WO2022257714A1

WO2022257714A1 - Lens driving apparatus and camera module

Info

Publication number: WO2022257714A1
Application number: PCT/CN2022/093533
Authority: WO
Inventors: 阙嘉耀; 赵波杰; 方银丽; 周济; 郑雪莹
Original assignee: 宁波舜宇光电信息有限公司
Priority date: 2021-06-10
Filing date: 2022-05-18
Publication date: 2022-12-15
Also published as: CN115469422A; CN117441121A

Abstract

Disclosed are a lens driving apparatus and a camera module. The lens driving apparatus comprises a mobile carrier, a fixed base, a driving mechanism, a guide groove, a supporting mechanism, and a magnetic attraction member. The mobile carrier is used to accommodate a lens assembly, and the fixed base and the mobile carrier are arranged opposite to each other at an interval along the optical axis direction. The driving mechanism is located on the circumferential side of the mobile carrier, and the driving mechanism comprises at least one set of coils and at least one set of magnets. The guide groove is arranged between the fixed base and the mobile carrier, the supporting mechanism is movably arranged in the guide groove, and the magnetic attraction member is mounted on the fixed base and arranged opposite to the magnets, so that a magnetic attraction force along the optical axis direction is generated between the magnetic attraction member and the magnets. Therefore, the structure of the lens driving apparatus is simple, which implements an AF function of a lens in the optical axis direction and an OIS function of an optical axis orthogonal surface while ensuring the miniaturization of the camera module.

Description

Lens driving device and camera module

technical field

The invention relates to the technical field of camera modules, in particular to a lens driving device and a camera module.

Background technique

In the field of consumer electronics, especially in the field of smart phones, a miniaturized and lightweight camera module is an indispensable component. At present, at least one camera module is configured on a portable terminal body. In order to meet more and more extensive market demands, higher requirements are put forward for features such as high pixel and high frame rate of camera modules, which is an irreversible development trend of existing camera modules.

The motor is an indispensable component of the high-pixel camera module. During the working process of the camera module, the motor can drive the lens to move in multiple directions to realize the optical autofocus function (hereinafter referred to as the AF function, Auto Focus) during the shooting process. , autofocus) and optical image stabilization function (hereinafter referred to as OIS function: Optical Image Stabilization, optical image stabilization), the AF function refers to the motor to make the bracket with the lens move linearly in the direction of the optical axis to focus on the subject , to produce sharp images at the image sensor (CMOS, CCD, etc.) located behind the lens. The OIS function refers to the function of improving the image definition by adaptively moving the bracket with the lens in the direction of compensating the shake when the lens shakes due to the shake.

As the image quality requirements of mobile phone camera modules are getting higher and higher, the volume and weight of the lens are getting larger and larger, and the requirements for the driving force of the motor are also getting higher and higher. However, current electronic devices (such as mobile phones) have relatively large restrictions on the volume of the camera module, and the occupied volume of the motor increases correspondingly with the increase of the lens. In other words, with the trend of lenses becoming larger and heavier, it is difficult for the driving force provided by the motor to increase accordingly. On the premise that the driving force is limited, the heavier the lens, the shorter the motor can drive the lens to move, which affects the focus and anti-shake capabilities. In order to achieve better optical focus and optical anti-shake functions, more is usually required. Big travel moves.

On the other hand, due to the increased weight of the lens, the speed at which the motor drives the lens to move becomes slower, and the longer it takes for the lens to reach the predetermined compensation position, it will directly affect the focusing and anti-shake effects, resulting in unclear images. To increase the driving force of the motor, it is necessary to increase the volume of the motor, resulting in a complicated motor mechanism, an increased number of parts, and a tendency to increase the thickness of the main body of the device.

Contents of the invention

An object of the present invention is to provide a lens driving device and a camera module, which have a simple structure, can ensure the miniaturization of the camera module, and at the same time realize the AF function of the lens in the direction of the optical axis and the OIS function of the plane perpendicular to the optical axis.

Another object of the present invention is to provide a lens driving device and a camera module. By separately setting the optical image stabilization and auto-focus, it is convenient to obtain a larger anti-shake stroke and focusing stroke, which is beneficial to the large shake of the camera module. Compensation is performed without increasing the volume of the motor, thereby ensuring the miniaturization of the camera module.

Another object of the present invention is to provide a lens driving device and a camera module, which facilitates maintaining the stability of the movable carrier in the camera module through the magnetic attraction force generated between the magnetic attraction member and the magnet along the optical axis direction, and keeps the The effect in the medium can effectively prevent the movable carrier from falling off when the camera module is shaken or turned upside down.

Another object of the present invention is to provide a lens driving device and a camera module, which can ensure displacement accuracy and reduce friction through the supporting mechanism and the guide groove, so as to improve the anti-shake stroke of the camera module.

In order to achieve the above object, 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 member, the movable carrier is used to accommodate the lens assembly, The fixed base and the movable carrier are disposed opposite to each other at intervals along the optical axis, the driving mechanism is located on the peripheral side of the movable carrier, the driving mechanism includes at least one set of coils and at least one set of magnets, the A guide groove is provided between the fixed base and the movable carrier, the support mechanism is movably arranged in the guide groove, and the magnetic attraction member is installed on the fixed base and opposite to the magnet The magnetic attraction force along the optical axis can be generated between the magnetic attraction member and the magnet.

As a preference, the at least one group of coils includes at least one first coil and at least one second coil, and the magnets are set apart from the first coil and the second coil respectively, and the first coil Forming a first magnetic field loop with the magnet, it is possible to drive the movable carrier to move along the optical axis for automatic focusing; the second coil and the magnet form a second magnetic field loop to drive the movable carrier relative to the The fixed base moves in the direction of the plane perpendicular to the optical axis to perform shake correction.

As a preference, the movable carrier includes a first carrier and a second carrier, the first carrier is movably built in the second carrier, the lens assembly is accommodated in the first carrier, and the first carrier The 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 the axis direction, the second coil is placed on the fixed base.

As a preference, the magnetic attraction member is located on the back of the second coil, and the magnetic attraction member and the second coil are fixed on the periphery of the fixed base so as to be relatively axially arranged.

As a preference, the guide groove includes a plurality of rails, and the rails are respectively set on the opposite surfaces of the fixed base and the second carrier, and each of the supporting mechanisms is accommodated in each of the rails, so that The support mechanism can rollably support the radial displacement of the second carrier along the plane perpendicular to the optical axis.

As a preference, 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, and the tracks are respectively located on the adjacent sides of the second coil. At intervals, the first track is set on the upper surface of the fixed base along the X direction or the Y direction, and the second track is relatively set on the lower surface of the second carrier along the Y direction or the X direction, so that The balls move within the first track or the second track.

As a preference, the number of the supporting mechanisms is at least three, the number of the guide grooves is at least three pairs, and the supporting mechanisms are balls.

As a preference, the number of the guide grooves and the support mechanisms are four respectively, and the guide grooves are respectively recessed at the four corners of the fixed base and the second carrier, and the support mechanisms Rollably supported on the four corners of the second carrier.

As a preference, cross-sectional structures of the first track and the second track are U-shaped, V-shaped or trapezoidal.

As a preference, the second carrier is provided with an accommodating cavity, a first opening and a second opening, the accommodating cavity is located around the second carrier, and the first opening is opened in the accommodating cavity The radial inner side of the second opening is opened on the axially lower side of the accommodating cavity, and the magnet is fixed in the accommodating cavity.

As a preference, the movable carrier further includes an elastic support member, the elastic support member is elastically connected to the first carrier and the second carrier, and the elastic support member can support the first carrier relative to the second carrier. The two carriers move and focus along the optical axis, the elastic support includes an upper elastic piece, a lower elastic piece and at least a pair of extensions, the upper elastic piece is movably connected to the upper surfaces of the first carrier and the second carrier, The lower elastic piece is movably connected to the lower surfaces of the first carrier and the second carrier, and the extension part is electrically connected to the second carrier and the elastic support member, so that the first coil is electrically connected on the second carrier.

As a preference, there are two or four extension parts, the extension parts are respectively fixed at the corners of the second carrier, and each extension part includes a first fixed end, a second fixed end and a suspension wire , the suspension wire is curvedly connected to the first fixed end and the second fixed end, and the first fixed end is affixed to the second carrier.

As a preference, the extension includes a pair of conductive extensions and a pair of reset extensions, the conductive extensions are used to conduct electrical conduction between the first coil and the second carrier, and the conductive extensions are respectively located at At a pair of same-side corners of the second carrier, the reset extensions are respectively located at another pair of same-side corners of the second carrier, and the second fixed end of the conductive extension is fixedly connected to the upper The elastic piece or the lower elastic piece; the second fixed end of the reset extension part is affixed to the extension column of the fixed base, and the reset extension part is used for the movement of the second carrier along the plane perpendicular to the optical axis reset.

As a preference, an axial distance is formed between the second coil and the magnet, the axial distance is 0.05-0.5mm, preferably, the axial distance is 0.1-0.3mm, preferably, the The axial spacing is 0.1 mm.

As a preference, the magnetic attraction member and the guide groove are sequentially arranged at intervals on a plane perpendicular to the optical axis.

As a preference, the magnetic member is an iron sheet, the number of the magnet is four, the number of the second coil and the magnetic member is consistent with the number of the magnet, and the magnet is along the The four perimeters of the second carrier are arranged.

As a preference, the driving stroke of the first carrier along the optical axis direction of the driving mechanism is ±250 μm, and the driving stroke of the second carrier along the direction perpendicular to the optical axis is ±250 μm. 150 μm.

A camera module includes the above-mentioned lens driving device, a lens assembly, and a photosensitive assembly, the lens assembly is equipped with at least one lens, the fixed base is arranged between the photosensitive assembly and the lens assembly, and the photosensitive assembly can be Photosensitive imaging.

Description of drawings

FIG. 1 is a schematic structural view of a camera module according to an embodiment of the present application;

FIG. 2 is an exploded view of a camera module according to an embodiment of the present application;

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

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

Fig. 5 is a schematic structural view of a fixed base and a supporting mechanism according to an embodiment of the present application;

Fig. 6 is a structural schematic diagram of a movable carrier and a supporting mechanism according to an embodiment of the present application.

Symbols 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 elastic sheet; 232, lower elastic sheet; 233, extension; 233a, conductive extension; 233b, reset extension; 234a, upper inner profile; 235a, upper outer profile 236a, upper elastic portion; 234a, lower inner profile; 235a, lower outer profile; 236a, lower elastic portion; 237, first fixed end; 238, second fixed end; 239, suspension wire; 30, driving mechanism; 31 , the first coil; 32, the second coil; 33, the magnet; 41, the guide groove; 411, the first track; 412, the second track; 42, the support mechanism; 43, the magnetic member;

Detailed ways

In the following, the present invention will be further described in conjunction with specific implementation methods. It should be noted that, on the premise of not conflicting, the various embodiments or technical features described below can be combined arbitrarily to form new embodiments.

In the description of the present invention, it should be noted that for orientation words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "upper", "lower" , "Front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise " and other indication orientations and positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, or in a specific orientation. The structure and operation should not be construed as limiting the specific protection scope of the present invention.

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

The terms "comprising" and "having" and any variations thereof in the description and claims of the present application are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or process comprising a series of steps or units. The apparatus is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to the process, method, product or apparatus.

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 illustrate A human perceived bias inherent in a measured or calculated value.

In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, a contact connection or an indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

According to the first aspect of the present application, a lens driving device 2 is provided. As shown in FIGS. The supporting mechanism 42 and the magnetic attraction member 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, and the driving mechanism 30 is located at On the peripheral side of the movable carrier 20, the driving mechanism 30 includes at least one set of coils and at least one set of magnets 33, the guide groove 41 is arranged between the fixed base 10 and the movable carrier 20, the The support mechanism 42 is movably arranged in the guide groove 41, and the magnetic attraction member 43 is mounted on the fixed base 10 and arranged opposite to the magnet 33, so that the magnetic attraction member 43 and the magnet 33 generate a magnetic attraction along the optical axis. Thereby, the support mechanism 42 can support the relative movement between the fixed base 10 and the movable carrier 20 along the guide groove 41, so as to provide support and guidance for the movable carrier 20, improve displacement accuracy and Anti-shake stroke, at the same time, through the magnetic attraction member 43 and the magnet 33 oppositely arranged along the optical axis direction, a magnetic attraction force along the optical axis direction is generated between the magnetic attraction member 43 and the magnet 33, which is convenient to keep the loaded The stability of the movable carrier 20 of the magnet 33 in the camera module maintains the centering effect of the movable carrier 20 and effectively prevents the movable carrier 20 from falling off as the camera module shakes or is turned upside down.

Wherein, the magnetic attraction member 43 and the magnet 33 are arranged oppositely along the optical axis direction, and generate a magnetic attraction force along the optical axis direction, since the magnetic attraction member 43 and the magnet 33 are not completely aligned, as described When the movable carrier 20 moves along the plane perpendicular to the optical axis, there will be an offset between the magnet 33 and the magnetic member 43, but the plane where the magnet 33 is located and the plane where the magnetic member 43 is always kept parallel, At the same time, the plane where the magnet 33 is located and the plane where the magnetic attraction member 43 is located are respectively perpendicular to the optical axis, so “the magnetic attraction force along the optical axis direction is generated between the magnetic attraction member 43 and the magnet 33” It refers to the magnetic attraction force generated between the plane where the magnet 33 is located and the plane where the magnetic attraction member 43 is located, including but not limited to the vertical magnetic attraction force and the inclined magnetic attraction force deviated from the vertical direction.

In some embodiments, the lens driving device 2 further includes a housing 50, the housing 50 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 side in the positive direction of the Z-axis, and the rear refers to the side in the negative direction of the Z-axis. The movable carrier 20 and the supporting mechanism 42 are disposed in the accommodation cavity formed by the housing 50 and the fixed base 10 .

In this embodiment, the description will be made using a rectangular coordinate system (X, Y, Z). The Z direction is the direction of the optical axis and the front-rear direction. , the X direction is the up and down direction (or the left and right direction), the Y direction is the left and right direction (or the up and down direction), the plane perpendicular to the optical axis is the plane formed by the X direction and the Y direction, and the "radial" is orthogonal to the Z axis "Axial" refers to the opposite setting between two Z-axis orthogonal surfaces, including not only the direction parallel to the Z-axis, but also the direction close to the Z-axis.

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 set apart from the first coil 31 and the second coil 32 respectively. , the first coil 31 and the magnet 33 form a first magnetic field circuit, so as to drive the movable carrier 20 to move along the optical axis for autofocus, and the second coil 32 and the magnet 33 form a second magnetic field The circuit is used to drive the movable carrier 20 to move relative to the fixed base 10 along the direction of the plane perpendicular to the optical axis to perform shake correction.

The movable carrier 20 includes a first carrier 21 and a second carrier 22, the first carrier 21 is movably built in the second carrier 22, the lens assembly 1 is accommodated in the first carrier 21, the The first coil 31 is arranged 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 arranged radially relative to each other, and the magnet 33 and the second coil 32 are arranged axially opposite to each other, and the second coil 32 is placed on the fixed base 10 . Wherein, the relative radial arrangement of the magnet 33 and the first coil 31 means that the magnet 33 and the first coil 31 are oppositely arranged in the X direction or the Y direction, and the magnet 33 and the second coil The arrangement of 32 relative to the axial direction means that the magnet 33 and the second coil 32 are arranged opposite to each other along the Z direction.

If the first coil 31 is energized, based on the interaction between the magnetic field generated by the magnet 33 and the current flowing through the first coil 31, the first magnetic field circuit is formed, and a Lorentz force is generated to drive The first carrier 21 with the first coil 31 moves along the Z direction, thereby driving the lens assembly 1 to move along the Z direction to realize autofocus, and the direction of the Lorentz force is in line with the direction of the magnetic field (X direction or Y direction) and the direction (Z direction) orthogonal to the direction of the current in the first coil 31 (Y direction or X direction).

If the second coil 32 is energized, based on the interaction between the magnetic field of the magnet 33 and the current flowing in the second coil 32, a Lorentz force is generated to drive the magnet 33. The second carrier 22 moves along the X direction or the Y direction, thereby driving the first carrier 21 and the lens assembly 1 to move along the X direction or the Y direction, realizing OIS anti-shake correction, and the Lorentz in the second magnetic field circuit The force direction is a direction (Y direction or X direction) perpendicular to the direction of the magnetic field (Z direction) and the direction of the current (X direction or Y direction).

In some embodiments, the magnetic attraction member 43 is located on the back of the second coil 32 , and the magnetic attraction member 43 and the second coil 32 are fixed on the periphery of the fixed base 10 in an axially opposite manner. . That is to say, the magnetic attraction member 43 overlaps with the second coil 32, and the magnetic attraction member 43 can be built into the fixed base 10, such as the magnetic attraction member 43 is completely covered by the fixed base. Covered by the base 10, the second coil 32 is fixed on the surface of the fixed base 10 to avoid increasing the height of the lens driving device 2; the magnetic attraction member 43 can also be embedded in the fixed base 10 , if the magnetic member 43 is partially embedded in the fixed base 10, the front of the magnetic member 43 is higher than the surface of the fixed base 10, and the second coil 32 is superimposed on the magnetic The front side of the component 43 ; the magnetic component 43 can also be placed flat on the surface of the fixed base 10 , and the second coil 32 is superimposed on the front side of the magnetic component 43 . Wherein, the magnetic attraction member 43 and the second coil 32 are both disposed opposite to the magnet 33 . Wherein, the number of the magnetic attraction members 43 is the same as the number of the magnets 33 , at least three.

Wherein, the magnetic attraction member 43 is arranged opposite to the magnet 33 along the Z direction, rather than along the X direction or the Y direction (for example, the magnetic attraction member 43 is arranged on the side wall of the housing 50 Above), when the magnetic attraction member 43 is arranged on the side wall of the housing 50, the magnetic attraction member 43 generates a magnetic attraction force in the X direction or the Y direction to the magnet 33, and when the OIS stroke increases , the distance between the magnet 33 and the magnetic attraction member 43 will increase, and the magnetic attraction force will weaken, resulting in difficulty in reset. With respect to the arrangement of the magnetic attraction member 43 and the magnet in the X direction or the Y direction, the arrangement of the magnetic attraction member 43 and the magnet 33 in the Z direction is helpful to produce Z to the magnet 33. direction, when the stroke required by the magnet 33 on the plane perpendicular to the optical axis increases, the distance between the magnetic attraction member 43 and the magnet 33 will not be affected by the stroke of the OIS, which is convenient for realizing more Large OIS travel is conducive to quick reset.

In some embodiments, the magnetic attraction member 43 is made of a material capable of attracting each other with the magnet 33 and generating a magnetic attraction force, such as iron sheet or the like. The magnetic attraction force between the iron sheet and the magnet 33 makes the frictional contact between the second carrier 22 and the movable base 10 through the supporting mechanism 42, so as to keep the stability of the second carrier 22 in the camera module. property, so that the second carrier 22 maintains the effect of being centered, and will not fall off with the shaking or inversion of the camera module. At the same time, the movable carrier 20 passes through the magnetic attraction member 43 and the The magnetic attraction force between the magnets 33 quickly returns to the initial position, and the initial position is the position of the movable carrier 20 before optical image stabilization.

In some embodiments, the guide groove 41 includes a plurality of rails, and the rails are respectively opened on the opposite surfaces of the fixed base 10 and the second carrier 22, and each of the support mechanisms 42 is accommodated in each of the In the track, the supporting mechanism 42 can rollably support the second carrier 22 to radially displace along the plane perpendicular to the optical axis. Therefore, the track is provided between the fixed base 10 and the second carrier 22, and the supporting mechanism 42 is accommodated in the track, so that the second When the carrier 22 moves along the X direction and/or the Y direction relative to the fixed base 10, the support mechanism 42 always maintains dynamic support for the second carrier 22, so that the second carrier 22 Smooth sliding ensures displacement accuracy.

In some embodiments, the guide groove 41 is provided with a first rail 411 and a second rail 412, the first rail 411 and the second rail 412 are in a cross structure, and the rails are respectively located on the adjacent At the interval between the second coils 32, the first rail 411 is set on the upper surface of the fixed base 10 along the X direction or the Y direction, and the second rail 412 is relative to the first rail 411 along the Y direction. direction or X direction is set on the lower surface of the second carrier 22, 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 show. Therefore, by setting different directions of the first track 411 and the second track 412, the movement trajectory of the support mechanism 43 is limited within the track, which facilitates the movement of the second carrier 22 At the same time, rolling friction can be used instead of sliding friction through balls, further reducing the friction between the second carrier 22 and the fixed base 10, effectively improving the second carrier 22 in the Motion stabilization during autofocus and optical image stabilization improves image quality.

Wherein, the upper surface of the fixed base 10 and the lower surface of the second carrier 22 refer to the direction along the optical axis, and the direction from the fixed base 10 to the second carrier 22 is from bottom to top.

In some embodiments, the number of the support 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 each of the guide grooves 41 is provided with a ball.

The number of the guide groove 41 and the support mechanism 42 is four respectively, the magnetic attraction member 43 and the guide groove 41 are arranged at intervals in sequence on the plane perpendicular to the optical axis, and the position of the guide groove 41 can be Set on the opposite corners along the plane perpendicular to the optical axis, the magnetic attraction member 43 can be set on the four sides of the fixed base 10, or the position of the guide groove 41 is set on the four sides along the plane perpendicular to the optical axis , the magnetic attraction members 43 may be disposed at the four corners of the fixed base 10 .

In some embodiments, the guide grooves 41 are recessed at the four corners of the fixed base 10 and the second carrier 22 , and the supporting mechanism 42 is rotatably supported on the second carrier 22 and the four corners of the fixed base 10, thereby helping to maintain the stability of the second carrier 22. And placing the guide groove 41 and the supporting mechanism 42 at the four corners opposite to the fixed base 10 and the second carrier 22 can make full use of the advantages of the fixed base 10 and the second carrier 22 free space, so as to provide a larger spatial position for the guide groove 41, so that it has a longer longitudinal dimension, so that the second carrier 22 can be guided by the guide groove 41 and the support mechanism 42 When , a larger movement stroke can be provided for the second carrier 22 , thereby facilitating the realization of optical anti-shake with a larger stroke.

Wherein, for the guide groove 41 provided in the X direction, the length along the X direction is greater than the diameter of the support mechanism 42, and the dimension along the Y direction is equal to or slightly greater than the diameter of the support mechanism 42, ensuring that the support The movement of the mechanism 42 along the X direction; for the guide groove 41 provided 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. diameter, to ensure that the support mechanism 42 moves along the Y direction.

Wherein, 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 larger than the diameter of the support mechanism 42 .

In some embodiments, the number of the magnets 33 is four, the number of the second coil 32 and the magnetic attraction member 43 is consistent with the number of the magnets 33, and the magnets 33 are along the second carrier 22, the magnet 33 and the magnetic member 43 are arranged oppositely, and the magnetic member 43 is arranged on the upper surface of the fixed base 10 and is located on the four sides of the fixed base 10, The second coil 32 is superimposed on the top of the magnetic attraction member 43, and a magnetic attraction force is generated between the second carrier 22 and the fixed base 10 through the magnetic attraction member 43 and the magnet 33, so The magnets 33 are located on the four sides of the second carrier 22 , and since the four sides of the second carrier 22 have larger space, it is suitable for arranging larger magnets 33 , thereby providing greater driving force.

In some embodiments, the cross-sectional structure of the first rail 411 and the second rail 412 is U-shaped, V-shaped or trapezoidal.

In some embodiments, the second coil 32 is arranged on the four sides of the fixed base 10 and is arranged opposite to the magnet 33, and an axial distance is formed between the second coil 32 and the magnet 33 , 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. Therefore, the magnet 33 will not be in contact with the second coil 32 to cause interference, and good magnetic induction can be generated.

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, the shared magnet of the first coil 31 and the second coil 32 Magnet, when performing autofocus, the first coil 31 can generate electromagnetic induction with the magnet 33 after being energized, so as to drive the first coil 31 and then drive the first carrier 21 to move along the optical axis direction to realize the lens AF, because it only needs to drive the first carrier 21 and the lens assembly 1 therein to move, relatively speaking, only a small driving force is required in the AF process to reduce power consumption; when performing optical anti-shake When the second coil 32 is energized, it can generate electromagnetic induction with the magnet 33 to drive the magnet 33 to drive the second carrier 22 and then drive the first carrier 21 to move, so that the movable carrier 20 as a whole Moving along the direction perpendicular to the optical axis, the four sets of second coils 32 interact with the magnets 33 to generate greater driving force. In this application, the AF stroke and the OIS stroke are controlled separately to avoid mutual interference between AF and OIS, reduce the burden on each component, and do not need to move the movable carrier 20 as a whole during autofocus. 33 In the case of a certain volume and driving force, the AF stroke can be effectively increased.

Wherein, each of the magnets 33 includes four magnetic poles, and each N pole and S pole are arranged adjacent to each other. Since the magnets 33 are dual-purpose magnets, the number of parts can be reduced, so that the structure of the lens driving device 2 more simple. Wherein, other position sensing devices such as an IC and a Hall device may be arranged in the second coil 32 to be opposite to the magnet 33 to detect the position of the magnet 33 .

In some embodiments, the second carrier 22 is provided with an accommodating cavity 221 , a first opening 222 and a second opening 223 , the accommodating cavity 221 is located around the second carrier 22 , and the first opening 222 is opened on the radial inner side of the accommodation cavity 221 , the second opening 223 is opened on the axial lower side of the accommodation cavity 221 , and the magnet 33 is fixed in the accommodation cavity 221 . Wherein, the accommodating cavity 221 is located on the four sides of the second carrier 22, the accommodating cavity 221 is an open cavity, and the magnet 33 is fixed in the accommodating cavity 221 in an upside-down manner. The magnet 33 is spaced opposite to the first coil 21 , and the magnet 33 is spaced opposite to the second coil 32 .

In some embodiments, the movable carrier 20 further includes an elastic support member 23, the elastic support member 23 elastically connects the first carrier 21 and the second carrier 22, and the elastic support member 23 can support the The first carrier 21 moves and focuses relative to the second carrier 22 along the optical axis. The elastic support 23 includes an upper elastic piece 231, a lower elastic piece 232 and at least one pair of extensions 233. The upper elastic piece 231 is movably connected to the The upper surface of the first carrier 21 and the second carrier 22, the lower elastic piece 232 is movably connected to the lower surface of the first carrier 21 and the second carrier 22, and the extension part 233 is electrically connected. The second carrier 22 and the elastic supporting member 23 make the first coil 31 electrically connected to the second carrier 22 . Wherein, the upper elastic piece 231 and the lower elastic piece 232 may also be respectively fixed on the side wall of the second carrier 22 , which is not limited in this application. Therefore, the first carrier 21 can be centered by the elastic support member 23, and the elastic support member 23 keeps the first carrier 21 in the second carrier 22 by elastic force, and at the same time, the elastic support The member 23 pulls the first carrier 21 back to the initial position by elastic force, wherein the initial position refers to the position of the first carrier 21 before being displaced along the optical axis direction AF. Wherein, the upper surface and the lower surface are the directions along the optical axis of the first carrier 21 and the second carrier 22 respectively, the front of the optical axis is the upper surface, and relatively speaking, the rear of the optical axis is the lower surface.

In some embodiments, the upper elastic piece 231 includes an upper inner profile 234a, an upper outer profile 235a, and an upper elastic portion 236a, and the upper elastic portion 236a elastically connects the upper inner profile 234a and the upper outer profile portion 235a, The upper inner frame 234a and the upper outer frame 235a can move relative to each other along the Z direction, wherein the upper inner frame 234a is fixed on the upper surface of the first carrier 21, and the upper outer frame 235a It is fixed on the upper surface of the second carrier 22, so that the upper elastic piece 231a can be movably connected to the upper surface of the first carrier 21 and the upper surface of the second carrier 22, wherein the fixing method is not As a limitation, it can be fixed by fitting or bonding. Wherein, the upper elastic portion 236a has a meandering structure, which is convenient for elastically connecting the upper inner profile 234a and the upper outer profile 235a.

In some embodiments, the structure of the lower elastic piece 232 is similar to that of 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 part 236b, and the lower elastic part 236b is elastically connected The lower inner profile 234b and the lower outer profile portion 235b enable relative movement between the lower inner profile 234b and the lower outer profile 235b along the Z direction, wherein the lower inner profile 234b is fixed to the The lower surface of the first carrier 21, the lower outer shell 235b is fixed on the lower surface of the second carrier 22, so that the lower elastic piece 231b is movably connected to the lower surface of the first carrier 21 and the lower surface of the second carrier 22. Referring to the lower surface of the second carrier 22, the fixing method is not limited, and it can be fixed by fitting or bonding. Wherein, the lower elastic portion 236 has a meandering structure, which is convenient for elastically connecting the lower inner profile 234b and the lower outer profile 235b.

In some embodiments, each of the extension parts 233 includes a first fixed end 237, a second fixed end 238 and a suspension wire 239, and the suspension wire 239 is curvedly connected to the first fixed end 237 and the second fixed end. end 238, the first fixed end 237 is attached to the outer 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 elastic piece 231 and/or the The lower elastic piece 232 can be electrically connected to the first coil 31 and the second carrier 22 through the upper elastic piece 231 and/or the lower elastic piece 232 .

In some embodiments, the number of the extensions 233 may be two or four, and when the number of the extensions 233 is two, the circuit conduction is realized through the extensions 233; When the number of the extension parts 233 is 4, one pair of the extension parts 233 realizes the circuit conduction, and the other pair of the extension parts 233 realizes the reset function of the lens assembly 1 through its elastic force. Further, they are respectively fixed at the four corners of the second carrier 22, and a pair of the extension parts 233 are respectively integrally connected to both sides of the upper elastic piece 231, so as to electrically connect the first coil 31 and the second coil 31. Second carrier 22. Therefore, the electrical connection between the first coil 31 and the second carrier 22 can be realized through the electrical connection between the extension part 233 and the second carrier 22, and the extension part 233 can be connected to the upper elastic piece 231 Or the lower elastic piece 232 has an integrated structure or a split structure, the upper elastic piece 231 can have an integrated structure or a split structure, the lower elastic piece 232 can have an integrated structure or a split structure, and the second coil 32 The electrical connection between the second coil 32 and the second carrier 22 can be realized through a wire or a pin that is electrically connected upward to the second carrier 2 . That is to say, the second carrier 22 integrates a conductive function, electrically connects the first coil 31 and the second coil 32 to the second carrier 22, and conducts electricity through the second carrier 22. to the outside of the lens driving device 2 to simplify the electrical connection structure of the lens driving device 2 .

In some embodiments, the pair of extensions 233 are disposed at a pair of adjacent corners of the second carrier 22, so as to electrically connect the first coil 31 and the second carrier 22, and the first The 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 affixed to the upper elastic piece 231 or the lower elastic piece 232; The extension part 233 is provided 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 elastic piece 231 or the lower elastic piece 232, and the other pair of extensions 233 are non-conductive, and provide a certain amount of resistance for the lens assembly 1 when performing OIS through its elastic force. Restoring 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 affixed to the extension columns, so that The second carrier 22 is pulled back to the initial position by the elastic force of the extension part 233 , wherein the initial position refers to the position of the second carrier 22 before OIS displacement.

That is to say, the extension part 233 includes a pair of conductive extension parts 233a and a pair of reset extension parts 233b, the conductive extension part 233a is used for electrically conducting the first coil 31 and the second carrier 22, the The conductive extensions 233a are respectively located at a pair of corners on the same side of the second carrier 22, and the reset extensions 233b are respectively located at the other pair of corners of the same side of the second carrier 22. The conductive extensions 233a The first fixed end 237 is affixed to the second carrier 22, the second fixed end 238 of the conductive extension 233a is affixed to the upper elastic piece 231 or the lower elastic piece 232; The first fixed end 237 is fixed to the second carrier 22, the second fixed end 238 of the reset extension 233b is fixed to the extension column of the fixed base 10, and the reset extension 233b is used for The reset of the second carrier 22 moving along the plane perpendicular to the optical axis pulls the second carrier 22 back to the initial position through the elastic force of the reset extension 233b. The initial position refers to that the second carrier 22 is performing OIS position before displacement.

In some embodiments, the circuit is integrally molded on the second carrier 22 by using an Insert molding process, and is conducted from the second carrier 22 to the outside of the lens driving device 2 to facilitate circuit conduction.

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

In some embodiments, the drive mechanism 30 can drive the stroke of the first carrier 21 along the optical axis direction is ±250 μm, and the drive mechanism 30 can drive the stroke of the second carrier 22 along the direction of the plane perpendicular to the optical axis. The actuable stroke is ±150μm.

According to the second aspect of the present application, a camera module is provided, including the above-mentioned lens driving device 2, the lens assembly 1 and the photosensitive assembly, the lens assembly 1 is equipped with at least one lens; the fixed base 10 is arranged on Between the photosensitive component and the lens component 1, the photosensitive component can be photosensitive and imaged.

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 sticking or buckling, or the lens barrel can be fixed to the first carrier 21 The lens assembly 1 and the first carrier 21 are provided as an integral structure, that is, the first carrier 21 has a structure replacing the lens barrel for accommodating the lens in the lens assembly 1. When the first carrier 21 is along When moving in the direction of the optical axis, it can drive the lens assembly 1 to move to realize the AF function. Compared with the conventional motor structure where the lens barrel is fixed in the first carrier 21, the integrated structure can reduce all The size of the lens barrel and the reduction of the gap between the conventional lens barrel and the first carrier 21 help to further reduce the size of the camera module.

The basic principles, main features and advantages of the present invention have been described above. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description are only the principles of the present invention. Variations and improvements, which fall within the scope of the claimed invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

A lens driving device, characterized in that it comprises:

a movable carrier, the movable carrier is used for accommodating the lens assembly;

a fixed base, the fixed base and the movable carrier are arranged facing each other at intervals along the optical axis;

a driving mechanism, the driving mechanism is located on the peripheral side of the movable carrier, and the driving mechanism includes at least one set of coils and at least one set of magnets;

a guide groove, the guide groove is arranged between the fixed base and the movable carrier;

a support mechanism, the support mechanism is movably arranged in the guide groove;

The magnetic attraction member is installed on the fixed base and arranged opposite to the magnet so as to generate a magnetic attraction force along the optical axis between the magnetic attraction member and the magnet.
The lens driving device according to claim 1, wherein the at least one set of coils includes at least one first coil and at least one second coil, and the magnets are connected to the first coil and the second coil respectively. Relatively spaced apart, the first coil and the magnet form a first magnetic field loop to drive the movable carrier to move along the optical axis for automatic focusing, and the second coil and the magnet form a second magnetic field loop , so that the movable carrier can be driven to move relative to the fixed base along the direction of the plane perpendicular to the optical axis to perform shake correction.
The lens driving device according to claim 2, wherein the movable carrier includes a first carrier and a second carrier, the first carrier is movably built in the second carrier, and the lens assembly is accommodated in the second carrier. 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 The magnet and the second coil are axially arranged relative to each other, and the second coil is arranged on the fixed base.
The lens driving device according to claim 3, wherein the magnetic attraction member is located on the back of the second coil, and the magnetic attraction member and the second coil are fixed to the fixed around the base.
The lens driving device according to claim 3, wherein the guide groove includes a plurality of rails, and the rails are respectively opened on the opposite surfaces of the fixed base and the second carrier, and each of the supporting mechanisms Accommodated in each of the tracks, so that the bearing mechanism can rollably support the radial displacement of the second carrier along the plane perpendicular to the optical axis.
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, and the tracks are respectively located at At the interval between the adjacent second coils, the first track is set on the upper surface of the fixed base along the X direction or the Y direction, and the second track is set on the upper surface of the fixed base along the Y direction or the X direction. the lower surface of the second carrier, so that the supporting mechanism can move in the first track or the second track.
The lens driving device according to claim 6, wherein the number of the supporting mechanisms is at least three, the number of the guide grooves is at least three pairs, and the supporting mechanisms are balls.
The lens driving device according to claim 7, wherein the number of the guide grooves and the support mechanisms are four respectively, and the guide grooves are respectively concavely opened on the fixed base and the second At the opposite four corners of the carrier, the supporting mechanism is rotatably supported on the four corners of the second carrier.
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.
The lens driving device according to claim 3, wherein the second carrier is provided with an accommodating cavity, a first opening and a second opening, the accommodating cavity is located around the second carrier, the The first opening is opened on the radial inner side of the accommodating cavity, the second opening is opened on the axially lower side of the accommodating cavity, and the magnet is fixed in the accommodating cavity.
The lens driving device according to claim 3, wherein the movable carrier further comprises an elastic support member, and the elastic support member elastically connects the first carrier and the second carrier, and the elastic support member is Supporting the first carrier to move and focus relative to the second carrier along the optical axis direction, the elastic support member includes an upper elastic piece, a lower elastic piece and at least a pair of extensions, and the upper elastic piece is movably connected to the first carrier and the upper surface of the second carrier, the lower elastic piece is movably connected to the lower surface of the first carrier and the second carrier, and the extension part is electrically connected to the second carrier and the elastic support components, so that the first coil is electrically connected to the second carrier.
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, and each of the extension parts includes a first A fixed end, a second fixed end and a suspension wire, the suspension wire is curvedly connected to the first fixed end and the second fixed end, and the first fixed end is fixedly connected to the second carrier.
The lens driving device according to claim 12, wherein the extension part includes a pair of conductive extension parts and a pair of reset extension parts, and the conductive extension part is used to electrically connect the first coil and the second coil. Two carriers, the conductive extensions are respectively located at a pair of same-side corners of the second carrier, the reset extensions are respectively located at the other pair of same-side corners of the second carrier, the conductive extensions are The second fixed end is affixed to the upper elastic piece or the lower elastic piece; the second fixed end of the reset extension part is fixed to the extension column of the fixed base, and the reset extension part is used for the first The reset of the two carriers moving along the plane perpendicular to the optical axis.
The lens driving device according to any one of claims 3-13, wherein an axial distance is formed between the second coil and the magnet, and the axial distance is 0.05-0.5 mm, preferably, The axial spacing is 0.1-0.3 mm, preferably, the axial spacing is 0.1 mm.
The lens driving device according to claim 14, characterized in that, the magnetic attraction member and the guide groove are sequentially arranged at intervals on the plane perpendicular to the optical axis, the magnetic attraction member is an iron sheet, and the magnet The number is four, and 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.
The lens driving device according to claim 15, characterized in that, the driving distance of the driving mechanism to the first carrier along the optical axis is ±250 μm, and the driving mechanism to the second carrier along the optical axis The drivable stroke in the direction perpendicular to the plane is ±150μm.
A camera module, characterized in that it comprises:

The lens driving device according to any one of claims 1-16;

The lens assembly is equipped with at least one lens;

A photosensitive component, the fixed base is arranged between the photosensitive component and the lens component, and the photosensitive component can be photosensitive and imaged.