Lens driving device and camera module

Abstract

The invention relates to a lens driving device and a camera module, and the device comprises a carrier which is in sliding connection with a bearing moving body, and also comprises a first driving mechanism which drives the carrier to slide along the optical axis direction, and a second driving mechanism which drives the bearing moving body to slide along the optical axis direction relative to the carrier. The carrier is provided with a moving body movement stroke limiting structure on the bearing moving body in the moving direction of the optical axis, one part of the moving body movement stroke limiting structure is located on one side of the bearing moving body in the optical axis direction, and the other part of the moving body movement stroke limiting structure is located on the other side of the bearing moving body in the optical axis direction. The lens has the advantages that the movable body movement stroke limiting structure is arranged between the carrier and the bearing movable body, so that the bearing movable body is not in direct impact contact with the base, meanwhile, the convex part is designed to effectively solve the problem that the carrier and the lens are damaged due to long-stroke impact of the bearing movable body, and a new guide mechanism is designed between the carrier and the base, so that the service life of the lens is prolonged. And the stability and the consistency of carrier movement are obviously improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3C product accessories, and in particular relates to a lens driving device and a camera module. Background Art

[0002] A periscope lens drive device is an optical system commonly used in cameras and other optical devices to achieve long-stroke focusing and / or zooming.

[0003] The optical zoom focusing system is composed of multiple lens groups, which are used to collect and focus light; the driving mechanism usually includes an electromagnetic coil drive, etc., which is used to drive the movement of different lens groups. In the prior art, the lens group used for zooming is carried and driven by a separate zoom lens carrier, and the lens group used for focusing is carried and driven by a separate focus lens carrier, and this structure will cause one of the lens groups to have a too long travel. Summary of the invention

[0004] The purpose of the present invention is to provide a lens driving device and a camera module that can solve the above-mentioned technical problems.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A lens driving device comprises a carrier which slides relative to a base along an optical axis, the carrier being slidably connected to a supporting body, the lens driving device also comprising a first driving mechanism which drives the carrier to slide along the optical axis and the supporting body moves following the carrier, and a second driving mechanism which drives the supporting body to slide relative to the carrier along the optical axis, the carrier being provided with a moving body movement stroke limiting structure in the moving direction of the supporting body along the optical axis, a part of the moving body movement stroke limiting structure being located on one side of the supporting body along the optical axis, and another part of the moving body movement stroke limiting structure being located on the other side of the supporting body along the optical axis.

[0006] Furthermore, the moving body movement stroke limiting structure includes a first limiting portion which is provided on the carrier and located on one side of the supporting moving body along the optical axis direction, and a second limiting portion which is located on the other side of the supporting moving body along the optical axis direction, and an accommodating space for placing the supporting moving body is formed between the first limiting portion and the second limiting portion.

[0007] Furthermore, a first protrusion protruding along the optical axis direction is provided at one end of the supporting body close to the first limiting portion and / or the first limiting portion, and a second protrusion protruding along the optical axis direction is provided at the second limiting portion and / or one end of the supporting body close to the second limiting portion.

[0008] Furthermore, at least a portion of the first driving mechanism is fixed to one side of the base along a first direction perpendicular to the optical axis, and the remaining portion of the first driving mechanism is fixed to one side of the carrier along the first direction perpendicular to the optical axis; at least a portion of the second driving mechanism is fixed to the other side of the base, and the remaining portion of the second driving mechanism is fixed to one side of the carrier.

[0009] Furthermore, one side of the supporting body has a stroke extension arm extended along the direction of the optical axis, and the second driving mechanism includes a second driving coil and a second driving magnet that cooperate with each other, the second driving coil is fixed to the other side of the base, and the second driving magnet is fixed to one side of the supporting body and the stroke extension arm.

[0010] Furthermore, at least one side of the carrier is slidably matched with the base through a linear guide shaft, the carrier is provided with a sliding matching groove that slidably matches the linear guide shaft, and the base is provided with a reference positioning groove for supporting at least a partial section of the axial direction of the linear guide shaft.

[0011] Furthermore, the first driving mechanism includes a first driving coil and a first driving magnet that cooperate with each other, the first driving magnet is arranged on one side of the carrier along the first direction perpendicular to the optical axis, the first driving magnet and the linear guide shaft are located on the same side of the carrier along the first direction perpendicular to the optical axis, and the other side of the carrier is rollingly matched with the base through a rolling member.

[0012] Furthermore, the first driving mechanism includes a first driving coil and a first driving magnet that cooperate with each other, the first driving magnet is arranged on one side of the carrier along a first direction perpendicular to the optical axis, and the thickness of the part of the first driving magnet located between the first limiting portion and the second limiting portion in the first direction is smaller than the thickness of at least part of the rest of the first driving magnet.

[0013] Further, at least part of the first driving magnet includes at least two groups of magnets arranged along the first direction, and the two groups of magnets have different lengths in the optical axis direction.

[0014] As an application solution, the present application also provides a camera module, characterized in that the camera module includes the lens driving device.

[0015] Compared with the existing technology, the advantages of the present application are: from the perspective of the working state when powered on and the non-working state when powered off, as well as the perspective of assembly, the movement stroke limit structure of the moving body prevents the supporting moving body from colliding with the base, and can prevent the lens on the carrier from colliding with the lens on the supporting moving body, and the stroke limit can limit the extreme movement, making the movement of the lens on the supporting moving body safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the internal main structure assembly of the lens driving device of the present invention; Figure 2 for Figure 1 A schematic top view of the main structure of the middle lens driving device; Figure 3 for Figure 2 Schematic diagram of the structural assembly relationship of the AA section; Figure 4 It is an exploded left front schematic diagram of the main structure of the lens driving device of the present invention; Figure 5 It is an exploded right front schematic diagram of the main structure of the lens driving device of the present invention; Figure 6 It is an exploded left schematic diagram of the main structure of the lens driving device of the present invention; Figure 7 It is the assembly diagram A of the main related parts of the base of the present invention; Figure 8 It is the assembly diagram B of the main related parts of the base of the present invention; Fig. 9 It is the assembly diagram C of the main related parts of the base of the present invention; Fig.10 It is a bottom view schematic diagram of the carrier main body component of the present invention; Fig.11 for Figure 7 Detailed view of the main components in the middle B area; Fig.12 for Figure 8 Details of the main components in the middle C area; Fig.13 for Fig. 9 Details of the main components in the middle D area; Fig.14 This is a schematic diagram of an example of an electronic device equipped with a camera module in Example 2; Fig.15 This is a schematic diagram of an example distribution of driving magnets in the present invention.

[0017] In the figure, base 1, deepened avoidance groove 10, reference positioning groove 11, retaining structure 12, retaining sleeve 120, retaining frame 121, embedded part 1210, limiting boss 13, embedded groove 14, carrier 2, sliding fitting groove 21, first limiting part 22, second limiting part 23, avoidance position 24, connecting part 25, linear guide shaft 3, rolling member 4, load-bearing moving body 5, ball 50, first protrusion 51, second protrusion 52, stroke extension arm 53, first driving mechanism 6, first driving magnet 61, first driving coil 62, second driving mechanism 7, second driving magnet 71, second driving coil 72, first direction X, second direction Y, optical axis Z. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0019] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0020] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0021] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0022] Embodiment 1

[0023] like Figure 1-Figure 2 As shown, in this embodiment, the lens driving device includes a carrier 5 loaded on a carrier 2, wherein the carrier 5 is a carrier for focus movement, the carrier 2 in the above-mentioned first embodiment is a carrier for zoom movement, the carrier 2 is used to carry the lens group G2, and the carrier 5 is used to carry the lens group G3. When the device is working, the carrier 2 drives the carrier 5 to perform zoom movement together, and the carrier 5 moves relative to the carrier 2 to complete the focus. In other embodiments, the carrier 5 and the carrier 2 can respectively complete the focus and zoom movements at the same time, or the carrier 2 can move to complete the focus, and the carrier 5 can move to complete the zoom.

[0024] The carrier 2 is provided with a movement stroke limiting structure for the supporting movable body 5 in the moving direction along the optical axis Z; a part of the movement stroke limiting structure is located on one side of the supporting movable body 5 along the optical axis Z direction, and the other part of the movement stroke limiting structure is located on the other side of the supporting movable body 5 along the optical axis Z direction.

[0025] The moving body movement stroke limiting structure includes a first limiting portion 22 which is arranged on the carrier 2 and is located on one side of the supporting body 5 along the optical axis Z direction, and a second limiting portion 23 which is located on the other side of the supporting body 5 along the optical axis Z direction. An accommodating space for the supporting body 5 to be placed is formed between the first limiting portion 22 and the second limiting portion 23. The first limiting portion 22 and the second limiting portion 23 limit the moving stroke of the above-mentioned supporting body 5. At the same time, in order to prevent the supporting body 5 from having a large impact force on the carrier 2 during movement, which affects the quality of the device, a first protrusion 51 which protrudes along the optical axis Z direction is provided on the supporting body 5 close to the first limiting portion 22 and / or one end of the first limiting portion 22, and a second protrusion 52 which protrudes along the optical axis Z direction is provided on the second limiting portion 23 and / or one end of the supporting body 5 close to the second limiting portion 23.

[0026] In this embodiment, the first limiting portion 22 and the second limiting portion 23 extend with a width along a first direction X perpendicular to the optical axis Z direction, and extend with a height along a second direction Y perpendicular to the optical axis Z direction and the first direction X. The first limiting portion 22 and the second limiting portion 23 are respectively provided with light holes distributed along the optical axis Z to facilitate the passage of light.

[0027] Specifically, in the present embodiment, the first limiting portion 22 serves as the side wall of the carrier 2 facing the supporting body 5, and the first limiting portion 22 is directly formed on the carrier 2 when the carrier 2 is manufactured. In other embodiments, the first limiting portion 22 may also be subsequently fixed on the carrier 2, or there may be a gap between the first limiting portion 22 and the side wall of the carrier 2 facing the supporting body 5 and the first limiting portion 22 is connected by a beam extending along the optical axis Z direction.

[0028] like Figure 5 As shown, the second limiting portion 23 is located on the side of the supporting body 5 away from the first limiting portion 22, and the second limiting portion 23 is connected to the carrier 2 on at least one side along the first direction X through a connecting portion 25 extending along the optical axis Z direction. In this embodiment, the connecting portion 25 located on one side along the first direction X has a horizontal connecting portion 25 located below the supporting body 5 in the second direction Y and a vertical connecting portion 25 extending upward along the second direction Y, and the connecting portion 25 on the other side along the first direction X is located below the supporting body 5 in the second direction Y.

[0029] When the supporting body 5 moves toward and touches the first limiting portion 22, the first protrusion 51 can serve as a buffer between the first limiting portion 22 and the supporting body 5, thereby fully reducing the large instantaneous impact force generated by the collision of the supporting body 5 with the first limiting portion 22. Similarly, the second protrusion 52 has the same function as the first protrusion 51, thereby fully reducing the large instantaneous impact force generated by the collision of the supporting body 5 with the second limiting portion 23. At the same time, in this embodiment, the first protrusion 51 and the second protrusion 52 are fixed to the surfaces of the supporting body 5 facing the first limiting portion 22 and the second limiting portion 23 respectively, and the collision surfaces of the first protrusion 51 and the second protrusion 52 are designed to be concave and convex arranged surfaces in the second direction Y. This design can further protect the device. The above-mentioned first protrusion 51 and the second protrusion 52 are, for example, plastic materials or soft glue or damping glue, etc. In other embodiments, the supporting body 5 directly impacts the first limiting portion 22 with one side surface thereof and the first limiting portion 22 , and directly impacts the second limiting portion 23 with one side surface thereof.

[0030] Similarly Figure 4-Figure 5 As shown, a motion guide mechanism is also provided between the carrier 2 and the supporting body 5. In this embodiment, the motion guide mechanism is composed of a plurality of balls 50, thereby reducing the friction between the carrier 2 and the supporting body 5, so that the relative sliding between the two is smoother. Similarly, the plurality of balls 50 between the carrier 2 and the supporting body 5 can be generally arranged in a triangular structure to achieve a balance between stability and friction. A ball 50 is provided between the supporting body 5 and the horizontal connecting portion 25 on one side along the first direction X, and two balls 50 arranged along the optical axis Z direction are provided between the supporting body 5 and the connecting portion 25 on the other side along the first direction X.

[0031] Among them, the lens driving device is also provided with a first driving mechanism 6 for driving the carrier 2 to move axially along the optical axis Z, and a second driving mechanism 7 for driving the supporting body 5 to move axially along the optical axis Z; the first driving mechanism 6 is distributed on one side of the optical axis Z along the first direction X, and the second driving mechanism 7 is distributed on the other side of the optical axis Z along the first direction X. The first driving mechanism 6 and the second driving mechanism 7 can be electromagnetically driven or piezoelectrically driven. For example, the first driving mechanism 6 includes a first driving magnet 61 and a first driving coil 62, either of which is arranged on the base 1, and the remaining one is arranged on the carrier 2. The second driving mechanism 7 includes a second driving magnet 71 and a second driving coil 72, either of which is arranged on the base 1, and the remaining one is arranged on the supporting body 5.

[0032] In particular, in this embodiment, the first drive coil 62 and the second drive coil 72 are arranged on opposite sides of the base 1 to facilitate the layout of the circuit, and the first drive magnet 61 is arranged on the side of the carrier 2 close to the first drive coil 62 and is distributed at intervals, and the second drive magnet 71 is arranged on the side of the carrier 5 close to the second drive coil 72 and is distributed at intervals, and the above-mentioned first drive magnet 61 and the second drive magnet 71 are based on the Halbach magnet array and are optimized according to the stroke magnet arrangement to enhance the magnetic field strength. At the same time, in order to cooperate with the magnets, the first drive coil 62 and the second drive coil 72 are set to a single coil or a combination of two coils to provide a stable driving force stroke.

[0033] In order to improve the driving force and meet the driving requirements of long stroke, the thickness of the first driving magnet 61 between the first limit part 22 and the second limit part 23 in the first direction X is less than the thickness of at least part of the rest of the first driving magnet 61. In this embodiment, the first driving magnet 61 and the second driving magnet 71 both include a first magnetic block, a second magnetic block, a third magnetic block, a fourth magnetic block, and a fifth magnetic block arranged along the optical axis direction and coplanar with the first driving coil 62 and the second driving coil 72, respectively. The first magnetic block, the third magnetic block, and the fifth magnetic block are all magnetized in the first direction X, and form SNS-arranged magnetic poles on the side facing the first driving coil 62 and the second driving coil 72, respectively. The second magnetic block and the fourth magnetic block are magnetized in the optical axis Z direction. In other embodiments, the first driving magnet 61 and the second driving magnet 71 each include three magnetic blocks, the magnetic block located in the middle along the optical axis Z direction is magnetized along the Z axis direction, and the two magnets on both sides are magnetized along the first direction X.

[0034] The thickness of the first magnetic block and the second magnetic block in the first driving magnet 61 along the first direction X is greater than the thickness of the third magnetic block, the fourth magnetic block and the fifth magnetic block along the first direction X. At the same time, a part of the third magnetic block is installed on one side of the carrier 2, and the other part extends to the vertical connection part. The first driving magnet 61 also includes a supplementary magnetic block located on the side of the third magnetic block away from the first driving coil 62. The supplementary magnetic block is close to the side of the third magnetic block away from the second limiting portion 23. The supplementary magnetic block is also magnetized in the first direction X. The facing surfaces of the supplementary magnetic block and the third magnetic block have opposite magnetic poles. The sum of the thickness of the supplementary magnetic block and the third magnetic block along the first direction X is the same as the thickness of the second magnetic block along the first direction X. In the actual implementation process, the length of each magnetic block along the optical axis Z direction can be adjusted, so that it is possible to adjust whether the stronger part of the electromagnetic output is in the middle position or at the tail end. In other embodiments, such as Fig.15 As shown, at least part of the first driving magnet 61 includes at least two groups of magnets arranged along the first direction X, and the two groups of magnets have different lengths in the optical axis Z direction.

[0035] At the same time, a stroke extension arm 53 extending along the optical axis Z direction is provided on the side of the carrier 5 away from the first drive coil 62. The design of the stroke extension arm 53 can make the volume of the entire lens driving device more compact. At the same time, a avoidance position 24 for avoiding the stroke extension arm 53 is provided on the side of the carrier 2 away from the first drive coil 62. In the first direction X, the stroke extension arm 53 and the carrier 2 have overlapping parts. Specifically, at least part of the second drive magnet 71 is fixed to one side of the carrier 5, and the remaining part of the second drive magnet 71 is fixed to the stroke extension arm 53. It can also be understood that: the first magnetic block to the fifth magnetic block in the second drive magnet 71 are fixed to the stroke extension arm 53 and one side of the carrier 5 in sequence. The purpose of setting the stroke extension arm 53 is not only to make the carrier 5 adapt to the long stroke distance of the carrier 2, but also to carry the second drive magnet 71, which is conducive to optimizing the internal space layout of the device. The distribution length of the second driving coil 72 is longer than that of the second driving magnet 71, achieving a larger overall stroke and improving the driving force; and the length of the entire lens driving device in the axial direction of the optical axis Z can be greatly reduced for application in terminals with very limited installation space.

[0036] In this embodiment, a buffer mechanism is provided between the carrier 2 and the base 1 in the optical axis Z direction, thereby reducing the impact between the components and increasing the service life of the device. The buffer mechanism is, for example, an outwardly protruding portion to reduce the contact surface.

[0037] In addition, the lens driving device also includes a prism driving mechanism (existing technology) and a mounting position for carrying the lens group G1. The prism driving mechanism is arranged on the incident light side of the carrier 2, and the mounting position is between the prism driving mechanism and the carrier.

[0038] like Figure 7-Figure 9 As shown, the lens driving device of this embodiment further includes a guide mechanism disposed between the lens driving base and the carrier. The guide mechanism includes a linear guide shaft 3 fixed to the base 1 and slidingly matched with the carrier 2. Specifically, as shown in FIG. Fig.10 As shown, a sliding fit groove 21 is provided on the carrier 2 for sliding fit with the linear guide shaft 3. The sliding fit between the carrier 2 and the linear guide shaft 3 through the provided sliding fit groove 21 can ensure the stability of the carrier 2 during movement and reduce deviation and vibration. There is at least one sliding fit groove 21. In the present embodiment, two sliding fit grooves 21 are preferably provided, and the two sliding fit grooves 21 are respectively provided on a side of the above-mentioned carrier 2 close to the base 1 (distributed along the optical axis).

[0039] A reference positioning groove 11 for carrying at least a portion of the axial direction of the linear guide shaft 3 is provided on the base 1, and a guide mechanism is provided between the carrier 2 and the base 1, so that the device and the linear sliding of the carrier 2 can be assembled and adjusted more quickly, which greatly saves time and cost. The sliding matching groove 21 and the reference positioning groove 11 are both V-shaped grooves, and the linear guide shaft 3 and the sliding matching groove 21 are in tangential movable contact, and the linear guide shaft 3 and the reference positioning groove 11 are in tangential contact. In other embodiments, the sliding matching groove 21 and the reference positioning groove 11 are respectively a groove continuous along the optical axis Z direction.

[0040] Among them, Figure 5 As shown, the guide mechanism also includes a rolling member 4 located on the other side of the carrier 2 along the first direction X. The rolling member 4 is, for example, a ball. At least a portion of the rolling member 4 is in rolling contact with the base 1, and the remaining portion of the rolling member 4 is in rolling contact with the carrier 2. The rolling member 4 and the linear guide shaft 3 are respectively arranged on both sides of the carrier 2. Their function is not only to maintain the balanced movement of the carrier 2, but also to assist the movement of the carrier 2 so that the carrier 2 will not be offset during the movement. Specifically, the rolling member 4 is at least one rolling ball, and the rolling member 4 and the two sliding fitting grooves 21 form a triangular distribution. Through the configuration of the triangular distribution, the overall stability of the base 1 and the carrier 2 can be improved. Compared with the linear four-sided arrangement, the triangular distribution has higher strength, can effectively resist external interference and reduce friction, and maintain precise positioning and sliding fitting relationship.

[0041] At least a portion of the rolling member 4 is in rolling contact with the first V-shaped groove on the base 1 , and the remaining portion of the rolling member 4 is in rolling contact with the second V-shaped groove on the carrier 2 .

[0042] like Figure 8 and Fig.12 As shown, a deeper avoidance groove 10 is also provided on the base 1, and the deeper avoidance groove 10 is also V-shaped. Fig. 9 and Fig.13As shown, the deepened avoidance groove 10 is located between the two reference positioning grooves 11, at least a portion of the linear guide shaft 3 located between the retaining sleeve 120 and the reference positioning groove 11 is suspended in the deepened avoidance groove 10, and the deepened avoidance groove 10 is a stepped deepening groove, and the depth gradually deepens from the two reference positioning grooves 11 in the opposite direction.

[0043] like Fig.10 As shown, similarly, on the carrier 2 , a deepened avoidance groove 10 is provided between at least two sliding fitting grooves 21 .

[0044] The design of deepening the avoidance groove 10 can make the installation reference of the linear guide shaft 3 more accurate. At the same time, deepening the avoidance groove 10 can also form an avoidance with the carrier 2 to reduce the matching contact surface between the carrier 2 and the linear guide shaft 3 and improve the movement smoothness and stability of the carrier 2.

[0045] The axial spacing distance between the two sliding matching grooves 21 on the linear guide shaft 3 is smaller than the axial spacing distance between the two reference positioning grooves 11 on the linear guide shaft 3. The arrangement makes the contact surface between the linear guide shaft 3 and the sliding matching grooves 21 and the reference positioning grooves 11 is an isosceles trapezoid. This design can make the pressure distribution on the contact surface more uniform. Compared with other shapes, the contact point of the trapezoid can effectively reduce the concentrated stress, thereby reducing the risk of wear and damage.

[0046] Specifically, the linear guide shaft 3 has a special installation state in the sliding fitting groove 21, and the middle part of the reference positioning groove 11 has an inwardly recessed deepened avoidance groove 10. Therefore, the linear guide shaft 3 is suspended in the sliding fitting groove 21, and the axial ends of the linear guide shaft 3 are respectively extended outside the reference positioning groove 11. The purpose is to enable the linear guide shaft 3 to be stably fixed on the base 1. To a certain extent, the suspended design also avoids the carrier 2 from approaching the deepened avoidance groove 10 on the base 1.

[0047] At the same time, since the end of the linear guide shaft 3 is not limited by the reference positioning groove 11, a variety of fixing methods can be used to fix the linear guide shaft 3. The advantage of this method is that the linear guide shaft 3 can be uniformly positioned at multiple locations on the base 1 and the two ends can be disassembled and maintained in a detachable manner.

[0048] A retaining structure 12 is provided on the base 1 so that at least a portion of the axial direction of the linear guide shaft 3 is always in static contact with the reference positioning groove 11. At least a portion of the retaining structure 12 is sleeved and connected to one of the axial end sections of the linear guide shaft 3. The remaining portion of the retaining structure 12 is pressed against the other axial end section of the linear guide shaft 3 with the notch of the reference positioning groove 11 toward the bottom of the groove. The retaining structure 12 ensures the fixed stability of the linear guide shaft 3 and reduces the shaking and axial displacement that occur during the movement by connecting with the linear guide shaft 3. At the same time, the remaining portion of the retaining structure 12 keeps the linear guide shaft 3 in a relatively static state with the reference positioning groove 11 at all times, preventing unnecessary vibration to the linear guide shaft 3 from the outside, and makes at least a portion of the linear guide shaft 3 in a straight state, thereby ensuring the smoothness of the movement of the carrier 2.

[0049] Specifically, Figure 3 and Figure 7 As shown, the retaining structure 12 includes a retaining sleeve 120 provided on the base 1, and the retaining sleeve 120 is, for example, integrally formed with the base 1, one of the axial end sections of the linear guide shaft 3 is inserted into the retaining sleeve 120 and the two are fixed by glue, and the retaining structure 12 also includes a retaining frame 121 pressed on the other axial end section of the linear guide shaft 3. It is particularly noted that the above-mentioned retaining frame 121 is at least partially block-shaped and the retaining frame 121 and the other axial end section of the linear guide shaft 3 are in tangential contact, wherein the linear guide shaft 3 and the retaining sleeve 120 are fixedly connected, and the retaining sleeve 120 can prevent the linear guide shaft 3 from being offset in the axial direction and prevent the linear guide shaft 3 from rotating around the axis after being fixed. The advantage is that the retaining sleeve 120 is provided on the base 1, and its shape is a hole. During the installation process, the linear guide shaft 3 passes through the retaining sleeve 120 into the base, and the two ends of the linear guide shaft 3 are respectively fixedly connected to the retaining sleeve 120 and the retaining frame 121. In other embodiments, the retaining frame 121 may also be a hole for inserting the other end of the linear guide shaft 3 , and the hole diameter of the hole is interference fit with the linear guide shaft 3 .

[0050] like Figure 7 and 11 As shown, the retaining frame 121 has an embedding portion 1210 embedded in the base 1, and a limiting boss 13 is provided on the above-mentioned base 1, and an embedding groove 14 is also provided on the limiting boss 13 to enable the embedding portion 1210 to be embedded in cooperation, wherein the embedding portion 1210 and the base 1 are fixed by gluing or the base 1 is injection molded and the embedding portion 1210 is embedded.

[0051] The retaining frame 121 and the embedding portion 1210 form a U-shape, for example, the structure is obtained by directly molding a metal material to facilitate mass production.

[0052] In this embodiment, a reduced diameter portion is provided at one end of the linear guide shaft 3 close to the retaining frame 121 , and the reduced diameter portion is cylindrical and tangentially contacts the retaining frame 121 . The reduced diameter portion is provided to improve the efficiency of pre-insertion into the retaining sleeve 120 .

[0053] The design principle of this embodiment is as follows: The base 1 is formed by injection molding, and the reference positioning groove 11 on the base 1 is directly formed during the injection molding. Injection molding can ensure high-precision dimensional stability so that at least two reference positioning grooves 11 are in the same straight line and the groove walls of the reference positioning grooves 11 are flush. On this basis, at least part of the cross-section of the linear guide shaft 3 is placed in the reference positioning groove 11 to form a section where the linear guide shaft 3 and the sliding matching groove 21 are matched, which is at least in a straight line. At the same time, the retaining structure of this embodiment can form a reverse compression of the linear guide shaft 3 after bearing the load to prevent the linear guide shaft 3 from bending and deforming, thereby extending the service life of the linear guide shaft 3.

[0054] Secondly, when the carrier 2 moves to one end of the linear guide shaft 3 and is in place, a sliding fit groove 21 and a reference positioning groove 11 are disposed opposite to each other, so that the carrier 2 and the optical component carried by it are carried by the base 1 fixed to the linear guide shaft 3. Similarly, when the carrier 2 moves to the other end of the linear guide shaft 3 and is in place, another sliding fit groove 21 and another reference positioning groove 11 are disposed opposite to each other.

[0055] Embodiment 2

[0056] Based on the lens driving device of the first embodiment, the camera module of this embodiment includes the lens driving device of the first embodiment. Fig.14 As shown, the camera module is used in electronic devices, including 3C products, such as computers, mobile smart phones (such as mobile phones and tablets, etc.) and digital cameras. In this embodiment, the module is used as a camera imaging component of a mobile smart phone.

[0057] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A lens driving device, comprising a carrier (2) that slides relative to a base (1) along an optical axis (Z), wherein a bearing moving body (5) is slidably connected to the carrier (2), characterized in that: The lens driving device further comprises a first driving mechanism (6) for driving the carrier (2) to slide along the direction of the optical axis (Z), and the supporting movable body (5) moves following the carrier (2), and a second driving mechanism (7) for driving the supporting movable body (5) to slide relative to the carrier (2) along the direction of the optical axis (Z), wherein the carrier (2) is provided with a movable body movement stroke limiting structure in the moving direction of the supporting movable body (5) along the optical axis (Z), a part of the movable body movement stroke limiting structure is located on one side of the supporting movable body (5) along the direction of the optical axis (Z), and another part of the movable body movement stroke limiting structure is located on the other side of the supporting movable body (5) along the direction of the optical axis (Z).

2. The lens driving device according to claim 1, characterized in that: The moving body movement stroke limiting structure comprises a first limiting portion (22) provided on the carrier (2) and located on one side of the supporting moving body (5) along the optical axis (Z) direction, and a second limiting portion (23) located on the other side of the supporting moving body (5) along the optical axis (Z) direction, wherein an accommodation space for the supporting moving body (5) to be placed is formed between the first limiting portion (22) and the second limiting portion (23).

3. The lens driving device according to claim 2, characterized in that: A first protrusion (51) protruding along the direction of the optical axis (Z) is provided on one end of the supporting body (5) close to the first limiting portion (22) and / or on the first limiting portion (22), and a second protrusion (52) protruding along the direction of the optical axis (Z) is provided on the second limiting portion (23) and / or on one end of the supporting body (5) close to the second limiting portion (23).

4. The lens driving device according to claim 1, characterized in that: At least part of the first driving mechanism (6) is fixed to one side of the base (1) along a first direction perpendicular to the optical axis (Z), and the remaining part of the first driving mechanism (6) is fixed to one side of the carrier (2) along the first direction perpendicular to the optical axis (Z); at least part of the second driving mechanism (7) is fixed to the other side of the base (1), and the remaining part of the second driving mechanism (7) is fixed to one side of the supporting body (5).

5. The lens driving device according to claim 4, characterized in that: One side of the supporting body (5) has a stroke extension arm (53) extending along the direction of the optical axis (Z), and the second driving mechanism (7) includes a second driving coil (72) and a second driving magnet (71) that cooperate with each other, the second driving coil (72) is fixed to the other side of the base (1), and the second driving magnet (71) is fixed to one side of the supporting body (5) and the stroke extension arm (53).

6. The lens driving device according to claim 4, characterized in that: At least one side of the carrier (2) is slidably engaged with the base (1) via a linear guide shaft (3); the carrier (2) is provided with a sliding engagement groove (21) slidably engaged with the linear guide shaft (3); and the base (1) is provided with a reference positioning groove (11) for supporting at least a portion of the axial direction of the linear guide shaft (3).

7. The lens driving device according to claim 6, characterized in that: The first driving mechanism (6) comprises a first driving coil (62) and a first driving magnet (61) which cooperate with each other. The first driving magnet (61) is arranged on one side of the carrier (2) along a first direction perpendicular to the optical axis (Z). The first driving magnet (61) and the linear guide shaft (3) are located on the same side of the carrier (2) along the first direction perpendicular to the optical axis (Z). The other side of the carrier (2) is rollingly matched with the base (1) through a rolling member (4).

8. The lens driving device according to claim 2, characterized in that: The first driving mechanism (6) comprises a first driving coil (62) and a first driving magnet (61) which cooperate with each other; the first driving magnet (61) is arranged on one side of the carrier (2) along a first direction perpendicular to the optical axis (Z); the thickness of a portion of the first driving magnet (61) located between the first limiting portion (22) and the second limiting portion (23) in the first direction is smaller than the thickness of at least a portion of the rest of the first driving magnet (61).

9. The lens driving device according to claim 8, characterized in that: At least part of the first driving magnet (61) comprises at least two groups of magnets arranged along a first direction, and the two groups of magnets have different lengths in the direction of the optical axis (Z).

10. A camera module, characterized in that: The camera module includes the lens driving device described in any one of claims 1-9.

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