move the movable carrier 20 as a whole during autofocus. When the volume and driving force of the magnet 33 are constant, the AF stroke is effectively increased.

[0064] Each magnet 33 includes four magnetic poles, with an N pole and an S pole adjacent to each other. Since the magnets 33 are dual-purpose magnets, the number of components can be reduced, simplifying the structure of the lens drive device 2. Another position sensing device, such as an IC or a Hall effect device, can be disposed within the second coil 32 and positioned opposite the magnet 33 to detect the position of the magnet 33.

[0065] In some embodiments, the second carrier 22 is provided with a receiving cavity 221, a first opening 222, and a second opening 223. The receiving cavity 221 is located around the second carrier 22, the first opening 222 is opened on the radially inner side of the receiving cavity 221, and the second opening 223 is opened on the axially lower side of the receiving cavity 221. The magnet 33 is fixed in the receiving cavity 221. The receiving cavity 221 is located on the four sides of the second carrier 22, and the receiving cavity 221 is an open cavity. The magnet 33 is fixed in the receiving cavity 221 by being inverted. The magnet 33 is arranged opposite to the first coil 21 in the air, and the magnet 33 is arranged opposite to the second coil 32 in the air.

[0066] In some embodiments, the movable carrier 20 further includes an elastic support member 23, which elastically connects the first carrier 21 and the second carrier 22. The elastic support member 23 is capable of supporting the first carrier 21 to move relative to the second carrier 22 along the optical axis for focusing. The elastic support member 23 includes an upper spring plate 231, a lower spring plate 232, and at least a pair of extensions 233. The upper spring plate 231 is movably connected to the upper surface of the first carrier 21 and the second carrier 22, and the lower spring plate 232 is movably connected to the lower surface of the first carrier 21 and the second carrier 22. The extensions 233 are capable of electrically connecting the second carrier 22 and the elastic support member 23, so that the first coil 31 is electrically connected to the second carrier 22. The upper spring plate 231 and the lower spring plate 232 can also be fixed to the side walls of the second carrier 22 respectively, which is not limited in this application. The elastic support member 23 thus centers the first carrier 21. The elastic support member 23 maintains the first carrier 21 within the second carrier 22 through elastic force. Simultaneously, the elastic support member 23 uses elastic force to pull the first carrier 21 back to its initial position. The initial position refers to the position of the first carrier 21 before displacement along the optical axis AF. The upper surface and lower surface are the first carrier 21 and the second carrier 22, respectively, along the optical axis. The upper surface is in front of the optical axis, and the lower surface is relatively rearward of the optical axis.

[0067] In some embodiments, the upper spring piece 231 includes an upper inner profile 234a, an upper outer profile 235a, and an upper elastic portion 236a. The upper elastic portion 236a elastically connects the upper inner profile 234a and the upper outer profile 235a, allowing the upper inner profile 234a and the upper outer profile 235a to move relative to each other along the Z direction. The upper inner profile 234a is fixed to the upper surface of the first carrier 21, and the upper outer profile 235a is fixed to the upper surface of the second carrier 22, so that the upper spring piece 231a can be movably connected to the upper surface of the first carrier 21 and the upper surface of the second carrier 22. The fixing method is not limited and can be fixed by interlocking or bonding. The upper elastic portion 236a has a serpentine structure to facilitate the elastic connection between the upper inner profile 234a and the upper outer profile 235a.

[0068] In some embodiments, the lower elastic piece 232 has a similar structure to the upper elastic piece 231. The lower elastic piece 231 includes a lower inner profile 234b, a lower outer profile 235b, and a lower elastic portion 236b. The lower elastic portion 236b elastically connects the lower inner profile 234b and the lower outer profile 235b, allowing the lower inner profile 234b and the lower outer profile 235b to move relative to each other along the Z direction. The lower inner profile 234b is fixed to the lower surface of the first carrier 21, and the lower outer profile 235b is fixed to the lower surface of the second carrier 22, allowing the lower elastic piece 231b to movably connect the lower surface of the first carrier 21 and the lower surface of the second carrier 22. The fixing method is not limited and can be fixed by interlocking or bonding. The lower elastic portion 236 has a serpentine structure to facilitate the elastic connection between the lower inner profile 234b and the lower outer profile 235b.

[0069] In some embodiments, each of the extension portions 233 includes a first fixed end 237, a second fixed end 238 and a suspension wire 239, wherein the suspension wire 239 is curved to connect the first fixed end 237 and the second fixed end 238, the first fixed end 237 is attached to the periphery of the second carrier 22 and can be electrically connected to the second carrier 22, and the second fixed end 238 is electrically connected to the upper spring piece 231 and / or the lower spring piece 232, so that the first coil 31 and the second carrier 22 are electrically connected through the upper spring piece 231 and / or the lower spring piece 232.

[0070] In some embodiments, the number of extensions 233 can be two or four. When there are two extensions 233, the extensions 233 provide electrical continuity. When there are four extensions 233, one pair of the extensions 233 provides electrical continuity, while the other pair of extensions 233, through their elastic force, resets the lens assembly 1. Furthermore, the extensions 233 are fixed to the four corners of the second carrier 22, with one pair of the extensions 233 integrally connected to both sides of the upper spring plate 231, thereby providing electrical continuity between the first coil 31 and the second carrier 22. Thus, the electrical connection between the first coil 31 and the second carrier 22 is achieved through the circuit conduction between the extension portion 233 and the second carrier 22. The extension portion 233 can be an integral structure or a separate structure with the upper spring piece 231 or the lower spring piece 232. The upper spring piece 231 can be an integral structure or a separate structure, and the lower spring piece 232 can be an integral structure or a separate structure. The second coil 32 can be electrically connected to the second carrier 2 upward through a wire or a pin to achieve an electrical connection between the second coil 32 and the second carrier 22. In other words, the second carrier 22 integrates a conductive function, electrically connecting both the first coil 31 and the second coil 32 to the second carrier 22, and conducting to the outside of the lens driving device 2 through the second carrier 22, thereby simplifying the electrical connection structure of the lens driving device 2.

[0071] In some embodiments, one pair of the extensions 233 is disposed at a pair of adjacent corners of the second carrier 22 to electrically connect the first coil 31 and the second carrier 22, the first fixed end 237 and the second fixed end 238 are attached to the outer periphery of the second carrier 22, and the second fixed end 238 is fixed to the upper spring piece 231 or the lower spring piece 232; another pair of the extensions 233 is disposed at another pair of adjacent corners of the second carrier 22, the first fixed end 237 is fixed to the second carrier 22, and the second fixed end 238 is fixed to the fixed base. 10, the second fixed end 238 is not connected to the upper spring plate 231 or the lower spring plate 232, and the other pair of extension portions 233 are non-conductive, and provide a certain restoring force for the lens assembly 1 during OIS through their elastic force. Preferably, the fixed base 10 has at least two extension columns extending upward from the corners of the fixed base 10, so that the second fixed end 238 is fixedly connected to the extension columns, and the elastic force of the extension portions 233 can pull the second carrier 22 back to the initial position, wherein the initial position refers to the position of the second carrier 22 before the OIS displacement is performed.

[0072] That is, the extension portion 233 includes a pair of conductive extension portions 233a and a pair of reset extension portions 233b. The conductive extension portions 233a are used to electrically connect the first coil 31 and the second carrier 22. The conductive extension portions 233a are respectively located at a pair of same-side corners of the second carrier 22, and the reset extension portions 233b are respectively located at another pair of same-side corners of the second carrier 22. The first fixed end 237 of the conductive extension portion 233a is fixed to the second carrier 22, and the second fixed end 237 of the conductive extension portion 233a is fixed to the second carrier 22. 38 is fixed to the upper spring piece 231 or the lower spring piece 232; the first fixed end 237 of the reset extension part 233b is fixed to the second carrier 22, and the second fixed end 238 of the reset extension part 233b is fixed to the extension column of the fixed base 10. The reset extension part 233b is used to reset the second carrier 22 when it moves along the plane orthogonal to the optical axis. The second carrier 22 is pulled back to the initial position by the elastic force of the reset extension part 233b. The initial position refers to the position of the second carrier 22 before OIS displacement.

[0073] In some embodiments, the circuit is integrally formed on the second carrier 22 by using an insert molding process, and is then connected from the second carrier 22 to the outside of the lens driving device 2 to facilitate circuit conduction.

[0074] In some embodiments, a circuit layer is provided on the surface of the second carrier 22 , and the second carrier 22 is connected to the outside of the lens driving device 2 to facilitate circuit conduction.

[0075] In some embodiments, the driving mechanism 30 can drive the first carrier 21 to a travel range of ±250 μm along the optical axis, and the driving mechanism 30 can drive the second carrier 22 to a travel range of ±150 μm along the plane perpendicular to the optical axis.

[0076] According to the second aspect of the present application, a camera module is provided, comprising the above-mentioned lens driving device 2, a lens assembly 1 and a photosensitive assembly, wherein the lens assembly 1 is equipped with at least one lens; the fixed base 10 is arranged between the photosensitive assembly and the lens assembly 1, and the photosensitive assembly is able to sense light and form an image.

[0077] In some embodiments, the lens assembly 1 includes a lens barrel and a plurality of lenses arranged along the optical axis. The lens barrel can be fixed to the first carrier 21 by gluing or snapping, or the lens assembly 1 and the first carrier 21 can be set as an integral structure, that is, the first carrier 21 replaces the lens barrel and is used to accommodate the lenses in the lens assembly 1. When the first carrier 21 moves along the optical axis, it can drive the lens assembly 1 to move to realize the AF function. Compared with the conventional motor structure in which the lens barrel is fixed to the first carrier 21, the integrated structure can reduce the size of the lens barrel, reduce the gap between the conventional lens barrel and the first carrier 21, and help to further reduce the size of the camera module.

[0078] The above describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and description merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A lens driving device, characterized in that: include: A movable carrier, the movable carrier being used to accommodate the lens assembly; A fixed base, wherein the fixed base and the movable carrier are arranged opposite to each other at intervals along the optical axis direction; a driving mechanism, the driving mechanism being located on a circumferential side of the movable carrier, the driving mechanism comprising at least one set of coils and at least one set of magnets, the at least one set of coils including at least one second coil, the at least one second coil and the magnet forming a second magnetic field loop, thereby driving the movable carrier to move in a direction perpendicular to the optical axis; a guide groove, the guide groove being provided between the fixed base and the movable carrier; a supporting mechanism, the supporting mechanism being movably disposed in the guide groove; A magnetic component is installed on the fixed base and is arranged opposite to the magnet along the optical axis, so as to generate a magnetic attraction force along the optical axis between the magnetic component and the magnet. The magnetic component is located on the back side of the at least one second coil, and the magnetic component overlaps with the at least one second coil along the optical axis. The magnetic component and the at least one second coil are both arranged opposite to the magnet along the optical axis.

2. The lens driving device according to claim 1, wherein: The at least one group of coils includes at least one first coil, and the magnet is respectively arranged to be spaced apart from the first coil and the second coil. The first coil and the magnet form a first magnetic field loop, which can drive the movable carrier to move along the optical axis to perform automatic focusing.

3. The lens driving device according to claim 2, wherein: The movable carrier includes a first carrier and a second carrier, the first carrier can be movably built into the second carrier, the lens assembly is accommodated in the first carrier, the first coil is arranged on the outer periphery of the first carrier, the magnet is fixed around the second carrier, the magnet and the first coil are arranged radially relative to each other, and the magnet and the second coil are arranged opposite to each other along the optical axis direction, and the second coil is placed on the fixed base.

4. The lens driving device according to claim 3, wherein: The magnetic attraction component and the second coil are arranged opposite to each other along the optical axis and fixed on the four sides of the fixed base.

5. The lens driving device according to claim 3, wherein: The guide groove includes a plurality of tracks, which are respectively opened on the opposite surfaces of the fixed base and the second carrier. Each of the support mechanisms is accommodated in each of the tracks, so that the support mechanism can rollably support the radial displacement of the second carrier along the orthogonal plane of the optical axis.

6. The lens driving device according to claim 5, wherein: The guide groove is provided with a first track and a second track, the first track and the second track are in a cross structure, the tracks are respectively located at the intervals between adjacent second coils, the first track is opened on the upper surface of the fixed base along the X direction or the Y direction, and the second track is opened on the lower surface of the second carrier relatively along the Y direction or the X direction, so that the supporting mechanism can move within the first track or the second track.

7. The lens driving device according to claim 6, wherein: The number of the supporting mechanisms is at least 3, the number of the guide grooves is at least 3 pairs, and the supporting mechanisms are balls.

8. The lens driving device according to claim 7, wherein: There are four guide grooves and four supporting mechanisms respectively. The guide grooves are respectively formed in a concave manner at four opposite corners of the fixed base and the second carrier. The supporting mechanisms are rollably supported at the four corners of the second carrier.

9. The lens driving device according to claim 7, wherein: The cross-sectional structures of the first track and the second track are U-shaped, V-shaped or trapezoidal.

10. The lens driving device according to claim 3, wherein: The second carrier is provided with a accommodating cavity, a first opening and a second opening. The accommodating cavity is located around the second carrier, the first opening is opened on the radial inner side of the accommodating cavity, and the second opening is opened on the axial lower side of the accommodating cavity. The magnet is fixed in the accommodating cavity.

11. The lens driving device according to claim 3, wherein: The movable carrier further includes an elastic support member, which elastically connects the first carrier and the second carrier, and the elastic support member is capable of supporting the first carrier to move relative to the second carrier along the optical axis for focusing. The elastic support member includes an upper spring plate, a lower spring plate and at least a pair of extensions. The upper spring plate can movably connect the upper surfaces of the first carrier and the second carrier, and the lower spring plate can movably connect the lower surfaces of the first carrier and the second carrier. The extensions can electrically connect the second carrier and the elastic support member, so that the first coil is electrically connected to the second carrier.

12. The lens driving device according to claim 11, wherein: There are two or four extension parts, and the extension parts are respectively fixed at the corners of the second carrier. Each extension part includes a first fixed end, a second fixed end and a suspension wire. The suspension wire is bent to connect the first fixed end and the second fixed end. The first fixed end is fixed to the second carrier.

13. The lens driving device according to claim 12, wherein: The extension portion includes a pair of conductive extension portions and a pair of reset extension portions. The conductive extension portions are used to electrically connect the first coil and the second carrier. The conductive extension portions are respectively located at a pair of same-side corners of the second carrier, and the reset extension portions are respectively located at another pair of same-side corners of the second carrier. The second fixed end of the conductive extension portion is fixedly connected to the upper spring sheet or the lower spring sheet; the second fixed end of the reset extension portion is fixedly connected to the extension column of the fixed base, and the reset extension portion is used to reset the second carrier when it moves along a plane orthogonal to the optical axis.

14. The lens driving device according to any one of claims 3 to 13, wherein: An axial distance is formed between the second coil and the magnet, and the axial distance is 0.05-0.5 mm.

15. The lens driving device according to any one of claims 3 to 13, wherein: An axial distance is formed between the second coil and the magnet, and the axial distance is 0.1-0.3 mm.

16. The lens driving device according to any one of claims 3 to 13, wherein: An axial distance is formed between the second coil and the magnet, and the axial distance is 0.1 mm.

17. The lens driving device according to claim 14, wherein: The magnetic attraction component and the guide groove are arranged in sequence and at intervals on the plane orthogonal to the optical axis. The magnetic attraction component is an iron sheet. The number of the magnets is 4. The number of the second coils and the magnetic attraction components is consistent with the number of the magnets. The magnets are arranged along the four peripheries of the second carrier.

18. The lens driving device according to claim 17, wherein: The driving mechanism can drive the first carrier within a range of ±250 μm along the optical axis, and the driving mechanism can drive the second carrier within a range of ±150 μm along a plane perpendicular to the optical axis.

19. A camera module, characterized in that: include: The lens driving device according to any one of claims 1 to 18; A lens assembly, equipped with at least one lens; The photosensitive component is provided with the fixed base between the photosensitive component and the lens component, so that the photosensitive component can sense light and form an image.

Images