Driving device and camera module

Abstract

The invention discloses a driving device and a camera module, and belongs to the technical field of camera modules. The driving device comprises a fixed frame, a movable carrier, a driving assembly and a supporting assembly, the movable carrier is movably arranged on the fixed frame, and the driving assembly is connected with the fixed frame, abuts against the movable carrier at the same time, applies pre-pressure to the movable carrier and is suitable for driving the movable carrier to move relative to the fixed frame when receiving a driving signal. The supporting assembly comprises a first supporting piece and a second supporting piece, the first supporting piece abuts against the fixed frame and the movable carrier, and a certain gap exists between the second supporting piece and the fixed frame and / or the movable carrier. The driving mechanism is applied to the camera module. The invention has the advantages that the risk that the movable carrier inclines relative to the fixed frame can be reduced, the movable carrier and the supporting assembly are prevented from being stuck, the movable carrier moves smoothly, and the imaging quality is improved.

Description

Technical Field

[0001] The present application relates to the technical field of camera modules, and in particular to a driving device and a 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 higher quality photos. People expect to install small-sized, high-pixel and anti-shake camera modules on portable devices such as smartphones and tablets to obtain a better user experience.

[0003] In the prior art, the lens assembly is set on a movable carrier, the movable carrier is movably set on a fixed frame, and a driving device is installed between the two. The driving device provides pre-pressure to the movable carrier to abut against the movable carrier, and can drive the movable carrier to move relative to the fixed frame through friction, so as to achieve the lens adjustment function. However, due to the existence of the pre-pressure, the movable carrier may tilt relative to the fixed frame, causing the movable carrier to get stuck in a certain position, losing the lens adjustment function, and causing the imaging quality of the camera module to decrease. Summary of the invention

[0004] One purpose of the present application is to provide a driving device for a camera module, so as to reduce the risk of a movable carrier tilting relative to a fixed frame and avoid the movable carrier and a supporting assembly from getting stuck.

[0005] Another object of the present application is to provide a camera module, which is beneficial to improving imaging quality because the movable carrier equipped with the lens assembly can be adjusted smoothly.

[0006] In order to achieve the above objectives, the technical solution adopted in this application is: a driving device, applied to a camera module, comprising:

[0007] Fixed frame;

[0008] A movable carrier, the movable carrier being movably arranged on the fixed frame;

[0009] A driving assembly, the driving assembly is connected to the fixed frame and abuts against the movable carrier, applies a pre-pressure to the movable carrier, and is adapted to drive the movable carrier to move relative to the fixed frame when receiving a driving signal;

[0010] A support assembly, wherein the support assembly comprises a first support member and a second support member, wherein the first support member abuts against the fixed frame and the movable carrier respectively, and a certain gap exists between the second support member and the fixed frame and / or the movable carrier.

[0011] Preferably, the supporting assembly and the driving assembly are arranged on the same side of the driving device.

[0012] Preferably, the first support member and the second support member are located on the same side of the driving assembly.

[0013] Preferably, the first support member is closer to the driving assembly than the second support member.

[0014] Preferably, the first support member and the second support member are located on both sides of the driving assembly.

[0015] As a preference, along the pre-pressure direction, the first support member, the second support member, and the drive assembly are arranged along a straight line.

[0016] Preferably, the movable carrier includes a first outer convex portion, the fixed frame includes a first inner convex portion, the first outer convex portion and the first inner convex portion are arranged opposite to each other, and the first support member is arranged between the first outer convex portion and the first inner convex portion.

[0017] Preferably, a first guide portion is provided on the first outer convex portion, a second guide portion is provided on the first inner convex portion, two sides of the first support member are respectively abutted against the first guide portion and the second guide portion, and the first guide portion, the second guide portion and the first support member cooperate to guide the movable carrier to move along the first direction.

[0018] Preferably, the movable carrier further includes a second outer convex portion, the fixed frame further includes a second inner convex portion, the second outer convex portion and the second inner convex portion are arranged opposite to each other, and the second support member is arranged between the second outer convex portion and the second inner convex portion.

[0019] Preferably, a third guide portion is provided on the second outer convex portion, a fourth guide portion is provided on the second inner convex portion, and the second support member is arranged between the third guide portion and the fourth guide portion. The third guide portion, the fourth guide portion and the second support member cooperate to provide a certain space for adjustment of the movable carrier.

[0020] Preferably, the first support member and the second support member are both guide rods, the guide rods are arranged along a first direction, and at least two protrusions suitable for contacting the guide rods are provided on the movable carrier at intervals along the first direction.

[0021] Preferably, the driving assembly includes a pre-stressing assembly and an actuating assembly, wherein the pre-stressing assembly is connected to the fixed frame, and the actuating assembly is connected to the pre-stressing assembly, and the pre-stressing assembly provides pre-stress to the actuating assembly so that the driving end of the actuating assembly abuts against the movable carrier and applies the pre-stress to the movable carrier, so that the actuating assembly is suitable for driving the movable carrier to move relative to the fixed frame when receiving a driving signal.

[0022] Preferably, the pre-stressing assembly comprises a structural member and a buffer member, wherein the structural member is connected to the fixed frame, and the buffer member is disposed between the structural member and the actuating assembly and is adapted to be deformed by being squeezed by the structural member and the actuating assembly.

[0023] In order to achieve another purpose of the present application, the technical solution adopted in the present application is: a camera module, which includes:

[0024] The above-mentioned driving device;

[0025] a lens assembly, disposed in the driving device; and

[0026] The photosensitive component is arranged relative to the lens component.

[0027] Compared with the prior art, the beneficial effects of this application are:

[0028] (1) Under the action of the pre-pressure of the driving device, the first support member abuts against the fixed frame and the movable carrier respectively, and the first support member, the fixed frame and the movable carrier are tightly assembled, so that the movable carrier is movably supported on the fixed frame and can move smoothly. There is a certain gap between the second support member and the fixed frame and / or the movable carrier, that is, the second support member is loosely assembled, which can provide a certain space for the adjustment of the movable carrier. In the case that the movable carrier is tilted due to the influence of the pre-pressure, the second support member abuts against the fixed frame and the movable carrier, which can correct the movable carrier and make the movable carrier driven in the expected direction of movement.

[0029] (2) The tilt of the movable carrier may further cause the support assembly to get stuck, which in turn causes the movable carrier to be unable to move relative to the fixed frame and unable to achieve the focusing function. The present application reduces the risk of the movable carrier tilting and can also reduce the probability of the support assembly and the movable carrier getting stuck, so that the position of the movable carrier can be smoothly adjusted and the driving device can reliably achieve the focusing function, thereby improving the photographing effect.

[0030] (3) The setting of the support assembly can reduce the friction contact area between the movable carrier and the fixed frame, which is beneficial to reducing the friction force received by the movable carrier when it moves relative to the fixed frame, and the movable carrier is easy to be driven by the driving assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a driving device in the prior art;

[0032] Figure 2 It is a schematic diagram of the pre-pressure tilt causing the movable carrier to tilt;

[0033] Figure 3 A top view of a driving device in a preferred embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of the exploded structure of a driving device in a preferred embodiment of the present application;

[0035] Figure 5 for Figure 3 Schematic diagram of the cross-sectional structure in the AA direction;

[0036] Figure 6 It is a schematic diagram of the local structure of the driving device at the first support member;

[0037] Figure 7 It is a schematic diagram of the local structure of the driving device at the second supporting member;

[0038] Figure 8 It is a structural schematic diagram of a fixed frame;

[0039] Fig. 9 It is a structural schematic diagram of the movable carrier;

[0040] Fig.10 A top view of a driving device in another preferred embodiment of the present application;

[0041] Fig.11 This is a schematic diagram of the positions of the support assembly and the drive assembly in another preferred embodiment of the present application;

[0042] Fig.12 This is a schematic diagram of the exploded structure of a driving assembly in a preferred embodiment of the present application;

[0043] Fig.13 This is a schematic diagram of the driving principle of the actuating assembly in a preferred embodiment of the present application;

[0044] Fig.14 This is a schematic diagram of the driving principle of the actuating assembly in another preferred embodiment of the present application;

[0045] In the figure: 10, fixed frame; 11, first inner convex part; 112, second guide part; 12, first outer concave part; 13, second inner convex part; 134, fourth guide part; 14, second inner concave part; 15, opening; 20, movable carrier; 21, first outer convex part; 211, first guide part; 22, first inner concave part; 23, second outer convex part; 24, second inner concave part; 233, third guide part; 26, wear-resistant part; 201 , protrusion; 30, driving assembly; 31, pre-pressing assembly; 310, spring; 311, structural member; 312, buffer member; 32, actuating assembly; 321, flexible circuit board; 322, piezoelectric vibrator; 3221, first side electrode; 3222, second side electrode; 3223, third side electrode; 3224, fourth side electrode; 323, friction head; 40, supporting assembly; 41, first supporting member; 42, second supporting member. DETAILED DESCRIPTION

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] like Figure 1 , Figure 2As shown, a driving device applied to a camera module in the prior art includes a fixed frame 10, a movable carrier 20, a driving component 30 and a supporting component 40. The movable carrier 20 is movably arranged on the fixed frame 10. The driving component 30 is connected to the fixed frame 10 and abuts against the movable carrier 20, and is suitable for driving the movable carrier 20 to move relative to the fixed frame 10 when receiving a driving signal. The supporting component 40 is arranged between the fixed frame 10 and the movable carrier 20, so that there is a fixed gap between the opposite surfaces of the fixed frame 10 and the movable carrier 20, which can reduce the friction force on the movable carrier 20 when it moves relative to the fixed frame 10.

[0051] In some optional embodiments, a lens assembly is mounted on the movable carrier 20, and the lens assembly has an optical axis. The movable carrier 20 moves in a direction parallel to the optical axis to achieve a focusing function.

[0052] The driving assembly 30 is specifically implemented as a piezoelectric driver. In some specific embodiments, the driving assembly 30 includes a pre-stressing assembly 31 and an actuating assembly 32. The pre-stressing assembly 31 is connected to the fixed frame 10, and the actuating assembly 32 is connected to the pre-stressing assembly 31. The pre-stressing assembly 31 provides a pre-stressing force to the actuating assembly 32, so that the actuating assembly 32 abuts against one side of the movable carrier 20. The actuating assembly 32 includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 is connected to the pre-stressing assembly 31. The friction head 323 is fixed on the side of the piezoelectric vibrator 322 facing the movable carrier 20. The friction head 323 abuts against the side wall of the movable carrier 20 under the action of the pre-stressing force, that is, the friction head 323 and the pre-stressing assembly 31 are respectively arranged on the opposite sides of the piezoelectric vibrator 322. The piezoelectric vibrator 322 is a substrate that has an inverse piezoelectric effect and shrinks or expands according to the polarization direction and the electric field direction. It can be used by polarizing the substrate in the thickness direction of single crystal, polycrystalline ceramics, polymers, etc. The inverse piezoelectric effect refers to the application of an electric field in the polarization direction of the dielectric, and the dielectric undergoes mechanical deformation when a potential difference is generated. The piezoelectric vibrator 322 has the effect of ultrasonic oscillation, and can realize a deflection reciprocating motion or an elliptical motion on a specifically set electrode layer, thereby being able to drive the friction head 323 to perform a deflection reciprocating motion or an elliptical motion, and then through the friction between the friction head 323 and the outer wall of the movable carrier 20, the movable carrier 20 is driven to move relative to the fixed frame 10. In other words, the driving force can actually be understood as the friction force applied by the friction head 323 to the movable carrier 20.

[0053] There are two support assemblies 40, which are respectively arranged at two diagonal positions of the movable carrier 20. From a top view, the support assemblies 40 arranged at two diagonal positions of the movable carrier 20 and the actuating assembly 32 are arranged at three points on the side wall of the movable carrier 20. In some specific embodiments, the support assemblies 40 are balls or guide rods. It can be understood that when the support assemblies 40 are balls, generally a row of balls is respectively arranged at two diagonal positions of the movable carrier 20, and the two rows of balls provide a support plane for the movable carrier 20.

[0054] It should be pointed out that: 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 abutment surface of the movable carrier 20 changes accordingly, resulting in the pre-stress not always acting perpendicularly on the side wall of the movable carrier 20, but the direction of the pre-stress has a certain inclination relative to the plane where the side wall of the movable carrier 20 is located. At the same time, when the hardness of the pre-stress component 31 is relatively small, for example, when the pre-stress component 31 is a spring 310, the pre-stress component 31 may bend to a certain extent due to the deformation of the piezoelectric vibrator 322, resulting in the direction of the pre-stress relative to the angle of the abutment surface. That is to say, under certain circumstances, the direction of the pre-stress is inclined relative to the plane where the side wall of the movable carrier 20 is located. In this case, when the actuating component 32 drives the movable carrier 20 to move, it is easy to cause the movable carrier 20 to tilt.

[0055] Among them, Figure 2 As shown, when the pre-stressing component 31 is set as a spring sheet 310, the spring sheet 310 is located on the side of the piezoelectric vibrator 322 facing away from the movable carrier 20, the end of the spring sheet 310 is fixedly connected to the fixed frame 10, and the middle part of the spring sheet 310 is against the outer side of the piezoelectric vibrator 322, and the pre-stressing force is provided by the elastic force of the spring sheet 310. Since the spring sheet 310 has a small rigidity and is easy to deform, the spring sheet 310 will bend after providing the pre-stressing force, and an inclination angle will be generated in the middle part of the spring sheet 310, which will cause the piezoelectric vibrator 322 to have an inclination angle other than the preset angle relative to the movable carrier 20. For example, in an ideal case, the spring sheet 310 is arranged parallel to the abutting surface of the movable carrier 20 to provide a pre-stressing force perpendicular to the abutting surface of the movable carrier 20, but in actual use, the spring sheet 310 bends so that the piezoelectric vibrator 322 is tilted relative to the movable carrier 20, and the pre-stressing force acts on the movable carrier 20 obliquely, causing the movable carrier 20 to tilt.

[0056] In particular, Figure 1In the case where the support assembly 40 shown is arranged at two diagonal positions of the movable carrier 20, the distance from the center position of the frictional contact between the actuating assembly 32 and the movable carrier 20 to the connecting line of the support assembly 40 arranged at the two diagonal positions is the lever arm x. The magnitude of the overturning moment M of the movable carrier 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 carrier 20 is driven by the actuating assembly 32, the movable carrier 20 will have a larger inclination angle, causing the movable carrier 20 to tilt, affecting the speed and effect of optical focusing. In addition, in the structure where the support assembly 40 is arranged at the diagonal position, the two diagonal support assemblies 40 may generate uncertain friction force, causing the moving stroke and moving speed of the movable carrier 20 to fail to meet the standard. Moreover, the diagonal support assembly 40 may squeeze the driving assembly 30, causing the friction force of the support assembly 40 to increase.

[0057] What is worse is that when the support assembly 40 is implemented as a ball bearing, the ball bearings are in point contact with the side walls of the fixed frame 10 and the side walls of the movable carrier 20 on both sides. Once the movable carrier 20 tilts, at least one of the ball bearings in the support assembly 40 on each side will not be able to abut against the fixed frame 10 and the movable carrier 20 at the same time, which may easily cause the movable carrier 20 and the ball bearings to get stuck, or the movable carrier 20 and the ball bearings to fall off, making the movable carrier 20 unable to move further, affecting the focusing effect. Of course, when the support assembly 40 is implemented as a guide rod, the situation will be better than the ball bearings, but the tilt of the movable carrier 20 will also affect the optical focusing effect.

[0058] In order to solve the above problems, the present application first improves the support structure between the fixed frame 10 and the movable carrier 20 , that is, the structure related to the support assembly 40 .

[0059] The present application provides a driving device, which is applied to a camera module, such as Figure 3-Figure 14 As shown, it includes a fixed frame 10, a movable carrier 20, a driving assembly 30 and a supporting assembly 40. The movable carrier 20 is movably arranged on the fixed frame 10. The driving assembly 30 is connected to the fixed frame 10 and abuts against the movable carrier 20 to apply a pre-pressure to the movable carrier 20, and is suitable for driving the movable carrier 20 to move relative to the fixed frame 10 when receiving a driving signal. The supporting assembly 40 includes a first supporting member 41 and a second supporting member 42. The first supporting member 41 abuts against the fixed frame 10 and the movable carrier 20 respectively, and there is a certain gap between the second supporting member 42 and the fixed frame 10 and / or the movable carrier 20.

[0060] Combination Figure 5-Figure 7As shown, under the action of pre-pressure, the first support member 41 abuts against the fixed frame 10 and the movable carrier 20 at the same time, the first support member 41 is tightly assembled, and there is a certain gap between the second support member 42 and the fixed frame 10 and / or the movable carrier 20. The existence of this gap can provide a certain margin for the adjustment of the movable carrier 20, that is, the second support member 42 is loosely assembled. The supporting principle of the support assembly 40 is: when the movable carrier 20 is driven by the driving assembly 30, the first support member 41 always provides support for the movable carrier 20 to ensure the parallelism of the movement of the movable carrier 20. When the movable carrier 20 is tilted, the gap at the second support member 42 can provide a certain margin space for the position adjustment of the movable carrier 20, and when the movable carrier 20 is tilted to a certain degree, the two sides of the second support member 42 respectively abut against the fixed frame 10 and the movable carrier 20, which can correct the movable carrier 20 and avoid the movable carrier 20 from tilting, thereby avoiding affecting the movement of the movable carrier 20.

[0061] It can be understood that there is a certain gap between the second support member 42 and the fixed frame 10 and / or the movable carrier 20, including: the second support member 42 abuts the fixed frame 10 and there is a gap between it and the movable carrier 20; the second support member 42 abuts the movable carrier 20 and there is a gap between it and the fixed frame 10; there are gaps between the second support member 42 and the fixed frame 10 and the movable carrier 20. As long as the second support member 42 can provide a gap for the movable carrier 20 to adjust, it will be sufficient.

[0062] In some optional embodiments, a lens assembly is mounted on the movable carrier 20, and the lens assembly has an optical axis. The movable carrier 20 moves in a direction parallel to the optical axis to achieve a focusing function.

[0063] Furthermore, the fixed frame 10 is movably arranged on other frames to realize the anti-shake function, and the anti-shake structure can be specifically implemented as a piezoelectric motor, a voice coil motor or a memory alloy motor, etc. Among them, the structure of the piezoelectric motor can be optimized with reference to the improved scheme of the driving device of the present application.

[0064] In some optional embodiments, Figure 4 As shown, the driving assembly 30 includes a pre-pressing assembly 31 and an actuating assembly 32. The pre-pressing assembly 31 is connected to the fixed frame 10, and the actuating assembly 32 is connected to the pre-pressing assembly 31. The pre-pressing assembly 31 provides a pre-pressure to the actuating assembly 32, so that the actuating assembly 32 abuts against one side of the movable carrier 20. 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 carrier 20. The friction head 323 abuts against the side wall of the movable carrier 20 under the action of the pre-pressure to drive the movable carrier 20 to move relative to the fixed frame 10.

[0065] In some optional embodiments, the actuator assembly 32 further includes a piezoelectric circuit board, which is specifically a flexible printed circuit board 321, referred to as FPC, and the piezoelectric circuit board is connected to the piezoelectric vibrator 322 to provide power and drive signals for the piezoelectric vibrator 322. Specifically, the piezoelectric circuit board can be arranged on a side of the piezoelectric vibrator 322 that faces away from the movable carrier 20.

[0066] In some optional embodiments, the pre-pressing assembly 31 is disposed on a side of the piezoelectric vibrator 322 facing away from the movable carrier 20, so as to provide a pre-pressing force to the friction head 323 disposed on a side of the piezoelectric vibrator 322 facing the movable carrier 20 to press the movable carrier 20. Further, when the actuating assembly 32 includes a piezoelectric circuit board, the piezoelectric circuit board can be disposed between the piezoelectric vibrator 322 and the pre-pressing assembly 31.

[0067] In some optional embodiments, the first support member 41 is specifically implemented as a row of balls. Under the action of the pre-pressing assembly 31, a plurality of balls are clamped between the fixed frame 10 and the movable carrier 20. There is point contact between the balls and the movable carrier 20. The plurality of balls provide supporting force for the movable carrier 20, so that the movable carrier 20 is supported parallelly and stably on the fixed frame 10.

[0068] In another part of the optional embodiments, it is considered that when the movable carrier 20 has a certain inclination angle relative to the fixed frame 10, there is a risk of the ball being stuck, and when sliding friction occurs between the ball and the fixed frame 10 and the movable carrier 20, the ball may be in a rolling state or a sliding state. The motion state of the ball is uncertain, and the ball can switch the motion state at will, which increases the risk of getting stuck. In addition, the ball may also fall off, rub or collide with the movable carrier 20 and the fixed frame 10 to produce debris, and the debris causes the ball to get stuck. In other words, when the support assembly 40 is set as a ball, there is an uncertainty in friction and the defect of easy getting stuck, which will affect the focusing effect. As an improvement, in some embodiments, the first support member 41 is specifically implemented as a guide rod.

[0069] The second support member 42 may have the same or different structures as the first support member 41. In some optional embodiments, the second support member 42 is a ball, and in another optional embodiment, the second support member 42 is a guide rod.

[0070] In this embodiment, the first support member 41 and the second support member 42 are both guide rods, which are parallel to each other and extend along the optical axis direction to ensure the consistency between the first support member 41 and the second support member 42. The guide rods are in line contact with the fixed frame 10 and the movable carrier 20. When the driving assembly 30 drives the movable carrier 20 to move along the optical axis relative to the fixed frame 10, the guide rods can always support the movable carrier 20. The movable carrier 20 is not easy to have an inclination angle under the support of the guide rods, and the movable carrier 20 is not easy to get stuck with the guide rods, which can reduce the risk of tilting the movable carrier 20, thereby avoiding affecting the optical focus function.

[0071] In some optional embodiments, a limiting structure for the support assembly 40 is provided on the fixed frame 10 and / or the movable carrier 20 to prevent the support assembly 40 from falling off from between two opposing abutting surfaces of the fixed frame 10 and the movable carrier 20 .

[0072] It should be noted that the present application does not limit the support assembly 40 to be specifically a ball, guide rod or other structure, as long as it can support the movable carrier 20. For example, the support assembly 40 can also be implemented as a slider fixed on the movable carrier 20 or the fixed frame 10.

[0073] On the other hand, the present application also improves the positions of the drive assembly 30 and the support assembly 40 from the perspective of reducing the overturning moment M, and arranges the support assembly 40 and the drive assembly 30 on the same side of the drive device to further reduce the probability of the movable carrier 20 tilting.

[0074] contrast Figure 1 and Figure 3 Compared with the prior art in which two support assemblies 40 and the friction head 323 of the actuating assembly 32 are arranged at three points on the side wall of the movable carrier 20, the support assembly 40 and the driving assembly 30 are arranged on the same side of the driving device, so that the distance from the friction head 323 of the actuating assembly 32 to the connecting line between the two support assemblies 40 is reduced, that is, x becomes smaller, so that the overturning moment M acting on the movable carrier 20 becomes smaller. When the movable carrier 20 is driven by the actuating assembly 32 to move, the inclination angle of the movable carrier 20 is small, and the risk of the movable carrier 20 tilting and the support assembly 40 getting stuck is reduced, thereby avoiding affecting the optical focusing effect. In addition, the support component 40 is arranged between the fixed frame 10 and the movable carrier 20, so that there is a fixed gap between the opposite surfaces of the fixed frame 10 and the movable carrier 20. The support component 40 can change the contact mode between the fixed frame 10 and the movable carrier 20, such as point contact and line contact. Compared with the friction generated by direct surface contact between the fixed frame 10 and the movable carrier 20, the friction contact area is reduced, thereby reducing the friction force on the movable carrier 20 when it moves relative to the fixed frame 10, and the movable carrier 20 is easier to drive.

[0075] Furthermore, the support assembly 40 and the driving assembly 30 are arranged on the same side of the driving device, including two implementations: one is that the first support member 41 and the second support member 42 are located on the same side of the driving assembly 30, and the other is that the first support member 41 and the second support member 42 are located on both sides of the driving assembly 30. Both implementations can achieve the purpose of reducing the distance from the friction head 323 of the driving assembly 30 to the connecting line of the first support member 41 and the second support member 42, that is, reducing the overturning arm x of the movable carrier 20.

[0076] In this example, Figure 3 As shown, the first support member 41 and the second support member 42 are located on the same side of the driving assembly 30. Furthermore, the first support member 41 is closer to the driving assembly 30 than the second support member 42. In combination with the first support member 41 being tightly assembled and the second support member 42 being loosely assembled, when the movable carrier 20 is not tilted, the distance from the friction head 323 of the driving assembly 30 to the first support member 41 is the lever arm x of the overturning moment M of the movable carrier 20. The closer the first support member 41 is to the driving assembly 30, the smaller the lever arm x is, and the smaller the overturning moment M is.

[0077] Furthermore, along the prestressing direction, the first support member 41, the second support member 42, and the drive assembly 30 are arranged along a straight line. In other words, the center of the friction head 323, the center of the first support member 41, and the center of the second support member 42 are located on a straight line. Then the distance from the friction head 323 of the drive assembly 30 to the connecting line of the first support member 41 and the second support member 42 is the distance from the friction head 323 to the first support member 41. Even in the case where the movable carrier 20 has tilted, the distance from the friction head 323 to the first support member 41 is the lever arm x corresponding to the overturning moment M of the movable carrier 20. When the drive assembly 30 drives the movable carrier 20, the magnitude of the overturning moment M acting on the movable carrier 20 is positively correlated with the value of the lever arm x. The present application reduces the value of x, thereby reducing the value of the overturning moment M, thereby solving the problem of the movable carrier 20 tilting or even getting stuck.

[0078] Of course, in some optional embodiments, such as Fig.10As shown, the first support member 41, the second support member 42, and the drive assembly 30 may not be arranged along a straight line. In other words, the center of the friction head 323, the center of the first support member 41, and the center of the second support member 42 may also be misaligned. As long as the drive assembly 30, the first support member 41, and the second support member 42 are arranged adjacent to each other, the distance from the friction head 323 to the line connecting the first support member 41 and the second support member 42 can be reduced. Reducing the distance from the friction head 323 to the line connecting the first support member 41 and the second support member 42 is equivalent to reducing the value of the lever arm x and the overturning moment M, which can reduce the risk of the movable carrier 20 tilting relative to the fixed frame 10, avoid the movable carrier 20 and the support assembly 40 from getting stuck, so that the movable carrier 20 equipped with the lens assembly can be adjusted smoothly, which is conducive to improving the imaging quality of the corresponding camera module.

[0079] In some embodiments, Fig.11 As shown, the first support member 41 and the second support member 42 are located on both sides of the driving assembly 30 .

[0080] In order to make the solution of the present application easier to understand, the specific structure related to the assembly of the support assembly 40 is given below.

[0081] Combination Figure 6-Figure 9 As shown, in some optional embodiments, the movable carrier 20 includes a first outer protrusion 21, the fixed frame 10 includes a first inner protrusion 11, the first outer protrusion 21 is arranged opposite to the first inner protrusion 11, and the first support member 41 is arranged between the first outer protrusion 21 and the first inner protrusion 11. The arrangement of the first outer protrusion 21 and the first inner protrusion 11 can provide an assembly space for the first support member 41.

[0082] Furthermore, in the present embodiment, a first outer recess 12 corresponding to the first outer protrusion 21 is provided on the fixed frame 10, and a first inner recess 22 corresponding to the first inner protrusion 11 is provided on the movable carrier 20. The first outer protrusion 21 is suitable for being inserted into the first outer recess 12, and the first inner protrusion 11 is suitable for being inserted into the first inner recess 22. Such an arrangement is conducive to reducing the size of the entire driving device in a direction perpendicular to the optical axis.

[0083] In some optional embodiments, the first outer convex portion 21 is provided with a first guide portion 211, the first inner convex portion 11 is provided with a second guide portion 112, the two sides of the first support member 41 are respectively in contact with the first guide portion 211 and the second guide portion 112, the first guide portion 211, the second guide portion 112 and the first support member 41 cooperate to guide the movable carrier 20 to move along the first direction, and it can be understood that the first direction here is the direction parallel to the optical axis. In other words, due to the provision of the first guide portion 211 and the second guide portion 112, the first support member 41 can not only support the movable carrier 20, but also guide the movable carrier 20 to move along the direction parallel to the optical axis, and play a positioning role for the movable carrier 20.

[0084] Specifically, the first guide portion 211 and the second guide portion 112 are both implemented as guide grooves extending in a direction parallel to the optical axis, the notches of the two guide grooves are arranged oppositely, and the support 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. The support assembly 40 is continuously clamped in the guide grooves on both sides. When the driving assembly 30 applies a driving force to the movable carrier 20, due to the restrictions of the first guide portion 211 and the second guide portion 112, the first support member 41 can only move relative to the fixed frame 10 and / or the movable carrier 20 in a direction parallel to the optical axis, guiding the movable carrier 20 to move in a direction parallel to the optical axis, thereby reducing the possibility of the movable carrier 20 tilting.

[0085] More specifically, in this embodiment, the first support member 41 is a cylindrical guide rod, and the first guide portion 211 and the second guide portion 112 are V-shaped grooves, and the two V-shaped grooves clamp the guide rod. The structure is simple and easy to assemble. In other embodiments of the present application, the first guide portion 211 and the second guide portion 112 can also be set as other structures such as U-shaped grooves, and the present application does not limit this.

[0086] In some optional embodiments, the movable carrier 20 further includes a second outer protrusion 23, the fixed frame 10 further includes a second inner protrusion 13, the second outer protrusion 23 is arranged opposite to the second inner protrusion 13, and the second support member 42 is arranged between the second outer protrusion 23 and the second inner protrusion 13. The arrangement of the second inner protrusion 13 and the second outer protrusion 23 can provide an assembly space for the second support member 42.

[0087] Furthermore, in this embodiment, a second outer recess 14 corresponding to the second outer protrusion 23 is provided on the fixed frame 10, and a second inner recess 24 corresponding to the second inner protrusion 13 is provided on the movable carrier 20. The second outer protrusion 23 is suitable for being inserted into the second outer recess 14, and the second inner protrusion 13 is suitable for being inserted into the second inner recess 24. Such an arrangement is conducive to reducing the size of the entire driving device in a direction perpendicular to the optical axis.

[0088] In some optional embodiments, the second outer convex portion 23 is provided with a third guide portion 233, the second inner convex portion 13 is provided with a fourth guide portion 134, and the second support member 42 is disposed between the third guide portion 233 and the fourth guide portion 134. In addition, a gap is left between the second support member 42 and the third guide portion 233 and / or the fourth guide portion 134, forming a loose assembly. The third guide portion 233, the fourth guide portion 134 and the second support member 42 cooperate to provide adjustment space for the movable carrier 20. When the movable carrier 20 tilts to a certain extent, the second support member 42 abuts against the third guide portion 233 and the fourth guide portion 134 respectively, preventing the movable carrier 20 from tilting further and correcting the angle of the movable carrier 20.

[0089] Specifically, the third guide portion 233 and the fourth guide portion 134 are both implemented as guide grooves extending in a direction parallel to the optical axis, the notches of the two guide grooves are arranged oppositely, and the support assembly 40 is extended in a direction parallel to the central axis O and is arranged between the guide grooves on both sides. When the movable carrier 20 is tilted to a certain angle, the second support member 42 abuts against the third guide portion 233 and the fourth guide portion 134. Due to the restrictions of the third guide portion 233 and the fourth guide portion 134, the second support member 42 can only move relative to the fixed frame 10 and / or the movable carrier 20 in a direction parallel to the optical axis, thereby guiding the movable carrier 20 to move in a direction parallel to the optical axis, playing a role in correcting the movable carrier 20, and reducing the possibility of the movable carrier 20 tilting.

[0090] More specifically, in this embodiment, the second support member 42 is a cylindrical guide rod, and the third guide portion 233 and the fourth guide portion 134 are V-shaped grooves. The structure is simple and easy to assemble. In other embodiments of the present application, the third guide portion 233 and the fourth guide portion 134 can also be set as other structures such as U-shaped grooves, and the present application does not limit this.

[0091] Furthermore, the driving assembly 30 is arranged between the first outer protrusion 21 and the fixed frame 10, specifically, on the side of the first outer protrusion 21 facing away from the first support member 41, so as to further shorten the distance between the driving assembly 30 and the connecting line between the first support member 41 and the second support member 42, that is, to reduce the lever arm x and thereby reduce the overturning moment M of the movable carrier 20.

[0092] In this embodiment, the first support member 41 and the driving assembly 30 are arranged on two opposite sides of the first outer protrusion 21, and in the pre-pressure direction, the center of the driving assembly 30, the center of the first support member 41, and the center of the second support member 42 are in a straight line. This means that the arrangement of the first outer protrusion 21, the first inner protrusion 11, the second outer protrusion 23, and the second inner protrusion 13 enables the driving assembly 30 to be arranged on the same side of the driving device as the support assembly 40, and in particular, it is conducive to realizing that the first support member 41, the second support member 42, and the driving assembly 30 are arranged in the same straight line in the pre-pressure direction.

[0093] In some optional embodiments, the first support member 41 and the second support member 42 are both guide rods, and the guide rods are arranged along the first direction, and along the first direction, at least two protrusions 201 suitable for contacting the guide rods are arranged at intervals on the movable carrier 20. The movable carrier 20 contacts the guide rods through the protrusions 201, and a relative depression is formed between two adjacent protrusions 201, and the depression does not contact the guide rod, which can reduce the friction contact area between the movable carrier 20 and the guide rod, and reduce the friction resistance encountered by the movable carrier 20 when moving, and the protrusions 201 are arranged at intervals in the length direction of the guide rod, so as to support the guide rod at at least two points or two areas in the length direction of the guide rod, so that the guide rod can be supported stably.

[0094] Preferably, both the first outer convex portion 21 and the second outer convex portion 23 are provided with protrusions 201 to reduce the friction force applied by the first support member 41 and the second support member 42 to the movable carrier 20, so that the movable carrier 20 is easier to be driven.

[0095] In some optional embodiments, the protrusion heights of the protrusions 201 are consistent to keep the length direction of the guide rod parallel to the optical axis.

[0096] In some optional embodiments, the movable carrier 20 is provided with two protrusions 201, and the two protrusions 201 are located at both ends of the movable carrier 20, and the middle part of the movable carrier 20 is relatively recessed to be separated from the middle part of the support assembly 40. The purpose of reducing the friction contact area and stably supporting the guide rod is achieved with a minimum number of protrusions 201, and the structure is relatively simple and easy to process.

[0097] It can be understood that when the first support member 41 and the second support member 42 are assembled through the first outer protrusion 21, the first inner protrusion 11, the second outer protrusion 23, and the second inner protrusion 13, the protrusion 201 is arranged on the first outer protrusion 21 and / or the second outer protrusion 23. Moreover, the protrusion 201 is not inconsistent with the first guide portion 211 and the third guide portion 233. For example, in this embodiment, the first guide portion 211 and the third guide portion 233 are both V-shaped grooves, and the V-shaped grooves are in contact with the guide rods by two side walls. The middle parts of the two side walls of the V-shaped grooves are recessed downward to avoid contact with the guide rods. The upper and lower ends of the two side walls of the V-shaped grooves are respectively protruded in the direction perpendicular to the optical axis, forming the so-called protrusion 201.

[0098] On the other hand, the present application further improves the structure of the driving assembly 30 to reduce the probability of the movable carrier 20 tilting.

[0099] like Figure 4 As shown, the driving assembly 30 includes a pre-stressing assembly 31 and an actuating assembly 32. The pre-stressing assembly 31 is connected to the fixed frame 10, and the actuating assembly 32 is connected to the pre-stressing assembly 31. The pre-stressing assembly 31 provides a pre-stress to the actuating assembly 32, so that the driving end of the actuating assembly 32 abuts against the movable carrier 20 and applies the pre-stress to the movable carrier 20, so that the actuating assembly 32 is suitable for driving the movable carrier 20 to move relative to the fixed frame 10 when receiving a driving signal.

[0100] In some optional embodiments, the actuating assembly 32 includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 is connected to the pre-pressure assembly 31. The friction head 323 is fixed on the side of the piezoelectric vibrator 322 facing the movable carrier 20. The friction head 323 abuts against the side wall of the movable carrier 20 under the action of the pre-pressure, and serves as the driving end of the actuating assembly 32 to drive the movable carrier 20 to move.

[0101] In some optional embodiments, Fig.12 As shown, the actuating assembly 32 further includes a flexible circuit board 321 , and the flexible circuit board 321 is disposed between the pre-pressing assembly 31 and the piezoelectric vibrator 322 .

[0102] In some optional embodiments, the pre-pressing component 31 is an elastic structure, such as a spring sheet 310. Specifically, the spring sheet 310 can be bonded to the actuating component 32 by glue.

[0103] In some optional embodiments, considering that the spring piece 310 will deform along with the piezoelectric vibrator 322, resulting in the pre-pressure acting on the movable carrier 20 in an inclined manner, thereby causing the movable carrier 20 to tilt, the pre-pressure assembly 31 is improved: the pre-pressure assembly 31 includes a structural member 311 and a buffer member 312, the structural member 311 is connected to the fixed frame 10, the buffer member 312 is arranged between the structural member 311 and the actuating assembly 32, and is suitable for being deformed by the extrusion of the structural member 311 and the actuating assembly 32. In other words, the actuating assembly 32 is attached to the structural member 311 through the buffer member 312.

[0104] In the prior art, the pre-stressing assembly 31 will deform and bend, causing the actuating assembly 32 to tilt relative to the movable carrier 20. The pre-stressing tilting acts on the movable carrier 20, causing the movable carrier 20 to tilt. It also causes the actuating assembly 32 to drive the movable carrier 20 to move at inconsistent speeds in two opposite directions relative to the fixed frame 10, affecting the driving effect of the drive device. The present application improves the structure of the pre-stressing assembly 31, and the structural member 311 will not be significantly deformed under the action of the pre-stressing pressure, which can prevent the actuating assembly 32 from tilting relative to the movable carrier 20, improve the driving effect of the drive device, and further improve the shooting effect of the camera module. Since the buffer member 312 can be deformed, the buffer member 312 is set between the structural member 311 and the actuating assembly 32. When assembling the drive device, the deformation of the buffer member 312 can offset at least part of the change in the pre-stressing pressure caused by the material tolerance and the assembly tolerance, thereby improving the consistency of the pre-stressing pressure in multiple drive devices of the same batch. In addition, the problem that the piezoelectric vibrator 322 in the actuator component 32 and the spring 310 form a rigid whole due to the large elastic modulus of adhesives such as UV glue or thermosetting glue after curing, which affects the vibration mode of the piezoelectric vibrator 322 and thus affects the driving effect, is solved. The buffer member 312 of the present application can absorb part of the deformation of the piezoelectric vibrator 322, which is conducive to maintaining the setting angle of the piezoelectric vibrator 322 relative to the movable carrier 20, so that the actual movement state of the piezoelectric vibrator 322 is close to the design value, reducing the influence of the external environment, such as the deformation of the pre-load component 31, on the movement of the piezoelectric vibrator 322.

[0105] Specifically, the movable carrier 20 is arranged in the fixed frame 10, and the fixed frame 10 is provided with an opening 15 that penetrates both sides of the fixed frame 10. The structural member 311 is arranged outside the fixed frame 10, and the size of the structural member 311 in at least one direction is larger than the size of the opening 15, so that the structural member 311 can be fixed outside the fixed frame 10, and the buffer member 312 and the actuating assembly 32 pass through the opening 15, so that the actuating assembly 32 can abut against the movable carrier 20. It should be understood that the length and width of the opening 15 are greater than or equal to the length and width of the actuating assembly 32 and the buffer member 312, so that the actuating assembly 32 and the buffer member 312 can pass through the opening 15 so that the actuating assembly 32 can abut against the movable carrier 20. The piezoelectric vibrator 322 is accommodated in the opening 15, reducing the size increase caused by the external placement of the piezoelectric vibrator 322, and reducing the size of the driving device. It should be noted that in the present application, the size of the components such as the buffer 312, the piezoelectric vibrator 322 in the driving component 30, and the opening 15 on the fixed frame 10 refers to the size of the projection of each component on the structural component 311 along the installation direction between the actuator component 32, the buffer 312, and the structural component 311.

[0106] The structural member 311 can be fixed on the outer surface of the fixed frame 10 by welding, hot riveting, bonding, etc.

[0107] The buffer member 312 is in the form of a thin sheet, which is used to be parallel to the two side surfaces to which the actuating assembly 32 and the structural member 311 are attached, that is, the outer side surface of the buffer member 312 is arranged in parallel with the inner side surface, and the side of the structural member 311 facing the buffer member 312 is a plane, which is connected to the outer side surface of the fixed frame 10 and the actuating assembly 32, so that the actuating assembly 32 can be kept parallel to the structural member 311, maintaining the parallelism of the actuating assembly 32 relative to the movable carrier 20 and the fixed frame 10, so that the actuating assembly 32 is arranged in parallel between the movable carrier 20 and the fixed frame 10.

[0108] In some optional embodiments, the buffer 312 can be implemented as a tape, and the two opposite surfaces of the buffer 312 are respectively bonded to the structural member 311 and the actuating assembly 32. Compared with the glue connection method, the tape connection has at least three advantages: first, it avoids the use of high elastic modulus glue, such as UV glue with an elastic modulus of at least 1GPa after curing, which will affect the deformation of the buffer 312 and the piezoelectric vibrator 322; second, it is easy to operate, and the actuating assembly 32 can be directly attached to the structural member 311 without the steps of coating glue and curing glue; third, the parallelism of the tape is relatively good, and two parallel opposite surfaces can be provided to bond the actuating assembly 32 and the structural member 311 respectively, which is conducive to improving the parallelism of the actuating assembly 32 relative to the fixed frame 10 and the movable carrier 20.

[0109] Furthermore, the present application briefly describes the working principle of the piezoelectric vibrator 322 in some embodiments.

[0110] Reference Fig.12 , Fig.13 As shown, for ease of description, the thickness direction of the piezoelectric vibrator 322 is taken as the up-down direction, the length direction of the piezoelectric vibrator 322 is taken as the left-right direction of the piezoelectric vibrator 322 , and the width direction is taken as the front-back direction of the piezoelectric vibrator 322 .

[0111] The piezoelectric vibrator 322 has a multi-layer stacked structure. Specifically, the piezoelectric vibrator 322 is stacked in the order of ceramic layer, electrode layer, ceramic layer, electrode layer...ceramic layer, electrode layer, ceramic layer in the thickness direction. Each electrode layer is arranged between two adjacent ceramic layers, and the upper and lower halves of the piezoelectric vibrator 322 are polarized in opposite directions respectively.

[0112] There are four side electrodes on the side of the piezoelectric vibrator 322, which are respectively recorded as the first side electrode 3221, the second side electrode 3222, the third side electrode 3223, and the fourth side electrode 3224. The first side electrode 3221 and the second side electrode 3222 are arranged front to back oppositely and are both arranged on the left side of the piezoelectric vibrator 322, and the third side electrode 3223 and the fourth side electrode 3224 are arranged front to back oppositely and are both arranged on the right side of the piezoelectric vibrator 322. The first side electrode 3221 and the second side electrode 3222 are located on the left and right sides of the front of the piezoelectric vibrator 322, and are respectively suitable for receiving two electrical signals with the same frequency but different phases, for example Fig.13 The second side electrode 3222 and the fourth side electrode 3224 are located at the left and right sides behind the piezoelectric vibrator 322 and are grounded respectively.

[0113] It is easy to understand that the access of electrical signals and grounding of the side electrodes are achieved by electrical connection with the flexible circuit board 321 .

[0114] The four side electrodes extend in the thickness direction of the piezoelectric vibrator 322, and are electrically connected to the top electrode layer, the middle electrode layers, and the bottom electrode layer in sequence, so that an electric field is generated between adjacent electrode layers. Under the action of the electric field, the ceramic layer undergoes elongation or contraction deformation. Fig.13 In the figure, arrows facing each other indicate contraction, and arrows facing away indicate extension. Through the multi-layer stacked structure, the electric field formed between each two adjacent electrode layers is superimposed in the vertical direction. Therefore, the voltage required to drive the entire piezoelectric vibrator 322 to flexural vibration is reduced. The number of electrode layers and the number of ceramic layers can be designed according to the specific driving force requirements and voltage requirements that can be provided.

[0115] In order to explain the working principle of the piezoelectric vibrator 322 more clearly, based on the above settings, the piezoelectric vibrator 322 is divided into an upper left section, an upper right section, a lower left section, and a lower right section, and when the side electrode is connected to the electrical signal, four time points from t1 to t4 are intercepted for observation. The piezoelectric vibrator 322 generates the following signals at the four moments t1, t2, t3, and t4: Fig.13 The four deformation states are shown in the figure. At time t1, the upper left section and the upper right section contract, the lower left section and the lower right section extend, the piezoelectric vibrator 322 bends upward, and the friction head 323 moves downward relatively. At time t2, the upper left section and the lower right section contract, and the lower left section and the upper right section extend, so that the left side of the piezoelectric vibrator 322 bends upward and the right side bends downward, and the friction head 323 moves to the upper left. At time t3 and time t4, the friction head 323 first moves upward and then moves to the lower right. The next time the input electrical signal is the same as t1, the friction head 323 moves downward to the same position as t1, and the piezoelectric vibrator 322 switches between these four deformation states, so that the friction head 323 fixed to the upper surface of the piezoelectric vibrator 322 produces an elliptical motion as shown in the figure. The friction head 323 is able to push the movable carrier 20 to move through high frequency.

[0116] The present application can also provide another structure of the actuating assembly 32, such as Fig.14 As shown, it includes a piezoelectric vibrator 322 and a friction head 323. The piezoelectric vibrator 322 includes a first end face 3241 and a second end face 3242 that are opposite to each other. The first end face 3241 includes at least two electrode regions. At least one of the at least two electrode regions is used to be applied with an AC excitation electrical signal to enable the piezoelectric vibrator 322 to generate a bending-cutting characteristic mode. The second end face 3242 is used to be fixed to a surface to be installed, that is, a pre-stressing component 31. The piezoelectric vibrator 322 is polarized along the direction from the first end face 3241 to the second end face 3242. The friction head 323 is arranged on the first end face 3241 and connected to the at least two electrode regions. The friction head 323 serves as a driving end of the actuator component 32 and is used to frictionally contact with the movable carrier 20 to drive the movable carrier 20 to move when the piezoelectric vibrator 322 generates a bending-cutting characteristic mode.

[0117] In some embodiments, in order to improve the driving performance of the driving component 30, 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.

[0118] 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 carrier 20 and the friction head 323, that is, it is beneficial to increase the driving force, and due to the wear resistance, it is beneficial to extend the service life of the friction head 323.

[0119] In contrast, in some embodiments, reference Figure 4 , Figure 5 As shown, a wear-resistant portion 26 is provided on the movable carrier 20, and the friction head 323 abuts against the wear-resistant portion 26. Specifically, the wear-resistant portion 26 can be a wear-resistant coating, or a friction-resistant plate assembled on the movable carrier 20 by bonding, insert injection molding, etc., or an uneven outer surface of the movable carrier 20, etc., which can achieve a friction-resistant structure. The provision of the wear-resistant portion 26 is beneficial to improving the friction between the movable carrier 20 and the friction head 323, that is, it is beneficial to improving the driving force, and because of the wear resistance, it is beneficial to extend the service life.

[0120] Furthermore, when the wear-resistant portion 26 is set as a friction-resistant plate, it can be fixed on the movable carrier 20 by bonding, fastener connection, insert injection molding, etc. to form an integrated force-bearing structure with the movable carrier 20, and referring to the material of the friction head 323, the friction-resistant plate can be made of the same or different wear-resistant material as the friction head 323.

[0121] It is understood that the present application does not impose any specific restrictions on the specific shapes of the friction head 323 and the friction-resistant plate. 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 can be a sheet or a block. In an example of the present application, the friction head 323 is in the shape of a cylinder, and the cylindrical friction head 323 is placed vertically, or as shown in FIG. Fig.12 As shown, it is placed horizontally on the piezoelectric vibrator 322 to provide line friction between the driving component 30 and the movable carrier 20. The line contact between the friction head 323 and the wear-resistant part 26 of the movable carrier 20 has greater friction than the point contact method, and has better driving force and driving effect.

[0122] The number of friction heads 323 may be one or two or more. In the present embodiment, the piezoelectric vibrator 322 is in the shape of a rectangular strip, and the friction head 323 is protrudingly arranged at the center position of the side of the piezoelectric vibrator 322 facing the movable carrier 20, which can increase the unit driving stroke of the friction head 323. In another embodiment, the number of friction heads 323 is two, and the two friction heads 323 are arranged at intervals along the length direction of the piezoelectric vibrator 322, and the length direction of the piezoelectric vibrator 322 is parallel to the movement direction of the movable carrier 20 driven by it. In the driving direction along the driving assembly 30, at least two friction heads 323 are provided on the side of the piezoelectric vibrator 322 facing the movable carrier 20, thereby increasing the driving stroke.

[0123] 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.

[0124] The present application can also provide a camera module, which includes: the above-mentioned driving device, a lens assembly, and a photosensitive assembly, wherein the lens assembly is arranged in the driving device, and the photosensitive assembly is arranged relative to the lens assembly. Since the movable carrier 20 equipped with the optical lens can be adjusted smoothly, it is conducive to realizing the focusing function and improving the imaging quality.

[0125] 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 device, applied to a camera module, characterized in that: include: Fixed frame; A movable carrier, the movable carrier being movably arranged on the fixed frame; A driving assembly, the driving assembly is connected to the fixed frame and abuts against the movable carrier, applies a pre-pressure to the movable carrier, and is adapted to drive the movable carrier to move relative to the fixed frame when receiving a driving signal; A support assembly, wherein the support assembly comprises a first support member and a second support member, wherein the first support member abuts against the fixed frame and the movable carrier respectively, and a certain gap exists between the second support member and the fixed frame and / or the movable carrier.

2. The driving device according to claim 1, characterized in that: The supporting assembly and the driving assembly are arranged on the same side of the driving device.

3. The driving device according to claim 2, characterized in that: The first support member and the second support member are located on the same side of the driving assembly.

4. The driving device according to claim 3, characterized in that: The first support member is closer to the driving assembly than the second support member.

5. The driving device according to claim 2, characterized in that: The first supporting member and the second supporting member are located on two sides of the driving assembly.

6. The driving device according to any one of claims 2 to 5, characterized in that: Along the pre-pressure direction, the first support member, the second support member, and the driving assembly are arranged along a straight line.

7. The driving device according to claim 1, characterized in that: The movable carrier includes a first outer convex portion, the fixed frame includes a first inner convex portion, the first outer convex portion is arranged opposite to the first inner convex portion, and the first support member is arranged between the first outer convex portion and the first inner convex portion.

8. The driving device according to claim 7, characterized in that: The first outer convex portion is provided with a first guide portion, the first inner convex portion is provided with a second guide portion, the two sides of the first support member are respectively in contact with the first guide portion and the second guide portion, and the first guide portion, the second guide portion and the first support member cooperate to guide the movable carrier to move along the first direction.

9. The driving device according to claim 7 or 8, characterized in that: The movable carrier further includes a second outer convex portion, the fixed frame further includes a second inner convex portion, the second outer convex portion and the second inner convex portion are arranged opposite to each other, and the second support member is arranged between the second outer convex portion and the second inner convex portion.

10. The driving device according to claim 9, characterized in that: A third guide portion is provided on the second outer convex portion, a fourth guide portion is provided on the second inner convex portion, the second support member is arranged between the third guide portion and the fourth guide portion, and the third guide portion, the fourth guide portion and the second support member cooperate to provide a certain space for adjustment of the movable carrier.

11. The driving device according to claim 1, characterized in that: The first support member and the second support member are both guide rods, the guide rods are arranged along a first direction, and at least two protrusions suitable for contacting the guide rods are arranged on the movable carrier at intervals along the first direction.

12. The driving device according to claim 1, characterized in that: The driving assembly includes a pre-stressing assembly and an actuating assembly, wherein the pre-stressing assembly is connected to the fixed frame, and the actuating assembly is connected to the pre-stressing assembly, wherein the pre-stressing assembly provides pre-stress to the actuating assembly so that the driving end of the actuating assembly abuts against the movable carrier and the pre-stressing is applied to the movable carrier, so that the actuating assembly is suitable for driving the movable carrier to move relative to the fixed frame when receiving a driving signal.

13. The driving device according to claim 12, characterized in that: The pre-pressing assembly includes a structural member and a buffer member, wherein the structural member is connected to the fixing frame, and the buffer member is arranged between the structural member and the actuating assembly and is suitable for being deformed by being squeezed by the structural member and the actuating assembly.

14. A camera module, characterized in that: include: The driving device according to any one of claims 1 to 13; A lens assembly, arranged in the driving device; as well as The photosensitive component is arranged relative to the lens component.

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