Driving device and camera module thereof

Abstract

The application discloses a driving device and a camera module thereof. The driving device comprises: a movable part for carrying an optical lens, the optical lens defining an optical axis, the movable part comprising opposite first and second movable side walls, wherein the second movable side wall has a slot; a fixed part, the movable part being movably arranged in the fixed part; a piezoelectric actuator in frictional contact with the top of the first movable side wall for driving the movable part to move along the optical axis direction; a pre-pressing part arranged on the top of the piezoelectric actuator and applying a pre-pressing force on the first movable side wall perpendicular to the optical axis direction; a damping structure comprising a damping support and a damping part, the damping support being arranged in the fixed part, the damping part extending from the plane where the damping support is located towards the second movable side wall, at least a part of the damping part extending into the slot of the second movable side wall.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of camera modules, in particular to a driving device, a camera module and an assembling method thereof. BACKGROUND

[0002] At present, with the continuous development of electronic devices towards miniaturization and high performance, as one of the standard configurations of electronic devices, the requirements of users for the small size and high imaging capability of camera modules also become more and more strict. In order to further improve the user experience, the industry is actively improving the compact design and functional integration of camera modules. Through technical innovation and functional integration, the industry is continuously promoting the development of camera modules towards more compact and intelligent directions, further realizing the functions of automatic focusing, zooming, anti-shake and telephoto.

[0003] Periscopic camera module is a special camera module that changes the path of light through a light path turning element, so that it can be placed horizontally in electronic devices such as mobile phones, solving the problem of excessive height of long-focus camera module caused by excessive total length of long-focus lens. This design enables the camera to provide longer focal length and higher zoom capability without increasing the thickness of the module. SUMMARY

[0004] One object of the present application is to provide a driving device and a camera module thereof, which buffers on the side without a piezoelectric actuator, blocks the movement of the movable part, buffers the impact caused by the collision of the movable part, and reduces noise.

[0005] Another object of the present application is to provide a driving device and a camera module thereof, which helps to prevent the optical lens from overturning, and further enhances the stability of the optical lens.

[0006] Another object of the present application is to provide a driving device and a camera module thereof, which optimizes the assembling process of the camera module, simplifies the assembly difficulty, and further shortens the production time.

[0007] To achieve the above objects, the technical scheme adopted by the present application is a driving device for a periscopic camera module, comprising:

[0008] a movable part for carrying an optical lens, the optical lens defining an optical axis, the movable part comprising opposite first and second movable side walls, wherein the second movable side wall has a slot;

[0009] a fixed part, the movable part being movably arranged in the fixed part;

[0010] a piezoelectric actuator in frictional contact with a top of the first movable side wall for driving the movable part to move along the optical axis direction;

[0011] a pre-pressing member arranged on a top of the piezoelectric actuator and applying a pre-pressing force on the first movable side wall perpendicular to the optical axis direction;

[0012] a damping structure comprising a damping support arranged on the fixed part and a damping member extending from a plane where the damping support is located towards the second movable side wall, at least a part of the damping member extending into the slot of the second movable side wall.

[0013] As a preferred embodiment, the damping support comprises a main body part, two mounting parts at two ends of the main body part, the plane where the main body part is located is parallel to the optical axis direction, the plane where the mounting parts are located is perpendicular to the optical axis direction, the side connecting part extends from the plane where the main body part is located along a second direction, the plane where the side connecting part is located is perpendicular to the plane where the main body part is located and the plane where the mounting parts are located, wherein the second direction is perpendicular to the optical axis direction.

[0014] As a preferred embodiment, the fixed part comprises opposite first and second fixed side walls, the second fixed side wall has an opening, at least a part of the second movable side wall is located in the opening, the mounting parts are fixed to the second fixed side wall, and the main body part covers the opening.

[0015] As a preferred embodiment, the damping member comprises a first part connected to the main body part of the damping support and a second part connected to the first part, the second part is not in contact with the main body part of the damping support, wherein the length of the second part along the optical axis direction is less than the length of the first part along the optical axis direction.

[0016] As a preferred embodiment, the length of the second part along the optical axis direction is less than the length of the slot along the optical axis direction.

[0017] As a preferred embodiment, the height of the second part along the second direction is greater than the height of the first part along the second direction.

[0018] As a preferred embodiment, the height of the second part along the second direction is less than the height of the slot along the second direction.

[0019] As a preferred embodiment, along the second direction, at least a part of the main body part abuts against a top of the second fixed side wall, and at least a part of the main body part has a gap with a top of the second movable side wall.

[0020] As a preference, the first portion includes a top surface and a bottom surface opposite in the second direction, the bottom surface of the first portion having a gap with a top portion of the second movable sidewall.

[0021] As a preference, the slot of the second movable sidewall has an inner sidewall parallel to the second direction, the second portion of the damper has an inner surface parallel to the second direction, the inner sidewall and the inner surface have a gap therebetween.

[0022] As a preference, when the movable portion moves in the optical axis direction, the inner sidewall of the slot contacts the inner surface of the second portion, the second portion moves or deforms toward a side where the inner sidewall and the inner surface are not in contact under the action of the force.

[0023] To achieve one of the purposes of the present application, the technical solution adopted by the present application is a camera module, which comprises:

[0024] Any of the above driving devices;

[0025] A light turning element for turning incident light rays,

[0026] An optical lens held on the light turning path of the light turning element;

[0027] A photosensitive assembly for receiving light rays from the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The structure schematic diagram of the camera module in some embodiments of the present application.

[0029] Figure 2 The exploded structure schematic diagram of the camera module in some embodiments of the present application.

[0030] Figure 3 The exploded structure schematic diagram of the driving device in some embodiments of the present application.

[0031] Figure 4 The exploded structure schematic diagram of the camera module in some embodiments of the present application.

[0032] Figure 5 The cross-sectional structure schematic diagram of the driving device in the optical axis direction and the second direction in some embodiments of the present application.

[0033] Figure 6 The cross-sectional structure schematic diagram of the driving device in the optical axis direction and the second direction in some embodiments of the present application.

[0034] Figure 7This is a schematic diagram of the cross-sectional structure of the camera module in the first direction and the second direction in some embodiments of the present application.

[0035] Figure 8 This is a bottom-up schematic diagram of the camera module structure in some embodiments of the present application.

[0036] Figure 9 This is a bottom-up schematic diagram of the camera module structure in other embodiments of the present application.

[0037] Figure 10 This is a bottom-up schematic diagram of the camera module structure in some other embodiments of the present application.

[0038] Figure 11 for Figure 6 Schematic diagram of the assembly process of the first supporting portion, the second supporting portion and the fixing portion of the driving device in the illustrated embodiment.

[0039] Figure 12 for Figure 6 Schematic diagram of the assembly process of the movable part of the driving device in the embodiment shown.

[0040] Figure 13 for Figure 6 Schematic diagram of the assembly process of the piezoelectric actuator and pre-stressed member of the driving device in the embodiment shown.

[0041] Figure 14 for Figure 6 Schematic diagram of the assembly process of the pressing block and the pre-pressing member of the driving device in the embodiment shown.

[0042] Figure 15 This is an exploded schematic diagram of the upper cover and the fixing portion of the driving device in a modified embodiment of the present application.

[0043] Figure 16 This is an exploded diagram of a driving device in a modified embodiment of the present application with the upper cover removed.

[0044] Figure 17 Schematic cross-sectional view of the damping structure in some embodiments of the present application.

[0045] Figure 18 Schematic diagram of deformation of the damping structure in some embodiments of the present application.

[0046] Figure 19 Schematic diagram of the structure of the damping structure in some embodiments of the present application.

[0047] Figure 20 Schematic top view of the piezoelectric actuator, pre-pressing member, and pressing block of the driving device in a modified embodiment of the present application.

[0048] Figure 21Figure 6 is a bottom view of the piezoelectric actuator, the pre-pressing piece, and the pressing block of the driving device in a variant embodiment of the present application.

[0049] Figure 22 Figure 7 is a schematic view of the cross-sectional structure of the driving device in the optical axis direction and the second direction in a variant embodiment of the present application.

[0050] Figure 23 Figure 8 is a schematic view of the cross-sectional structure of the driving device in the first direction in a variant embodiment of the present application.

[0051] Figure 24 Figure 9 is a bottom view of the movable part of the driving device in a variant embodiment of the present application.

[0052] Figure 10 is a schematic view of the cross-sectional structure of the driving device in a variant embodiment of the present application. In the figure: 10, fixed part; 11, first fixed side wall; 111, first guide rail; 112, first accommodating groove; 113, second accommodating groove; 114, base extension; 1141, second mounting plane; 12, fixed main body; 13, second fixed side wall; 131, second guide rail; 132, opening; 14, conductive piece; 141, conductive part; 20, movable part; 21, first movable side wall; 211, first guide groove; 22, friction part; 23, second movable side wall; 231, second guide groove; 232, slotted groove; 2321, first inner side wall; 2322, second inner side wall; 30, piezoelectric actuator; 31, piezoelectric active part; 32, friction head; 33, conductive piece; 331, first connecting part; 333, second connecting part; 334, conductive part; 34, buffer piece; 40, pre-pressing piece; 41, fixed end; 411, fixed hole; 42, elastic part; 43, bent part; 50, pressing block; 51, lower pressing beam; 52, lower pressing arm; 521, lower pressing fixed platform; 522, lower pressing mounting platform; 523, first mounting plane; 524, mounting column; 500, recess; 61, first support part; 62, second support part; 70, magnetic attraction assembly; 71, first magnetic attraction piece; 711, base part; 712, support part; 72, second magnetic attraction piece; 80, light sensing assembly; 90, light turning element; 100, optical lens; 3331, first sub-connecting part; 3332, second sub-connecting part; 335, shaping piece; 421, connecting hole; 44, intermediate connecting piece; 441, connecting column; 53, structure reinforcing piece; 120, upper cover; 150, damping structure; 151, damping support; 1511, main body part; 1512, mounting part; 1513, side connecting part; 152, damping piece; 1521, first part; 1522, second part; 15221, first inner surface; 15222, second inner surface. DETAILED DESCRIPTION

[0053] Hereinafter, the present application will be further described with reference to the specific embodiments, it should be noted that the following described embodiments or technical features can be combined with each other to form new embodiments, without conflict.

[0054] In the description of the present application, it should be noted that, for the orientation words, such as the terms "center", "transverse", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0055] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence.

[0056] The terms "include" and "have" and any variations thereof in the specification and claims of the present application are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not have to be limited to those clearly listed steps or units, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] According to an aspect of the present application, a driving device for a camera module is provided, such as Figures 1 to 24As shown, the driving device can be applied to camera modules, especially to periscope camera modules that require a large motor driving force. Furthermore, the driving device includes a movable part 20, a fixed part 10, a piezoelectric actuator 30, a pre-pressed part 40, a pressure block 50 and a damping structure 150, wherein the movable part 20 is used to support the optical lens 100, and the optical lens 100 defines an optical axis. The movable part 20 includes a first movable side wall 21 and a second movable side wall 23 opposite to each other, wherein the second movable side wall 23 has a groove 232; the movable part 20 is movably arranged in the fixed part 10; the piezoelectric actuator 30 and the top friction of the first movable side wall 21 The piezoelectric actuator 30 is provided on the first movable sidewall 21 and is used to drive the movable portion 20 to move along the optical axis. The pre-compression member 40 is disposed on top of the piezoelectric actuator 30 and applies a pre-compression force perpendicular to the optical axis to the first movable sidewall 21. The damping structure 150 includes a damping bracket 151 and a damping member 152. The damping bracket 151 is disposed on the fixed portion 10. The damping member 152 extends from the plane of the damping bracket 151 toward the second movable sidewall 23. At least a portion of the damping member 152 extends into the slot 232 of the second movable sidewall 23. The present application provides a damping structure 150 to provide a buffer on the side without the piezoelectric actuator 30, thereby preventing the movable portion 20 from further moving, absorbing and buffering the impact caused by the collision of the movable portion 20, and reducing noise.

[0058] Among them, such as Figure 1 As shown, the optical lens 100 defines an optical axis, which is perpendicular to the first direction and the second direction. Specifically, the first direction is defined as the width direction of the periscope camera module arranged along the Y axis, the second direction is defined as the height direction of the periscope camera module arranged along the Z axis, and the optical axis direction is defined as the length direction of the periscope camera module arranged along the X axis. In particular, along the second direction, the periscope camera module includes relative top and bottom parts, and along the optical axis direction, the periscope camera module includes relative light incident side and light exit side. It can be understood that the setting of this coordinate system is also applicable to other variant embodiments of the present application.

[0059] In some embodiments, the piezoelectric actuator 30 is arranged on the top of at least a portion of the movable part 20 along a second direction, at least a portion of the pre-pressing member 40 is clamped between the piezoelectric actuator 30 and the pressing block 50 along the second direction, the pressing block 50 controls the deformation of the pre-pressing member 40 to generate a pre-pressing force along the second direction, and the piezoelectric actuator 30 and the movable part 20 abut under the action of the pre-pressing force, wherein the second direction is perpendicular to the optical axis direction. Since the pre-pressing member 40 and the pressing block 50 are arranged above the height direction of the camera module distributed along the Z axis, the pressing block 50 is coupled with the pre-pressing member 40, and the pressing block 50 is designed to be mounted on the fixed part 10 from the top. This helps to simplify the assembly process of the camera module, further reduces the inclination of the movable part 20 and the poor consistency of the camera module caused by assembly errors, and improves the imaging stability of the camera module. Further, the pressing block 50 can also adjust the deformation degree of the pre-pressing member 40 to adjust the size of the pre-pressing force, thereby improving the performance of the driving device. Further, the pressing block 50 can also protect the pre-pressing member 40, avoid interference between the pre-pressing member 40 and other components in the driving device during deformation, and further affect the performance of the pre-pressing member 40.

[0060] Reference Figure 2 , Figure 3 , Figure 15 and Figure 16 It can be known that, in some embodiments, the piezoelectric actuator 30 includes a piezoelectric active part 31 and a friction head 32 connected to each other. Due to the pre-pressing force of the pre-pressing member 40 downward along the second direction on the piezoelectric actuator 30, the movable part 20 and the friction head 32 in the piezoelectric actuator 30 are always in friction contact, which is beneficial to drive the movable part 20 to move along the optical axis direction after the piezoelectric active part 31 receives the voltage, reduces the shaking and inclination of the optical lens 100 during driving, and further improves the imaging precision and stability of the camera module during autofocus. It can be understood that, by keeping the movable part 20 and the friction head 32 in abutment with each other, the movable part 20 can move smoothly and quickly when driven, further improving the response speed of the movable part 20 to the piezoelectric actuator 30 and shortening the time consumed during focusing. Further, it is beneficial to improve the driving force provided by the piezoelectric actuator 30, enhance the stability of the camera module, reduce image jitter, and thus improve the imaging quality.

[0061] It should be understood that, during the process that the movable part 20 is driven to move along the optical axis direction by the piezoelectric actuator 30, since the piezoelectric actuator 30 is arranged on the same side of the first movable side wall 21 and on the opposite side of the second movable side wall 23, when the piezoelectric actuator 30 is stopped driving, the first movable side wall 21 can be timely stopped moving due to the self-locking function of the piezoelectric actuator 30, while the second movable side wall 23 has a tendency to continue moving due to inertia, or, in the case that the movable part 20 has already been tilted, the moving displacement of the second movable side wall 23 will be greater than that of the first movable side wall 21. In this way, not only the second movable side wall 23 will collide with the fixed part 10 and be easily damaged, but also the movable part 20 will be tilted, which will further affect the subsequent driving effect of the driving device. Further, when the driving device falls or collides, the self-locking function of the piezoelectric actuator 30 cannot resist the external impact, so that the movable part 20 may move under the action of the external impact force and collide with the fixed part 10.

[0062] To solve the above problems, as shown in Figure 15 , Figures 17 to 19 In the present application, a damping structure 150 is arranged, which comprises a damping bracket 151 and a damping member 152. The damping bracket 151 is arranged on the fixed part 10, and the damping member 152 extends from the plane where the damping bracket 151 is located towards the second movable side wall 23, so that the second movable side wall 23 can contact the damping member 152, and the impact caused by the contact of the second movable side wall 23 can be absorbed or eliminated by the damping member 152, and the noise can also be reduced. Specifically, the damping bracket 151 comprises a main body part 1511 and mounting parts 1512 located at both ends of the main body part 1511. The plane where the main body part 1511 is located is parallel to the optical axis direction, and the plane where the mounting parts 1512 are located is perpendicular to the optical axis direction. It should be understood that the mounting parts 1512 can be formed by bending the main body part 1511.

[0063] Further, the fixed part 10 comprises a first fixed side wall 11 located on the first side and a second fixed side wall 13 located on the second side. The first fixed side wall 11 and the second fixed side wall 13 are opposite to each other, the first fixed side wall 11 is opposite to the first movable side wall 21 of the movable part 20, and the second fixed side wall 13 is opposite to the second movable side wall 23 of the movable part 20. The second fixed side wall 13 has an opening 132, and at least a part of the second movable side wall 23 is arranged in the opening 132 of the second fixed side wall 13, so as to reduce the size of the driving device. In one embodiment, the top of the second fixed side wall 13 faces the socket at the top of the driving device, and the mounting parts 1512 are arranged in the socket to fix the damping bracket 151 to the second fixed side wall 13. In another embodiment, the second fixed side wall 13 and the mounting parts 1512 can also be integrally formed to fix the damping bracket 151 to the second fixed side wall 13.

[0064] The two mounting portions 1512 are respectively fixed to the portions of the second fixed side wall 13 near the light-in side and the light-out side, the main body portion 1511 extends between the two mounting portions 1512 along the optical axis direction, and the main body portion 1511 covers the opening 132 of the second fixed side wall 13 and is located at the top of the second movable side wall 23. In the second direction, at least a portion of the main body portion 1511 abuts against the top of the second fixed side wall 13, and at least a portion of the main body portion 1511 has a gap with the top of the second movable side wall 23 to provide sufficient space for the damping member 152.

[0065] In some embodiments, the damping member 152 is formed on the main body portion 1511 of the damping support 151 and extends from the main body portion 1511 towards the second movable side wall 23, so that at least a portion of the damping member 152 is accommodated in the gap between the main body portion 1511 and the top of the second movable side wall 23. The damping member 152 includes a first portion 1521 connected to the main body portion 1511 of the damping support 151 and a second portion 1522 connected to the first portion 1521, and the second portion 1522 is not in contact with the main body portion 1511. The first portion 1521 has a length along the optical axis direction and a height along the second direction, and the length of the first portion 1521 is greater than the height of the first portion 1521, for example, the length of the first portion 1521 is less than or equal to the length of the opening 132 of the second fixed side wall 13 along the optical axis direction, so that the first portion 1521 can fill the opening 132 as much as possible in the optical axis direction. As described above, when the driving device falls or collides, the movable portion 20 may move in the second direction under the impact force, causing the movable portion 20 to disengage from the fixed portion 10, and further causing the top of the movable portion 20 to collide with the upper cover 120. However, when the length of the first portion 1521 of the damping member 152 is long enough, regardless of the position of the movable portion 20 in the fixed portion 10, when the driving device falls or collides, the first portion 1521 of the damping member 152 can contact the movable portion 20, thereby absorbing or dissipating the impact and reducing the risk of damage to the movable portion 20, and also reducing noise.

[0066] Further, the first part 1521 of the damping member 152 comprises a top surface and a bottom surface opposite to each other in the second direction, wherein the bottom surface of the first part 1521 is spaced apart from the top of the second movable side wall 23, i.e. there is a gap between the bottom surface of the first part 1521 and the top of the second movable side wall 23, so that the top of the second movable side wall 23 does not contact the bottom surface of the first part 1521 in the normal working state of the driving device, avoiding the first part 1521 affecting the movement of the movable part 20. When falling or impact occurs, the bottom surface of the first part 1521 contacts the top of the second movable side wall 23, so as to buffer through the first part 1521.

[0067] In some embodiments, the second movable side wall 23 has a slot 232 with an opening towards the top of the driving device, and the second part 1522 of the damping member 152 extends from the first part 1521 towards the slot 232 of the second movable side wall 23, wherein at least a part of the second part 1522 of the damping member 152 is located in the slot 232 of the second movable side wall 23. In other words, in the direction of the optical axis, the second part 1522 of the damping member 152 overlaps the second movable side wall 23. Specifically, the slot 232 of the second movable side wall 23 has an inner side wall parallel to the second direction, and the second part 1522 of the damping member 152 has an inner surface parallel to the second direction. During the movement of the movable part 20 in the direction of the optical axis in the fixed part 10, the inner surface of the second part 1522 contacts the inner side wall of the slot 232, so as to limit the further movement of the second movable side wall 23 in the direction of the optical axis through the second part 1522 of the damping member 152, and also to absorb or dissipate the impact, reduce the risk of damage to the movable member, and also reduce the noise. Further, when the second movable side wall 23 contacts the second part 1522 of the damping member 152, the second part 1522 moves or deforms towards the side of the second movable side wall 23 which does not contact the second part 1522 under the action of force. Since the space of the side of the second movable side wall 23 which does not contact the second part 1522 is larger, the second part 1522 can deform more to absorb or dissipate the impact caused by the contact to a greater extent, and better reduce the noise.

[0068] The length of the second portion 1522 along the optical axis is less than the length of the first portion 1521 along the optical axis, so that the second portion 1522 can extend into the slot 232 of the second movable side wall 23. Further, the length of the second portion 1522 along the optical axis is less than the length of the slot 232 along the optical axis, so that there is a gap between the two inner surfaces of the second portion 1522 and the two inner side walls of the slot 232 when no collision occurs. The two inner surfaces of the second portion 1522 can include a first inner surface 15221 and a second inner surface 15222, and the two inner side walls of the slot 232 include a first inner side wall 2321 and a second inner side wall 2322, the first inner surface 15221 is opposite to the first inner side wall 2321 along the optical axis, and the second inner surface 15222 is opposite to the second inner side wall 2322 along the optical axis. It can be understood that when the movable part 20 moves towards the light-emitting side along the optical axis, the first inner surface 15221 contacts the first movable side wall 21, the second portion 1522 of the damping member 152 moves or deforms towards the light-emitting side, and since the distance between the second inner surface 15222 and the second movable side wall 23 increases, the second portion 1522 can absorb or dissipate the impact caused by contact to a greater extent through greater deformation, which can better reduce noise. Similarly, when the movable part 20 moves towards the light-entering side along the optical axis, the second portion 1522 can also absorb or dissipate the impact caused by contact to a greater extent through greater deformation, which can better reduce noise.

[0069] In some embodiments, the height of the second portion 1522 along the second direction is greater than the height of the first portion 1521 along the second direction. On the one hand, it can avoid increasing the gap between the top of the second movable side wall 23 and the damping bracket 151 due to the increase in the height of the first portion 1521, thereby avoiding increasing the height of the driving device. On the other hand, it can ensure that the second portion 1522 can extend into the slot 232 of the second side wall, so that the second portion 1522 can collide with the inner side walls of the slot 232 of the second side wall. Further, the height of the second portion 1522 along the second direction is less than the height of the slot 232 along the second direction, so as to avoid interference between the second portion 1522 and the slot 232. Further, it can be understood that if the height of the second portion 1522 along the second direction is too large, the second portion 1522 is likely to contact the inner side walls of the slot 232 and interfere with each other when the second portion 1522 is deformed under the action of external force, thereby affecting the buffering effect.

[0070] In some embodiments, the damping support 151 further comprises a side connecting portion 1513, wherein the plane where the side connecting portion 1513 is located is perpendicular to the plane where the main body portion 1511 is located and the plane where the mounting portion 1512 is located. The side connecting portion 1513 is bent from the plane where the main body portion 1511 is located to the side of the second fixed side wall 13 in the second direction at the middle of the main body portion 1511, and the side connecting portion 1513 is fixedly connected with the side of the second fixed side wall 13. As known from the foregoing, when the driving device falls or collides, the second movable side wall 23 may move in the second direction to collide with the first portion 1521 and the damping support 151, and when the damping support 151 is fixed to the fixed portion 10 only through the mounting portions 1512 at both ends, the middle of the main body portion 1511 of the damping support 151 may be deformed due to the impact, thereby affecting the buffering effect of the damping member 152. In order to avoid the above situation, the present application connects the damping support 151 and the second fixed side wall 13 at the middle of the main body portion 1511 through the side connecting portion 1513, which can prevent the main body portion 1511 from being deformed, thereby maintaining the flatness of the main body portion 1511 and avoiding affecting the buffering effect of the damping member 152.

[0071] In some embodiments, the first portion 1521 and the second portion 1522 of the damping member 152 can comprise elastic materials, flexible materials or injection materials. For example, the first portion 1521 and the second portion 1522 can be formed of various materials including rubber, polyurethane, porous and sponge. In various embodiments, the first portion 1521 and the second portion 1522 can be formed of the same material, or can be formed of different materials.

[0072] With reference to Figure 5 , Figure 6 and Figure 22 , in some embodiments, the fixed portion 10 is provided with a first accommodating groove 112 and a second accommodating groove 113, the first accommodating groove 112 and the second accommodating groove 113 are located on the same side of the fixed body 12 in the second direction, the first accommodating groove 112 is communicatively located at the upper portion of the second accommodating groove 113, the pressing block 50 is arranged in the first accommodating groove 112, and one side of the movable portion 20 is accommodated in the second accommodating groove 113, wherein the size of the first accommodating groove 112 in the optical axis direction is greater than the size of the second accommodating groove 113 in the optical axis direction. Specifically, since the length of the first accommodating groove 112 in the optical axis direction is greater than the length of the second accommodating groove 113 in the optical axis direction, the pressing block 50 accommodated in the first accommodating groove 112 can be fixed to the fixed portion 10, further increasing the stability and reliability of the pressing block 50. Further, the pressing block 50 is arranged in the first accommodating groove 112, the movable portion 20 is arranged in the second accommodating groove 113, and the pre-pressing member 40 and the piezoelectric actuator 30 are sequentially arranged between the pressing block 50 and the movable portion 20, so that the structure is more compact, and the space utilization rate inside the camera module is increased.

[0073] It can be understood that the length of the second accommodating groove 113 along the optical axis direction is greater than the length of the movable part 20 along the optical axis direction, so as to provide a space for at least a part of the movable part 20 to move along the optical axis direction when being driven by the piezoelectric actuator 30 in the second accommodating groove 113.

[0074] Further, as shown in Figure 22 The pressing block 50 can further include a structural reinforcement 53 embedded therein to enhance the structural strength of the pressing block 50, and the structural reinforcement 53 is exposed from the side surface of the pressing block 50. It can be understood that the structural reinforcement 53 can be embedded in the pressing beam 51 and the pressing arm 52, or only embedded in the pressing beam 51. It can be understood that the structural reinforcement 53 can further be fixed with a damping material by means of glue bonding or one-piece forming, and the damping material can be formed between the pressing arm 52 of the pressing block 50 and the movable part 20 to prevent the movable part 20 and the pressing arm 52 from directly colliding, thereby avoiding the deformation of the pressing arm 52 to affect the pre-pressing force generated by the pre-pressing part 40.

[0075] Further, the structural reinforcement 53 includes a horizontal reinforcement structure embedded in the pressing beam 51 and a vertical reinforcement structure embedded in the pressing arm 52, and the damping material is formed on the vertical reinforcement structure to be opposite to the light-entering side and / or the light-exiting side of the movable part 20. When the movable part 20 moves along the optical axis direction, the first movable side wall 21 can be in contact with the damping material to limit the further movement of the first movable side wall 21 along the optical axis direction through the damping material, and also can absorb or eliminate the impact, reduce the risk of damage to the movable part, and also can reduce the noise.

[0076] In some embodiments, as shown in Figure 4 and Figure 16As shown, the driving device further comprises a first support part 61, which is arranged between the fixed part 10 and the movable part 20 along the second direction, and the upper part and the bottom part of at least a portion of the movable part 20 are respectively kept in frictional contact with the piezoelectric actuator 30 and the first support part 61. In the driving device, the pre-pressing piece 40, the piezoelectric actuator 30, the movable part 20 and the first support part 61 are sequentially clamped between the pressing block 50 and the fixed part 10 along the second direction, wherein the first support part 61 provides an upward supporting force along the second direction for the movable part 20, the pre-pressing piece 40 is deformed under the joint action of the first support part 61 and the pressing block 50, and then the pre-pressing piece 40 provides a downward pre-pressing force along the second direction. It can be understood that if the pressing block 50 and the fixed part 10 are not fixed, the pre-pressing piece 40 and the pressing block 50 will move upward along the second direction under the action of the first support part 61, causing the pressing block 50, the pre-pressing piece 40 and the piezoelectric actuator 30 to be separated from the movable part 20, and then the pre-pressing piece 40 cannot be deformed and cannot generate a pre-pressing force, affecting the driving. In order to avoid the above situation, the pressing block 50 and the fixed part 10 are fixedly connected in the present application, and then the pressing block 50 will generate a downward pressing force along the second direction under the action of the first support part 61 due to the connection with the fixed part 10. On the one hand, it can avoid the separation of the pre-pressing piece 40 and the pressing block 50; on the other hand, it can maintain the deformation of the pre-pressing piece 40, and then ensure the generation of the pre-pressing force. The direction of the pre-pressing force is the same as the direction of the pressing force, the direction of the pressing force is opposite to the direction of the supporting force, and the direction of the pre-pressing force is opposite to the direction of the supporting force. It can be understood that if only the pre-pressing force acts on the top of the single-sided movable part 20, it may increase the risk of overturning of the movable part 20. Therefore, in order to keep the force balance of the movable part 20, the first support part 61 provides a supporting force opposite to the direction of the pre-pressing force to the movable part 20 to balance the pre-pressing force and reduce the risk of overturning of the movable part 20.

[0077] In some embodiments, the pre-pressing piece 40 is deformed under the action of the pressing block 50 and the first support part 61 to generate a pre-pressing force, and the direction of the pre-pressing force is the same as the direction of the pressing force. Under the action of the pre-pressing force, the friction head 32 and the first movable side wall 21 of the movable part 20 always keep frictional contact, which is beneficial to the piezoelectric actuator 30 to generate stable driving force.

[0078] In some embodiments, with reference to Figures 7 to 10 , Figure 16 and Figure 23As shown, the driving device further comprises a second support part 62, which is arranged between the fixed part 10 and the movable part 20 along a second direction, and the second support part 62 and the first support part 61 are oppositely arranged on both sides of the bottom of the fixed part 10 along a first direction, the first direction is perpendicular to the second direction and the optical axis direction, the fixed part 10 comprises opposite first and second sides, the first support part 61 is arranged on the first side close to the piezoelectric actuator 30, and the first support part 61 is clamped between the movable part 20 and the fixed part 10 in a tight fit, and the second support part 62 is arranged on the second side away from the piezoelectric actuator 30, and the second support part 62 is clamped between the movable part 20 and the fixed part 10 in a loose fit.

[0079] Since the pre-pressing part 40 is only arranged on one side of the movable part 20, the support force provided by the second support part 62 to the bottom of the other side of the movable part 20 further balances the pre-pressing force generated on one side of the movable part 20, which on the one hand avoids excessive friction force generated by the surface contact between the movable part 20 and the fixed part 10, resulting in poor driving effect, and on the other hand, the arrangement of the second support part 62 is conducive to improving the parallelism of the movable part 20 during movement, further improving the stability of the optical lens 100 and enhancing the imaging quality of the camera module.

[0080] It can be understood that the first support part 61 is simultaneously tightly fitted and abuts between the fixed part 10 and the movable part 20, while the second support part 62 is loosely fitted between the fixed part 10 and the movable part 20, so there is a certain gap between the second support part 62 and the fixed part 10 and / or the movable part 20, and the existence of this gap can provide a certain preset space for adjusting the position of the movable part 20. In other words, when the movable part 20 is driven by the piezoelectric actuator 30, the first support part 61 always provides stable support to the movable part 20 to ensure the parallelism of the movable part 20 during movement. In the case of inclination of the movable part 20, the gap at the second support part 62 can provide a certain amount of space for adjusting the position of the movable part 20. Moreover, when the movable part 20 is inclined to a certain extent, it abuts the fixed part 10 and the movable part 20, which can correct the movement state of the movable part 20 to avoid further inclination, thereby avoiding the influence of the inclination of the movable part 20 on the driving performance. Further, this arrangement facilitates assembly, the tight fit is conducive to the installation and positioning of the movable part 20, and the loose fit facilitates the adjustment of the movable part 20, further reducing assembly tolerance and improving the assembly precision of the camera module. It can be understood that in the present application, the inclination of the movable part 20 includes: inclination of the movable part 20 around the optical axis direction to generate a rotational movement trend, inclination of the movable part 20 around the first direction to generate a rotational movement trend, and inclination of the movable part 20 around the second direction to generate a rotational movement trend.

[0081] In some embodiments, the first support part 61 and the second support part 62 can also be tightly fitted and abutted between the fixed part 10 and the movable part 20 at the same time, so as to always provide stable support to the movable part 20 through the first support part 61 and the second support part 62, so as to ensure the parallelism when the movable part 20 moves, and reduce the risk of the movable part 20 being tilted.

[0082] Further, when the movable part 20 is driven to move along the optical axis direction, the main support part is the first support part 61, and the straight-line distance from the contact point of the friction head 32 and the movable part 20 to the first support part 61 is less than the straight-line distance from the contact point of the friction head 32 and the movable part 20 to the second support part 62. Since the first support part 61 is tightly fitted, the straight-line distance from the contact point of the friction head 32 and the movable part 20 to the first support part 61 is the value of the force arm corresponding to the overturning moment of the movable part 20. By reducing the force arm value, the overturning moment value is further reduced, so as to avoid the risk of the movable part 20 being tilted. Further, the above-mentioned tightly fitted and loosely fitted assembly methods can be considered by the tolerance value in the assembly process. For example, the tolerance of the first support part 61 and the movable part 20, the fixed part 10 is small, for example, 0.01, while the tolerance of the second support part 62 and the movable part 20, the fixed part 10 is large, for example, 0.02. At this time, when the movable part 20 does not have the tilting phenomenon, the first support part 61 provides support to the movable part 20, and when the movable part 20 has the tilting phenomenon, the second support part 62 provides support to the movable part 20 to right the movable part 20. In this way, the possibility of the movable part 20 being tilted can be reduced to a certain extent, which helps to improve the imaging quality of the camera module.

[0083] In some embodiments, with reference to Figure 2 、 Figure 7 、 Figure 16 、 Figure 23As shown, the first movable side wall 21 on the first side and the second movable side wall 23 on the second side are oppositely arranged along the first direction, and the pressing block 50, the pre-pressing piece 40 and the piezoelectric actuator 30 are sequentially arranged on the top of the first movable side wall 21 along the second direction. The first movable side wall 21 is provided with a first guide groove 211 and a friction part 22, the first guide groove 211 is opened on the bottom surface of the first movable side wall 21 and oppositely arranged with the first guide rail 111 along the second direction, the first support part 61 is installed between the first guide rail 111 and the first guide groove 211, so that the bottom surface of the first movable side wall 21 abuts against the first support part 61, the friction part 22 is installed on the top surface of the first movable side wall 21 and abuts against the friction head 32 of the piezoelectric actuator 30, and the first movable side wall 21 is accommodated in the second accommodation groove 113. The second movable side wall 23 is provided with a second guide groove 231, the second guide groove 231 is opened on the bottom surface of the second movable side wall 23 and oppositely arranged with the second guide rail 131 along the second direction, and the second support part 62 is installed between the second guide rail 131 and the second guide groove 231, so that the bottom surface of the second movable side wall 23 abuts against the second support part 62. By assembling the support part structure between the guide rail and the guide groove structure, the support part is stably clamped between the movable part 20 and the fixed part 10, thereby increasing the stability of the camera module.

[0084] In some embodiments, the fixed part 10 further comprises a first fixed side wall 11 on the first side, a second fixed side wall 13 on the second side and a fixed main body 12 connecting the first fixed side wall 11 and the second fixed side wall 13, and the first fixed side wall 11 and the second fixed side wall 13 are oppositely arranged on the two sides of the fixed main body 12 along the second direction respectively. The first accommodation groove 112 and the second accommodation groove 113 are opened in the first fixed side wall 11 along the second direction, and the first accommodation groove 112 and the second accommodation groove 113 are located on the top of the first fixed side wall 11, so that the pressing block 50 abuts against the top of the first fixed side wall 11, and the bottom of the first fixed side wall 11 is provided with the first guide rail 111, and the bottom of the second fixed side wall 13 is provided with the second guide rail 131. Among them, the first support part 61 is installed on the first guide rail 111 and supports the first side of the movable part 20, and the second support part 62 is installed on the second guide rail 131 and supports the second side of the movable part 20, and the arrangement of the first support part 61 and the second support part 62 can reduce the friction resistance when the movable part 20 is driven to move, which is beneficial to improve the driving performance in the camera module. The first guide rail 111 and the second guide rail 131 are flushly arranged on the two sides of the fixed part 10 along the first direction, so that the first support part 61 and the second support part 62 are flushly arranged along the first direction, thereby providing smooth support for the movable part 20. Further, as shown in FIG. 1, the first guide rail 111 and the second guide rail 131 are arranged on the two sides of the fixed main body 12 along the first direction, and the first support part 61 and the second support part 62 are flushly arranged along the first direction, thereby providing smooth support for the movable part 20. Figure 4As shown, since the piezoelectric actuator 30 drives the movable part 20 at the top of the movable part 20, only the first support part 61 and the second support part 62 arranged at the bottom of the movable part 20 can stably support the movable part 20, and further make the movable part 20 have better stability when being driven along the optical axis. In other words, when the piezoelectric actuator 30 drives the movable part 20, the support part arranged at the bottom of the movable part 20 and the opposite side of the piezoelectric actuator 30 can clamp the movable part 20 between the piezoelectric actuator 30 and the support part, so as to avoid the phenomenon that the piezoelectric actuator 30 causes the movable part 20 to tilt during driving. Further, the support part does not need to be additionally arranged at the side or top of the movable part 20, thereby reducing the number of support parts arranged in the camera module, optimizing the assembly process, further reducing the assembly tolerance and increasing the assembly consistency.

[0085] Specifically, when the friction force between the support part and the fixed part 10 and the movable part 20 is generated, the motion state of the support part is uncertain, and the support part can be in a rolling state or a sliding state, so that the friction force between the support part and the movable part 20 can change. Since the support part can randomly switch the motion state, reducing the number of support parts can reduce the risk of the movable part 20 tilting or overturning and the support part being stuck, and enhance the imaging performance of the camera module.

[0086] In some embodiments, the driving device further comprises an insert arranged at the abutting surface of the first guide rail 111 and the first support part 61, so as to provide a more flat support surface for the first support part 61. Further, the insert of the first guide rail 111 has the same shape as the first guide rail 111, for example, the first guide rail 111 is a V-shaped groove, and the structure of the insert can also be V-shaped; the first guide rail 111 is a U-shaped groove, and the structure of the insert can also be U-shaped, or the structure of the insert can also be a plane. On the one hand, it helps to slow down the wear of the first support part 61 when moving inside the first guide rail 111, prolonging the service life of the first support part 61; it can also reduce the risk of the first support part 61 being stuck during use, further improving the use quality and life of the camera module. On the other hand, it further enhances the use reliability of the camera module by slowing down the deformation phenomenon such as indentation of the first support part 61 caused by excessive force under the action of the pre-pressure.

[0087] In some embodiments, the driving device further comprises an inner insert embedded in the abutting surface of the second guide rail 131 and the second support portion 62, so as to enhance the support effect of the second support portion 62. The inner insert of the second guide rail 131 has the same shape as the second guide rail 131, for example, the second guide rail 131 is a V-shaped groove, and the inner insert can also have a V-shaped structure; the second guide rail 131 is a U-shaped groove, and the inner insert can also have a U-shaped structure, or the inner insert can also have a flat structure. By providing the inner insert structure, on the one hand, it helps to reduce the wear of the second support portion 62 when moving inside the second guide rail 131, prolonging the service life of the second support portion 62; it can also reduce the risk of the second support portion 62 being stuck during use, further improving the use quality and service life of the camera module.

[0088] In some embodiments, the first guide groove 211 and the second guide groove 231 in the movable portion 20 and the abutting surface of the support portion structure are also provided with an inner insert structure. That is, the first support portion 61 respectively contacts the inner insert in the first guide groove 211 and the inner insert provided in the first guide rail 111, and the second support portion 62 respectively contacts the inner insert in the second guide groove 231 and the inner insert provided in the second guide rail 131. By providing the inner insert structure, the wear of the first support portion 61 when moving between the first guide rail 111 and the first guide groove 211, and the wear of the second support portion 62 when moving between the second guide groove 231 and the second guide rail 131 are reduced, further improving the use quality and service life of the camera module. On the other hand, it reduces the deformation phenomenon such as dents of the first support portion 61 and the second support portion 62 caused by excessive force, further enhancing the use reliability of the camera module.

[0089] As shown in Figure 8 and Figure 9 In some embodiments, the first support portion 61 and the second support portion 62 are respectively at least two support portions spaced apart along the optical axis direction, and the spacing of the at least two support portions of the first support portion 61 is greater than the spacing of the at least two support portions of the second support portion 62, so as to provide a larger support area on the same side of the piezoelectric actuator 30. It can be understood that the first support portion 61 is assembled inside the first guide groove 211, and the second support portion 62 is assembled inside the second guide groove 231. As mentioned above, the length of the second movable side wall 23 along the optical axis direction can be less than the length of the first movable side wall 21 along the optical axis direction, so as to provide sufficient movement space for the first support portion 61 and the second support portion 62. The support portion can be implemented as a ball or a sliding block.

[0090] In some embodiments, the movable part 20 and / or the fixed part 10 are provided with guiding structures, such as guiding grooves or guiding rail structures, suitable for mounting the support parts, and since the support parts are arranged along the optical axis direction, the movable part 20 can be guided to move along the optical axis direction. It can be understood that the inner side of the guiding grooves or guiding rails are provided with metal inserts, which can help to reduce the wear of the support parts when moving along the inner side of the guiding grooves or guiding rails, reduce the risk of the support parts being stuck during use, and further improve the use quality and service life of the camera module.

[0091] In some embodiments, the first support part 61 can be implemented as a plurality of support parts arranged along the optical axis direction in sequence. It can be understood that, on the one hand, increasing the number of support parts can improve the stability and carrying capacity of the movable part 20, so that the movable part 20 is more stable when moving along the optical axis direction; on the other hand, since the movement state of a single support part is uncertain, the support parts can be in a rolling state or a sliding state, and increasing the number of support parts can compensate for the movement state between the support parts. Further, the second support part 62 can be implemented as a plurality of support parts arranged along the optical axis direction in sequence, so that the two opposite sides of the movable part 20 are subjected to balanced support. Specifically, the number of support parts included in the first support part 61 is greater than or equal to 3, and the number of support parts included in the second support part 62 is greater than or equal to 3.

[0092] Specifically, since the movable part 20 moves along the optical axis direction, the first support part 61 and the second support part 62 are arranged between the movable part 20 and the fixed part 10 to support the self-gravity of the movable part 20. In order to further maintain the stability of the optical lens 100, the first support part 61 and the second support part 62 are arranged as much as possible along the first direction relative to the optical axis on both sides of the bottom of the movable part 20, for providing as much as possible symmetrical support force for the movable part 20, and thereby reducing the risk of the movable part 20 being inclined.

[0093] It can be understood that, since the second movable side wall 23 is not provided with the piezoelectric actuator 30 and the like, the length of the second movable side wall 23 in the optical axis direction does not need to be increased, in other words, the length of the second movable side wall 23 in the optical axis direction can be smaller than the length of the first movable side wall 21 in the optical axis direction, which is beneficial to increase the compactness of the driving device structure and further reduce the weight of the movable part 20 and the size of the driving device. The piezoelectric actuator 30 and the pre-pressing piece 40 are arranged at the top of the first movable side wall 21, which on the one hand makes the internal space of the camera module more reasonable, since the piezoelectric actuator 30 and the pre-pressing piece 40 both extend in the optical axis direction, and the first movable side wall 21 of the movable part 20 corresponding thereto also needs to extend in the optical axis direction, that is, the first movable side wall 21 needs to have a certain length to increase the driving stroke of the piezoelectric actuator 30. Further, the first support part 61 is arranged at the bottom surface of the first movable side wall 21, and there can be more space to arrange the first support part 61 to provide a larger support area through the first support part 61. On the contrary, since the piezoelectric actuator 30 does not need to be arranged on one side of the second movable side wall 23, a shorter length can be arranged to provide sufficient installation space for the second support part 62. In this way, on the one hand, not only can the compactness of the lens driving device structure be enhanced, but also the size of the lens driving device can be reduced. On the other hand, since the optical focusing stroke in the periscopic camera module is large, this design is also helpful to ensure that the first support part 61 and the second support part 62 always stably support the movable part 20 in the long stroke. Since the optical focusing stroke in the camera module is large, this design is helpful to ensure that the support part always effectively supports the movable part 20 in the long stroke.

[0094] As Figure 24As shown, in a variant embodiment of the present application, the first support part 61 and the second support part 62 are respectively arranged on both sides of the optical axis in the first direction. The first support part 61 is arranged on the bottom surface of the first movable side wall 21 of the movable part 20, and the second support part 62 is arranged on the bottom surface of the second movable side wall 23 of the movable part 20. The number of support parts of the first support part 61 is greater than the number of support parts of the second support part 62, and the length of the first support part 61 along the optical axis is greater than the length of the second support part 62 along the optical axis, so that the movable part 20 has more support positions in the first support part 61. It can be understood that the piezoelectric actuator 30 and the pre-pressing piece 40 are located at the top of the first support part 61, the number of support parts of the first support part 61 is large, and the force (at least including the pre-pressing force generated by the pre-pressing piece 40) acting on the first support part 61 can be dispersed by more support parts, thereby reducing the force on each support part and reducing the risk of pits on the surface of the movable part 20 and the fixed part 10 in contact with the first support part 61. Correspondingly, the length of the first movable side wall 21 along the optical axis is greater than the length of the second movable side wall 23 along the optical axis to provide more space for the first support part 61. While the second movable side wall 23 is arranged shorter along the optical axis, the structural compactness of the driving device can be enhanced, and the size of the driving device can be reduced.

[0095] Specifically, when the number of support parts of the first support part 61 is greater than or equal to 3, for example, 8, the two support parts located at both ends along the optical axis have the largest height dimension along the second direction, that is, the height dimension of the other support parts along the second direction is less than or equal to the height dimension of the two support parts located at both ends of the first support part 61; the number of support parts of the second support part 62 is 1, and the height dimension of the one support part of the second support part 62 along the second direction is equal to the height dimension of the two support parts located at both ends of the first support part 61.

[0096] More specifically, in this embodiment, the first support part 61 is fitted inside the first guide groove 211, and the second support part 62 is fitted inside the second guide groove 231. The number of support parts of the first support part 61 is large, which can reduce the risk of pits on the first guide groove 211 or the first guide rail 111. Correspondingly, the length of the first guide groove 211 along the optical axis is greater than the length of the second guide groove 231 along the optical axis.

[0097] It is worth mentioning that in the variant, the size of the pressure block 50 along the optical axis is greater than the size of the first support portion 61 along the optical axis, and in the optical axis direction, the projection of the first support portion 61 along the second direction is entirely within the projection range of the pressure block 50 along the second direction, so that the pre-pressing force on the plurality of support portions in the first support portion 61 is more uniform. Further, the size of the pressure block 50 along the optical axis is also greater than the size of the first guide groove 211 along the optical axis, and in the optical axis direction, the projection of the first guide groove 211 along the second direction is entirely within the projection range of the pressure block 50 along the second direction, so that even if the position of the first support portion 61 in the first guide groove 211 changes, the projection of the first support portion 61 along the second direction in the optical axis direction can still be entirely within the projection range of the pressure block 50 along the second direction.

[0098] As mentioned above, the pressure block 50 can provide a deformation space for the pre-pressing member 40, maintain the deformation of the pre-pressing member 40, and adjust the size of the pre-pressing force generated by the pre-pressing member 40. Since the first support portion 61 is located on the same side of the pressure block 50 and the pre-pressing member 40 relative to the optical axis, the pre-pressing force can act more directly on the first support portion 61, and the adjustment of the pre-pressing force by the pressure block 50 can also directly act on the first support portion 61. By the projection of the first support portion 61 along the second direction being entirely within the projection range of the pressure block 50 along the second direction, on the one hand, the pre-pressing member 40 and the first support portion 61 are closely matched in spatial position by the pressure block 50 to generate pre-pressing force and support force; on the other hand, the first support portion 61 is within the range of the pressure block 50 during driving, reducing the risk of overturning of the movable portion 20 and improving the stability of the driving device; on the other hand, the pre-pressing force adjusted by the pressure block 50 can be dispersed by the plurality of support portions of the first support portion 61, so that the force on each support portion is more uniform, and especially when falling or impact occurs, the plurality of support portions can disperse the impact force to reduce the risk of dents in the first support portion 61, further, the pressure block 50 can also protect the first support portion 61 in its original position, avoiding the first support portion 61 from being separated, affecting the reliability of the driving device.

[0099] It is worth mentioning that in the deformed embodiment, the imaginary line of the direction of the pre-pressing force acting on the movable part 20 intersects with the connecting line between the first supporting part 61, which is conducive to reducing the overturning moment value and further reducing the risk of the optical lens 100 tilting. Specifically, the position of the friction head 32 of the piezoelectric actuator 30 acting on the first movable side wall 21 is aligned with the cross-sectional center of the first supporting part 61 in the second direction, which is conducive to the pre-pressing force applied by the pre-pressing part 40 being directly and stably applied to the first supporting part 61, increasing the stability of the pre-pressing force transmission, thereby reducing the error phenomenon caused by misalignment of the components and improving the reliability of the camera module. Further, this alignment helps to reduce the local excessive wear of the first supporting part 61, thereby prolonging the service life of the camera module, reducing the overturning moment value, and further reducing the risk of the optical lens 100 tilting.

[0100] It is worth mentioning that in this embodiment, the supporting part can be implemented as a ball, a roller or a sliding block and the like suitable for rolling or sliding.

[0101] Referring to Figure 2 , Figure 16 and Figure 22 , in some embodiments, the movable part 20 further comprises a friction part 22, which is arranged on the first movable side wall 21 of the movable part 20 and faces the side where the friction head 32 is located, so that the friction head 32 of the piezoelectric actuator 30 is frictionally coupled to the friction part 22 under the action of the pre-pressing force of the pre-pressing part 40. It can be understood that the provided friction part 22 helps to increase the friction force between the movable part 20 and the friction head 32 of the piezoelectric actuator 30, and further enhances the driving force provided by the piezoelectric actuator 30.

[0102] In some embodiments, the friction part 22 can be integrally formed on the first movable side wall 21 of the movable part 20, or the friction part 22 and the movable part 20 can be independent components, so that the friction part 22 is attached to the first movable side wall 21 of the movable part 20 by an adhesive, thereby forming a split structure with the movable part 20. It can be understood that the provision of the friction part 22 helps to enhance the friction force between the movable part 20 and the friction head 32 of the piezoelectric actuator 30, which is conducive to improving the driving performance in the camera module. Of course, the friction part 22 can also be attached to the first movable side wall 21 of the movable part 20 by spraying, plating or the like.

[0103] Referring to Figure 2 , Figure 5 , Figure 6 , Figure 16 and Figure 22As shown, in some embodiments, at least a part of the friction part 22 and the bottom of the movable part 20 are kept in friction contact with the piezoelectric actuator 30 and the first supporting part 61 respectively, and the first supporting part 61 provides a supporting force in the second direction upward for the movable part 20 under the action of the pressing block 50, wherein the direction of the pressing force generated by the pressing block 50 is opposite to the direction of the supporting force. In order to further avoid the inclination of the movable part 20, a supporting part is arranged between the fixed part 10 and the movable part 20 to provide support and guidance for the stable movement of the movable part 20 along the optical axis direction in the fixed part 10, thereby enhancing the stability of the optical lens 100 during the optical focusing and / or optical zooming of the camera module, and further improving the imaging quality of the camera module.

[0104] It can be understood that the piezoelectric actuator 30 in the present application is arranged at the upper part of the friction part 22 in the second direction and drives the movable part 20 at the top of the movable part 20, the pre-pressing piece 40 provides a pre-pressing force downward in the second direction at the top of the piezoelectric actuator 30 so that the friction head 32 is in friction contact with the friction part 22 of the movable part 20, and the piezoelectric actuator 30 provides a driving force for the movable part 20 to drive the movable part 20 to move along the optical axis direction. Further, the first supporting part 61 arranged between the fixed part 10 and the movable part 20 provides a supporting force upward in the second direction for the movable part 20, and the supporting force is opposite to the pre-pressing force, which is beneficial to prevent the phenomenon that the friction force is too large to be unfavorable for driving due to the face contact between the movable part 20 and the fixed part 10.

[0105] In some embodiments, as shown, Figure 3 The pressing block 50 includes a pressing cross beam 51 and a pressing arm 52, the pressing arm 52 extends from both ends of the pressing cross beam 51 to the fixed part 10 in the second direction, so that the pressing block 50 is fixed in the first accommodating groove 112 of the fixed part 10, and the pressing cross beam 51 and the pressing arm 52 have a groove 500 therebetween, which is adapted to provide a deformation space for the pre-pressing piece 40. The pressing arm 52 includes a pressing mounting platform 522 and a pressing fixed platform 521, the pressing fixed platform 521 is located outside the pressing mounting platform 522 along the optical axis direction, and the length of the pressing fixed platform 521 in the second direction is greater than the length of the pressing mounting platform 522 in the second direction, so that the groove 500 is formed between the pressing mounting platform 522 and the pressing cross beam 51, the pre-pressing piece 40 is mounted on the pressing mounting platform 522, and the pressing fixed platform 521 is fixed to the fixed part 10, which further simplifies the assembly process, enhances the stability of the camera module, improves the installation stability of the pre-pressing piece 40, and thereby enhances the stability of the provided pre-pressing force.

[0106] The recess 500 of the pressing block 50, the first accommodating groove 112 and the second accommodating groove 113 are communicated, at least a part of the pre-pressing piece 40 and the movable part 20 are clamped between the pressing block 50 and the fixed part 10, and at least a part of the pre-pressing piece 40 and the movable part 20 are located in the space communicated by the recess 500, the first accommodating groove 112 and the second accommodating groove 113. It can be understood that when the pressing block 50 is pressed more in the second direction, the clamping of at least a part of the pre-pressing piece 40 and the movable part 20 will be tighter, the deformation of the pre-pressing piece 40 will be greater, and the pre-pressing force generated by the pre-pressing piece 40 will be greater. In other words, the pressing block 50 not only provides a deformation space for the pre-pressing piece 40 and maintains the deformation of the pre-pressing piece 40, but also adjusts the size of the pre-pressing force generated by the pre-pressing piece 40, for example, by moving the pressing beam 51 downward in the second direction towards the movable part 20 to further press the pressing block 50, thereby increasing the pre-pressing force of the pre-pressing piece 40.

[0107] In some embodiments, the first fixed side wall 11 of the fixed part 10 further comprises a base extension 114 and a second mounting plane 1141, the second accommodating groove 113 is formed between the two base extensions 114, the top surfaces of the two base extensions 114 respectively form a second mounting plane 1141, and the two pressing fixed platforms 521 of the pressing arm 52 respectively abut against the two second mounting planes 1141. It can be understood that the pressing arm 52 can be connected to the fixed part 10, and the two pressing fixed platforms 521 of the pressing arm 52 can abut against the two second mounting planes 1141 of the fixed part 10, further enhancing the stability and reliability of the pressing block 50. Since the pressing beam 51 and the pressing mounting platform 522 are located in different height planes, the recess 500 formed provides a reserved space for the deformation of the pre-pressing piece 40. Further, by fixing the pressing block 50 to the fixed part 10, adjustments can be made during assembly, thereby reducing the risk of inconsistent assembly.

[0108] In some embodiments, as shown in Figure 3 、 Figure 6 、 Figure 20 、 Figure 21 and Figure 22 , when the pre-pressing piece 40 is subjected to the supporting force provided by the first supporting part 61, the pre-pressing piece 40 generates a curved deformation protruding upward and generates a pre-pressing force downward in the second direction, thereby providing a pre-pressing force downward in the second direction to the movable part 20, so that the friction head 32 in the piezoelectric actuator 30 and the movable part 20 are frictionally connected to each other, further providing a stable driving force. It can be understood that the flatness and consistency of the pre-pressing piece 40 are relatively good, which helps to reduce the variation of the pre-pressing piece 40.

[0109] In some embodiments, the pre-pressing member 40 is an elastic member capable of generating deformation, so as to provide a pre-pressing force for driving the movable part 20 to maintain frictional contact with the piezoelectric actuator 30 after deformation, so that the friction head 32 in the piezoelectric actuator 30 is in contact with the friction part 22 of the movable part 20 under the action of the pre-pressing force and generates a frictional force, thereby driving the movable part 20 to move. Specifically, in one example, as shown in Figure 5 the pre-pressing member 40 is a spring with a bending structure, which will generate a bending deformation protruding upward and generate a downward pre-pressing force after being acted on by the pressing block 50 and the first support part 61. It can be understood that, since the pre-pressing member 40 will generate a certain tolerance during assembly, the spring with a bending structure is less affected by the tolerance fluctuation within a certain pre-pressing force range, and the pre-pressing force provided by the spring with a bending structure is more consistent.

[0110] In some embodiments, as shown in Figure 3 , Figure 20 and Figure 21 the pre-pressing member 40 includes a fixed end 41, an elastic part 42, and a bending part 43, wherein the number of the fixed end 41 and the bending part 43 is two, the two bending parts 43 are respectively arranged between the two fixed ends 41 and the elastic part 42 and respectively connect the elastic part 42 and the two fixed ends 41, the two fixed ends 41 are fixed to the pressing block 50, and the elastic part 42 is in abutment with the piezoelectric driving part 31. It can be understood that the elastic part 42 and the bending part 43 can also be provided with a hollow structure, which further reduces the elastic coefficient, thereby helping to reduce the influence of material tolerance, assembly tolerance, or other displacement fluctuations on the pre-pressing force.

[0111] Further, when the pre-pressing member 40 is a spring, as shown in Figure 5 the spring can be bent during manufacturing to have a certain amount of deformation. Thus, after the spring is installed with the piezoelectric actuator 30 and the pressing block 50 during assembly, the amount of deformation of the spring itself exerts a pre-pressing force on the piezoelectric actuator 30 and the movable part 20. In other words, the spring is pre-deformed before the subsequent assembly and fixing process, which exerts a greater pre-pressing force on the movable part 20, which is beneficial to improve the driving effect.

[0112] In some embodiments, as shown in Figure 6 , Figure 18 and Figure 22As shown, the pre-pressing piece 40 has a flat spring structure. It can be understood that the deformation of the pre-pressing piece 40 is caused by the cooperation of the pressing block 50 and the first supporting part 61 before the piezoelectric actuator 30 is driven. The pre-pressing piece 40 includes a fixed end 41 and an elastic part 42. The fixed end 41 is fixed to the pressing block 50, and the elastic part 42 is in abutment with the piezoelectric active part 31. When the pre-pressing piece 40 is acted on by the pressing block 50 and the first supporting part 61, the elastic part 42 of the pre-pressing piece 40 will produce a bending deformation protruding upward and generate a downward pre-pressing force. The presence of the pre-pressing force is conducive to maintaining the frictional contact between the friction head 32 and the movable part 20 to generate a stable frictional force. The piezoelectric actuator 30 further drives the movable part 20 to move, thereby enhancing the driving effect. It can be understood that, in the above case, the middle part of the pre-pressing piece 40 is higher than the two ends, protruding away from the piezoelectric actuator 30, that is, the elastic part 42 of the pre-pressing piece 40 is higher than the two fixed ends 41.

[0113] In some embodiments, as shown in FIG. 1, the pre-pressing piece 40 is in abutment with the piezoelectric active part 31. The piezoelectric active part 31 is in abutment with the first supporting part 61. The first supporting part 61 is in abutment with the pressing block 50. The pressing block 50 is in abutment with the fixed part 10. The fixed part 10 is in abutment with the first movable side wall 21 of the movable part 20. The movable part 20 is in abutment with the friction head 32. The friction head 32 is in abutment with the second movable side wall 22 of the movable part 20. Figure 6 As shown, the deformation amount of the pre-pressing piece 40 is related to the length of the downward pressing arm 52 of the pressing block 50 along the second direction. In other words, in the case where the first movable side wall 21 of the movable part 20 and the thickness of the piezoelectric actuator 30 along the second direction are determined, when the length of the downward pressing arm 52 along the second direction is smaller, the pressing block 50 needs to be further moved downward along the second direction to connect the downward pressing arm 52 with the fixed part 10. At this time, the first supporting part 61 is pressed downward by the downward pressing beam 51 more strongly, so that the first supporting part 61 provides a larger supporting force to the pre-pressing piece 40, thereby increasing the deformation amount of the pre-pressing piece 40 and further generating a larger pre-pressing force. When the length of the downward pressing arm 52 along the second direction is larger, the pressing block 50 needs to be moved downward along the second direction to a smaller extent, resulting in a smaller deformation amount of the pre-pressing piece 40 and further reducing the generated pre-pressing force. It can be understood that the length of the downward pressing arm 52 along the second direction cannot be too small, so as to avoid generating a too large supporting force and pre-pressing force, which further causes damage to the piezoelectric actuator 30 and can also cause the first supporting part 61 to be excessively pressed and thus generate pits. In other words, the length of the downward pressing arm 52 along the second direction cannot be too large, so as to prevent the pre-pressing piece 40 from generating a smaller deformation amount and providing a smaller pre-pressing force to the movable part 20 when the length of the downward pressing arm 52 along the second direction is too large, which cannot meet the requirement of driving the movable part 20 to move. On the other hand, increasing the length of the downward pressing arm 52 along the second direction increases the height of the camera module along the second direction, thereby reducing the portability of the camera module.

[0114] In some embodiments, as shown in FIG. 1, the pre-pressing piece 40 is in abutment with the piezoelectric active part 31. The piezoelectric active part 31 is in abutment with the first supporting part 61. The first supporting part 61 is in abutment with the pressing block 50. The pressing block 50 is in abutment with the fixed part 10. The fixed part 10 is in abutment with the first movable side wall 21 of the movable part 20. The movable part 20 is in abutment with the friction head 32. The friction head 32 is in abutment with the second movable side wall 22 of the movable part 20. Figure 3 , Figure 21As shown, each lower pressing mounting platform 522 of the pressing block 50 is provided with a first mounting plane 523 and a mounting column 524, the mounting column 524 protrudes from the first mounting plane 523 to the fixed end 41 of the pre-pressing piece 40 respectively, so that the fixed end 41 of the pre-pressing piece 40 is fixed below the first mounting plane 523 through the mounting column 524. Since the flat lower surface (first mounting plane 523) provided on the lower pressing mounting platform 522 helps to provide a flat mounting plane for the pre-pressing piece 40, it avoids causing the phenomenon that the left and right sides of the pre-pressing piece 40 are not of the same height, and further avoids increasing the variation of the pre-pressing piece 40 to provide inconsistent pre-pressing force to the movable part 20.

[0115] It can be understood that the mounting columns 524 provided on both sides of the lower pressing mounting platform 522 correspond to the fixing holes 411 provided on the fixed end 41 of the pre-pressing piece 40, so that during assembly, the mounting columns 524 can extend into the fixing holes 411, thereby fixing the pre-pressing piece 40 to the lower pressing mounting platform 522. Specifically, during fixing, the mounting columns 524 and the fixing holes 411 can be directly riveted and fixed, or the pre-pressing piece 40 can be pre-fixed by applying adhesive to the surface of the fixed end 41 of the pre-pressing piece 40 and the surface of the lower pressing mounting platform 522, and then fixed by using the mounting columns 524 and the fixing holes 411 using riveting. Further enhance the stability of the pre-pressing piece 40 and the pressing block 50 during installation and use, which is conducive to maintaining the stability of the provided pre-pressing force.

[0116] In some embodiments, the pre-pressing piece 40 can be installed on the pressing block 50 first, and then the lower pressing arm 52 is fixed to the first fixed side wall 11 of the fixed part 10 after the pressing block 50 is turned over, which further optimizes the assembly process of the pre-pressing piece 40 and the pressing block 50, increases the assembly efficiency, and reduces the assembly difficulty. It can be understood that during the assembly process, the piezoelectric actuator 30 and the pre-pressing piece 40 are assembled as a semi-finished product first, and then the pre-pressing piece 40 with the piezoelectric actuator 30 is used for the next step of assembly. If the pre-pressing piece 40 is directly assembled on the fixed part 10, it is necessary to ensure that the friction head 32 of the piezoelectric actuator 30 and the position of the movable part 20 are aligned at all times during the assembly process, otherwise the friction contact position between the friction head 32 and the movable part 20 may be offset after the assembly is completed, thereby affecting the driving effect, and due to the characteristics of the pre-pressing piece 40, it is also difficult to adjust the pre-pressing piece 40 during the assembly process. Compared with the above-mentioned manner, the pre-pressing piece 40 is installed on the pressing block 50 first, and then the lower pressing arm 52 is fixed to the fixed part 10 after the pressing block 50 is turned over, which does not need to keep the position of the friction head 32 and the movable part 20 aligned at all times during the assembly process of the pre-pressing piece 40, and the assembly difficulty is reduced. Moreover, by installing the pre-pressing piece 40 on the pressing block 50, the position and assembly between the pressing block 50 and the fixed part 10 can be adjusted to adjust the pre-pressing piece 40, and the adjustability is higher.

[0117] As Figure 8As shown, in some embodiments, two first guide grooves 211 are spaced apart and arranged on the bottom surface of the first movable side wall 21 along the optical axis direction, and two second guide grooves 231 are spaced apart and arranged on the bottom surface of the second movable side wall 23 along the optical axis direction. The distance between the farthest endpoints of the two first guide grooves 211 is greater than the distance between the farthest endpoints of the two second guide grooves 231.

[0118] Due to the effect of the pre-pressure, the friction head 32 drives the friction part 22 on the first movable side wall 21, increases the length of the first movable side wall 21 of the movable part 20 along the optical axis direction, and increases the length of the friction part 22 arranged on the first movable side wall 21 along the optical axis direction, thereby increasing the moving stroke of the movable part 20. Further, the piezoelectric actuator 30 and the first support part 61 are arranged on the first movable side wall 21. Since the piezoelectric actuator 30 and the pre-pressure part 40 both extend along the optical axis direction, the corresponding first movable side wall 21 also needs to extend along the optical axis direction. In other words, the first movable side wall 21 has a certain length along the optical axis direction, so there is more space on the bottom side of the first movable side wall 21 to arrange the first support part 61. In order to further improve the balance of the structure, the distance between the first support parts 61 can be appropriately increased. Specifically, the first guide grooves 211 and the second guide grooves 231 can be circular, rectangular, hemispherical, U-shaped, V-shaped, pyramid-shaped, etc.

[0119] In some embodiments, two first guide grooves 211 are spaced apart and arranged on the bottom surface of the first movable side wall 21 along the optical axis direction, the first support part 61 is mounted in the first guide groove 211 and the first guide rail 111, and two second guide grooves 231 are arranged on the bottom surface of the second movable side wall 23 along the optical axis direction, and the second support part 62 is adapted to be mounted in the second guide groove 231 and the second guide rail 131, which is conducive to improving the mounting stability of the support part and optimizing the assembly process.

[0120] Further, since the support part structure is assembled inside the guide groove structure, as the distance between the two first guide grooves 211 increases, the distance between the two support parts of the first support part 61 assembled in the two first guide grooves 211 also increases, which in turn makes the support area formed by the connection line of the first support part 61 and the second support part 62 larger, thereby reducing the risk of tilting of the movable part 20 during movement.

[0121] In some embodiments, as Figure 6As shown, along the second direction, the projection of the friction part 22 and the projection of the line connecting the two farthest endpoints of the first guide groove 211 overlap with each other, and the projection of the friction part 22 and the projection of the two support parts of the first support part 61 overlap with each other, which is conducive to inhibiting the risk of the movable part 20 tilting in the left-right direction and the front-back direction. Therefore, as the distance between the two support parts of the first support part 61 increases, a larger support area is provided for the movable part 20, and a stable support force is provided in the entire movement stroke of the movable part 20, reducing the possibility of the movable part 20 tilting in the front-back direction. In other words, the length of the friction part 22 along the optical axis direction is less than the distance between the two farthest endpoints of the first guide groove 211 along the optical axis direction.

[0122] In some embodiments, the first support part 61 and the second support part 62 respectively include two ball bearings for providing a smooth support force for the movable part 20. Further, each ball bearing is arranged in a single guide groove, thereby avoiding interference between the two ball bearings. It can be understood that the greater the distance between the two ball bearings of the first support part 61 and the second support part 62 arranged along the optical axis direction, the smoother the support force provided for the movable part 20, further enhancing the stability and reliability of the optical lens 100. When the distance between the two ball bearings of the first support part 61 is greater than the distance between the two ball bearings of the second support part 62, the support area composed of the ball bearings is increased, and the stability of the optical lens 100 is increased.

[0123] In some embodiments, the projection of the friction head 32 of the piezoelectric actuator 30 along the second direction and the projection of the line connecting the first support part 61 overlap with each other along the second direction, further reducing the tilting moment value and reducing the risk of the movable part 20 tilting.

[0124] In some embodiments, the number of friction heads 32 of the piezoelectric actuator 30 is two, and the two friction heads 32 are arranged at intervals along the optical axis direction of the piezoelectric active part 31, wherein the distance between the two friction heads 32 of the piezoelectric actuator 30 is less than the distance between the two support parts of the first support part 61, which is conducive to reducing the deviation of the pre-pressing force, and further makes the pre-pressing force evenly distributed on the two support parts of the first support part 61, reducing the wear and damage of the first support part 61 caused by uneven pre-pressing force. Further, when the piezoelectric active part 31 causes the friction head 32 to move by generating vibration deformation, the angle between the friction head 32 and the abutting active part 20 changes with the movement, which causes the force generated between the friction head 32 and the active part 20 not to be always parallel to the optical axis direction, and the direction of the force may have a certain inclination angle relative to the plane in which the first active side wall 21 of the active part 20 is located. At this time, due to the action of the inclined force, the active part 20 may further appear to be inclined. Therefore, the greater the distance between the two support parts of the first support part 61, the greater the support area that can be provided to the active part 20, thereby reducing the overturning moment value and further reducing the risk of the active part 20 being inclined.

[0125] In some embodiments, the imaginary line of the action direction of the pre-pressing force on the active part 20 intersects the connecting line between the first support part 61, which is conducive to reducing the overturning moment value and further reducing the risk of the active part 20 being inclined.

[0126] In some embodiments, the position of the friction head 32 of the piezoelectric actuator 30 acting on the first active side wall 21 is aligned with the cross-sectional center of the first support part 61 in the second direction, which is conducive to the pre-pressing force applied by the pre-pressing part 40 being stably and directly applied to the first support part 61, increasing the stability during the transmission of the pre-pressing force, thereby reducing the error phenomenon caused by poor alignment of the components and improving the reliability of the camera module. Further, this alignment helps to reduce the local excessive wear of the first support part 61, prolonging the service life of the camera module while reducing the overturning moment value and further reducing the risk of the optical lens 100 being inclined.

[0127] As shown in the modified embodiment, Figure 24 the number of first guide grooves 211 provided on the first active side wall 21 is 1, and the number of second guide grooves 231 provided on the second active side wall 23 is also 1, and the length of the first guide groove 211 along the optical axis direction is greater than the length of the second guide groove 231 along the optical axis direction. It should be understood that the length of the first guide groove 211 along the optical axis direction can increase the number of support parts of the first support part 61 arranged in the first guide groove 211, and further increase the support area formed by the connecting line between the first support part 61 and the second support part 62, thereby reducing the risk of the active part 20 being inclined during movement.

[0128] Further, in this variant embodiment, as shown in Figure 22 viewed along the second direction, the projections of the friction heads 32 of the piezoelectric actuator 30 in the optical axis direction all fall on the first support portions 61. In this way, the risk of overturning of the movable portion 20 can be reduced, and it is also beneficial to make the pre-pressing force uniformly distributed on the first support portions 61, reducing the wear and damage of the first support portions 61 due to uneven pre-pressing force. More specifically, the number of the friction heads 32 of the piezoelectric actuator 30 is two, and the two friction heads 32 are arranged at intervals in the optical axis direction on the piezoelectric active portion 31, and the interval distance of the two friction heads 32 can be greater than the size of any one of the first support portions 61 in the optical axis direction. Viewed along the second direction, the projections of the two friction heads 32 in the optical axis direction all fall on the first support portions 61. Therefore, in some cases, the projections of all the friction heads 32 of the piezoelectric actuator 30 in the optical axis direction all fall on the first support portions 61 viewed along the second direction.

[0129] Correspondingly, in this variant embodiment, the projection of the friction portion 22 and the projection of the first guide groove 211 overlap viewed along the second direction, so that in the movement stroke of the movable portion 20, the projections of the friction heads 32 can all fall on the first support portions 61. More specifically, the length of the friction portion 22 in the optical axis direction is less than the length of the first guide groove 211 in the optical axis direction.

[0130] In some embodiments, as shown in Figure 8 , Figure 9 and Figure 24 , the first support portions 61 and the second support portions 62 are independent components that can be independently formed with respect to the movable portion 20 and the pressing block 50, and further, the first support portions 61 can be a multi-point structure arranged at intervals in the optical axis direction, such as a ball, a sliding block. The second support portions 62 can be a multi-point structure or a guide rail structure arranged at intervals in the optical axis direction, such as a ball, a sliding block or a guide rod. When a guide rod is used as a support assembly, the good linearity can increase the stability and reliability when the movable portion 20 is driven to move, further reducing the tilting or overturning phenomenon of the optical lens 100. Specifically, the second guide groove 231 assembled with the second support portions 62 can be trapezoidal, rectangular, V-shaped, etc.

[0131] It can be understood that when the first support part 61 is selected as a ball as a support structure, and the second support part 62 is selected as a guide rod as a support structure, the pressure generated to the second support part 62 in the second direction downward is mainly the magnetic attraction force provided by the magnetic attraction assembly 70, which is smaller than the pre-pressing force received by the first support part 61, wherein the pressure received by the first support part 61 includes the magnetic attraction force provided by the magnetic attraction assembly 70 and the pre-pressing force provided by the pre-pressing part 40. In this way, the friction force generated by the second support part 62 due to the surface contact can be reduced, and the power consumption of the piezoelectric actuator 30 can be further reduced. On the other hand, if the first support part 61 is selected as a guide rod as a support structure, due to the large pressure, the guide rod structure with a large friction coefficient will generate a large friction force due to the surface contact, which will affect the driving effect of the piezoelectric actuator 30. It can be understood that when the ball is used as the support part structure, the ball and the guide rail and the guide groove use point contact, which has the smallest rolling friction and the largest sliding friction, which is beneficial to the driving of the movable part 20.

[0132] In some embodiments, the first support part 61 and the second support part 62 are provided as a hemispherical structure fixed to the fixed part 10 and / or the movable part 20, which can also be a boss, using point contact friction, which is beneficial to reduce the wear of the guide groove or guide rail structure and prolong the service life of the camera module.

[0133] In some embodiments, as shown in Figure 9 , Figure 10 and Figure 23 , the driving device further includes a magnetic attraction assembly 70, the magnetic attraction assembly 70 includes a first magnetic attraction part 71 and a second magnetic attraction part 72, the first magnetic attraction part 71 is arranged on the main body of the fixed part 10, and the second magnetic attraction part 72 is arranged on the bottom of the movable part 20, the first magnetic attraction part 71 and the second magnetic attraction part 72 are oppositely arranged along the second direction and interact to generate a magnetic attraction force, which makes the movable part 20 and the fixed part 10 clamp the first support part 61 and the second support part 62. Wherein, referring to Figure 9 and Figure 10 , along the first direction, the distance from the second magnetic attraction part 72 to the second support part 62 is smaller than the distance from the second magnetic attraction part 72 to the first support part 61, and the magnetic attraction force and the pre-pressing force are in the same direction. Specifically, the second magnetic attraction part 72 is arranged in the second movable side wall 23 of the movable part 20, and the first magnetic attraction part 71 is arranged in the second fixed side wall 13 of the fixed part 10, and the first magnetic attraction part 71 and the second magnetic attraction part 72 are oppositely arranged along the second direction and interact to generate a magnetic attraction force. Wherein, referring to Figure 23As shown, along the first direction, the distance from the second magnetic attraction member 72 to the second support part 62 is greater than the distance from the second magnetic attraction member 72 to the first support part 61, and the directions of the magnetic attraction force and the pre-pressing force are the same. Specifically, the second magnetic attraction member 72 is arranged on the first movable side wall 21 of the movable part 20, the first magnetic attraction member 71 is arranged on the first fixed side wall 11 of the fixed part 10, and the first magnetic attraction member 71 and the second magnetic attraction member 72 are oppositely arranged along the second direction and generate a magnetic attraction force through interaction. Since the direction of the magnetic attraction force is the same as the direction of the pre-pressing force, the pre-pressing force and the magnetic attraction force are superimposed on each other, and in the case where the magnetic attraction force is insufficient to resist external force, the pre-pressing force can provide additional support. Further, since the magnetic attraction assembly 70 is arranged at the bottom of the movable part 20 and the piezoelectric actuator 30 is arranged at the top of the movable part 20, the support part can be arranged only at the bottom of the movable part 20 to achieve the support of the movable part 20, further reducing the positions of the support part that need to be arranged in the camera module.

[0134] It can be understood that, since the magnetic attraction assembly 70 is arranged at the bottom of the movable part 20 and the first movable side wall 21 is subjected to the pre-pressing force, the movable part 20 has a tendency to overturn, and therefore the magnetic attraction force needs to be arranged to reduce the risk of the movable part 20 overturning. Among them, the direction of the magnetic attraction force is the same as the direction of the pre-pressing force, along the first direction, the action point of the magnetic attraction force on the movable part 20 and the action point of the pre-pressing force on the movable part 20 are located on both sides of the optical axis, on the one hand, it is beneficial to make the movable part 20 tightly adhere to the fixed part 10, and enhance the stability of the camera module, on the other hand, the magnetic attraction force and the pre-pressing force cooperate with each other, further balance the force of the movable part 20, and help to reduce the optical lens 100 tilting phenomenon caused by the unbalanced moment of force.

[0135] In some embodiments, Figure 9 and Figure 10 , the second magnetic attraction member 72 is arranged in the middle region between the two second guide grooves 231 along the direction of the optical axis, so as to reduce the overturning moment value and further reduce the risk of the movable part 20 tilting.

[0136] In some embodiments, as Figure 10 shown, the first magnetic attraction member 71 is a metal magnetic yoke, the first magnetic attraction member 71 includes a base part 711 and a supporting part 712, at least a part of the base part 711 overlaps the projection of the second magnetic attraction member 72 along the second direction, and at least a part of the supporting part 712 overlaps the projection of the second support part 62 along the second direction. By arranging the first magnetic attraction member 71, on the one hand, the effect of the magnetic attraction force is enhanced, the pre-pressing force is better balanced, and the risk of the movable part 20 overturning is reduced; on the other hand, through the magnetic attraction force, the support part is stably clamped between the movable part 20 and the fixed part 10, the stability of the support part is improved, and the imaging quality of the camera module is improved.

[0137] In some embodiments, the first magnetic attraction member 71 comprises a base portion 711 and a supporting portion 712 which are integrally connected, thus improving the convenience of processing and increasing the processing efficiency. Further, the base portion 711 and the supporting portion 712 can be provided in a structure of separate bodies, which helps to improve the flatness of the base portion 711, but when the area of the base portion 711 is too large, the deformation phenomenon is prone to occur.

[0138] In some embodiments, the supporting portion 712 can be provided in a V-shaped or planar shape according to the shape of the first guide rail 111 and the second guide rail 131, and is arranged on the lower side of the first supporting portion 61 and / or the second supporting portion 62 in the second direction, so as to avoid the first supporting portion 61 and the second supporting portion 62 from generating pits, and further improve the use quality and service life of the camera module.

[0139] In some embodiments, the piezoelectric actuator 30 further comprises a conductive member 33 arranged between the piezoelectric active portion 31 and the pre-pressing member 40, as shown in Figure 3 、 Figure 20 and Figure 21 , the conductive member 33 comprises a first connecting portion 331, a second connecting portion 333 and a conductive portion 334. In the embodiment shown in Figure 3 , the first connecting portion 331 is a horizontal plate body arranged between the piezoelectric active portion 31 of the piezoelectric actuator 30 and the pre-pressing member 40 in the second direction, and the second connecting portion 333 is a vertical plate body integrally bent from the first connecting portion 331 in the second direction. The conductive portion 334 extends from the second connecting portion 333 in the optical axis direction along the outer peripheral wall of the fixing portion 10 and is connected to the through member 14 arranged on the fixing portion 10. In the embodiments shown in Figure 20 and Figure 21 , the first connecting portion 331 is a horizontal plate body arranged between the piezoelectric active portion 31 of the piezoelectric actuator 30 and the pre-pressing member 40 in the second direction, and the first connecting portion 331 can have a through hole to reduce the influence of the conductive member 33 on the piezoelectric active portion 31. The second connecting portion 333 is a vertical plate body integrally bent from the first connecting portion 331 in the second direction, and the conductive portion 334 extends from the second connecting portion 333 in the second direction along the outer peripheral wall of the fixing portion 10 and is connected to the through member 14 arranged on the fixing portion 10. Specifically, the second connecting portion 333 comprises a first sub-connecting portion 3331 and a second sub-connecting portion 3332, and the first sub-connecting portion 3331 and the second sub-connecting portion 3332 are respectively connected from both ends of the first connecting portion 331 in the optical axis direction and integrally bent in the second direction, and then the other ends of the first sub-connecting portion 3331 and the second sub-connecting portion 3332 are respectively connected to the conductive portion 334 in the second direction. Through the arrangement of the conductive member 33, the space utilization inside the camera module can be increased and electrical conduction can be realized.

[0140] Furthermore, the conductive member 33 further includes two shaping members 335 fixed to the outside of the bends of the first sub-connection portion 3331 and the second sub-connection portion 3332, respectively. The shaping members 335 are used to maintain the bends of the first sub-connection portion 3331 and the second sub-connection portion 3332. The shaping members 335 can be made of materials such as plastic or metal.

[0141] In some embodiments, the friction head 32 in the piezoelectric actuator 30 can directly contact the first movable side wall 21 of the movable part 20 without the friction part 22, thereby reducing the weight of the movable part 20 and further reducing the resistance required to drive the movable part 20.

[0142] refer to Figure 1 、 Figure 4 、 Figure 15 and Figure 16 As shown, in some embodiments, in addition to the flexible circuit board, the circuit assembly in the camera module also includes a conductive member 14 arranged around the outer peripheral wall of the fixed part 10. Specifically, the conductive member 14 is embedded in or externally placed on the first fixed side wall 11 and the second fixed side wall 13, and at least part of the conductive member 14 is exposed on the outer peripheral side of the fixed part 10. The conductive member 14 is provided with a conductive portion 141. The conductive member 14 is welded to the conductive portion 334 through the conductive portion 141 and electrically conductive. And the conductive member 14 is used to achieve the conduction of the circuit part of the photosensitive component 80, the light turning element 90 and other circuit modules in a simple electrical connection. Among them, as Figure 2 and Figure 15 The conductive member 14 with a bent structure shown is easy to connect and adapts to complex spatial layout and shape requirements, further enabling efficient wiring design in a small or irregular space, thereby improving space utilization.

[0143] Furthermore, one of the first magnetic member 71 and the second magnetic member 72 is a magnet, and the other is a magnet or a yoke suitable for adsorption with the magnet, and the magnet or the yoke can be fixed by adhesion, insert injection molding, riveting, etc. Since the first movable side wall 21 and the second movable side wall 23 of the movable part 20 are respectively subjected to pre-pressure and magnetic attraction, and the direction of the magnetic attraction is the same as the direction of the pre-pressure, it helps to reduce the risk of the movable part 20 tilting. Specifically, the pre-pressure can be greater than the magnetic attraction, because when the magnetic attraction is too large, the friction resistance that the movable part 20 needs to overcome when it is driven to move will also be greater, further increasing the power consumption of the piezoelectric actuator 30, which is not conducive to the driving of the movable part 20.

[0144] In some embodiments, the first magnetic member 71 is a magnet, and the second magnetic member 72 is an insert-molded yoke, which can also serve as the conducting member 14 to simplify the structure. Specifically, the yoke is designed in a metal strip, which is cut and shaped after manufacturing. This batch manufacturing method can further improve the production efficiency. Further, the yoke used in the present application has a large planar area. Increasing the metal pressing area during manufacturing can increase the planar regularity. Further, the yoke can be made of a material that is attracted to the magnet, such as metal, to further enhance the magnetic attraction and thus improve the stability of the optical lens 100.

[0145] In some embodiments, the magnetic assembly 70 further includes a first magnetic member 71 and a second magnetic member 72. The first magnetic member 71 on the movable part 20 and the second magnetic member 72 on the fixed part 10 interact with each other and generate a magnetic attraction force. Therefore, when the movable part 20 is driven along the optical axis, the magnetic attraction force generated by the magnetic assembly 70 can ensure that the movable part 20 is always supported by the supporting part during the long travel of the movable part 20, and the movable part 20 will not tilt to a large extent. Further, the magnetic attraction force generated by the magnetic assembly 70 on the second movable side wall 23 is in the same direction as the pre-pressing force generated by the pre-pressing member 40 on the first movable side wall 21, which is beneficial to improve the fit between the movable part 20 and the fixed part 10, further reduce the tilting of the movable part 20 caused by unbalanced torque, and further reduce the risk of tilting of the optical lens 100.

[0146] In some embodiments, as Figure 2 , Figure 3 , Figure 16 , Figure 20 , Figure 21 and Figure 22 As known from the foregoing, the piezoelectric actuator 30 includes a piezoelectric active part 31, a friction head 32, and a conductive member 33. The piezoelectric actuator 30 is in abutment with the movable part 20 under the action of the pre-pressing force. Specifically, the piezoelectric active part 31 is provided with the friction head 32 on the side facing the first movable side wall 21. The piezoelectric active part 31 generates mechanical resonance motion through the inverse piezoelectric effect. When the frequency of the applied voltage is consistent with the natural frequency of the piezoelectric active part 31, resonance occurs and ultrasonic waves are generated. Therefore, a deflection reciprocating motion or an elliptical motion can be achieved on a specifically configured electrode layer, so as to drive the friction head 32 to perform a deflection reciprocating motion or an elliptical motion, and thus drive the movable part 20 to slide relative to the fixed part 10 through the friction between the friction head 32 and the first movable side wall 21.

[0147] Referring to Figure 2 , Figure 3 , Figure 16 , Figure 20 and Figure 21It can be seen that in some embodiments, the piezoelectric actuator 30 further comprises a buffer member 34 arranged between the pre-pressing member 40 and the piezoelectric active part 31. Since the elastic modulus of the buffer member 34 is lower than that of the pre-pressing member 40, the buffer member 34 is more likely to deform, thereby being able to adaptively produce different degrees of shrinkage deformation according to different tolerances in different piezoelectric actuators 30, so as to make the pre-pressing force difference of each piezoelectric actuator 30 with different tolerances smaller. In other words, the buffer member 34 that can deform can offset the pre-pressing force change caused by at least part of the material tolerance and assembly tolerance, and can also absorb part of the deformation of the piezoelectric active part 31, the buffer member 34 can also absorb part of the vibration deformation of the piezoelectric active part 31, so as to stably maintain the parallelism of the piezoelectric active part 31 relative to the first movable side wall 21, and further protect the piezoelectric actuator 30 from excessive mechanical stress. It is worth mentioning that in a specific example, the buffer member 34 is arranged between the elastic part 42 of the pre-pressing member 40 and the piezoelectric active part 31.

[0148] It can be understood that the buffer member 34 can be an adhesive tape, one side of which is flatly bonded to the pre-pressing member 40, and the other side is bonded to the piezoelectric active part 31 or the components below the piezoelectric active part 31. The adhesive tape is easy to install and use, does not need to be cured, has good flatness, and is beneficial to maintaining the parallelism of the piezoelectric active part 31 relative to the first movable side wall 21. The size of the buffer member 34 can be smaller than, equal to, or greater than the size of the piezoelectric active part 31, so that the buffer member 34 fills between the piezoelectric active part 31 and the pre-pressing member 40. Similarly, the specific shape and number of the buffer member 34 are not limited in the present application, for example, two pieces of adhesive tape can be used as the buffer member 34, or two pieces of adhesive tape can be arranged in the second direction. Preferably, the size of the buffer member 34 is greater than the size of the piezoelectric active part 31, so that the area between the piezoelectric active part 31 and the pre-pressing member 40 is completely filled by the buffer member 34, which is beneficial to guarantee the connection structure strength of the pre-pressing member 40 and enhance the installation parallelism of the piezoelectric active part 31.

[0149] Specifically, the buffer member 34 can also be a low-modulus glue arranged on the surface of the piezoelectric active part 31. That is, since the buffer member 34 can be attached between the pre-pressing member 40 and the conductive member 33, it not only has the advantage of easy assembly, but also can avoid the problem that the vibration mode of the piezoelectric active part 31 is affected after the pre-pressing member 40 is bonded by using a UV adhesive or a heat-curing adhesive.

[0150] Further, as Figure 16 , Figure 20 and Figure 21As shown, the pre-pressing piece 40 further comprises an intermediate connecting piece 44 arranged between the elastic part 42 and the buffer piece 34. The intermediate connecting piece 44 is fixed to the elastic part 42, so that the elastic part 42 is fixed to the buffer piece 34 through the intermediate connecting piece 44. By arranging the intermediate connecting piece 44, on one hand, the fixation between the pre-pressing piece 40 and the piezoelectric actuator 30 becomes convenient, and on the other hand, the piezoelectric actuator 30 is provided with a flat mounting surface, and by adjusting the thickness dimension of the intermediate connecting piece 44 in the second direction, the height of the elastic part 42 in the second direction can be adjusted, and thus the size of the pre-pressing force provided by the pre-pressing piece 40 can be adjusted. Specifically, the intermediate connecting piece 44 can be first fixed to the elastic part 42, and then fixed to the piezoelectric actuator 30; or the intermediate connecting piece 44 can be first fixed to the piezoelectric actuator 30 through the buffer piece 34, and then fixed to the elastic part 42. Of course, the way of first fixing to the elastic part 42 can improve the convenience of fixation between the pre-pressing piece 40 and the piezoelectric actuator 30, and further forms a flat mounting surface for the pre-pressing piece 40. Here, the intermediate connecting piece 44 and the elastic part 42 can be fixed by means of glue, insert injection molding, riveting, etc. For example, in the embodiment shown in Figure 16 and Figure 22 the variant embodiment shown, the intermediate connecting piece 44 has two connecting columns 441 protruding towards the elastic part 42, and the elastic part 42 correspondingly forms two connecting holes 421, so that the two connecting columns 441 respectively pass through the two connecting holes 421 and are fixed by riveting. Here, the way of using connecting columns 441 and connecting holes 421 not only facilitates positioning, but also enables the connecting columns 441 to protrude through the connecting holes 421 from the elastic part 42, so that the connecting columns 441 can play a role in protecting the elastic part 42, preventing the elastic part 42 from directly impacting the pressing block 50.

[0151] As shown in Figure 2 , Figure 3 , Figure 16 and Figure 20 in some embodiments, the piezoelectric active part 31 is a substrate utilizing the inverse piezoelectric effect, which shrinks or expands according to the change of polarization direction and electric field direction. This effect means that when an electric field is applied in the polarization direction of a dielectric, the dielectric will produce a mechanical deformation phenomenon, so that the piezoelectric active part 31 can be polarized by applying an electric field in single crystal, polycrystalline ceramic, polymer, etc. materials, thereby generating ultrasonic oscillation. This oscillation can produce a pendulum reciprocating motion or an elliptical motion on a specially arranged electrode layer, thereby driving the friction head 32 to move correspondingly. It can be understood that the friction force between the friction head 32 and the outer side wall of the movable part 20 can drive the movable part 20 to move relative to the fixed part 10, so the driving force is actually the friction force between the friction head 32 and the movable part 20.

[0152] In one embodiment of the present application, the piezoelectric active part 31 adopts a multi-layer stacked structure. Specifically, the piezoelectric active part 31 is stacked by ceramic layers and electrode layers alternately in the thickness direction, and the order is ceramic layer, electrode layer, ceramic layer, electrode layer, ceramic layer, electrode layer, ceramic layer, and so on. Each electrode layer is located between two adjacent ceramic layers. When an electric field is applied between adjacent electrode layers, the ceramic layer will produce elongation or contraction deformation. By arranging multiple electrode layers, the voltage required to drive the piezoelectric active part 31 to bend and vibrate can be reduced. The number of electrode layers and ceramic layers can be selected according to specific needs, in other words, for example, the number of ceramic layers can be greater than or equal to the number of electrode layers. The ceramic layer is usually made of a material with a piezoelectric effect, such as PZT piezoelectric ceramic; and the electrode layer is made of a conductive material, such as copper, gold, silver or silver alloy, etc. The fixation between the multi-layer ceramic layer and the multi-layer electrode layer can be achieved by ceramic co-firing process, that is, a layer of ceramic slurry is laid, then a layer of electrode slurry is laid, and then they are heated and sintered together to form a laminated piezoelectric active part 31. In addition, by providing power to the multi-layer electrode layer, the multi-layer ceramic layer arranged between the multi-layer electrode layer can be polarized.

[0153] It can be understood that the side electrical connection parts in the camera module are respectively connected with the positive voltage and the negative voltage of the power supply, thereby respectively providing at least one electrode layer with positive voltage and at least one electrode layer with negative voltage, thereby polarizing the multi-layer ceramic layer, and the piezoelectric ceramic after polarization will automatically arrange into a piezoelectric direction, further generating a piezoelectric effect.

[0154] In some embodiments, in order to improve the driving performance of the piezoelectric actuator 30, the piezoelectric active part 31 can be made of piezoelectric ceramic material or piezoelectric single crystal material, and the piezoelectric active part 31 can be a single-layer ceramic body or a multi-layer ceramic body, or a single-layer single crystal body or a multi-layer single crystal body, such as lead zirconate titanate (PZT) based piezoelectric ceramic, potassium sodium niobate (KNN) based piezoelectric ceramic, barium titanate (BT) based piezoelectric ceramic, lead magnesium niobate-lead indium niobate (PMN-PT) based piezoelectric single crystal, etc.

[0155] In some embodiments, the plane of the piezoelectric active part 31 along the optical axis direction is rectangular, and the friction head 32 is protruded on the side of the piezoelectric active part 31 facing the movable part 20 along the second direction. Specifically, the number of friction heads 32 is two, and the two friction heads 32 are arranged along the optical axis direction. It can be understood that the piezoelectric actuator 30 drives the movable part 20 to move along the optical axis direction. Compared with driving the movable part 20 by only protruding a single friction head 32, the effect of driving the movable part 20 to move a long distance is better when two friction heads 32 are provided to cooperate with each other.

[0156] In some embodiments, the friction head 32 is made of wear-resistant material, for example, various high-hardness wear-resistant ceramic materials such as alumina, zirconia, silicon carbide ceramic, or high-wear-resistant metal materials, carbon fiber materials, or composite materials of ceramics, metal particles and polymers, etc. can be used. The use of wear-resistant materials can improve the wear resistance of the friction head 32, help to improve the friction force between the movable part 20 and the friction head 32, further enhance the driving force provided by the piezoelectric actuator 30, and due to the good wear resistance, it is beneficial to prolong the service life of the friction head 32. In addition, in some embodiments, the friction head 32 and the piezoelectric active part 31 can be an integrated structure or a detachable structure. The friction head 32 and the piezoelectric active part 31 can be fixed on the piezoelectric active part 31 by bonding, clamping, nesting, welding or fastener connection, etc. to ensure that the two are connected by surface contact to ensure the connection strength, and at the same time the friction head 32 can move significantly with the deformation of the piezoelectric active part 31.

[0157] In some embodiments, the piezoelectric active part 31 bends in the second direction in a mode of one wave crest and one wave trough. Since the position of the friction head 32 can be matched with the mode of the piezoelectric active part 31, the friction head 32 can be arranged at the position of the wave crest and the wave trough at the corresponding position. It can be understood that the shape of the friction head 32 can be a sphere, a hemisphere, a cuboid, a platform, a cylinder, a semi-cylinder, etc. The number of friction heads 32 can be one, two or more. In this application, the shape of the friction head 32, the number of the piezoelectric active part 31, the shape of the electrode, the connection mode between the friction head 32 and the piezoelectric active part 31, etc. are not limited.

[0158] Further, the driving device further comprises an upper cover 120 fixed above the fixed part 10 and forming a containing cavity to contain other components of the driving device.

[0159] In some embodiments of the present application, as Figure 1As shown, the camera module further comprises an optical system, which is assembled inside the fixed portion 10 due to the frame shape of the fixed portion 10. The optical system comprises, in sequence along the optical axis direction, a light turning element 90, an optical lens 100, and a photosensitive assembly 80, wherein the optical lens 100 is arranged on the light turning path of the light turning element 90, and the photosensitive assembly 80 is configured to receive the light transmitted from the optical lens 100 and perform imaging. Specifically, the light output direction of the light turning element 90, the axial direction of the optical lens 100, and the normal direction of the photosensitive assembly 80 are arranged along the optical axis direction. Among them, the light turning element 90 is located on the side close to the light incidence inside the fixed portion 10, the optical lens 100 is located in the central region inside the fixed portion 10, and the photosensitive assembly 80 is located on the side away from the light incidence inside the fixed portion 10. The camera module provided by the present application has the characteristics of easy assembly and good pre-pressure consistency in the camera module.

[0160] In some embodiments of the present application, the light turning element 90 has an incident surface and an exit surface, the incident surface and the exit surface intersect, and the propagation direction of the light is changed by the light turning element 90 to fold the optical path. The optical lens 100 penetrates along the optical axis direction and has a lens mounting hole, and at least one optical lens is arranged in the lens mounting hole along the optical axis direction, so as to realize the converging effect of the optical lens 100 on the light. After receiving the converging light, the photosensitive assembly 80 converts the received optical signal into an electrical signal for imaging processing.

[0161] In some embodiments, the number of optical lenses 100 can be two, wherein one of the two optical lenses 100 can be fixed, and the other optical lens 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. Of course, in this example, both of the two optical lenses 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. Further, the number of optical lenses 100 can be three, wherein two of the three optical lenses 100 can be fixed, and the other optical lens 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. Of course, in this example, one of the three optical lenses 100 can be fixed, and the other two optical lenses 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. In other specific examples of the present application, the number of optical lenses 100 can also be four, five, etc., and is not limited by the present application.

[0162] In some embodiments, the light sensing assembly 80 further comprises a chip circuit board, a light sensing chip, a filter element and a filter element holder. The light sensing chip is disposed on and connected to the chip circuit board. The filter element holder is located on the side of the light sensing chip and is disposed on the chip circuit board. The filter element holder and the chip circuit board are integrally formed or are in a split structure. The filter element is mounted on the filter element holder to maintain the light sensing path of the light sensing chip and filter the imaging light entering the light sensing chip.

[0163] The present application can also provide a camera module, as shown in Figure 1 , which comprises:

[0164] a driving device as above;

[0165] a light turning element 90 for turning the incident light,

[0166] an optical lens 100 held on the light turning path of the light turning element 90;

[0167] a light sensing assembly 80 for receiving the light from the optical lens 100.

[0168] The present application can also provide an assembly method of a camera module, as shown in Figures 11 to 14 , which comprises the steps of:

[0169] S1, providing a fixed part 10;

[0170] S2, providing a movable part 20, mounting the movable part 20 in the fixed part 10, the movable part 20 being used to carry the optical lens 100, the optical lens 100 defining an optical axis;

[0171] S3, providing a piezoelectric actuator 30, a pre-pressing piece 40 and a pressing block 50, assembling the piezoelectric actuator 30, the pre-pressing piece 40 and the pressing block 50 to form a pre-pressing driving assembly, wherein the pre-pressing piece 40 is disposed between the piezoelectric actuator 30 and the pressing block 50, the piezoelectric actuator 30 is mounted on the pre-pressing piece 40, the pressing block 50 is coupled with the pre-pressing piece 40 and provides a deformable pre-set space for the pre-pressing piece 40;

[0172] S4, mounting the pre-pressing driving assembly on the fixed part 10 in a direction perpendicular to the optical axis and making the driving assembly located on the top of the movable part 20, wherein the pressing block 50 is fixed on the fixed part 10, the pre-pressing piece 40 applies a pre-pressing force perpendicular to the optical axis direction (i.e. the second direction) to the piezoelectric actuator 30, the piezoelectric actuator 30 and the movable part 20 are in abutment under the action of the pre-pressing force, and the piezoelectric actuator 30 is in frictional contact with the movable part 20.

[0173] By arranging the piezoelectric actuator 30 on the top of the movable part 20, the support part structure can only be arranged on the bottom of the movable part 20 to provide support, without the need to additionally arrange the support part structure on the top or side of the movable part 20, thereby reducing the number of support part structures, and enhancing the assembly consistency and assembly precision. Further, since the assembly is performed from bottom to top, the assembly process is further simplified, and the assembly tolerance is reduced.

[0174] In some embodiments, the assembly method of the camera module further comprises the following step S1:

[0175] S11, providing a fixed part 10 and a first magnetic attraction member 71, the first magnetic attraction member 71 being arranged on the fixed part 10.

[0176] In some embodiments, the assembly method of the camera module further comprises the following step S2:

[0177] S21, providing a second magnetic attraction member 72, the second magnetic attraction member 72 being arranged on the movable part 20.

[0178] S22, providing a first support part 61 and a second support part 62, assembling the first support part 61 on the first guide rail 111, and assembling the second support part 62 on the second guide rail 131, the second magnetic attraction member 72 and the first magnetic attraction member 71 being arranged opposite to each other in the second direction and interacting to generate a magnetic attraction force, the magnetic attraction force clamping the first support part 61 and the second support part 62 between the movable part 20 and the fixed part 10.

[0179] In some embodiments, the assembly method of the camera module further comprises the following step S3:

[0180] S31, first fixing the pre-pressing member 40 and the piezoelectric actuator 30, and then coupling the pre-pressing member 40 to the pressing block 50 to form a pre-pressing driving assembly. In this way, the pre-pressing member 40 can be assembled with the pressing block 50 together with the piezoelectric actuator 30, thereby reducing the assembly difficulty.

[0181] Specifically, in step S31, the pre-pressing member 40 includes two fixed ends 41, an elastic part 42, and two bending parts 43, the two bending parts 43 being respectively arranged between the two fixed ends 41 and the elastic part 42 and connecting the elastic part 42 and the two fixed ends 41, the pre-pressing member 40 being fixed to the pressing block 50 through the two fixed ends 41, and the piezoelectric actuator 30 being mounted on the pre-pressing member 40 by being fixed to the elastic part 42.

[0182] It is worth mentioning that in other embodiments of the present application, the pre-pressing member 40 and the pressing block 50 can also be fixed first in step S3. Specifically, step S3 includes:

[0183] S31b, first coupling the pre-pressing part 40 to the pressing block 50, and then installing the piezoelectric actuator 30 to the pre-pressing part 40 to form a pre-pressing driving assembly.

[0184] Further, in some embodiments, the step S4 further comprises the step of:

[0185] S41, installing the pressing arm 52 of the pressing block 50 to the fixed part 10, and the friction head 32 of the piezoelectric actuator 30 is directed to abut against the first movable side wall 21 of the movable part 20, and the first movable side wall 21 is clamped between the friction head 32 of the piezoelectric actuator 30 and the first supporting part 61 by the pressing block 50, and the first supporting part 61 provides a supporting force along the second direction for the movable part 20;

[0186] S42, the pre-pressing part 40 is deformed under the action of the pressing block 50 and the first supporting part 61 to provide a pre-pressing force which is opposite to the supporting force and in the same direction as the downward pressing force.

[0187] Specifically, in the step S41, the pressing block 50 is installed in the first accommodating groove 112 of the fixed part 10.

[0188] Further, after assembling the piezoelectric actuator 30, the pre-pressing part 40 and the pressing block 50, the pressing block 50 is assembled to the fixed part 10 to complete the assembly process, which can simplify the entire assembly process and further reduce the problems of the inclination of the movable part 20 and the poor consistency of the assembly of the camera module caused by the assembly error.

[0189] It should be understood that the above assembly method can also be applied to Figures 15 to 24 Further, in the step S31, the pre-pressing part 40 further comprises an intermediate connecting part 44, and the intermediate connecting part 44 is fixed to the elastic part 42, so that the elastic part 42 is fixed to the piezoelectric actuator 30 through the intermediate connecting part 44.

[0190] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A driving device, characterized in that: include: A movable portion, configured to carry an optical lens, wherein the optical lens defines an optical axis, the movable portion comprising a first movable side wall and a second movable side wall opposite to each other, wherein the second movable side wall has a slot; a fixed portion, wherein the movable portion is movably disposed within the fixed portion; a piezoelectric actuator, in frictional contact with the top of the first movable side wall, for driving the movable portion to move along the optical axis; a pre-pressing member, disposed on top of the piezoelectric actuator and applying a pre-pressing force perpendicular to the optical axis to the first movable side wall; The damping structure includes a damping bracket and a damping member, wherein the damping bracket is arranged on the fixing portion, and the damping member extends from the plane where the damping bracket is located toward the second movable side wall, and at least a portion of the damping member extends into the slot of the second movable side wall.

2. The driving device according to claim 1, characterized in that The damping bracket includes a main body, a mounting portion and a side connecting portion, the mounting portion is located at both ends of the main body, the plane where the main body is located is parallel to the optical axis direction, the plane where the mounting portion is located is perpendicular to the optical axis direction, the side connecting portion is bent and extended from the plane where the main body is located along the second direction, the plane where the side connecting portion is located is perpendicular to the plane where the main body is located and the plane where the mounting portion is located, wherein the second direction is perpendicular to the optical axis direction.

3. The driving device according to claim 2, characterized in that The fixing portion includes a first fixed side wall and a second fixed side wall opposite to each other, the second fixed side wall has an opening, at least a portion of the second movable side wall is located in the opening, the mounting portion is fixed to the second fixed side wall, and the main body covers the opening.

4. The driving device according to claim 3, characterized in that The damping member includes a first part and a second part, the first part is connected to the main body of the damping bracket, the second part is connected to the first part, and the second part does not contact the main body of the damping bracket, wherein the length of the second part along the optical axis direction is smaller than the length of the first part along the optical axis direction.

5. The driving device according to claim 4, characterized in that The length of the second portion along the optical axis is smaller than the length of the slot along the optical axis.

6. The driving device according to claim 4, characterized in that A height of the second portion along the second direction is greater than a height of the first portion along the second direction.

7. The driving device according to claim 6, characterized in that A height of the second portion along the second direction is smaller than a height of the slot along the second direction.

8. The driving device according to claim 4, characterized in that Along the second direction, at least a portion of the main body abuts against the top of the second fixed side wall, and a certain gap is formed between at least a portion of the main body and the top of the second movable side wall.

9. The driving device according to claim 8, characterized in that The first portion includes a top surface and a bottom surface opposite to each other in a second direction, and a gap is formed between the bottom surface of the first portion and the top of the second movable sidewall.

10. The driving device according to claim 8, characterized in that The slot of the second movable sidewall has an inner sidewall parallel to the second direction, the second portion of the damping member has an inner surface parallel to the second direction, and a gap is formed between the inner sidewall and the inner surface.

11. The driving device according to claim 10, characterized in that: When the movable portion moves along the optical axis, the inner sidewall of the slot contacts the inner surface of the second portion, and the second portion moves or deforms toward the side where the inner sidewall is not in contact with the inner surface under the action of force.

12. A camera module, characterized in that: include: A drive device as claimed in any one of claims 1 to 11; Light deflection element for deflecting incident light. an optical lens, wherein the optical lens is held on a light deflection path of the light deflection element; The photosensitive component is used to receive light from the optical lens.

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