Driving device and camera module thereof

Abstract

The invention discloses a driving device and a camera module thereof, and belongs to the field of camera modules. A driving device comprises a movable part, the movable part comprises a first movable side wall and a second movable side wall which are opposite, and the bottom of the first movable side wall is provided with a guide groove extending in the optical axis direction; a fixing part; a first supporting part and a second supporting part are arranged between the movable part and the fixed part; the first supporting part comprises at least two supporting balls, and the second supporting part comprises at least one supporting ball; the number of the supporting balls of the first supporting part is larger than that of the supporting balls of the second supporting part, and the supporting balls of the first supporting part are contained in the guide grooves. The piezoelectric actuator is in frictional contact with the top of the first movable side wall; and a pre-pressing piece. The driving device and the camera module provided by the invention have the advantages that the assembly is convenient, the overturning of the optical lens is prevented, and the imaging stability of the camera module is improved.

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 technological 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, and the movable carrier is prone to tilting, overturning, and even being stuck inside the base of the camera module due to uneven stress. SUMMARY

[0005] One object of the present application is to provide a driving device and a camera module thereof, which drives the top of the movable part, helps to improve the assembly consistency and contact flatness, and reduces the tilt and consistency problems caused by assembly errors.

[0006] Another object of the present application is to provide a driving device and a camera module thereof, which sets a first support part and a second support part between the movable part and the fixed part, and uses different numbers of support balls of the two support parts to solve or at least partially alleviate the problem that the movable part may be overturned, the first support part may be subjected to a large force and then slide and rub, and a pit may be generated and the movable part may be stuck due to the action of the pre-pressing part and the piezoelectric actuator on one side of the movable part.

[0007] Another object of the present application is to provide a driving device and a camera module thereof, which optimizes the contact point distribution of the supporting balls at the bottom of the movable part by setting small balls between two supporting balls, optimizes the force distribution of the movable part, reduces the sliding friction ratio, and reduces wear.

[0008] To achieve the above objects, the present application adopts the technical scheme of a driving device for a periscopic camera module, comprising: a movable part for carrying an optical lens, the optical lens defining an optical axis, the movable part comprising opposite first and second movable side walls, the bottom of the first movable side wall having a guide groove extending along the optical axis direction; a fixed part, the movable part being movably arranged in the fixed part; a first supporting part and a second supporting part are arranged between the movable part and the fixed part, the first supporting part being arranged between the bottom of the first movable side wall and the fixed part, and the second supporting part being arranged between the second movable side wall and the fixed part; the first supporting part comprises at least two supporting balls, and the second supporting part comprises at least one supporting ball; the number of supporting balls of the first supporting part is greater than the number of supporting balls of the second supporting part, and the supporting balls of the first supporting part are accommodated in the guide groove; a piezoelectric actuator in frictional contact with the top of the first movable side wall for driving the movable part to move along the optical axis direction; a pre-pressing piece arranged on the piezoelectric actuator and exerting a pre-pressing force on the first movable side wall and the first supporting part perpendicular to the optical axis direction.

[0009] As a preferred, the first supporting part comprises at least two supporting balls and at least one small ball between them, and the pre-pressing force of the pre-pressing piece acts between the connecting lines of the at least two supporting balls of the first supporting part.

[0010] As a preferred, it further comprises a pressing block fixed to the fixed part, the pressing block, the pre-pressing piece and the piezoelectric actuator being sequentially arranged at the top of the first movable side wall of the movable part along a second direction, the projection of the first supporting part along the second direction being entirely within the projection range of the pressing block along the second direction, wherein the second direction is perpendicular to the optical axis direction.

[0011] As a preferred, the piezoelectric actuator comprises a piezoelectric active part and a friction head connected to each other, the friction head is in friction contact with the first movable side wall, wherein the imaginary line of the action direction of the pre-pressing force of the pre-pressing part along the second direction passes through the piezoelectric block, the friction head and the first support part.

[0012] As a preferred, the cross-section center of the piezoelectric block, the position where the friction head acts on the first movable side wall and the cross-section center of the first support part are aligned in the second direction.

[0013] As a preferred, the first support part provides a support force along the second direction for the first movable side wall, the pre-pressing part is deformed under the action of the piezoelectric block and the first support part to generate the pre-pressing force, wherein the direction of the pre-pressing force is opposite to the direction of the support force.

[0014] As a preferred, the bottom of the second movable side wall has a support groove extending along the optical axis direction, and the second support part is accommodated in the support groove.

[0015] As a preferred, the number of the guide groove and the support groove is one, the guide groove penetrates the bottom of the first movable side wall along the optical axis direction, and the support groove penetrates at least a part of the bottom of the second movable side wall along the optical axis direction; the length of the guide groove along the optical axis direction is greater than the length of the support groove along the optical axis direction.

[0016] As a preferred, the support ball of the first support part is tightly fitted in the guide groove, and the support ball of the second support part is loosely fitted in the support groove.

[0017] As a preferred, the difference between the length of the guide groove along the optical axis direction and the minimum total length of the first support part is not less than the mechanical stroke of the movable part.

[0018] To achieve one of the purposes of the present application, the technical scheme adopted by the present application is as follows: a camera module comprises: Any one of the above driving devices; a light turning element for turning the incident light, an optical lens held on the light turning path of the light turning element; a photosensitive assembly for receiving light from the optical lens. BRIEF DESCRIPTION OF DRAWINGS

[0019] 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 below. Obviously, the drawings described below only relate to some embodiments of the present application, but not limit the present application.

[0020] Figure 1 Structure diagram of a camera module in some embodiments of the present application.

[0021] Figure 2 Structure diagram of a camera module in some embodiments of the present application.

[0022] Figure 3 Structure diagram of a camera module in some embodiments of the present application.

[0023] Figure 4 Structure diagram of a camera module in some embodiments of the present application.

[0024] Figure 5 Structure diagram of a camera module in some embodiments of the present application.

[0025] Figure 6 Structure diagram of a camera module in some embodiments of the present application.

[0026] Figure 7 Structure diagram of a camera module in some embodiments of the present application.

[0027] Figure 8 Structure diagram of a camera module in some embodiments of the present application.

[0028] Figure 9 Structure diagram of a camera module in some embodiments of the present application.

[0029] Figure 10 Structure diagram of a camera module in some embodiments of the present application.

[0030] Figure 11 Structure diagram of a camera module in some embodiments of the present application.

[0031] Figure 12 Structure diagram of a camera module in some embodiments of the present application. Figure 11 Assembly process diagram of the first support part, the second support part and the fixing part of the driving device in the embodiment shown.

[0032] Figure 13 Assembly process diagram of the first support part, the second support part and the fixing part of the driving device in the embodiment shown. Figure 11 Assembly process diagram of the movable part of the driving device in the embodiment shown.

[0033] Figure 14 Assembly process diagram of the piezoelectric actuator and the pre-pressing part of the driving device in the embodiment shown. Figure 11 Assembly process diagram of the piezoelectric actuator and the pre-pressing part of the driving device in the embodiment shown.

[0034] Figure 15 Assembly process diagram of the piezoelectric actuator and the pre-pressing part of the driving device in the embodiment shown. Figure 11The assembly process of the driving device and the pre-pressing piece in the embodiment is shown in the schematic view.

[0035] Figure 16 The schematic view of the sectional structure of the driving device in the optical axis direction in a modified embodiment of the present application is shown.

[0036] Figure 17 The schematic view of the movable part of the driving device in a modified embodiment of the present application is shown.

[0037] Figure 18 The schematic view of the structure of the driving device in a state without the fixed part in a modified embodiment of the present application is shown.

[0038] In the figure: 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; 12, fixed main body; 13, second fixed side wall; 131, first support groove; 14, conductive piece; 141, conductive part; 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 piece; 331, first connecting part; 333, second connecting part; 334, conductive part; 34, buffer piece; 40, pre-pressing piece; 41, fixed end; 411, fixed hole; 42, elastic part; 43, bending part; 44, mounting part; 50, pressing block; 51, lower pressing beam; 52, lower pressing arm; 521, lower pressing fixed platform; 522, lower pressing mounting platform; 523, first mounting plane; 524, mounting column; 500, groove; 61, first support part; 62, second support part; 601, support ball; 602, small ball; 70, magnetic attraction assembly; 71, first magnetic attraction piece; 711, base part; 712, support part; 72, second magnetic attraction piece; 80, light sensing assembly; 90, light turning element; 100, optical lens. DETAILED DESCRIPTION

[0039] In order to make the purpose, 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 in combination with the drawings showing 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 labor shall fall within the scope of protection of the present application.

[0040] ​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.

[0041] 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.

[0042] In the description of the application, it needs to be understood that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection", "attachment" 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.

[0043] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0044] As used in this specification and claims, the terms "for example" and "e.g." mean "for the purpose of example, illustration, and description," and should not be regarded as limiting.

[0045] The words "comprise," "comprising," "include," "including," and "includes" used in this specification are not

[0046] The term "and / or", within the present application, merely describes an association between associated objects, and means that there can be three types of relationships, for example, A and / or B, can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally means that the front and rear associated objects are in an "or" relationship.

[0047] According to Figures 1 to 18As shown, one or more embodiments of the present application disclose a driving device for a camera module, comprising: a movable part 20 for carrying an optical lens 100, the optical lens 100 defining an optical axis, the movable part 20 comprising opposite first and second movable side walls 21 and 23, the bottom of the first movable side wall 21 having a guide groove extending along the optical axis direction; a fixed part 10, the movable part 20 being movably arranged in the fixed part 10; first and second support parts 61 and 62 movably arranged between the movable part 20 and the fixed part 10, the first support part 61 being arranged between the bottom of the first movable side wall 21 and the fixed part 10, the second support part 62 being arranged between the second movable side wall 23 and the fixed part 10; the first support part 61 comprising at least two support balls 601, the second support part 62 comprising at least one support ball 601; the number of support balls 601 of the first support part 61 being greater than the number of support balls 601 of the second support part 62, the support balls 601 of the first support part 61 being accommodated in the guide groove; 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 optical axis direction; a pre-pressing member 40 arranged on the piezoelectric actuator 30 and exerting a pre-pressing force on the first movable side wall 21 and the first support part 61 perpendicular to the optical axis direction. Since the pre-pressing member 40 and the first support part 61 are arranged at the top and bottom of the first movable side wall 21 respectively, the pre-pressing force generated by the pre-pressing member 40 can directly act on the first support part 61. This makes the first and second support parts 61 and 62 subjected to different forces, which not only increases the risk of overturning of the movable part 20, but also increases the risk of sliding friction or even jamming of the first support part 61. Therefore, in the present application, through the cooperation of the first and second support parts 61 and 62, the piezoelectric actuator 30 and the pre-pressing member 40, more support balls 601 are arranged in the first support part 61 on the same side as the piezoelectric actuator 30 and the pre-pressing member 40, and fewer support balls 601 are arranged in the second support part 62 on the opposite side of the piezoelectric actuator 30 and the pre-pressing member 40. In this way, a larger support area can be provided on the side where the pre-pressing force is generated by the pre-pressing member 40, reducing the risk of overturning; and the direct action of the pre-pressing force can be dispersed by the larger number of support balls 601 in the first support part 61, reducing the risk of sliding friction or even jamming of the first support part 61.

[0048] The application sets the piezoelectric actuator 30 and the pre-pressing part 40 on the top of the first movable side wall 21 of the movable part 20, and sets the first support part 61 and the second support part 62 between the fixed part 10 and the bottom of the movable part 20, so that the movable part 20 can move stably along the optical axis direction under the driving of the piezoelectric actuator 30. The first support part 61 arranged on the same side of the piezoelectric actuator 30 includes at least two support balls 601, and the second support part 62 arranged on the opposite side of the piezoelectric actuator 30 includes at least one support ball 601. The piezoelectric actuator 30 and the first support part 61 are arranged on the upper and lower sides of the first movable side wall 21 of the movable part 20 respectively, so as to ensure that the first movable side wall 21 is subjected to downward pre-pressing force and upward supporting force at the same time, and avoid the tilting of the movable part 20 due to uneven force on the first movable side wall 21.

[0049] The number of the support balls 601 of the first support part 61 is greater than that of the support balls 601 of the second support part 62, so as to provide sufficient supporting force for the first movable side wall 21. Meanwhile, at least two support balls 601 of the first support part 61 and at least one support ball 601 of the second support part 62 are distributed on both sides of the bottom of the movable part 20 relative to the optical axis direction, so as to form at least one triangular effective supporting surface and provide larger supporting area on the same side of the piezoelectric actuator 30, thereby providing more stable support for the movable part 20 and preventing the tilting or jamming of the movable part 20 during driving due to uneven force on one side.

[0050] Further, the first support part 61 includes at least two support balls 601 and at least one small ball 602 between the two support balls 601, and the pre-pressing force acts between the connecting lines of the at least two support balls 601 of the first support part 61.

[0051] The arrangement of the small ball 602 increases the supporting area on the same side of the piezoelectric actuator 30 by adjusting the spacing of the at least two support balls 601, so as to cover the action range of the pre-pressing force as much as possible, thereby reducing the risk of overturning of the movable part 20 during driving and improving the stability of the driving device. Further, the distribution of the contact points of the support balls 601 at the bottom of the movable part 20 is optimized, and the small ball 602 can disperse the impact force when the driving device falls or collides, so as to avoid the concave pits of the support balls 601 due to concentrated force and improve the reliability of the driving device. The at least one small ball 602 and the at least two support balls 601 form a support part, the rolling of the small ball 602 improves the probability of rolling movement of the at least two support balls 601, reduces the friction, improves the driving efficiency, further reduces the risk of jamming of the support balls 601, and improves the stability of the driving device.

[0052] AsFigure 1 As shown, the optical lens 100 defines an optical axis, which is perpendicular to a first direction and a second direction. Specifically, the first direction defines a width direction of the periscopic camera module arranged along the Y axis, the second direction defines a height direction of the periscopic camera module arranged along the Z axis, and the optical axis direction defines a 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 herein.

[0053] In the pre-pressing driving structure of the periscopic camera module, the pre-pressing driving structure of the driving device includes a piezoelectric actuator 30, a pre-pressing piece 40, and a pressing block 50. The piezoelectric actuator 30 is arranged on the top of at least a portion of the movable part 20 along the second direction. At least a portion of the pre-pressing piece 40 is clamped between the piezoelectric actuator 30 and the pressing block 50 along the second direction. The pressing block 50 controls the deformation of the pre-pressing piece 40 to generate a pre-pressing force along the second direction. The piezoelectric actuator 30 and the movable part 20 abut under the action of the pre-pressing force. The pre-pressing piece 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-pressing piece 40, and then the pressing block 50 is designed to be mounted on the fixed part 10 from the top to assemble the periscopic camera module, which helps to simplify the assembly process of the periscopic camera module, further reduces the inclination of the movable part 20 and the poor consistency of the periscopic camera module caused by assembly errors, and improves the imaging stability of the periscopic camera module. Further, the pressing block 50 can also adjust the deformation degree of the pre-pressing piece 40 to adjust the size of the pre-pressing force, thereby improving the performance of the driving device. Furthermore, the pressing block 50 can also protect the pre-pressing piece 40, avoiding interference between the pre-pressing piece 40 and other components in the driving device during the deformation process, thereby affecting the performance of the pre-pressing piece 40.

[0054] Reference Figure 2 , Figure 3 and Figure 11 It can be known that, in some embodiments of the piezoelectric actuator 30 of the periscopic camera module, the piezoelectric actuator 30 includes a piezoelectric active part 31 and a friction head 32 connected with each other. Due to the pre-pressing force of the pre-pressing piece 40 applied to 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 is beneficial to drive the movable part 20 to move along the optical axis direction after the piezoelectric active part 31 receives the voltage, reduces the shaking of the optical lens 100 during the driving process and the inclination caused thereby, and further improves the imaging accuracy and imaging stability of the periscopic camera module during automatic focusing. Specifically, the friction head 32 maintains frictional contact with the first movable side wall 21.

[0055] It can be understood that by keeping the movable part 20 and the friction head 32 in mutual abutment, 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 in the focusing process. Further, while improving the driving force provided by the piezoelectric actuator 30, the stability of the camera module is enhanced, image jitter is reduced, and imaging quality is improved.

[0056] Wherein the acting direction of the pre-pressing force of the pressing block 50, the pre-pressing piece 40, the friction head 32 and the first supporting part 61 along the second direction passes through the imaginary line, which ensures that the acting area of the movable part 20 under the pre-pressing force and the support of the first supporting part 61 is as concentrated as possible in the same direction on the first movable side wall, so as to reduce the overturning moment and maintain the stability of the movement of the movable part 20.

[0057] Further, the cross-sectional center of the pressing block 50, the position where the friction head 32 acts on the movable part 20 and the cross-sectional center of the first supporting part 61 are aligned in the second direction, which improves the targeting of the supporting force to more accurately reduce the overturning moment. Specifically, the cross-sectional center of the pressing block 50, the position where the friction head 32 acts on the first movable side wall 21 and the cross-sectional center of the first supporting part 61 are aligned in the second direction.

[0058] In some embodiments, the part of the movable part 20 abutting the friction head 32 is disposed on the same side as the pressing block 50, as shown in Figure 7 As shown, the side of the movable part 20 adjacent to the piezoelectric actuator 30 extends along the width direction (first direction Y-axis) towards the inner side wall of the fixed part 10 where the piezoelectric actuator 30 is mounted, and the part of the movable part 20 abutting the friction head 32, the friction head 32, the piezoelectric active part 31 and the pressing block 50 are sequentially distributed in the side wall of the fixed part 10 along the height direction (second direction Z-axis), so as to improve the compactness of the side structure distribution and to a certain extent ensure that the pre-pressing force downward along the second direction is perpendicular to the friction surface (XY interface) between the movable part 20 and the friction head 32, so as to as far as possible improve the actuation effect of the pre-pressing force and improve the driving efficiency.

[0059] Reference Figure 5 With Figure 6It can be known that, in some embodiments, the fixed part 10 is provided with a first accommodating groove 112 and a second accommodating groove 113, which are opened on the same side of the fixed body 12 along the second direction, the first accommodating groove 112 is communicatively located at the upper part of the second accommodating groove 113, the pressing block 50 is arranged in the first accommodating groove 112, and one side of the movable part 20 is accommodated in the second accommodating groove 113, wherein the size of the first accommodating groove 112 along the optical axis direction is greater than the size of the second accommodating groove 113 along the optical axis direction.

[0060] Specifically, since the length dimension of the first accommodating groove 112 along the optical axis direction is greater than the length dimension of the second accommodating groove 113 along the optical axis direction, the pressing block 50 accommodated in the first accommodating groove 112 can be fixed to the fixed part 10, further increasing the stability and reliability of the pressing block 50.

[0061] 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 piece 40 and the piezoelectric actuator 30 are sequentially arranged between the pressing block 50 and the movable part 20, so that the structure is more compact, and the space utilization rate inside the camera module is increased.

[0062] 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 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.

[0063] In an embodiment of supporting the movable part 20 in the present application, 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 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.

[0064] 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, the pressing block 50 is fixed to the fixed part 10, 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 a support 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 is not fixed to the fixed part 10, 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, and further causing the pre-pressing part 40 to be unable to deform and generate a pre-pressing force, thereby affecting the driving. In order to avoid the above situation, the pressing block 50 is fixedly connected to the fixed part 10 in the present application, and thus 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, the pre-pressing part 40 and the pressing block 50 can be prevented from being separated; on the other hand, the deformation of the pre-pressing part 40 can be maintained, 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 support force, and the direction of the pre-pressing force is opposite to the direction of the support 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, the risk of overturning of the movable part 20 may be increased. Therefore, in order to maintain the force balance of the movable part 20, the first support part 61 provides a support force opposite to the direction of the pre-pressing force to the movable part 20 to balance the pre-pressing force, thereby reducing the risk of overturning of the movable part 20.

[0065] In some embodiments, the pre-pressing part 40 deforms under the action of the pressing block 50 and the first support part 61 to generate a pre-pressing force, and the direction of the pre-pressing force is the same as the direction of the downward pressing force. Due to the action of the pre-pressing force, the friction head 32 and the movable part 20 are always kept in frictional contact, which is beneficial to the piezoelectric actuator 30 to generate stable driving force.

[0066] The size of the pressing block 50 in the optical axis direction is greater than the size of the first support part 61 in the optical axis direction, and in the optical axis direction, the projection of the first support part 61 in the second direction is entirely within the projection range of the pressing block 50 in the second direction, so that the force acting on the plurality of support parts in the first support part 61 is more uniform. The second direction is perpendicular to the optical axis direction. Further, the first support part 61 is accommodated in the guide groove, and the size of the pressing block 50 in the optical axis direction is also greater than the size of the guide groove in the optical axis direction, and in the optical axis direction, the projection of the guide groove in the second direction is entirely within the projection range of the pressing block 50 in the second direction, so that even if the position of the first support part 61 in the guide groove changes, in the optical axis direction, the projection of the first support part 61 in the second direction can always be entirely within the projection range of the pressing block 50 in the second direction. As described above, the pressing block 50 can provide a deformation space for the pre-pressing piece 40, maintain the deformation of the pre-pressing piece 40, and also adjust the size of the pre-pressing force generated by the pre-pressing piece 40. Since the first support part 61 is located on the same side as the pressing block 50 and the pre-pressing piece 40 relative to the optical axis, this makes the pre-pressing force more directly act on the first support part 61, and the adjustment of the pre-pressing force by the pressing block 50 can also directly act on the first support part 61. By the projection of the first support part 61 in the second direction being entirely within the projection range of the pressing block 50 in the second direction, on the one hand, the pre-pressing piece 40 and the first support part 61 are closely matched in spatial position by the pressing block 50 to generate pre-pressing force and support force; on the other hand, during the driving process, the first support part 61 is always within the range of the pressing block 50, 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 plurality of support parts of the first support part 61, so that the force acting on a single support part is more uniform, and especially when falling or impact occurs, the plurality of support parts can disperse the impact force to reduce the risk of the first support part 61 generating a pit, 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.

[0067] 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 located at 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. Among them, 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 second fixed side wall 13.

[0068] In some embodiments of the support part assembled in the present application, the first support part 61 is tightly clamped between the first fixed side wall 11 of the fixed part 10 and the first movable side wall 21 of the movable part 20, and the second support part 62 is loosely clamped between the second fixed side wall 13 of the fixed part 10 and the second movable side wall 23 of the movable part 20.

[0069] 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, 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 second support part 62 is arranged to improve the parallelism of the movable part 20 during movement, further improve the stability of the optical lens 100, and enhance the imaging quality of the camera module.

[0070] 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.

[0071] 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.

[0072] Furthermore, when the movable part 20 is driven to move along the optical axis, the main supporting component is the first support part 61. The straight-line distance from the contact point between the friction head 32 and the movable part 20 to the first support part 61 is less than the straight-line distance from the contact point between the friction head 32 and the movable part 20 to the second support part 62. Since the first support part 61 adopts a tight-fit assembly method, the straight-line distance from the contact point between the friction head 32 and the movable part 20 to the first support part 61 is the lever arm value corresponding to the overturning moment of the movable part 20. By reducing the lever arm value, the overturning moment value is further reduced, thereby avoiding the risk of the movable part 20 tilting. Furthermore, the above-mentioned tight-fit and loose-fit assembly methods can be considered through the tolerance values ​​in the assembly process. For example, the tolerance between the first support part 61 and the movable part 20 and the fixed part 10 is small, for example, 0.01, while the tolerance between the second support part 62 and the movable part 20 and the fixed part 10 is large, for example, 0.02. When the movable part 20 is not tilted, the first support part 61 provides support for it. Only when the movable part 20 tilts will the second support part 62 provide support to straighten it. This reduces the likelihood of the movable part 20 tilting and helps improve the imaging quality of the camera module.

[0073] refer to Figure 2 , Figure 7 and Figure 11 As shown, the movable part 20 includes a first movable sidewall 21 and a second movable sidewall 23 facing each other. The first movable sidewall 21 and the second movable sidewall 23 are arranged opposite each other along a first direction. The first movable sidewall 21 is provided with a friction part 22. At least one pair of guide grooves extending along the optical axis are provided between the bottom of the first movable sidewall 21 and the first fixed sidewall 11. The pair of guide grooves are arranged opposite each other along a second direction. The first support part 61 is accommodated between the pair of guide grooves, such that the bottom surface of the first movable sidewall 21 abuts against the first support part 61. The friction part 22 is mounted on the top surface of the first movable sidewall 21 and abuts against the friction head 32 of the piezoelectric actuator 30. The first movable sidewall 21 is accommodated in the second receiving groove 113. The bottom of the second movable sidewall 23 has a support groove extending along the optical axis, and the second support part 62 is accommodated in the support groove. Specifically, the bottom of the second movable sidewall 23 and the second fixed sidewall 13 have support grooves extending along at least one pair of optical axes. These support grooves are arranged opposite each other along a second direction, and the second support portion 62 is installed between these support grooves, such that the bottom surface of the second movable sidewall 23 abuts against the second support portion 62. This application increases the stability of the camera module by assembling the support portion within the guide groove and the support groove, thus stably clamping the support portion between the movable portion 20 and the fixed portion 10.

[0074] In some embodiments of the present application, the guide slot includes a first guide slot 111 located at the first fixed side wall 11 and a second guide slot 211 located at the first movable side wall 21, and the first support portion 61 is arranged between the first guide slot 111 and the second guide slot 211. Similarly, the support slot includes a first support slot 131 located at the second fixed side wall 13 and a second support slot 231 located at the second movable side wall 23, and the second support portion 62 is arranged between the first support slot 131 and the second support slot 231.

[0075] The fixed portion 10 further includes a first fixed side wall 11, a second fixed side wall 13, and a fixed body 12, and the first fixed side wall 11 and the second fixed side wall 13 are arranged opposite to each other on both sides of the fixed body 12 along the second direction. The first receiving slot 112 and the second receiving slot 113 are opened 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 the first guide slot 111 and the first support slot 131 are arranged at the first fixed side wall 11 and the second fixed side wall 13, respectively. Among them, the first support portion 61 is installed in the first guide slot 111 and supports the first movable side wall 21 of the movable portion 20, the second support portion 62 is installed in the first support slot 131 and supports the second movable side wall 23 of the movable portion 20, and the arrangement of the first support portion 61 and the second support portion 62 reduces the frictional resistance force when the movable portion 20 is driven to move, which is beneficial to improve the driving performance in the camera module. The first guide slot 111 and the first support slot 131 are arranged flush on both sides of the fixed portion 10 along the first direction, so that the first support portion 61 and the second support portion 62 are arranged flush along the first direction, providing a smooth support for the movable portion 20. Further, as shown in Figure 4 、 Figure 16 and Figure 18 Since the piezoelectric actuator 30 drives the movable portion 20 on the top side of the movable portion 20, the first support portion 61 and the second support portion 62 can be arranged flush on the bottom of the movable portion 20 to provide stable support for the movable portion 20, further improving the smoothness of the movable portion 20 when driven along the optical axis direction. In other words, when the piezoelectric actuator 30 drives the movable portion 20, the support portion is arranged on the opposite side of the movable portion 20 where the piezoelectric actuator 30 is arranged, so that the movable portion 20 is clamped between the piezoelectric actuator 30 and the support portion, to avoid the phenomenon that the piezoelectric actuator 30 causes the movable portion 20 to tilt during driving. Further, no additional support portion is arranged on the side or top of the movable portion 20, thereby reducing the number of support portions in the camera module, optimizing the assembly process, further reducing the assembly tolerance and increasing the assembly consistency.

[0076] Specifically, since the movable part 20 moves along the optical axis direction, the first support part 61 and the second support part 62 are arranged between the movable part 20 and the fixed part 10 to support the self-gravity of the movable part 20. In order to further maintain the stability of the optical lens 100, the first support part 61 and the second support part 62 are arranged as much as possible on both sides of the bottom of the movable part 20 relative to the optical axis in the first direction, so as to provide the movable part 20 with as symmetrical support force as possible, thereby reducing the risk of tilting of the movable part 20.

[0077] 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 along the optical axis direction does not need to be increased, in other words, the length of the second movable side wall 23 along the optical axis direction can be smaller than the length of the first movable side wall 21 along 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 utilization of the camera module more reasonable, because the piezoelectric actuator 30 and the pre-pressing piece 40 both extend along the optical axis direction, and the first movable side wall 21 of the movable part 20 corresponding thereto also needs to extend along 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, which can also have longer 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 is not 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 the compactness of the lens driving device structure can 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 the stable support of the first support part 61 and the second support part 62 to the movable part 20 in the long stroke. Since the optical focusing stroke in the camera module is large, this design is helpful to ensure that the support part always effectively supports the movable part 20 in the long stroke.

[0078] As Figure 8As shown, in some embodiments, the first support portion 61 and the second support portion 62 are each at least two support portions spaced apart along the optical axis. The distance between the at least two support portions of the first support portion 61 is greater than the distance between the at least two support portions of the second support portion 62. It is understood that the first support portion 61 is assembled inside the second guide groove 211, and the second support portion 62 is assembled inside the second support groove 231. As described above, the length of the second movable sidewall 23 along the optical axis can be less than the length of the first movable sidewall 21 along the optical axis to provide sufficient movement space for the first support portion 61 and the second support portion 62. The support portion can be implemented as a ball bearing or a slider.

[0079] In some embodiments, the movable part 20 and / or the fixed part 10 are provided with a guide structure suitable for mounting the support, such as a guide groove or guide rail structure. Since the support is arranged along the optical axis, it facilitates guiding the movable part 20 to move along the optical axis. It is understood that a metal insert is provided on the inner side of the guide groove or guide rail, which helps to reduce wear on the support when it moves inside the guide groove or guide rail, reduces the risk of the support getting stuck during use, and further improves the quality and lifespan of the camera module.

[0080] In some embodiments, the first support portion 61 can be implemented as a plurality of support portions arranged sequentially 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 or sliding state—increasing the number of support portions can compensate for the mutual motion states between the support portions. Further, the second support portion 62 can be implemented as a plurality of support portions arranged sequentially along the optical axis, so that the opposite sides of the movable portion 20 receive balanced support. Specifically, the first support portion 61 includes at least three support portions, and the second support portion 62 includes at least three support portions.

[0081] like Figure 8 As shown, in some embodiments, two second guide grooves 211 are spaced apart on the bottom surface of the first movable sidewall 21 along the optical axis, and two second support grooves 231 are spaced apart on the bottom surface of the second movable sidewall 23 along the optical axis. The distance between the farthest endpoints of the two second guide grooves 211 is greater than the distance between the farthest endpoints of the two second support grooves 231.

[0082] Due to the pre-pressure, the friction head 32 drives the friction part 22 on the first movable sidewall 21. By increasing the length of the first movable sidewall 21 along the optical axis, the length of the friction part 22 on the first movable sidewall 21 along the optical axis is increased, thereby increasing the travel of the movable part 20. Furthermore, the piezoelectric actuator 30 and the first support part 61 are co-located on the first movable sidewall 21. Since both the piezoelectric actuator 30 and the pre-pressure 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, thus providing more space on the bottom side of the first movable sidewall 21 to accommodate the first support part 61. To further improve the structural balance, the distance between the first support parts 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, etc.

[0083] In some embodiments, two second guide grooves 211 are spaced apart along the optical axis on the bottom surface of the first movable sidewall 21, suitable for the first support 61 to be installed between the first guide groove 111 and the second guide groove 211, and two second support grooves 231 are spaced apart along the optical axis on the bottom surface of the second movable sidewall 23, suitable for the second support 62 to be installed between the first support groove 131 and the second support groove 231, which helps to improve the installation stability of the support and optimize the assembly process.

[0084] Furthermore, since the support structure is assembled inside the guide groove or support groove structure, 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 making the support area formed by the line connecting the first support part 61 and the second support part 62 larger, thereby reducing the risk of the movable part 20 tilting during movement.

[0085] In some embodiments, such as Figure 6 As shown, along the second direction, the projection of the friction part 22 overlaps with the line connecting the projections of the farthest endpoints of the two second guide grooves 211, and the projection of the friction part 22 overlaps with the line connecting the projections of the two support parts of the first support part 61. This helps to suppress the risk of the movable part 20 tipping over in the left-right and front-back directions. 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 a stable support force is provided throughout the entire movement stroke of the movable part 20, reducing the possibility of the movable part 20 tipping over in the front-back direction. In other words, the length of the friction part 22 along the optical axis is less than the distance between the farthest endpoints of the two second guide grooves 211 along the optical axis.

[0086] In some embodiments, the first support part 61 and the second support part 62 respectively include two ball bearings for providing a stable support force to the movable part 20. Further, each ball bearing is arranged in a single guide groove so as to avoid interference between the two ball bearings. It can be understood that the greater the distance between the two ball bearings of the first support part 61 and the second support part 62 arranged along the optical axis direction, the more stable the support force provided to the movable part 20, and the further enhanced stability and reliability of the optical lens 100. When the distance between the two ball bearings of the first support part 61 is greater than the distance between the two ball bearings of the second support part 62, the support surface area formed by the support parts is increased, and the stability of the optical lens 100 is increased.

[0087] In some embodiments, the projection of the friction head 32 of the piezoelectric actuator 30 along the second direction and the projection of the line between the first support part 61 along the second direction overlap each other, further reducing the overturning moment value and reducing the risk of the movable part 20 being overturned.

[0088] In some embodiments, the number of the friction head 32 of the piezoelectric actuator 30 is two, and the two friction heads 32 are arranged at intervals along the optical axis direction on the piezoelectric active part 31. 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 uniformly distributed on the two support parts of the first support part 61, and reducing the wear and damage of the first support part 61 due to uneven pre-pressing force. Further, when the piezoelectric active part 31 causes the friction head 32 to move by generating vibration deformation, the angle between the friction head 32 and the 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. The direction of the force can have a certain inclination angle relative to the plane in which the first movable side wall 21 of the movable part 20 is located. At this time, the movable part 20 can further tilt due to the action of the inclined force. Therefore, the greater the distance between the two support parts of the first support part 61, the greater the support area provided to the movable part 20, thereby reducing the overturning moment value and further reducing the risk of the movable part 20 tilting.

[0089] In some embodiments, the imaginary line of the direction of the pre-pressing force acting on the movable part 20 intersects the 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 tilting.

[0090] In some embodiments, the position where the friction head 32 of the piezoelectric actuator 30 acts on the first movable side wall 21 is aligned with the cross-sectional center of the first supporting part 61 in the second direction. This arrangement is conducive to the pre-pressing force exerted by the pre-pressing member 40 being directly and stably applied to the first supporting part 61, increasing the stability of the pre-pressing force transmission and thus reducing errors caused by misalignment of components, thereby improving the reliability of the camera module. Furthermore, this alignment helps to reduce local over-wear of the first supporting part 61, prolonging the service life of the camera module while reducing the overturning moment value and further reducing the risk of tilting of the optical lens 100.

[0091] In some embodiments, with reference to Figures 8 to 10 The first supporting part 61 and the second supporting part 62 are independent components that can be formed separately from the movable part 20 and the pressing block 50. Furthermore, the first supporting part 61 can be a multi-point structure, such as a ball bearing or a sliding block, arranged along the optical axis direction. The second supporting part 62 can be a multi-point structure or a guide rail structure, such as a ball bearing, a sliding block, or a guide rod, arranged along the optical axis direction. When a guide rod is used as a supporting part, it has good linearity, which can increase the stability and reliability of the movable part 20 when being driven to move, and further reduce the tilting or overturning of the optical lens 100. Specifically, the second supporting groove 231 equipped with the second supporting part 62 can be trapezoidal, rectangular, or V-shaped, etc.

[0092] It can be understood that when the first supporting part 61 uses a ball bearing as a supporting structure and the second supporting part 62 uses a guide rod as a supporting structure, the downward pressure on the second supporting part 62 is mainly the magnetic attraction force provided by the magnetic attraction assembly 70, which is less than the pressure on the first supporting part 61, which includes the magnetic attraction force provided by the magnetic attraction assembly 70 and the pre-pressing force provided by the pre-pressing member 40. In this way, the friction force generated by the surface contact of the second supporting part 62 can be reduced, thereby reducing the power consumption of the piezoelectric actuator 30. On the other hand, if the first supporting part 61 uses a guide rod as a supporting structure, the guide rod structure with a large friction coefficient will generate a large friction force due to surface contact, which will affect the driving effect of the piezoelectric actuator 30. It can be understood that when a ball bearing is used as a supporting part structure, the ball bearing and the guide rail and guide groove use point contact, which has the smallest rolling friction and the largest sliding friction, which is conducive to the driving of the movable part 20.

[0093] In some embodiments, the first support part 61 and the second support part 62 are arranged as a hemispherical structure fixed to the fixed part 10 and / or the movable part 20, which can also be a boss, using point contact friction, which is beneficial to reduce the wear of the guide groove or guide rail structure, prolonging the service life of the camera module.

[0094] As previously described, 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 as 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 coordinated action of the asymmetric ball layout and the driving position of the piezoelectric actuator 30, to reduce the risk of overturning of the driving device, and also to reduce the risk of ball indentation or jamming, thereby improving the reliability and stability of the driving device.

[0095] Since the piezoelectric actuator 30 drives at the top of the first movable side wall 21, the pre-pressing piece 40 generates a pre-pressing force parallel to the second direction, which points to the first support part 61 on the same side as the piezoelectric actuator 30. The pressing block 50 is located at the top of the pre-pressing piece 40, which can adjust the pre-pressing force, in this case the first support part 61 is subjected to a greater force than the second support part 62 on the opposite side of the piezoelectric actuator 30, and the movable part 20 is subjected to uneven stress at the first movable side wall 21 and the second movable side wall 23, which has the risk of overturning, thereby affecting the stability and reliability of the driving device.

[0096] To solve the above problems, as shown in Figure 11 , Figures 16 to 18 In the present application, more support balls 601 are arranged in the first support part 61, which can significantly increase the effective support area on the same side as the piezoelectric actuator 30, providing more stable support for the movable part 20, preventing the movable part 20 from tilting or jamming during driving; on the other hand, more support balls 601 can cooperate to share the pre-pressing force, reduce the local pressure of a single support ball 601, and reduce the risk of indentation of the support ball 601. Especially in the case of falling or impact, the increase in the number of support balls 601 can significantly inhibit the formation of indentations on the contact surface by dispersing the impact force, ensuring the reliability and stability of the driving device during long-term movement.

[0097] Further, if the number of the support balls 601 of the first support part 61 is increased and the length of the ball groove is not enough, the moving space of the support balls 601 in the single groove will be small, and the support balls 601 will slide or be stuck in the groove, which cannot meet the long stroke moving requirement. Therefore, a through guide groove is arranged at the bottom of the first movable side wall 21 to increase the length of the guide groove, thereby increasing the moving space of the first support part 61, increasing the flexibility of the support balls 601, and reducing the risk of sliding friction and sticking.

[0098] Further, the first support part 61 is arranged to have different size balls, which can disperse the pressure through the small balls 602 when falling, avoid the large balls from producing pits, and keep the large balls rolling through the small balls 602, reduce the risk of sliding friction and sticking, and improve the reliability of the driving device.

[0099] In some embodiments of the support part of the application, the first support part 61 is implemented to include at least two support balls 601 and at least one small ball 602 between the two support balls 601, the second support part 62 is implemented to be at least one support ball 601, and the pre-pressing force of the pre-pressing part 40 acts on the line connecting the at least two support balls 601 of the first support part 61, so as to ensure that the support provided by the first support part 61 can reduce the moment offset.

[0100] Among them, the sizes of all the support balls 601 are consistent, and the size of the small ball 602 is smaller than that of the support ball 601. In this way, on the one hand, all the support balls 601 can form at least one triangular support surface, effectively reducing the moment offset caused by unilateral pre-pressing, reducing the deflection trend of the movable part 20 during movement, preventing sticking or vibration, and being beneficial to realize the dynamic balance of the movable part 20 during driving. On the other hand, the rolling of at least one small ball 602 increases the probability of rolling movement of the support balls 601, reduces the friction, improves the driving efficiency, further reduces the risk of sticking of the support balls 601, and improves the stability and reliability of the driving device.

[0101] As Figure 11 , Figure 16 and Figure 17As shown, the first support part 61 is implemented to include two support balls 601 at the head and tail and a plurality of small balls 602 between the two support balls 601, and the second support part 62 is implemented as one support ball 601. Three support balls 601 provide a support contact point at the bottom of the movable part 20, and three support balls 601 form a triangular effective support surface with the least number of support balls 601, improving the stability of the support. Among them, in the first support part 61 at the bottom of the first movable side wall 21, a plurality of small balls 602 fill the gap between the two support balls 601 along the optical axis direction, extend the side support area, adjust the distance between the two support contact points to optimize the contact point distribution, and improve the motion state of the two support balls 601 during driving, reduce sliding wear, and improve the stability of the driving device. When the driving device falls or collides, the small balls 602 can disperse the impact force to avoid the support balls 601 from being dented due to force concentration, thereby improving the reliability of the driving device.

[0102] When the balls are assembled between the movable part 20 and the fixed part 10, the motion state of the balls is uncertain, and the balls can randomly switch between rolling and sliding motion states. Therefore, during the movement of the movable part 20, there is a certain probability that the balls will be stuck in the ball grooves they contact, which can also cause the movable part 20 to tilt or even overturn. In the support part formed by a plurality of balls on the same side, the balls are in point contact with the fixed part 10 and the movable part 20 on both sides. If the movable part 20 tilts, one of the balls in the support part may not be in contact with the fixed part 10 and the movable part 20 at the same time, which can cause the movable part 20 and the balls to be stuck together, the movable part 20 and the balls to be separated, and other situations, thereby preventing the movable part 20 from moving further. On this basis, considering the size of the movable space at the ball assembly, the manufacturing tolerances of the fixed part 10 and the movable part 20, and the assembly tolerances between the two, the movable part 20 can also tilt or be stuck.

[0103] The first support part 61 of the present application is arranged on the same side as the piezoelectric actuator 30, wherein the first and last support balls 601 guide all the balls of the first support part 61 to move along the optical axis direction, and the plurality of small balls 602 fill the gap between the first and last support balls 601 along the optical axis direction. By adjusting the contact point position, it is ensured that the first and last support balls 601 are always in the ideal contact support position, thereby enhancing the support density of the first movable side wall 21 driven by pre-pressing. At the same time, the movement state of the first and last support balls 601 is improved to some extent, the sliding friction is reduced, the movement resistance of the first and last support balls 601 is reduced, and the smoothness of the movement of the movable part 20 is improved. In addition, the ball arrangement of the first support part 61 can buffer high-frequency vibration, reduce the instantaneous impact load of the first and last support balls 601, reduce wear, and prolong the service life.

[0104] Further, the first support part 61 is tightly clamped between the bottom of the first movable side wall 21 of the movable part 20 and the first fixed side wall 11 of the fixed part 10, and the second support part 62 is loosely clamped between the bottom of the second movable side wall 23 of the movable part 20 and the second fixed side wall 13 of the fixed part 10, i.e. the first and last support balls 601 on the same side as the piezoelectric actuator 30 are tightly clamped between the bottom of the first movable side wall 21 of the movable part 20 and the first fixed side wall 11 of the fixed part 10, and the support balls 601 on the opposite side of the piezoelectric actuator 30 are loosely clamped between the bottom of the second movable side wall 23 of the movable part 20 and the second fixed side wall 13 of the fixed part 10. On the basis of the tight clamping of the first support part 61 on the first movable side wall 21, the single loosely clamped support ball 601 on the second movable side wall 23 provides support on this side, while maintaining the basic support function, reducing the excessive constraint on this side, and avoiding the movable part 20 from being stuck during movement.

[0105] It should be appreciated that the support balls 601 of the first support portion 61 and the support balls 601 of the second support portion 62 can also adopt the tight fit and loose fit structures as described above. Such a support arrangement makes the straight-line distance from the contact point of the friction head 32 with the movable portion 20 to the tightly fitted support ball 601 smaller than the straight-line distance from the contact point of the friction head 32 with the movable portion 20 to the loosely fitted support ball 601. Since the support balls 601 of the first support portion 61 are tightly fitted, the straight-line distance from the contact point of the friction head 32 with the movable portion 20 to the support balls 601 of the first support portion 61 is the force arm x corresponding to the overturning moment of the movable portion 20. By reducing the value of x, the value of the overturning moment M is reduced, thereby avoiding the problem of tilting or even jamming of the movable portion 20. Since the first support portion 61 is located at the bottom of the first movable side wall 21 and the piezoelectric actuator 30 is located at the top of the first movable side wall 21, when the support balls 601 of the first support portion 61 are tightly fitted, the straight-line distance from the contact point of the friction head 32 with the movable portion 20 to the first support portion 61 is the force arm value corresponding to the overturning moment of the movable portion 20. Compared to a single ball placed in a ball groove, when multiple support balls 601 of the first support portion 61 are arranged in a guide groove, the contact points with the movable portion 20 will form a more dense distribution along the optical axis direction. The straight-line distance from the contact point of the friction head 32 with the movable portion 20 to the nearest support point of the first support portion 61 (i.e., the overturning force arm value) is significantly shortened, which can further reduce the risk of overturning of the movable portion 20.

[0106] wherein the size of the small balls 602 is smaller than that of the support balls 601, and there is a certain height gap between the small balls 602 and the inner wall of the ball groove accommodating the first support portion 61 in the height direction, forming a buffer space for processing or assembly errors, thereby avoiding an increase in moving resistance due to tolerances.

[0107] In some embodiments, the second support portion 62 arranged on the opposite side of the piezoelectric actuator 30 is implemented by two support balls 601 and multiple small balls 602 arranged between the two support balls 601, wherein the total length of all the balls of the second support portion 62 is smaller than the total length of all the balls of the first support portion 61, so as to form a larger effective support surface to provide more stable support for the movable portion 20 in a driving device with large unilateral pre-pressure.

[0108] In some embodiments of the guide groove and support groove of this application, the number of guide grooves and support grooves is one. The guide groove penetrates the bottom of the first movable sidewall 21 along the optical axis, and the support groove penetrates at least a portion of the bottom of the second movable sidewall 23 along the optical axis. The length of the guide groove along the optical axis is greater than the length of the support groove along the optical axis. Specifically, the first movable sidewall 21 is provided with one second guide groove 211, and the second movable sidewall 23 is provided with one second support groove 231. The first guide groove 111 penetrates the bottom of the first movable sidewall 21 along the optical axis, and the first support groove 131 penetrates at least a portion of the bottom of the second movable sidewall 23 along the optical axis. The length of the second guide groove 211 along the optical axis is greater than the length of the second support groove 231 along the optical axis. It should be understood that the second guide groove 211 has a large length along the optical axis, which can accommodate a larger number of support balls 601 of the first support part 61, thereby making the support area formed by the line connecting the first support part 61 and the second support part 62 larger, thus reducing the risk of the movable part 20 tilting during the movement.

[0109] Furthermore, in this modified embodiment, such as Figure 16 As shown, viewed along the second direction, the projections of the friction heads 32 of the piezoelectric actuator 30 all fall on the second guide groove 211 along the optical axis. Furthermore, viewed along the second direction, the projections of the friction heads 32 of the piezoelectric actuator 30 all fall on the first support portion 61 along the optical axis. This reduces the risk of the moving part 20 tipping over and also helps to evenly distribute the preload on the first support portion 61, reducing wear and damage to the first support portion 61 caused by uneven preload. More specifically, the piezoelectric actuator 30 has two friction heads 32, which are spaced apart along the optical axis on the piezoelectric active part 31. The distance between the two friction heads 32 can be greater than the dimension of any one of the first support portions 61 in the optical axis direction. Along the second direction, the projections of both friction heads 32 all fall on the first support portion 61 along the optical axis. Therefore, in some cases, along the second direction, the projections of all the friction heads 32 of the piezoelectric actuator 30 all fall on the first support portion 61 along the optical axis.

[0110] Based on the foregoing, it can be seen that the length of the first movable sidewall 21 is greater than the length of the second movable sidewall 23 because the piezoelectric actuator 30 is mounted on the first movable sidewall 21, which can accommodate a larger travel stroke. Similarly, the guide groove is longer than the support groove, so that the ball bearings on the same side as the piezoelectric actuator 30 can move in a longer space, resulting in a larger support area, higher flexibility, and better reliability and stability.

[0111] Specifically, the number of the first guide groove 111, the second guide groove 211, the first support groove 131 and the second support groove 231 is one, and the plurality of balls constituting a support part are arranged in one groove.

[0112] In some embodiments of the present application, the support ball 601 of the first support part 61 is tightly fitted in the guide groove, and the support ball 601 of the second support part 62 is loosely fitted in the support groove. Specifically, the support ball 601 of the first support part 61 is tightly clamped between the first guide groove 111 and the second guide groove 211, providing support and guidance for the first movable side wall 21 provided with the piezoelectric actuator 30. The support ball 601 of the second support part 62 is loosely clamped between the first support groove 131 and the second support groove 231, providing a certain inclination buffer flexibility for the movable part 20 during movement while maintaining the basic support function of the first support part 61, ensuring the stability of the movable part 20.

[0113] It should be understood that the length of the ball groove directly affects the activity space and flexibility of the ball in the ball groove, and even the moving stroke of the movable part 20. Therefore, the length of the guide groove is greater than the length of the support groove, the tightly fitted ball is arranged in the guide groove with a longer length, and the loosely fitted ball is arranged in the support groove with a shorter length, so as to provide a larger activity space for the tightly fitted ball, and the flexibility of the tightly fitted ball is greater, which can reduce the risk of sliding friction of the tightly fitted ball and reduce the friction force.

[0114] Specifically, the guide groove is implemented as a V-shaped groove for tightly clamping the support ball 601 of the first support part 61, so that the support ball 601 of the first support part 61 is in point contact with the guide groove under the action of the pre-pressure, thereby reducing the friction resistance of the first support part 61 during movement of the movable part 20 in a point contact manner; the support groove can be implemented as a U-shaped groove for loosely clamping the support ball 601 of the second support part 62, providing a basic clamping effect while providing a larger activity space for the support ball 601 of the second support part 62 to avoid the movable part 20 from being stuck when inclined.

[0115] More specifically, the guide groove and the support groove are both closed grooves, which reduces the probability of external debris entering the ball groove and affecting the rolling of the ball, so that all balls can normally roll in the ball groove, ensuring the smoothness of the movement of the movable part 20 in the fixed part 10. It can also avoid the ball from being separated from the groove, affecting the reliability of the driving device.

[0116] 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.

[0117] 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.

[0118] In some embodiments, the second guide groove 211 and the second support groove 231 in the moving 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 provided 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 provided 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 first support groove 131 and the second support groove 231 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.

[0119] 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.

[0120] In the present application, the lengths of the guide groove and the support groove are designed as long as possible to ensure that the balls have a large activity space and flexibility in them, while avoiding the insert structure from blocking the balls and affecting the driving effect. Specifically, the first support part 61 provided on the same side as the piezoelectric actuator 30 needs to have sufficient length, that is, all the balls of the first support part 61 need to have sufficient length in the optical axis direction, and the ball groove accommodating the first support part 61 also needs to have sufficient length in the optical axis direction to cover the pre-stress range of the piezoelectric actuator 30, providing more effective support for single-sided pre-stress driving.

[0121] In some embodiments of the present application, the minimum length of the first support part 61 in the optical axis direction is less than the length of the guide groove in the optical axis direction, that is, the minimum total length of the plurality of support balls 601 provided on the same side as the piezoelectric actuator 30 is less than the length of the guide groove in the optical axis direction, as shown in Figure 10 、 Figure 16 and Figure 17 When the first support part 61 is implemented as the first and last support balls 601 provided on the same side as the piezoelectric actuator 30 and at least one small ball 602 located between them, the minimum distance between the first and last support balls 601 is less than the length of the guide groove in the optical axis direction, so that the balls have sufficient activity space in the guide groove, reducing the risk of sliding friction of the balls.

[0122] In some embodiments of the guide groove length of the present application, the difference between the length of the guide groove in the optical axis direction and the minimum total length of the first support part 61 is not less than the mechanical stroke of the movable part 20, i.e. the difference between the length of the guide groove in the optical axis direction and the total length of the two support balls 601 and at least one small ball 602 in the guide groove is not less than the mechanical stroke of the movable part 20, so that the support balls 601 can roll throughout the movement of the movable part 20 to support the movable part 20 and enable the movable part 20 to have sufficient movement distance to realize the fast focusing function of the camera module.

[0123] In an embodiment, the number of balls of the first support part 61 is at least three, wherein the number of support balls 601 is at least two and the number of small balls 602 is at least one. For example, the number of support balls 601 is 2 and the number of small balls 602 is greater than 3 and not greater than 8. Specifically, the number of support balls 601 is 2 and the number of small balls 602 is 4; or the number of support balls 601 is 2 and the number of small balls 602 is 5; or the number of support balls 601 is 2 and the number of small balls 602 is 6; or the number of support balls 601 is 2 and the number of small balls 602 is 7. It can be understood that the more the number of small balls 602, the greater the distance between the two support balls 601 and the greater the support area. However, if the number of small balls 602 is too large, the space occupied in the guide groove is larger and the space for the movement of the support balls 601 is smaller, which affects the rolling of the support balls 601.

[0124] In some embodiments of the present application, the movable part 20 further comprises a friction part 22 arranged on the first movable side wall 21 of the movable part 20 and towards 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 piece 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 and further enhances the driving force provided by the piezoelectric actuator 30.

[0125] Specifically, the friction part 22 is implemented as a friction plate 221 which is in a split structure with 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. The split structure reduces the difficulty of manufacturing and maintenance and is beneficial to improving the service life of the camera module.

[0126] In some embodiments, the friction plate 221 can also be integrally formed on the first movable side wall 21 of the movable part 20.

[0127] Understandably, the arrangement of the friction part 22 helps to enhance the friction between the moving part 20 and the friction head 32 of the piezoelectric actuator 30, which is beneficial to improving the driving performance in the camera module.

[0128] refer to Figure 2 and Figure 16 As shown, in some embodiments of the friction plate 221 of this application, at least a portion of the friction plate 221 and the bottom of the movable part 20 maintain frictional contact with the piezoelectric actuator 30 and the first support part 61, respectively. Under the action of the pressure block 50 and the pre-pressure member 40, the first support part 61 provides the movable part 20 with an upward support force in the second direction, providing support and guidance for the movable part 20 to move stably along the optical axis direction within the fixed part 10. The direction of the pre-pressure force is opposite to the direction of the support force, and both act on the first movable sidewall 21, further preventing the movable part 20 from tilting, thereby enhancing the stability of the optical lens 100 during optical focusing and / or optical zooming of the camera module, and thus improving the imaging quality of the camera module.

[0129] It is understood that in this application, the piezoelectric actuator 30 is located on the upper part of the friction plate 221 along the second direction and drives the movable part 20 on the top side of the movable part 20. The preload member 40 provides preload downward along the second direction to the top side of the piezoelectric actuator 30, causing the friction head 32 to make frictional contact with the friction plate 221 of the movable part 20. The piezoelectric actuator 30 provides driving force to the movable part 20 to drive the movable part 20 to move along the optical axis. Furthermore, the first support part 61 located between the fixed part 10 and the movable part 20 provides support force to the movable part 20 upward along the second direction. The support force is opposite to the direction of the preload, which helps to prevent surface contact between the movable part 20 and the fixed part 10, which would further cause excessive friction and hinder driving.

[0130] like Figure 3 and Figure 16 As shown, the piezoelectric actuator 30 has two friction heads 32, which provide sufficient driving force to the movable part 20 to ensure that the movable part 20 moves along the optical axis under the action of the driving force.

[0131] In this application, the XY interface where the guide groove is located covers as much as possible the projection of the friction point of the friction head 32 of the piezoelectric actuator 30 along the pre-pressure direction (downward in the height direction), so as to ensure that the moving space of the first support 61 covers the projection of the friction range of the friction head 32 along the pre-pressure direction (downward in the height direction), thereby enabling the first support 61 to effectively support the first movable sidewall 21 of the movable part 20 driven by the pre-pressure, and ensuring the stable movement of the movable part 20.

[0132] 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 points of the friction heads 32 during driving are located within the support range of the first and last support balls 601, improving the support effect of the first support part 61 and ensuring smooth movement of the movable part 20.

[0133] In the present application, as shown in Figures 8 to 10 , Figure 17 and Figure 18 , the driving device further comprises a magnetic attraction assembly 70, the magnetic attraction assembly 70 comprising a first magnetic attraction piece 71 and a second magnetic attraction piece 72, the first magnetic attraction piece 71 being arranged on the main body of the fixed part 10, and the second magnetic attraction piece 72 being arranged on the bottom of the movable part 20, the first magnetic attraction piece 71 and the second magnetic attraction piece 72 being oppositely arranged along the second direction and interacting to generate a magnetic attraction force. Along the first direction, the distance from the second magnetic attraction piece 72 to the second support part 62 is less than the distance from the second magnetic attraction piece 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 piece 72 is arranged in the second movable side wall 23 of the movable part 20, and the first magnetic attraction piece 71 is arranged in the second fixed side wall 13 of the fixed part 10, the first magnetic attraction piece 71 and the second magnetic attraction piece 72 being oppositely arranged along the second direction and interacting 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 where the magnetic attraction force is insufficient to resist external force, the pre-pressing force can provide additional support. Further, since the magnetic attraction assembly 70 is arranged at the bottom of the movable part 20 and the piezoelectric actuator 30 is arranged at the top side of the movable part 20, support parts can be arranged only at the bottom of the movable part 20 to achieve support of the movable part 20, further reducing the number of support parts that need to be arranged in the camera module.

[0134] It can be understood that, since the magnetic attraction assembly 70 is arranged at the bottom of the movable part 20, 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 a magnetic attraction force to reduce the risk of the movable part 20 overturning. Among them, the magnetic attraction force and the pre-pressing force are in the same direction, along the first direction, the action points of the magnetic attraction force and the pre-pressing force on the movable part 20 are respectively 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 balancing the stress of the movable part 20, which helps to reduce the optical lens 100 tilting phenomenon caused by unbalanced torque.

[0135] In some embodiments of the present application, the second magnetic attraction member 72 is arranged in the middle region between the two second support grooves 231 along the optical axis direction to reduce the overturning torque value, further reducing the risk of the movable part 20 tilting.

[0136] Specifically, as shown in Figure 10 and Figure 18 the first magnetic attraction member 71 is a metal yoke, which includes a base portion 711 and a supporting portion 712, at least a part of the base portion 711 overlaps the second magnetic attraction member 72 along the second direction, and at least a part of the supporting portion 712 overlaps the second support portion 62 along the second direction. By providing the first magnetic attraction member 71, on the one hand, the magnetic attraction force is enhanced, the pre-pressing force is better balanced, and the risk of the movable part 20 tilting is reduced; on the other hand, the support portion is stably clamped between the movable part 20 and the fixed part 10 by the magnetic attraction force, the stability of the support portion is improved, and the imaging quality of the camera module is improved.

[0137] 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 convenience of processing and increases the processing efficiency. Further, the base portion 711 and the supporting portion 712 can be a structure arranged separately, which helps to improve the flatness of the base portion 711, but when the area of the base portion 711 is too large, it is easy to deform.

[0138] 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 support groove 131, and is arranged on the lower side of the first support portion 61 and / or the second support portion 62 along the second direction, avoiding the first support portion 61 and the second support portion 62 from having a pit, further improving the use quality and service life of the camera module.

[0139] 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, which 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 part 20 are respectively subjected to the pre-pressing force and the magnetic attraction force, and the direction of the magnetic attraction force is the same as that of the pre-pressing force, which helps to reduce the risk of the movable part 20 tilting. Specifically, the pre-pressing force can be greater than the magnetic attraction force, because when the magnetic attraction force is too large, the frictional resistance that needs to be overcome by the movable part 20 during driving movement will also be larger, further increasing the power consumption of the piezoelectric actuator 30, which is not conducive to the driving of the movable part 20.

[0140] 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 be used 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 the production efficiency. Further, the yoke used in the present application has a large planar area. Increasing the metal pressing area during manufacturing can increase the planar regularity. Further, the yoke can be made of a material that is attracted to the magnet, such as metal, to further enhance the magnetic attraction and improve the stability of the optical lens 100.

[0141] 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. The magnetic attraction force generated by the magnetic assembly 70 on the second movable side wall 23 is in the same direction as the pre-pressing force generated by the pre-pressing member 40 on the first movable side wall 21, which is beneficial to improve the fit between the movable part 20 and the fixed part 10, further reduce the tilting of the movable part 20 caused by the unbalanced torque, and further reduce the risk of tilting of the optical lens 100.

[0142] In some embodiments, the piezoelectric actuator 30 further includes a conducting member 33 disposed between the piezoelectric active part 31 and the pre-pressing member 40, as shown in Figure 3 The conducting member 33 includes a first connecting part 331, a second connecting part 333, and a conducting part 334. As shown in Figure 3In the illustrated embodiment, the first connecting portion 331 is a horizontal plate body arranged between the piezoelectric active portion 31 of the piezoelectric actuator 30 and the pre-pressing member 40 in the second direction, and the second connecting portion 333 is a vertical plate body integrally bent from the first connecting portion 331 in the second direction. The conductive portion 334 extends in the optical axis direction along the outer peripheral wall of the fixed portion 10 from the second connecting portion 333 and is connected to the through member 14 provided on the fixed portion 10. Specifically, the first connecting portion 331 is a horizontal plate body arranged between the piezoelectric active portion 31 of the piezoelectric actuator 30 and the pre-pressing member 40 in the second direction, and the first connecting portion 331 can have a through hole to reduce the influence of the conductive member 33 on the piezoelectric active portion 31. The second connecting portion 333 is a vertical plate body integrally bent from the first connecting portion 331 in the second direction, and the conductive portion 334 extends in the second direction along the outer peripheral wall of the fixed portion 10 from the second connecting portion 333 and is connected to the through member 14 provided on the fixed portion 10. By providing the conductive member 33, the space utilization inside the camera module can be increased and electrical conduction can be achieved.

[0143] Reference Figure 1 , Figure 4 and Figure 11 As shown in Figure 2 , in some embodiments, in addition to the flexible circuit board, the circuit components in the camera module also include a through member 14 arranged around the outer peripheral wall of the fixed portion 10. Specifically, the through member 14 is embedded or external to the first fixed side wall 11 and the second fixed side wall 13, at least part of the through member 14 is exposed to the outer peripheral side of the fixed portion 10, and the through member 14 is provided with a through portion 141. The through member 14 is welded to the extended end of the conductive member 33 through the through portion 141 and is electrically conductive. And through the through member 14, the through of the circuit part of the photosensitive component 80, the light turning element 90 and other circuit modules is realized in a simple electrical connection manner. Among them, as shown in , the through member 14 with a bent structure is easy to connect, adapts to complex space layout and shape requirements, and further enables efficient wiring design in a narrow or irregular space, thereby improving space utilization.

[0144] In some embodiments, as shown in Figure 2 , Figure 3 and Figure 11As can be known from the foregoing, the piezoelectric actuator 30 comprises the piezoelectric active part 31, the friction head 32 and the conductive member 33, and the piezoelectric actuator 30 is in abutment with the movable part 20 under the action of the pre-pressure. Specifically, the piezoelectric active part 31 is provided with the friction head 32 on the side facing the first movable side wall 21, and the piezoelectric active part 31 generates mechanical resonance motion through the inverse piezoelectric effect. When the frequency of the applied voltage is consistent with the natural frequency of the piezoelectric active part 31, resonance will occur and ultrasonic waves will be generated. Therefore, a deflection reciprocating motion or an elliptical motion can be achieved on the specifically arranged electrode layer, so as to drive the friction head 32 to perform a deflection reciprocating motion or an elliptical motion, and then realize the sliding of the movable part 20 relative to the fixed part 10 through the friction between the friction head 32 and the first movable side wall 21.

[0145] With reference to Figure 2 , Figure 3 and Figure 11 As can be known, in some embodiments, the piezoelectric actuator 30 further comprises a buffer member 34 arranged between the pre-pressure member 40 and the piezoelectric active part 31. Since the elastic modulus of the buffer member 34 is lower than that of the pre-pressure member 40, the buffer member 34 is more prone to deformation than the pre-pressure member 40, so that it can adaptively produce different degrees of shrinkage deformation according to different tolerances in different piezoelectric actuators 30, thereby reducing the difference in pre-pressure of each piezoelectric actuator 30 with different tolerances. In other words, the buffer member 34 that can be deformed can reduce the pre-pressure variation caused by at least part of the material tolerance and assembly tolerance, and can also absorb part of the deformation of the piezoelectric active part 31. The buffer member 34 can also absorb part of the vibration deformation of the piezoelectric active part 31 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.

[0146] 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 a component below the piezoelectric active part 31. The adhesive tape is easy to install and use, has good flatness without curing, 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.

[0147] 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 of affecting the vibration mode of the piezoelectric active part 31 after using UV glue or heat-curing glue to bond the pre-pressing member 40.

[0148] As Figure 2 , Figure 3 and Figure 11 known, 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 a dielectric, the dielectric will produce a mechanical deformation phenomenon, so that the piezoelectric active part 31 can be polarized by applying an electric field in single crystal, polycrystalline ceramic, polymer 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 side wall of the movable part 20 can drive the movable part 20 to move relative to the fixed part 10, so the driving force is actually the friction force between the friction head 32 and the movable part 20.

[0149] In one embodiment of the present application, the piezoelectric active part 31 adopts a multi-layer stacked structure. Specifically, the piezoelectric active part 31 is stacked by ceramic layers and electrode layers alternately in the thickness direction, and the order is ceramic layer, electrode layer, ceramic layer, electrode layer, ceramic layer, electrode layer, ceramic layer, and so on. Each electrode layer is located between two adjacent ceramic layers. When an electric field is applied between adjacent electrode layers, the ceramic layer will produce elongation or contraction deformation. By arranging multiple electrode layers, the voltage required to drive the piezoelectric active part 31 to bend and vibrate can be reduced. The number of electrode layers and ceramic layers can be selected according to specific needs, in other words, for example, the number of ceramic layers can be greater than or equal to the number of electrode layers. The ceramic layer is usually made of a material with a piezoelectric effect, such as PZT piezoelectric ceramic; and the electrode layer is made of a conductive material, such as copper, gold, silver or silver alloy, etc. The fixation between the multi-layer ceramic layer and the multi-layer electrode layer can be achieved by ceramic co-firing process, that is, a layer of ceramic slurry is laid, then a layer of electrode slurry is laid, and then they are heated and sintered together to form a laminated piezoelectric active part 31. In addition, by providing power to the multi-layer electrode layer, the multi-layer ceramic layer arranged between the multi-layer electrode layer can be polarized.

[0150] It can be understood that the side electrical connection parts in the camera module are respectively connected with the positive voltage and the negative voltage of the power supply, thereby respectively providing at least one electrode layer with positive voltage and at least one electrode layer with negative voltage, thereby polarizing the multi-layer ceramic layer, and the piezoelectric ceramic after polarization will automatically arrange into a piezoelectric direction, further generating a piezoelectric effect.

[0151] In some embodiments, in order to improve the driving performance of the piezoelectric actuator 30, the piezoelectric active part 31 can be made of piezoelectric ceramic material or piezoelectric single crystal material, and the piezoelectric active part 31 can be a single-layer ceramic body or a multi-layer ceramic body, or a single-layer single crystal body or a multi-layer single crystal body, such as lead zirconate titanate (PZT) based piezoelectric ceramic, potassium sodium niobate (KNN) based piezoelectric ceramic, barium titanate (BT) based piezoelectric ceramic, lead magnesium niobate-lead indium niobate (PMN-PT) based piezoelectric single crystal, etc.

[0152] In some embodiments, the plane of the piezoelectric active part 31 along the optical axis direction is rectangular, and the friction head 32 is protruded on the side of the piezoelectric active part 31 along the second direction towards the movable part 20. Specifically, the number of the friction head 32 is two, and the two friction heads 32 are arranged along the optical axis direction. It can be understood that the piezoelectric actuator 30 drives the movable part 20 to move along the optical axis direction. Compared with the case where only one friction head 32 is arranged to drive the movable part 20, the arrangement of two friction heads 32 can better drive the movable part 20 to move in a long stroke.

[0153] 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 composite materials of ceramic, metal particles and polymers, etc. The use of wear-resistant materials can improve the wear resistance of the friction head 32, and help to improve the friction between the movable part 20 and the friction head 32, further enhance the driving force provided by the piezoelectric actuator 30, and due to the good wear resistance, it is beneficial to prolong the service life of the friction head 32. In addition, in some embodiments, the friction head 32 and the piezoelectric active part 31 can be an integral structure, or can be 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 between the two through surface contact, and at the same time the friction head 32 can produce obvious movement with the deformation of the piezoelectric active part 31.

[0154] In some embodiments, the piezoelectric active part 31 bends in the second direction in a mode of one wave crest and one wave trough. Since the position of the friction head 32 can be matched with the mode of the piezoelectric active part 31, the friction head 32 can be arranged at the position of the wave crest and the wave trough at the corresponding position. It can be understood that the shape of the friction head 32 can be a sphere, a hemisphere, a cuboid, a platform, a cylinder, a semi-cylinder, etc. The number of friction heads 32 can be one, two or more. In this application, the shape and number of the friction head 32, the shape and electrode arrangement of the piezoelectric active part 31, and the connection mode between the friction head 32 and the piezoelectric active part 31 are not limited.

[0155] In some embodiments, as shown in FIG. 5, the pressing block 50 includes a pressing beam 51 and a pressing arm 52 extending from both ends of the pressing beam 51 in the second direction to the fixed part 10, so that the pressing block 50 is fixed in the first receiving groove 112 of the fixed part 10. The pressing beam 51 and the pressing arm 52 have a groove 500 therebetween, which is adapted to provide a deformation space for the pre-pressing piece 40. The pressing arm 52 includes a pressing mounting platform 522 and a pressing fixed platform 521, which is located outside the pressing mounting platform 522 in the optical axis direction. The length of the pressing fixed platform 521 in the second direction is greater than the length of the pressing mounting platform 522 in the second direction, so that the groove 500 is formed between the pressing mounting platform 522 and the pressing beam 51. The pre-pressing piece 40 is mounted on the pressing mounting platform 522, and the pressing fixed platform 521 is fixed on the fixed part 10, which further simplifies the assembly process, enhances the stability of the camera module, improves the mounting stability of the pre-pressing piece 40, and enhances the stability of the provided pre-pressing force. Figure 3 In some embodiments, as shown in FIG. 5, the pressing block 50 includes a pressing beam 51 and a pressing arm 52 extending from both ends of the pressing beam 51 in the second direction to the fixed part 10, so that the pressing block 50 is fixed in the first receiving groove 112 of the fixed part 10. The pressing beam 51 and the pressing arm 52 have a groove 500 therebetween, which is adapted to provide a deformation space for the pre-pressing piece 40. The pressing arm 52 includes a pressing mounting platform 522 and a pressing fixed platform 521, which is located outside the pressing mounting platform 522 in the optical axis direction. The length of the pressing fixed platform 521 in the second direction is greater than the length of the pressing mounting platform 522 in the second direction, so that the groove 500 is formed between the pressing mounting platform 522 and the pressing beam 51. The pre-pressing piece 40 is mounted on the pressing mounting platform 522, and the pressing fixed platform 521 is fixed on the fixed part 10, which further simplifies the assembly process, enhances the stability of the camera module, improves the mounting stability of the pre-pressing piece 40, and enhances the stability of the provided pre-pressing force.

[0156] In some embodiments, the first fixing side wall 11 of the fixing part 10 further comprises a base extension 114, and a second mounting plane 1141, the second accommodating groove 113 is formed between the base extensions 114, and the second mounting plane 1141 is located at the top surface of the base extension 114, and the lower pressing fixed platform 521 of the pressing block 50 is fixedly abutted against the second mounting plane 1141. It can be understood that the lower pressing arm 52 can be connected to the fixing part 10, and the lower pressing fixed platform 521 of the lower pressing arm 52 and the second mounting plane 1141 of the fixing part 10 can be abutted against each other, further enhancing the stability and reliability of the pressing block 50. Since the lower pressing fixed platform 521 of the lower pressing arm 52 is located in a different height plane, the recess 500 is formed to provide a reserved space for the deformation of the pre-pressing piece 40. Further, by fixing the pressing block 50 to the fixing part 10, adjustment can be made during assembly, thereby reducing the risk of inconsistent assembly.

[0157] 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 piece 40 and the movable part 20 are clamped between the pressing block 50 and the fixing part 10, and at least a part of the pre-pressing piece 40 and the movable part 20 are located in the space communicated by the recess 500, the first accommodating groove 112 and the second accommodating groove 113. It can be understood that when the pressing block 50 is pressed downward more in the second direction, the clamping of at least a part of the pre-pressing piece 40 and the movable part 20 will be tighter, the deformation of the pre-pressing piece 40 will be greater, and the pre-pressing force generated by the pre-pressing piece 40 will be greater. In other words, the pressing block 50 not only provides a deformation space for the pre-pressing piece 40, maintains the deformation of the pre-pressing piece 40, but also adjusts the size of the pre-pressing force generated by the pre-pressing piece 40, for example, by moving the lower pressing beam 51 in the second direction towards the movable part 20 to further press the pressing block 50, thereby increasing the pre-pressing force of the pre-pressing piece 40.

[0158] In some embodiments, as shown in Figure 3 、 Figure 6 and Figure 16 , when the pre-pressing piece 40 is subjected to the supporting force provided by the first supporting part 61, the pre-pressing piece 40 generates a curved deformation protruding upward and generates a pre-pressing force downward in the second direction, thereby providing a pre-pressing force downward in the second direction to the movable part 20, so that the friction head 32 in the piezoelectric actuator 30 and the movable part 20 are frictionally connected to each other, further providing a stable driving force. It can be understood that the flatness and consistency of the pre-pressing piece 40 are relatively good, which helps to reduce the variation of the pre-pressing piece 40.

[0159] In some embodiments, the pre-pressing member 40 is an elastic member capable of generating deformation, so as to provide a pre-pressing force to 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 is in contact with the friction part 22 of the movable part 20 under the action of the pre-pressing force to generate a frictional force, thereby driving the movable part 20 to move. Specifically, as shown in Figure 5 the pre-pressing member 40 is a spring with a bending structure, which will generate a bending deformation protruding upward and generate a downward pre-pressing force after being acted on by the pressing block 50 and the first support part 61. It can be understood that since the pre-pressing member 40 will generate a certain tolerance during assembly, the spring with a bending structure is less affected by the tolerance fluctuation within a certain pre-pressing force range, and the pre-pressing force consistency provided by the spring with a bending structure is higher.

[0160] In some embodiments, as shown in Figure 3 and Figure 11 the pre-pressing member 40 includes a fixed end 41, an elastic part 42, and a bending part 43, wherein the bending part 43 is arranged between the fixed end 41 and the elastic part 42, the fixed end 41 is fixed to the pressing block 50, and the elastic part 42 is in abutment with the piezoelectric driving part 31. It can be understood that the elastic part 42 and the bending part 43 can also be provided with a hollow structure, which further reduces the elastic coefficient, thereby helping to reduce the influence of material tolerance, assembly tolerance, or other displacement fluctuations on the pre-pressing force.

[0161] Further, when the pre-pressing member 40 is a spring, as shown in Figure 5 the spring can be bent during manufacturing to have a certain amount of deformation. Thus, after the spring is installed with the piezoelectric actuator 30 and the pressing block 50 during assembly, the deformation amount of the spring itself exerts a pre-pressing force on the piezoelectric actuator 30 and the movable part 20. In other words, the spring is pre-deformed before subsequent assembly and fixing process, which exerts a greater pre-pressing force on the movable part 20, which is beneficial to improve the driving effect.

[0162] In some embodiments, the pre-pressing piece 40 has a flat spring structure, and it can be understood that the deformation of the pre-pressing piece 40 is caused by the cooperation of the pressing block 50 and the first supporting part 61 before the piezoelectric actuator 30 is driven. The pre-pressing piece 40 includes a fixed end 41 and an elastic part 42, the fixed end 41 is fixed to the pressing block 50, and the elastic part 42 is in abutment with the piezoelectric active part 31. When the pre-pressing piece 40 is acted on by the pressing block 50 and the first supporting part 61, the elastic part 42 of the pre-pressing piece 40 will produce a bending deformation protruding upward and generate a downward pre-pressing force. The presence of the pre-pressing force is conducive to maintaining the frictional contact between the friction head 32 and the movable part 20 to generate a stable frictional force, and the piezoelectric actuator 30 further drives the movable part 20 to move, enhancing the driving effect.

[0163] In some embodiments, as shown in Figure 6 and Figure 16 , the deformation amount of the pre-pressing piece 40 is related to the length of the downward pressing arm 52 of the pressing block 50 along the second direction. In other words, when the length of the downward pressing arm 52 along the second direction is smaller, the pressing block 50 needs to be further moved downward along the second direction to connect the downward pressing arm 52 with the fixed part 10, at this time, the downward pressing beam 51 exerts a greater downward pressure on the first supporting part 61, so that the first supporting part 61 provides a greater supporting force to the pre-pressing piece 40, thereby increasing the deformation amount of the pre-pressing piece 40 and further generating a greater pre-pressing force. When the length of the downward pressing arm 52 along the second direction is greater, the degree of downward movement of the pressing block 50 along the second direction is smaller, resulting in a smaller deformation amount of the pre-pressing piece 40 and further reducing the generated pre-pressing force. It can be understood that the length of the downward pressing arm 52 along the second direction cannot be too small, so as to avoid generating excessive supporting force and pre-pressing force, which further causes damage to the piezoelectric actuator 30, and can also cause the first supporting part 61 to be excessively pressed to form a pit. In other words, the length of the downward pressing arm 52 along the second direction cannot be too large, so as to prevent the pre-pressing piece 40 from generating a smaller deformation amount when the length of the downward pressing arm 52 along the second direction is too large, which provides a smaller pre-pressing force to the movable part 20 and cannot meet the demand of driving the movable part 20 to move. On the other hand, increasing the length of the downward pressing arm 52 along the second direction will increase the height of the camera module along the second direction, reducing the portability of the camera module.

[0164] In some embodiments, as shown in Figure 3As shown, each of the lower pressing mounting platforms 522 of the pressing block 50 is provided with a first mounting plane 523 and a mounting column 524 protruding from the first mounting plane 523 to the fixed end 41 of the pre-pressing piece 40, so that the fixed end 41 of the pre-pressing piece 40 is fixed below the first mounting plane 523 through the mounting column 524. Since the lower pressing mounting platform 522 is provided with a flush lower surface, it helps to provide a flat mounting plane for the pre-pressing piece 40, avoiding the phenomenon of inconsistent height of the pre-pressing piece 40 on both sides, thereby avoiding the phenomenon of increasing the variation of the pre-pressing piece 40 to provide inconsistent pre-pressing force to the movable part 20.

[0165] It can be understood that the mounting columns 524 provided on both sides of the lower pressing mounting platform 522 correspond to the fixing holes 411 provided on the fixed end 41 of the pre-pressing piece 40, so that during assembly, the mounting columns 524 can extend into the fixing holes 411, thereby fixing the pre-pressing piece 40 to the lower pressing mounting platform 522. Specifically, during fixing, the mounting columns 524 and the fixing holes 411 can be directly riveted and fixed, or the pre-pressing piece 40 can be pre-fixed by applying adhesive to the surface of the fixed end 41 of the pre-pressing piece 40 and the lower pressing mounting platform 522, and then fixed by riveting and fixing the mounting columns 524 and the fixing holes 411. Further enhance the stability of the pre-pressing piece 40 and the pressing block 50 during installation and use, and help to maintain the stability of the provided pre-pressing force.

[0166] In some embodiments, the pre-pressing piece 40 can be installed on the pressing block 50 first, and then the lower pressing arm 52 is fixed to the first fixed side wall 11 of the fixed part 10 after the pressing block 50 is turned over, further optimizing the assembly process of the pre-pressing piece 40 and the pressing block 50, increasing the assembly efficiency, and reducing the assembly difficulty. It can be understood that during the assembly process, the piezoelectric actuator 30 and the pre-pressing piece 40 are assembled as a semi-finished product first, and then the pre-pressing piece 40 with the piezoelectric actuator 30 is used for the next assembly. 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, and due to the characteristics of the pre-pressing piece 40, it is also difficult to adjust the pre-pressing piece 40 during the assembly process. Compared with the above-mentioned mode, the pre-pressing piece 40 is installed on the pressing block 50 first, and then the lower pressing arm 52 is fixed to the fixed part 10 after the pressing block 50 is turned over, so that the position of the friction head 32 and the movable part 20 does not need to be aligned at all times during the assembly process of the pre-pressing piece 40, the assembly difficulty is reduced, and the pre-pressing piece 40 is assembled on the pressing block 50, 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.

[0167] In some embodiments, the driving device further comprises a driving control component for sensing and controlling the moving position of the movable part 20. The driving control component is arranged on the side of the movable part 20 to reasonably utilize the space of the camera module and increase the compactness of the structure. Further, the driving control component can comprise a Hall element, an integrated circuit driver (driver IC), a tunneling magnetoresistance (TMR), etc.

[0168] In some embodiments of the present application, as shown in Figure 1 The camera module further comprises an optical system, which is assembled inside the fixed part 10 since the fixed part 10 is a frame. The optical system comprises, in sequence along the optical axis, a light turning element 90, an optical lens 100 and a photosensitive assembly 80. The optical lens 100 is arranged on the light turning path of the light turning element 90, and the photosensitive assembly 80 is used to receive the light transmitted from the optical lens 100 and perform imaging. Specifically, the light output direction of the light turning element 90, the axial direction of the optical lens 100 and the normal direction of the photosensitive assembly 80 are arranged along the optical axis. The light turning element 90 is located on the side close to the light incidence inside the fixed part 10, the optical lens 100 is located in the central region inside the fixed part 10, and the photosensitive assembly 80 is located on the side far from the light incidence inside the fixed part 10. The camera module provided by the present application has the characteristics of easy assembly and good consistency of pre-pressure in the camera module.

[0169] In some embodiments of the present application, the light turning element 90 has an incident surface and an exit surface, the incident surface and the exit surface intersect, and the light turning element 90 changes the propagation direction of the light 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, so as to realize the converging effect of the optical lens 100 on the light. After receiving the converging light, the photosensitive assembly 80 converts the received optical signal into an electrical signal for imaging processing.

[0170] In some embodiments, the number of optical lenses 100 can be two, wherein one of the two optical lenses 100 can be fixed, and the other optical lens 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. Of course, in this example, both of the two optical lenses 100 can also be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. Further, the number of optical lenses 100 can be three, wherein two of the three optical lenses 100 can be fixed, and the other optical lens 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. Of course, in this example, one of the three optical lenses 100 can be fixed, and the other two optical lenses 100 can be driven and moved along the optical axis direction to realize the optical focusing and optical zooming functions. In other specific examples of the present application, the number of optical lenses 100 can also be four, five, etc., and is not limited by the present application.

[0171] In some embodiments, the light sensing assembly 80 further includes a chip circuit board, a light sensing chip, a light filtering element, and a light filtering element support. The light sensing chip is arranged on and connected to the chip circuit board. The light filtering element support is located on the side of the light sensing chip and arranged on the chip circuit board. The light filtering element support and the chip circuit board are integrally formed or are in a split structure. The light filtering element is mounted on the light filtering element support to maintain the light sensing path of the light sensing chip and filter the imaging light entering the light sensing chip.

[0172] The present application can also provide a camera module, as shown in Figure 1 which includes: a driving device as above; a light turning element 90 for turning the incident light, an optical lens 100 held on the light turning path of the light turning element 90; a light sensing assembly 80 for receiving light from the optical lens 100.

[0173] The present application provides an assembly method of a camera module, as shown in Figures 12 to 15 which includes the steps of: S1, providing a fixed part 10 and a movable part 20, installing the movable part 20 in the fixed part 10, the movable part 20 is used to carry an optical lens 100, and the optical lens 100 defines an optical axis; S2, providing a piezoelectric actuator 30 and a pre-pressing member 40, the pre-pressing member 40 is located on the top of the piezoelectric actuator 30, the piezoelectric actuator 30 is located on the top side of at least a part of the movable part 20, and under the action of the pre-pressing member 40, the piezoelectric actuator 30 exerts a pre-pressing force on the movable part 20 along the second direction, and the bottom end is in frictional contact with the movable part 20, for driving the movable part 20 to move along the optical axis direction; S3, assembling a first support part 61 and a second support part 62 between the movable part 20 and the fixed part 10, the first support part 61 is arranged on the same side of the piezoelectric actuator 30, and the second support part 62 is arranged on the opposite side of the piezoelectric actuator 30, wherein the first support part 61 has at least two support balls 601, and the second support part 62 has at least one support ball 601.

[0174] By assembling the first support part 61 and the second support part 62 between the movable part 20 and the fixed part 10, more support balls 601 are arranged in the support part on the same side of the piezoelectric actuator 30 to ensure that the movable part 20 is sufficiently supported on the side driven by the piezoelectric, reduce the overturning moment generated by the pre-pressing force of the pre-pressing member 40, and maintain the stable movement of the movable part 20.

[0175] The application also provides an assembling method of a camera module, which comprises the following steps: S1, providing a fixed part 10; S2, providing a movable part 20, installing the movable part 20 in the fixed part 10, and the movable part 20 is used for carrying an optical lens 100, and the optical lens 100 defines an optical axis; S3, providing a piezoelectric actuator 30, a pre-pressing member 40 and a pressing block 50, assembling the piezoelectric actuator 30, the pre-pressing member 40 and the pressing block 50 to form a pre-pressing driving assembly, wherein the pre-pressing member 40 is arranged between the piezoelectric actuator 30 and the pressing block 50, the piezoelectric actuator 30 is installed on the pre-pressing member 40, the pressing block 50 is coupled with the pre-pressing member 40, and the pre-pressing member 40 is provided with a deformable pre-set space; S4, installing the pre-pressing driving assembly in the fixed part 10 along the 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 member 40 exerts a pre-pressing force on the piezoelectric actuator 30 perpendicular to the optical axis direction (i.e. the second direction), 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.

[0176] 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 layer by layer, the assembly process is further simplified, and the assembly tolerance is reduced.

[0177] In some embodiments, a method for assembling a camera module, step S1 further comprises the following step: 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.

[0178] In some embodiments, a method for assembling a camera module, step S2 further comprises the following step: S21, providing a second magnetic attraction member 72, the second magnetic attraction member 72 being arranged on the movable part 20; S22, providing a first support part 61 and a second support part 62, assembling the first support part 61 on the first guide slot 111, assembling the second support part 62 on the first support slot 131, the second magnetic attraction member 72 and the first magnetic attraction member 71 being arranged 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.

[0179] In some embodiments, a method for assembling a camera module, step S3 further comprises the following step: S31, first fixing the pre-pressing member 40 and the piezoelectric actuator 30, and then coupling the pre-pressing member 40 to the pressing block 50 to form a pre-pressing driving assembly. In this way, the pre-pressing member 40 can be assembled with the pressing block 50 together with the piezoelectric actuator 30, thereby reducing the assembly difficulty.

[0180] 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 arranged between the two fixed ends 41 and the elastic part 42 and connecting the elastic part 42 and the two fixed ends 41 respectively, 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.

[0181] 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 comprises: S31b, first coupling the pre-pressing member 40 to the pressing block 50, and then mounting the piezoelectric actuator 30 on the pre-pressing member 40 to form a pre-pressing driving assembly.

[0182] Specifically, step S3 further comprises the following step: Step S31, at least two support balls 601 disposed on the same side of the pre-pressing driving assembly and at least one small ball 602 disposed between the at least two support balls 601 are assembled to the first guide groove 111, and at least one support ball 601 disposed on the opposite side of the pre-pressing driving assembly is assembled to the first support groove 131.

[0183] Further, in some embodiments, step S4 further comprises steps of: S41, the lower pressing arm 52 of the pressing block 50 is installed to the fixed part 10, 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, 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; S42, the pre-pressing piece 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 lower pressing force.

[0184] Specifically, in step S41, the pressing block 50 is installed in the first accommodating groove 112 of the fixed part 10.

[0185] Further, after assembling the piezoelectric actuator 30, the pre-pressing piece 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 inclination of the movable part 20 and poor consistency of the camera module assembly caused by assembly errors.

[0186] Further, in step S31, the pre-pressing piece 40 further comprises a mounting part 44, 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.

[0187] The above describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection claimed by the present application is defined by the appended claims and their equivalents.

Claims

1. A drive device characterized by comprising: The utility model relates to a kind of optical lens, including: Movable part, for carrying optical lens, the optical lens defines a optical axis, the movable part includes opposite first movable side wall and second movable side wall, the bottom of the first movable side wall has guiding groove extending along the direction of optical axis; Fixed part, the movable part is movably arranged in the fixed part; First support part and second support part are arranged between the movable part and the fixed part, the first support part is arranged between the bottom of the first movable side wall and the fixed part, and the second support part is arranged between the second movable side wall and the fixed part; The first support part includes at least two support balls, and the second support part includes at least one support ball; The number of the support ball of the first support part is greater than the number of the support ball of the second support part, and the support ball of the first support part is contained in the guiding groove; 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 optical axis; Pre-pressing piece, arranged on the piezoelectric actuator, and pre-pressing force is applied to the first movable side wall and the first support part perpendicular to the direction of optical axis.

2. The drive apparatus according to claim 1, wherein The first support part includes at least two support balls and at least one small ball between them, and the pre-pressing force of the pre-pressing piece acts between the connecting line of the at least two support balls of the first support part.

3. The drive apparatus according to claim 1, wherein It also includes a pressing block fixed to the fixed part, the pressing block, the pre-pressing piece and the piezoelectric actuator are sequentially located at the top of the first movable side wall of the movable part along the second direction, and the projection of the first support part along the second direction is entirely located in the projection range of the pressing block along the second direction, wherein the second direction is perpendicular to the direction of optical axis.

4. The drive apparatus according to claim 3, characterized by The piezoelectric actuator includes a piezoelectric active part and a friction head connected to each other, and the friction head is in frictional contact with the first movable side wall, wherein the imaginary line of the pre-pressing force direction of the pressing block, the pre-pressing piece, the friction head and the first support part along the second direction passes through.

5. The drive apparatus according to claim 4, characterized by The cross-sectional center of the pressing block, the position where the friction head acts on the first movable side wall and the cross-sectional center of the first support part are aligned in the second direction.

6. The drive apparatus according to claim 3, characterized by The first support part provides support force along the second direction for the first movable side wall, and the pre-pressing piece deforms under the action of the pressing block and the first support part to generate the pre-pressing force, wherein the direction of the pre-pressing force is opposite to the direction of the support force.

7. The drive apparatus according to claim 1, wherein The bottom of the second movable side wall has a support groove extending along the direction of optical axis, and the second support part is contained in the support groove.

8. The drive apparatus according to claim 7, wherein The number of the guiding groove and the support groove is one, the guiding groove penetrates the bottom of the first movable side wall along the direction of optical axis, and the support groove penetrates at least a part of the bottom of the second movable side wall along the direction of optical axis;The length of the guiding groove along the direction of optical axis is greater than the length of the support groove along the direction of optical axis.

9. The drive apparatus according to claim 7, wherein The support ball of the first support part is tightly fitted in the guiding groove, and the support ball of the second support part is loosely fitted in the support groove.

10. The drive apparatus according to claim 1, wherein The difference between the length of the guide groove in the direction of the optical axis and the minimum total length of the first support part is not less than the mechanical stroke of the movable part.

11. An image capture module, comprising: Comprise: The driving device as claimed in any one of claims 1 to 10; A light turning element for turning an incident light ray, An optical lens held on a light turning path of the light turning element; A light sensing assembly for receiving a light ray from the optical lens.

Images