Piezoelectric driving mechanism, camera module and electronic equipment

Abstract

The invention relates to a piezoelectric driving mechanism, a camera module and electronic equipment. The piezoelectric driving mechanism comprises a support; the rotor is movably arranged on the bracket; the piezoelectric actuator is arranged on the support, and part of the piezoelectric actuator can move relative to the support so as to drive the mover to move in at least one direction relative to the support. According to the piezoelectric driving mechanism, the matching precision requirement between the piezoelectric driving mechanism and the external element is reduced, so that the assembling difficulty of the piezoelectric driving mechanism is reduced, and the assembling cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to a piezoelectric drive mechanism, a camera module and an electronic device. Background Art

[0002] Compared with traditional electromagnetic motors, piezoelectric motors have greater energy density and higher displacement accuracy, and are not easily affected by magnetic interference. Piezoelectric motors are increasingly used in camera modules of electronic devices such as smartphones, tablets, and e-readers. For example, they are used to drive the movement of lenses or lens groups to achieve optical zoom or focus functions of camera modules. However, the current piezoelectric motors have high precision matching requirements with other components, making assembly difficult. Summary of the invention

[0003] The embodiments of the present application provide a piezoelectric drive mechanism, a camera module and an electronic device to solve the problem that the current piezoelectric motor has high precision matching requirements and difficult assembly between other components.

[0004] A piezoelectric drive mechanism, comprising:

[0005] Bracket;

[0006] a mover, movably disposed on the bracket; and

[0007] The piezoelectric driver is arranged on the support, and part of the piezoelectric driver can move relative to the support to drive the mover to move relative to the support in at least one direction.

[0008] A camera module comprises a lens group, an image sensor and the piezoelectric drive mechanism as described above, wherein the image sensor is arranged on the light-emitting side of the lens group, and the mover of the piezoelectric drive mechanism is connected to the lens group or the image sensor and is used to drive the lens group or the image sensor to move along the optical axis.

[0009] An electronic device comprises the camera module as described above.

[0010] The above-mentioned piezoelectric driving mechanism integrates the piezoelectric driver and the mover on the bracket, and the piezoelectric driver contacts the mover to drive the mover to move. Therefore, when the piezoelectric driving mechanism is used to drive external components such as a lens group or an image sensor to move, the piezoelectric driving mechanism is fixedly connected to the external component through the mover, and the piezoelectric driver does not need to contact the external component, which is beneficial to reduce the matching accuracy requirements between the piezoelectric driving mechanism and the external component, thereby helping to reduce the assembly difficulty of the piezoelectric driving mechanism and reduce the assembly cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 Schematic diagram of the structure of the piezoelectric drive mechanism in some embodiments.

[0013] Figure 2 for Figure 1 An exploded schematic diagram of the piezoelectric drive mechanism is shown.

[0014] Figure 3 for Figure 1 The structure diagram of the piezoelectric drive mechanism on one side of the cover body is shown.

[0015] Figure 4 for Figure 3 The cross-sectional schematic diagram of the piezoelectric drive mechanism along the XX direction is shown.

[0016] Figure 5 for Figure 3 The cross-sectional schematic diagram of the piezoelectric drive mechanism along the YY direction is shown.

[0017] Figure 6 for Figure 1 The structure diagram of the piezoelectric drive mechanism shown is with the cover omitted.

[0018] Figure 7 Schematic diagram of the structure of a piezoelectric driver in some embodiments.

[0019] Figure 8 Schematic diagram of vibration modes of a piezoelectric driver in some embodiments.

[0020] Fig. 9 Schematic diagram of the structure of piezoelectric drivers in other embodiments.

[0021] Fig.10 Schematic diagram of the structure of the camera module in some embodiments.

[0022] Fig.11 for Fig.10 The cross-sectional schematic diagram of the camera module shown is along the AA direction.

[0023] Fig.12 for Fig.10 The cross-sectional schematic diagram of the camera module shown is along the BB direction.

[0024] Fig.13 Schematic diagram of the structure of electronic equipment in some embodiments.

[0025] Fig.14 Schematic diagram of the structure of other components of the electronic device in some embodiments.

[0026] Reference numerals:

[0027] 10. electronic device; 11. middle frame; 12. back plate; 121. light hole; 20. camera module; 21. lens group; 22. lens barrel; 221. connection groove; 23. image sensor; 24. housing; 25. reflection prism; 30. piezoelectric drive mechanism; 31. mover; 311. sliding part; 312. matching part; 3121. rolling groove; 313. connection part; 32. bracket; 321. Bottom wall; 3211, sliding groove; 322, side wall; 3221, notch; 3222, groove body; 33, piezoelectric driver; 331, elastic base; 332, piezoelectric layer; 333, friction head; 34, elastic member; 35, fixing member; 351, bottom plate; 352, side plate; 353, convex part; 36, friction member; 37, rolling member; 38, cover body; 39, circuit structure; 391, contact. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0029] As used herein, "electronic device" refers to a device that can receive and / or send communication signals, including but not limited to a device that is connected via any one or more of the following connection methods:

[0030] (1) Connection via wired lines, such as Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, and direct cable connection;

[0031] (2) Via wireless interfaces, such as cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, and AM-FM broadcast transmitters.

[0032] An electronic device configured to communicate via a wireless interface may be referred to as a "mobile terminal". Examples of mobile terminals include, but are not limited to, the following electronic devices:

[0033] (1) Satellite phone or cellular phone;

[0034] (2) Personal Communications System (PCS) terminals that can combine cellular radio telephones with data processing, fax, and data communications capabilities;

[0035] (3) Radiotelephone, pager, Internet / Intranet access, Web browser, notepad, calendar, Personal Digital Assistant (PDA) equipped with a Global Positioning System (GPS) receiver;

[0036] (4) conventional laptop and / or handheld receivers;

[0037] (5) Conventional laptop and / or palmtop radiotelephone transceivers, etc.

[0038] In a conventional camera module that uses a piezoelectric motor to drive the movement of a lens or lens group to achieve a zoom or focus function, the elastic base of the piezoelectric motor is usually arranged on a carrier such as a housing of the camera module, and the friction head of the piezoelectric motor contacts the lens or lens group, and the movement generated by the friction head drives the lens or lens group to move along the optical axis. With such an arrangement, the accuracy of the movement of the lens or lens group requires a high degree of assembly accuracy of the elastic base of the piezoelectric motor in the camera module, as well as the assembly accuracy of the friction head and the lens or lens group, resulting in difficulties in assembling the camera module, high assembly costs, and the accuracy of zoom or focus is easily affected by insufficient assembly accuracy of the piezoelectric motor.

[0039] In order to solve the above problems, the present application provides a piezoelectric drive mechanism, a camera module and an electronic device.

[0040] See also Figure 1 and Figure 10-12 As shown, Figure 1 is a schematic diagram of the structure of the piezoelectric drive mechanism 30 in some embodiments, Fig.10 is a schematic diagram of the structure of the camera module 20 in some embodiments, Fig.11 and Fig.12 They are Fig.10The camera module 20 shown is a cross-sectional schematic diagram along the AA direction and the BB direction. The piezoelectric drive mechanism 30 provided in the present application includes but is not limited to being used in the camera module 20. The camera module 20 may also include a lens group 21 and an image sensor 23. The lens group 21 includes one or more coaxially arranged lenses with optical power. The lens group 21 may also include a lens barrel 22 for mounting the lens. The piezoelectric drive mechanism 30 has a mover 31 that can move in at least one direction. When the piezoelectric drive mechanism 30 is applied to the camera module 20, the mover 31 can be configured to be able to move in a direction parallel to the optical axis of the lens group 21. The piezoelectric drive mechanism 30 can be used to drive one of the lens group 21 and the image sensor 23 to move relative to the other in a direction parallel to the optical axis to achieve the zoom or focus function of the camera module 20. Taking the piezoelectric drive mechanism 30 used to drive the lens group 21 to move as an example, the mover 31 can be fixedly connected to the lens barrel 22 of the lens group 21. When the mover 31 moves along the optical axis direction parallel to the lens group 21, it can drive the lens group 21 to move relative to the image sensor 23 along the optical axis direction, thereby adjusting the distance between the lens group 21 and the image sensor 23 to achieve focusing or zooming functions.

[0041] Of course, the application of the piezoelectric drive mechanism 30 is not limited to the records in this application. The piezoelectric drive mechanism 30 can also be used in any applicable fields such as medical treatment, machinery, scientific research, etc., and can drive any applicable element to move in at least one direction, as long as the mover 31 is connected to the driven object and the mover 31 can meet the load and motion stroke requirements of the driven object.

[0042] Combination Figure 2 , Figure 3 , Figure 4 and Fig.12 As shown, in some embodiments, the piezoelectric drive mechanism 30 further includes a bracket 32 ​​and a piezoelectric driver 33, the mover 31 is movably disposed on the bracket 32, the piezoelectric driver 33 is disposed on the bracket 32, a portion of the piezoelectric driver 33 can move relative to the bracket 32, and a moving portion of the piezoelectric driver 33 is in contact with the mover 31, and when the moving portion of the piezoelectric driver 33 moves, the mover 31 can be driven to move in at least one direction relative to the bracket 32. For example, when the piezoelectric drive mechanism 30 is installed in the camera module 20, the movement of the piezoelectric driver 33 can drive the mover 31 to move in a direction parallel to the optical axis of the lens group 21 through contact friction.

[0043] It is understandable that the piezoelectric driver 33 and the mover 31 are integrated on the bracket 32, and the mover 31 is driven to move by the contact friction between the piezoelectric driver 33 and the mover 31, so that the mover 31 is connected to the driven object in the direction of the mechanical fixed connection, and the piezoelectric drive mechanism 30 can output the driving force that drives the driven object to move. Therefore, the piezoelectric driver 33 does not need to be arranged on an external carrier, for example, it does not need to be arranged on the housing 24 of the camera module 20, and the piezoelectric driver 33 does not need to contact the driven object such as the lens group 21, and the piezoelectric drive mechanism 30 only needs to establish a mechanical fixed connection with the driven object through the mover 31. During the preparation process of the piezoelectric drive mechanism 30, the output accuracy of the piezoelectric drive mechanism 30 can be guaranteed by controlling the relative assembly accuracy between the mover 31, the piezoelectric driver 33 and the bracket 32. The piezoelectric drive mechanism 30 can be mass-produced as a standard part, reducing the requirements of the piezoelectric driver 33 on the assembly environment, which is beneficial to improving the production efficiency of the piezoelectric drive mechanism 30. At the same time, it is beneficial to reduce the assembly accuracy requirements of the piezoelectric drive mechanism 30 in components such as the camera module 20, thereby reducing the assembly difficulty and assembly cost of the piezoelectric drive mechanism 30.

[0044] In some embodiments, the piezoelectric drive mechanism 30 also includes an elastic member 34, which is disposed on the bracket 32 ​​and is located on the side of the piezoelectric driver 33 that is away from the mover 31. The elastic member 34 elastically presses the piezoelectric driver 33 against the mover 31, so that the piezoelectric driver 33 is in elastic contact with the mover 31, thereby allowing the piezoelectric driver 33 to have an elastic activity space relative to the mover 31, which facilitates the movement of the moving part of the piezoelectric driver 33 and is also beneficial for the movement of the moving part of the piezoelectric driver 33 to drive the mover 31 to move through contact friction.

[0045] The elastic member 34 may not be in contact with the piezoelectric driver 33, but may directly abut against the side of the piezoelectric driver 33 facing away from the mover 31. The elastic member 34 may also be fixedly connected to the piezoelectric driver 33 to improve the assembly accuracy and structural reliability of the piezoelectric drive mechanism 30. Figure 4 As shown, in some embodiments, the piezoelectric driving mechanism 30 further includes a fixing member 35 , the fixing member 35 is fixedly connected to the elastic member 34 , and the piezoelectric driver 33 is disposed on the fixing member 35 .

[0046] In some embodiments, the fixing member 35 may include a bottom plate 351 and two side plates 352. The bottom plate 351 is located between the elastic member 34 and the piezoelectric driver 33, and is connected to the side of the piezoelectric driver 33 facing the elastic member 34. The two side plates 352 are respectively connected to the two opposite edges of the bottom plate 351 and are arranged opposite to each other. The two side plates 352 are respectively located on the opposite sides of the piezoelectric driver 33, and are respectively connected to the opposite sides of the piezoelectric driver 33. The connection method between the fixing member 35 and the piezoelectric driver 33 includes but is not limited to any applicable method such as bonding. The fixing member 35 also includes two protrusions 353 protruding from the side of the bottom plate 351 facing away from the piezoelectric driver 33. The two protrusions 353 are arranged at intervals and are both embedded in the elastic member 34, so that the fixing member 35 is fixedly connected to the elastic member 34. With such arrangement, the fixing member 35 has a stable and reliable connection with the piezoelectric driver 33 and the elastic member 34 , and can provide protection and limiting effects for the piezoelectric driver 33 , thereby improving the performance stability and structural reliability of the piezoelectric drive mechanism 30 .

[0047] In some embodiments, the piezoelectric drive mechanism 30 further includes a friction member 36, which is fixedly disposed on the mover 31 by any suitable fixing method such as bonding, and is located between the mover 31 and the piezoelectric driver 33, and the moving part of the piezoelectric driver 33 contacts the friction member 36. The material of the friction member 36 includes, but is not limited to, any suitable material with good wear resistance and high friction coefficient, such as ceramic material, polymer material, composite material, etc. Providing a friction member 36 with a higher friction coefficient on the mover 31 to contact the piezoelectric driver 33 is conducive to the movement of the piezoelectric driver 33 to better drive the mover 31 to move through contact friction, thereby enhancing the driving force of the piezoelectric drive mechanism 30.

[0048] refer to Figure 2 and Figure 4 As shown, in some embodiments, the piezoelectric drive mechanism 30 further includes a rolling member 37, and the mover 31 and the bracket 32 ​​are provided with relative rolling grooves 3121, and the rolling member 37 is arranged in the rolling grooves 3121 of the mover 31 and the bracket 32, and rollingly cooperates with the mover 31 and the bracket 32. The rolling member 37 includes but is not limited to any applicable element such as a ball, and the rolling member 37 is arranged between the mover 31 and the bracket 32 ​​to achieve sliding cooperation between the mover 31 and the bracket 32, which is conducive to reducing the sliding friction between the mover 31 and the bracket 32, making the movement of the mover 31 relative to the bracket 32 ​​smoother, and improving the driving force output by the piezoelectric drive mechanism 30 and the stability and accuracy of the stroke.

[0049] Combination Figure 1-Figure 3As shown, in some embodiments, the bracket 32 ​​is provided with a sliding groove 3211, and the mover 31 includes a sliding portion 311 and two matching portions 312. The sliding portion 311 is slidably disposed in the sliding groove 3211. The two matching portions 312 are connected to opposite sides of the sliding portion 311. The two matching portions 312 are both provided with a rolling groove 3121. The bracket 32 ​​is provided with a rolling groove 3121 at positions corresponding to the two matching portions 312. The two matching portions 312 are both slidably matched with the bracket 32 ​​through a rolling member 37. Figure 2 In the illustrated embodiment, eight rolling elements 37 are provided as an example, wherein four rolling elements 37 are rollably disposed in the rolling groove 3121 of one matching portion 312, and the other four rolling elements 37 are rollably disposed in the rolling groove 3121 of another matching portion 312. Two matching portions 312 are provided on both sides of the sliding portion 311 to slide with the bracket 32 ​​through the rolling elements 37, so that the stability and accuracy of the sliding of the mover 31 relative to the bracket 32 ​​can be improved, thereby improving the stability and accuracy of the driving force output by the piezoelectric drive mechanism 30.

[0050] It can be understood that while the elastic member 34 elastically presses the piezoelectric driver 33 against the mover 31, the elastic force of the elastic member 34 is also transmitted to the mover 31, thereby elastically pressing the mover 31, the rolling member 37 and the bracket 32, which is beneficial to improving the stability and reliability of the rolling cooperation between the opposite sides of the rolling member 37 and the mover 31 and the bracket 32.

[0051] In some embodiments, each rolling groove 3121 extends in one direction, and when the piezoelectric drive mechanism 30 is installed in the camera module 20, the extension direction of the rolling groove 3121 is parallel to the optical axis direction of the lens group 21, and the rolling member 37 can roll in the rolling groove 3121 along the extension direction of the rolling groove 3121. Therefore, in combination with the elastic pressing effect of the elastic member 34 on the mover 31, the rolling member 37 and the bracket 32, the rolling groove 3121 can also provide a limiting effect on the sliding of the mover 31 relative to the bracket 32, constraining the sliding direction of the mover 31 relative to the bracket 32, so that when the piezoelectric drive mechanism 30 is installed in the camera module 20, the mover 31 can slide more stably and accurately in the direction parallel to the optical axis of the lens group 21, thereby improving the accuracy of focus or zoom drive.

[0052] In some embodiments, the sliding groove 3211 provided on the bracket 32 ​​may also extend in one direction, and the extending direction of the sliding groove 3211 is parallel to the extending direction of the rolling groove 3121, and the sliding part 311 can slide in the sliding groove 3211 along the extending direction of the sliding groove 3211. Thus, when the elastic member 34 elastically presses the mover 31 against the bracket 32, the sliding groove 3211 can also provide a limiting effect on the sliding of the mover 31 relative to the bracket 32, thereby improving the accuracy and stability of the movement of the mover 31. Of course, the number and extending direction of the rolling grooves 3121, as well as the number of rolling elements 37 in each rolling groove 3121 are not limited, and can be specifically set according to the sliding requirements between the mover 31 and the bracket 32. For example, when the piezoelectric drive mechanism 30 needs to drive the driven object to move in two directions perpendicular to each other, at least two rolling grooves 3121 may be provided, and the extending directions of at least two rolling grooves 3121 are perpendicular to each other, so as to provide a limit for the movement of the mover 31 in the two directions perpendicular to each other.

[0053] Combination Figure 1 and Fig.12 As shown, in some embodiments, the mover 31 further includes a connecting portion 313 disposed on the side of the sliding portion 311 facing away from the piezoelectric driver 33, and the connecting portion 313 is exposed to the bracket 32 ​​through the sliding groove 3211, for example, protruding from the outside of the bracket 32. The mover 31 is provided with a connecting portion 313 exposed to the bracket 32, and when the piezoelectric driving mechanism 30 is installed in the camera module 20, the mover 31 can be fixedly connected to a driving object such as the lens group 21 through the connecting portion 313, so as to drive the lens group 21 to move. For example, a connecting groove 221 can be provided on the outer peripheral side of the lens barrel 22 of the lens group 21, and at least a portion of the connecting portion 313 is embedded in the connecting groove 221 to be fixedly connected to the lens group 21. As a result, the connection between the mover 31 and the driven object can be made more convenient, and the piezoelectric drive mechanism 30 can be more easily mass-produced as a standard part. At the same time, the connection between the mover 31 and the driven object is not easy to affect the assembly of the internal components of the piezoelectric drive mechanism 30, and is not easy to interfere with the components in the piezoelectric drive mechanism 30, which is beneficial to improving the structural reliability and performance stability of the piezoelectric drive mechanism 30.

[0054] refer to Figure 2 , Figure 4 and Figure 5As shown, in some embodiments, the bracket 32 ​​includes a bottom wall 321 and a side wall 322 arranged around the bottom wall 321, and the mover 31 is slidably arranged on the bottom wall 321. The sliding groove 3211 can be arranged on the bottom wall 321, and the two matching parts 312 of the mover 31 are slidably matched with the bottom wall 321 through the rolling member 37. The sliding part 311 is slidably arranged in the sliding groove 3211, and the connecting part 313 protrudes from the side of the bottom wall 321 facing away from the sliding part 311. The piezoelectric driver 33 is located on the side of the mover 31 facing away from the bottom wall 321, and the elastic member 34 is located on the side of the piezoelectric driver 33 facing away from the mover 31. The piezoelectric driver 33 is arranged in the middle of the elastic member 34, and the opposite ends of the elastic member 34 are respectively connected to the two opposite side walls 322 in a one-to-one correspondence. The side wall 322 is arranged around the elastic member 34, the piezoelectric driver 33 and the mover 31. The piezoelectric drive mechanism 30 further includes a cover 38, which is arranged on one end of the side wall 322 away from the bottom wall 321 and shields the elastic member 34 and the piezoelectric driver 33. In other words, except for the connecting portion 313 and the sliding portion 311 of the mover 31 which are exposed to the bracket 32 ​​through the sliding groove 3211, the rest of the mover 31, as well as the piezoelectric driver 33, the elastic member 34, the rolling member 37 and other components are all accommodated in the accommodation space formed by the bracket 32 ​​and the cover 38.

[0055] Such an arrangement, in conjunction with the elastic member 34 that elastically presses the piezoelectric driver 33, the mover 31 and the rolling member 37 against the bottom wall 321, can optimize the spatial layout of the piezoelectric drive mechanism 30, so that the various components of the piezoelectric drive mechanism 30 form a tightly structured whole, thereby improving the structural compactness and performance reliability of the piezoelectric drive mechanism 30, and helping to compress the space occupied by the piezoelectric drive mechanism 30, so that when the piezoelectric drive mechanism 30 is applied to the camera module 20, it is helpful to compress the volume of the camera module 20.

[0056] See also Figure 2 and Figure 6 As shown, in some embodiments, the piezoelectric drive mechanism 30 further includes a circuit structure 39, the piezoelectric driver 33 is electrically connected to the circuit structure 39, a notch 3221 is provided on the side wall 322 of the bracket 32, and a groove 3222 connected to the notch 3221 is also provided on the outer side of the side wall 322 of the bracket 32, and a portion of the circuit structure 39 passes through the notch 3221 and forms a contact 391 in the groove 3222. The circuit structure 39 includes but is not limited to any applicable circuit connection element such as a flexible printed circuit board (FPC), and the contact 391 formed by the circuit structure 39 is used to electrically connect with an external element, so as to realize power supply and control of the piezoelectric driver 33. For example, when the piezoelectric drive mechanism 30 is installed in the camera module 20, the contact 391 of the circuit structure 39 in the piezoelectric drive mechanism 30 is electrically connected to the flexible printed circuit board of the camera module 20 through a wire.

[0057] In some embodiments, the materials of the bracket 32 ​​, the cover 38 , the mover 31 and the fixing member 35 include but are not limited to any suitable material such as plastic or metal, and the elastic member 34 includes but is not limited to a spring.

[0058] The specific configuration of the piezoelectric driver 33 is not limited, as long as a portion of the piezoelectric driver 33 can move relative to the bracket 32 ​​to drive the mover 31 to move relative to the bracket 32 ​​in at least one direction. Figure 4 and Figure 7 As shown, in some embodiments, the piezoelectric driver 33 includes an elastic base 331, a piezoelectric layer 332 and a friction head 333. The piezoelectric layer 332 is disposed on at least two orthogonal sides of the elastic base 331 (such as Figure 7 In the figure, the piezoelectric layer 332 is arranged on two orthogonal side surfaces as an example for illustration, and a plurality of first electrodes (not shown) are arranged on the surface of the side of the piezoelectric layer 332 on each side away from the elastic base 331; the friction head 333 is arranged on a side surface of the elastic base 331, or on the first electrode of the piezoelectric layer 332. Among them, each first electrode excites the piezoelectric driver 33 to produce different vibration modes with orthogonal directions under the action of different driving voltages, so that the friction head 333 supports the generation of displacement components along two orthogonal directions on different preset planes, so as to drive the contacting mover 31 to move along at least one direction of the target plane, and the target plane is perpendicular to the different preset planes. In this embodiment, the friction head 333 can be understood as the moving part of the aforementioned piezoelectric driver 33.

[0059] The structure of the piezoelectric driver 33 of this embodiment is simple, and a single piezoelectric driver 33 can drive the mover 31 to realize movement in one direction or in two mutually perpendicular directions, which is conducive to simplifying the structural design of the piezoelectric driver 33 and reducing the thickness of the piezoelectric driver 33, thereby helping to reduce the volume of the piezoelectric drive mechanism 30. In addition, through vibration drive, nanometer-level displacement accuracy can be achieved to realize high-precision displacement control.

[0060] It can be understood that the several first electrodes in this embodiment include one or more. Optionally, the surface of one side of the piezoelectric layer 332 away from the elastic base 331 can be divided into several first electrode partitions according to needs, and each first electrode partition is provided with a first electrode. Each first electrode can be used to achieve polarization and can be used as a working electrode when a voltage is applied. When the driving voltage is applied to the piezoelectric layer 332 via the first electrode, the piezoelectric material will deform, for example, stretch and bend, thereby driving the friction head 333 to form a displacement component. Optionally, the first electrode on the surface of each piezoelectric layer 332 can be prepared by magnetron sputtering or screen printing. Optionally, several first electrodes on the piezoelectric layer 332 are completely covered on the surface of the piezoelectric layer 332, so that the piezoelectric layer 332 can be completely polarized, and the polarization method has a high overall utilization rate for the piezoelectric material, which is conducive to enhancing the deformation effect of the piezoelectric material, further enhancing the thrust of the friction head 333, thereby enhancing the driving force of the piezoelectric drive mechanism 30.

[0061] Optionally, the piezoelectric layer 332 can be prepared by piezoelectric ceramics, piezoelectric single crystals or textured ceramics. In order to reduce the driving voltage, multilayer co-fired ceramics can also be prepared by tape casting technology. Further optionally, piezoelectric ceramics and textured ceramics can be made of lead zirconate titanate (PZT)-based, lead magnesium niobate-lead titanate (PMN-PT)-based, lead indium niobate-lead magnesium niobate-lead titanate (PIN-PMN-PT)-based and other lead-containing components, and can also be made of barium titanate (BT)-based, sodium bismuth titanate (BNT)-based, potassium sodium niobate (KNN)-based, barium calcium zirconate titanate (BCZT)-based and other lead-free components. Further optionally, the piezoelectric single crystal may be made of lead-containing components such as lead zinc niobate-lead titanate (PZN-PT) based, lead magnesium niobate-lead titanate (PMN-PT) based, lead indium niobate-lead zinc niobate-lead titanate (PIN-PZN-PT) based, lead indium niobate-lead magnesium niobate-lead titanate (PIN-PMN-PT) based, and may also be made of lead-free components such as sodium bismuth titanate (BNT) based, sodium bismuth titanate-potassium bismuth titanate (BNT-BKT) based, and sodium potassium titanate (KNN) based.

[0062] The elastic base 331 can be used to support each piezoelectric layer 332. When the piezoelectric layer 332 generates a vibration mode, the elastic base 331 can be elastically deformed due to its elasticity. When a voltage is applied to each first electrode, the elastic base 331 can lead out a second electrode (not shown in the figure), and the second electrode is electrically connected to a side surface of each piezoelectric layer 332 close to the elastic base 331 for grounding.

[0063] Optionally, the elastic base 331 can be made of non-conductive materials such as plastic and glass, or can be made of conductive materials such as metal and metal oxide. When the elastic base 331 is made of conductive materials, the elastic base 331 can be directly used as the second electrode and connected to the ground; when the elastic base 331 is made of non-conductive materials, the second electrode can be set on the end surface of the elastic base 331, or the center of the elastic base 331 can adopt a partial hollow structure to set the second electrode in the hollow structure. The hollow shape can be cylindrical, rectangular, cube, etc., so as to facilitate modal excitation or second electrode extraction.

[0064] Optionally, the projection of the elastic base 331 on the preset plane completely covers the projection of the piezoelectric layer 332 on the preset plane, that is, the length dimension and the width dimension of the side of the elastic base 331 are respectively greater than or equal to the length dimension and the width dimension on the side of the piezoelectric layer 332. Optionally, the elastic base 331 can be designed in a square structure, such as a rectangular parallelepiped structure.

[0065] The friction head 333 is arranged on one side of the elastic base 331. Optionally, it can be arranged on the first electrode of the piezoelectric layer 332 on one side of the elastic base 331, or it can be directly arranged on one side of the elastic base 331 (that is, it is arranged at a position on the elastic base 331 where the piezoelectric layer 332 is not arranged). The friction head 333 can be used to generate displacement components along two orthogonal directions of a preset plane, that is, micro-vibration, when the piezoelectric driver 33 simultaneously generates vibration modes with mutually orthogonal displacement directions, thereby generating an elliptical trajectory moving along the preset plane. When different driving voltages and driving modes are adjusted, the friction head 333 can generate displacement components along two orthogonal directions on different preset planes, and generate macroscopic linear motion or rotational motion on the preset plane through the action of friction force, so as to drive the contacting sliding parts 311 to move along at least one direction of the target plane, and the target plane is perpendicular to different preset planes.

[0066] Optionally, the shape of the friction head 333 can be designed in regular shapes such as square, cylindrical, semi-cylindrical, spherical, triangular cone, etc., or can be designed in some other irregular shapes. The material of the friction head 333 can be selected from alumina (Al2O3), silicon oxide (SiO2), zirconium oxide (ZrO2) or carbon fiber, polyester fiber, aluminum, iron, copper, stainless steel and other wear-resistant materials to prevent wear under long-term work and maintain matching accuracy.

[0067] refer to Figure 7 and Figure 8As shown, in some embodiments, under the action of different driving voltages, the piezoelectric driver 33 supports a first-order stretching vibration mode, a first-order bending vibration mode, and a second-order bending vibration mode; wherein the first-order stretching vibration mode is coupled with the first-order bending vibration mode, so that the friction head 333 generates an elliptical trajectory moving along a first preset plane; the first-order bending vibration mode is coupled with the second-order bending vibration mode, so that the friction head 333 generates an elliptical trajectory moving along a second preset plane; the first preset plane is perpendicular to the second preset plane.

[0068] By adjusting different driving voltages and driving modes, the piezoelectric driver 33 can support the first-order stretching vibration mode, the first-order bending vibration mode, and the second-order bending vibration mode. Figure 8 As shown, the first-order stretching vibration mode can be understood as the stretching vibration mode along the X-axis direction (such as Figure 8 The first and second order bending vibration modes can be understood as bending vibration modes along the Z axis (B2, Z vibration modes), and the second and second order bending vibration modes can be understood as bending vibration modes along the Y axis (B2, Y vibration modes). Figure 8 As shown, the L1,X vibration mode is coupled with the B2,Z vibration mode, so that the friction head 333 generates an elliptical trajectory moving along the first plane (such as the XOZ plane in the figure), so that the mover 31 can be deduced to move along the X-axis direction; the B2,Y vibration mode is coupled with the B2,Z vibration mode, so that the friction head 333 generates an elliptical trajectory moving along the second plane (such as the YOZ plane in the figure).

[0069] It can be understood that when the piezoelectric drive mechanism 30 is installed in the camera module 20, if the piezoelectric drive mechanism 30 only needs to drive the lens group 21 to move along the optical axis direction, the L1, X vibration mode can be coupled with the B2, Z vibration mode to drive the mover 31 to move along the X-axis direction, and the X-axis direction is set to be parallel to the optical axis direction of the lens group 21, or the B2, Y vibration mode can be coupled with the B2, Z vibration mode to drive the mover 31 to move along the Y-axis direction, and the Y-axis direction is set to be parallel to the optical axis direction of the lens group 21.

[0070] refer to Fig. 9As shown, in other embodiments, the piezoelectric driver 33 may be provided with two friction heads 333, and the two friction heads 333 may alternately contact the mover 31 in one vibration cycle, thereby alternately driving the mover 31 to move in the target direction through friction. For example, when the L1,X vibration mode is coupled with the B2,Z vibration mode, the friction head 333 generates an elliptical trajectory moving along the XOZ plane, and the two friction heads 333 alternately contact the mover 31 in one vibration cycle, and drive the mover 31 to move in the X-axis direction through friction; when the B2,Y vibration mode is coupled with the B2,Z vibration mode, the friction head 333 generates an elliptical trajectory moving along the YOZ plane, and the two friction heads 333 alternately contact the mover 31 in one vibration cycle, and drive the mover 31 to move in the Y-axis direction through friction.

[0071] It can be understood that in terms of modal excitation, the coupling between the first-order stretching vibration mode and the second-order bending vibration mode is adopted in this embodiment. In actual operation, it is not necessary to strictly select these two modes. As long as the elliptical motion of the friction head 333 can be excited, any combination of two or more modes is acceptable.

[0072] In some embodiments, the polarization direction of each piezoelectric layer 332 corresponds to a thickness direction of each piezoelectric layer 332 , and the polarization directions of two piezoelectric layers 332 on two orthogonal sides are orthogonal.

[0073] Among them, each piezoelectric layer 332 of this embodiment adopts a polarization method in the thickness direction, and the piezoelectric material of each piezoelectric layer 332 is polarized in a thickness direction parallel to each layer, so that the polarization directions of the two piezoelectric layers 332 on the two orthogonal sides are orthogonal, so that when the driving voltage is applied to the different piezoelectric layers 332 through the first electrode, they can be excited to produce different vibration modes with orthogonal directions. Optionally, the polarization directions of the two piezoelectric layers 332 on the two parallel sides can be the same or opposite, and this embodiment does not specifically limit this.

[0074] It should be noted that the polarization direction of each piezoelectric layer 332 is not limited to the thickness direction. In other embodiments, the polarization direction of each piezoelectric layer 332 may also be parallel to the width direction of each piezoelectric layer 332. It can be understood that based on the different polarization directions, the directions of the first vibration mode and the second vibration mode generated by the piezoelectric driver 33 are also different.

[0075] In other embodiments, the elastic base 331 has four side surfaces, any two adjacent side surfaces are orthogonal, a piezoelectric layer 332 is provided on each side surface, and a plurality of spaced first electrodes are provided on each piezoelectric layer 332. The piezoelectric layer 332 on each side surface can generate a vibration mode through a driving voltage applied to the first electrode. On the one hand, more first electrodes can be used to excite more identical or different vibration modes to achieve the output of macroscopic motion; on the other hand, the overall vibration mode of the piezoelectric driver 33 can be made more uniform, and the overall driving ability of the piezoelectric driver 33 can be enhanced, so that the piezoelectric driver 33 can achieve high thrust driving on the basis of miniaturization and high precision.

[0076] Optionally, the shapes and sizes of the piezoelectric layers 332 on the parallel sides may correspond to each other, so as to achieve a symmetrical arrangement between the parallel piezoelectric layers 332; the shapes and sizes of the first electrodes of the piezoelectric layers 332 on the parallel sides may correspond to each other, so as to achieve a symmetrical arrangement of the first electrodes between the parallel piezoelectric layers 332. It can be understood that the shapes and sizes of the piezoelectric layers 332 on the orthogonal sides may correspond to each other, and the shapes and sizes of the first electrodes of the piezoelectric layers 332 on the orthogonal sides may correspond to each other, and this embodiment does not further limit this. It can be understood that the number of first electrodes on the piezoelectric layer 332 on each side is not limited. In order to further improve the uniformity of the vibration mode, an even number of first electrodes on the piezoelectric layer 332 on each side may be set.

[0077] In some embodiments, when the piezoelectric driver 33 is provided with two friction heads 333, the two friction heads 333 are arranged at intervals along the extension direction of the elastic base 331. Thus, the friction heads 333 are provided on one side of the length of the piezoelectric driver 33, so that the thickness of the piezoelectric driver 33 is greatly reduced, miniaturization integration can be achieved, and device space can be saved.

[0078] In some embodiments, a plurality of stacked piezoelectric layers 332 are provided on each of at least two side surfaces, and a plurality of first electrodes are provided on the surface of each piezoelectric layer 332 away from the elastic base 331. Thus, the piezoelectric layers 332 with more layers can be driven via their respective first electrodes. By regulating the driving voltages of more piezoelectric layers 332, higher precision regulation can be further achieved, more vibration modes can be matched, and greater thrust can be achieved. Optionally, the internal electrodes of each piezoelectric layer 332 can be divided into multiple areas by a forked electrode design, and a plurality of first electrodes can be provided on the surface of one side away from the elastic base 331 corresponding to the divided areas of the piezoelectric layer 332. It can be understood that the piezoelectric layers 332 with multiple layers stacked are still relatively smaller than the stacking design of the dual piezoelectric driver 33 with a double-layer guide rail, so that the characteristics of miniaturization can still be achieved; it can be understood that the number of stacked layers can be adjusted according to the actual driving requirements and the overall size requirements, and this embodiment is not further limited to this. It can be understood that when there are multiple first electrodes on the same piezoelectric layer 332, the multiple first electrodes are spaced apart. At this time, when forming the first electrode, the piezoelectric layer 332 can directly form multiple first electrodes by electroplating, or after forming one electrode, multiple first electrodes can be formed by cutting; the interval positions between the corresponding first electrodes of the piezoelectric layer 332 can be flush with other positions, or grooves can be formed.

[0079] In one embodiment, multiple first electrodes are divided into at least two groups, each group includes at least two first electrodes, each first electrode in the same group is connected to the same AC voltage, and the AC voltages connected to the first electrodes in different groups are 90° or 270° apart in phase; wherein the second electrode for grounding of the piezoelectric layer 332 is led out through the elastic base 331.

[0080] Among them, the multiple first electrodes are divided into at least two groups, which means that all the first electrodes of the entire piezoelectric driver 33 can be divided into at least two driving groups to apply different driving voltages. Each group includes at least two first electrodes, and the at least two first electrodes can come from the piezoelectric layer 332 on the same side, or from different piezoelectric layers 332. The first electrode, the second electrode, etc. can be metal sheets, or conductive layers such as conductive silver paste. The side of the piezoelectric layer 332 close to the elastic base 331 is connected to the ground voltage, and the polarization direction of each piezoelectric layer 332 points from the side of the piezoelectric layer 332 close to the elastic base 331 to the other side away from the elastic base 331, and a voltage difference is formed on different sides of each piezoelectric layer 332.

[0081] Each piezoelectric layer 332 is excited to generate a vibration mode by the AC voltage with a phase difference of 90°, 180° or 270° connected via different groups of first electrodes. The piezoelectric material of the piezoelectric layer 332 produces a displacement along the polarization direction due to the inverse piezoelectric effect of the piezoelectric mode, so that the vibration modes of the piezoelectric layer 332 in orthogonal directions are simultaneously excited under the action of the electric field. Due to the phase difference of the applied voltage, the displacement components perpendicular to each other along the preset plane generated on the friction head 333 will couple to form a microscopic elliptical motion.

[0082] Please see again Fig.10 , Fig.11 and Fig.12 As shown, in some embodiments of the present application, a camera module 20 is provided, comprising a lens group 21, an image sensor 23, and a piezoelectric drive mechanism 30 as described in any of the above embodiments, wherein the image sensor 23 is arranged on the light-emitting side of the lens group 21, and the connecting portion 313 of the mover 31 of the piezoelectric drive mechanism 30 is connected to the lens group 21 or the image sensor 23, and is used to drive the lens group 21 or the image sensor 23 to move along the optical axis, so as to adjust the relative position between the lens group 21 and the image sensor 23, and realize the focus or zoom function of the camera module 20. The above-mentioned piezoelectric drive mechanism 30 is adopted in the camera module 20, and the piezoelectric driver 33 in the piezoelectric drive mechanism 30 does not need to contact with the components in the camera module 20, and can output the driving force by connecting the mover 31 with the lens group 21, which is conducive to reducing the assembly difficulty of the piezoelectric drive mechanism 30 in the camera module 20 and reducing the assembly cost.

[0083] All lenses in the camera module 20 are mounted on the same lens barrel 22 to form a lens group 21, and the piezoelectric drive mechanism 30 can be used to drive all lenses in the camera module 20 to move synchronously. Fig.11 As shown, in some embodiments, the camera module 20 may also include a plurality of lens groups 21 spaced in sequence along the optical axis, and the piezoelectric drive mechanism 30 is only used to drive one of the lens groups 21 to move along the optical axis relative to the other lens groups 21 and the image sensor 23, and can also achieve the focus or zoom function, which can be specifically designed according to the optical path design of the camera module 20 and the focus or zoom requirements. Fig.11 and Fig.12 Taking the camera module 20 including two lens groups 21 as an example, the mover 31 of the piezoelectric drive mechanism 30 is connected to the lens barrel 22 of a lens group 21 closer to the image sensor 23 in the optical axis direction, and the camera module 20 adopts an internal focusing method.

[0084] In some embodiments, the camera module 20 further includes a housing 24 and a reflective prism 25. The lens group 21, the image sensor 23, the piezoelectric drive mechanism 30, the reflective prism 25 and other components are all accommodated in the housing 24. The side of the cover 38 of the piezoelectric drive mechanism 30 facing away from the bottom wall 321 can be fixed to the inner side of the housing 24 by any suitable fixing method such as bonding, so that the side of the bottom wall 321 facing away from the cover 38 faces the lens group 21, so as to facilitate the connection between the mover 31 and the lens group 21. The reflective prism 25 can be arranged on the light incident side of the lens group 21, and is used to deflect the light path by reflection. For example, the reflective prism 25 can deflect the light path by 90° and then transmit it to the lens group 21, and the camera module 20 can be designed for periscope telephoto. Of course, the camera module 20 can also have any other type of design, and the components and optical paths in the camera module 20 can have any other applicable settings, which are not limited in the present application, as long as the piezoelectric drive mechanism 30 can drive the lens group 21 or the image sensor 23 to move.

[0085] refer to Fig.13 As shown, the present application also provides an electronic device 10, including the camera module 20 described in any of the above embodiments, the electronic device 10 is but not limited to a smart phone, a tablet computer, an e-reader, etc. Fig.13 Taking a smart phone as an example, the camera module 20 can be the front camera or the rear camera of the electronic device 10. Taking the camera module 20 realizing rear-mounted camera as an example, the electronic device 10 also includes a middle frame 11, a display panel and a back plate 12, the display panel and the back plate 12 are arranged on the opposite sides of the middle frame 11, and the camera module 20 is accommodated in the accommodation space formed by the middle frame 11, the display panel and the back plate 12, and collects light through the light hole 121 opened in the back plate 12. The above-mentioned camera module 20 is adopted in the electronic device 10, and the assembly of the camera module 20 is simple and the assembly cost is low. At the same time, since the piezoelectric drive mechanism 30 has a compact structure and occupies a small space, it is conducive to compressing the space occupied by the camera module 20, thereby facilitating the miniaturization design of the electronic device 10.

[0086] refer to Fig.14 , Fig.14 The electronic device 10 is a schematic diagram of the structure of the electronic device 10 provided in the embodiment of the present application. The electronic device 10 may include a radio frequency (RF) circuit 501, a memory 502 including one or more computer-readable storage media, an input unit 503, a display unit 504, a sensor 505, an audio circuit 506, a wireless fidelity (WiFi) module 507, a processor 508 including one or more processing cores, and a power supply 509. Those skilled in the art will understand that Fig.14The structure of the electronic device 10 shown in the figure does not constitute a limitation on the electronic device 10, and the electronic device 10 may include more or less components than those shown in the figure, or combine certain components, or arrange the components differently.

[0087] The radio frequency circuit 501 can be used to send and receive information, or receive and send signals during a call. In particular, after receiving the downlink information of the base station, it is handed over to one or more processors 508 for processing; in addition, the data related to the uplink is sent to the base station. Generally, the radio frequency circuit 501 includes but is not limited to an antenna, at least one amplifier, a tuner, one or more oscillators, a subscriber identity module (SIM) card, a transceiver, a coupler, a low noise amplifier (LNA), a duplexer, etc. In addition, the radio frequency circuit 501 can also communicate with the network and other devices through wireless communication. The wireless communication can use any communication standard or protocol, including but not limited to the Global System of Mobile Communication (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Long Term Evolution (LTE), email, Short Messaging Service (SMS), etc.

[0088] The memory 502 can be used to store applications and data. The applications stored in the memory 502 contain executable codes. The applications can form various functional modules. The processor 508 executes various functional applications and data processing by running the applications stored in the memory 502. The memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the electronic device 10 (such as audio data, a phone book, etc.), etc. In addition, the memory 502 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 502 can also include a memory controller to provide the processor 508 and the input unit 503 with access to the memory 502.

[0089] The input unit 503 can be used to receive input digital, character information or user feature information (such as fingerprints), and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control. Specifically, in a specific embodiment, the input unit 503 may include a touch-sensitive surface and other input devices. The touch-sensitive surface, also known as a touch display screen or a touch pad, can collect user touch operations on or near it (such as operations performed by users using fingers, styluses, or any other suitable objects or accessories on or near the touch-sensitive surface), and drive corresponding connection devices according to a pre-set program. Optionally, the touch-sensitive surface may include a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into touch point coordinates, and then sends it to the processor 508, and can receive and execute commands sent by the processor 508.

[0090] The display unit 504 can be used to display information input by the user or information provided to the user and various graphical user interfaces of the electronic device 10, which can be composed of graphics, text, icons, videos and any combination thereof. The display unit 504 may include a display panel. Optionally, the display panel can be configured in the form of a liquid crystal display (LCD, Liquid Crystal Display), an organic light-emitting diode (OLED, Organic Light-Emitting Diode), etc. Further, the touch-sensitive surface may cover the display panel, and when the touch-sensitive surface detects a touch operation on or near it, it is transmitted to the processor 508 to determine the type of touch event, and then the processor 508 provides a corresponding visual output on the display panel according to the type of touch event. Although in Fig.14 In the embodiment, the touch-sensitive surface and the display panel are used as two independent components to realize input and output functions, but in some embodiments, the touch-sensitive surface and the display panel can be integrated to realize input and output functions.

[0091] The electronic device 10 may also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel according to the brightness of the ambient light, and the proximity sensor may turn off the display panel and / or backlight when the electronic device 10 is moved to the ear. As a type of motion sensor, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that can also be configured in the electronic device 10, they will not be repeated here.

[0092] The audio circuit 506 can provide an audio interface between the user and the electronic device 10 through a speaker and a microphone. The audio circuit 506 can convert the received audio data into an electrical signal, transmit it to the speaker, and convert it into a sound signal for output; on the other hand, the microphone converts the collected sound signal into an electrical signal, which is received by the audio circuit 506 and converted into audio data, and then the audio data is output to the processor 508 for processing, and then sent to another electronic device 10 through the radio frequency circuit 501, or the audio data is output to the memory 502 for further processing. The audio circuit 506 may also include an earphone socket to provide communication between an external earphone and the electronic device 10.

[0093] Wireless Fidelity (WiFi) is a short-range wireless transmission technology. The electronic device 10 can help users send and receive emails, browse web pages, and access streaming media through the wireless fidelity module 507, which provides users with wireless broadband Internet access. Fig.14 The wireless fidelity module 507 is shown, but it is understandable that it is not a necessary component of the electronic device 10 and can be omitted as needed without changing the essence of the invention.

[0094] The processor 508 is the control center of the electronic device 10. It uses various interfaces and lines to connect various parts of the entire electronic device 10. By running or executing applications stored in the memory 502 and calling data stored in the memory 502, it executes various functions of the electronic device 10 and processes data, thereby monitoring the electronic device 10 as a whole. Optionally, the processor 508 may include one or more processing cores; preferably, the processor 508 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 508.

[0095] The electronic device 10 also includes a power supply 509 for supplying power to various components. Preferably, the power supply 509 can be logically connected to the processor 508 through a power management system, so that the power management system can manage charging, discharging, and power consumption. The power supply 509 can also include one or more DC or AC power supplies, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and other arbitrary components.

[0096] although Fig.14 Not shown, the electronic device 10 may also include a Bluetooth module, etc., which will not be described in detail here. In specific implementation, the above modules can be implemented as independent entities, or can be arbitrarily combined and implemented as the same or several entities. The specific implementation of the above modules can refer to the previous method embodiment, which will not be described in detail here.

[0097] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A piezoelectric drive mechanism, characterized in that: include: Bracket; a mover, movably disposed on the bracket; and The piezoelectric driver is arranged on the support, and part of the piezoelectric driver can move relative to the support to drive the mover to move relative to the support in at least one direction.

2. The piezoelectric drive mechanism according to claim 1, characterized in that: The piezoelectric drive mechanism further comprises an elastic member, which is arranged on the bracket and located at a side of the piezoelectric driver facing away from the mover, and the elastic member elastically presses the piezoelectric driver against the mover.

3. The piezoelectric drive mechanism according to claim 2, characterized in that: The bracket includes a bottom wall and a side wall arranged around the bottom wall, the mover is slidably arranged on the bottom wall, the piezoelectric driver is located on the side of the mover facing away from the bottom wall, the elastic member is located on the side of the piezoelectric driver facing away from the mover, and the opposite ends of the elastic member are respectively connected to the two opposite side walls one by one, and the piezoelectric driver is arranged on the elastic member.

4. The piezoelectric drive mechanism according to claim 3, characterized in that: The piezoelectric drive mechanism further comprises a cover body, which is arranged on an end of the side wall away from the bottom wall and shields the elastic member and the piezoelectric drive.

5. The piezoelectric drive mechanism according to claim 1, characterized in that: The piezoelectric drive mechanism further includes a friction member, which is fixedly disposed on the mover, and the piezoelectric driver is in contact with the friction member.

6. The piezoelectric drive mechanism according to claim 1, characterized in that: The piezoelectric drive mechanism further includes a rolling element. The mover and the bracket are provided with corresponding rolling grooves. The rolling element is arranged in the rolling grooves of the mover and the bracket and is in rolling cooperation with the mover and the bracket.

7. The piezoelectric drive mechanism according to claim 6, characterized in that: The bracket is provided with a sliding groove, and the mover includes a sliding part and two matching parts. The sliding part can be slidably arranged in the sliding groove, and the two matching parts are connected to the opposite sides of the sliding part. The rolling groove is arranged on the two sliding parts, and the two matching parts are slidably matched with the bracket through the rolling element.

8. The piezoelectric drive mechanism according to claim 7, characterized in that: The mover further comprises a connecting portion which is arranged on a side of the sliding portion facing away from the piezoelectric driver, and the connecting portion is exposed to the bracket through the sliding groove.

9. The piezoelectric drive mechanism according to claim 1, characterized in that: The piezoelectric drive mechanism also includes a circuit structure, the piezoelectric driver is electrically connected to the circuit structure, a notch is provided on the side wall of the bracket, a groove body connected to the notch is also provided on the outer side of the side wall of the bracket, and a portion of the circuit structure passes through the notch and forms a contact in the groove body.

10. The piezoelectric drive mechanism according to claim 1, characterized in that: The piezoelectric driver includes an elastic base, a piezoelectric layer and a friction head. The piezoelectric layer is arranged on at least two intersecting sides of the elastic base. The piezoelectric layer on each side is provided with a plurality of first electrodes. The friction head is arranged on the elastic base or the piezoelectric layer. Under the action of different driving voltages, each of the first electrodes can excite the piezoelectric driver to produce different vibration modes with orthogonal directions, so that the friction head produces displacement components along two orthogonal directions on a preset plane to drive the mover to move in different directions along a target plane, and the target plane is perpendicular to the preset plane.

11. A camera module, characterized in that: It comprises a lens group, an image sensor and a piezoelectric driving mechanism as described in any one of claims 1 to 10, wherein the image sensor is arranged on the light-emitting side of the lens group, and the mover of the piezoelectric driving mechanism is connected to the lens group or the image sensor and is used to drive the lens group or the image sensor to move along the optical axis.

12. An electronic device, characterized in that: Including the camera module as described in claim 11.

Images