Camera module and driving mechanism applied to camera module

Abstract

The invention discloses a camera module and a driving mechanism thereof, and belongs to the technical field of electronics, the driving mechanism comprises a fixed part, a movable part, a driving assembly, a guide assembly and a magnetic attraction assembly, the fixed part comprises a supporting surface, the movable part is movably connected with the fixed part and comprises a contact surface, the driving assembly is arranged between the fixed part and the movable part and provides a pre-compression force, and the magnetic attraction assembly is arranged between the fixed part and the movable part. The guide assembly is located between the supporting face and the contact face so that a fixed gap can be kept between the fixed piece and the movable piece, the magnetic attraction assembly comprises at least one set of first magnetic attraction piece and second magnetic attraction piece which are arranged on the fixed piece and the movable piece respectively, and the first magnetic attraction piece and the second magnetic attraction piece are matched to generate magnetic attraction force parallel to the pre-pressure to attract the contact face to the supporting face. The driving mechanism is applied to the camera module. The movable part can be prevented from inclining relative to the fixed part, so that the movable part is prevented from being clamped relative to the fixed part, the movable part can be smoothly adjusted, and the imaging quality is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a camera module and a driving mechanism applied to the camera module. Background Art

[0002] Electronic devices are usually equipped with camera modules. With the improvement of living standards, people pay more and more attention to the performance of camera anti-shake in order to obtain photos with higher image quality. People expect to install small-sized, high-pixel and anti-shake camera modules on portable devices such as smart phones and tablets to obtain a better user experience. In the prior art, the optical lens is set on a movable part, the movable part is movably set on a fixed part, and a piezoelectric motor is installed between the two. On the one hand, the piezoelectric motor provides pre-pressure to the movable part so that it abuts against the movable part, and on the other hand, it can drive the movable part to move relative to the fixed part through friction, thereby realizing the lens adjustment function. However, due to the existence of this pre-pressure, the movable part may tilt relative to the fixed part, causing the movable part to be stuck in a certain position, losing the lens adjustment function, and resulting in reduced imaging quality of the camera module. Summary of the invention

[0003] One purpose of the present application is to provide a driving mechanism applied to a camera module, which can prevent a movable part from tilting relative to a fixed part, thereby preventing the movable part from getting stuck relative to the fixed part.

[0004] Another object of the present application is to provide a camera module, which is beneficial to improving imaging quality because the movable parts equipped with optical lenses can be adjusted smoothly.

[0005] In order to achieve one of the purposes of this application, the technical solution adopted in this application is: a driving mechanism applied to a camera module, which includes:

[0006] a fixing member, the fixing member comprising a support surface;

[0007] A movable member, the movable member is movably disposed on the fixed member, and the movable member includes a contact surface disposed opposite to the supporting surface;

[0008] A guide assembly, the guide assembly being located between the support surface and the contact surface so as to maintain a fixed gap between the fixed member and the movable member;

[0009] A driving assembly, the driving assembly is connected to the fixing member and abuts against the movable member and provides a pre-pressure;

[0010] A magnetic attraction component, the magnetic attraction component includes at least one group of a first magnetic attraction component and a second magnetic attraction component, the first magnetic attraction component is arranged on one of the fixed component and the movable component, the second magnetic attraction component is arranged on the other of the fixed component and the movable component, the first magnetic attraction component interacts with the second magnetic attraction component to attract the contact surface of the movable component to the support surface of the fixed component, and the direction of the magnetic attraction force generated by the magnetic attraction component is parallel to the pre-pressure direction of the driving component.

[0011] Preferably, the guide assembly and the drive assembly are arranged on the same side of the movable part.

[0012] Preferably, the guide assembly comprises a first guide member and a second guide member, and the first guide member and the second guide member are both arranged adjacent to the driving assembly.

[0013] Preferably, the guide assembly, the drive assembly and the magnetic attraction assembly are all arranged on the same side of the movable part.

[0014] Preferably, the magnetic attraction component comprises a first group of magnetic attraction components and a second group of magnetic attraction components which are arranged relative to the driving component, and the first group of magnetic attraction components and the second group of magnetic attraction components are respectively arranged on both sides of the driving component.

[0015] As a preferred embodiment, along a direction parallel to the pre-pressure, the first magnetic member and the second magnetic member in the first group of magnetic components are respectively arranged on both sides of the first guide member, and the first magnetic member and the second magnetic member in the second group of magnetic components are respectively arranged on both sides of the second guide member, the first magnetic member and the second magnetic member of the first group of magnetic components attract each other, and the first magnetic member and the second magnetic member in the second group of magnetic components attract each other.

[0016] Preferably, the driving assembly includes a pre-stressing assembly and an actuating assembly, wherein the pre-stressing assembly is connected to the fixing member, and the actuating assembly is connected to the pre-stressing assembly, and the pre-stressing assembly provides the pre-stressing assembly to the actuating assembly so that the friction head of the actuating assembly abuts against one side of the movable member and applies the pre-stressing force to the movable member, and the pre-stressing force is in the same direction as the magnetic attraction force. When the actuating assembly receives a driving signal, the friction head provides a driving force to the movable member to drive the movable member to move.

[0017] Preferably, a plane passing through the center line of the pre-stressing component and extending along the pre-stressing direction is taken as a reference plane, and the first group of magnetic components and the second group of magnetic components are symmetrically arranged with respect to the reference plane.

[0018] Preferably, the pre-stressing assembly includes a structural member and a buffer member, the elastic modulus of the structural member is greater than that of the buffer member, the fixing member is provided with an opening extending from the outer wall of the fixing member to the inner wall thereof, the structural member is connected to the outer wall of the fixing member, one side of the buffer member is attached to the structural member, and the other side is attached to the actuating assembly, the buffer member and the actuating assembly thereon pass through the opening and abut against the movable member.

[0019] Preferably, along the moving direction of the movable part, the length of the first magnetic part is L, the length of the second magnetic part is Y, and the travel range of the movable part driven by the driving component is D, Y>L+D, or L>Y+D.

[0020] As a preference, it further comprises a magnetic induction component, which is arranged relative to the magnetic attraction component, so as to determine the position of the movable part by inducing changes in the magnetic field.

[0021] Preferably, the movable part is provided with an outer convex portion, which is formed by protruding from the outer side wall of the movable part in a direction away from the driving component, and the fixed part is provided with an inner convex portion, which is formed by protruding from the inner side wall of the fixed part in a direction close to the driving component. The inner convex portion is arranged opposite to the outer convex portion, the contact surface is formed on the outer convex portion, and the support surface is formed on the inner convex portion.

[0022] As a preference, the movable part is further provided with an inner recessed portion, which is formed by being recessed from the outer side wall of the movable part in a direction close to the driving component, and the outer protrusion is connected to the inner recessed portion and cooperates to form a first groove, and the inner protrusion is suitable for being inserted into the first groove, and the fixed part is provided with an outer recessed portion, which is formed by being recessed from the inner side wall of the fixed part in a direction away from the driving component, and the outer recessed portion is connected to the inner protrusion and cooperates to form a second groove, and the outer protrusion is suitable for being inserted into the second groove.

[0023] As a preference, the support surface is provided with a first guide groove and a third guide groove, and the contact surface is provided with corresponding second guide groove and fourth guide groove, the first guide groove and the second guide groove cooperate to clamp the first guide member therein, the third guide groove and the fourth guide groove cooperate to clamp the second guide member therein, and the first guide member and the second guide member keep the support surface and the contact surface parallel.

[0024] In order to achieve another purpose of the present application, the technical solution adopted in the present application is: a camera module, which includes:

[0025] Optical lens;

[0026] A photosensitive component arranged relative to the optical lens; and

[0027] In the above-mentioned driving mechanism, the optical lens is arranged on the movable part.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] (1) The magnetic attraction of the magnetic attraction assembly makes the contact surface of the movable part tend to move toward the support surface of the fixed part, so that the contact surface and the support surface can cooperate to clamp the guide assembly, and the clamping is stable and reliable, realizing the tight assembly between the fixed part, the movable part and the guide assembly;

[0030] (2) When the movable part tilts under the pre-pressure and driving force of the driving assembly, the magnetic attraction can act on the movable part so that the position of the movable part is corrected in time, thereby maintaining the parallelism between the supporting surface and the contact surface, that is, the movable part is prevented from tilting when moving along the optical axis, and the movable part can move smoothly along the optical axis. The movable part equipped with an optical lens can smoothly adjust its position, which is conducive to improving the imaging quality;

[0031] (3) The magnetic component has a simple structure and low cost;

[0032] (4) The magnetic attraction and preload are in the same direction, so the movable part can be supported parallel to the fixed part at the same time;

[0033] (5) Adding a guide component to reduce the friction contact area between the movable part and the fixed part helps to reduce the friction force on the movable part when it moves relative to the fixed part, making it easier for the movable part to be driven. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of a driving mechanism in the prior art;

[0035] Figure 2 It is a schematic diagram of the pre-pressure inclination;

[0036] Figure 3 This is a schematic diagram of the three-dimensional structure of a driving mechanism in a preferred embodiment of the present application;

[0037] Figure 4 This is a schematic diagram of the exploded structure of the driving mechanism in a preferred embodiment of the present application;

[0038] Figure 5 A top view of a driving mechanism in a preferred embodiment of the present application;

[0039] Figure 6 for Figure 5 Cross-sectional view in the BB direction;

[0040] Figure 7A top view of a movable part in a preferred embodiment of the present application;

[0041] Figure 8 A top view of a fixing member in a preferred embodiment of the present application;

[0042] Fig. 9 A top view of a driving mechanism in another preferred embodiment of the present application;

[0043] Fig.10 for Fig. 9 Cross-sectional view in CC direction;

[0044] Fig.11 This is a schematic diagram of the three-dimensional structure of a driving component in a preferred embodiment of the present application;

[0045] Fig.12 This is a schematic diagram of the structure of the friction-resistant plate in a preferred embodiment of the present application;

[0046] Fig.13 This is a structural schematic diagram of a pre-pressing assembly in another preferred embodiment of the present application;

[0047] Fig.14 for Fig.13 A schematic cross-sectional structure diagram of the pre-pressing assembly shown;

[0048] Fig.15 This is a schematic diagram of the structure of a driving mechanism in another embodiment of the present application;

[0049] Fig.16 This is a schematic diagram of the structure of a driving mechanism in another embodiment of the present application;

[0050] In the figure: O, center axis; P, preload; F, driving force; N, supporting force; f1, friction force; 10, fixing member; 11, supporting surface; 111, first guide groove; 112, third guide groove; 12, first inner side wall; 13, second inner side wall; 14, third inner side wall; 15, fourth inner side wall; 16, outer recess; 161, first outer recess; 162, second outer recess; 17, inner protrusion; 171, first inner protrusion; 172, second inner protrusion; 173, mounting groove; 18, second groove; 181, second groove one; 182, second groove two; 19, opening; 20, movable member; 21, contact surface; 211, second guide groove; 212, fourth guide groove; 22, first outer side wall; 23, second outer side wall; 24, third outer side wall; 25, fourth outer side wall; 26, inner recess; 261, first inner recess; 262, second inner concave portion; 27, outer convex portion; 271, first outer convex portion; 272, second outer convex portion; 273, receiving groove; 28, first groove; 281, first groove 1; 282, first groove 2; 29, friction plate; 30, driving assembly; 31, pre-pressing assembly; 311, main body; 312, fixing portion; 313, structural member; 3131, third side surface; 314, buffer member; 3141, The first side surface; 3142, the second side surface; 32, the actuator assembly; 321, the piezoelectric circuit board; 322, the piezoelectric vibrator; 323, the friction head; 40, the guide assembly; 41, the first guide member; 42, the second guide member; 43, the ball; 44, the guide rod; 50, the magnetic assembly; 51, the second magnetic member; 52, the first magnetic member; 53, the magnetic induction member; 54, the first group of magnetic assemblies; 55, the second group of magnetic assemblies. DETAILED DESCRIPTION

[0051] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0052] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0053] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0054] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0055] The present application provides a driving mechanism for a camera module, such as Figures 3 to 16 As shown, it includes a fixed part 10, a movable part 20, a driving assembly 30 and a guiding assembly 40. The movable part 20 is movably connected to the fixed part 10. The driving assembly 30 abuts against the movable part 20 and provides a pre-pressure P. When the driving assembly 30 receives a driving signal, it can rub against the movable part 20 under the action of the pre-pressure P, thereby driving the movable part 20 to move. The guiding assembly 40 is arranged between the fixed part 10 and the movable part 20, so that there is a fixed gap between the opposite surfaces of the fixed part 10 and the movable part 20, which can reduce the friction force on the movable part 20 when it moves relative to the fixed part 10.

[0056] In the present application, the driving mechanism has a central axis O, and the movable member 20 is movably disposed in the fixed member 10 and is suitable for moving along the central axis O direction.

[0057] In this embodiment, the movable part 20 is movably arranged in the fixed part 10, and an optical lens is carried on the movable part 20. The optical lens has an optical axis, and the direction of the central axis O is parallel to the optical axis direction of the optical lens. The movable part 20 can move along the optical axis direction relative to the fixed part 10, thereby driving the optical lens to move along the optical axis direction to realize the optical focusing function.

[0058] In some other embodiments, the movable member 20 may move relative to the fixed member 10 in a direction perpendicular to the optical axis, thereby realizing an optical image stabilization function.

[0059] In some embodiments, the driving component 30 is specifically implemented as a piezoelectric motor. The piezoelectric motor is a motor with fast response, large driving force and high driving accuracy, which can be used in the camera module. Specifically, the driving component 30 includes a pre-stressing component 31 and an actuating component 32. The pre-stressing component 31 is connected to the fixing member 10, and the actuating component 32 is connected to the pre-stressing component 31. The pre-stressing component 31 provides a pre-stressing force P perpendicular to the direction of the central axis O to the actuating component 32, so that the actuating component 32 abuts against one side of the movable part 20. The actuating component 32 provides a driving force F to the movable part 20 to guide the movable part 20 to move along the direction of the central axis O.

[0060] In some embodiments, the actuating assembly 32 includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 is connected to the pre-pressing assembly 31. The friction head 323 is fixed to the side of the piezoelectric vibrator 322 facing the movable part 20. The friction head 323 abuts against the side wall of the movable part 20 under the action of the pre-pressing force P, that is, the friction head 323 and the pre-pressing assembly 31 are respectively arranged on opposite sides of the piezoelectric vibrator 322. The friction head 323 is moved by the high-frequency micro-amplitude vibration of the piezoelectric vibrator 322, and the friction between the friction head 323 and the outer wall of the movable part 20 is used to drive the movable part 20 to move in a straight line along the central axis O. In other words, the driving force F can actually be understood as the friction force applied by the friction head 323 to the movable part 20.

[0061] In some embodiments, the actuator assembly 32 also includes a piezoelectric circuit board 321, which is specifically a flexible circuit board, i.e., an FPC. The piezoelectric circuit board 321 is connected to the piezoelectric vibrator 322 to supply power to the piezoelectric vibrator 322. Specifically, the piezoelectric circuit board 321 can be set on the side of the piezoelectric vibrator 322 facing away from the movable part 20.

[0062] In some embodiments, the pre-stressing assembly 31 is disposed on a side of the piezoelectric vibrator 322 facing away from the movable part 20 , so as to provide a pre-stressing force P toward the movable part 20 to the friction head 323 disposed on a side of the piezoelectric vibrator 322 facing the movable part 20 .

[0063] The guide assembly 40 is arranged between the movable part 20 and the fixed part 10. One side of the guide assembly 40 abuts against the fixed part 10, and the other side abuts against the movable part 20, and applies a supporting force N perpendicular to the direction of the central axis O to the movable part 20. The supporting force N can cooperate with the pre-pressure P applied by the driving assembly 30 to the movable part 20, so that the movable part 20 is clamped between the guide assembly 40 and the fixed part 10, and the movable part 20 can move along the direction of the central axis O under the action of the driving force F of the actuating assembly 32, that is, the driving assembly 30 and the guide assembly 40 cooperate to guide the movable part 20 to move along the direction of the central axis O. In addition, if the movable part 20 is in surface contact with the fixed part 10, the movable part 20 will be subjected to greater friction resistance when moving, affecting the driving effect. The guide assembly 40 can change the contact mode between the movable part 20 and the fixed part 10, such as point contact and line contact, reduce the friction contact area between the movable part 20 and the fixed part 10, and help reduce the friction force f1 that the movable part 20 is subjected to when moving relative to the fixed part 10.

[0064] It should be understood that in one embodiment of the present application, Fig.10 , Fig.11 As shown, the guide assembly 40 can be implemented as a ball 43. Under the action of the preload assembly 31, a plurality of balls 43 are clamped between the movable part 20 and the fixed part 10, and the ball 31 is in point contact with the movable part 20 and the fixed part 10. In another embodiment of the present application, considering that 1) the ball 43 is in point contact with the movable part 20 and the fixed part 10, when the movable part 20 is tilted, a large inclination angle may be generated between the movable part 20 and the ball 43, causing the ball 43 to get stuck and sliding friction to occur; 2) the ball 43 will switch between the rolling state and the sliding state at will during movement, increasing the risk of the movable part 20 getting stuck; 3) the movable part 20 and the ball 43 fall off, or the debris generated by friction, impact or other reasons between the ball 43 and the movable part 20 and the fixed part 10 may cause the ball 43 to get stuck, and then the movable part 20 to get stuck. These situations will make the movable part 20 unable to continue to move, affecting the focusing effect. For this reason, if Figures 4 to 7 As shown, the guide assembly 40 can be implemented as a guide rod 44. Under the action of the pre-stressing assembly 31, multiple guide rods 44 are clamped between the movable part 20 and the fixed part 10. There is line contact between the guide rod 44 and the movable part 20 and the fixed part 10, which reduces the risk of jamming compared to the ball 43.

[0065] It is understandable that if Figure 2As shown, the piezoelectric vibrator 322 causes the friction head 323 to move by deformation, and when the piezoelectric vibrator 322 is deformed, the angle between the friction head 323 and the abutting surface of the movable part 20 changes accordingly, resulting in the pre-pressure P not acting perpendicularly on the side wall of the movable part 20, but the direction of the pre-pressure P has a certain inclination relative to the plane where the side wall of the movable part 20 is located. At the same time, when the hardness of the pre-pressure component 31 is relatively small, the pre-pressure component 31 may bend to a certain extent due to the deformation of the piezoelectric vibrator 322, resulting in the direction of the pre-pressure P relative to the angle of the abutting surface. That is to say, under certain circumstances, the direction of the pre-pressure P is inclined relative to the plane where the side wall of the movable part 20 is located. In this case, when the actuating component 32 drives the movable part 20 to move, it is easy to cause the movable part 20 to tilt.

[0066] In particular, in some embodiments, Figure 1 As shown, the guide assembly 40 is arranged at two diagonal positions of the movable part 20. From a top view, the guide assembly 40 arranged at two diagonal positions of the movable part 20 and the actuating assembly 32 are arranged at three points on the side wall of the movable part 20. The distance from the center position where the actuating assembly 32 and the movable part 20 are in friction contact to the connecting line of the guide assembly 40 arranged at two diagonal positions is the lever arm x. The magnitude of the overturning moment M of the movable part 20 at the diagonal position is positively correlated with the magnitude of the lever arm x. The three-point arrangement makes the lever arm x and the overturning moment M larger. When the movable part 20 is driven by the actuating assembly 32 to move along the central axis O, the movable part 20 will have a larger inclination angle, causing the movable part 20 to tilt, affecting the speed and effect of optical focusing. In addition, in the structure in which the guide assembly 40 is arranged at a diagonal position, the two diagonal guide assemblies 40 may generate uncertain friction force, causing the moving stroke and moving speed of the movable part 20 to fail to meet the standards. Moreover, the diagonal guide assembly 40 may squeeze the driving assembly 30, causing the friction force of the guide assembly 40 to increase.

[0067] Furthermore, when the guide assembly 40 is implemented as a ball 43, it is possible that the movable member 20 and the ball 43 are stuck, or the movable member 20 and the ball 43 fall off, so that the movable member 20 cannot continue to move, affecting the focusing effect. Of course, when the guide assembly 40 is implemented as a guide rod 44, the situation will be better than the ball 43, but the tilt of the movable member 20 will also affect the optical focusing effect.

[0068] To solve the above problem, in one embodiment of the present application, the guide assembly 40 and the drive assembly 30 are arranged on the same side of the movable member 20, such as Figures 3 to 6As shown, compared with the arrangement of two guide assemblies 40 and the friction head 323 of the actuating assembly 32 at three points on the side wall of the movable part 20, the arrangement of the guide assembly 40 and the driving assembly 30 on the same side of the movable part 20 reduces the distance from the friction head 323 of the actuating assembly 32 to the connecting line between the two guide assemblies 40, that is, x becomes smaller, thereby reducing the torque M. When the movable part 20 is driven by the actuating assembly 32 to move along the direction of the central axis O, the inclination angle of the movable part 20 is small, so that the risk of the movable part 20 tilting is reduced, thereby avoiding affecting the optical focusing effect.

[0069] But inevitably, in the case of pre-pressure P tilting, due to the existence of the assembly gap, the movable part 20 is still likely to tilt. Here, the assembly gap refers to the gap reserved for the movable part 20 and the guide assembly 40 to be assembled in the fixed part 10. Through this assembly gap, the movable part 20 and the guide assembly 40 can be assembled in the fixed part 10, but also leave space for the movable part 20 to tilt. And in some cases, due to the manufacturing tolerances of the fixed part 10, the movable part 20, and the guide assembly 40, and the influence of other factors in the processing and assembly process, the assembly between the guide assembly 40 and the fixed part 10 and the movable part 20 may not be tight enough, resulting in a greater possibility of tilting of the movable part 20. Once the movable part 20 tilts to a certain extent, the guide assembly 40 will be stuck between the movable part 20 and the fixed part 10, making the movable part 20 unable to move to achieve the optical focusing function.

[0070] To this end, the present application improves the structure of the driving mechanism and proposes a driving mechanism applied to a camera module: Figures 3 to 14 As shown, it includes a fixed member 10, a movable member 20, a driving assembly 30, a guide assembly 40 and a magnetic attraction assembly 50. The fixed member 10 includes a supporting surface 11, the movable member 20 is movably arranged on the fixed member 10, and the movable member 20 includes a contact surface 21. The supporting surface 11 and the contact surface 21 are arranged opposite to each other. The guide assembly 40 is located between the supporting surface 11 and the contact surface 21, so that a fixed gap is maintained between the fixed member 10 and the movable member 20. The driving assembly 30 is connected to the fixed member 10, and at the same time abuts against the movable member 20 and provides a pre-pressure P. The magnetic attraction assembly 50 includes at least one set of pairs of A second magnetic component 51 and a first magnetic component 52 are arranged, the first magnetic component 52 is arranged on one of the fixed component 10 and the movable component 20, and the second magnetic component 51 is arranged on the other of the fixed component 10 and the movable component 20. The first magnetic component 52 interacts with the second magnetic component 51 to attract the contact surface 21 of the movable component 20 to the support surface 11 of the fixed component 10, that is, the first magnetic component 52 and the second magnetic component 51 can attract each other to generate a magnetic force, so that the contact surface 21 and the support surface 11 remain in contact with the guide component 40, thereby keeping the contact surface 21 parallel to the support surface 11.

[0071] The magnetic attraction of the magnetic attraction component 50 makes the contact surface 21 of the movable part 20 have a tendency to move toward the support surface 11 of the fixed part 10, so that the contact surface 21 and the support surface 11 can cooperate to clamp the guide component 40, and the clamping is stable and reliable, realizing the tight assembly between the fixed part 10, the movable part 20, and the guide component 40. When the movable part 20 tilts under the action of the pre-pressure P of the driving component 30, the magnetic attraction can act on the movable part 20 so that the position of the movable part 20 is corrected in time, thereby maintaining the mutual parallelism between the support surface 11 and the contact surface 21, that is, the movable part 20 is prevented from tilting when moving, and the movable part 20 can move smoothly along the central axis O of the driving component, and the magnetic attraction component 50 has a simple structure and low use cost.

[0072] Furthermore, the magnetic attraction force is in the same direction as the pre-pressure P, and the movable part 20 can be supported in parallel on the fixed part 10 at the same time. In other words, the second magnetic attraction part 51 and the first magnetic attraction part 52 are arranged relatively along the direction of the pre-pressure P to avoid the pre-pressure P generating a component force in a direction perpendicular to the central axis O, causing the movable part 20 to be displaced under the action of the component force and affecting the camera function. Even in the case where the pre-pressure P is inclined, the component force that is not perpendicular to the abutment surface between the friction head 323 and the movable part 20 is difficult to cause the movable part 20 to tilt, thereby keeping the relative surfaces of the movable part 20 and the fixed part 10 parallel to each other. It should be supplemented that, in some embodiments, when the guide assembly 40 is provided with a plurality of support members, due to the action of the magnetic attraction assembly 50, the support surface 11 and the contact surface 21 can clamp each support member, which is conducive to improving the parallelism between different support members, thereby reducing the assembly tolerance of the drive mechanism and ensuring the stable operation of the drive mechanism.

[0073] Based on the setting of the magnetic attraction component 50, the present application can provide an embodiment, such as Fig.15 As shown, two guide assemblies 40 are arranged at two diagonal corners of the movable part 20, and the driving assembly 30 and the two guide assemblies 40 are arranged at three points on the side wall of the movable part 20. It can be understood that due to the existence of magnetic attraction, when the pre-pressure P is inclined, although the overturning moment M is large, the magnetic attraction can offset part or all of the component force of the pre-pressure P that is not perpendicular to the contact surface between the friction head 323 and the movable part 20, thereby reducing the possibility of the movable part 20 being tilted.

[0074] The present application can also provide an embodiment, such as Fig.16 As shown, the guide assembly 40 and the drive assembly 30 are arranged on opposite sides of the movable part 20. In this case, the overturning moment M of the movable part 20 is also large, but the magnetic attraction force can offset part or all of the component force of the prepressure P that is not perpendicular to the abutment surface between the friction head 323 and the movable part 20, thereby reducing the possibility of the movable part 20 tilting.

[0075] Combination Figure 4 , Figures 8 to 10 The present application further describes the structure of the magnetic attraction assembly 50 . In the present embodiment, the guide assembly 40 and the drive assembly 30 are arranged on the same side of the movable part 20 to reduce the moment M and reduce the risk of the movable part 20 tilting.

[0076] Specifically, in some embodiments, the guide assembly 40 includes a first guide member 41 and a second guide member 42, and the first guide member 41 and the second guide member 42 are both arranged adjacent to the drive assembly 30. More specifically, the movable member 20 includes a first outer wall 22, a second outer wall 23, and a third outer wall 24 connected in sequence, and the first outer wall 22 and the third outer wall 24 are arranged oppositely, the fixed member 10 includes a first inner wall 12, a second inner wall 13, and a third inner wall 14 connected in sequence, the drive assembly 30 is arranged between the second inner wall 13 and the second outer wall 23, the first inner wall 12 is arranged oppositely to the first outer wall 22, and the third inner wall 14 is arranged oppositely to the third outer wall 24, the first guide member 41 is arranged between the first outer wall 22 and the first inner wall 12, and is arranged on a side relatively close to the drive assembly 30, the second guide member 42 is arranged between the second outer wall 23 and the second inner wall 13, and the first guide member 41 and the second guide member 42 are arranged oppositely.

[0077] Furthermore, the guide assembly 40, the drive assembly 30 and the magnetic attraction assembly 50 are all arranged on the same side of the movable part 20, and the several structures that apply force to the movable part 20 are arranged relatively concentratedly, which is conducive to maintaining a compact structure.

[0078] In some embodiments, the magnetic attraction component 50 includes a first group of magnetic attraction components 54 and a second group of magnetic attraction components 55 arranged relative to the driving component 30, and the first group of magnetic attraction components 54 and the second group of magnetic attraction components 55 are respectively arranged on both sides of the driving component 30. The magnetic attraction force can be provided to the movable part 20 from both sides, and the magnetic attraction force has a better effect.

[0079] In some embodiments, the position of the magnetic attraction component 50 is related to the position of the guide component 40, and the magnetic attraction component 50 is arranged adjacent to the guide component 40. Specifically, the first group of magnetic attraction components 54 is arranged adjacent to the first guide member 41, and the second group of magnetic attraction components 55 is arranged adjacent to the second guide member 42, so that the torque between the magnetic attraction force and the guide component is relatively small, the magnetic attraction force can act more directly on the guide component 40, and the utilization rate of the magnetic attraction force is high.

[0080] In a specific embodiment of the present application, along the direction parallel to the pre-pressure P, the first magnetic component 52 and the second magnetic component 51 in the first magnetic component 54 are respectively arranged on both sides of the first guide member 41, and the first magnetic component 52 and the second magnetic component 51 in the second magnetic component 55 are respectively arranged on both sides of the second guide member 42, and the first magnetic component 52 and the second magnetic component 51 in the first magnetic component 54 attract each other, and the first magnetic component 52 and the second magnetic component 51 in the second magnetic component 55 attract each other. That is, the first magnetic component 54 and the first guide member 41 are arranged in a colinear manner, and the second magnetic component 55 and the second guide member 42 are arranged in a colinear manner, which is conducive to directly applying the magnetic attraction force to the contact surface 21 and the support surface 11, thereby clamping the guide component 40.

[0081] In some embodiments, a plane passing through the center line of the pre-pressing component 31 and extending in the direction of the pre-pressing force P is used as a reference plane, and the first group of magnetic suction components 54 and the second group of magnetic suction components 55 are symmetrically arranged about the reference plane to provide equal magnetic suction forces to both sides of the movable part 20. Specifically, the pre-pressing force P may be applied to the center of the contact side wall between the friction head 323 and the movable part 20, and the first group of magnetic suction components 54 and the second group of magnetic suction components 55 are symmetrically arranged on both sides of the pre-pressing component 31, so that the movable part 20 is subjected to symmetrical magnetic suction forces on both sides, thereby preventing the movable part 20 from tilting to one side due to the different magnitudes of the magnetic suction forces on both sides, thereby avoiding affecting the optical focus and / or optical image stabilization effect.

[0082] In some embodiments, the present application also takes into account that the movable part 20 can move relative to the fixed part 10. In order to ensure that there is always a certain magnetic attraction between the second magnetic part 51 and the first magnetic part 52 during the movement of the movable part 20, along the direction of the central axis O, the length of the second magnetic part 51 is Y, and the length of the first magnetic part 52 is L, and L is larger than Y, so that when the movable part 20 is within a certain range of motion, the area directly opposite to each other between the second magnetic part 51 and the first magnetic part 52 remains basically constant.

[0083] Furthermore, along the direction of the central axis O, the travel range of the movable part 20 driven by the driving component 30 is D, Y>L+D, or L>Y+D. Then, during the entire movement process of the movable part 20 driven by the driving component 30, the first magnetic component 52 and the second magnetic component 51 have a portion of the opposite surfaces that remain overlapped in the direction perpendicular to the central axis O. Therefore, during the movement of the movable part 20, a certain magnitude of magnetic attraction is always generated between the second magnetic component 51 and the first magnetic component 52.

[0084] In this embodiment, the length Y of the first magnetic member 52 is greater than the sum of the length L of the second magnetic member 51 and the travel range D of the movable member 20 .

[0085] Furthermore, the width of the first magnetic member 52 is greater than the width of the second magnetic member 51, and the edge of the second magnetic member 51 can be directly opposite to the inside of the first magnetic member 52. The first magnetic member 52 and the second magnetic member 51 can always generate a certain magnetic attraction between each other.

[0086] In some embodiments, the fixing member 10 is provided with a mounting groove 173, the first magnetic member 52 is installed in the mounting groove 173, the movable member 20 is provided with a receiving groove 273, and the second magnetic member 51 is installed in the receiving groove 273. The second magnetic member 51 and the first magnetic member 52 do not occupy additional space, which is conducive to keeping the structure of the entire driving mechanism compact, and the second magnetic member 51 and the first magnetic member 52 are shielded and protected by the mounting groove 173 and the receiving groove 273 respectively. Fig. 9 This is a top view of the driving mechanism in a preferred embodiment of the present application. Since the second magnetic member 51 is in the receiving groove 273 and is in a blocked state, the second magnetic member 51 is indicated by a dotted line in the figure.

[0087] In some embodiments, the second magnetic member 51 and the first magnetic member 52 are both configured in a regular block or sheet shape, with a simple structure and easy processing and forming, and it is convenient to open a corresponding shape of the receiving groove 273 or the installation groove 173.

[0088] In some embodiments, the first magnetic attraction member 52 is a magnet having magnetic attraction force, and the second magnetic attraction member 51 is an object suitable for being attracted by the magnet.

[0089] In other embodiments, the second magnetic attraction member 51 is a magnet having magnetic attraction force, and the first magnetic attraction member 52 is an object suitable for being attracted by the magnet.

[0090] It can be understood that the magnet can be a metal alloy permanent magnet, such as neodymium iron boron permanent magnet, aluminum nickel cobalt permanent magnet, or ferrite permanent magnet, or rare earth permanent magnet. Objects suitable for being adsorbed by the magnet include but are not limited to magnets and metal sheets, such as low-cost iron sheets. The second magnetic attraction component 51 and the first magnetic attraction component 52 can attract each other, and their specific materials are not limited.

[0091] In some other embodiments, the second magnetic component 51 and the first magnetic component 52 may be mutually exclusive. For example, the two are two magnets with the same polarity. It can be understood that it is necessary to adjust the installation position of the magnetic component 50 so that the magnetic force exerted by the magnetic component 50 on the movable part 20 is opposite to the pre-pressure P of the driving component 30. For example, the second magnetic component 51 can be set on the second outer wall 23 of the movable part 20, and the first magnetic component 52 can be set on the second inner wall 13 of the fixed part 10.

[0092] In some embodiments, the driving mechanism further includes a magnetic sensing component 53, which is disposed relative to the magnetic attraction component 40, so as to determine the position of the movable component 20 by sensing changes in the magnetic field.

[0093] It can be understood that the arrangement of the magnetic induction component 53 relative to the magnetic attraction component 40 means that the magnetic induction component 53 is arranged relative to the magnet. For example, when the second magnetic attraction component 51 on the movable component 20 is a magnet, the magnetic induction component 53 can be arranged on the fixed component 10 relative to the second magnetic attraction component 51 so as to detect changes in the magnetic field.

[0094] In this embodiment, the magnetic induction component 53 and the second magnetic attraction component 51 are arranged opposite to each other along a direction parallel to the prepressure P. The second magnetic attraction component 51 is a magnet. When the movable part 20 moves, the relative position between the magnetic induction component 53 and the magnet changes, and the strength of the magnetic field sensed by the magnetic induction component 53 changes, so that the current position of the movable part 20 can be determined, which is convenient for controlling the driving component 30 to adjust the position of the movable part 20.

[0095] Specifically, the magnetic induction element 53 is a Hall induction sensor, or a magnetoelectric induction sensor, or a magnetoresistive effect sensor, such as a magnetic sensitive element TMR using a tunnel magnetoresistive effect, or a chip integrated with a magnetic induction function, or other elements capable of sensing changes in a magnetic field.

[0096] In some embodiments, one magnetic induction component 53 is provided, which is arranged relative to a magnet in the magnetic attraction component 40. In some other embodiments, two magnetic induction components 53 are provided, which are arranged relative to the magnets in the first group of magnetic attraction components 54 and the second group of magnetic attraction components 55 respectively.

[0097] In some embodiments, the movable member 20 or the fixed member 10 is provided with an embedding groove, and the magnetic induction member 53 is disposed in the embedding groove. First, the magnetic induction element can be shielded and protected, and second, the magnetic induction member 53 does not need to occupy additional space, which is conducive to keeping the structure of the entire driving mechanism compact.

[0098] As a supplement, the present application describes the adaptation structure between the movable part 20 and the fixed part 10 .

[0099] In some embodiments, the movable part 20 is provided with an outer protrusion 27, which protrudes from the outer wall of the movable part 20 in a direction away from the driving component 30, and the fixed part 10 is provided with an inner protrusion 17, which protrudes from the inner wall of the fixed part 10 in a direction close to the driving component 30. The outer protrusion 27 and the inner protrusion 17 are arranged opposite to each other, a contact surface 21 is formed on the outer protrusion 27, and a support surface 11 is formed on the inner protrusion 17. The structure is simple and can achieve structural adaptation of the movable part 20 and the fixed part 10, so that the movable part 20 can be tightly assembled on the fixed part 10.

[0100] Furthermore, the outer convex portion 27 and the inner convex portion 17 are both arranged on a side adjacent to the driving assembly 30, so that the guide assembly 40 and the driving assembly 30 can be arranged on the same side of the movable member 20. The guide assembly 40 is clamped between the outer convex portion 27 and the inner convex portion 17, so that by reducing the value of x, the value of the overturning moment M acting on the movable member 20 is reduced, thereby reducing the risk of the movable member 20 tilting.

[0101] Furthermore, in this embodiment, the second magnetic member 51 is arranged on the outer protrusion 27, the first magnetic member 52 is arranged on the inner protrusion 17, and the guide assembly 40 and the magnetic assembly 50 are concentrated at the inner protrusion 17 and the outer protrusion 27, which is conducive to keeping the structure of the entire driving mechanism compact.

[0102] More specifically, in this embodiment, the magnetic induction member 53 and the first magnetic member 52 are arranged on the inner convex portion 17 of the fixed member 10, the second magnetic member 51 is arranged on the outer convex portion 27 of the movable member 20, and the first magnetic member 52 is arranged between the magnetic induction member 53 and the second magnetic member 51, and along the direction of the parallel preload P, the three are collinear with the second guide member 42. The guide assembly 40, the magnetic assembly 50, and the magnetic induction member 53 are concentrated at the inner convex portion 17 and the outer convex portion 27, which is conducive to keeping the structure of the entire drive mechanism compact, and the second magnetic member 51 is a magnet, and the sum of its length Y and the movable member stroke D is less than the length L of the first magnetic member 52, and the magnetic induction member 53 is opposite to the second magnetic member 51, which is conducive to detecting the change of the magnetic field and thus judging the position of the movable member 20.

[0103] Further, the movable member 20 is provided with an inner recess 26, which is formed by being recessed from the outer side wall of the movable member 20 in a direction close to the driving assembly 30, and the outer protrusion 27 is connected to the inner recess 26 and cooperates to form a first groove 28, and the inner protrusion 17 is suitable for inserting into the first groove 28. Correspondingly, the fixed member 10 is provided with an outer recess 16, which is formed by being recessed from the inner side wall of the fixed member 10 in a direction away from the driving assembly 30, and the outer recess 16 is connected to the inner protrusion 17 and cooperates to form a second groove 18, and the outer protrusion 27 is suitable for inserting into the second groove 18. The inner protrusion 17 and the outer protrusion 27 can relatively extend a greater distance in a direction perpendicular to the central axis O, which is convenient for setting the guide assembly 40, and the adaptation structure between the fixed member 10 and the movable member 20 is relatively compact, which is conducive to reducing the size of the driving mechanism in the direction perpendicular to the optical axis.

[0104] In some embodiments, the guide assembly 40 includes a first guide member 41 and a second guide member 42, and correspondingly, the outer protrusion 27, the inner recess 26, the inner protrusion 17, and the outer recess 16 are all set to two, and the relevant structure is as follows: the side of the first outer wall 22 connected to the second outer wall 23 protrudes outward in the direction away from the driving assembly 30 to form a first outer protrusion 271, and the first outer wall 22 is concave inward from the side of the first outer protrusion 271 away from the second outer wall 23 along the direction close to the driving assembly 30 to form a first inner recess 261, and the first inner recess 261 cooperates with the first outer protrusion 271 to form a first groove 281. Similarly, the side of the third outer wall 24 connected to the second outer wall 23 protrudes outward in the direction away from the driving assembly 30 to form a second outer protrusion 272, and the third outer wall 24 is concave inward from the side of the second outer protrusion 272 away from the second outer wall 23 along the direction close to the driving assembly 30 to form a second inner recess Part 262, the second inner recess 262 cooperates with the second outer protrusion 272 to form a first groove 282; similarly, the side where the first inner wall 12 is connected to the second inner wall 13 is recessed outwardly in the direction away from the driving component 30 to form a first outer recess 161, and the first inner wall 12 protrudes inwardly in the direction close to the driving component 30 from the side of the first outer recess 161 away from the second inner wall 13 to form a first inner protrusion 171, and the first outer recess 161 cooperates with the first inner protrusion 171 to form a second groove 181; the side where the third inner wall 14 is connected to the second inner wall 13 is recessed outwardly in the direction away from the driving component 30 to form a second outer recess 162, and the third inner wall 14 protrudes inwardly in the direction close to the driving component 30 from the side of the second outer recess 162 away from the second inner wall 13 to form a second inner protrusion 172, and the second inner protrusion 172 cooperates with the second outer recess 162 to form a second groove 2 182.

[0105] In some embodiments, the guide assembly 40 includes a first guide member 41 and a second guide member 42, and correspondingly, the outer protrusion 27, the inner recess 26, the inner protrusion 17, and the outer recess 16 are all set to two, and the relevant structure is as follows: the side of the first outer wall 22 connected to the second outer wall 23 protrudes outward in the direction away from the central axis O to form a first outer protrusion 271, and the first outer wall 22 is concave inward from the side of the first outer protrusion 271 away from the second outer wall 23 along the direction close to the central axis O to form a first inner recess 261, and the first inner recess 261 cooperates with the first outer protrusion 271 to form a first groove 281. Similarly, the side of the third outer wall 24 connected to the second outer wall 23 protrudes outward in the direction away from the central axis O to form a second outer protrusion 272, and the third outer wall 24 is concave inward from the side of the second outer protrusion 272 away from the second outer wall 23 along the direction close to the central axis O to form a second inner recess Part 262, the second inner recess 262 cooperates with the second outer protrusion 272 to form a first groove 282; similarly, the side where the first inner wall 12 is connected to the second inner wall 13 is recessed outwardly in a direction away from the central axis O to form a first outer recess 161, and the first inner wall 12 protrudes inwardly in a direction close to the central axis O from the side of the first outer recess 161 away from the second inner wall 13 to form a first inner protrusion 171, and the first outer recess 161 cooperates with the first inner protrusion 171 to form a second groove 181; the side where the third inner wall 14 is connected to the second inner wall 13 is recessed outwardly in a direction away from the central axis O to form a second outer recess 162, and the third inner wall 14 protrudes inwardly in a direction close to the central axis O from the side of the second outer recess 162 away from the second inner wall 13 to form a second inner protrusion 172, and the second inner protrusion 172 cooperates with the second outer recess 162 to form a second groove 2 182.

[0106] In some embodiments, the basic shapes of the movable part 20 and the fixed part 10 are both square. The movable part 20 also includes a fourth outer wall 25 opposite to the second outer wall 23, and the fixed part 10 also includes a fourth inner wall 15 opposite to the second inner wall 13. The overall shapes of the movable part 20 and the fixed part 10 are regular and easy to process.

[0107] In some embodiments, guide grooves extending in a direction parallel to the central axis O are respectively provided on the support surface 11 and the contact surface 21, and the guide assembly 40 is extended in a direction parallel to the central axis O and is clamped and limited by the guide grooves on both sides. It can be understood that the guide assembly 40 is continuously clamped in the guide grooves on both sides. When the movable member 20 moves in the direction of the central axis O, the guide assembly 40 is driven by the movable member 20 and moves in a direction parallel to the central axis O under the guidance of the guide grooves. In this movement process, the guide assembly 40 cooperates with the guide grooves on both sides to limit the movement direction of the movable member 20 to a certain extent, prevent the movable member 20 from rotating and tilting on a plane parallel to the support surface 11, and guide the movable member 20 to move along the central axis O.

[0108] In some embodiments, the support surface 11 is provided with a first guide groove 111 and a third guide groove 112 at intervals, and the contact surface 21 is provided with a corresponding second guide groove 211 and a fourth guide groove 212. The first guide groove 111 and the second guide groove 211 cooperate to clamp the first guide member 41 therein and guide the first guide member 41 to move along the central axis O, and the third guide groove 112 and the fourth guide groove 212 cooperate to clamp the second guide member 42 therein, and the first guide member 41 and the second guide member 42 keep the support surface 11 and the contact surface 21 parallel.

[0109] In some embodiments, the first guide groove 111 and the second guide groove 211 are a group of V-shaped grooves with grooves facing each other, and the third guide groove 112 and the fourth guide groove 212 are a group of V-shaped grooves with grooves facing each other. The first guide member 41 and the second guide member 42 support the movable member 20 from both sides of the driving assembly 30, respectively, and cooperate with the two groups of guide grooves to guide the movable member 20 to move along the central axis O. In other words, the first guide member 41 and the second guide member 42 support and position the movable member 20.

[0110] However, if the first guide groove 111 to the fourth guide groove 212 are all set as V-shaped grooves, then due to certain manufacturing tolerances of the movable member 20 and / or the fixed member 10, there will be a certain offset between the actual position of the guide groove and the preset point. After aligning the V-shaped openings of one set of guide grooves during assembly, there may be misalignment between the other pair of guide grooves, making it difficult to align, resulting in difficulty in installing one of the first guide member 41 and the second guide member 42 between the two misaligned guide grooves. In other words, setting all guide grooves as V-shaped grooves requires higher processing accuracy and higher processing costs.

[0111] To this end, in some embodiments, the shape of the guide groove is improved so that the second guide member 42 can move in a direction perpendicular to the central axis O along the groove bottom of the third guide groove 112 and / or the groove bottom of the fourth guide groove 212 .

[0112] Specifically, in this embodiment, the first guide groove 111 and the second guide groove 211 are V-shaped grooves with groove openings facing each other, the third guide groove 112 and the fourth guide groove 212 are arranged with groove openings facing each other, and at least one of them is a plane groove, and the plane groove has a groove bottom parallel to the support surface 11, so as to allow the second guide member 42 therein to move along the groove bottom of the third guide groove 112 and / or the groove bottom of the fourth guide groove 212 in a direction perpendicular to the central axis O. The movable member 20 and the fixed member 10 are supported and positioned by the V-shaped first guide groove 111 and the second guide groove 211 and the first guide member 41 in the group of V-shaped grooves. Due to manufacturing tolerance, when aligning the first guide groove 111 and the second guide groove 211, there may be a certain misalignment between the third guide groove 112 and the fourth guide groove 212, but since at least one of the two is a plane groove, the position of the second guide member 42 in the plane groove can be fine-tuned along the groove bottom of the plane groove, thereby solving the problem of difficulty in assembling the second guide member 42 caused by the misalignment of the third guide groove 112 and the fourth guide groove 212. The setting of the plane groove means that a certain distance deviation is allowed between the center of the plane groove and the center of the guide groove directly opposite to it, that is, a certain range of manufacturing tolerance is allowed between the movable member 20 and the fixed member 10, which reduces the precision requirements for the processing and manufacturing of the movable member 20 and the fixed member 10, and reduces the processing and assembly costs.

[0113] In some embodiments, one of the third guide groove 112 and the fourth guide groove 212 is a plane groove, and the other is a V-shaped groove. The second guide member 42 can slide along the bottom of the plane groove for fine adjustment during assembly, and can be inserted into the V-shaped groove and limited by the V-shaped groove. The second guide member 42 supports the movable member 20, which reduces the processing requirements and makes assembly easier and improves assembly efficiency.

[0114] In this embodiment, the third guide groove 112 and the fourth guide groove 212 are both plane grooves. The second guide member 42 can be slid and fine-tuned along the bottom of the third guide groove 112 and the bottom of the fourth guide groove 212 during assembly, that is, the second guide member 42 can be fine-tuned in the direction of approaching or moving away from the first guide member 41, and the second guide member 42 can support the movable member 20. Compared with the method of setting one of them as a plane groove, the machining accuracy requirements for the movable member 20 and / or the fixed member 10 are further reduced, and in particular, a certain range of machining tolerances can be allowed at the third guide groove 112 and the fourth guide groove 212.

[0115] In some other embodiments, the first guide groove 111 and the second guide groove 211 can also be square grooves or arc grooves. The specific shapes of the two are not limited, as long as they can just clamp the first guide member 41 to achieve the support and positioning functions. Similarly, the third guide groove 112 and the fourth guide groove 212 can also be set to other shapes, as long as they can achieve the support function, that is, as long as the second guide member 42 can be clamped between the contact surface 21 and the support surface 11.

[0116] The present application further supplements the structure related to the drive assembly 30. In some embodiments, the fixing member 10 is provided with an opening 19 penetrating from the outer wall of the fixing member 10 to the inner wall thereof, the pre-pressing assembly 31 is connected to the outer wall of the fixing member 10, the side of the pre-pressing assembly 31 facing the movable member 20 is connected to the actuating assembly 32, the actuating assembly 32 passes through the opening 19 and abuts against the movable member 20, connecting the pre-pressing assembly 31 to the outer wall of the fixing member 10. Compared with connecting the pre-pressing assembly 31 to the inner wall of the fixing member 10, it is easier to assemble, and this layout is conducive to keeping the structure of the drive mechanism compact.

[0117] In some embodiments, the pre-pressing assembly 31 includes a main body 311 and a fixing part 312, the fixing part 312 is connected to the outer wall of the fixing member 10, and the main body 311 is in contact with the actuating assembly 32, specifically, with the piezoelectric vibrator 322, or the piezoelectric circuit board 321 on the side of the piezoelectric vibrator 322 facing away from the movable member 20. The main body 311 applies a force to the piezoelectric vibrator 322 to move toward the movable member 20, so that the friction head 323 on the piezoelectric vibrator 322 applies a pre-pressing force P perpendicular to the direction of the central axis O to the movable member 20, and under the action of the pre-pressing force P, the movable member 20 can be driven by the friction head 323.

[0118] In some embodiments, the pre-pressing component 31 is an elastic structure, and further, the elastic structure can be a planar structure, such as a spring. This also means that the main body 311 and the fixing part 312 are an integrated structure, and the structure of the pre-pressing component 31 is more reliable to ensure that the pre-pressing force P can be continuously and stably provided, and the plane where the planar structure is located is extended perpendicular to the direction of the pre-pressing force P.

[0119] Specifically, the main body 311 of the elastic structure can be bonded to the actuator assembly 32 by glue, so that when the piezoelectric vibrator 322 is deformed, the elastic structure can also deform adaptively. The elastic structure always contacts the actuator assembly 32 and applies a pre-pressure P thereto.

[0120] In some embodiments, the prestressing assembly 31 may also be a prestressing plate, with the two ends of the prestressing plate forming a fixing portion 312, and the middle of the prestressing plate forming a main body 311. Specifically, the prestressing plate may be a plastic part or a metal part or other rigid structure, such as a hard plate body, a stainless steel plate, a ceramic, or a diamond formed by injection molding. Alternatively, the prestressing plate includes an inner layer structure and an outer layer structure, wherein the inner layer structure may be a metal sheet, and the inner layer structure may be formed into an integrated structure with the outer layer structure, such as plastic, through an insert injection molding process.

[0121] Furthermore, the pre-stressing component 31 also includes a support member arranged on the side of the pre-stressing plate away from the movable part 20. The support member can be made of a rigid material such as a steel sheet to ensure that the pre-stressing component 31 can always resist the actuating component 32 when the piezoelectric vibrator 322 is deformed, that is, the pre-stressing component 31 directly resists the piezoelectric vibrator 322, or indirectly resists the piezoelectric vibrator 322 through the piezoelectric circuit board 321, thereby providing a pre-stress P for the friction head 323.

[0122] In some embodiments, Fig.13 , Fig.14 As shown, the pre-stressing assembly 31 includes a structural member 313 and a buffer member 314 . The elastic modulus of the structural member 313 is greater than that of the buffer member. One side of the buffer member 314 is attached to the actuating assembly 32 , and the other side is attached to the structural member 313 . The structural member 313 is connected to the fixing member 10 .

[0123] The structural member 313 with a larger elastic modulus serves as the main supporting structure and can provide rigid support. The pre-pressure P provided by the structural member 313 is transmitted to the actuating assembly 32 through the buffer member 314, so that the friction head 323 abuts against the movable member 20 under the action of pressure. During this process, the buffer member 314 with a smaller elastic modulus can be deformed and can adaptively produce different degrees of shrinkage deformation according to different tolerances, thereby reducing the difference in the pre-pressure P of the piezoelectric motor under different tolerances. In the entire contact system composed of the movable member 20, the actuating assembly 32, the buffer member 314, and the structural member 313, the change in the pre-pressure P caused by material tolerance and assembly tolerance is reduced, so that the consistency of the driving assembly 30, that is, the piezoelectric motor is improved.

[0124] It should be noted that the buffer 314 is connected to the actuator assembly 32 , including two situations: the buffer 314 is directly attached to the piezoelectric vibrator 322 , or the buffer 314 is indirectly connected to the piezoelectric vibrator 322 by attaching the piezoelectric circuit board 321 .

[0125] Furthermore, the fixing member 10 is provided with an opening 19 which passes through the outer wall of the fixing member 10 to the inner wall thereof, the structural member 313 is connected to the outer wall of the fixing member 10, the buffer member 314 and the actuating assembly 32 thereon pass through the opening 19 and abut against the movable member 20, connecting the pre-stressing assembly 31 to the outer wall of the fixing member 10, which is easier to operate than connecting the pre-stressing assembly 31 to the inner wall of the fixing member 10, and this layout is conducive to keeping the driving mechanism structure compact.

[0126] It can be understood that along the direction of the pre-pressure P, that is, along the installation direction between the piezoelectric vibrator 322, the buffer 314, and the structural member 313, the projections of the buffer 314 and the actuating assembly 32 completely fall within the opening 19, so that the buffer 314 and the actuating assembly 32 connected thereto pass through the opening 19 and abut against the movable member 20. On the other hand, along the direction of the pre-pressure P, the projection of the structural member 313 exceeds the range of the opening 19, and the area on the structural member 313 corresponding to the projection of the part exceeding the opening 19 is connected to the outer wall of the fixing member 10, so as to fix the structural member 313 on the fixing member 10. In this embodiment, the length of the structural member 313 extending along the optical axis direction is greater than the length of the opening 19 on the fixing member 10 extending along the optical axis direction, so as to connect with the fixing member 10 through both ends of the structural member 313, and there are at least two connection areas between the structural member 313 and the fixing member 10 to ensure a certain connection strength, and the buffer 314 is arranged in the center relative to the structural member 313, so that the two ends of the structural member 313 can be symmetrically stressed.

[0127] More specifically, the buffer member 314 is in the shape of a thin sheet, and the buffer member 314 includes a first side surface 3141 and a second side surface 3142 which are arranged opposite to each other and parallel to each other, the first side surface 3141 is suitable for being attached to the actuating assembly 32, and the second side surface 3142 is suitable for being attached to the structural member 313, and the structural member 313 includes a third side surface 3131 corresponding to the second side surface 3142, and the third side surface 3131 is parallel to the outer wall of the fixing member 10, so that the actuating assembly 32 can be flatly fitted and fixed on the pre-stressing assembly 31, which is beneficial to maintain the parallelism of the actuating assembly 32 relative to the movable member 20 and the fixing member 10, so that the actuating assembly 32 is arranged in parallel between the movable member 20 and the fixing member 10.

[0128] In some embodiments, the structural member 313 is connected to the outer side wall of the fixing member 10 by means of gluing, clamping, welding, hot riveting, or fastener connection.

[0129] In some embodiments, in order to improve the driving performance of the piezoelectric motor, the piezoelectric vibrator 322 can be made of piezoelectric ceramic material or piezoelectric single crystal material. The piezoelectric vibrator 322 can be a single-layer ceramic body or a single-layer single crystal, or a multi-layer ceramic body or a multi-layer single crystal, for example, lead zirconate titanate (PZT)-based piezoelectric ceramics, potassium sodium niobate (KNN)-based piezoelectric ceramics, barium titanate (BT)-based piezoelectric ceramics, lead magnesium niobate-lead indium niobate (PMN-PT)-based piezoelectric single crystals, etc.

[0130] In some embodiments, the friction head 323 is made of wear-resistant material, for example, it can be made of various high-hardness wear-resistant ceramic materials, such as aluminum oxide, zirconium oxide, silicon carbide ceramics, or high-wear-resistant metal materials, carbon fiber materials, or composite materials of ceramics, metal particles and polymers, etc., so as to improve the wear resistance of the friction head 323, which is beneficial to increase the friction force between the movable part 20 and the friction head 323, that is, it is beneficial to increase the driving force F, and due to the wear resistance, it is beneficial to extend the service life of the friction head 323.

[0131] In contrast, in some embodiments, a wear-resistant portion is provided on the movable part 20, and the friction head 323 abuts against the wear-resistant portion. Specifically, the wear-resistant portion can be a wear-resistant coating, or a friction-resistant plate 29 assembled on the movable part 20, or an uneven surface of the movable part 20, etc., which can achieve a friction-resistant structure. The provision of the wear-resistant portion is beneficial to increasing the friction between the movable part 20 and the friction head 323, that is, it is beneficial to increasing the driving force F, and due to the wear resistance, it is beneficial to extend the service life.

[0132] Furthermore, when the wear-resistant part is set as a friction-resistant plate 29, it can be fixed on the movable part 20 by bonding, fastener connection, insert injection molding, etc. to form an integrated force-bearing structure with the movable part 20, and referring to the material of the friction head 323, the friction-resistant plate 29 can be made of the same or different wear-resistant material as the friction head 323.

[0133] It is understandable that the present application does not impose any specific restrictions on the specific shapes of the friction head 323 and the friction-resistant plate 29. In a specific embodiment, the shape of the friction head 323 can be a sphere, a hemisphere, a cuboid, a table, a cylinder, a semi-cylinder, etc., and the friction-resistant plate 29 can be a sheet or a block. In this embodiment, the friction head 323 is cylindrical, the friction-resistant plate 29 is a sheet, and the friction head 323 is in line contact with the wear-resistant part of the movable part 20, which has greater friction than point contact, that is, greater driving force F, that is, better driving effect.

[0134] In some embodiments, the friction head 323 and the piezoelectric vibrator 322 can be an integrated structure or a detachable structure. The friction head 323 and the piezoelectric vibrator 322 can be fixed to the piezoelectric vibrator 322 by bonding, snapping, nesting, welding or fastener connection. The friction head 323 and the piezoelectric vibrator 322 are in surface contact to ensure the connection strength. The friction head 323 can produce obvious movement with the deformation of the piezoelectric vibrator 322.

[0135] In some embodiments, the number of the friction heads 323 may be one or two or more. For example, in this embodiment, two friction heads 323 are provided on one side of the piezoelectric vibrator 322 facing the movable member 20, and the two friction heads 323 are spaced apart along the central axis O direction.

[0136] The present application can also provide a camera module, which includes an optical lens, a photosensitive component, and the above-mentioned driving mechanism. The optical lens is arranged on a movable part 20, and the photosensitive component is arranged relative to the optical lens. Since the movable part 20 equipped with the optical lens can be adjusted smoothly, it is beneficial to realize the focusing function or the anti-shake function, thereby improving the imaging quality.

[0137] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A driving mechanism applied to a camera module, characterized in that: include: a fixing member, the fixing member comprising a support surface; A movable member, the movable member is movably disposed on the fixed member, and the movable member includes a contact surface disposed opposite to the supporting surface; A guide assembly, the guide assembly being located between the support surface and the contact surface so as to maintain a fixed gap between the fixed member and the movable member; A driving assembly, the driving assembly is connected to the fixing member and abuts against the movable member and provides a pre-pressure; A magnetic attraction component, the magnetic attraction component includes at least one group of a first magnetic attraction component and a second magnetic attraction component, the first magnetic attraction component is arranged on one of the fixed component and the movable component, the second magnetic attraction component is arranged on the other of the fixed component and the movable component, the first magnetic attraction component interacts with the second magnetic attraction component to attract the contact surface of the movable component to the support surface of the fixed component, and the direction of the magnetic attraction force generated by the magnetic attraction component is parallel to the pre-pressure direction of the driving component.

2. The driving mechanism according to claim 1, characterized in that: The guide assembly and the drive assembly are arranged on the same side of the movable member.

3. The driving mechanism according to claim 2, characterized in that: The guide assembly includes a first guide member and a second guide member, and the first guide member and the second guide member are both arranged adjacent to the driving assembly.

4. The driving mechanism according to claim 3, characterized in that: The guide assembly, the drive assembly and the magnetic attraction assembly are all arranged on the same side of the movable part.

5. The driving mechanism according to claim 4, characterized in that: The magnetic attraction component includes a first group of magnetic attraction components and a second group of magnetic attraction components arranged relative to the driving component, and the first group of magnetic attraction components and the second group of magnetic attraction components are respectively arranged on both sides of the driving component.

6. The driving mechanism according to claim 5, characterized in that: Along the direction parallel to the pre-pressure, the first magnetic member and the second magnetic member in the first group of magnetic components are respectively arranged on both sides of the first guide member, and the first magnetic member and the second magnetic member in the second group of magnetic components are respectively arranged on both sides of the second guide member, the first magnetic member and the second magnetic member of the first group of magnetic components attract each other, and the first magnetic member and the second magnetic member in the second group of magnetic components attract each other.

7. The driving mechanism according to claim 5, characterized in that: The driving assembly includes a pre-stressing assembly and an actuating assembly, wherein the pre-stressing assembly is connected to the fixing member, and the actuating assembly is connected to the pre-stressing assembly. The pre-stressing assembly provides the pre-stressing force to the actuating assembly, so that the friction head of the actuating assembly abuts against one side of the movable member and applies the pre-stressing force to the movable member. The pre-stressing force is in the same direction as the magnetic attraction force. When the actuating assembly receives a driving signal, the friction head provides a driving force to the movable member to drive the movable member to move.

8. The driving mechanism according to claim 7, characterized in that: A plane passing through the center line of the pre-pressing component and extending along the pre-pressing direction is taken as a reference plane, and the first group of magnetic attraction components and the second group of magnetic attraction components are symmetrically arranged with respect to the reference plane.

9. The driving mechanism according to claim 7, characterized in that: The pre-stressing assembly includes a structural part and a buffer part, the elastic modulus of the structural part is greater than that of the buffer part, the fixing part is provided with an opening penetrating from the outer wall of the fixing part to the inner wall thereof, the structural part is connected to the outer wall of the fixing part, one side of the buffer part is attached to the structural part, and the other side is attached to the actuating assembly, the buffer part and the actuating assembly thereon pass through the opening and abut against the movable part.

10. The driving mechanism according to claim 1, characterized in that: Along the moving direction of the movable part, the length of the first magnetic part is L, the length of the second magnetic part is Y, and the travel range of the movable part driven by the driving component is D, Y>L+D, or L>Y+D.

11. The driving mechanism according to claim 1, characterized in that: It also includes a magnetic induction component, which is arranged relative to the magnetic attraction component, so as to determine the position of the movable part by inducing changes in the magnetic field.

12. The driving mechanism according to claim 3 or 4, characterized in that: The movable part is provided with an outer convex portion, which protrudes from the outer side wall of the movable part in a direction away from the driving component. The fixed part is provided with an inner convex portion, which protrudes from the inner side wall of the fixed part in a direction close to the driving component. The inner convex portion is arranged opposite to the outer convex portion, the contact surface is formed on the outer convex portion, and the support surface is formed on the inner convex portion.

13. The driving mechanism according to claim 12, characterized in that: The movable part is also provided with an inner recessed portion, which is formed by being recessed from the outer side wall of the movable part toward the direction close to the driving component, and the outer protrusion is connected to the inner recessed portion and cooperates to form a first groove, and the inner protrusion is suitable for being inserted into the first groove. The fixed part is provided with an outer recessed portion, which is formed by being recessed from the inner side wall of the fixed part toward the direction away from the driving component, and the outer recessed portion is connected to the inner protrusion and cooperates to form a second groove, and the outer protrusion is suitable for being inserted into the second groove.

14. The driving mechanism according to claim 12, characterized in that: The support surface is provided with a first guide groove and a third guide groove, and the contact surface is provided with corresponding second guide grooves and fourth guide grooves, the first guide groove and the second guide groove cooperate to clamp the first guide member therein, the third guide groove and the fourth guide groove cooperate to clamp the second guide member therein, and the first guide member and the second guide member keep the support surface and the contact surface parallel.

15. A camera module, characterized in that: include: Optical lens; A photosensitive component arranged relative to the optical lens; as well as According to the driving mechanism according to any one of claims 1 to 14, the optical lens is arranged on the movable part.

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