A driving device and its camera module

Abstract

This application discloses a driving device and its camera module, belonging to the field of camera modules. The driving device includes: a movable part, the top of which has a friction plate extending along the optical axis, and the bottom of which has a guide groove extending along the optical axis; a fixed part; a piezoelectric actuator including at least one friction head, which frictionally contacts the friction plate; a pre-pressing member; and a first support part disposed between the bottom of the movable part and the fixed part, the first support part including a plurality of support balls; when the movable part moves to its limit position, the plurality of support balls are concentrated at one end of the guide groove, wherein the distance between the plurality of support balls is not less than the maximum distance from at least one friction head to one end of the friction plate. The driving device and its camera module provided by this application have the advantages of easy assembly, prevention of optical lens tipping, and improved imaging stability of the camera module.

Description

Technical Field

[0001] This application relates to the field of camera modules, and more particularly to a driving device and a camera module thereof. Background Technology

[0002] Currently, as electronic devices continue to evolve towards miniaturization and high performance, camera modules, as a standard component of electronic devices, are facing increasingly stringent user demands for both small size and high imaging capabilities. To further enhance user experience, the industry is actively working on compact design and functional integration improvements for camera modules. Through technological innovation and functional integration, the industry is continuously driving the development of camera modules towards greater compactness and intelligence, further realizing functions such as autofocus, zoom, image stabilization, and telephoto capabilities.

[0003] A periscope camera module is a special type of camera module that uses an optical path deflector to change the path of light, allowing it to be placed horizontally in electronic devices such as mobile phones. This solves the problem of excessively tall telephoto camera modules caused by the excessive optical length of telephoto lenses. This design allows the camera to provide a longer focal length and higher zoom capability without increasing the module thickness.

[0004] Existing periscope camera modules use top-mounted piezoelectric motors, which can provide greater driving force while reducing overall size, meeting the driving requirements of long focal length periscope camera modules. Since the piezoelectric motor is located on the top side of the moving carrier, the assembly precision between the driving surface of the moving carrier and the piezoelectric motor directly affects the operation of the moving carrier after it is driven. The moving carrier is prone to tipping over, overturning, or even getting stuck inside the base of the camera module due to uneven force. Summary of the Invention

[0005] One objective of this application is to provide a driving device and its camera module, which, by setting the relationship between the minimum spacing of the first support portion and the distance from the friction head to one end of the friction plate, alleviates to some extent the problem of the movable portion easily overturning at the extreme position, so as to ensure that the movable portion can still be stably supported when it moves to the extreme position, and reduces the risk of the movable portion overturning due to uneven force at the extreme position.

[0006] To achieve the above objectives, the technical solution adopted in this application is a driving device for a periscope camera module, comprising:

[0007] A movable part for supporting an optical lens, the optical lens defining an optical axis, the top of the movable part having a friction plate extending along the optical axis direction, and the bottom of the movable part having a guide groove extending along the optical axis direction;

[0008] A fixed part, wherein the movable part is movably disposed within the fixed part;

[0009] A piezoelectric actuator includes at least one friction head that is in frictional contact with the friction plate and is used to drive the movable part to move along the optical axis.

[0010] A preload element is disposed on the top of the piezoelectric actuator and applies a preload perpendicular to the optical axis to the moving part;

[0011] A first support portion is disposed between the bottom of the movable portion and the fixed portion. The first support portion includes a plurality of support balls. When the movable portion moves to its limit position, the minimum spacing between the plurality of support balls arranged closely is not less than the maximum distance from the at least one friction head to one end of the friction plate.

[0012] As a preferred embodiment, the movable part includes opposing first and second movable sidewalls. The pre-pressing member, the friction head, and the friction plate are sequentially located at the top of the first movable sidewall along a second direction, and the first support part is located at the bottom of the first movable sidewall. The projections of the pre-pressing member along the second direction, the friction head along the second direction, the friction plate along the second direction, and the first support part along the second direction overlap each other, wherein the second direction is perpendicular to the optical axis direction.

[0013] As a preferred embodiment, the movable part includes an incident light side and an exit light side. When the movable part moves toward the incident light side to its limit position, the plurality of support balls are concentrated and arranged at one end of the guide groove near the exit light side. The minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the exit light side.

[0014] As a preferred embodiment, when the movable part moves toward the light-emitting side to its limit position, the plurality of support balls are concentratedly arranged at one end of the guide groove near the light-incident side, and the minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the light-incident side.

[0015] As a preferred embodiment, the movable part includes an incident light side and an exit light side. When the movable part moves toward the incident light side to its limit position, the plurality of support balls are concentrated and arranged at one end of the guide groove near the incident light side. The minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the incident light side.

[0016] As a preferred embodiment, when the movable part moves toward the light-emitting side to its limit position, the plurality of support balls are concentratedly arranged at one end of the guide groove near the light-emitting side, and the minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the light-emitting side.

[0017] As a preferred embodiment, the projection of the friction plate along the second direction overlaps with the line connecting the farthest endpoints of the two guide grooves, and the projection of the friction plate along the second direction overlaps with the line connecting the two support balls of the first support portion.

[0018] As a preferred embodiment, the projection of the friction head along the second direction overlaps with the projection of the line connecting the first and last balls of the first support portion along the second direction.

[0019] Preferably, the projection of the friction head along the second direction is covered by the projection of the guide groove along the second direction.

[0020] As a preferred embodiment, it further includes: a pressure block, which is fixed to the fixing part, the pressure block is coupled to the pre-compression member, and provides a deformable preset space for the pre-compression member; the pressure block is placed on top of the pre-compression member, and the projection of the first support part along the second direction is entirely within the projection range of the pressure block along the second direction.

[0021] As a preferred embodiment, the maximum distance from the at least one friction head to one end of the friction plate is not less than the mechanical stroke of the moving part.

[0022] To achieve the purpose of this application, the technical solution adopted in this application is a camera module, comprising:

[0023] Any of the above-mentioned driving devices;

[0024] Optical deflector element used to deflect incident light rays

[0025] An optical lens, wherein the optical lens is held on the light-reversing path of the light-reversing element;

[0026] A photosensitive component for receiving light from the optical lens. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the camera module structure in some embodiments of this application.

[0028] Figure 2 This is a schematic diagram of the exploded structure of the camera module in some embodiments of this application.

[0029] Figure 3 This is a schematic diagram of the exploded structure of the driving device in some embodiments of this application.

[0030] Figure 4 This is a schematic diagram of the exploded structure of the camera module in some other embodiments of this application.

[0031] Figure 5 This is a cross-sectional structural diagram of the driving device in the optical axis direction in some embodiments of this application.

[0032] Figure 6 This is a cross-sectional structural diagram of the driving device in the optical axis direction in some other embodiments of this application.

[0033] Figure 7 This is a schematic cross-sectional view of the camera module in a first direction in some embodiments of this application.

[0034] Figure 8 This is a bottom view of the camera module structure in some embodiments of this application.

[0035] Figure 9 This is a bottom view of the camera module structure in some other embodiments of this application.

[0036] Figure 10 This is a bottom view of the camera module structure in some embodiments of this application.

[0037] Figure 11 This is a schematic diagram of the exploded structure of the driving device in some other embodiments of this application.

[0038] Figure 12 for Figure 11 A schematic diagram of the assembly process of the first support part, the second support part, and the fixing part of the driving device in the embodiment shown.

[0039] Figure 13 for Figure 11 A schematic diagram of the assembly process of the moving part of the drive device in the illustrated embodiment.

[0040] Figure 14 for Figure 11 The diagram shows the assembly process of the piezoelectric actuator and pre-pressing component of the drive device in the embodiment shown.

[0041] Figure 15 for Figure 11 A schematic diagram of the assembly process of the pressure block and pre-pressure component of the drive device in the embodiment shown.

[0042] Figure 16 This is a cross-sectional structural diagram of the driving device in the optical axis direction in a modified embodiment of this application.

[0043] Figure 17 This is a schematic diagram of the drive device in a modified embodiment of this application without a fixed part.

[0044] Figure 18 This is a cross-sectional structural diagram of a camera module with a single friction head moving to its limit position toward the light-incident side in a modified embodiment of this application.

[0045] Figure 19 This is a cross-sectional structural diagram of a camera module with a single friction head in a modified embodiment of this application, showing the module moving to its limit position towards the light-emitting side.

[0046] Figure 20 This is a cross-sectional structural diagram of a camera module with dual friction heads in a modified embodiment of this application, showing the module moving to its limit position towards the light-incident side.

[0047] Figure 21 This is a cross-sectional structural diagram of a camera module with dual friction heads in a modified embodiment of this application, showing the module moving to its limit position towards the light-emitting side.

[0048] Figure 22 This is a cross-sectional structural diagram of a camera module with a single friction head moving to its limit position toward the light-incident side in another modified embodiment of this application.

[0049] Figure 23 This is a cross-sectional structural diagram of a camera module with a single friction head moving to its limit position toward the light-emitting side in another modified embodiment of this application.

[0050] Figure 24 This is a cross-sectional structural diagram of a camera module with dual friction heads moving to its limit position toward the light-incident side in another modified embodiment of this application.

[0051] Figure 25 This is a cross-sectional structural diagram of a camera module with dual friction heads moving to its limit position toward the light-emitting side in another modified embodiment of this application.

[0052] In the figure: 10. Fixing part; 11. First fixing sidewall; 111. First guide groove; 112. First receiving groove; 113. Second receiving groove; 114. Base extension; 1141. Second mounting plane; 12. Fixing body; 13. Second fixing sidewall; 131. First support groove; 14. Conductor; 141. Conducting part; 20. Movable part; 21. First movable sidewall; 211. Second guide groove; 22. Friction part; 221. Friction plate; 23. Second movable sidewall; 231. Second support groove; 30. Piezoelectric actuator; 31. Piezoelectric active part; 32. Friction head; 33. Conductive element; 34. Buffer element; 331. First connecting part; 333 334. Second connecting part; 435. Conductive part; 40. Pre-compression part; 41. Fixed end; 411. Fixed hole; 42. Elastic part; 43. Bending part; 44. Mounting part; 50. Pressure block; 51. Lower pressure beam; 52. Lower pressure arm; 521. Lower pressure fixing platform; 522. Lower pressure 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 suction assembly; 71. First magnetic suction element; 711. Base part; 712. Support part; 72. Second magnetic suction element; 80. Photosensitive assembly; 90. Light conversion element; 100. Optical lens. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0055] In the description of this application, it should be understood that the terms "center", "lateral", "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] In this application, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation can be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a mutually exclusive, independent, or alternative implementation. It is explicitly and implicitly understood by those skilled in the art that the implementations described in this application can be combined with other implementations.

[0058] As mentioned above, it should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, components, or groups of features, integers, steps, or components. As used in this application, the singular forms "a," "an," and "the" also include the plural forms, unless the context clearly indicates otherwise.

[0059] The terms “a” and “an” used in this specification may mean one, but may also be used interchangeably with “at least one” or “one or more”. The term “about” generally means the mentioned value plus or minus 10%, or more specifically, plus or minus 5%. The term “or” used in the claims means “and / or” unless it is explicitly stated that it refers only to alternatives.

[0060] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0061] according to Figures 1 to 25 As shown, one or more embodiments of this application disclose a driving device, including: a movable part 20 for carrying an optical lens 100, the optical lens 100 defining an optical axis, the top of the movable part 20 having a friction plate 221 extending along the optical axis direction, and the bottom of the movable part 20 having a guide groove extending along the optical axis direction; a fixed part 10, the movable part 20 being movably disposed within the fixed part 10; and a piezoelectric actuator 30 including at least one friction head 32, the at least one friction head 32 being in frictional contact with the friction plate 221. The actuator 30 is used to drive the movable part 20 to move along the optical axis; the pre-pressure member 40 is disposed on the top of the piezoelectric actuator 30 and applies a pre-pressure perpendicular to the optical axis to the movable part 20; the first support part 61 is disposed between the bottom of the movable part 20 and the fixed part 10, and the first support part 61 includes a plurality of support balls 601; when the movable part 20 moves to the limit position, the minimum spacing of the plurality of support balls 601 closely arranged is not less than the maximum distance from the at least one friction head 32 to one end of the friction plate 221.

[0062] In this application, the pre-pressure generated by the pre-pressure member 40 is applied to the first movable sidewall 21 through the friction head 32. The guide groove is located at the bottom of the first movable sidewall 21, and the multiple balls of the first support part 61 are located in the guide groove so that the movable part 20 is supported by the first support part 61 during normal movement.

[0063] Based on this, when the limit position is reached, that is, when the movable part 20 is at its limit position near the light-incident side or the light-outcident side, the support balls 601 will be concentrated at one end of the guide groove or near one end of the guide groove. It should be understood that the pre-pressure generated by the pre-pressure member 40 is transmitted to the first movable sidewall 21 through the friction head 32. If the support balls 601 are concentrated, causing the friction contact position between the friction head 32 and the first movable sidewall 21 to not be supported by the first support part 61 in the second direction, the movable part 20 may be at risk of overturning.

[0064] Therefore, in this application, when the movable part 20 moves to its limit position, the total length of the plurality of support balls 601 in the first support part 61 in the concentrated state, that is, the distance between the first and last support balls 601, is not less than the maximum distance from the at least one friction head 32 to one end of the friction plate 221, so as to keep the point of action of the friction head 32 on the movable part 20 always within the range supported by the support balls 601. The preload member 40 can always get effective support from the first support part 61 through the friction contact position of the friction head 32 acting on the first movable side wall 21, so as to avoid the movable part 20 from overturning at the limit position as much as possible.

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

[0066] In an embodiment of the pre-pressure drive structure of this application, the pre-pressure drive structure of the drive device includes a piezoelectric actuator 30, a pre-pressure member 40, and a pressure block 50. The piezoelectric actuator 30 is disposed on the top of at least a portion of the movable part 20 along a second direction. At least a portion of the pre-pressure member 40 is clamped between the piezoelectric actuator 30 and the pressure block 50 along the second direction. The pressure block 50 controls the deformation of the pre-pressure member 40 to generate a pre-pressure along the second direction. The piezoelectric actuator 30 and the movable part 20 abut against each other under the action of the pre-pressure. The pre-pressure member 40 and the pressure block 50 are disposed above the height direction (second direction Z-axis) of at least a portion of the movable part 20. The pressure block 50 is coupled to the pre-pressure member 40. By designing the pressure block 50 to be installed from the top onto the fixed part 10 for assembly, the assembly process of the camera module is simplified, further reducing the tilting phenomenon of the movable part 20 and the poor consistency of the camera module caused by assembly errors, thereby improving the imaging stability of the camera module. Furthermore, the pressure block 50 can also adjust the degree of deformation of the pre-compression component 40, thereby adjusting the magnitude of the pre-pressure and improving the performance of the drive device. Even further, the pressure block 50 can also protect the pre-compression component 40, preventing it from interfering with other components in the drive device during deformation, thus affecting the performance of the pre-compression component 40.

[0067] Specifically, the pressure block 50 is fixed to the fixing part 10, the pressure block 50 is coupled to the pre-compression member 40, and provides a deformable preset space for the pre-compression member 40. More specifically, the pressure block 50 is placed on top of the pre-compression member 40.

[0068] refer to Figure 2 , Figure 3 and Figure 11 As can be seen, in some embodiments of the piezoelectric actuator 30 of this application, the piezoelectric actuator 30 includes a piezoelectric active part 31 and a friction head 32 connected to each other. Due to the pre-pressure applied to the piezoelectric actuator 30 by the pre-pressure member 40 along the second direction toward the movable part 20, the movable part 20 and the friction head 32 in the piezoelectric actuator 30 always maintain frictional contact. This is beneficial because after the piezoelectric active part 31 receives voltage, it can drive the movable part 20 to move along the optical axis, reducing the shaking of the optical lens 100 and the tilt it produces during the driving process, thereby improving the imaging accuracy and imaging stability of the camera module during autofocus.

[0069] Understandably, by keeping the movable part 20 in contact with the friction head 32, 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 spent in the focusing process. Furthermore, while improving the driving force provided by the piezoelectric actuator 30, it also enhances the stability of the camera module, reduces image jitter, and thus improves image quality.

[0070] The imaginary line of the pressure block 50, the pre-pressure member 40, the friction head 32, and the first support part 61 along the direction of the pre-pressure in the second direction passes through them, ensuring that the area of ​​the movable part 20 subjected to the pre-pressure and the area supported by the first support part 61 is concentrated as much as possible in the same direction on the first movable side wall 21, so as to reduce the overturning moment and maintain the stability of the movement of the movable part 20.

[0071] Furthermore, the center of the cross section of the pressure block 50, the position of the friction head 32 acting on the movable part 20, and the center of the cross section of the first support part 61 are aligned in the second direction, thereby improving the targeting of the support force and reducing the overturning moment more precisely.

[0072] In some embodiments, a portion of the movable part 20 that abuts against the friction head 32 is disposed on the same side as the pressure block 50, such as... Figure 7 As shown, the movable part 20 extends along the width direction (first direction Y-axis) toward an inner wall of the fixed part 10 on which the piezoelectric actuator 30 is mounted, with a portion of the movable part 20 that abuts against the friction head 32, the friction head 32, the piezoelectric active part 31, and the pressure block 50 distributed sequentially along the height direction (second direction Z-axis) within one side wall of the fixed part 10. This improves the compactness of the side structure distribution and, to a certain extent, ensures that the pre-pressure downward along the second direction is perpendicular to the friction surface (XY interface) between the movable part 20 and the friction head 32, thereby maximizing the actuation effect of the pre-pressure and improving driving efficiency.

[0073] refer to Figure 5 and Figure 6 It is understood that in some embodiments, the fixing part 10 is provided with a first receiving groove 112 and a second receiving groove 113. The first receiving groove 112 and the second receiving groove 113 are opened on the same side of the fixing body 12 along the second direction. The first receiving groove 112 is connected to the upper part of the second receiving groove 113. The pressure block 50 is disposed in the first receiving groove 112. One side of the movable part 20 is accommodated in the second receiving groove 113. The dimension of the first receiving groove 112 along the optical axis direction is larger than the dimension of the second receiving groove 113 along the optical axis direction.

[0074] Specifically, since the length of the first receiving groove 112 along the optical axis is greater than the length of the second receiving groove 113 along the optical axis, the pressure block 50 contained in the first receiving groove 112 can be fixed to the fixing part 10, further increasing the stability and reliability of the pressure block 50.

[0075] Furthermore, the pressure block 50 is placed in the first receiving groove 112, the movable part 20 is placed in the second receiving groove 113, and the pre-pressing member 40 and the piezoelectric actuator 30 are sequentially arranged between the pressure block 50 and the movable part 20, making the structure more compact and increasing the space utilization rate inside the camera module.

[0076] It is understood that the length of the second receiving groove 113 along the optical axis is greater than the length of the movable part 20 along the optical axis, thereby providing space for at least a portion of the movable part 20 to move along the optical axis within the second receiving groove 113 when driven by the piezoelectric actuator 30.

[0077] In one embodiment of the supporting part 20 in this application, the driving device further includes a first support part 61 and a second support part 62 located between the fixed part 10 and the movable part 20. The length direction of both is parallel to the optical axis (third direction X-axis) and the width direction (first direction Y-axis) are respectively located on opposite sides of the bottom of the fixed part 10 and the movable part 20. The first support part 61 is disposed on the same side as the piezoelectric actuator 30, and the second support part 62 is disposed on the opposite side of the piezoelectric actuator 30, so that the movable part 20 can move stably in the fixed part 10 and improve the stability of the driving device.

[0078] The first support portion 61 is disposed between the fixed portion 10 and the movable portion 20 along the second direction. At least a portion of the upper and lower parts of the movable portion 20 maintain frictional contact with the piezoelectric actuator 30 and the first support portion 61, respectively. In this drive device, the pre-pressure member 40, the piezoelectric actuator 30, the movable portion 20, and the first support portion 61 are sequentially clamped between the pressure block 50 and the fixed portion 10 along the second direction. The pressure block 50, the pre-pressure member 40, and the piezoelectric actuator 30 are sequentially located on the top of the first movable sidewall 21 of the movable portion 20 along the second direction. The first support portion 61 provides an upward supporting force to the first movable sidewall 21 along the second direction. The pre-pressure member 40 deforms under the combined action of the first support portion 61 and the pressure block 50 to generate pre-pressure. It is understandable that if the pressure block 50 is not fixed to the fixing part 10, the pre-pressure member 40 and the pressure block 50 will move upward in the second direction under the action of the first support part 61, causing the pressure block 50, the pre-pressure member 40, and the piezoelectric actuator 30 to detach from the movable part 20. This would prevent the pre-pressure member 40 from deforming and generating pre-pressure, affecting the drive. To avoid this situation, the pressure block 50 is fixedly connected to the fixing part 10 in this application. Under the action of the first support part 61, the pressure block 50 will generate downward pressure in the second direction due to its connection with the fixing part 10. This prevents the pre-pressure member 40 and the pressure block 50 from detaching and maintains the deformation of the pre-pressure member 40, thus ensuring the generation of pre-pressure. The direction of the pre-pressure is the same as the direction of the downward pressure, the direction of the downward pressure is opposite to the direction of the supporting force, and the direction of the pre-pressure is opposite to the direction of the supporting force. It is understandable that if only the pre-pressure acts on the top side of the movable part 20 on one side, it may increase the risk of the movable part 20 overturning. Therefore, in order to maintain the force balance of the movable part 20, the first support part 61 provides the movable part 20 with a support force in the opposite direction to the pre-pressure to balance the pre-pressure and reduce the risk of the movable part 20 overturning.

[0079] In some embodiments, the preload 40 deforms under the action of the pressure block 50 and the first support 61 to generate a preload, the direction of which is the same as the downward pressure. Due to the preload, the friction head 32 and the movable part 20 maintain frictional contact at all times, which is beneficial for the piezoelectric actuator 30 to generate a stable driving force.

[0080] The dimension of the pressure block 50 along the optical axis is larger than that of the first support portion 61 along the optical axis. Furthermore, in the optical axis direction, the projection of the first support portion 61 along the second direction is entirely within the projection range of the pressure block 50 along the second direction. This ensures a more uniform force distribution on the multiple supports within the first support portion 61. The second direction is perpendicular to the optical axis. Further, the dimension of the pressure block 50 along the optical axis is also larger than that of the guide groove along the optical axis. In the optical axis direction, the projection of the guide groove along the second direction is entirely within the projection range of the pressure block 50 along the second direction. This ensures that even if the position of the first support portion 61 changes within the guide groove, the projection of the first support portion 61 along the second direction will always remain entirely within the projection range of the pressure block 50 along the second direction. As previously described, the pressure block 50 provides deformation space for the pre-pressed component 40, maintains the deformation generated by the pre-pressed component 40, and allows adjustment of the pre-pressure generated by the pre-pressed component 40. Since the first support 61, the pressure block 50, and the pre-pressure member 40 are located on the same side relative to the optical axis, the pre-pressure can act more directly on the first support 61, and the adjustment of the pre-pressure by the pressure block 50 can also directly affect the first support 61. Since the projection of the first support 61 along the second direction is entirely within the projection range of the pressure block 50 along the second direction, on the one hand, the pressure block 50 keeps the pre-pressure member 40 and the first support 61 in close spatial alignment to generate pre-pressure and support force; on the other hand, during the driving process, the first support 61 remains within the range of the pressure block 50, reducing the risk of the movable part 20 overturning and improving the stability of the driving device; furthermore, the pre-pressure adjusted by the pressure block 50 can be dispersed by the multiple supports of the first support 61, making the force on each support more uniform. Especially when a drop or impact occurs, the multiple supports can disperse the impact force, reducing the risk of dents in the first support 61. Furthermore, the pressure block 50 can also protect the first support 61 from detaching and affecting the reliability of the driving device.

[0081] To facilitate the description of the orientation of the piezoelectric actuator 30 and the support portion on the drive device, the two side walls of the fixed portion 10 relative to the first movable side wall 21 and the second movable side wall 23 of the movable portion 20 are defined as the first fixed side wall 11 and the second fixed side wall 13. The pressure block 50, the pre-pressure member 40, and the piezoelectric actuator 30 are located on the first fixed side wall 11 of the fixed portion 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 portion 20. 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-pressure member 40 is disposed on the top of the piezoelectric active portion 31 of the piezoelectric actuator 30, and the pressure block 50 is located on the top of the pre-pressure member 40. The first support 61 is disposed between the bottom of the first movable sidewall 21 and the first fixed sidewall 11, and the second support 62 is located between the bottom of the second movable sidewall 23 and the second fixed sidewall 13.

[0082] In some embodiments of the support assembly of this application, the first support 61 is tightly clamped between the first fixed sidewall 11 of the fixed part 10 and the first movable sidewall 21 of the movable part 20, and the second support 62 is loosely clamped between the second fixed sidewall 13 of the fixed part 10 and the second movable sidewall 23 of the movable part 20.

[0083] Since the pre-pressure member 40 is only provided on the first movable side wall 21 of the movable part 20, the support force provided by the second support member 62 to the bottom of the second movable side wall 23 of the movable part 20 further balances the pre-pressure generated on the first movable side wall 21 of the movable part 20. On the one hand, it avoids excessive friction caused by the surface contact between the movable part 20 and the fixed part 10, which would result in poor driving effect. On the other hand, the provision of the second support member 62 helps to improve the parallelism of the movable part 20 when it moves, further improving the stability of the optical lens 100 and enhancing the imaging quality of the camera module.

[0084] It is understood that the first support portion 61 is tightly fitted and abuts against both the fixed portion 10 and the movable portion 20, while the second support portion 62 is loosely fitted between the fixed portion 10 and the movable portion 20. Therefore, a certain gap exists between the fixed portion 10 and / or the movable portion 20 on one side of the second support portion 62. This gap provides a certain amount of pre-set space for adjusting the position of the movable portion 20. In other words, when the movable portion 20 is driven by the piezoelectric actuator 30, the first support portion 61 always provides stable support for the movable portion 20 to ensure the parallelism of the movable portion 20 during movement. When the movable portion 20 tilts, the gap at the second support portion 62 provides a certain amount of leeway for adjusting the position of the movable portion 20. Furthermore, when the movable portion 20 tilts to a certain extent, abutting against the fixed portion 10 and the movable portion 20 can correct the movement state of the movable portion 20, preventing further tilting and thus avoiding affecting the driving performance due to the tilt of the movable portion 20. Furthermore, this arrangement facilitates assembly; a tight fit is beneficial for the installation and positioning of the movable part 20, while a loose fit allows for easy adjustment of the movable part 20, further reducing assembly tolerances and improving the assembly accuracy of the camera module. It should be understood that in this application, the situations in which the movable part 20 tilts include: tilting where the movable part 20 tends to rotate around the optical axis, tilting where the movable part 20 tends to rotate around a first direction, and tilting where the movable part 20 is driven to rotate around a second direction.

[0085] In some embodiments, the first support portion 61 and the second support portion 62 may also be tightly fitted and abutted between the fixed portion 10 and the movable portion 20, so that the first support portion 61 and the second support portion 62 can always provide stable support to the movable portion 20, thereby ensuring the parallelism of the movable portion 20 when it moves and reducing the risk of the movable portion 20 tilting.

[0086] 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 does 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.

[0087] 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, which 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 installed 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 accommodating groove 113. 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. 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.

[0088] In some embodiments of this application, the guide groove includes a first guide groove 111 located on the first fixed sidewall 11 and a second guide groove 211 located on the first movable sidewall 21, and the first support portion 61 is disposed between the first guide groove 111 and the second guide groove 211. Similarly, the support groove includes a first support groove 131 located on the second fixed sidewall 13 and a second support groove 231 located on the second movable sidewall 23, and the second support portion 62 is disposed between the first support groove 131 and the second support groove 231.

[0089] In some embodiments of this application, the friction part 22 is provided with a friction plate 221, the movable part 20 includes the opposing first movable sidewall 21 and the second movable sidewall 23, the preload member 40, the friction head 32 and the friction plate 221 are sequentially located at the top of the first movable sidewall 21 along the second direction, and the first support part 61 is located at the bottom of the first movable sidewall 21, so as to concentrate the preload and support force on the first movable sidewall 21 as much as possible, so as to accurately reduce the overturning moment.

[0090] In this configuration, the projections of the pre-pressure component 40, the friction head 32, the friction plate 221, and the first support portion 61 along the second direction overlap, with the second direction perpendicular to the optical axis. By arranging multiple overlapping projections of the pre-pressure component 40, the friction head 32, the friction plate 221, and the first support portion 61 along the second direction, the relative positions of these components in the first direction and the optical axis are further restricted. This ensures that the pre-pressure action range falls within the support range of the first support portion 61, thereby improving the stability of the movable part 20.

[0091] The fixing part 10 further includes a first fixing sidewall 11, a second fixing sidewall 13, and a fixing body 12. The first fixing sidewall 11 and the second fixing sidewall 13 are respectively disposed opposite to each other on both sides of the fixing body 12 along a second direction. The first receiving groove 112 and the second receiving groove 113 are formed in the first fixing sidewall 11 along the second direction, such that the pressure block 50 abuts against the top side of the first fixing sidewall 11. The first guide groove 111 and the first support groove 131 are respectively disposed in the first fixing sidewall 11 and the second fixing sidewall 13. The first support 61 is mounted on the first guide groove 111 and supports the first movable sidewall 21 of the movable part 20. The second support 62 is mounted on the first support groove 131 and supports the second movable sidewall 23 of the movable part 20. The arrangement of the first support 61 and the second support 62 reduces the frictional resistance experienced by the movable part 20 when it is driven to move, which is beneficial to improving the driving performance within the camera module. The first guide groove 111 and the first support groove 131 are flush with each other on both sides of the fixed part 10 along the first direction, so that the first support 61 and the second support 62 are relatively flush with each other along the first direction, providing stable support for the movable part 20. Further, as... Figure 4 , Figure 16 and Figure 17 As shown, since the piezoelectric actuator 30 drives the movable part 20 from the top, the first support 61 and the second support 62, flush with the bottom of the movable part 20, are sufficient to provide stable support. This further enhances the stability of the movable part 20 when driven along the optical axis. In other words, when the piezoelectric actuator 30 drives the movable part 20, the support is positioned at the bottom of the movable part 20 opposite to the side where the piezoelectric actuator 30 is located, thus clamping the movable part 20 between the piezoelectric actuator 30 and the support, preventing the movable part 20 from tilting during the driving process. Furthermore, there is no need to provide additional support on the side or top of the movable part 20, thereby reducing the number of support components in the camera module, optimizing the assembly process, reducing assembly tolerances, and increasing assembly consistency.

[0092] Specifically, since the movable part 20 moves along the optical axis, a first support part 61 and a second support part 62 are provided between the movable part 20 and the fixed part 10 to support the movable part 20's own weight. To further maintain the stability of the optical lens 100, the first support part 61 and the second support part 62 are arranged as close as possible along the first direction relative to the optical axis on both sides of the bottom of the movable part 20 to provide as symmetrical support force as possible for the movable part 20, thereby reducing the risk of the movable part 20 tilting.

[0093] It is understandable that since the second movable sidewall 23 does not have components such as the piezoelectric actuator 30, its length along the optical axis does not need to be increased. In other words, 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, which helps to increase the compactness of the drive device structure and further reduce the weight of the movable part 20 and the size of the drive device. The piezoelectric actuator 30 and the pre-pressure member 40 are arranged on the top side of the first movable sidewall 21. On the one hand, this makes the internal space of the camera module more rationally utilized. This is because the piezoelectric actuator 30 and the pre-pressure member 40 both extend along the optical axis, and the corresponding first movable sidewall 21 of the movable part 20 also needs to extend along the optical axis. That is to say, the first movable sidewall 21 needs to have a certain length to increase the drive stroke of the piezoelectric actuator 30. Furthermore, by placing the first support 61 on the bottom surface of the first movable sidewall 21, a longer space can be provided for the first support 61, thus offering a larger support area. Conversely, since the piezoelectric actuator 30 does not need to be placed on one side of the second movable sidewall 23, a shorter length can be provided to offer sufficient space for the second support 62. This not only enhances the structural compactness of the lens drive device but also helps reduce its size. Furthermore, since the optical focusing stroke in the periscope camera module is relatively large, this design also helps the first support 61 and the second support 62 to consistently provide stable support to the movable part 20 during the long stroke. Because the optical focusing stroke in the camera module is relatively large, this design helps ensure that the support parts always effectively support the movable part 20 during the long stroke.

[0094] like Figure 8 As 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 fitted inside the second guide groove 211, and the second support portion 62 is fitted 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.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] Furthermore, since the support structure is assembled inside the guide groove or support groove, as the distance between the two second guide grooves 211 increases, the distance between the two support parts of the first support part 61 assembled in the two second guide grooves 211 also increases, thereby 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.

[0101] In some embodiments, 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.

[0102] In some embodiments, the first support portion 61 and the second support portion 62 each include two balls for providing a stable supporting force to the movable portion 20. Further, each ball is disposed within a single pair of guide grooves to avoid interference between the two balls. It is understood that the greater the distance between the two balls spaced apart along the optical axis in the first support portion 61 and the second support portion 62, the more stable the supporting force provided to the movable portion 20, further enhancing the stability and reliability of the optical lens 100. When the distance between the two balls in the first support portion 61 is greater than the distance between the two balls in the second support portion 62, the area of ​​the support surface formed by the support portions increases, thereby increasing the stability of the optical lens 100.

[0103] In some embodiments, the projection of the friction head 32 of the piezoelectric actuator 30 along the second direction overlaps with the projection of the line connecting the first support portion 61 along the second direction, further reducing the overturning moment value and reducing the risk of the moving part 20 overturning.

[0104] In some embodiments, 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 of the piezoelectric actuator 30 is smaller than the distance between the two supports of the first support part 61, which helps to reduce the deviation of the preload and further makes the preload evenly distributed on the two supports of the first support part 61, reducing wear and damage to the first support part 61 caused by uneven preload. Furthermore, when the piezoelectric active part 31 causes the friction head 32 to move by generating vibration deformation, the angle of contact between the friction head 32 and the movable part 20 changes with the movement. This causes the force generated between the friction head 32 and the movable part 20 to not always be parallel to the optical axis. The direction of the force may have a certain tilt angle relative to the plane where the first movable sidewall 21 of the movable part 20 is located. In this case, the tilted force may further cause the movable part 20 to tilt. Therefore, the larger the distance between the two support parts of the first support part 61, the larger the support area of ​​the movable part 20 can be, thereby reducing the overturning moment value and further reducing the risk of the movable part 20 tilting.

[0105] In some embodiments, the imaginary line of the direction of the pre-pressure applied to the movable part 20 intersects with the line connecting the first support part 61, which helps to reduce the overturning moment value and further reduce the risk of the movable part 20 tilting.

[0106] In some embodiments, the position of the friction head 32 of the piezoelectric actuator 30 acting on the first movable sidewall 21 is aligned with the cross-sectional center of the first support portion 61 in a second direction. This arrangement facilitates the stable and direct application of pre-pressure by the pre-pressure member 40 onto the first support portion 61, increasing the stability of pre-pressure transmission and reducing errors caused by misalignment of components, thereby improving the reliability of the camera module. Furthermore, this alignment helps reduce excessive local wear on the first support portion 61, extending the service life of the camera module while reducing the overturning moment value, further reducing the risk of tilting of the optical lens 100.

[0107] In some embodiments, reference Figures 8 to 10The first support portion 61 and the second support portion 62 are components that can be independently formed relative to the movable portion 20 and the pressure block 50. Further, the first support portion 61 can be a multi-point structure spaced apart along the optical axis, such as a ball bearing or a slider. The second support portion 62 can be a multi-point structure or a guide rail structure spaced apart along the optical axis, such as a ball bearing, a slider, or a guide rod. When a guide rod is used as a support portion, its better linearity can increase the stability and reliability of the movable portion 20 when it is driven to move, further reducing the tilting or overturning phenomenon of the optical lens 100. Specifically, the second support groove 231 on which the second support portion 62 is mounted can be trapezoidal, rectangular, or V-shaped, etc.

[0108] It is understandable that when the first support 61 uses ball bearings as its support structure and the second support 62 uses a guide rod as its support structure, the downward pressure along the second direction exerted on the second support 62 is mainly the magnetic attraction force provided by the magnetic attraction component 70, which is less than the pressure exerted on the first support 61. The pressure exerted on the first support 61 includes the magnetic attraction force provided by the magnetic attraction component 70 and the preload provided by the preload member 40. This reduces the frictional force generated by the surface contact of the second support 62, thereby reducing the power consumption of the piezoelectric actuator 30. On the other hand, if the first support 61 uses a guide rod as its support structure, the large frictional force generated by the surface contact of the guide rod structure, which has a large coefficient of friction, due to the large pressure, will affect the driving effect of the piezoelectric actuator 30. It is understandable that when ball bearings are used as the support structure, the ball bearings contact the guide rail and guide groove using point contact, resulting in minimal rolling friction and large sliding friction, which is beneficial for the driving of the moving part 20.

[0109] In some embodiments, the first support portion 61 and the second support portion 62 are configured as hemispherical structures fixed to the fixed portion 10 and / or the movable portion 20, or they may be bosses. Using point contact friction helps to reduce wear on the guide groove and support groove and extend the service life of the camera module.

[0110] As mentioned above, in some embodiments of the support portion of this application, both the first support portion 61 and the second support portion 62 use ball bearings as the support structure. The number of ball bearings arranged on the same side as the piezoelectric actuator 30 is greater than the number of ball bearings arranged on the opposite side of the piezoelectric actuator 30. For example, the number of support ball bearings 601 in the first support portion 61 is greater than the number of support ball bearings 601 in the second support portion 62. Through the synergistic effect of the asymmetrical ball bearing layout and the driving position of the piezoelectric actuator 30, the risk of the driving device overturning is reduced, and the risk of the ball bearings becoming dented or stuck is also reduced, thereby improving the reliability and stability of the driving device.

[0111] Since the piezoelectric actuator 30 drives the top of the first movable sidewall 21, the pressure block 50 is located on top of the pre-pressure member 40, which generates a pre-pressure force parallel to the second direction, pointing towards the first support portion 61 located at the bottom of the first movable sidewall 21. By adjusting the magnitude of the pre-pressure force, the force on the first support portion 61 is made greater than the force on the second support portion 62 located on the second movable sidewall 23, thereby reducing the overturning moment of the first movable sidewall 21 and ensuring the stability and reliability of the drive device.

[0112] To address the aforementioned issues, the first support portion 61 has a greater number of balls. On one hand, this significantly increases the effective support area on the same side as the piezoelectric actuator 30, providing more stable support for the movable portion 20. On the other hand, more balls can work together to distribute the preload, especially in drop or impact scenarios, where multiple balls can disperse the impact force and significantly suppress the formation of dents on the contact surface.

[0113] Furthermore, the length of the guide groove is designed to be as long as possible. Specifically, a through guide groove is provided at the bottom of the first movable sidewall 21 to accommodate multiple balls of the first support part 61, thereby increasing the movable space of the first support part 61 and the flexibility of the balls' movement, reducing the risk of sliding friction and jamming, and thus meeting the long-stroke movement requirements of the movable part 20.

[0114] Furthermore, the first support portion 61 is configured with a structure of balls of different sizes, that is, the first support portion 61 includes at least two support balls 601 and at least one small ball 602, wherein all the support balls 601 are of the same size, and the small ball 602 is smaller than the size of the support balls 601.

[0115] like Figure 11 and Figure 16As shown, the first support portion 61 is implemented as including two support balls 601 at the beginning and end and at least one small ball 602 located between them. The second support portion 62 is implemented as one support ball 601. Each of the three support balls 601 provides a support contact point at the bottom of the movable portion 20, and the three support balls 601 form a triangular effective support surface with the minimum number of support balls 601, improving the stability of the support. Specifically, in the first support portion 61 at the bottom of the first movable sidewall 21, at least one small ball 602 fills the gap between the two support balls 601 along the optical axis, extending the side support line and adjusting the spacing between the two support contact points to optimize the contact point distribution. This also improves the movement state of the two support balls 601 during driving, reduces sliding wear, and improves the stability of the drive device. When the drive device falls or collides, the small ball 602 can disperse the impact force to prevent the support balls 601 from developing dents due to concentrated force, thus improving the reliability of the drive device.

[0116] In some embodiments, the second support portion 62, which is disposed on the opposite side of the piezoelectric actuator 30, is implemented as consisting of two support balls 601 and a plurality of small balls 602 disposed between the two support balls 601. The total length of all the balls in the second support portion 62 is less than the total length of all the balls in the first support portion 61, so as to form a larger effective support surface and provide more stable support for the moving part 20 in a drive device with a large unilateral preload driving force.

[0117] In some embodiments of the guide grooves and support grooves of this application, the first movable sidewall 21 has one second guide groove 211, and the second movable sidewall 23 has one second support groove 231. The first guide groove 111 extends through the bottom of the first movable sidewall 21 along the optical axis, and the first support groove 131 extends through 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 larger length of the second guide groove 211 along the optical axis allows for the accommodation of more support balls 601 of the first support portion 61 within the second guide groove 211, thereby increasing the support area formed by the line connecting the first support portion 61 and the second support portion 62, and reducing the risk of tilting of the movable portion 20 during movement.

[0118] Furthermore, in this modified embodiment, such as Figure 16As 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.

[0119] 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.

[0120] 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 multiple balls that make up a support part are set in one groove.

[0121] In some embodiments of this application, the support ball 601 of the first support portion 61 is tightly fitted into the guide groove, and the support ball 601 of the second support portion 62 is loosely fitted into the support groove. Specifically, the support ball 601 of the first support portion 61 is tightly clamped between the first guide groove 111 and the second guide groove 211 to provide support and guidance for the first movable sidewall 21 where the piezoelectric actuator 30 is located. The support ball 601 of the second support portion 62 is loosely clamped between the first support groove 131 and the second support groove 231. While the first support portion 61 serves as the main support component and maintains the basic support function, it also provides a certain degree of tilting buffer flexibility for the movable portion 20 during movement, ensuring the stability of the movable portion 20 during operation.

[0122] It is understandable that the length of the ball groove directly affects the movement space and flexibility of the ball within the ball groove, and even the travel distance of the moving part 20. Therefore, the length of the guide groove is greater than the length of the support groove. The tightly fitted balls are placed in the longer guide groove, and the loosely fitted balls are placed in the shorter support groove, so as to provide more movement space for the tightly fitted balls. The tightly fitted balls are also more flexible, which can reduce the risk of sliding friction of the tightly fitted balls and reduce friction.

[0123] Specifically, the guide groove is implemented as a V-shaped groove to tightly clamp the support ball 601 of the first support part 61, so that the support ball 601 of the first support part 61 makes point contact with the guide groove under pre-pressure, thereby reducing the frictional resistance of the first support part 61 during the movement of the movable part 20 by point contact; the support groove can be implemented as a U-shaped groove to loosely clamp the support ball 601 of the second support part 62, providing a basic clamping effect while providing a larger movement space for the support ball 601 of the second support part 62, and preventing the movable part 20 from jamming when tilted.

[0124] More specifically, both the guide groove and the support groove are closed grooves, reducing the probability of external debris entering the ball groove and affecting the rolling of the balls. This ensures that all balls can roll normally in the ball groove, guaranteeing the smooth movement of the movable part 20 within the fixed part 10. It also prevents the balls from detaching from the groove, thus affecting the reliability of the drive device.

[0125] In some embodiments, the driving device further includes an insert disposed on the abutting surface between the first guide groove 111 and the first support portion 61, providing a flatter support surface for the first support portion 61. Further, the insert of the first guide groove 111 has the same shape as the first guide groove 111. For example, if the first guide groove 111 is a V-shaped groove, the insert can also be V-shaped; if the first guide groove 111 is a U-shaped groove, the insert can also be U-shaped; or, the insert can also be planar. On the one hand, this helps to reduce wear on the first support portion 61 when it moves inside the first guide groove 111, extending the service life of the first support portion 61; it also reduces the risk of the first support portion 61 jamming during use, further improving the quality and lifespan of the camera module. On the other hand, it reduces deformation phenomena such as pitting of the first support portion 61 caused by excessive force under pre-pressure, further enhancing the reliability of the camera module.

[0126] In some embodiments, the driving device further includes an insert that lies flat on the abutting surface of the first support groove 131 and the second support portion 62 to enhance the support for the second support portion 62. The insert of the first support groove 131 has the same shape as the first support groove 131. For example, if the first support groove 131 is a V-shaped groove, the insert can also be V-shaped; if the first support groove 131 is a U-shaped groove, the insert can also be U-shaped; or, the insert can also be planar. This insert structure helps to reduce wear on the second support portion 62 when it moves inside the first support groove 131, extending its service life. It also reduces the risk of the second support portion 62 jamming during use, further improving the quality and lifespan of the camera module.

[0127] In some embodiments, the contact surfaces of the second guide groove 211 and the second support groove 231 in the movable part 20 with the support structure are also provided with insert structures. That is, the first support part 61 contacts the insert in the second guide groove 211 and the insert in the first guide groove 111, respectively, and the second support part 62 contacts the insert in the second support groove 231 and the insert in the first support groove 131, respectively. The provided insert structures reduce wear on the first support part 61 when it moves between the first guide groove 111 and the second guide groove 211, and reduce wear on the second support part 62 when it moves between the first support groove 131 and the second support groove 231, further improving the quality and lifespan of the camera module. On the other hand, they also reduce deformation phenomena such as dents in the first support part 61 and the second support part 62 caused by excessive force, further enhancing the reliability of the camera module.

[0128] Furthermore, the insert can also be positioned in the guide groove and support groove in the same manner as described above to achieve a similar function, which will not be elaborated further here.

[0129] In one embodiment, the first support portion 61 has at least three balls, including at least two support balls 601 and at least one small ball 602. For example, the number of support balls 601 is 2, and the number of small balls 602 is greater than 3 and less 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 should be understood that the more small balls 602 there are, the greater the distance between two support balls 601, and the larger the support area. However, if the number of small balls 602 is too large, the larger the space occupied in the guide groove, the smaller the space for the support balls 601 to move, affecting the rolling of the support balls 601.

[0130] In some embodiments of this application, the movable part 20 further includes a friction part 22, which is disposed on the first movable sidewall 21 of the movable part 20 and faces the side where the friction head 32 is located. Thus, the friction head 32 of the piezoelectric actuator 30 is frictionally coupled to the friction part 22 by the pre-pressure action of the pre-pressure member 40. It is understood that the friction part 22 provided in this application helps to increase the friction 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.

[0131] Specifically, the friction part 22 is implemented as a friction plate 221, which is a separate structure from the movable part 20. It is attached to the first movable sidewall 21 of the movable part 20 by an adhesive. While achieving frictional contact with the friction head 32, it improves the controllability of the friction condition. Moreover, the separate structure reduces the difficulty of manufacturing and maintenance, which is conducive to improving the service life of the camera module.

[0132] In some embodiments, the friction plate 221 may also be integrally formed on the first movable sidewall 21 of the movable part 20.

[0133] 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.

[0134] refer to Figure 2 and Figure 16As 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 downward pressure provided by the pressure block 50 in the second direction, 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 within the fixed part 10. The direction of the pre-pressure 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.

[0135] 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.

[0136] In this application, the piezoelectric actuator 30 has at least one friction head 32 to provide sufficient driving force to the movable part 20 so as to ensure that the movable part 20 moves along the optical axis under the action of the driving force.

[0137] like Figure 16 As shown, at least a portion of the friction plate 221 is in frictional contact with the friction head 32 of the piezoelectric actuator 30, meaning that the total length of the friction plate 221 is greater than the length of the working area of ​​the friction head 32 of the piezoelectric actuator 30. This ensures that the friction head 32 and the friction plate 221 maintain frictional contact throughout the movement of the movable part 20. At the same time, the length of the friction plate 221 can adapt to the slight offset of the friction head 32, absorbing displacement deviations caused by assembly tolerances or vibrations, ensuring a tight fit of the contact surfaces, thereby ensuring the continuous transmission of driving force.

[0138] In some embodiments of the pre-compression and support ranges of this application, the projection of the friction plate 221 along the second direction overlaps with the line connecting the farthest endpoints of the two guide grooves. The friction plate 221 is in frictional contact with the friction head 32. The imaginary line of the direction of the pre-compression force on the movable part 20 passes sequentially through the friction head 32, the friction plate 221, and the guide groove. The guide groove contains the first support part 61. In particular, the second guide groove 211 of the first movable sidewall 21 is abutted and supported by the first support part 61. The support direction of the first support part 61 is opposite to the pre-compression direction, so that the movable part 20 can always be supported by a certain force, reducing the overturning moment value and reducing the risk of the movable part 20 tilting.

[0139] Specifically, the projection of the friction plate 221 along the second direction overlaps with the line connecting the two support balls 601 of the first support portion 61, so that the first movable sidewall 21 can be supported by the support balls 601 of the first support portion 61 throughout the entire movement stroke, including at the extreme position, further reducing the risk of the movable portion 20 tilting.

[0140] More specifically, the projection of the friction head 32 along the second direction overlaps with the projection of the line connecting the first and last support balls 601 of the first support part 61 along the second direction, so that the projection of the friction contact position between the friction head 32 and the first movable sidewall 21 along the second direction always falls on the line connecting the support balls 601 of the first support part 61, so as to ensure that the first movable sidewall 21 can be supported by the first support part 61 throughout the entire movement stroke, including the extreme position, and prevent the movable part 20 from overturning.

[0141] Furthermore, the projection of the friction head 32 along the second direction is covered by the projection of the guide groove along the second direction. The guide groove accommodates a plurality of support balls 601 of the first support portion 61. By utilizing the abutment of the plurality of support balls 601 against the second guide groove 211 of the first movable sidewall 21, a supporting force opposite to the pre-pressure direction is provided to the first movable sidewall 21. This ensures that the projection of the pre-pressure action position along the second direction falls within the supporting range of the plurality of support balls 601 of the first support portion 61, thereby reducing the risk of the movable portion 20 tilting.

[0142] In some embodiments, along the optical axis, the length of the friction plate 221 is less than the length of the guide groove disposed on the same side as the piezoelectric actuator 30, but greater than the length of the support groove disposed on the opposite side of the piezoelectric actuator 30. That is, the length of the friction plate 221 is less than the length of the second guide groove 211, but greater than the length of the second support groove 231. This is to accommodate the pre-pressure applied by the pre-pressure drive assembly and to provide driving force through frictional contact. At the same time, it avoids the friction plate 221 being too short, which would affect the movement stroke. Meanwhile, the friction plate 221 is disposed on the same side as the longer guide groove, which, together with the pre-pressure drive assembly on that side and the first support part 61 tightly clamped in the guide groove, helps the camera module to achieve a larger movement stroke and reduces the risk of tipping over of the movable part 20.

[0143] The diameter difference between the support ball 601 and the small ball 602 shall not exceed 0.2 mm to avoid the ball diameter difference being too large, which would cause the rolling trajectory of the ball on the track to be inconsistent, thereby reducing the impact on rolling friction stability. At the same time, it prevents the ball from moving asynchronously due to the large difference in ball diameter, and effectively prevents the movable part 20 from tilting.

[0144] On the side where the first movable sidewall 21 of the movable part 20 and the first fixed sidewall 11 of the fixed part 10 are located, the friction head 32 of the piezoelectric actuator 30 is located on and in frictional contact with the friction plate 221 of the movable part 20. Two support balls 601 and a plurality of small balls 602 therein are located in the guide groove, and the two support balls 601 abut against the top wall of the guide groove. Figures 18 to 25 As shown, when the movable part 20 moves to its limit position, the multiple support balls 601 of the first support part 61 are concentrated at one end of the guide groove along the optical axis. At this time, if the projection of the pre-pressure action range generated by the pre-pressure member 40 through the friction head 32 along the second direction does not overlap with the first support part 61 in part or in whole, the movable part 20 will have the risk of tipping over under the action of the pre-pressure.

[0145] In this application, the piezoelectric actuator 30 includes at least one friction head 32, which makes frictional contact with the friction plate 221 and drives the movable part 20 to move along the optical axis.

[0146] In some embodiments of this application, the movable part 20 includes an incident light side and an exit light side, the incident light side and the exit light side being located on opposite sides of the movable part 20 along the optical axis, such as... Figures 18 to 21As shown, when the movable part 20 moves to its limit position to one side, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the other side of the movable part 20. The minimum spacing between the plurality of support balls 601 is not less than the maximum distance from the at least one friction head 32 to the friction plate 221 near the other side of the movable part 20, so that the movable part 20 is still stably supported by the first support part 61 at the limit position, and avoids that the pre-pressure member 40 does not receive sufficient support at the limit position through the pre-pressure action applied by the friction head 32, thus preventing the movable part 20 from overturning at the limit position.

[0147] Specifically, when the movable part 20 moves towards the light-incident side to its limit position, the plurality of support balls 601 of the first support part 61 are concentrated at one end of the guide groove near the light-incident side. The minimum spacing between the plurality of support balls 601 tightly arranged is not less than the maximum distance from the at least one friction head 32 to the friction plate 221 near the light-incident side.

[0148] In some embodiments, the friction head 32 is a single friction head 32. When the movable part 20 moves to one side to its limit position, the distance from the friction head 32 to the end of the friction plate 221 near the other side of the movable part 20 is D1. The plurality of support balls 601 of the first support part 61 are compacted in the guide groove near the other side of the movable part 20. The distance between the plurality of support balls 601 is D2, D1≤D2, so as to ensure that the movable part 20 can still be stably supported when it moves to the limit position, thereby reducing the risk of overturning at the limit position.

[0149] Specifically, such as Figure 18 As shown, when the movable part 20 moves towards the light-incident side to its limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-emitting side, and the minimum spacing between the plurality of support balls 601 tightly arranged is not less than the distance from the friction head 32 to the end of the friction plate 221 near the light-emitting side; Figure 19 As shown, when the movable part 20 moves toward the light-emitting side to the limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-incident side. The minimum spacing between the plurality of support balls 601 tightly arranged is not less than the distance from the friction head 32 to the end of the friction plate 221 near the light-incident side.

[0150] In some embodiments, the friction head 32 is a double friction head 32. When the movable part 20 moves to its limit position towards one side, the distance from the friction head 32 near that side of the movable part 20 to the end of the friction plate 221 near the other side of the movable part 20 is D1. The plurality of support balls 601 of the first support part 61 are compacted in the guide groove near the end of the movable part 20 on the other side. The distance between the plurality of support balls 601 is D2, D1≤D2, so as to ensure that the movable part 20 can still be stably supported when it moves to the limit position, thereby reducing the risk of overturning at the limit position.

[0151] Specifically, such as Figure 20 As shown, when the movable part 20 moves towards the light-incident side to its limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-emitting side. The minimum spacing between the plurality of support balls 601 tightly arranged is not less than the maximum distance from the friction head 32 near the light-incident side to the end of the friction plate 221 near the light-emitting side; Figure 21 As shown, when the movable part 20 moves toward the light-emitting side to the limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at the end of the guide groove near the light-incident side. The minimum spacing between the plurality of support balls 601 is not less than the maximum distance from the friction head 32 near the light-emitting side to the end of the friction plate 221 near the light-incident side.

[0152] In other words, regardless of which direction the movable part 20 moves, and regardless of whether it is a single friction head 32 or a double friction head 32, at the extreme position, the projection of the contact position between the friction head 32 and the friction plate 221 overlaps with the projection of the multiple support balls 601 of the first support part 61. That is, during the movement of the movable part 20, the friction head 32 and its contact position are supported by the first support part 61.

[0153] It should be understood that in the above situation, the movement direction of the movable part 20 is opposite to the movement direction of the first support part 61. Since the movement of the ball in the guide groove is uncontrollable, it is also possible for a situation to occur that is the opposite of the above state, that is, the movement direction of the movable part 20 is the same as the movement direction of the first support part 61, such as... Figures 22 to 25 As shown, when the movable part 20 moves to its limit position to one side, the plurality of support balls 601 of the first support part 61 are concentrated at one end of the guide groove near the side of the movable part 20. The minimum spacing between the plurality of support balls 601 is not less than the maximum distance from the at least one friction head 32 to the end of the friction plate 221 near the side of the movable part 20.

[0154] Specifically, when the movable part 20 moves towards the light-incident side to its limit position, the plurality of support balls 601 of the first support part 61 are concentrated at one end of the guide groove near the light-incident side, and the minimum spacing between the plurality of support balls 601 tightly arranged is not less than the maximum distance from the at least one friction head 32 to the friction plate 221 near the light-incident side. When the movable part 20 moves towards the light-exiting side to its limit position, the plurality of support balls 601 of the first support part 61 are concentrated at one end of the guide groove near the light-exiting side, and the minimum spacing between the plurality of support balls 601 tightly arranged is not less than the maximum distance from the at least one friction head 32 to the friction plate 221 near the light-exiting side.

[0155] In some embodiments, the friction head 32 is a single friction head 32. When the movable part 20 moves to one side to its limit position, the distance from the friction head 32 to the end of the friction plate 221 near the side of the movable part 20 is D1. The plurality of support balls 601 of the first support part 61 are compacted in the guide groove near the end of the movable part 20. The distance between the plurality of support balls 601 is D2, D1≤D2, so as to ensure that the movable part 20 can still be stably supported when it moves to the limit position, thereby reducing the risk of the movable part 20 overturning at the limit position.

[0156] Specifically, such as Figure 22 As shown, when the movable part 20 moves towards the light-incident side to its limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-incident side, and the minimum spacing between the plurality of support balls 601 tightly arranged is not less than the distance from the friction head 32 to the end of the friction plate 221 near the light-incident side; Figure 23 As shown, when the movable part 20 moves toward the light-emitting side to the limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-emitting side, and the minimum spacing between the plurality of support balls 601 tightly arranged is not less than the distance from the friction head 32 to the end of the friction plate 221 near the light-emitting side.

[0157] In some embodiments, the friction head 32 is a double friction head 32. When the movable part 20 moves to its limit position toward one side, the distance from the friction head 32 near the other side of the movable part 20 to the end of the friction plate 221 near the side of the movable part 20 is D1. The plurality of support balls 601 of the first support part 61 are compacted in the guide groove near the end of the movable part 20. The distance between the plurality of support balls 601 is D2, D1≤D2, so as to ensure that the movable part 20 can still be stably supported when it moves to the limit position, thereby reducing the risk of overturning at the limit position.

[0158] Specifically, such as Figure 24As shown, when the movable part 20 moves towards the light-incident side to its limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-incident side. The minimum spacing between the plurality of support balls 601 tightly arranged is not less than the maximum distance from the friction head 32 near the light-emitting side to the end of the friction plate 221 near the light-incident side; Figure 25 As shown, when the movable part 20 moves toward the light-emitting side to the limit position, the plurality of support balls 601 of the first support part 61 are concentratedly arranged at one end of the guide groove near the light-emitting side. The minimum spacing between the plurality of support balls 601 is not less than the maximum distance from the friction head 32 near the light-incident side to the friction plate 221 near the light-emitting side.

[0159] In some embodiments, the maximum distance from the at least one friction head 32 to one end of the friction plate 221 is not less than the mechanical stroke of the movable part 20, ensuring that the movement range of the movable part 20 driven by the piezoelectric actuator 30 covers the mechanical stroke of the movable part 20, preventing the friction head 32 from exceeding the length range of the friction plate 221 and rubbing against other structures at the extreme position, and avoiding the friction between the friction head 32 and structures other than the friction plate 221 from affecting the effect of friction drive.

[0160] In this application, as Figures 8 to 10 , Figure 17 As shown, the driving device further includes a magnetic attraction assembly 70, which includes a first magnetic attraction member 71 and a second magnetic attraction member 72. The first magnetic attraction member 71 is disposed on the main body of the fixed part 10, and the second magnetic attraction member 72 is disposed on the bottom of the movable part 20. The first magnetic attraction member 71 and the second magnetic attraction member 72 are disposed opposite each other along a second direction and interact to generate a magnetic attraction force. Along the first direction, the distance from the second magnetic attraction member 72 to the second support part 62 is less than the distance from the second magnetic attraction member 72 to the first support part 61, and the magnetic attraction force and the preload are in the same direction. Specifically, the second magnetic attraction member 72 is disposed on the second movable sidewall 23 in the movable part 20, and the first magnetic attraction member 71 is disposed on the second fixed sidewall 13 in the fixed part 10. The first magnetic attraction member 71 and the second magnetic attraction member 72 are disposed opposite each other along the second direction and generate a magnetic attraction force through interaction. Since the direction of the magnetic attraction force is the same as the direction of the preload, the preload and the magnetic attraction force are superimposed. When the magnetic attraction force is insufficient to resist external forces, the preload can provide additional support. Furthermore, since the magnetic attraction component 70 is located at the bottom of the movable part 20 and the piezoelectric actuator 30 is located on the top side of the movable part 20, the movable part 20 can be supported by providing a support part only at the bottom, further reducing the number of support parts required in the camera module.

[0161] Understandably, since the magnetic suction component 70 is located at the bottom of the movable part 20, the first movable sidewall 21 is subjected to pre-pressure, and the movable part 20 tends to tilt. Therefore, a magnetic suction force is needed to reduce the risk of the movable part 20 tilting. The magnetic suction force and the pre-pressure force are in the same direction, along the first direction. The point of application of the magnetic suction force and the point of application of the pre-pressure force on the movable part 20 are located on opposite sides of the optical axis. This helps to ensure that the movable part 20 is tightly attached to the fixed part 10, enhancing the stability of the camera module. Furthermore, the magnetic suction force and the pre-pressure force work together to further balance the forces on the movable part 20, helping to reduce the tilting of the optical lens 100 caused by torque imbalance.

[0162] In some embodiments of this application, the second magnetic member 72 is disposed in the middle region between the two second support grooves 231 along the optical axis to reduce the overturning moment value and further reduce the risk of the movable part 20 tilting.

[0163] Specifically, such as Figure 10 and Figure 17 As shown, the first magnetic chuck 71 is a metal yoke. The first magnetic chuck 71 includes a base portion 711 and a support portion 712. At least a portion of the base portion 711's projection along the second direction overlaps with the projection of the second magnetic chuck 72 along the second direction, and at least a portion of the support portion 712's projection along the second direction overlaps with the projection of the second support portion 62 along the second direction. By providing the first magnetic chuck 71, on the one hand, the magnetic attraction is enhanced, the preload is better balanced, and the risk of the movable part 20 tipping over is reduced; on the other hand, the magnetic attraction allows the support portion to be stably clamped between the movable part 20 and the fixed part 10, improving the stability of the support portion and thus improving the imaging quality of the camera module.

[0164] In some embodiments of the first magnetic suction member 71 structure of this application, the base portion 711 and the support portion 712 of the first magnetic suction member 71 are integrally connected, improving the convenience of processing and increasing processing efficiency. Furthermore, the base portion 711 and the support portion 712 can be separate structures, which helps improve the flatness of the base portion 711; however, when the area of ​​the base portion 711 is too large, deformation is prone to occur.

[0165] In some embodiments of the shape of the support portion 712 in this application, the support portion 712 may be V-shaped or planar depending on the shape of the first guide groove 111 and the first support groove 131, and is located on the lower side of the first support portion 61 and / or the second support portion 62 along the second direction, so as to avoid the first support portion 61 and the second support portion 62 from generating pits, and further improve the quality of use and service life of the camera module.

[0166] Furthermore, one of the first magnetic attractor 71 and the second magnetic attractor 72 is a magnet, and the other is a magnet or yoke suitable for attracting the magnet. The magnet or yoke can be fixed by means of adhesion, insert injection molding, riveting, etc. Since the first movable sidewall 21 and the second movable sidewall 23 of the movable part 20 are respectively subjected to preload and magnetic attraction, and the direction of the magnetic attraction is the same as the direction of the preload, it helps to reduce the risk of the movable part 20 tilting. Specifically, the preload can be greater than the magnetic attraction, because when the magnetic attraction is too large, the frictional resistance that the movable part 20 needs to overcome when driving the movement will also be greater, further increasing the power consumption of the piezoelectric actuator 30, which is not conducive to the driving of the movable part 20.

[0167] In some embodiments, the first magnetic attractor 71 is a magnet, and the second magnetic attractor 72 is an insert-molded magnetic yoke. The magnetic yoke can also serve as a conductor 14 of the fixing part 10 to simplify the structure. Specifically, the magnetic yoke uses a metal strip design and is cut and formed after manufacturing; this mass production method can further improve production efficiency. Furthermore, the magnetic yoke used in this application has a large planar area; increasing the metal pressing area during manufacturing can increase the planar regularity. Furthermore, the magnetic yoke can be made of a material that attracts magnets, such as metal, to further enhance the magnetic attraction and thus improve the stability of the optical lens 100.

[0168] In some embodiments, the magnetic attraction assembly 70 further includes a first magnetic attraction member 71 and a second magnetic attraction member 72. The first magnetic attraction member 71 located on the movable part 20 and the second magnetic attraction member 72 disposed on the fixed part 10 interact 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 attraction assembly 70 can ensure that the movable part 20 is always supported by the support part during the long stroke of the movable part 20, and the movable part 20 will not tilt to a large extent. Furthermore, the magnetic attraction force generated by the magnetic attraction assembly 70 located on the second movable sidewall 23 is consistent with the direction of the pre-pressure generated by the pre-pressure member 40 on the first movable sidewall 21, which helps to improve the fit between the movable part 20 and the fixed part 10, further reducing the tilting phenomenon of the movable part 20 due to torque imbalance, and further reducing the risk of the optical lens 100 tilting.

[0169] In some embodiments, the piezoelectric actuator 30 further includes a conductive element 33 disposed between the piezoelectric active part 31 and the pre-pressing member 40, such as Figure 3As shown, the conductive element 33 includes a first connecting portion 331, a second connecting portion 333, and a conductive portion 334. The first connecting portion 331 is a horizontal plate disposed along a second direction between the piezoelectric active portion 31 and the pre-pressing member 40 of the piezoelectric actuator 30. The second connecting portion 333 is a vertical plate integrally bent along the second direction from the first connecting portion 331. The conductive portion 334 extends from the second connecting portion 333 along the outer peripheral wall of the fixing portion 10 in the optical axis direction and connects to a conductive member 14 provided on the fixing portion 10. Specifically, the first connecting portion 331 is a horizontal plate disposed along the second direction between the piezoelectric active portion 31 and the pre-pressing member 40 of the piezoelectric actuator 30. The first connecting portion 331 may have a through hole to reduce the influence of the conductive element 33 on the piezoelectric active portion 31. The second connecting part 333 is a vertical plate that is integrally bent along the second direction from the first connecting part 331, and the conductive part 334 is a conductive member 14 that extends from the second connecting part 333 along the outer peripheral wall of the fixing part 10 in the second direction and is connected to the fixing part 10.

[0170] refer to Figure 1 , Figure 4 and Figure 11 As shown, in some embodiments, the circuit components in the camera module, in addition to the flexible circuit board, also include a conductive member 14 disposed around the outer peripheral wall of the fixing part 10. Specifically, the conductive member 14 is embedded in or externally disposed on the first fixing side wall 11 and the second fixing side wall 13, with at least a portion of the conductive member 14 exposed on the outer peripheral side of the fixing part 10. The conductive member 14 has a conductive portion 141, and the conductive member 14 is welded to the extended end of the conductive member 33 through the conductive portion 141 to achieve electrical conduction. Furthermore, the conductive member 14 enables the conduction of the circuit portions of the photosensitive component 80, the light-shifting element 90, and other circuit modules through a simple electrical connection. For example, Figure 2 The conductor 14 with a bent structure shown is easy to connect and adapts to complex spatial layouts and shape requirements, further enabling efficient wiring design in narrow or irregular spaces, thereby improving space utilization.

[0171] In some embodiments, as Figure 2 , Figure 3 and Figure 11As described above, the piezoelectric actuator 30 includes the piezoelectric active part 31, the friction head 32, and the conductive element 33. Under pre-pressure, the piezoelectric actuator 30 abuts against the movable part 20. Specifically, the friction head 32 is disposed on the side of the piezoelectric active part 31 facing the first movable sidewall 21. The piezoelectric active part 31 generates mechanical resonant motion through the inverse piezoelectric effect. When the frequency of the applied voltage matches the natural frequency of the piezoelectric active part 31, resonance occurs, generating ultrasonic waves. Therefore, oscillating reciprocating motion or elliptical motion can be achieved on a specifically configured electrode layer, thereby driving the friction head 32 to perform oscillating reciprocating motion or elliptical motion. Furthermore, through the friction between the friction head 32 and the first movable sidewall 21, the movable part 20 is driven to slide relative to the fixed part 10.

[0172] refer to Figure 2 , Figure 3 and Figure 11 It is understood that in some embodiments, the piezoelectric actuator 30 further includes a buffer 34 disposed between the preload member 40 and the piezoelectric active part 31. Since the elastic modulus of the buffer 34 is lower than that of the preload member 40, the buffer 34 is more prone to deformation. This allows it to adaptively generate different degrees of shrinkage deformation according to the different tolerances in the piezoelectric actuators 30, thereby reducing the preload difference between the various piezoelectric actuators 30 with different tolerances. In other words, the deformable buffer 34 can reduce at least part of the preload variation caused by material and assembly tolerances, and can also absorb some deformation of the piezoelectric active part 31. The buffer 34 can also absorb some vibration deformation of the piezoelectric active part 31 to stably maintain the parallelism of the piezoelectric active part 31 relative to the first movable sidewall 21, further protecting the piezoelectric actuator 30 from excessive mechanical stress.

[0173] It is understood that the buffer 34 can be an adhesive tape, with one side of its surface smoothly bonded to the pre-compression member 40, and the other side of its surface bonded to the piezoelectric active part 31 or a component below the piezoelectric active part 31. Furthermore, the adhesive tape is easy to install and use, requires no curing, and has good flatness, which helps maintain the parallelism of the piezoelectric active part 31 relative to the first movable sidewall 21. The size of the buffer 34 can be less than, equal to, or greater than the size of the piezoelectric active part 31, so that the buffer 34 fills the space between the piezoelectric active part 31 and the pre-compression member 40. Similarly, this application does not need to limit the specific shape and number of the buffer 34; for example, two pieces of adhesive tape can be stacked as the buffer 34, or two pieces of adhesive tape can be spaced apart along the second direction. Preferably, the size of the buffer 34 is larger than the size of the piezoelectric active part 31, so that the area between the piezoelectric active part 31 and the pre-compression member 40 is completely filled by the buffer 34, which helps to ensure the strength of the connection structure of the pre-compression member 40 and enhance the installation parallelism provided to the piezoelectric active part 31.

[0174] Specifically, the buffer 34 can also be a low-modulus adhesive disposed on the surface of the piezoelectric active part 31. In other words, since the buffer 34 can be attached between the pre-compression member 40 and the circuit board, it not only has the advantage of easy assembly, but also avoids the problem of affecting the vibration mode of the piezoelectric active part 31 after using adhesives such as UV glue or thermosetting glue to bond the pre-compression member 40.

[0175] like Figure 2 , Figure 3 and Figure 11 It is understood that in some embodiments, the piezoelectric active part 31 is a substrate utilizing the inverse piezoelectric effect, which contracts or expands according to changes in the polarization direction and the electric field direction. This effect means that when an electric field is applied in the polarization direction of the dielectric, the dielectric will undergo mechanical deformation, thereby enabling the piezoelectric active part 31 to achieve polarization by applying an electric field to materials such as single crystals, polycrystalline ceramics, and polymers, thereby generating ultrasonic oscillations. This oscillation can generate oscillating reciprocating motion or elliptical motion on a specifically configured electrode layer, thereby driving the friction head 32 to perform corresponding movements. It is understood that the frictional force between the friction head 32 and the outer wall of the movable part 20 can drive the movable part 20 to move relative to the fixed part 10; therefore, the driving force is actually the frictional force between the friction head 32 and the movable part 20.

[0176] In one specific embodiment of this application, the piezoelectric active part 31 adopts a multi-layer stacked structure. Specifically, the piezoelectric active part 31 is formed by alternating stacking of ceramic layers and electrode layers in the thickness direction, in the order of ceramic layer, electrode layer, ceramic layer, electrode layer... ceramic layer, electrode layer, ceramic layer. Each electrode layer is located between two adjacent ceramic layers. When an electric field is applied between adjacent electrode layers, the ceramic layer will undergo elongation or contraction deformation. By setting multiple electrode layers, the voltage required to drive the piezoelectric active part 31 to perform bending vibration 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 layers are usually made of materials with piezoelectric effect, such as PZT piezoelectric ceramics; while the electrode layers are made of conductive materials, such as copper, gold, silver, or silver alloys. The fixation between the multiple ceramic layers and the multiple electrode layers can be achieved by a ceramic co-firing process, that is, laying a layer of ceramic slurry, then laying a layer of electrode slurry, and then heating and sintering them together to form the stacked piezoelectric active part 31. Furthermore, by providing a power source to the multilayer electrode layers, the multilayer ceramic layers disposed between the multilayer electrode layers can be polarized.

[0177] It is understandable that the side electrical connection part in the camera module is connected to the positive voltage and negative voltage of the power supply respectively, thereby providing at least one electrode layer with positive voltage and at least one electrode layer with negative voltage, thereby polarizing the multilayer ceramic layer. The piezoelectric ceramics after polarization will automatically align in the piezoelectric direction, further generating the piezoelectric effect.

[0178] In some embodiments, to improve the driving performance of the piezoelectric actuator 30, the piezoelectric active part 31 may be made of piezoelectric ceramic material or piezoelectric single crystal material. The piezoelectric active part 31 may be a single-layer ceramic body or a multi-layer ceramic body, or a single-layer single crystal or a multi-layer single crystal, such as lead zirconate titanate (PZT) based piezoelectric ceramics, potassium sodium niobate (KNN) based piezoelectric ceramics, barium titanate (BT) based piezoelectric ceramics, lead magnesium niobate-lead indium niobate (PMN-PT) based piezoelectric single crystals, etc.

[0179] In some embodiments, the piezoelectric active part 31 is rectangular in shape along the optical axis. The friction head 32 protrudes from the piezoelectric active part 31 on the side facing the movable part 20 along the second direction. Specifically, two friction heads 32 are provided, spaced apart along the optical axis. It can be understood that the piezoelectric actuator 30 drives the movable part 20 to move along the optical axis. Compared to having only a single friction head 32 driving the movable part 20, having two friction heads 32 working together improves the effect of driving the movable part 20 to perform long-stroke movements.

[0180] In some embodiments, the friction head 32 is made of wear-resistant materials, such as various high-hardness wear-resistant ceramic materials, like alumina, zirconium oxide, silicon carbide ceramics, or high-wear-resistant metal materials, carbon fiber materials, or composite materials of ceramics, metal particles, and polymers. This improves the wear resistance of the friction head 32 and enhances the friction between the moving part 20 and the friction head 32, further strengthening the driving force provided by the piezoelectric actuator 30. Furthermore, the good wear resistance helps extend the service life of the friction head 32. In some embodiments, the friction head 32 and the piezoelectric active part 31 can be an integral structure or a detachable structure. The friction head 32 and the piezoelectric active part 31 can be fixed to the piezoelectric active part 31 by means of bonding, snap-fitting, nesting, welding, or fastener connection, ensuring that the connection strength is guaranteed through surface contact. Simultaneously, the friction head 32 can generate significant movement with the deformation of the piezoelectric active part 31.

[0181] In some embodiments, the piezoelectric active part 31 undergoes bending vibration along the second direction in a mode with one crest and one trough. Since the position of the friction head 32 can match the mode of the piezoelectric active part 31, the friction head 32 can be positioned at the crest and trough of the mode at the corresponding locations. It is understood that the shape of the friction head 32 can be a sphere, hemisphere, cuboid, frustum, cylinder, semi-cylinder, etc. The number of friction heads 32 can be one, two, or more. In this application, no specific limitations are placed on the shape or number of the friction heads 32, the shape and electrode arrangement of the piezoelectric active part 31, or the connection method between the friction head 32 and the piezoelectric active part 31.

[0182] In some embodiments, such as Figure 3 As shown, the pressure block 50 includes a lower pressure beam 51 and a lower pressure arm 52. The lower pressure arm 52 extends from both ends of the lower pressure beam 51 along a second direction toward the fixing part 10, so that the pressure block 50 is fixed in the first receiving groove 112 of the fixing part 10. There is a groove 500 between the lower pressure beam 51 and the lower pressure arm 52. The groove 500 is adapted to provide deformation space for the pre-pressed member 40. The pressure arm 52 includes a pressure mounting platform 522 and a pressure fixing platform 521. The pressure fixing platform 521 is located outside the pressure mounting platform 522 along the optical axis. The length of the pressure fixing platform 521 along the second direction is greater than the length of the pressure mounting platform 522 along the second direction, so that the groove 500 is formed between the pressure mounting platform 522 and the pressure beam 51. The pre-pressure component 40 is installed on the pressure mounting platform 522, and the pressure fixing platform 521 is fixed to the fixing part 10. This further simplifies the assembly process, enhances the stability of the camera module, and improves the installation stability of the pre-pressure component 40, thereby enhancing the stability of the provided pre-pressure.

[0183] In some embodiments, the first fixing sidewall 11 of the fixing part 10 further includes a base extension 114 and a second mounting plane 1141. The second receiving groove 113 is formed between the base extensions 114, and the second mounting plane 1141 is located on the top surface of the base extensions 114. The pressing fixing platform 521 of the pressure block 50 abuts against the second mounting plane 1141. It is understood that the pressing arm 52 can be connected to the fixing part 10, and the pressing fixing platform 521 of the pressing arm 52 and the second mounting plane 1141 of the fixing part 10 can abut against each other, further enhancing the stability and reliability of the pressure block 50. Since the pressing fixing platform 521 of the pressing arm 52 is located in different height planes, the groove 500 provides reserved space for the deformation generated by the pre-pressed member 40. Furthermore, by fixing the pressure block 50 to the fixing part 10, adjustments can be made during the assembly process, thereby reducing the risk of assembly inconsistencies.

[0184] In this design, the groove 500, the first receiving groove 112, and the second receiving groove 113 of the pressure block 50 are connected. At least a portion of the pre-pressing member 40 and the movable part 20 are clamped between the pressure block 50 and the fixed part 10, and the pre-pressing member 40 and at least a portion of the movable part 20 are located within the space connected by the groove 500, the first receiving groove 112, and the second receiving groove 113. It should be understood that when the pressure block 50 is pressed down further in the second direction, the pre-pressing member 40 and at least a portion of the movable part 20 will be clamped more tightly, the deformation of the pre-pressing member 40 will be greater, and thus the pre-pressure generated by the pre-pressing member 40 will be greater. In other words, the pressure block 50 can not only provide deformation space for the pre-pressing member 40 and maintain the deformation generated by the pre-pressing member 40, but also adjust the magnitude of the pre-pressure generated by the pre-pressing member 40. For example, by moving the downward pressing beam 51 downward toward the movable part 20 in the second direction to achieve further downward pressing of the pressure block 50, the pre-pressure of the pre-pressing member 40 can be increased.

[0185] In some embodiments, such as Figure 3 , Figure 6 and Figure 16 As shown, when the preload member 40 is subjected to the supporting force provided by the first support part 61, the preload member 40 undergoes an upward convex bending deformation and generates a preload force downward in the second direction, thereby providing a preload force downward in the second direction to the movable part 20. This causes the friction head 32 in the piezoelectric actuator 30 to rub against the movable part 20, further providing a stable driving force. It is understood that the flatness and consistency of the preload member 40 are relatively good, which helps to reduce the amount of variation in the preload member 40.

[0186] In some embodiments, the preload 40 is an elastic member capable of deformation, thereby providing a preload after deformation that drives the movable part 20 to maintain frictional contact with the piezoelectric actuator 30. Under the action of the preload, the friction head 32 in the piezoelectric actuator 30 contacts the friction part 22 of the movable part 20 and generates friction, thereby driving the movable part 20 to move. Specifically, as... Figure 5 As shown, the preload component 40 is a spring with a bent structure. When subjected to the pressure block 50 and the first support portion 61, the bent spring undergoes an upward convex bending deformation, generating a downward preload. It is understood that due to the inherent tolerances in the assembly process of the preload component 40, the bent spring is less affected by tolerance fluctuations within a certain preload range, resulting in higher consistency in the preload provided by the bent spring.

[0187] In some embodiments, such as Figure 3 and Figure 11 As shown, the pre-compression component 40 includes a fixed end 41, an elastic portion 42, and a bent portion 43. The bent portion 43 is disposed between the fixed end 41 and the elastic portion 42. The fixed end 41 is fixed to the pressure block 50, and the elastic portion 42 abuts against the piezoelectric active portion 31. It is understood that the elastic portion 42 and the bent portion 43 may also be provided with a hollow structure to further reduce the elastic coefficient, thereby helping to reduce the influence of material tolerances, assembly tolerances, or other displacement fluctuations on the magnitude of the pre-compression.

[0188] Furthermore, when the preload element 40 is set as a spring, such as Figure 5 As shown, the reed can be bent during manufacturing to introduce a certain deformation. Therefore, during assembly, after the reed is installed with the piezoelectric actuator 30 and the pressure block 50, the deformation of the reed itself applies pre-pressure to the piezoelectric actuator 30 and the moving part 20. In other words, by pre-deforming the reed before subsequent assembly and fixing, a greater pre-pressure is applied to the moving part 20, which helps improve the driving effect.

[0189] In some embodiments, the preload member 40 has a planar spring structure. It is understood that before the piezoelectric actuator 30 is driven, the deformation of the preload member 40 is generated by the synergistic action of the pressure block 50 and the first support portion 61. The preload member 40 includes a fixed end 41 and an elastic portion 42. The fixed end 41 is fixed to the pressure block 50, and the elastic portion 42 abuts against the piezoelectric active portion 31. When the preload member 40 is subjected to the action of the pressure block 50 and the first support portion 61, the elastic portion 42 of the preload member 40 will undergo an upward convex bending deformation, generating a downward preload. The presence of the preload helps maintain frictional contact between the friction head 32 and the movable portion 20 to generate a stable frictional force. The piezoelectric actuator 30 further drives the movable portion 20 to move, enhancing the driving effect.

[0190] In some embodiments, as Figure 6 and Figure 16 As shown, the deformation of the pre-compression member 40 is related to the length of the lower pressure arm 52 of the pressure block 50 along the second direction. In other words, given a fixed thickness of the first movable sidewall 21 of the movable part 20 and the piezoelectric actuator 30 along the second direction, when the length of the lower pressure arm 52 along the second direction is smaller, the pressure block 50 needs to move further downward along the second direction to connect the lower pressure arm 52 with the fixed part 10. At this time, the downward pressure beam 51 exerts a greater downward pressure on the first support part 61, resulting in a greater supporting force provided by the first support part 61 to the pre-compression member 40, thereby increasing the deformation of the pre-compression member 40 and generating a greater pre-compression force. Conversely, when the length of the lower pressure arm 52 along the second direction is larger, the degree to which the pressure block 50 moves downward along the second direction is smaller, resulting in a smaller deformation of the pre-compression member 40 and further reducing the generated pre-compression force. Understandably, the length of the lower pressure arm 52 along the second direction should not be too small to avoid excessive support force and preload, which could damage the piezoelectric actuator 30 and cause excessive pressure on the first support 61, resulting in over-compression and dents. In other words, the length of the lower pressure arm 52 along the second direction should also not be too large to prevent insufficient deformation of the preload member 40, thus providing less preload to the movable part 20 and failing to meet the need to drive the movable part 20 to move. On the other hand, increasing the length of the lower pressure arm 52 along the second direction would increase the height of the camera module along the second direction, reducing its portability.

[0191] In some embodiments, as Figure 3As shown, each of the pressing mounting platforms 522 of the pressure block 50 is provided with a first mounting surface 523 and a mounting post 524. The mounting post 524 protrudes from the first mounting surface 523 toward the fixed end 41 of the pre-compression member 40, so that the fixed end 41 of the pre-compression member 40 is fixed to the lower part of the first mounting surface 523 by the mounting post 524. Since the flush lower surface of the pressing mounting platform 522 helps to provide a flat mounting surface for the pre-compression member 40, it avoids the phenomenon of inconsistent height on the left and right sides of the pre-compression member 40, thereby avoiding the phenomenon of increasing the variation of the pre-compression member 40 and providing inconsistent pre-pressure to the moving part 20.

[0192] It is understood that the mounting posts 524 on both sides of the pressure mounting platform 522 correspond to the fixing holes 411 on the fixing end 41 of the pre-compression member 40. Therefore, during assembly, the mounting posts 524 can extend into the fixing holes 411, thereby fixing the pre-compression member 40 to the pressure mounting platform 522. Specifically, during fixing, the mounting posts 524 can be directly riveted to the fixing holes 411, or adhesive can be applied to the surface of the fixing end 41 of the pre-compression member 40 and the pressure mounting platform 522 for pre-fixation, and then the mounting posts 524 can be riveted to the fixing holes 411 for fixing. This further enhances the stability of the pre-compression member 40 and the pressure block 50 during installation and use, which is beneficial for maintaining the stability of the provided pre-pressure and downward pressure.

[0193] In some embodiments, the pre-compression component 40 can be first installed on the pressure block 50, and after the pressure block 50 is flipped over, the lower pressure arm 52 can be fixed to the first fixed sidewall 11 of the fixed part 10. This further optimizes the assembly process of the pre-compression component 40 and the pressure block 50, increases assembly efficiency, and reduces assembly difficulty. It should be understood that during the assembly process, the piezoelectric actuator 30 and the pre-compression component 40 are first assembled into a semi-finished product, and then the piezoelectric actuator 30 is carried by the pre-compression component 40 to the next assembly step. If the pre-compression component 40 is directly assembled to the fixed part 10, it is necessary to ensure that the position of the friction head 32 of the piezoelectric actuator 30 and the moving part 20 are aligned at all times during the assembly process. Otherwise, after the assembly is completed, the friction contact position between the friction head 32 and the moving part 20 may be offset, which will affect the driving effect. Moreover, due to the characteristics of the pre-compression component 40, it is also difficult to adjust the pre-compression component 40 during the assembly process. Compared to the above method, the assembly method of first installing the pre-pressing component 40 onto the pressure block 50, then flipping the pressure block 50 and fixing the lower pressure arm 52 onto the fixing part 10 eliminates the need to keep the friction head 32 and the movable part 20 aligned during the assembly of the pre-pressing component 40, thus reducing the assembly difficulty. Moreover, after the pre-pressing component 40 is attached to the pressure block 50, the position and assembly between the pressure block 50 and the fixing part 10 can be adjusted to achieve the adjustment of the pre-pressing component 40, thus providing greater adjustability.

[0194] In some embodiments, the driving device further includes a drive control component for sensing and controlling the movement position of the movable part 20. The drive control component is disposed on the side of the movable part 20 to make efficient use of the space of the camera module and increase the compactness of the structure. Further, the drive control component may include a Hall element, an integrated circuit driver (driver IC), a tunnel magnetoresistive (TMR), etc.

[0195] In some embodiments of this application, such as Figure 1 As shown, the camera module further includes an optical system, which is assembled inside the fixing part 10, which is a frame. The optical system includes a light-reflecting element 90, an optical lens 100, and a photosensitive component 80, arranged sequentially along the optical axis. The optical lens 100 is positioned on the light-reflecting path of the light-reflecting element 90, and the photosensitive component 80 receives the light transmitted from the optical lens 100 and forms an image. Specifically, the light-emitting direction of the light-reflecting element 90, the axial direction of the optical lens 100, and the normal direction of the photosensitive component 80 are all arranged along the optical axis. The light-reflecting element 90 is located inside the fixing part 10 near the light incident side, the optical lenses 100 are all located in the central region inside the fixing part 10, and the photosensitive component 80 is located inside the fixing part 10 away from the light incident side. The camera module provided in this application is easy to assemble and has good pre-stress consistency within the camera module.

[0196] In some embodiments of this application, the light-deflecting element 90 has an incident surface and an exit surface that intersect, and the light-deflecting element 90 changes the propagation direction of light to fold the optical path. The optical lens 100 extends along the optical axis and has a lens mounting hole, with at least one optical lens distributed along the optical axis within the lens mounting hole, thereby achieving the light-gathering effect of the optical lens 100. After receiving the converged light, the photosensitive component 80 converts the received light signal into an electrical signal for imaging processing.

[0197] 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 to achieve optical focusing and optical zoom functions. Of course, in this example, both optical lenses 100 can also be driven to move along the optical axis to achieve optical focusing and optical zoom 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 to move along the optical axis to achieve optical focusing and optical zoom 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 to move along the optical axis to achieve optical focusing and optical zoom functions. In other specific embodiments of this application, the number of optical lenses 100 can also be four, five, etc., and is not limited to this application.

[0198] In some embodiments, the photosensitive assembly 80 further includes a chip circuit board, a photosensitive chip, a filter element, and a filter element holder. The photosensitive chip is disposed and connected to the chip circuit board. The filter element holder is located around the photosensitive chip and is disposed on the chip circuit board. The filter element holder and the chip circuit board are either integrally formed or have a separate structure. The filter element is mounted on the filter element holder to maintain the light-sensing path of the photosensitive chip and to filter the imaging light entering the photosensitive chip.

[0199] This application can also provide a camera module, such as Figure 1 As shown, it includes:

[0200] The drive device as described above;

[0201] Optical deflector element 90 used to deflect incident light rays.

[0202] Optical lens 100 is held on the light-transformation path of the light-transformation element 90;

[0203] The photosensitive element 80 is used to receive light from the optical lens 100.

[0204] This application can also provide a method for assembling a camera module, such as... Figures 12 to 15 As shown, it includes the following steps:

[0205] S1. Provide a fixing part 10;

[0206] S2. A movable part 20 is provided and installed in the fixed part 10. The movable part 20 is used to support the optical lens 100, and the optical lens 100 defines an optical axis.

[0207] S3. Provide a piezoelectric actuator 30, a pre-compression component 40, and a pressure block 50, and assemble the piezoelectric actuator 30, the pre-compression component 40, and the pressure block 50 to form a pre-compression drive assembly, wherein the pre-compression component 40 is disposed between the piezoelectric actuator 30 and the pressure block 50, the piezoelectric actuator 30 is mounted on the pre-compression component 40, the pressure block 50 is coupled to the pre-compression component 40, and provides a deformable preset space for the pre-compression component 40;

[0208] S4. The pre-pressure drive assembly is installed on the fixed part 10 in a direction perpendicular to the optical axis and the drive assembly is located on top of the movable part 20. The pressure block 50 is fixed to the fixed part 10. The pre-pressure member 40 applies a pre-pressure perpendicular to the optical axis (i.e., the second direction) to the piezoelectric actuator 30. The piezoelectric actuator 30 and the movable part 20 abut against each other under the action of the pre-pressure, and the piezoelectric actuator 30 and the movable part 20 make frictional contact.

[0209] By installing a piezoelectric actuator 30 at the top of the movable part 20, the support structure can be located only at the bottom of the movable part 20 for support, eliminating the need for additional support structures at the top or sides of the movable part 20. This reduces the number of support structures and enhances assembly consistency and accuracy. Furthermore, since the assembly process proceeds layer by layer from bottom to top, the assembly process is further simplified, reducing assembly tolerances.

[0210] In some embodiments, a method for assembling a camera module, step S1 further includes the following steps:

[0211] S11. A fixing part 10 and a first magnetic member 71 are provided, the first magnetic member 71 being disposed on the fixing part 10.

[0212] In some embodiments, a method for assembling a camera module, step S2 further includes the following steps:

[0213] S21. A second magnetic member 72 is provided, and the second magnetic member 72 is provided in the movable part 20;

[0214] S22. A first support portion 61 and a second support portion 62 are provided. The first support portion 61 is assembled into the first guide groove 111, and the second support portion 62 is assembled into the first support groove 131. The second magnetic attractor 72 and the first magnetic attractor 71 are arranged opposite to each other along the second direction and interact to generate a magnetic attraction force. The magnetic attraction force causes the movable portion 20 and the fixed portion 10 to clamp the first support portion 61 and the second support portion 62.

[0215] In some embodiments, a method for assembling a camera module, step S3 further includes the following steps:

[0216] S31. First, fix the pre-compression component 40 and the piezoelectric actuator 30, and then couple the pre-compression component 40 to the pressure block 50 to form a pre-compression drive assembly. In this way, the pre-compression component 40 can be assembled with the piezoelectric actuator 30 together with the pressure block 50, reducing the assembly difficulty.

[0217] Specifically, in step S31, the pre-compression member 40 includes two fixed ends 41, an elastic part 42, and two bent parts 43. The two bent parts 43 are respectively disposed between the two fixed ends 41 and the elastic part 42 and respectively connect the elastic part 42 and the two fixed ends 41. The pre-compression member 40 is fixed to the pressure block 50 through the two fixed ends 41, and the piezoelectric actuator 30 is installed on the pre-compression member 40 by being fixed to the elastic part 42.

[0218] It is worth mentioning that, in other embodiments of this application, the pre-compression member 40 and the pressure block 50 may be fixed first in step S3. Specifically, step S3 includes:

[0219] S31b First, the pre-compression component 40 is coupled to the pressure block 50, and then the piezoelectric actuator 30 is installed on the pre-compression component 40 to form a pre-compression drive assembly.

[0220] Specifically, step S3 further includes the following steps:

[0221] Step S31: Assemble at least two support balls 601 and at least one small ball 602 disposed on the same side as the preload drive assembly into the first guide groove 111, and assemble at least one support ball 601 disposed on the opposite side of the preload drive assembly into the first support groove 131.

[0222] Furthermore, in some embodiments, step S4 further includes the step of:

[0223] S41. The lower pressure arm 52 of the pressure block 50 is installed on the fixed part 10. The friction head 32 of the piezoelectric actuator 30 is facing and abutting against the first movable side wall 21 of the movable part 20. The pressure block 50 keeps the first movable side wall 21 between the friction head 32 of the piezoelectric actuator 30 and the first support part 61. The first support part 61 provides the movable part 20 with a support force in the second direction.

[0224] S42, the pre-compression member 40 deforms under the action of the pressure block 50 and the first support part 61, providing a pre-compression force that is opposite to the support force and in the same direction as the downward force.

[0225] Specifically, in step S41, the pressure block 50 is installed in the first receiving groove 112 of the fixing part 10.

[0226] Furthermore, after assembling the piezoelectric actuator 30, the pre-pressing component 40, and the pressure block 50, the pressure block 50 is then assembled onto the fixed part 10 to complete the assembly process. This simplifies the entire assembly process and further reduces the problems of tilting of the moving part 20 and poor assembly consistency of the camera module caused by assembly errors.

[0227] Furthermore, in step S31, the pre-compression member 40 also includes a mounting part 44, which is fixed to the elastic part 42, thereby fixing the elastic part 42 to the piezoelectric actuator 30 through the mounting part 44.

[0228] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A driving device, characterized in that, include: A movable part for supporting an optical lens, the optical lens defining an optical axis, the top of the movable part having a friction plate extending along the optical axis direction, and the bottom of the movable part having a guide groove extending along the optical axis direction; A fixed part, wherein the movable part is movably disposed within the fixed part; A piezoelectric actuator includes at least one friction head that is in frictional contact with the friction plate and is used to drive the movable part to move along the optical axis. A preload element is disposed on the top of the piezoelectric actuator and applies a preload perpendicular to the optical axis to the moving part; A first support portion is disposed between the bottom of the movable portion and the fixed portion. The first support portion includes a plurality of support balls. When the movable portion moves to its limit position, the minimum spacing between the plurality of support balls arranged closely is not less than the maximum distance from the at least one friction head to one end of the friction plate.

2. The driving device as described in claim 1, characterized in that, The movable part includes a first movable sidewall and a second movable sidewall opposite to each other. The pre-pressing member, the friction head, and the friction plate are located sequentially at the top of the first movable sidewall along a second direction, and the first support part is located at the bottom of the first movable sidewall. The projections of the pre-pressing member along the second direction, the friction head along the second direction, the friction plate along the second direction, and the first support part along the second direction overlap each other, wherein the second direction is perpendicular to the optical axis direction.

3. The driving device as described in claim 2, characterized in that, The movable part includes an incident light side and an exit light side. When the movable part moves toward the incident light side to its limit position, the plurality of support balls are concentrated and arranged at one end of the guide groove near the exit light side. The minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the exit light side.

4. The driving device as described in claim 3, characterized in that, When the movable part moves toward the light-emitting side to its limit position, the plurality of support balls are concentrated and arranged at one end of the guide groove near the light-incident side, and the minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the light-incident side.

5. The driving device as described in claim 2, characterized in that, The movable part includes an incident light side and an exit light side. When the movable part moves toward the incident light side to its limit position, the plurality of support balls are concentrated and arranged at one end of the guide groove near the incident light side. The minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the incident light side.

6. The driving device as described in claim 5, characterized in that, When the movable part moves toward the light-emitting side to its limit position, the plurality of support balls are concentrated and arranged at one end of the guide groove near the light-emitting side, and the minimum spacing between the plurality of support balls is not less than the maximum distance from the at least one friction head to the end of the friction plate near the light-emitting side.

7. The driving device as described in claim 2, characterized in that, The projection of the friction plate along the second direction overlaps with the line connecting the farthest endpoints of the two guide grooves, and the projection of the friction plate along the second direction overlaps with the line connecting the two support balls of the first support portion.

8. The driving device as described in claim 2, characterized in that, The projection of the friction head along the second direction overlaps with the projection of the line connecting the first and last balls of the first support along the second direction.

9. The driving device as described in claim 2, characterized in that, The projection of the friction head along the second direction is covered by the projection of the guide groove along the second direction.

10. The driving device as claimed in claim 2, characterized in that, Also includes: A pressure block, which is fixed to a fixing part, is coupled to the pre-compression member and provides a deformable preset space for the pre-compression member; The pressure block is placed on top of the pre-pressing member, and the projection of the first support portion along the second direction is entirely within the projection range of the pressure block along the second direction.

11. The driving device as claimed in claim 3, characterized in that, The maximum distance from the at least one friction head to one end of the friction plate is not less than the mechanical stroke of the moving part.

12. A camera module, characterized in that, include: The drive device as described in any one of claims 1 to 11; Optical deflector element used to deflect incident light rays An optical lens, wherein the optical lens is held on the light-reversing path of the light-reversing element; A photosensitive component for receiving light from the optical lens.

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