Driving device and camera module thereof

Abstract

The application discloses a driving device and a camera module thereof, and belongs to the field of camera modules. The driving device comprises a movable part, a fixed part, a position sensing assembly, a piezoelectric actuator and a conductive piece. The movable part comprises a first movable side wall. The fixed part comprises a first fixed side wall. The first movable side wall and the first fixed side wall are opposite to each other along a first direction. The position sensing assembly comprises a position sensing element and a position sensing magnet which are arranged opposite to each other along the first direction. The conductive piece is arranged on the top of the piezoelectric actuator and is electrically connected with the piezoelectric actuator. The conductive piece is bent from the top of the piezoelectric actuator to the first fixed side wall. The flexible circuit board is arranged on the first fixed side wall. At least part of the position sensing element and the conductive piece are respectively arranged on two sides of the flexible circuit board and are electrically connected with the flexible circuit board. The driving device and the camera module thereof have the advantages of convenient assembly, simplified wiring of the pre-pressing driving side and compressed assembly tolerance of the side.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of camera modules, in particular to a driving device and a camera module 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 user's requirements for the small size and high imaging capability of the camera module have become increasingly strict. In order to further improve the user experience, the industry is actively improving the compact design and functional integration of the camera module. Through technical innovation and functional integration, the industry is continuously promoting the development of the camera module towards more compact and intelligent, further realizing functions such as automatic focusing, zooming, anti-shake and telephoto.

[0003] The 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 the long-focus camera module caused by the excessive length of the long-focus lens optical total length. This design allows the camera to provide longer focal length and higher zoom capability without increasing the module thickness.

[0004] The existing periscopic camera module adopts a top-mounted piezoelectric motor, which can provide greater driving force while reducing the overall volume, meeting the driving needs of the long-focus section of the periscopic camera module. Since the piezoelectric motor is located on the top side of the movable carrier, the assembly precision of the driving surface of the movable carrier and the piezoelectric motor will directly affect the running effect of the movable carrier after being driven. SUMMARY

[0005] One purpose of the present application is to provide a driving device and a camera module thereof, which simplifies the conduction wiring by arranging the position sensing element and the conductive part on both sides of the flexible circuit board and electrically connecting the flexible circuit board, avoids the interference of the conductive part on the conduction of the position sensing assembly and the flexible circuit board, to solve or at least partially alleviate the problem of line conduction of the piezoelectric actuator and the position sensing element in the driving device.

[0006] Another purpose of the present application is to provide a driving device and a camera module thereof, which arranges the position sensing element in the first fixed side wall and electrically connects the flexible circuit board, and arranges at least part of the conductive part outside the flexible circuit board to electrically connect the conductive part of the flexible circuit board, effectively improving the compactness of the mounting structure on the first fixed side wall, avoiding increasing the assembly gap between the fixed part and the movable part, and being beneficial to improving the position sensing accuracy.

[0007] Another object of the present application is to provide a driving device and a camera module thereof, which reduces the difficulty of welding and the possibility of breakage by arranging the welding point of the conductive member and the flexible circuit board at the bottom.

[0008] Another object of the present application is to provide a driving device and a camera module thereof, which avoids mutual interference between the deformation of the conductive member and the deformation of the deformed part under the operation of the piezoelectric actuator, thereby affecting the driving effect of the driving device.

[0009] To achieve the above objects, the technical solution adopted by the present application is a driving device for a periscopic camera module, comprising:

[0010] a movable part for carrying an optical lens, the optical lens defining an optical axis, the movable part comprising a first movable side wall;

[0011] a fixed part, the movable part being movably arranged in the fixed part, the fixed part comprising a first fixed side wall, the first movable side wall being opposite to the first fixed side wall along a first direction, the first direction being perpendicular to the direction of the optical axis;

[0012] a position sensing assembly comprising a position sensing element and a position sensing magnet arranged opposite to each other along the first direction, the position sensing magnet being arranged on the first movable side wall;

[0013] a piezoelectric actuator in frictional contact with the top of the first movable side wall, for driving the movable part to move along the direction of the optical axis;

[0014] a conductive member arranged on the top of the piezoelectric actuator and electrically connected with the piezoelectric actuator, the conductive member being bent from the top of the piezoelectric actuator to the first fixed side wall;

[0015] a flexible circuit board arranged on the first fixed side wall, at least a part of the position sensing element and the conductive member being respectively located on both sides of the flexible circuit board and electrically connected with the flexible circuit board.

[0016] As a preferred, the flexible circuit board comprises an inner side and an outer side opposite to each other along the first direction, the first fixed side wall has a mounting groove, the position sensing element is arranged in the mounting groove to electrically connect the inner side of the flexible circuit board, and the conductive member is bent to the outer side of the flexible circuit board to electrically connect the flexible circuit board.

[0017] As a preferred, the flexible circuit board includes a top close to the piezoelectric actuator and a bottom away from the piezoelectric actuator, the conductive piece is bent from the top of the piezoelectric actuator and extends to the bottom of the flexible circuit board to conduct electricity at the bottom of the flexible circuit board.

[0018] As a preferred, the conductive piece includes a main body part, an extension part and a welding part, the main body part is located at the top of the piezoelectric actuator, the extension part is bent from the plane where the main body part is located along the second direction, and the welding part is connected with the extension part and electrically connected with the bottom of the flexible circuit board, the plane where the main body part is located is perpendicular to the plane where the flexible circuit board is located, and the plane where the extension part is located is parallel to the plane where the flexible circuit board is located; wherein the second direction is perpendicular to the optical axis direction and the first direction.

[0019] As a preferred, the piezoelectric actuator includes a piezoelectric active part and a friction head connected with each other, the friction head is in frictional contact with the top of the first movable side wall; the main body part is located at the top of the piezoelectric active part, and the extension part extends from both ends of the main body part along the optical axis direction and is bent along the second direction.

[0020] As a preferred, the extension part includes an extension area and an extension leg, the extension area extends from both ends of the main body part along the optical axis direction and is bent along the second direction to connect the extension leg, the bottom of the extension leg along the second direction is connected with the welding part, and the main body part, the extension area, the extension leg and the welding part form an opening.

[0021] As a preferred, a pre-pressing piece is further included, the pre-pressing piece is arranged at the top of the piezoelectric actuator and applies a pre-pressing force perpendicular to the optical axis direction to the movable part; the pre-pressing piece includes a pre-pressing piece main body and a pre-pressing piece deformation body, the pre-pressing piece deformation body extends from both ends of the pre-pressing piece main body along the optical axis direction; along the second direction, the distance from the top surface of the main body part of the conductive piece to the bottom surface of the pre-pressing piece main body is H1, and the distance from the top surface of the extension part of the conductive piece to the bottom surface of the pre-pressing piece deformation body is H2, H1≤H2.

[0022] As a preferred, the extension part has a height difference with the plane where the main body part is located, and the extension part and the main body part are connected through an inclined connecting part.

[0023] As a preferred, a mounting part is arranged between the pre-pressing piece main body and the main body part of the conductive piece to increase the distance H1 from the top surface of the main body part to the bottom surface of the pre-pressing piece main body.

[0024] To achieve one of the purposes of the present application, the technical scheme adopted by the present application is a camera module, which includes:

[0025] any one of the above driving devices;

[0026] a light turning element for turning the incident light rays,

[0027] an optical lens held on the light turning path of the light turning element;

[0028] a photosensitive assembly electrically connected to the flexible circuit board for receiving the light rays from the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only relate to some embodiments of the present application and are not a limitation on the present application.

[0030] Figure 1 It is a structural schematic diagram of the camera module in some embodiments of the present application.

[0031] Figure 2 It is an exploded structural schematic diagram of the camera module in some embodiments of the present application.

[0032] Figure 3 It is an exploded structural schematic diagram of the driving device in some embodiments of the present application.

[0033] Figure 4 It is an exploded structural schematic diagram of the camera module in some other embodiments of the present application.

[0034] Figure 5 It is a sectional structural schematic diagram of the driving device in some embodiments of the present application in the optical axis direction and the second direction.

[0035] Figure 6 It is a sectional structural schematic diagram of the driving device in some other embodiments of the present application in the optical axis direction and the second direction.

[0036] Figure 7 It is a sectional structural schematic diagram of the camera module in some embodiments of the present application in the first direction and the second direction.

[0037] Figure 8 It is a bottom view schematic diagram of the camera module structure in some embodiments of the present application.

[0038] Figure 9 It is a bottom view schematic diagram of the camera module structure in some other embodiments of the present application.

[0039] Figure 10 It is a bottom view schematic diagram of the camera module structure in some other embodiments of the present application.

[0040] Figure 11Schematic diagram of the explosion structure of the driving device in other embodiments of the present application.

[0041] Figure 12 for Figure 11 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.

[0042] Figure 13 for Figure 11 Schematic diagram of the assembly process of the movable part of the driving device in the embodiment shown.

[0043] Figure 14 for Figure 11 Schematic diagram of the assembly process of the piezoelectric actuator and pre-stressed member of the driving device in the embodiment shown.

[0044] Figure 15 for Figure 11 Schematic diagram of the assembly process of the pressing block and pre-pressing member of the driving device in the embodiment shown.

[0045] Figure 16 Schematic diagram of the cross-sectional structure of the driving device in the optical axis direction in a modified embodiment of the present application.

[0046] Figure 17 Schematic diagram of the structure of the driving device in a modified embodiment of the present application without a fixed part.

[0047] Figure 18 This is a structural diagram of a pressure block, a pre-pressing member, and a piezoelectric actuator of a driving device in a modified embodiment of the present application.

[0048] Figure 19 This is a structural schematic diagram of the pressure block, pre-pressing member and piezoelectric actuator of the driving device from another perspective in a modified embodiment of the present application.

[0049] Figure 20 A schematic diagram of the cross-sectional structure of a camera module in a first direction in a modified embodiment of the present application.

[0050] Figure 21 This is a structural side view of a pressing block, a pre-pressed member, and a piezoelectric actuator in a modified embodiment of the present application.

[0051] Figure 22 for Figure 21 Enlarged view of point A.

[0052] Figure 23 In another embodiment Figure 21 Enlarged view of point A.

[0053] In the picture:

[0054] 10, fixed part; 11, first fixed side wall; 111, first guide groove; 112, first accommodating groove; 113, second accommodating groove; 114, base extension; 1141, second mounting plane; 115, mounting groove; 12, fixed main body; 13, second fixed side wall; 131, first support groove; 14, conductive part; 141, conductive part; 15, flexible circuit board; 20, movable part; 21, first movable side wall; 211, second guide groove; 22, friction part; 221, friction plate; 23, second movable side wall; 231, second support groove; 30, piezoelectric actuator; 31, piezoelectric active part; 32, friction head; 33, conductive part; 34, buffer part; 331, first connecting part; 333, second connecting part; 334, conductive part; 3301, main body part; 3302, extension part; 33021, extension area; 33022, extension leg; 3303, welding part; 3300, opening; 40, pre-pressing part; 41, fixed end; 411, fixed hole; 42, elastic part; 43, bending part; 44, mounting part; 50, pressing block; 51, downward pressing beam; 52, downward pressing arm; 521, downward pressing fixed platform; 522, downward pressing mounting platform; 523, first mounting plane; 524, mounting column; 500, groove; 61, first support part; 62, second support part; 601, support ball; 602, small ball; 70, magnetic attraction assembly; 71, first magnetic attraction part; 711, base part; 712, support part; 72, second magnetic attraction part; 80, light sensing assembly; 90, light turning element; 100, optical lens; 110, position sensing assembly; 1101, position sensing element; 1102, position sensing magnet. DETAILED DESCRIPTION

[0055] In order to make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings which show the embodiments according to the present application. It should be understood that the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments described in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort, shall fall within the scope of protection of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise", "comprises", "comprising", "containing", "contain", "contains", "include", "includes", "including", "have", "has", "having" or the like are to be understood exclusively as referring to the presence of those various introduced elements. Thus, a method or device that "comprises" or "has", among other steps or elements, one or more steps or elements does not, without more, preclude the presence of other steps or elements than those listed; the use herein of terms such as "first", "second" and the like is to be understood as referring to different categories of objects unless otherwise indicated. In addition, the terms "first", "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or an implicit indication of the number of the indicated technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of such features. In the description of the application, the meaning of "a plurality" is two or more, unless otherwise stated.

[0057] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "transverse", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0058] In the description of the application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "attaching" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0059] In the present application, the reference to "embodiments" means that the specific features, structures or properties described in connection with the embodiments can be included in at least one embodiment of the application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the application can be combined with other embodiments.

[0060] As described above, it should be emphasized that when the term "comprising" is used in the present specification, it is used in the sense of "including" but also in the sense of "consisting only of" and in the sense of "consisting of", so as to cover the case where the recited feature, integer, step or component is present and also the case where the recited feature, integer, step or component is not present. As used in this application, the singular forms "a", "an" and "the" include plural references unless the context clearly dictates otherwise.

[0061] The word "a" or "an" when used in the context of this specification shall not be construed to mean "one and only one". On the contrary, it is well understood that a plurality of elements as referenced by "a" or "an" can exist. When such a plurality is implied, the application to be understood as including at least two of those elements. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusive "or". That is, unless specified otherwise, or clear from context, "X employs A or B" is intended to mean any of the natural inclusive permutations. That is, if X employs A; X employs B; or X employs both A and B, then "X employs A or B" is satisfied. In addition, the articles "a", "an", and "the" as used in this application and the appended claims should generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.

[0062] The term "and / or" as used in the application refers to the association of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the application generally means that the front and rear associated objects are in an "or" relationship.

[0063] According to Figures 1 to 23 As shown in the figure, one or more embodiments of the present application disclose a driving device, comprising: a movable part 20 for carrying an optical lens 100, the optical lens 100 defining an optical axis, the movable part 20 comprising a first movable side wall 21; a fixed part 10, the movable part 20 being movably arranged in the fixed part 10, the fixed part 10 comprising a first fixed side wall 11, the first movable side wall 21 being opposite to the first fixed side wall 11 along a first direction, the first direction being perpendicular to the direction of the optical axis; a position sensing assembly 110 comprising a position sensing element 1101 and a position sensing magnet 1102 arranged opposite along the first direction, the position sensing magnet 1102 being arranged on the first movable side wall 21; a piezoelectric actuator 30 in frictional contact with the top of the first movable side wall 21 for driving the movable part 20 to move along the direction of the optical axis; a conductive piece 33 arranged on the top of the piezoelectric actuator 30 and electrically connected with the piezoelectric actuator 30, the conductive piece 33 being bent from the top of the piezoelectric actuator 30 to the first fixed side wall 11; a flexible printed circuit board 15 arranged on the first fixed side wall 11, the position sensing element 1101 and at least a part of the conductive piece 33 being respectively located on two sides of the flexible printed circuit board 15 and electrically connected with the flexible printed circuit board 15.

[0064] The present application sets the bending conductive piece 33 and the flexible circuit board 15, the position sensing element 1101 and the conductive piece 33 are respectively located on both sides of the flexible circuit board 15 and are electrically connected with the flexible circuit board 15, realizing the conduction of the position sensing assembly 110 on the first fixed side wall 11 and the conductive piece 33, wherein the position sensing element 1101 and the conductive piece 33 are located outside the first movable side wall 21, the position sensing element 1101 is located inside the first fixed side wall 11, so that the position sensing magnet 1102 is closer to the driving source, ensuring the accuracy of measurement and signal transmission speed, the conductive piece 33 is located outside the flexible circuit board 15, avoiding the structural interference between the conductive piece 33 located inside and the position sensing element 1101, and preventing the conductive piece 33 located inside from being excessively bent to cause the risk of fracture. Through this conduction mode, the conductive piece 33 and the position sensing element 1101 can be concentrated and conducted on the flexible circuit board 15, and then conducted with other external elements through the flexible circuit board 15, which simplifies the conduction circuit and facilitates the welding of the conductive piece 33 and the flexible circuit board 15. Further, the structure of the driving device can be more compact.

[0065] As shown in Figure 1 The optical lens 100 defines an optical axis perpendicular to the first direction and the second direction. Specifically, the first direction defines the width direction of the periscopic camera module arranged along the Y axis, the second direction defines the height direction of the periscopic camera module arranged along the Z axis, and the optical axis direction defines the length direction of the periscopic camera module arranged along the X axis. It can be understood that the coordinate system can be flexibly set according to actual needs, which is not limited here.

[0066] In the pre-press driving structure of the embodiment of the application, the pre-press driving structure of the driving device comprises a piezoelectric actuator 30, a pre-press member 40 and a pressing block 50. The piezoelectric actuator 30 is arranged on the upper part of at least a part of the movable part 20 along the second direction. The pre-press member 40 is arranged on the top of the piezoelectric actuator 30 and exerts a pre-press force on the movable part 20 perpendicular to the optical axis direction. At least a part of the pre-press 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-press member 40 to generate a pre-press force along the second direction. The piezoelectric actuator 30 and the movable part 20 abut under the action of the pre-press force. The pre-press member 40 and the pressing block 50 are arranged above the movable part 20 in the height direction (second direction Z-axis). The pressing block 50 is coupled with the pre-press 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-press member 40 to adjust the size of the pre-press force, thereby improving the performance of the driving device. Further, the pressing block 50 can also protect the pre-press member 40 from interference with other components in the driving device during deformation, thereby affecting the performance of the pre-press member 40.

[0067] wherein the reference Figure 2 , Figure 3 and Figure 11 It can be seen that, in some embodiments of the piezoelectric actuator 30 of the application, the piezoelectric actuator 30 comprises a piezoelectric active part 31 and a friction head 32 connected to each other. Due to the pre-press force exerted by the pre-press member 40 on the piezoelectric actuator 30 along the second direction towards the movable part 20, the movable part 20 and the friction head 32 in the piezoelectric actuator 30 always maintain frictional contact, which helps to drive the movable part 20 to move along the optical axis direction after the piezoelectric active part 31 receives voltage, reduces the shaking of the optical lens 100 during driving and the resulting inclination, and further improves the imaging accuracy and stability of the camera module during autofocus. Specifically, the friction head 32 is in frictional contact with the top of the first movable side wall 21.

[0068] 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.

[0069] Among them, an imaginary line of the action direction of the pre-pressure in the second direction passes through the pressure block 50, the pre-pressing member 40, the friction head 32 and the first support part 61, ensuring that the action area of ​​the movable part 20 subjected to the pre-pressure and supported by the first support part 61 is concentrated as much as possible in the same direction on the first movable side wall, so as to reduce the tipping moment and maintain the movement stability of the movable part 20.

[0070] Furthermore, the cross-sectional center of the pressure block 50, the position where the friction head 32 acts on the movable part 20 and the cross-sectional center of the first support part 61 are aligned in the second direction, thereby improving the targeted effect of the supporting force and reducing the overturning moment more accurately.

[0071] In some embodiments, a portion of the movable portion 20 that contacts the friction head 32 is disposed on the same side as the pressing block 50 . Figure 7 As shown, a side of the movable portion 20 adjacent to the piezoelectric actuator 30 extends along the width direction (first direction Y-axis) toward an inner sidewall of the fixed portion 10 on which the piezoelectric actuator 30 is mounted, so as to be disposed on the same side as the pressure block 50. A portion of the movable portion 20 abutting the friction head 32, the friction head 32, the piezoelectric active portion 31, and the pressure block 50 are sequentially distributed along the second direction within a sidewall of the fixed portion 10 to enhance the compactness of the structural distribution on this side and, to a certain extent, ensure that the preload applied downward along the second direction is perpendicular to the friction surface (XY interface) of the movable portion 20 with the friction head 32, thereby maximizing the actuating effect of the preload and improving driving efficiency.

[0072] refer to Figure 5 and Figure 6 It can be seen that in some embodiments, the fixed portion 10 is provided with a first accommodating groove 112 and a second accommodating groove 113, and the first accommodating groove 112 and the second accommodating groove 113 are opened on the same side of the fixed body 12 along the second direction, and the first accommodating groove 112 can be communicatively located at the upper part of the second accommodating groove 113, and 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 along the optical axis direction is larger than the size of the second accommodating groove 113 along the optical axis direction.

[0073] Specifically, since the length of the first accommodating groove 112 along the optical axis is greater than the length of the second accommodating groove 113 along the optical axis, the pressing block 50 accommodated in the first accommodating groove 112 can be fixed to the fixing portion 10, further increasing the stability and reliability of the pressing block 50.

[0074] Further, the pressing block 50 is arranged in the first accommodating groove 112, the movable part 20 is arranged in the second accommodating groove 113, and the pre-pressing member 40 and the piezoelectric actuator 30 are arranged between the pressing block 50 and the movable part 20 in sequence, so that the structure is more compact, and the space utilization inside the camera module is increased.

[0075] 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 space for at least a part of the movable part 20 to move along the optical axis direction when driven by the piezoelectric actuator 30 in the second accommodating groove 113.

[0076] In an embodiment of the application for supporting the movable part 20, the driving device further comprises a first supporting part 61 and a second supporting part 62 between the fixed part 10 and the movable part 20, both of which are parallel to the optical axis direction (third direction X-axis) in the length direction and are located on opposite sides of the bottom of the fixed part 10 and the movable part 20 along the width direction (first direction Y-axis) respectively, the first supporting part 61 is arranged on the same side of the piezoelectric actuator 30, and the second supporting part 62 is arranged on the opposite side of the piezoelectric actuator 30, so that the movable part 20 can stably move in the fixed part 10, and the stability of the driving device is improved.

[0077] The first support part 61 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 part 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 part 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, and the pressing block 50, the pre-pressing part 40 and the piezoelectric actuator 30 are sequentially arranged on the top of the first movable side wall 21 of the movable part 20 along the second direction, wherein the first support part 61 provides an upward supporting force along the second direction for the first movable side wall 21, and the pre-pressing part 40 deforms under the joint action of the first support part 61 and the pressing block 50 to generate a pre-pressing force. It can be understood that if the pressing block 50 and the fixed part 10 are not fixed, the pre-pressing part 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 part 40 and the piezoelectric actuator 30 to be separated from the movable part 20, thereby preventing the pre-pressing part 40 from deforming and generating 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 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 prevent the pre-pressing part 40 and the pressing block 50 from being separated; on the other hand, it can keep the deformation of the pre-pressing part 40, thereby ensuring the generation of the pre-pressing force. The direction of the pre-pressing force is the same as the direction of the downward pressing force, the direction of the downward 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 side of the movable part 20 on one side, 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 balance the pre-pressing force, thereby reducing the risk of overturning of the movable part 20.

[0078] Specifically, the fixed part 10 and the movable part 20 are provided with guide grooves and support grooves for accommodating the first support part 61 and the second support part 62, respectively. More specifically, the guide grooves include a first guide groove 111 located at the first fixed side wall 11 and a second guide groove 211 located at the first movable side wall 21, and the first support part 61 is arranged between the two. The support grooves include a first support groove 131 located at the second fixed side wall 13 and a second support groove 231 located at the second movable side wall 23, and the second support part 62 is arranged between the two.

[0079] In some embodiments, the pre-pressing member 40 is deformed to generate a pre-pressing force under the action of the pressing block 50 and the first support part 61, and the direction of the pre-pressing force is the same as that of the downward pressing force. Due to the pre-pressing force, the friction head 32 and the movable part 20 are always in frictional contact, which is conducive to the piezoelectric actuator 30 generating stable driving force.

[0080] The size of the pressing block 50 along the optical axis is greater than that of the first support part 61 along the optical axis, and in the optical axis direction, the projection of the first support part 61 along the second direction is entirely within the projection range of the pressing block 50 along the second direction, so that the multiple support parts in the first support part 61 can bear more uniform force. The second direction is perpendicular to the optical axis direction. Further, the size of the pressing block 50 along the optical axis is also greater than that of the second guide groove 211 along the optical axis, and in the optical axis direction, the projection of the second guide groove 211 along the second direction is entirely within the projection range of the pressing block 50 along the second direction, so that even if the position of the first support part 61 in the second guide groove 211 changes, the projection of the first support part 61 along the second direction in the optical axis direction can still be entirely within the projection range of the pressing block 50 along the second direction. As described above, the pressing block 50 can provide a deformation space for the pre-pressing member 40, maintain the deformation of the pre-pressing member 40, and also adjust the size of the pre-pressing force generated by the pre-pressing member 40. Since the first support part 61, the pressing block 50 and the pre-pressing member 40 are located on the same side relative to the optical axis, the pre-pressing force can act more directly on the first support part 61, and the adjustment of the pressing block 50 to the pre-pressing force can also act directly on the first support part 61. By projecting the first support part 61 along the second direction entirely within the projection range of the pressing block 50 along the second direction, on the one hand, the pressing block 50 maintains the close fit of the pre-pressing member 40 and the first support part 61 in the spatial position to generate pre-pressing force and support force; on the other hand, the first support part 61 is always within the range of the pressing block 50 during driving, reducing the risk of overturning of the movable part 20 and improving the stability of the driving device; on the other hand, the pre-pressing force adjusted by the pressing block 50 can be dispersed by the multiple support parts of the first support part 61, so that the force borne by each support part is more uniform, and especially when falling or impact occurs, the multiple support parts can disperse the impact force to reduce the risk of dents on the first support part 61, further, the pressing block 50 can also protect the first support part 61 in its original position, avoiding the first support part 61 from being separated, affecting the reliability of the driving device.

[0081] For the convenience of describing the position of the piezoelectric actuator 30 and the support part on the driving device, the two side walls of the first movable side wall 21 and the second movable side wall 23 of the fixed part 10 relative to the movable part 20 are defined as the first fixed side wall 11 and the second fixed side wall 13. The pressing block 50, the pre-pressing piece 40 and the piezoelectric actuator 30 are arranged in sequence along the second direction on the top of the first fixed side wall 11 of the fixed part 10, and the friction head 32 of the piezoelectric actuator 30 acts on the top of the first movable side wall 21 of the movable part 20. Wherein the friction head 32 of the piezoelectric actuator 30 is in frictional contact with the top of the first movable side wall 21, the pre-pressing piece 40 is arranged on the top of the piezoelectric driving part 31 of the piezoelectric actuator 30, and the pressing block 50 is located on the top of the pre-pressing piece 40. The first support part 61 is arranged between the bottom of the first movable side wall 21 and the first fixed side wall 11, and the second support part 62 is located between the bottom of the second movable side wall 23 and the first fixed side wall 11.

[0082] Since the pre-pressing piece 40 is only arranged on the first movable side wall 21 of the movable part 20, the support force provided by the second support part 62 to the bottom of the second movable side wall 23 of the movable part 20 further balances the pre-pressing force generated on the first movable side wall 21 of the movable part 20. On the one hand, it avoids the friction force generated by the surface contact between the movable part 20 and the fixed part 10 being too large, resulting in poor driving effect. On the other hand, the arrangement of the second support part 62 is beneficial to improve the parallelism when the movable part 20 moves, further improve the stability of the optical lens 100, and enhance the imaging quality of the camera module.

[0083] It can be understood that the first support part 61 is 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 that there is a gap between the fixed part 10 and / or the movable part 20 on one side of the second support part 62, which provides a certain pre-positioning 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 the position adjustment of the movable part 20. And when the movable part 20 is inclined to a certain extent, the abutment between the fixed part 10 and the movable part 20 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, and the tight fit facilitates the installation and positioning of the movable part 20, while 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 produce a rotating movement trend, inclination of the movable part 20 around the first direction to produce a rotating movement trend, and inclination of the movable part 20 around the second direction to produce a rotating movement trend.

[0084] In some embodiments, the first support part 61 and the second support part 62 can also be tightly fitted and abut between the fixed part 10 and the movable part 20, so that the first support part 61 and the second support part 62 always provide stable support to the movable part 20 to ensure the parallelism of the movable part 20 during movement, thereby reducing the risk of inclination of the movable part 20.

[0085] Further, when the movable part 20 is driven to move along the optical axis direction, the main supporting part is the first supporting part 61, the straight line distance from the contact point between the friction head 32 and the movable part 20 to the first supporting part 61 is less than the straight line distance from the contact point between the friction head 32 and the movable part 20 to the second supporting part 62. Since the first supporting part 61 is assembled in a tight fit manner, the straight line distance from the contact point between the friction head 32 and the movable part 20 to the first supporting part 61 is the force arm value corresponding to the overturning moment of the movable part 20. By reducing the force arm value, the overturning moment value is further reduced, thereby avoiding the risk of the movable part 20 tilting. Further, the tight fit and loose fit assembly manners described above can be considered by the tolerance value in the assembly process. For example, the tolerance between the first supporting part 61 and the movable part 20, the fixed part 10 is small, for example, 0.01, while the tolerance between the second supporting 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 tilt, the first supporting part 61 provides support to the movable part 20, and when the movable part 20 tilts, the second supporting part 62 provides support to the movable part 20 to right the movable part 20. This can to some extent reduce the possibility of the movable part 20 tilting, which helps to improve the imaging quality of the camera module.

[0086] Reference Figure 2 , Figure 7 and Figure 11 As shown in FIGS. 1 to 6, the movable part 20 includes opposite first movable side wall 21 and second movable side wall 23, the first movable side wall 21 and the second movable side wall 23 are oppositely arranged along a first direction, the first movable side wall 21 is provided with a friction part 22, the second guide groove 211 is opened on the bottom surface of the first movable side wall 21 and is oppositely arranged with the first guide groove 111 on the fixed part 10 along a second direction, the first supporting part 61 is installed between the first guide groove 111 and the second guide groove 211, so that the bottom surface of the first movable side wall 21 abuts against the first supporting 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 accommodating groove 113. The second supporting groove 231 is opened on the bottom surface of the second movable side wall 23 and is oppositely arranged with the first supporting groove 131 along the second direction, and the second supporting part 62 is installed between the first supporting groove 131 and the second supporting groove 231, so that the bottom surface of the second movable side wall 23 abuts against the second supporting part 62. The present application stably clamps the supporting part between the movable part 20 and the fixed part 10 by assembling the supporting part in the guide groove and the supporting groove, thereby increasing the stability of the camera module.

[0087] The fixed part 10 further comprises a first fixed side wall 11 and a second fixed side wall 13 oppositely arranged on two sides of a fixed main body 12 along a second direction, and a first accommodating groove 112 and a second accommodating groove 113 are arranged in the first fixed side wall 11 along the second direction, so that the pressing block 50 abuts against the top side of the first fixed side wall 11, and a first guide groove 111 and a first supporting groove 131 are arranged in the first fixed side wall 11 and the second fixed side wall 13, respectively. The first supporting part 61 is arranged in the first guide groove 111 and supports the first movable side wall 21 of the movable part 20, and the second supporting part 62 is arranged in the first supporting groove 131 and supports the second movable side wall 23 of the movable part 20. The arrangement of the first supporting part 61 and the second supporting part 62 reduces the frictional resistance when the movable part 20 is driven to move, and improves the driving performance in the camera module. The first guide groove 111 and the first supporting groove 131 are arranged on the two sides of the fixed part 10 along the first direction, so that the first supporting part 61 and the second supporting part 62 are arranged in alignment along the first direction, thereby providing stable support for the movable part 20. Further, as shown in FIGS. 12 and 13, since the piezoelectric actuator 30 drives the movable part 20 on the top side of the movable part 20, the first supporting part 61 and the second supporting part 62 arranged in alignment on the bottom side of the movable part 20 can provide stable support for the movable part 20, and further improve the stability of the movable part 20 when driven along the optical axis. In other words, when the piezoelectric actuator 30 drives the movable part 20, the supporting parts arranged on the bottom side of the movable part 20 and on the opposite side of the piezoelectric actuator 30 can clamp the movable part 20 between the piezoelectric actuator 30 and the supporting parts, thereby avoiding the inclination of the movable part 20 caused by the piezoelectric actuator 30 during driving. Further, the supporting parts do not need to be arranged on the side or top side of the movable part 20, thereby reducing the number of supporting parts in the camera module, optimizing the assembly process, further reducing the assembly tolerance and increasing the assembly consistency. Figure 4 、 Figures 16 to 19 Further, as shown in FIGS. 12 and 13, since the piezoelectric actuator 30 drives the movable part 20 on the top side of the movable part 20, the first supporting part 61 and the second supporting part 62 arranged in alignment on the bottom side of the movable part 20 can provide stable support for the movable part 20, and further improve the stability of the movable part 20 when driven along the optical axis. In other words, when the piezoelectric actuator 30 drives the movable part 20, the supporting parts arranged on the bottom side of the movable part 20 and on the opposite side of the piezoelectric actuator 30 can clamp the movable part 20 between the piezoelectric actuator 30 and the supporting parts, thereby avoiding the inclination of the movable part 20 caused by the piezoelectric actuator 30 during driving. Further, the supporting parts do not need to be arranged on the side or top side of the movable part 20, thereby reducing the number of supporting parts in the camera module, optimizing the assembly process, further reducing the assembly tolerance and increasing the assembly consistency.

[0088] Specifically, since the movable part 20 moves along the optical axis, the first supporting part 61 and the second supporting part 62 are arranged between the movable part 20 and the fixed part 10 to support the weight of the movable part 20. To further maintain the stability of the optical lens 100, the first supporting part 61 and the second supporting part 62 are arranged on the two sides of the bottom side of the movable part 20 along the first direction relative to the optical axis, to provide as symmetrical support force as possible for the movable part 20, thereby reducing the risk of inclination of the movable part 20.

[0089] 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 top side of the first movable side wall 21 is provided with the piezoelectric actuator 30 and the pre-pressing piece 40, which on the one hand makes the internal space of the camera module more reasonable, because 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 on the bottom surface of the first movable side wall 21, and there is also 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 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 helps to ensure that the support part always effectively supports the movable part 20 in the long stroke.

[0090] As shown in Figure 8 some embodiments, the first support part 61 and the second support part 62 are respectively at least two support parts arranged in the optical axis direction with a spacing, and the spacing of the at least two support parts of the first support part 61 is greater than the spacing of the at least two support parts of the second support part 62. It can be understood that the first support part 61 is fitted inside the second guide groove 211, and the second support part 62 is fitted inside the second support groove 231. As above, 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 to provide sufficient movement space for the first support part 61 and the second support part 62. The support part can be implemented as a ball or a sliding block.

[0091] In some embodiments, the movable portion 20 and / or the fixed portion 10 are provided with a guide structure suitable for mounting the support portion, such as a guide groove or guide rail structure. Since the support portion is arranged along the optical axis, it is convenient to guide the movable portion 20 to move along the optical axis. It is understood that the inner side of the guide groove or guide rail is provided with a metal insert to help reduce wear of the support portion when it moves within the guide groove or guide rail, reduce the risk of the support portion getting stuck during use, and further improve the quality and life of the camera module.

[0092] In some embodiments, the first support portion 61 can be implemented as a plurality of support portions arranged in sequence along the optical axis. It should be understood that, on the one hand, increasing the number of support portions can improve the stability and load-bearing capacity of the movable portion 20, making the movable portion 20 more stable when moving along the optical axis; on the other hand, since the motion state of a single support portion is uncertain, the support portion may be in a rolling state or a sliding state, and increasing the number of support portions can compensate for the motion states between the support portions. Furthermore, the second support portion 62 can be implemented as a plurality of support portions arranged in sequence along the optical axis, so that the opposite sides of the movable portion 20 are supported in a balanced manner. Specifically, the number of support portions included in the first support portion 61 is greater than or equal to 3, and the number of support portions included in the second support portion 62 is greater than or equal to 3.

[0093] like Figure 8 As shown, in some embodiments, two second guide grooves 211 are opened on the bottom surface of the first movable side wall 21 at intervals along the optical axis direction, and two second support grooves 231 are opened on the bottom surface of the second movable side wall 23 at intervals along the optical axis direction, and the distance between the farthest end points of the two second guide grooves 211 is greater than the distance between the farthest end points of the two second support grooves 231.

[0094] Due to the preload, the friction head 32 drives the friction portion 22 on the first movable sidewall 21. This increases the length of the first movable sidewall 21 of the movable portion 20 along the optical axis, thereby increasing the length of the friction portion 22 along the optical axis. Furthermore, the piezoelectric actuator 30 and the first support portion 61 are both located on the first movable sidewall 21. Because both the piezoelectric actuator 30 and the preload member 40 extend along the optical axis, the corresponding first movable sidewall 21 also needs to extend along the optical axis. In other words, the first movable sidewall 21 has a certain length along the optical axis, leaving more space on the bottom side of the first movable sidewall 21 for the first support portion 61. To further improve the balance of the structure, the distance between the first support portions 61 can be appropriately increased. Specifically, the second guide groove 211 and the second support groove 231 can be circular, rectangular, hemispherical, U-shaped, V-shaped, pyramidal, or other shapes.

[0095] In some embodiments, two second guide grooves 211 are formed on the bottom surface of the first movable side wall 21 in the optical axis direction, and the first support part 61 is installed in the second guide groove 211 and the first guide groove 111. Two second support grooves 231 are formed on the bottom surface of the second movable side wall 23 in the optical axis direction, and the second support part 62 is installed in the second support groove 231 and the first support groove 131. This helps to improve the installation stability of the support part and optimize the assembly process.

[0096] Further, since the support part structure is assembled in the guide groove, as the distance between the two second guide grooves 211 increases, the distance between the two support parts of the first support part 61 assembled in the two second guide grooves 211 also increases, thereby increasing the support area formed by the connection line of the first support part 61 and the second support part 62, thereby reducing the risk of tilting of the movable part 20 during movement.

[0097] In some embodiments, as shown in FIG. 2B, in the second direction, the projection of the friction part 22 and the projection of the farthest end point of the two second guide grooves 211 overlap 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 each other. This helps to reduce the risk of tilting of the movable part 20 in the left-right direction and the front-back direction. Therefore, by increasing the distance between the two support parts of the first support part 61, a larger support area is provided for the movable part 20, and stable support force is provided during the entire movement of the movable part 20, thereby reducing the possibility of tilting of the movable part 20 in the front-back direction. In other words, the length of the friction part 22 in the optical axis direction is less than the distance between the farthest end points of the two second guide grooves 211 in the optical axis direction. Figure 6 In some embodiments, the first support part 61 and the second support part 62 each include two balls for providing smooth support force to the movable part 20. Further, each ball is arranged in a pair of guide grooves, thereby avoiding interference between the two balls. It can be understood that the greater the distance between the two balls of the first support part 61 and the second support part 62 arranged in the optical axis direction, the smoother the support force provided to the movable part 20, thereby further enhancing the stability and reliability of the optical lens 100. When the distance between the two balls of the first support part 61 is greater than the distance between the two balls of the second support part 62, the support area formed by the support parts is increased, thereby increasing the stability of the optical lens 100.

[0098]

[0099] ​In some embodiments, the projection of the connection line between the friction head 32 of the piezoelectric actuator 30 and the first support part 61 in the second direction overlaps with the projection of the friction head 32 of the piezoelectric actuator 30 in the second direction, further reducing the overturning moment value, reducing the risk of the movable part 20 being tilted.

[0100] In some embodiments, 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 of the piezoelectric driving 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, further making 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 due to uneven pre-pressing force. Further, when the piezoelectric driving part 31 causes the friction head 32 to move by generating vibration deformation, the angle between the friction head 32 and the movable part 20 changes with the movement, which causes the force generated between the friction head 32 and the movable part 20 to not always be 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 movable side wall 21 of the movable part 20 lies. At this time, the inclination of the force may further cause the movable part 20 to tilt. 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 for the movable part 20, thereby reducing the overturning moment value and further reducing the risk of the movable part 20 being tilted.

[0101] In some embodiments, the imaginary line of the direction of the pre-pressing force acting on the movable part 20 intersects the connection line between the first support part 61, which is conducive to reducing the overturning moment value and further reducing the risk of the movable part 20 being tilted.

[0102] In some embodiments, 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 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 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 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 tilted.

[0103] In some embodiments, with reference to Figures 8 to 10The first support part 61 and the second support part 62 are independent components that can be formed independently of the movable part 20 and the pressing block 50. Further, the first support part 61 can be a multi-point structure, such as a ball or a sliding block, arranged along the optical axis direction. The second support part 62 can be a multi-point structure or a guide rail structure, such as a ball, a sliding block or a guide rod, arranged along the optical axis direction. When a guide rod is used as the support part, the guide rod has good linearity, which can increase the stability and reliability of the movable part 20 when the movable part 20 is driven to move, and further reduce the risk of tilting or overturning of the optical lens 100. Specifically, the second support groove 231 provided with the second support part 62 can be trapezoidal, rectangular or V-shaped.

[0104] It can be understood that when the first support part 61 is a ball and the second support part 62 is a guide rod, the downward pressure on the second support part 62 is mainly the magnetic force provided by the magnetic assembly 70, which is smaller than the pressure on the first support part 61, which includes the magnetic force provided by the magnetic assembly 70 and the pre-pressing force provided by the pre-pressing part 40. In this way, the friction force generated by the surface contact of the second support part 62 can be reduced, and the power consumption of the piezoelectric actuator 30 can be reduced. On the other hand, if the first support part 61 is a guide rod, the guide rod structure with a large friction coefficient will generate a large friction force due to surface contact under the action of a large pressure, which will affect the driving effect of the piezoelectric actuator 30. It can be understood that when a 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.

[0105] 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, or as a boss, which uses point contact friction, which is beneficial to reducing the wear of the guide groove and the support groove, and prolonging the service life of the camera module.

[0106] As described above, in some embodiments of the support part of the present application, the first support part 61 and the second support part 62 both use balls as the support structure, wherein the number of balls arranged on the same side of the piezoelectric actuator 30 is greater than the number of balls arranged on the opposite side of the piezoelectric actuator 30, for example, the number of support balls 601 of the first support part 61 is greater than the number of support balls 601 of the second support part 62. Through the asymmetric arrangement of the balls and the driving position of the piezoelectric actuator 30, the risk of tilting of the driving device can be reduced, and the risk of ball indentation or jamming can also be reduced, thereby improving the reliability and stability of the driving device.

[0107] Since the piezoelectric actuator 30 drives at the top of the first movable side wall 21, the pressing block 50 is located at the top of the pre-pressing part 40, which generates a pre-pressing force parallel to the second direction and pointing to the first support part 61 at the bottom of the first movable side wall 21. By adjusting the size of the pre-pressing force, the stress of the first support part 61 is greater than that of the second support part 62 at the second movable side wall 23, so as to reduce the overturning moment of the first movable side wall 21 and ensure the stability and reliability of the driving device.

[0108] To solve the above problems, the first support part 61 has a larger number of rolling balls, which can significantly increase the effective support area on the same side of the piezoelectric actuator 30 and provide more stable support for the movable part 20. In addition, more rolling balls can share the pre-pressing force, especially in the case of falling or impact, multiple rolling balls can disperse the impact force and significantly inhibit the formation of pits on the contact surface.

[0109] Further, the length of the guide groove is designed as long as possible, specifically, a through guide groove is arranged at the bottom of the first movable side wall 21 to accommodate the rolling balls of the first support part 61, which increases the movement space of the first support part 61 and the movement flexibility of the rolling balls, reduces the risk of sliding friction and jamming, and thus meets the long-stroke movement requirement of the movable part 20.

[0110] Further, the first support part 61 is arranged to have rolling balls of different sizes, i.e., the first support part 61 includes at least two support rolling balls 601 and at least one small rolling ball 602, wherein the sizes of all the support rolling balls 601 are consistent, and the size of the small rolling ball 602 is smaller than that of the support rolling ball 601.

[0111] As shown in FIG. 6, the first support part 61 is arranged to have rolling balls of different sizes, i.e., the first support part 61 includes at least two support rolling balls 601 and at least one small rolling ball 602, wherein the sizes of all the support rolling balls 601 are consistent, and the size of the small rolling ball 602 is smaller than that of the support rolling ball 601. Figure 11 and Figure 16As shown, the first support portion 61 is implemented to include two supporting balls 601 at the front and rear and at least one small ball 602 located between the two. The second support portion 62 is implemented as one supporting ball 601. The three supporting balls 601 each provide a supporting contact point at the bottom of the movable portion 20. The three supporting balls 601 form a triangular supporting surface with a minimum number of supporting balls 601, thereby improving the stability of the support. Among them, in the first support portion 61 at the bottom of the first movable side wall 21, at least one small ball 602 fills the gap between the front and rear supporting balls 601 along the optical axis, extending the side support line and adjusting the distance between the two supporting contact points to optimize the distribution of contact points. At the same time, it improves the movement state of the front and rear supporting balls 601 during the driving process, reduces sliding wear, and improves the stability of the driving device. When the driving device falls or collides, the small ball 602 can disperse the impact force to prevent the supporting balls 601 from forming pits due to concentrated force, thereby improving the reliability of the driving device.

[0112] Specifically, the support ball 601 serving as the first support part 61 is tightly clamped between the second guide groove 211 and the first guide groove 111, providing support and guidance for the first movable side wall 21 on which the piezoelectric actuator 30 is provided. The support ball 601 serving as the second support part 62 is loosely clamped between the second support groove 231 and the first support groove 131. While taking the first support part 61 as the main supporting component and maintaining the basic supporting function, it provides a certain degree of tilt buffering flexibility for the movable part 20 during movement, reduces redundant constraints, and avoids drive failure caused by the superposition of multi-directional stresses.

[0113] Since the size of the support ball 601 is larger than that of the small ball 602, the small ball 602 of the first support part 61 is loosely clamped in the second guide groove 211 and the first guide groove 111, preventing the first and last support balls 601 of the first support part 61 from getting stuck in the guide groove during movement, so that the two support balls 601 are always in a rolling state, reducing friction.

[0114] In some embodiments, the driving device further comprises an inner insert arranged at the abutting surface of the first support portion 61 and the first guide groove 111, so as to provide a more flat support surface for the first support portion 61. Further, the inner insert of the first guide groove 111 has the same shape as the first guide groove 111, for example, the first guide groove 111 is a V-shaped groove, and the inner insert also has a V-shaped structure; the first guide groove 111 is a U-shaped groove, and the inner insert also has a U-shaped structure, or the inner insert also has a flat structure. On the one hand, it helps to slow down the wear of the first support portion 61 when moving in the first guide groove 111, prolonging the service life of the first support portion 61; it can also reduce the risk of the first support portion 61 being stuck during use, further improving the use quality and life of the camera module. On the other hand, it slows down the deformation phenomenon of the first support portion 61 due to excessive force under the action of the pre-pressure, further enhancing the use reliability of the camera module.

[0115] In some embodiments, the driving device further comprises an inner insert arranged at the abutting surface of the first support groove 131 and the second support portion 62, so as to enhance the support effect on the second support portion 62. The inner insert of the first support groove 131 has the same shape as the first support groove 131, for example, the first support groove 131 is a V-shaped groove, and the inner insert also has a V-shaped structure; the first support groove 131 is a U-shaped groove, and the inner insert also has a U-shaped structure, or the inner insert also has a flat structure. Through the inner insert structure, on the one hand, it helps to slow down the wear of the second support portion 62 when moving in the first support groove 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 life of the camera module.

[0116] In some embodiments, the second guide groove 211 and the second support groove 231 in the movable part 20 and the abutting surface of the support part structure are also provided with an insert structure. That is, the first support part 61 is in contact with the insert in the second guide groove 211 and the insert in the first guide groove 111, respectively, and the second support part 62 is in contact with the insert in the second support groove 231 and the insert in the first support groove 131, respectively. By providing the insert structure, the wear of the first support part 61 when moving between the first guide groove 111 and the second guide groove 211 is reduced, and the wear of the second support part 62 when moving between the second support groove 231 and the first support groove 131 is reduced, further improving the use quality and service life of the camera module. On the other hand, the deformation phenomenon such as dent of the first support part 61 and the second support part 62 caused by excessive force is reduced, further enhancing the use reliability of the camera module.

[0117] Further, the insert can also be provided in the guide groove and the support groove in the above manner to achieve similar functions, which will not be described here.

[0118] In some embodiments of the length of the guide groove of the present application, the difference between the length of the guide groove and the minimum distance of the first support part 61 is not less than the mechanical stroke of the movable part 20, so that all the support balls 601 of the first support part 61 can roll during the entire movement of the movable part 20 to support the movable part 20, and the movable part 20 has sufficient movement distance to realize the focusing function of the camera module.

[0119] In some embodiments of the present application, the movable part 20 further comprises a friction part 22 provided on the first movable side wall 21 of the movable part 20 and facing 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 by the pre-pressing force of the pre-pressing part 40. It can be understood that the friction part 22 provided in the present application helps to improve the friction force between the movable part 20 and the friction head 32 of the piezoelectric actuator 30, further enhancing the driving force provided by the piezoelectric actuator 30.

[0120] Specifically, the friction part 22 is implemented as a friction plate 221, which is a separate structure from the movable part 20 and is attached to the first movable side wall 21 of the movable part 20 by an adhesive. This not only realizes the friction contact with the friction head 32, but also improves the controllability of the friction condition, and the separate structure reduces the difficulty of manufacturing and maintenance, which is beneficial to improve the service life of the camera module.

[0121] In some embodiments, the friction plate 221 can also be integrally formed on the first movable side wall 21 of the movable part 20.

[0122] It can be understood that the friction plate 221 is arranged to enhance the friction between the movable part 20 and the friction head 32 of the piezoelectric actuator 30, which is conducive to improving the driving performance of the camera module.

[0123] Referring to Figure 2 and Figure 16 In some embodiments of the friction plate 221 of the present application, at least a portion of the friction plate 221 and the bottom of the movable part 20 are in frictional contact with the piezoelectric actuator 30 and the first support part 61, respectively. Under the action of the pressing block 50 and the pre-pressing member 40, the first support part 61 provides an upward support force to the movable part 20 in the second direction, and provides support and guidance for the stable movement of the movable part 20 in the optical axis direction in the fixed part 10. The direction of the pre-pressing force is opposite to the direction of the support force, and both act on the first movable side wall 21, further avoiding the inclination of the movable part 20, thereby enhancing the stability of the optical lens 100 during optical focusing and / or optical zooming of the camera module, and further improving the imaging quality of the camera module.

[0124] It can be understood that the piezoelectric actuator 30 is arranged on the upper portion of the friction plate 221 in the second direction and drives the movable part 20 on the top side of the movable part 20. The pre-pressing member 40 provides a pre-pressing force downward on the top side of the piezoelectric actuator 30 in the second direction, so that the friction head 32 is in frictional contact with the friction plate 221 of the movable part 20. The piezoelectric actuator 30 provides a driving force to the movable part 20 to drive the movable part 20 to move in the optical axis direction. Further, the first support part 61 arranged between the fixed part 10 and the movable part 20 provides a support force to the movable part 20 upward in the second direction, and the support force is opposite to the pre-pressing force, which is conducive to preventing the movable part 20 from being in surface contact with the fixed part 10, which further causes the phenomenon that the friction is too large to be conducive to driving.

[0125] As shown in Figure 3 and Figure 16 The piezoelectric actuator 30 has at least one friction head 32 to provide sufficient driving force to the movable part 20 to ensure that the movable part 20 moves in the optical axis direction under the action of the driving force.

[0126] As shown in Figure 16 and Figure 21As shown, at least part of the friction plate 221 is in friction contact with the friction head 32 of the piezoelectric actuator 30, i.e. the total length of the friction plate 221 is greater than the length of the active area of the friction head 32 of the piezoelectric actuator 30, so that the friction head 32 and the friction plate 221 are always in friction contact during the movement of the movable part 20, and the length of the friction plate 221 can adapt to the micro-offset of the friction head 32, absorbing the displacement deviation caused by assembly tolerance or vibration, ensuring the close fit of the contact surface, thereby ensuring the continuous transmission of driving force.

[0127] In some embodiments of the length of the friction plate 221 of the present application, the length of the friction plate 221 is less than the length of the ball groove arranged on the same side of the piezoelectric actuator 30 and greater than the length of the ball groove arranged on the opposite side of the piezoelectric actuator 30 along the optical axis, i.e. the length of the friction plate 221 is less than the length of the guide groove and greater than the length of the support groove, which can adapt to the piezoelectric actuator 30 to apply a pre-pressing force and provide driving force in friction contact, while avoiding the influence of the too short friction plate 221 on the movement stroke, and the friction plate 221 is arranged on the same side of the guide groove with a longer length, which cooperates with the piezoelectric actuator 30 on the side and the first support part 61 clamped tightly in the guide groove, which is beneficial to the camera module to achieve a larger movement stroke and reduce the risk of overturning of the movable part 20.

[0128] In some embodiments of the present application, the minimum total length of the first support part 61 is greater than the distance between the two friction heads 32, i.e. the distance between the first and last support balls 601 arranged on the same side of the piezoelectric actuator 30 is greater than the distance between the two friction heads 32 of the piezoelectric actuator 30, so that the friction point of the friction head 32 during driving is located within the support range of the first and last support balls 601, which improves the support effect of the first support part 61 and ensures the smooth movement of the movable part 20.

[0129] The diameter difference between the support ball 601 and the small ball 602 is not greater than 0.2 mm, which can avoid the inconsistent rolling tracks of the balls on the track caused by the too large diameter difference between the balls, thereby reducing the influence on the stability of rolling friction, and preventing the balls from moving out of sync due to the too large diameter difference between the balls, which effectively prevents the movable part 20 from tilting.

[0130] In the present application, as Figures 8 to 10 , Figure 17As shown, the driving device further comprises a magnetic attraction assembly 70, which comprises a first magnetic attraction element 71 arranged on the main body of the fixed part 10 and a second magnetic attraction element 72 arranged on the bottom of the movable part 20. The first magnetic attraction element 71 and the second magnetic attraction element 72 are oppositely arranged along the second direction and interact to generate a magnetic attraction force. Along the first direction, the distance from the second magnetic attraction element 72 to the second support part 62 is smaller than the distance from the second magnetic attraction element 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 element 72 is arranged on the second movable side wall 23 of the movable part 20, and the first magnetic attraction element 71 is arranged on the second fixed side wall 13 of the fixed part 10. The first magnetic attraction element 71 and the second magnetic attraction element 72 are oppositely arranged along the second direction and interact to generate a magnetic attraction force. Since the direction of the magnetic attraction force is the same as that of the pre-pressing force, the pre-pressing force and the magnetic attraction force are superimposed on each other, and in the case that the magnetic attraction force is not enough to resist the external force, the pre-pressing force can provide additional support. Further, since the magnetic attraction assembly 70 is arranged on the bottom of the movable part 20 and the piezoelectric actuator 30 is arranged on the top side of the movable part 20, the support part can be arranged only on the bottom of the movable part 20 to achieve the support of the movable part 20, further reducing the number of support parts that need to be arranged in the camera module.

[0131] It can be understood that, since the magnetic attraction assembly 70 is arranged on the bottom of the movable part 20, the first movable side wall 21 is subjected to the pre-pressing force, and the movable part 20 has a tendency to overturn, so it is necessary to set the magnetic attraction force to reduce the risk of overturning of the movable part 20. Among them, the magnetic attraction force and the pre-pressing force are in the same direction, and 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 on the other hand, the magnetic attraction force and the pre-pressing force cooperate with each other, further balance the stress of the movable part 20, and help to reduce the optical lens 100 tilting phenomenon caused by the unbalanced moment.

[0132] In some embodiments of the present application, the second magnetic attraction element 72 is arranged in the middle region between the two second support grooves 231 along the optical axis direction, so as to reduce the overturning moment value and further reduce the risk of tilting of the movable part 20.

[0133] Specifically, as shown in Figure 10 and Figure 17As shown, the first magnetic attraction member 71 is a metal yoke, which includes a base portion 711 and a supporting portion 712. At least a portion of the base portion 711 overlaps the second magnetic attraction member 72 along the second direction. At least a portion of the supporting portion 712 overlaps the second supporting portion 62 along the second direction. By providing the first magnetic attraction member 71, on one hand, the magnetic attraction force is enhanced, the pre-pressing force is better balanced, and the risk of overturning of the movable portion 20 is reduced. On the other hand, the supporting portion is stably clamped between the movable portion 20 and the fixed portion 10 by the magnetic attraction force, the stability of the supporting portion is improved, and the imaging quality of the camera module is improved.

[0134] In some embodiments of the structure of the first magnetic attraction member 71 of the present application, the base portion 711 and the supporting portion 712 of the first magnetic attraction member 71 are integrally connected, which improves the processing convenience and efficiency. Further, the base portion 711 and the supporting portion 712 can be separately provided, which helps to improve the flatness of the base portion 711. However, when the area of the base portion 711 is too large, deformation may occur.

[0135] In some embodiments of the shape of the supporting portion 712 of the present application, the supporting portion 712 can be V-shaped or planar according to the shape of the first guide groove 111 and the first supporting groove 131, and is arranged on the lower side of the first supporting portion 61 and / or the second supporting portion 62 along the second direction. This avoids the formation of pits on the first supporting portion 61 and the second supporting portion 62, and further improves the use quality and service life of the camera module.

[0136] Further, one of the first magnetic attraction member 71 and the second magnetic attraction member 72 is a magnet, and the other is a magnet or a yoke suitable for being attracted to the magnet. The magnet or the yoke can be fixed by adhesion, insert molding, riveting, etc. Since the first movable side wall 21 and the second movable side wall 23 of the movable portion 20 are subjected to the pre-pressing force and the magnetic attraction force, respectively, and the direction of the magnetic attraction force is the same as that of the pre-pressing force, the risk of tilting of the movable portion 20 is reduced. Specifically, the pre-pressing force can be greater than the magnetic attraction force. When the magnetic attraction force is too large, the frictional resistance that needs to be overcome by the movable portion 20 during driving movement is also large, which further increases the power consumption of the piezoelectric actuator 30, and is not conducive to driving the movable portion 20.

[0137] In some embodiments, the first magnetic member 71 is a magnet, the second magnetic member 72 is an insert-molded yoke, and the yoke can also serve as the conducting member 14 of the fixed part 10 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 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 improve the stability of the optical lens 100.

[0138] In some embodiments, the magnetic assembly 70 further includes the first magnetic member 71 and the 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 support 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 due to unbalanced torque, and further reduce the risk of tilting of the optical lens 100.

[0139] Reference Figure 1 , Figure 4 and Figure 11 In some embodiments, the circuit assembly in the camera module further includes a conducting member 14 arranged around the outer peripheral wall of the fixed part 10. Specifically, the conducting member 14 is embedded in or attached to the first fixed side wall 11 and the second fixed side wall 13. At least part of the conducting member 14 is exposed to the outer peripheral side of the fixed part 10. The conducting member 14 is provided with a conducting portion 141. The conducting member 14 is welded to the extended end of the conductive member 33 through the conducting portion 141 and is electrically connected. The conducting member 14 can also be used to conduct electricity for the light sensing assembly 80, the circuit part of the light turning element 90, and other circuit modules. Figure 2 The conducting member 14 with a bending structure is easy to connect and can adapt to complex spatial layout and shape requirements, further improving the space utilization rate.

[0140] In some embodiments, the driving device further includes a conductive member 33, as shown in Figure 3As shown, the conductive member 33 includes a first connecting portion 331, a second connecting portion 333, and a conductive portion 334. The first connecting portion 331 is a horizontal plate disposed along the second direction between the piezoelectric active portion 31 of the piezoelectric actuator 30 and the pre-compression member 40. The second connecting portion 333 is a vertical plate integrally bent along the second direction from the first connecting portion 331. The conductive portion 334 extends from the second connecting portion 333 along the outer peripheral wall of the fixed portion 10 in the optical axis direction and is connected to the conductive member 14 provided on the fixed portion 10. The first connecting portion 331 is a horizontal plate disposed along the second direction between the piezoelectric active portion 31 of the piezoelectric actuator 30 and the pre-compression member 40. The first connecting portion 331 may have a through hole to reduce the impact of the conductive member 33 on the piezoelectric active portion 31. The second connecting portion 333 is a vertical plate integrally bent in the second direction from the first connecting portion 331. The conductive portion 334 extends from the second connecting portion 333 in the second direction along the outer wall of the fixing portion 10 and is connected to the conductive member 14 provided on the fixing portion 10. The provision of the conductive member 33 increases space utilization within the camera module and achieves electrical conductivity.

[0141] like Figures 2-10 The conductive member 33 shown includes a first connecting portion 331, a second connecting portion 333, and a conductive portion 334. The first connecting portion 331 is a horizontal plate disposed along the second direction between the piezoelectric actuator 30 and the pre-compression member 40. The second connecting portion 333 is a vertical plate integrally bent along the second direction from the first connecting portion 331. The conductive portion 334 extends from the second connecting portion 333 along the outer peripheral wall of the fixing portion 10 in the direction of the optical axis and connects to the conductive member 14 provided on the fixing portion 10. The provision of the conductive member 33 increases space utilization within the camera module and achieves electrical continuity.

[0142] In this application, if Figures 11 to 20 As shown, the driving device further includes a position sensing assembly 110 for improving the accuracy of motion position control. The position sensing assembly 110 includes a position sensing element 1101 and a position sensing magnet 1102 arranged opposite to each other along a first direction. The position sensing element 1101 is located on the first fixed side wall 11 of the fixed portion 10, and the position sensing magnet 1102 is located on the first movable side wall 21 of the movable portion 20 to sense the position of the optical lens 100 on the movable portion 20.

[0143] The driving device further comprises a flexible circuit board 15 arranged outside the first fixed side wall 11, the flexible circuit board 15 comprising an inner side and an outer side opposite in the first direction, at least a part of the position sensing element 1101 and the conductive piece 33 are respectively located on both sides of the flexible circuit board 15 and electrically connected with the flexible circuit board 15 in the first direction, which facilitates the conduction of the position sensing element 1101 and the conductive piece 33, and facilitates the welding of the conductive piece 33.

[0144] For the need of the position sensing function, the position sensing element 1101 needs to be arranged on the first fixed side wall 11, so that the corresponding position sensing magnet 1102 is closer to the piezoelectric actuator 30 as the driving source, the measurement is more accurate, and the signal transmission is faster. It should be understood that when the movable part 20 tilts, according to the principle of the inner wheel difference, the tilt angle on the same side of the position sensing magnet 1102 is greater than the tilt angle on the opposite side of the position sensing magnet 1102, therefore, the position sensing magnet 1102 is closer to the piezoelectric actuator 30 on the same side, and the sensing is more obvious. Further, the conductive piece 33 is electrically connected with the piezoelectric actuator 30 to conduct the piezoelectric actuator 30 and the flexible circuit board 15, and the conductive piece 33 is bent and extends from the same side of the piezoelectric actuator 30 to the outside of the first fixed side wall 11, which not only simplifies the structure of the conductive piece 33, but also makes the welding of the conductive piece 33 and the flexible circuit board 15 more convenient, so the position sensing element 1101 and the conductive piece 33 are designed on the same side of the first movable side wall 21 in the present application. Further, the position sensing element 1101 needs to correspond to the position sensing magnet 1102 in the first direction to achieve better sensing effect, therefore, the position sensing element 1101 is located on the inner side of the flexible circuit board 15 in the present application to facilitate the relative position of the position sensing element 1101 and the position sensing magnet 1102, so as to improve the sensing accuracy of the position sensing element 1101.

[0145] In the present application, the first fixed side wall 11 has a mounting groove 115, the position sensing element 1101 is arranged in the mounting groove 115 to electrically connect the inner side of the flexible circuit board 15, and the conductive piece 33 is bent to the outer side of the flexible circuit board 15 to electrically connect the flexible circuit board 15. Specifically, the mounting groove 115 is opened along the first direction and penetrates through the first fixed side wall 11 to accommodate the position sensing element 1101, so that the position sensing element 1101 is opposite to the position sensing magnet 1102, avoiding the installation of the position sensing assembly 110 to increase the assembly tolerance between the movable part 20 and the fixed part 10, thereby avoiding the increase of the overall width size of the camera module.

[0146] At least a part of the flexible circuit board 15 is arranged on the outside of the mounting groove 115, which further facilitates the circuit conduction of the position sensing element 1101.

[0147] It should be understood that if the conductive piece 33 is conducted on the inside of the flexible circuit board 15, on the one hand, the conductive piece 33 may interfere with the position sensing element 1101, affecting the conduction between the position sensing element 1101 and the flexible circuit board 15; on the other hand, the conductive piece 33 needs to be connected to the piezoelectric actuator 30 and welded to the flexible circuit board 15, that is, the conductive piece 33 includes at least two connecting parts, respectively connected to the piezoelectric actuator 30 and the flexible circuit board 15, and the planes of the piezoelectric actuator 30 and the flexible circuit board 15 are perpendicular to each other, so the planes of the at least two connecting parts of the conductive piece 33 are perpendicular to each other. That is, the conductive piece 33 needs to be bent first and then welded to the flexible circuit board 15, and if the bending angle is too small, the conductive piece 33 is prone to breakage due to excessive bending. In addition, the fixed part 10 and the movable part 20 have very small assembly tolerance, that is, the gap between the first fixed side wall 11 and the first movable side wall 21 is very small, and the space for bending the conductive piece 33 is very small, and the stress on the conductive piece 33 at the bending position is greater, increasing the risk of breakage when bending.

[0148] Therefore, in the present application, the conductive piece 33 is conducted on the outside of the flexible circuit board 15. By this conduction mode, the risk of breakage due to excessive bending of the conductive piece 33 can be reduced in a limited space, and the conduction mode of the conductive piece 33 and the position sensing element 1101 is simplified, that is, the conductive piece 33 and the position sensing element 1101 are concentrated on the flexible circuit board 15, and then the flexible circuit board 15 is connected to other external components, the circuit is simpler, and the welding of the conductive piece 33 and the flexible circuit board 15 is more convenient. Further, the structure of the driving device can be more compact.

[0149] In some embodiments, the flexible circuit board 15 includes a top part close to the piezoelectric actuator 30 and a bottom part away from the piezoelectric actuator 30, and the conductive piece 33 is bent from the top part of the piezoelectric actuator 30 and extends to the bottom part of the flexible circuit board 15 to be welded and conducted. By setting the welding point position on the conductive piece 33 and the flexible circuit board 15, the number of bending of the conductive piece 33 is reduced, thereby simplifying the structure of the conductive piece 33 and reducing the risk of breakage of the conductive piece 33.

[0150] In some embodiments of the conductive member 33 of the present application, the conductive member 33 includes a main body 3301, an extension 3302, and a soldering portion 3303. The main body 3301 is located at the top of the piezoelectric actuator 30. The extension 3302 is bent along the second direction from the plane where the main body 3301 is located. The soldering portion 3303 is connected to the extension 3302 and is electrically connected to the bottom of the flexible circuit board 15. The plane where the main body 3301 is located is perpendicular to the plane where the flexible circuit board 15 is located. The plane where the extension 3302 is located is parallel to the plane where the flexible circuit board 15 is located. The second direction is perpendicular to the optical axis direction and the first direction. Figure 18 and Figure 19 As shown, the main body 3301 is located between the pre-pressed part 40 and the piezoelectric actuator 30, and is a horizontal plate extending along the XY interface. The extension part 3302 and the welding part 3303 are vertical plates extending from the outer surface of the first fixed side wall 11 of the fixed part 10. The horizontal plate and the vertical plate are connected through the bending area of ​​the extension part 3302, and the extended end of the vertical plate of the conductive part 33 is the welding part 3303, which is used to weld the flexible circuit board 15 located on the outside of the first fixed side wall 11, thereby increasing the space utilization inside the camera module and achieving electrical conductivity.

[0151] In some embodiments, the main body 3301 is located at the top of the piezoelectric active part 31 of the piezoelectric actuator 30, and the extension portion 3302 extends from both ends of the main body 3301 along the optical axis and then bends along a second direction. Because the two ends of the conductive member 33 are electrically connected to the piezoelectric active part 31 and the flexible circuit board 15 through the main body 3301 and the welding portion 3303, respectively, the main body 3301 will deform under the influence of the vibration of the piezoelectric active part 31, generating a reaction force, which in turn reversely affects the vibration of the piezoelectric active part 31. In the present application, the extension portion 3302 extends from both ends of the main body 3301 along the optical axis. Because the vibration of the piezoelectric active part 31 has a certain directionality and amplitude, the extension portion 3302 extends from both symmetrical sides of the main body 3301 to generate symmetrical reaction forces, thereby reducing the impact of the reaction force on the piezoelectric active part 31 and helping to maintain the stability of the vibration of the piezoelectric active part 31.

[0152] In the present application, the extension portion 3302 is bent from both ends of the main body portion 3301 along the optical axis direction toward the outer surface of the first fixed side wall 11 of the fixed portion 10 and extends along the second direction, so that the extension portion 3302 has a larger length along the second direction and a smaller width along the optical axis direction, so as to reduce the tensile force generated by the welding of the welding portion 3303 and the flexible circuit board 15, thereby reducing the influence of the reaction force on the piezoelectric active portion 31.

[0153] Specifically, the extension portion 3302 includes an integrally formed extension area 33021 and an extension leg 33022. The extension area 33021 extends from both ends of the main body 3301 in the optical axis direction, and then bends along the second direction to connect the extension leg 33022. The extension leg 33022 is connected to the welding portion 3303 at the bottom along the second direction. The main body 3301, the extension area 33021, the extension leg 33022 and the welding portion 3303 form an opening 3300 to ensure that the extension portion 3302 has sufficient length along the second direction and a smaller width along the optical axis direction, thereby further reducing the tensile force generated by the welding of the welding portion 3303 and the flexible circuit board 15, and reducing the influence of its reaction force on the piezoelectric active portion 31.

[0154] In addition, the above-mentioned method of welding at the bottom of the flexible circuit board 15 can increase the extension length of the extension leg 33022 after the conductive part 33 is bent. The lower the welding position of the flexible circuit board 15 and the welding portion 3303, the longer the length of the extension leg 33022 of the extension portion 3302, further reducing the tension generated by the welding of the welding portion 3303 and the flexible circuit board 15, thereby reducing the influence of its reaction force on the piezoelectric active portion 31, thereby ensuring the driving performance of the piezoelectric actuator 30.

[0155] like Figures 18 to 22 As shown, in the present application, the pre-press 40 includes a pre-press main body and a pre-press deformable body. The pre-press deformable body extends from both ends of the pre-press main body along the optical axis. Because the extension area 33021 of the extension portion 3302 of the conductive member 33 overlaps with the projection of the pre-press deformable body of the pre-press 40 along the second direction, when the extension area 33021 is high, the deformation of the pre-press deformable body and the deformation of the extension area 33021 may interfere with each other under the vibration of the piezoelectric active portion 31. The pre-press main body is implemented as the elastic portion 42 in the pre-press 40, and the pre-press deformable body is implemented as the bent portion 43 in the pre-press 40.

[0156] In some embodiments of the present application, along the second direction, the distance from the top surface of the main body 3301 of the conductive member 33 to the bottom surface of the pre-pressed member body is H1, and the distance from the top surface of the extension portion 3302 of the conductive member 33 to the bottom surface of the pre-pressed member deformation body is H2, H1≤H2, that is, the distance H2 from the top surface of the extension portion 3302 to the bottom surface of the pre-pressed member deformation body needs to be increased to avoid interference between the deformation of the pre-pressed member deformation body and the deformation of the conductive member 33 under the vibration of the piezoelectric active portion 31, thereby ensuring the driving effect of the piezoelectric actuator 30.

[0157] In some embodiments, a mounting portion 44 is provided between the pre-pressed component body and the main body portion 3301 of the conductive component 33 to increase the distance H1 from the top surface of the main body portion 3301 to the bottom surface of the pre-pressed component body. Figure 21 As shown, by raising the pre-pressed part 40 to increase H1, the distance between the pre-pressed part 40 and the conductive part 33 is increased, and the probability of interference between the conductive part 33 and the pre-pressed part deformation body is reduced, thereby ensuring the driving effect of the piezoelectric actuator 30.

[0158] In some embodiments, when the mounting portion 44 is provided, H1 may be equal to H2 as long as there is a deformation space between the pre-pressing member 40 and the conductive member 33 so as not to interfere with each other.

[0159] Furthermore, there is a height difference between the plane where the extension area 33021 of the extension portion 3302 is located and the plane where the main body portion 3301 is located, and the extension portion 3302 is connected to the main body portion 3301 through an inclined connection portion, such as Figure 23 As shown, a slope is formed from one end of the main body 3301 to the adjacent extension region 33021. This increases the height H2 and facilitates the connection between the conductive member 33 and the flexible circuit board 15. It should be understood that because the conductive member 33 and the flexible circuit board 15 are connected and electrically connected at the bottom of the camera module, the conductive member 33 is pulled during the welding process. This process presents some difficulty in maintaining the plane of the extension region 33021 of the conductive member 33 parallel to the plane of the main body 3301. Therefore, a height difference between the plane of the extension region 33021 and the plane of the main body 3301 facilitates assembly.

[0160] In some embodiments, as Figure 2 、 Figure 3 and Figure 11 As can be seen from the foregoing, the piezoelectric actuator 30 includes the piezoelectric active portion 31, the friction head 32, and the conductive member 33. The piezoelectric actuator 30 abuts against the movable portion 20 under the action of preload. Specifically, the friction head 32 is provided on the side of the piezoelectric active portion 31 facing the first movable sidewall 21. The piezoelectric active portion 31 generates mechanical resonant motion through the inverse piezoelectric effect. When the frequency of the applied voltage matches the natural frequency of the piezoelectric active portion 31, resonance occurs and ultrasonic waves are generated. Therefore, oscillatory reciprocating motion or elliptical motion can be achieved on the specifically configured electrode layer, thereby driving the friction head 32 to perform oscillatory reciprocating motion or elliptical motion. Furthermore, through friction between the friction head 32 and the first movable sidewall 21, the movable portion 20 is driven to slide relative to the fixed portion 10.

[0161] refer to Figure 2 、Figure 3 and Figure 11 It can be known that, in some embodiments, the piezoelectric actuator 30 further comprises a buffer 34 arranged between the pre-pressing member 40 and the piezoelectric active part 31. Since the elastic modulus of the buffer 34 is lower than that of the pre-pressing member 40, the buffer 34 is more likely to deform than the pre-pressing member 40, so that different degrees of shrinkage deformation can be adaptively generated according to different tolerances in different piezoelectric actuators 30, so that the pre-pressing force difference of each piezoelectric actuator 30 with different tolerances is reduced. In other words, the buffer 34 which can deform can reduce 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 34 can also absorb part of the vibration deformation of the piezoelectric active part 31 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.

[0162] It can be understood that the buffer 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 34 can be smaller than, equal to, or greater than the size of the piezoelectric active part 31, so that the buffer 34 fills between the piezoelectric active part 31 and the pre-pressing member 40. Similarly, the specific shape and number of the buffer 34 are not limited in the present application. For example, two pieces of adhesive tape can be used as the buffer 34, or two pieces of adhesive tape can be arranged in the second direction. Preferably, the size of the buffer 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 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.

[0163] Specifically, the buffer 34 can also be a low-modulus glue arranged on the surface of the piezoelectric active part 31. That is, since the buffer 34 can be attached between the pre-pressing member 40 and the circuit substrate, it not only has the advantage of facilitating 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 with an adhesive such as UV glue or heat-curing glue.

[0164] As Figure 2 , Figure 3 and Figure 11It can be seen that 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 the polarization direction and the electric field direction. This effect means that when an electric field is applied in the polarization direction of the 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 and other 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 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.

[0165] In a specific embodiment of the present application, the piezoelectric active part 31 adopts a multi-layer stacked structure. Specifically, the piezoelectric active part 31 is stacked alternately by ceramic layers and electrode layers in the thickness direction, in the order of ceramic layer, electrode layer, ceramic layer, electrode layer…ceramic layer, electrode layer, ceramic layer. 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 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, wherein 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 realized 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 the piezoelectric active part 31 in a laminated form. 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.

[0166] It can be understood that the side electrical connection parts in the camera module are respectively connected to 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.

[0167] 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, which can be single-layer ceramic body or multi-layer ceramic body, or single-layer single crystal or multi-layer single crystal, 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.

[0168] In some embodiments, the piezoelectric active part 31 is rectangular in shape along the optical axis direction, and the friction head 32 is provided 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 spaced apart 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 one friction head 32, driving the movable part 20 by two friction heads 32 can achieve better long-stroke movement.

[0169] In some embodiments, the friction head 32 is made of wear-resistant material, such as various high-hardness wear-resistant ceramic materials, such as alumina, zirconia, silicon carbide ceramic, or high-wear-resistant metal materials, carbon fiber materials, or ceramic, metal particle and high-molecular composite materials, etc. The use of wear-resistant material can improve the wear resistance of the friction head 32, increase 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 prolong the service life of the friction head 32 due to good wear resistance. In addition, in some embodiments, the friction head 32 and the piezoelectric active part 31 can be an integral 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 the connection strength by surface contact between the two, and the friction head 32 can move obviously with the deformation of the piezoelectric active part 31.

[0170] In some embodiments, the piezoelectric active part 31 performs bending vibration along the second direction in a mode of one crest and one 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 set at the position of the crest and 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 table, a cylinder, a semi-cylinder, etc. The number of friction heads 32 can be one or two or more. In the present application, there are no specific restrictions on the shape and number of the friction head 32, the shape of the piezoelectric active part 31, the electrode setting method, and the connection method between the friction head 32 and the piezoelectric active part 31.

[0171] In some embodiments, as Figure 3 As shown, the pressing block 50 includes a pressing beam 51 and a pressing arm 52. The pressing arm 52 extends from both ends of the pressing beam 51 along the second direction toward the fixing portion 10, so that the pressing block 50 is fixed in the first accommodating groove 112 of the fixing portion 10. There is a groove 500 between the pressing beam 51 and the pressing arm 52, and the groove 500 is suitable for providing a deformation space for the pre-pressed part 40. The lower pressure arm 52 includes a lower pressure mounting platform 522 and a lower pressure fixing platform 521. The lower pressure fixing platform 521 is located on the outside of the lower pressure mounting platform 522 along the optical axis direction. The length of the lower pressure fixing platform 521 along the second direction is greater than the length of the lower pressure mounting platform 522 along the second direction, so that the groove 500 is formed between the lower pressure mounting platform 522 and the lower pressure beam 51. The pre-pressing part 40 is installed on the lower pressure mounting platform 522, and the lower pressure fixing platform 521 is fixed to the fixing part 10, further simplifying the assembly process, enhancing the stability of the camera module, and improving the installation stability of the pre-pressing part 40, thereby enhancing the stability of the pre-pressure provided.

[0172] In some embodiments, the first fixing sidewall 11 of the fixing portion 10 further includes a base extension 114 and a second mounting surface 1141. The second receiving groove 113 is formed between the base extension 114. The second mounting surface 1141 is located on the top surface of the base extension 114. The downward pressing fixing platform 521 of the pressing block 50 abuts the second mounting surface 1141. It is understood that the downward pressing arm 52 can be connected to the fixing portion 10, and the downward pressing fixing platform 521 of the pressing arm 52 and the second mounting surface 1141 of the fixing portion 10 can abut each other, further enhancing the stability and reliability of the pressing block 50. Because the downward pressing fixing platform 521 of the pressing arm 52 is located at different height planes, the groove 500 is formed to provide space for deformation of the pre-pressed member 40. Furthermore, by securing the pressing block 50 to the fixing portion 10, it can be adjusted during assembly, thereby reducing the risk of assembly inconsistencies.

[0173] In some embodiments, 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 member 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 member 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 member 40 and the movable part 20 will be tighter, the deformation of the pre-pressing member 40 will be greater, and the pre-pressing force generated by the pre-pressing member 40 will be greater. In other words, the pressing block 50 not only provides a deformation space for the pre-pressing member 40 to maintain the deformation generated by the pre-pressing member 40, but also adjusts the size of the pre-pressing force generated by the pre-pressing member 40, for example, by moving the pressing beam 51 downward in the second direction to further press the pressing block 50, thereby increasing the pre-pressing force of the pre-pressing member 40.

[0174] In some embodiments, as shown in Figure 3 , Figure 6 and Figure 16 , when the pre-pressing member 40 is subjected to the supporting force provided by the first supporting part 61, the pre-pressing member 40 generates a bending deformation protruding upward and generates a pre-pressing force downward in the second direction, thereby providing the movable part 20 with a pre-pressing force downward in the second direction, 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 member 40 are relatively good, which helps to reduce the variation of the pre-pressing member 40.

[0175] In some embodiments, the pre-pressing member 40 adopts an elastic member capable of generating deformation, thereby providing a pre-pressing force that can drive the movable part 20 and the piezoelectric actuator 30 to maintain frictional contact after deformation, so that the friction head 32 in the piezoelectric actuator 30 and the friction part 22 of the movable part 20 are in contact and generate a friction force under the action of the pre-pressing force, thereby driving the movable part 20 to move. Specifically, as shown in Figure 5 , the pre-pressing member 40 is a spring sheet with a bending structure, which generates a bending deformation protruding upward and generates a downward pre-pressing force after being subjected to the pressing force provided by the pressing block 50 and the supporting force provided by the first supporting part 61. It can be understood that since the pre-pressing member 40 will generate a certain tolerance during assembly, the spring sheet 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 sheet with a bending structure has higher consistency.

[0176] In some embodiments, as shown in Figure 3 , Figure 6 andFigure 16 As shown, the pre-compression member 40 includes a fixed end 41, an elastic portion 42, and a bent portion 43, wherein the bent portion 43 is disposed between the fixed end 41 and the elastic portion 42. The fixed end 41 is fixed to the pressure block 50, and the elastic portion 42 abuts against the piezoelectric active portion 31. It is understood that a hollow structure can also be provided in the elastic portion 42 and the bent portion 43 to further reduce the elastic coefficient, thereby helping to reduce the impact of material tolerance, assembly tolerance, or other displacement fluctuations on the pre-compression force.

[0177] Specifically, the distance between the top surface of the main body 3301 of the conductive part 33 and the bottom surface of the elastic part 42 is H1, and the distance between the top surface of the extension area 33021 of the extension part 3302 of the conductive part 33 and the bottom surface of the bending part 43 is H2. H1 is not greater than H2, so as to avoid deformation of the conductive part 33 due to the vibration of the piezoelectric active part 31, and ensure that there is no interference between the conductive part 33 and the deformed body of the pre-compression part 40, thereby ensuring the driving effect of the piezoelectric actuator 30.

[0178] Furthermore, when the pre-pressed member 40 is configured as a spring, Figure 5 As shown, the spring can be bent during manufacture to impart a certain degree of deformation. During assembly, after the spring is assembled with the piezoelectric actuator 30 and the pressure block 50, the spring's inherent deformation exerts a preload on the piezoelectric actuator 30 and the movable portion 20. In other words, pre-deforming the spring prior to subsequent assembly and fixation creates a greater preload on the movable portion 20, improving the driving effect.

[0179] In some embodiments, the pre-compression member 40 has a planar spring structure. It is understood that before the piezoelectric actuator 30 is driven, the deformation of the pre-compression member 40 is generated by the coordinated action of the pressure block 50 and the first support portion 61. The pre-compression member 40 includes a fixed end 41 and an elastic portion 42. The fixed end 41 is fixed to the pressure block 50, and the elastic portion 42 abuts against the piezoelectric active portion 31. When the pre-compression member 40 is subjected to the downward pressure of the pressure block 50 and the supporting force of the first support portion 61, the elastic portion 42 of the pre-compression member 40 will produce an upward convex bending deformation and generate a downward pre-compression force. The existence of the pre-compression force is conducive to maintaining frictional contact between the friction head 32 and the movable portion 20 to generate a stable friction force. The piezoelectric actuator 30 further drives the movable portion 20 to move, thereby enhancing the driving effect.

[0180] In some embodiments, as Figure 6 and Figure 16As shown, the deformation of the pre-pressed part 40 is related to the length of the lower pressing arm 52 of the pressing block 50 along the second direction. In other words, when the thickness of the first movable side wall 21 of the movable part 20 and the piezoelectric actuator 30 along the second direction is determined, when the length of the lower pressing arm 52 along the second direction is smaller, the pressing block 50 needs to move further downward in the second direction to connect the lower pressing arm 52 with the fixed part 10. At this time, the downward pressure exerted by the lower pressing beam 51 on the first support part 61 is stronger, so that the first support part 61 provides greater support force to the pre-pressed part 40, thereby increasing the deformation of the pre-pressed part 40 and further generating a greater pre-pressure. When the length of the lower pressing arm 52 along the second direction is longer, the degree of downward movement of the pressing block 50 along the second direction is smaller, resulting in a smaller deformation of the pre-pressed part 40 and further reducing the generated pre-pressure. It is understandable that the set length value of the lower pressure arm 52 along the second direction cannot be too small, so as to avoid excessive downward pressure, support force and pre-pressure, further causing damage to the piezoelectric actuator 30, and may also cause the first support part 61 to be subjected to excessive downward pressure and pre-pressure, resulting in excessive extrusion and the formation of a pit. In other words, the set length value of the lower pressure arm 52 along the second direction cannot be too large, to prevent the deformation of the pre-pressing part 40 from being too small when the length of the lower pressure arm 52 along the second direction is too large, and the pre-pressure provided to the movable part 20 is small, which cannot meet the demand of driving the movable part 20 to move. On the other hand, increasing the set length value of the lower pressure arm 52 along the second direction will increase the height of the camera module along the second direction, reducing the portability of the camera module.

[0181] In some embodiments, as Figure 3 As shown, each downward-pressing mounting platform 522 of the pressing block 50 is provided with a first mounting plane 523 and a mounting post 524. The mounting post 524 protrudes from the first mounting plane 523 toward the fixed end 41 of the pre-pressed member 40, so that the fixed end 41 of the pre-pressed member 40 is fixed below the first mounting plane 523 via the mounting post 524. The flush lower surface of the downward-pressing mounting platform 522 helps provide a flat mounting surface for the pre-pressed member 40, thereby avoiding the phenomenon of inconsistent heights between the left and right sides of the pre-pressed member 40, thereby preventing the phenomenon of increasing the variation of the pre-pressed member 40 and providing inconsistent pre-pressure on the movable portion 20.

[0182] It can be understood that the mounting column 524 is arranged on both sides of the pressing installation platform 522, and corresponds to the fixing hole 411 arranged on the fixed end 41 of the pre-pressing piece 40. Therefore, when assembled, the mounting column 524 can be inserted into the fixing hole 411, so that the pre-pressing piece 40 can be fixed to the pressing installation platform 522. Specifically, when fixed, the mounting column 524 and the fixing hole 411 can be directly riveted and fixed, or the mounting column 524 and the fixing hole 411 can be fixed by using riveting after the fixed end 41 of the pre-pressing piece 40 and the surface of the pressing installation platform 522 are pre-fixed by using an adhesive. Further, the stability of the pre-pressing piece 40 and the pressing block 50 during installation and use is enhanced, and the stability of the provided pre-pressing force and pressing force is maintained.

[0183] In some embodiments, the pre-pressing piece 40 can be first installed on the pressing block 50, and then the 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. Further, the assembly process of the pre-pressing piece 40 and the pressing block 50 is optimized, the assembly efficiency is increased, and the assembly difficulty is reduced. It can be understood that, during the assembly process, the piezoelectric actuator 30 and the pre-pressing piece 40 are first assembled as a semi-finished product, and then the piezoelectric actuator 30 is assembled with the pre-pressing piece 40 in the next step. If the pre-pressing piece 40 is directly assembled on the fixed part 10, the position of the friction head 32 of the piezoelectric actuator 30 and the movable part 20 needs to be 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. Moreover, due to the characteristics of the pre-pressing piece 40, it is difficult to adjust the pre-pressing piece 40 during the assembly process. Compared with the above-mentioned manner, the pre-pressing piece 40 is first installed on the pressing block 50, and then the pressing arm 52 is fixed to the fixed part 10 after the pressing block 50 is turned over. In the assembly process of the pre-pressing piece 40, the position of the friction head 32 and the movable part 20 does not need to be aligned at all times, the assembly difficulty is reduced, and the pre-pressing piece 40 is adjusted according to the pressing block 50. Moreover, the position between the pressing block 50 and the fixed part 10 can be adjusted to realize the adjustment of the pre-pressing piece 40, and the adjustability is higher.

[0184] In some embodiments, the driving device further comprises a driving control assembly for sensing and controlling the moving position of the movable part 20. The driving control assembly is arranged on the side surface of the movable part 20, so as to reasonably utilize the space of the camera module and increase the compactness of the structure. Further, the driving control assembly can comprise a Hall element, an integrated circuit driver (drive IC), a tunneling magnetoresistance (TMR), and the like.

[0185] 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 part 10 due to the frame shape of the fixed part 10. The optical system comprises, in sequence along the optical axis, a light turning element 90, an optical lens 100 arranged on the light turning path of the light turning element 90, and a photosensitive assembly 80 for receiving light transmitted from the optical lens 100 and imaging. Specifically, the light exit 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. Among them, the light turning element 90 is located inside the fixed part 10 close to the light incident side, the optical lens 100 is located in the central region inside the fixed part 10, and the photosensitive assembly 80 is located inside the fixed part 10 away from the light incident side. The camera module provided by the application has the characteristics of easy assembly and good consistency of pre-pressure in the camera module.

[0186] In some embodiments of the application, the light turning element 90 has an incident surface and an exit surface intersecting each other and changing the propagation direction of light through the light turning element 90 to fold the optical path. The optical lens 100 penetrates along the optical axis and has a lens mounting hole, and at least one optical lens is arranged in the lens mounting hole along the optical axis to realize the converging effect of the optical lens 100 on light. After receiving the converging light, the photosensitive assembly 80 converts the received optical signal into an electrical signal for imaging processing. In some embodiments, the number of optical lenses 100 can be two, 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 to realize optical focusing and optical zooming. Of course, in this example, both of the two optical lenses 100 can be driven to move along the optical axis to realize optical focusing and optical zooming. Further, the number of optical lenses 100 can be three, 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 to realize optical focusing and optical zooming. 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 to move along the optical axis to realize optical focusing and optical zooming. In other specific examples of the application, the number of optical lenses 100 can also be four, five, etc., and is not limited by the application.

[0187] In some embodiments, the flexible circuit board 15 is electrically connected to the photosensitive assembly 80, which further includes a chip circuit board, a photosensitive chip, a filter element, and a filter element support. The photosensitive chip is disposed on and connected to the chip circuit board. The filter element support is located on the side of the photosensitive chip and is disposed on the chip circuit board. The filter element support is integrally formed with the chip circuit board or is a separate structure. The filter element is mounted on the filter element support to maintain the photosensitive path of the photosensitive chip and filter the imaging light entering the photosensitive chip.

[0188] The application also provides a camera module, as shown in Figure 1 , which includes:

[0189] The driving device as described above;

[0190] a light turning element 90 for turning the incident light,

[0191] an optical lens 100 held on the light turning path of the light turning element 90;

[0192] a photosensitive assembly 80 electrically connected to the flexible circuit board 15 for receiving light from the optical lens 100.

[0193] The application also provides an assembly method of a camera module, as shown in Figures 12 to 15 , which includes the following steps:

[0194] S1, providing a fixed part 10;

[0195] 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;

[0196] 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 preset space for the pre-pressing piece 40;

[0197] 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.

[0198] 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, enhancing 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.

[0199] In some embodiments, the assembly method of the camera module further comprises the following step S1:

[0200] 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.

[0201] In some embodiments, the assembly method of the camera module further comprises the following step S2:

[0202] S21, providing a second magnetic attraction member 72, the second magnetic attraction member 72 being arranged on the movable part 20.

[0203] S22, providing a first support part 61 and a second support part 62, assembling the first support part 61 to the first guide slot 111, and assembling the second support part 62 to the first support slot 131, the second magnetic attraction member 72 and the first magnetic attraction member 71 being arranged opposite to each other in a 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.

[0204] In some embodiments, the assembly method of the camera module further comprises the following step S3:

[0205] 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, reducing the assembly difficulty.

[0206] 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.

[0207] 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:

[0208] S31b, coupling the pre-pressing member 40 to the pressing block 50 first, and then installing the piezoelectric actuator 30 to the pre-pressing member 40 to form a pre-pressing driving assembly.

[0209] Specifically, the step S3 further comprises the steps of:

[0210] The step S31 comprises the steps of: assembling the at least two support balls 601 and the at least one small ball 602 disposed on the same side of the piezoelectric actuator 30 to the first guide slot 111, and assembling the at least one support ball 601 disposed on the opposite side of the piezoelectric actuator 30 to the first support slot 131.

[0211] Further, in some embodiments, the step S4 further comprises the steps of:

[0212] The step S41 comprises the steps of: 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 support part 61 by the pressing block 50, and the first support part 61 provides a support force in the second direction for the movable part 20.

[0213] The step S42 comprises the steps of: the pre-pressing member 40 is deformed under the action of the pressing block 50 and the first support part 61, and a pre-pressing force is provided which is opposite to the support force and in the same direction as the pressing force.

[0214] Specifically, in the step S41, the pressing block 50 is installed in the first accommodating slot 112 of the fixed part 10.

[0215] Further, after assembling the piezoelectric actuator 30, the pre-pressing member 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.

[0216] It should be understood that the above assembly method can also be applied to the variant embodiments shown in Figure 11 、 Figures 16-20 Further, in the step S31, the pre-pressing member 40 further comprises a mounting part 44, and the mounting part 44 is fixed to the elastic part 42, so that the elastic part 42 is fixed to the piezoelectric actuator 30 through the mounting part 44.

[0217] The foregoing describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above-described embodiments, and the above-described 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: The movable portion is used to carry the optical lens, wherein the optical lens defines an optical axis, and the movable portion includes a first movable side wall; a fixed portion, wherein the movable portion is movably disposed in the fixed portion, the fixed portion comprising a first fixed side wall, the first movable side wall being opposite to the first fixed side wall along a first direction perpendicular to the optical axis; A position sensing assembly, comprising a position sensing element and a position sensing magnet disposed opposite to each other along a first direction, wherein the position sensing magnet is disposed on the first movable side wall; 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 conductive member disposed on the top of the piezoelectric actuator and electrically connected to the piezoelectric actuator, wherein the conductive member is bent from the top of the piezoelectric actuator to the first fixed side wall; A flexible circuit board is disposed on the first fixed side wall. The position sensing element and at least a portion of the conductive member are respectively located on both sides of the flexible circuit board and are electrically connected to the flexible circuit board.

2. The driving device according to claim 1, wherein The flexible circuit board includes an inner side and an outer side opposite to each other along a first direction, the first fixed side wall has a mounting groove, the position sensing element is arranged in the mounting groove to electrically connect to the inner side of the flexible circuit board, and the conductive member is bent to the outer side of the flexible circuit board to electrically connect to the flexible circuit board.

3. The driving device according to claim 1, wherein: The flexible circuit board includes a top portion close to the piezoelectric actuator and a bottom portion away from the piezoelectric actuator. The conductive member is bent from the top portion of the piezoelectric actuator and extends to the bottom portion of the flexible circuit board to provide conduction at the bottom portion of the flexible circuit board.

4. The driving device according to claim 3, wherein: The conductive part includes a main body, an extension and a welding part, the main body is located at the top of the piezoelectric actuator, the extension is bent along the second direction from the plane where the main body is located, the welding part is connected to the extension and is electrically connected to the bottom of the flexible circuit board, the plane where the main body is located is perpendicular to the plane where the flexible circuit board is located, and the plane where the extension is located is parallel to the plane where the flexible circuit board is located; wherein the second direction is perpendicular to the optical axis direction and the first direction.

5. The driving device according to claim 4, characterized in that The piezoelectric actuator includes a piezoelectric active part and a friction head connected to each other, and the friction head is in friction contact with the top of the first movable side wall; the main body is located on the top of the piezoelectric active part, and the extension part extends from both ends of the main body along the optical axis direction and then bends along the second direction.

6. The driving device according to claim 5, characterized in that The extension portion includes an extension area and an extension leg. The extension area extends from both ends of the main body along the optical axis direction, and then bends along the second direction to connect to the extension leg. The extension leg is connected to the welding portion at the bottom along the second direction. The main body, the extension area, the extension leg and the welding portion form an opening.

7. The driving device according to claim 4, characterized in that It also includes a pre-pressed part, which is arranged on the top of the piezoelectric actuator and applies a pre-pressure perpendicular to the optical axis direction to the movable part; the pre-pressed part includes a pre-pressed part main body and a pre-pressed part deformation body, and the pre-pressed part deformation body extends from both ends of the pre-pressed part main body along the optical axis direction; along the second direction, the distance from the top surface of the main body of the conductive part to the bottom surface of the pre-pressed part main body is H1, and the distance from the top surface of the extended part of the conductive part to the bottom surface of the pre-pressed part deformation body is H2, H1≤H2.

8. The driving device according to claim 4, wherein: There is a height difference between a plane where the extension portion is located and a plane where the main body portion is located, and the extension portion is connected to the main body portion via an inclined connecting portion.

9. The driving device according to claim 7, wherein: A mounting portion is provided between the pre-press body and the main body of the conductive member to increase a distance H1 from a top surface of the main body to a bottom surface of the pre-press body.

10. A camera module, characterized in that: include: The driving device according to any one of claims 1 to 9; 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; A photosensitive component is electrically connected to the flexible circuit board and is used to receive light from the optical lens.

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