WO2023051118A1

WO2023051118A1 - Driver and manufacturing method therefor, driving apparatus, camera module, and electronic device

Info

Publication number: WO2023051118A1
Application number: PCT/CN2022/114850
Authority: WO
Inventors: 李飞; 刘金凤; 何雨航; 高翔宇; 郭靖余; 任凯乐; 夏颂; 徐卓; 陈伟
Original assignee: Oppo广东移动通信有限公司
Priority date: 2021-09-30
Filing date: 2022-08-25
Publication date: 2023-04-06
Also published as: CN115914784A

Abstract

The present application provides a driver and a manufacturing method therefor, a driving apparatus, a camera module, and an electronic device. The driver comprises a plurality of stacked piezoelectric bodies and an abutting member arranged on one side of the piezoelectric bodies; each of the piezoelectric bodies comprises a first electrode layer and a second electrode layer arranged opposite to each other; two adjacent piezoelectric bodies are bonded by means of the first electrode layers on the two piezoelectric bodies, and/or two adjacent piezoelectric bodies are bonded by means of the second electrode layers on the two piezoelectric bodies. According to the driver and the manufacturing method therefor, the driving apparatus, the camera module, and the electronic device provided in the present application, the input power of the driver can be improved by providing a stacked structure of the plurality of piezoelectric bodies, so that a larger driving force is obtained. Two adjacent piezoelectric bodies are directly bonded by means of the first electrode layers and/or the second electrode layers, so that the overall thickness of the driver can be further reduced to obtain a larger driving force and achieve large-stroke driving.

Description

Driver and manufacturing method thereof, driving device, camera module, electronic equipment

This application claims the priority of the Chinese patent application with the application number 202111165760.4 filed on September 30, 2021, and the title of the invention is "driver and its manufacturing method, drive device, camera module, electronic equipment", which is by reference All are incorporated into this application.

technical field

The present application relates to the technical field of electronic equipment structure, in particular to a driver and a manufacturing method thereof, a driving device, a camera module, and electronic equipment.

Background technique

With the development of portable electronic devices such as smartphones and tablet computers and smart wearable devices, users' demands on the image quality of terminal devices are increasing day by day. The motor is an important part of the image module and plays a vital role in the performance of Autofocus (AF) and Optical Image Stabilization (OIS).

At this stage, most of the motors used in mobile terminals such as mobile phones have defects such as complex structures, short driving strokes, and low driving efficiency.

Contents of the invention

On the one hand, an embodiment of the present application provides a driver. The driver includes a plurality of stacked piezoelectric bodies and a holding member provided on one side of the piezoelectric body; each piezoelectric body includes an oppositely arranged The first electrode layer and the second electrode layer; wherein, two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/or, two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies. The second electrode layer on the two piezoelectric bodies is bonded.

On the other hand, the embodiment of the present application also provides a method for manufacturing a driver, the driver includes a plurality of piezoelectric bodies, each of the piezoelectric bodies includes a first surface and a second surface oppositely arranged, the manufacturing method The method includes: obtaining the simulated size of the piezoelectric body, and obtaining a plurality of piezoelectric bodies according to the simulated size; forming a first electrode layer on the first surface of each piezoelectric body, and forming a first electrode layer on each piezoelectric body. forming a second electrode layer on the second surface of the piezoelectric body; stacking a plurality of the piezoelectric bodies in such a way that the polarization directions of two adjacent piezoelectric bodies point to the opposite direction; solidifying the stacked multiple piezoelectric bodies The piezoelectric body; wherein, two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/or, two adjacent piezoelectric bodies are bonded through the two piezoelectric bodies The second electrode layer on the electrical body is bonded.

Still another aspect of the embodiment of the present application provides a driving device, the driving device includes a moving body and a driver; the driver includes a plurality of stacked piezoelectric bodies and a support provided on one side of the piezoelectric body member, the holding member abuts against the moving body for driving the moving body to move; wherein, each piezoelectric body includes a first electrode layer and a second electrode layer oppositely arranged; adjacent Two piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/or, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies catch.

Another aspect of the embodiment of the present application provides a camera module, the camera module includes a lens and a driving device; the driving device includes a moving body and the driver, and the lens is connected to the moving body; The driver includes a plurality of stacked piezoelectric bodies and a holding piece provided on one side of the piezoelectric body, and the holding piece abuts against the moving body to drive the moving body to move; wherein , each piezoelectric body includes a first electrode layer and a second electrode layer oppositely arranged; two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/or , two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies.

Another aspect of the embodiment of the present application provides an electronic device, the electronic device includes a display screen, a housing, a circuit board, and a camera module, and the camera module is connected to the housing or the display screen; The casing and the display screen cooperate to form an accommodating space, and the circuit board is arranged in the accommodating space and is electrically connected with the camera module and the display screen; the camera module includes a lens and a driving device , the driving device includes a moving body and the driver, the lens is connected to the moving body; the driver includes a plurality of stacked piezoelectric bodies and a holding piece arranged on one side of the piezoelectric body, The holding member abuts against the moving body for driving the moving body to move; wherein, each piezoelectric body includes a first electrode layer and a second electrode layer oppositely arranged; two adjacent The piezoelectric body is bonded through the first electrode layer on the two piezoelectric bodies, and/or, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies.

The driver and its manufacturing method, driving device, camera module, and electronic equipment provided in the embodiments of the present application can increase the input power of the driver by setting a stacked structure of multiple piezoelectric bodies, thereby obtaining greater driving force. In addition, under the condition that the total thickness of the driver remains unchanged, the multilayer piezoelectric body stack structure can effectively reduce the driving voltage of the driver. In addition, in this embodiment, the first electrode layer and the second electrode layer are oppositely arranged so that the piezoelectric body can realize the corresponding vibration mode, and at the same time, the adjacent electrodes are directly bonded through the first electrode layer and/or the second electrode layer. The two piezoelectric bodies can further reduce the overall thickness of the driver to obtain greater driving force and realize large stroke driving.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of the front structure of an electronic device in some embodiments of the present application;

Fig. 2 is a schematic diagram of the rear structure of the electronic device in the embodiment of Fig. 1;

Fig. 3 is a schematic diagram of the structural disassembly of the camera module in some embodiments of the present application;

Fig. 4 is a schematic diagram of the structural disassembly of the driving device in some embodiments of the present application;

Fig. 5 is a schematic structural diagram of the cooperation between the driver and the clamping member in the embodiment of Fig. 4;

Fig. 6 is a schematic structural view of a clip in some embodiments of the present application;

Fig. 7 is a schematic structural view of a clip in another embodiment of the present application;

Fig. 8 is a schematic structural diagram of a driving device in another embodiment of the present application;

Fig. 9 is a schematic cross-sectional structure diagram of the driving device along the A-A direction in the embodiment of Fig. 8;

Fig. 10 is a schematic cross-sectional structure diagram of a driving device in another embodiment of the present application;

Fig. 11 is a partial structural schematic diagram of the driving device in other embodiments of the present application;

Fig. 12 is a schematic top view of the driving device in some embodiments of the present application;

Fig. 13 is a schematic cross-sectional structure diagram of the driving device along the B-B direction in the embodiment of Fig. 12;

Fig. 14 is a schematic structural diagram of a driver in some embodiments of the present application;

Fig. 15 is a schematic structural view of the piezoelectric body in the embodiment of Fig. 14;

Fig. 16 is a schematic structural diagram of a driver in another embodiment of the present application;

Fig. 17 is a schematic structural diagram of a driver in other embodiments of the present application;

Fig. 18 is a schematic structural diagram of a driver in other embodiments of the present application;

Fig. 19 is a schematic structural view of the piezoelectric body in the embodiment of Fig. 18;

FIG. 20 is a schematic structural diagram of a driver in other embodiments of the present application;

Fig. 21 is a schematic structural diagram of a driver in other embodiments of the present application;

Fig. 22 is a schematic diagram of the displacement output of the driver in the X direction in some embodiments of the present application;

Fig. 23 is a schematic diagram of the displacement output of the driver in the Y direction in some embodiments of the present application;

Fig. 24 is a schematic flow chart of a manufacturing method of a driver in some embodiments of the present application;

Fig. 25 is a schematic diagram of comparison of driver simulation and test results in some embodiments of the present application;

Fig. 26 is a schematic structural diagram of a stacking device in some embodiments of the present application;

Fig. 27 is a schematic diagram of a disassembled structure of the stacking device in the embodiment of Fig. 26;

Fig. 28 is a schematic diagram of the relationship curve between the output speed of the driving device and the driving voltage in some embodiments of the present application.

Detailed ways

The application will be described in further detail below in conjunction with the accompanying drawings and embodiments. In particular, the following examples are only used to illustrate the present application, but not to limit the scope of the present application. Likewise, the following embodiments are only some of the embodiments of the present application but not all of them, and all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In one embodiment, the polarization direction of each piezoelectric body is the same; the polarization direction is the direction in which the first electrode layer points to the second electrode layer, or the polarization direction is the direction in which the first electrode layer points to the second electrode layer. The second electrode layer points to the direction of the first electrode layer.

In one embodiment, in the stacking direction of the plurality of piezoelectric bodies, the directions of polarization of two adjacent piezoelectric bodies are opposite.

In one embodiment, the first electrode layer and the second electrode layer are made of conductive silver paste or conductive glue.

In one embodiment, each piezoelectric body includes a first surface and a second surface oppositely disposed, the first electrode layer is formed on the first surface, and the second electrode layer is formed on the first surface. Two surfaces; wherein, the extension directions of the adjacent two edges of the first surface or the second surface are respectively the first direction and the second direction, and the first electrode layer covers the first surface along the second The edge extending in the first direction, the second electrode layer covers the edge extending in the first direction on the second surface.

In one embodiment, the first electrode layer is divided into first electrodes and second electrodes arranged at intervals along the first direction, and the side surfaces of the plurality of piezoelectric bodies are provided with first external electrodes and second external electrodes. and a third external electrode; the first electrodes on each of the piezoelectric bodies are connected in parallel through the first external electrodes, and the second electrodes on each of the piezoelectric bodies are connected in parallel through the second external electrodes, The second electrode layer on each piezoelectric body is connected in parallel through the third external electrode.

In one embodiment, the first electrode layer is spaced apart from at least one of two opposite edges extending along the first direction of the first surface; the second electrode layer is spaced apart from the second surface along the Two oppositely arranged edges extending in the second direction are arranged at intervals.

In an embodiment, the first electrode and the second electrode are respectively applied with a sine or cosine AC voltage with a phase difference of ±k(pi/2), wherein k is an integer.

In an embodiment, the first electrode layer is divided into a first electrode, a second electrode, a third electrode and a fourth electrode arranged in an array, and the first electrode and the third electrode are arranged diagonally , the second electrode and the fourth electrode are arranged diagonally; wherein, the driving voltage applied to the first electrode and the third electrode is the same, and the driving voltage applied to the second electrode and the fourth electrode The driving voltages on the electrodes are the same.

In one embodiment, a first external electrode, a second external electrode, a third external electrode, a fourth external electrode and a fifth external electrode are provided on the side surfaces of the plurality of piezoelectric bodies, and each of the piezoelectric bodies The first electrodes of each piezoelectric body are connected in parallel through the first external electrodes, the second electrodes on each piezoelectric body are connected in parallel through the second external electrodes, and the third electrodes on each piezoelectric body are connected in parallel through the second external electrodes. The third external electrode is connected in parallel, the fourth electrode on each piezoelectric body is connected in parallel through the fourth external electrode, and the second electrode layer on each piezoelectric body is connected in parallel through the fifth external electrode Realize parallel connection.

In one embodiment, the phase difference between the driving voltage applied to the first electrode and the third electrode and the driving voltage applied to the second electrode and the fourth electrode is ±k(pi/ 2), wherein, k is an integer.

In an embodiment, the supporting member is arranged at a central position or an axisymmetric position of the piezoelectric body along the first direction or the second direction of the piezoelectric body.

In one embodiment, the step of stacking a plurality of piezoelectric bodies includes: providing a stacking device, the stacking device includes a base and a partition, a stacking groove is formed on the base, and the partition includes a stacking part; the stacking part can be accommodated in the stacking groove, and can move along the depth direction of the stacking groove; a plurality of piezoelectric bodies of each driver are stacked in the stacking groove, and are located in the corresponding Adjacent between two stacked sections.

In one embodiment, the contact surface between the supporting member and the moving body can generate an elliptical trajectory movement, so as to push the moving body to perform macroscopic linear motion.

In an embodiment, the driving device further includes a bracket for mounting the lens, and the bracket is multiplexed as the moving body.

In one embodiment, the drive device further includes a bracket for mounting the lens and a base with a receiving groove, the bracket and the driver are accommodated in the receiving groove, and the driver is provided with Between the bracket and the base; wherein, the bracket is reused as the moving body.

"Electronic equipment" (or simply "terminal") as used herein includes, but is not limited to, configured to direct cable connection, and/or another data connection/network) and/or via (for example, for cellular networks, wireless local area networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters , and/or a device for receiving/sending communication signals via a wireless interface of another communication terminal.

A communication terminal arranged to communicate over a wireless interface may be referred to as a "wireless communication terminal", "wireless terminal" or "mobile terminal". Examples of mobile terminals include, but are not limited to, satellite or cellular telephones; Personal Communications Systems (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data communication capabilities; may include radiotelephones, pagers, Internet/Intranet access , a PDA with a web browser, organizer, calendar, and/or Global Positioning System (GPS) receiver; and a conventional laptop and/or palm-type receiver or other electronic device including a radiotelephone transceiver.

The "electronic device" used here may further include, but is not limited to, driving the lens to focus through a piezoelectric driver to realize the image function of the electronic device, and optical image stabilization may be implemented during the focusing process to improve the image effect of the electronic device.

For example, the piezoelectric actuator can be an electromagnetic motor, which is mainly driven by the Lorentz force. However, the driving force of the electromagnetic motor is low, which cannot meet the driving requirements of heavy mirror groups and long strokes. In addition, the use of magnets will lead to potential magnetic interference risks, and this risk will increase with the increase of cameras, which is not conducive to the use of multi-camera scenarios.

Based on this, the embodiment of the present application aims to provide an electronic device that can drive a lens or lens group based on a piezoelectric driver to meet the AF and OIS functional requirements of a large-weight lens/mirror group and long-stroke drive requirements. . It can be understood that a piezoelectric actuator refers to a device that uses piezoelectric materials (lead zirconate titanate, etc.) to convert electrical energy into mechanical energy or mechanical motion by using the inverse piezoelectric effect (length expansion, thickness expansion, etc.).

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematic diagram of the front structure of an electronic device 1000 in some embodiments of the present application, and FIG. 2 is a schematic diagram of a rear structure of the electronic device 1000 in the embodiment of FIG. Tablets, laptops, wearables, etc. In the embodiment of the present application, the electronic device 1000 takes a mobile phone as an example.

The electronic device 1000 generally includes the following structures: a camera module 100 , a display screen 200 , a casing 300 and a circuit board 400 . The electronic device in this embodiment may include multiple camera modules 100 . The camera module 100 may be connected with the display screen 200 or the casing 300 (forming a front and rear camera structure). The display screen 200 and the casing 300 cooperate to form a receiving space, and the circuit board 400 is arranged in the receiving space, and the circuit board 400 is electrically connected with the camera module 100 and the display screen 200 . The circuit board 400 is used to control the working status of the camera module 100 and the display screen 200 . The detailed technical features of the structure of other parts of the electronic device are within the comprehension scope of those skilled in the art, so the present application will not repeat them here.

Please refer to FIG. 3 . FIG. 3 is a schematic exploded view of a camera module 100 in some embodiments of the present application. The camera module 100 may roughly include a driving device 10 and a lens 20 . The driving device 10 is disposed in the accommodating space for positioning and installing the camera module 100 . The lens 20 can move under the driving of the driving device 10 to realize the focusing function of the camera module 100 . Wherein, the lens 20 may be in a structural form including multiple groups of lenses, and the detailed structural features of the lens 20 are within the comprehension scope of those skilled in the art, so the present application will not repeat them here.

It can be understood that the camera module 100 may further include an image sensor (not shown in the figure), which is disposed corresponding to the light-emitting surface of the lens 20 and electrically connected to the circuit board 400 . Wherein, the imaging effect can be adjusted by adjusting the distance between the lens 20 and the image sensor, that is, focusing, that is, the lens 20 can approach or move away from the image sensor driven by the driving device 10 .

Please refer to FIG. 4 and FIG. 5 . FIG. 4 is a schematic disassembled structural diagram of the driving device 10 in some embodiments of the present application, and FIG. 5 is a schematic structural diagram of the cooperation between the driver 13 and the clamping member 14 in the embodiment of FIG. 4 . The driving device 10 generally includes a base 11 , a bracket 12 , a driver 13 and a clamping member 14 . The driver 13 may include a piezoelectric body 131 and a holding member 132 disposed on one side of the piezoelectric body 131 . The driver 13 can drive the bracket 12 to move under the control of the circuit board 400 , and the base 11 is arranged in the accommodation space for positioning and installing the driving device 10 , that is, the base 11 can be connected with the display screen 200 or the housing 300 . For example, the base 11 can be connected and fixed to the housing 300 by screwing, inserting, buckling, bonding, welding and other connection methods.

The base 11 is provided with an accommodating groove 110 , the bracket 12 and the driver 13 are accommodated in the accommodating groove 110 , and the bracket 12 can move relative to the accommodating groove 110 ie the base 11 driven by the driver 13 . The bracket 12 is used for installing the lens 20 and can drive the lens 20 to move so as to realize the focusing effect. In one embodiment, the bracket 12 is provided with a mounting hole 120 passing through the bracket 12 along the optical axis direction of the lens 20, and the lens 20 is arranged corresponding to the mounting hole 120, so that the light passing through the lens 20 can be transmitted through the mounting hole 120 to the image sensor. For example, the lens 20 is installed in the mounting hole 120, and can be connected and fixed with the bracket 12 by screwing, inserting, buckling, bonding, welding, etc., so that the light passing through the lens 20 can be transmitted to the image. sensor. Of course, the lens 20 and the bracket 12 may also be assembled in other ways, which will not be listed one by one.

In one embodiment, a light hole 111 corresponding to the mounting hole 120 is defined on the bottom wall of the accommodating groove 110 , and the image sensor is disposed on a side of the accommodating groove 110 away from the bracket 12 . Wherein, the light hole 111 is provided corresponding to the lens 20, so that the light passing through the lens 20 can be transmitted to the image sensor.

The driver 13 is disposed between the bracket 12 and the base 11 and connected to the bracket 12 and the base 11 respectively. The clamping part 14 is disposed on a side of the piezoelectric body 131 away from the holding part 132 for clamping and positioning the piezoelectric body 131 . The piezoelectric body 131 is configured to generate vibrations to drive the top holder 132 to move. An end of the holding member 132 facing away from the piezoelectric body 131 abuts against the support 12 , so that the holding member 132 can drive the support 12 to move.

In one embodiment, the piezoelectric body 131 is disposed at a distance from the bracket 12 , and the supporting member 132 is disposed on a side of the piezoelectric body 131 close to the bracket 12 and abuts against the bracket 12 . Wherein, the piezoelectric body 131 can be made of piezoelectric material, so that it can be deformed under the drive of voltage, so as to drive the top holder 132 to move, and then drive the bracket 12 to move to realize focusing.

In one embodiment, the supporting member 132 may be in the shape of a cylinder, a sphere, a cone, a rectangle, etc., which will not be repeated here. The supporting member 132 can be made of wear-resistant materials such as alumina (Al2O3), silicon oxide (SiO2), zirconia (ZrO2), carbon fiber, polyester fiber, etc., which can ensure that the deformation driving force of the piezoelectric body 131 is good. It can be transmitted to the bracket 12, and at the same time, it can also prevent the wear of the supporting member 132 under long-term work, so as to maintain the matching accuracy.

Wherein, the holding member 132 can be bonded to the piezoelectric body 131 by epoxy resin. Of course, in other embodiments, the holding member 132 can also be connected with The connection of the piezoelectric body 131 is fixed and will not be described in detail.

In one embodiment, the bracket 12 is provided with a sliding piece 121 on the side close to the driver 13, that is, the top holding piece 132. The frictional force between the element 132 and the sliding element 121 drives the bracket 12 to move. In one embodiment, the sliding member 121 can be bonded to the bracket 12 by epoxy resin. Of course, in other embodiments, the sliding member 121 can also be connected and fixed to the bracket 12 through screw connection, plug connection, buckle, welding and other connection methods.

Wherein, the sliding member 121 is generally a sheet-like structural member or a plate-like structural member, and is disposed on the outer surface of the bracket 12 . Certainly, the sliding member 121 can also be in other shapes, which will not be repeated here. The sliding member 121 can be made of wear-resistant materials such as alumina (Al2O3), silicon oxide (SiO2), zirconia (ZrO2), carbon fiber, polyester fiber, etc., which can ensure that the deformation driving force of the piezoelectric body 131 can pass through the top The holding part 132 and the sliding part 121 are well transmitted to the bracket 12 , and at the same time, it can also prevent the holding part 132 and the sliding part 121 from being worn out under long-time working, so as to maintain the matching accuracy.

It can be understood that point-to-surface contact, line-to-surface contact or surface-to-surface contact can be formed between the holding member 132 and the sliding member 121 to drive the bracket 12 to move under the drive of the piezoelectric body 131 . For example, the supporting member 132 may be a cone, and its cone angle abuts against the sliding member 121 to form a point-surface contact. In some embodiments, there may be multiple holding pieces 132 , the holding pieces 132 are disposed on the same side of the piezoelectric body 131 , and the holding pieces 132 abut against the sliding piece 121 respectively. Certainly, in some other embodiments, there may be multiple supporting pieces 132 and multiple sliding pieces 121 , and the multiple supporting pieces 132 abut against the multiple sliding pieces 121 respectively. It should be understood that the supporting member 132 and the sliding member 121 may also have other corresponding relationships, which will not be repeated here.

Wherein, the contact surface of the holding member 132 and the sliding member 121 can be polished so that the roughness of the contact surface of the holding member 132 and the sliding member 121 is suitable for torque transmission between the piezoelectric body 131 and the bracket 12 . In addition, wear-resistant materials with high hardness are selected for the supporting member 132 and the sliding member 121, which can ensure the smoothness of the contact surfaces under long-time working conditions. In addition, since the sliding member 121 is in contact with the holding member 132 , the sliding member 121 and the holding member 132 can transmit motion to the bracket 12 through friction, so that the bracket 12 drives the lens to move in the focusing direction.

Please refer to FIG. 6 . FIG. 6 is a schematic structural view of the clip 14 in some embodiments of the present application. The clip 14 generally includes a first side wall 141 , a second side wall 142 and a bottom wall 143 . The bottom wall 143 is arranged on the side of the piezoelectric body 131 away from the top holder 132 , the first side wall 141 and the second side wall 142 are respectively bent and connected to the bottom wall 143 , and are arranged on the side of the bottom wall 143 close to the piezoelectric body 131 same side. In one embodiment, the first side wall 141 and the second side wall 142 respectively extend from opposite ends of the bottom wall 143 along the optical axis of the lens 20 toward a direction away from the bottom wall 143, and the first side wall 141 and The second sidewalls 142 are respectively vertically bent and connected to the bottom wall 143 . Wherein, the first side wall 141 , the second side wall 142 and the bottom wall 143 cooperate to form a clamping groove 140 for clamping the piezoelectric body 131 to ensure a stable working state of the piezoelectric body 131 .

The inner side wall of the clamping member 14 is protruded with a protrusion 144 against the piezoelectric body 131, that is, the protrusion 144 is protruded from the inner side wall of the clamping groove 140, so that the piezoelectric body 131 and the piezoelectric body 131 The inner side walls of the clamping grooves 140 are arranged at intervals to limit the degree of freedom of the piezoelectric body 131 without affecting the deformation and vibration of the piezoelectric body 131 . It can be understood that the piezoelectric body 131 will produce longitudinal and tangential deformations during the working process. By setting the connection mode in which the protrusion 144 is in contact with the side part of the piezoelectric body 131, the vibration of the piezoelectric body 131 will not be affected. In some cases, the degree of freedom is restricted to ensure the stable working state of the piezoelectric body 131 .

Wherein, the surface of the protruding portion 144 close to the piezoelectric body 131 may be an arc surface or a plane.

In one embodiment, the surface of the first side wall 141 close to the piezoelectric body 131 is protruded with a first protrusion 144a, and the surface of the first protrusion 144a close to the piezoelectric body 131 is roughly arc-shaped, so that the second A protrusion 144a forms a line-surface contact with the piezoelectric body 131 . The first protruding portion 144 a abuts against the piezoelectric body 131 , so that the piezoelectric body 131 is spaced apart from the first sidewall 141 . Wherein, the first protruding portion 144a can be a cylinder, a semi-cylinder, a sphere, a hemisphere, and the like.

Wherein, the first protruding portion 144 a can be abutted against the centerline of the surface of the piezoelectric body 131 close to the first side wall 141 . Certainly, in another embodiment, multiple first protrusions 144a may be provided, and the plurality of first protrusions 144a may abut against the symmetrical position along the midline of the surface of the piezoelectric body 131 close to the first side wall 141 . The piezoelectric body 131 .

In one embodiment, the surface of the second side wall 142 close to the piezoelectric body 131 is protruded with a second protrusion 144b, and the surface of the second protrusion 144b close to the piezoelectric body 131 is roughly arc-shaped, so that the first The two protrusions 144b form a line-surface contact with the piezoelectric body 131 . The second protruding portion 144b abuts against the piezoelectric body 131 such that the piezoelectric body 131 is spaced apart from the second sidewall 142 . Wherein, the second protruding portion 144b can be a cylinder, a semi-cylinder, a sphere, a hemisphere, and the like.

Wherein, the second protruding portion 144b can abut against the centerline of the surface of the piezoelectric body 131 close to the second side wall 142 . Of course, in another embodiment, multiple second protrusions 144b may be provided, and the plurality of second protrusions 144b may abut on the symmetrical position along the midline of the surface of the piezoelectric body 131 close to the second side wall 142 . The piezoelectric body 131 .

In one embodiment, the surface of the bottom wall 143 close to the piezoelectric body 131 protrudes from a third protrusion 144c, and the surface of the third protrusion 144c close to the piezoelectric body 131 is roughly arc-shaped, so that the third protrusion The raised portion 144c forms a line-surface contact with the piezoelectric body 131 . The third protruding portion 144c abuts against the piezoelectric body 131 such that the piezoelectric body 131 is spaced apart from the bottom wall 143 . Wherein, the third protruding part 144c may be a cylinder, a semi-cylinder, a sphere, a hemisphere and the like.

Wherein, the third protruding portion 144c can abut against the centerline of the surface of the piezoelectric body 131 close to the bottom wall 143 . Of course, in another embodiment, multiple third protrusions 144c may be provided, and the plurality of third protrusions 144c may abut against the piezoelectric body 131 symmetrically along the midline of the surface of the piezoelectric body 131 close to the bottom wall 143 . Ontology 131.

It can be understood that the surfaces of the first protruding portion 144a, the second protruding portion 144b and the third protruding portion 144c close to the piezoelectric body 131 may also be flat, that is, the first protruding portion 144a, the second protruding portion 144b and the third protruding portion 144c respectively form surface-to-surface contact with a part of the surface of the piezoelectric body 131 .

In one embodiment, the clamping member 14 may have a clamping portion 145 clamped on opposite ends of the piezoelectric body 131 to ensure a stable working state of the piezoelectric body 131 .

Specifically, the clamping portion 145 may include a first clamping portion 145a and a second clamping portion 145b oppositely disposed. The first clamping portion 145 a extends from the first side wall 141 toward the direction close to the piezoelectric body 131 , and cooperates with the first side wall 141 to form a first clamping groove 140 a. That is, the side of the first side wall 141 close to the piezoelectric body 131 is provided with a first clamping portion 145a. The second clamping portion 145b extends from the second side wall 142 towards the direction close to the piezoelectric body 131 , and cooperates with the second side wall 142 to form a second clamping groove 140b. That is, the side of the second side wall 142 close to the piezoelectric body 131 is provided with a second clamping portion 145b. The first clamping groove 140 a and the second clamping groove 140 b respectively clamp two opposite ends of the piezoelectric body 131 along the optical axis of the lens 20 . That is, the first clamping portion 145 a and the second clamping portion 145 b are disposed opposite to each other along the optical axis of the camera module 100 , and respectively clamp opposite ends of the piezoelectric body 131 . Wherein, the first protruding portion 144a is accommodated in the first clamping portion 145a, and the second protruding portion 144b is accommodated in the second clamping groove 140b.

In one embodiment, the clamping part 14 can be made of plastic material, and the clamping part 14 with the above structure is formed through an integral molding process. For example, clip 14 may be formed by injection molding.

The clamping piece provided in the embodiment of the present application is provided with a protrusion to abut against the piezoelectric body, so that the piezoelectric body and the clamping piece are spaced apart, and the piezoelectric body is clamped by setting the clamping portion, so that the piezoelectric body The position is limited to limit the vibration freedom of the piezoelectric body in the clamp without affecting the vibration of the piezoelectric body, so that the vibration of the piezoelectric body can be converted into the movement of the top holder to the maximum extent, thereby improving driving force. In addition, the protrusions are respectively arranged corresponding to the centerline of the surface of the piezoelectric body or at symmetrical positions of the centerline of the surface, so as to limit the degree of freedom of the piezoelectric body without affecting the deformation and vibration of the piezoelectric body. In addition, the piezoelectric body is driven by voltage to generate slight vibrations, which can immediately stop the driving device in the event of a power failure, realizing self-locking without noise. It should be noted that the terms "first", "second", and "third" in the present invention are only used for descriptive purposes, and should not be understood as indicating or implying relative importance or implicitly indicating the indicated technical features. quantity. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features.

Please refer to FIG. 7. FIG. 7 is a schematic structural view of the clip 14 in another embodiment of the present application. The clip 14 may roughly include a first side wall 141, a second side wall 142 and a bottom wall 143. The first side wall 141 , the second side wall 142 and the bottom wall 143 can refer to the aforementioned embodiments. Wherein, the first side wall 141 , the second side wall 142 and the bottom wall 143 cooperate to form a clamping groove 140 for clamping the piezoelectric body 131 to ensure a stable working state of the piezoelectric body 131 .

In one embodiment, the surface of the first side wall 141 close to the piezoelectric body 131 is protruded with a first protrusion 144a, and the surface of the first protrusion 144a close to the piezoelectric body 131 is substantially planar, so that the first protrusion 144a The raised portion 144a is in surface-to-surface contact with a part of the surface of the piezoelectric body 131 . The first protruding portion 144 a abuts against the piezoelectric body 131 , so that the piezoelectric body 131 is spaced apart from the first sidewall 141 . Wherein, the first protruding portion 144a may be a rectangular body, a trapezoidal body, or the like.

In one embodiment, the surface of the second side wall 142 close to the piezoelectric body 131 is protruded with a second protrusion 144b, and the surface of the second protrusion 144b close to the piezoelectric body 131 is substantially flat, so that the second protrusion 144b The raised portion 144b is in surface-to-surface contact with a part of the surface of the piezoelectric body 131 . The second protruding portion 144b abuts against the piezoelectric body 131 such that the piezoelectric body 131 is spaced apart from the second sidewall 142 . Wherein, the second protruding portion 144b may be a rectangular body, a trapezoidal body, or the like.

In one embodiment, the surface of the bottom wall 143 close to the piezoelectric body 131 is bent to form a convex curved surface 143a, and the convex curved surface 143a forms a line-surface contact with the piezoelectric body 131, so that the piezoelectric body 131 and the convex curved surface 143a Non-contact area interval setting.

Wherein, the convex curved surface 143a can abut against the centerline of the surface of the piezoelectric body 131 close to the bottom wall 143 . Certainly, in another embodiment, a plurality of contact areas are formed between the convex curved surface 143a and the piezoelectric body 131 , and the plurality of contact areas can be abutted at symmetrical positions along the midline of the surface of the piezoelectric body 131 near the bottom wall 143 on the piezoelectric body 131 .

It can be understood that for the technical features of the clip 14 , the first protruding portion 144 a and the second protruding portion 144 b that are not described in detail, reference may be made to the foregoing embodiments, and details will not be repeated in this embodiment.

Specifically, the clamping portion 145 may include a first clamping portion 145a and a second clamping portion 145b oppositely disposed. The first clamping portion 145a extends from the first protruding portion 144a toward the direction close to the second side wall 142 , and cooperates with the first protruding portion 144a to form a first clamping groove 140a. That is, a first clamping portion 145a is provided on a side of the first protruding portion 144a close to the piezoelectric body 131 . The second clamping portion 145b extends from the second protruding portion 144b toward the direction close to the first side wall 141 , and cooperates with the second protruding portion 144b to form a second clamping groove 140b. That is, a second clamping portion 145b is formed on a side of the second protruding portion 144b close to the piezoelectric body 131 . The first clamping groove 140 a and the second clamping groove 140 b respectively clamp two opposite ends of the piezoelectric body 131 along the optical axis of the lens 20 . That is, the first clamping portion 145 a and the second clamping portion 145 b are disposed opposite to each other along the optical axis of the camera module 100 , and respectively clamp opposite ends of the piezoelectric body 131 .

In one embodiment, the first clamping portion 145 a and the second clamping portion 145 b are disposed opposite to each other along the optical axis of the camera module 100 , and respectively clamp opposite ends of the piezoelectric body 131 .

The clamping piece provided in the embodiment of the present application is provided with a protrusion to abut against the piezoelectric body, so that the piezoelectric body and the clamping piece are spaced apart, and the piezoelectric body is clamped by setting the clamping portion, so that the piezoelectric body Limiting is performed to limit the vibration freedom of the piezoelectric body without affecting the vibration of the piezoelectric body. In addition, the protrusions are respectively arranged corresponding to the centerline of the surface of the piezoelectric body or at symmetrical positions of the centerline of the surface, so as to limit the degree of freedom of the piezoelectric body without affecting the deformation and vibration of the piezoelectric body.

It can be understood that the degree of freedom of vibration means that the motion of molecules consists of three parts: translation, rotation and vibration. Translation can be regarded as the change of the position of the center of mass of the molecule in space, rotation can be regarded as the change of the orientation of the molecule in space, and vibration can be regarded as the change of the relative position of the atoms in the molecule when the center of mass and the orientation of the molecule remain unchanged. In the embodiment of the present application, the vibration degree of freedom of the piezoelectric body can be regarded as the change of relative positions of atoms in the molecule when the center of mass and spatial orientation of the molecules in the piezoelectric body remain unchanged.

Please refer to FIG. 8 and FIG. 9. FIG. 8 is a schematic structural view of the drive device 10 in another embodiment of the present application. FIG. 9 is a schematic cross-sectional structural view of the drive device 10 along the A-A direction in the embodiment of FIG. The pre-tensioning component 15 passes through the base 11 and supports the clamping member 14 for adjusting the force applied to the driver 13 .

Wherein, the base 11 is provided with an installation groove 112 communicating with the receiving groove 110 , and the clamping member 14 is installed in the installation groove 112 . The pre-tightening component 15 is passed through the base 11 and held against the holding member 14 , so as to cooperate with the sliding member 121 to adjust the force exerted on the holding member 132 . That is, the pretensioning assembly 15 is used to adjust the frictional force between the holding member 132 and the sliding member 121 , and the frictional force can make the support 12 move along the optical axis of the camera module 100 . It can be understood that the clamping piece 14 can be used as a push plate to push the piezoelectric body 131, and the frictional force between the holding piece 132 and the sliding piece 121 can be adjusted by adjusting the pressure applied by the pretensioning assembly 15 to the clamping piece 14 .

In one embodiment, the pre-tightening assembly 15 may include a pressure member 151 , the pressure member 151 passes through the installation groove 112 and abuts against the side of the clamping member 14 away from the piezoelectric body 131 , so that the pressure member 151 The pressure applied to the clamp 14 is adjusted. The base 11 is formed with a through hole 113 communicating with the installation groove 112 , and the pressing member 151 passes through the through hole 113 . Wherein, the pressure member 151 may be a structural member that is fitted with a nut and a bolt, that is, the bolt passes through the through hole 113 and is threadedly engaged with the nut, and the bolt is twisted to adjust the pressure applied to the clamping member 14 . Certainly, in some embodiments, the pressing member 151 may be a bolt or a screw, and the through hole 113 is provided with an internal thread, that is, the pressing member 151 cooperates with the through hole 113 to adjust the pressure applied to the clamping member 14 .

In one embodiment, the pre-tightening assembly 15 may further include an elastic member 152, which is arranged between the pressing member 151 and the clamping member 14, so as to adjust the pre-tightening force between the holding member and the sliding member. . Wherein, the elastic member 152 may be an elastic structural member such as a spring or foam.

In this embodiment, the force applied to the driver is adjusted by setting a pretensioning component, so as to avoid structural locking or no-load caused by mismatching contact force between the supporting member and the sliding member. That is to say, in this embodiment, the pre-tightening force between the holding member and the sliding member is adjusted by the pre-tightening assembly, so as to ensure the structural stability of the driving device and the smoothness of driving.

Please refer to Fig. 10, Fig. 10 is a schematic cross-sectional structure diagram of the driving device 10 in other embodiments of the present application, wherein the difference between the driving device 10 in this embodiment and the driving device 10 in the preceding embodiments lies in the structure of the pretensioning assembly 15 different.

In this embodiment, the pretensioning assembly 15 generally includes a first absorbing part 153 and a second absorbing part 154 that are correspondingly arranged. The pressure applied to the clamping part 14 is adjusted by magnetic force between the first adsorbing part 153 and the second adsorbing part 154 . Wherein, the first absorbing part 153 is disposed on the sidewall of the installation groove 112 , and the second absorbing part 154 is disposed on the clamping part 14 . For example, both the first absorbing part 153 and the second absorbing part 154 can be magnets, and the pressure applied to the clamping part 14 can be adjusted through magnetic repulsion. As another example, one of the first adsorption part 153 and the second adsorption part 154 is a magnet, and the other is an energized coil, and the pressure applied to the clamping part 14 can be adjusted by controlling the on-off and current of the energized coil, In order to realize automatic adjustment control.

In this embodiment, the force applied to the driver is adjusted by setting a pretensioning component, so as to avoid structural locking or no-load caused by mismatching contact force between the supporting member and the sliding member. That is to say, in this embodiment, the pre-tightening force between the holding member and the sliding member is adjusted by the pre-tightening assembly, so as to ensure the structural stability of the driving device and the smoothness of driving. In addition, the pressure applied to the clamping part is adjusted by setting the first absorbing part and the second absorbing part, so the structure is simple and the control is convenient.

Please refer to FIG. 11. FIG. 11 is a partial structural diagram of the driving device 10 in other embodiments of the present application, wherein the difference between the driving device 10 in this embodiment and the driving device 10 in the previous embodiments is that the driving device 10 may also include Buffer assembly 16.

The base 11 is formed with a buffer slot 114 communicating with the mounting slot 112 , and the buffer assembly 16 is accommodated in the buffer slot 114 . The opposite ends of the buffer assembly 16 are respectively connected to the inner wall of the clamping member 14 and the buffer groove 114, so as to ensure the stability of the camera module 100 even if there is a large vibration during use, and to a certain extent, the optical anti-shake function can be enhanced .

Wherein, the pretensioning assembly 15 abuts against the bottom wall 143 of the clamping member 14, and the buffer groove 114 is provided corresponding to the first side wall 141 or the second side wall 142 of the clamping member 14, that is, the buffering assembly 16 abuts against the clamping member 14. The first side wall 141 or the second side wall 142 of the component 14 .

In one embodiment, the buffer assembly 16 generally includes a buffer member 161 and a guide member 162 passing through the buffer member 161 . The extending direction of the guide piece 162 is substantially parallel to the optical axis of the camera module 100 , and opposite ends of the guide piece 162 are respectively connected to the clamping piece 14 and the inner wall of the buffer groove 114 . The buffer member 161 is sleeved on the guide member 162 and connected to the clamping member 14 and the inner wall of the buffer groove 114 respectively, so that the buffer member 161 can expand and contract under the guidance of the guide member 162 . Wherein, the buffer member 161 may be an elastic structural member such as a spring or foam.

In this embodiment, the anti-shake function of the camera module is realized by setting a buffer component.

In an embodiment, the bracket 12 is slidably connected to the base 11 , that is, the driving device 10 may further include a guide assembly 17 for guiding the movement of the bracket 12 . Please refer to FIG. 12 and FIG. 13 , FIG. 12 is a schematic top view of the driving device 10 in some embodiments of the present application, and FIG. 13 is a schematic cross-sectional structural diagram of the driving device 10 along the B-B direction in the embodiment of FIG. 12 .

The guide assembly 17 generally includes a plurality of balls 170 , an upper rolling groove 171 disposed on the base 11 , and a lower rolling groove 172 disposed on the bracket 12 . The upper rolling groove 171 and the lower rolling groove 172 cooperate to accommodate the ball 170 . The bracket 12 is kept in the relative position in the base 11 by the driver 13 and the ball 170 , and can move relative to the base 11 under the driving of the driver 13 and the guidance of the guide assembly 17 . It should be understood that "plurality" means at least two, such as two, three, etc., unless specifically defined otherwise. It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the drawing). If the specific posture changes, the directional indication will also change accordingly.

The plurality of balls 170 may at least include a first set of balls 1701 and a second set of balls 1702 . The upper rolling groove 171 may at least include a first upper rolling groove 1711 and a second upper rolling groove 1712 respectively corresponding to the first group of balls 1701 and the second group of balls 1702 . The lower rolling groove 172 may at least include a first lower rolling groove 1721 and a second lower rolling groove 1722 respectively corresponding to the first group of balls 1701 and the second group of balls 1702 . The first upper rolling groove 1711 and the first lower rolling groove 1721 cooperate to accommodate the first group of balls 1701 , and the second upper rolling groove 1712 and the second lower rolling groove 1722 cooperate to accommodate the second group of balls 1702 .

In one embodiment, the first group of balls 1701 may include an upper ball 1701a, a middle ball 1702b, and a lower ball 1701c stacked along the optical axis. Optionally, the diameter of the middle ball 1701b may be smaller than the diameters of the upper ball 1701a and the lower ball 1701c, and the diameters of the upper ball 1701a and the lower ball 1701c may be the same. Similarly, the second set of balls 1702 can also adopt the same setting as that of the first set of balls 1701, which will not be repeated here.

Wherein, the upper balls, the middle balls and the lower balls of the two groups of balls are respectively in rolling contact with the upper rolling groove and the lower rolling groove.

In the present application, the tilting of the lens can be prevented by arranging the guide assembly, and the deflection of the lens can be avoided by arranging a plurality of balls along the direction of the optical axis. In addition, by making the diameter of the middle balls of the multiple stacked balls smaller than the diameters of the upper balls and lower balls, the friction force during the movement of the bracket 12 can be reduced, so as to ensure the matching precision and smooth movement of the bracket, the guide assembly and the base sex.

In one embodiment, the balls in the first group of balls 1701 are in one-point contact or two-point contact with the first upper rolling groove 1711 , and the balls in the first group of balls 1701 are in a gap with the second lower rolling groove 1722 . In yet another embodiment, the balls in the first group of balls 1701 are disposed in a gap with the first upper rolling groove 1711 , and the balls in the first group of balls 1701 are in one-point contact or two-point contact with the second lower rolling groove 1722 . The balls in the second group of balls 1702 are in two-point contact with the second upper rolling groove 1712 , and the balls in the second group of balls 1702 are in two-point contact with the second lower rolling groove 1722 .

In the driving device in this implementation, the guide assembly guides the movement of the bracket, and the diameter of the middle ball of the stacked multiple balls is smaller than the diameter of the upper ball and the lower ball, which can reduce the friction during the movement of the bracket. Cooperate with the guide assembly and the base for precision and smooth motion; by setting the ball and a rolling groove at a gap, the reliability of the structure can be increased, and mismatching due to machining errors can be avoided during assembly. That is, the gap between the ball and the rolling groove on one side is used to ensure the normal operation and assembly of the mechanism in the event of processing errors.

It can be understood that, in some embodiments, the guide assembly can also adopt a sliding rail and a sliding block structure to realize the sliding connection between the bracket and the base. Of course, the sliding connection between the bracket and the base can also adopt other cooperation methods, which will not be repeated here.

The drive device provided in the embodiment of the present application realizes The fixing of the piezoelectric body does not affect the vibration mode of the piezoelectric body as much as possible, so that the vibration of the piezoelectric body can be converted to the movement of the top holder to the maximum extent, thereby increasing the driving force and supporting large-stroke driving. In addition, the driving device clamps the driver with the clamping part, and the overall structure is simple and compact, which is beneficial to realize the miniaturization requirement of the driving device. In addition, the piezoelectric body is driven by voltage to generate slight vibrations, which can immediately stop the driving device in the event of a power failure, realizing self-locking without noise. Among them, compared with the electromagnetic driving device, the driving device improved in this embodiment eliminates the risk of electromagnetic interference.

In some embodiments, in order to further control the moving stroke of the bracket or the lens, position sensors such as grating scales, scales, Hall sensors, etc. can be set in the driving device, so as to obtain the moving position of the bracket or the lens through the position sensor, and then Realize closed-loop control.

As mentioned above, a piezoelectric actuator refers to a device that uses the inverse piezoelectric effect (length expansion, thickness expansion, etc.) of piezoelectric materials (lead zirconate titanate, etc.) to convert electrical energy into mechanical energy or mechanical motion. In other words, the piezoelectric actuator uses the inverse piezoelectric effect of the piezoelectric material to excite the piezoelectric actuator's micro-vibration within a certain frequency, and through friction, the micro-vibration is converted into a macroscopic linear or rotational motion. That is, in the above-mentioned embodiment, the driver can excite the driver to vibrate slightly within a certain frequency by applying a voltage of a certain frequency, and through the friction between the driver and the moving body, the vibration of the driver can be converted into a macroscopic linear motion of the moving body .

The applicant found in the research that, after a voltage is applied to the piezoelectric body based on the first-order elongation (L1) vibration mode and the second-order bending vibration mode (B2) coupled working mode, after a certain frequency is applied, the drive and the moving body The contact surface can produce a motion similar to an elliptical trajectory, and then push the moving body to move in a straight line through friction. Among them, the piezoelectric body is the core component of the driver, which is mainly formed by a piezoelectric material block or film, so this determines the piezoelectric performance of the piezoelectric material (mainly the piezoelectric constant d33) and the performance of the driver (such as: drive Force, speed, driving voltage, etc.) are closely related. The d33 of commonly used piezoelectric materials is usually around 100-600pC/N, and the d33 of a small number of single crystal materials can reach 2000-4000pC/N. But despite this, the driving voltage of the general driver is hundreds of thousands of volts, so the main application scenario of the driver is usually in large piezoelectric body equipment, such as industrial robots, high-precision translation stages, etc.

In other words, current drivers using L1-B2 dual vibration mode coupling generally have disadvantages such as high driving voltage, complex structure, or difficult fabrication, and the piezoelectric body is generally made of piezoelectric ceramics, and the energy density is compared with that of piezoelectric single crystals. Low, it is not easy to achieve micro-nano level precision control, and it is not easy to realize miniaturization. Although the existing piezoelectric bodies made of piezoelectric single crystal materials are small in size and high in output performance, the required driving voltage is still relatively large (>100V).

In order to solve the above technical problems, the applicant proposes a driver and a driving device after research, which can effectively overcome the disadvantages of the driver such as complex structure, difficult manufacture, and high driving voltage, and can ensure performance output under the premise of miniaturization, which can be applied to camera modules. group drive.

Please refer to FIG. 14 and FIG. 15 , FIG. 14 is a schematic structural diagram of the driver 30 in some embodiments of the present application, and FIG. 15 is a schematic structural diagram of the piezoelectric body 31 in the embodiment of FIG. 14 .

The driver 30 generally includes a plurality of stacked piezoelectric bodies 31 and a supporting member 32 disposed at a specific position of the piezoelectric body 31 , that is, the supporting member 32 is disposed on a side of the piezoelectric body 31 not provided with driving electrodes. Wherein, the holding member 32 can be bonded to the center position or the axis-symmetrical position of the surface of the piezoelectric body 31 along the length direction or the width direction of the piezoelectric body 31 . When the piezoelectric body 31 moves, it can drive the top holder 32 to move, thereby relying on the top holder 32 and the moving body (the bracket/slider in the aforementioned embodiment, that is, the bracket/slider in the aforementioned embodiment can be reused as The frictional contact between the moving body in this embodiment drives the moving body to move. Wherein, the supporting member 32 can be the supporting member 132 in the above-mentioned embodiments, which will not be repeated here.

The piezoelectric body 31 is generally in the shape of a rectangular plate or a rectangular body, and can be made of materials such as piezoelectric ceramics, piezoelectric single crystals, and textured ceramics. Preferably, the piezoelectric body 31 can be made of lead indium niobate-lead magnesium niobate-lead titanate relaxor ferroelectric single crystal (PIN-PMN-PT single crystal). Of course, the piezoelectric body 31 can also be in other shapes, which will not be described in detail.

There can be one or more supporting pieces 32 . When there is one supporting member 32 , one supporting member 32 can be arranged at the center of the surface of the piezoelectric body 31 along the length direction or the width direction of the piezoelectric body 31 . When there are multiple supporting members 32 , the plurality of supporting members 32 may be arranged at axially symmetrical positions on the surface of the piezoelectric body 31 along the length direction or the width direction of the piezoelectric body 31 .

Wherein, FIG. 14 shows three directions of X, Y, and Z of the actuator 30 to facilitate the corresponding description below, wherein, the Z direction can be the thickness direction of the piezoelectric body 31, and the X and Y directions can be respectively the piezoelectric body 31. The electric body 31 is projected on the extension direction of two adjacent edges of the XY plane, or the X direction and the Y direction may be the length direction and the width direction of the piezoelectric body 31 respectively. It should be understood that, in some embodiments, the X direction may be the first direction, and the Y direction may be the second direction; in other embodiments, the X direction may be the second direction, and the Y direction may be the first direction.

In one embodiment, a plurality of piezoelectric bodies 31 are stacked along the Z direction and in a manner opposite to the direction indicated by the polarization direction of two adjacent piezoelectric bodies 31, and the polarization direction can be as shown in FIG. 15 P direction. It should be understood that the polarization directions of each piezoelectric body 31 are basically the same, and the polarization directions of two adjacent piezoelectric bodies 31 point to opposite directions when stacked.

The piezoelectric body 31 may include a first surface 311 and a second surface 312 oppositely disposed along the Z direction, the first surface 311 is provided with a first electrode layer 3101 , and the second surface 312 is provided with a second electrode layer 3102 . The supporting member 32 is disposed on the side of the plurality of piezoelectric bodies 31 , the side is disposed between the first surface 311 and the second surface 312 and connects the first surface 311 and the second surface 312 respectively. Wherein, the first electrode layer 3101 can be divided into a plurality of electrodes, and the second electrode layer 3102 can be an integrated electrode, that is, the electrodes of the second electrode layer 3102 have an integrated structure. In other words, the piezoelectric body 31 may include a first electrode layer 3101 and a second electrode layer 3102 oppositely arranged along the Z direction; where two adjacent piezoelectric bodies 31 pass through the first electrode layers on the two piezoelectric bodies 31 3101 for bonding, and/or, two adjacent piezoelectric bodies 31 are bonded through the second electrode layer 3102 on the two piezoelectric bodies 31 . For example, in one embodiment, the first surfaces 311 of two adjacent piezoelectric bodies 31 can be directly bonded through the first electrode layer 3101, and/or, the second surfaces 312 of two adjacent piezoelectric bodies 31 can be The second electrode layer 3102 is directly bonded, and this part of the implementation will be described in sequence below.

Wherein, the first electrode layer 3101 can be formed on the first surface 311 by screen printing conductive silver paste or conductive glue, and the second electrode layer 3102 can be formed on the second surface 312 by silk screen printing conductive silver paste or conductive glue. As shown in FIG. 14 , the driver 30 includes two piezoelectric bodies 31 stacked along the Z direction, and the second surfaces 312 of the two piezoelectric bodies 31 are directly connected by the second electrode layer 3102 formed by conductive silver paste or conductive glue. Adhesive connection. It can be understood that the conductive silver paste or conductive glue printed on the second surface 312 is not only used to form the second electrode layer 3102 to realize electrical functions, but also used as an adhesive medium between the two piezoelectric bodies 31 to realize Direct adhesive connection of two piezoelectric bodies 31 . In other words, the first electrode layer 3101 and the second electrode layer 3102 can be made of conductive silver paste or conductive glue, which can realize the bonding function under certain conditions (such as heat or pressure, which will be further described below).

Certainly, in other implementation manners, the first surfaces 311 of the two piezoelectric bodies 31 may be directly bonded and connected through the first electrode layer 3101 formed by conductive silver paste or conductive glue. That is, the conductive silver paste or conductive glue silk-screened on the first surface 311 is not only used to form the first electrode layer 3101 to realize electrical functions, but also used as an adhesive medium between two piezoelectric bodies 31 to realize two piezoelectric bodies 31. Adhesive connection of the body 31 .

Conductive adhesives generally combine conductive particles together through the bonding effect of the matrix resin to form a conductive path and realize the conductive connection of the adhered materials. Among them, the matrix resin is a kind of adhesive, and an appropriate curing temperature can be selected for bonding.

The main components of conductive silver paste are resin, solvent, additives, silver powder, etc. It has the characteristics of low curing temperature and high bonding strength, and can realize the conductive connection of the adhered materials.

In one embodiment, the first electrode layer 3101 is spaced apart from the edge of the first surface 311 extending along the X direction, and covers the edge of the first surface 311 extending along the Y direction. The second electrode layer 3102 is spaced apart from the edge of the second surface 312 extending along the Y direction, and covers the edge of the second surface 312 extending along the X direction. Wherein, the first electrode layer 3101 can be divided into first electrodes 3101 a and second electrodes 3101 b arranged at intervals along the X direction. The first electrode 3101a covers one edge of the first surface 311 extending along the Y direction, and the second electrode 3101b covers the other edge of the first surface 311 extending along the Y direction.

It can be understood that the first electrode layer 3101 may be spaced from one edge of the first surface 311 extending in the X direction, or the first electrode layer 3101 may be spaced apart from two opposite edges of the first surface 311 extending in the X direction. set up. The second electrode layer 3102 may be spaced apart from two opposite edges extending along the Y direction of the second surface 312 . The second electrode layer 3102 may cover one edge of the second surface 312 extending along the X direction, or the second electrode layer 3102 may cover two opposite edges of the second surface 312 extending along the X direction.

In this embodiment, by applying preset driving voltages to the first electrode 3101a and the second electrode 3101b respectively, the entire piezoelectric body 31 can be excited to generate the L1-B2 double vibration mode, so that the holding member 32 and the The contact surface of the moving body can generate a motion of an elliptical trajectory, and then through the friction between the supporting member 32 and the moving body, the moving body can be pushed to perform a macroscopic linear motion. Wherein, the first electrode 3101a and the second electrode 3101b can respectively apply a sine or cosine AC voltage with a phase difference of ±k(pi/2) (k is an integer), and the second electrode layer 3102 can be used as a ground terminal.

The driver 30 may further include a first external electrode 301 , a second external electrode 302 and a third external electrode 303 disposed on the sides of the plurality of piezoelectric bodies 31 . The first external electrode 301 is electrically connected to the first electrodes 3101 a on each piezoelectric body 31 , so that the first electrodes 3101 a on each piezoelectric body 31 are in a parallel structure on the circuit. The second external electrode 302 is electrically connected to the second electrodes 3101b on each piezoelectric body 31 , so that the second electrodes 3101b on each piezoelectric body 31 are in a parallel structure on the circuit. The third external electrode 303 is electrically connected to the second electrode layer 3102 on each piezoelectric body 31 , so that the second electrode layer 3102 on each piezoelectric body 31 is in a parallel structure on the circuit.

The first external electrode 301 at least partially covers one side of the piezoelectric body 31 substantially parallel to the YZ plane, so that the first external electrode 301 can be electrically connected to the first electrodes 3101a on the two piezoelectric bodies 31 respectively. The second external electrode 302 at least partially covers the other side of the piezoelectric body 31 substantially parallel to the YZ plane, so that the second external electrode 302 can be electrically connected to the second electrodes 3101b of the two piezoelectric bodies 31 respectively. The third external electrode 303 at least partially covers the side of the piezoelectric body 31 substantially parallel to the XZ plane, so that the third external electrode 303 can be electrically connected to the second electrode layers 3102 of the two piezoelectric bodies 31 respectively.

Wherein, the driver 30 in this embodiment can be applied to the driving device in the foregoing embodiments, and the technical features of the driver 30 that are not described in detail can refer to the drivers in the foregoing embodiments.

The driver provided in this embodiment is provided with a plurality of stacked piezoelectric bodies, and an external electrode is provided to electrically connect the corresponding electrodes of each piezoelectric body, so that the corresponding electrodes of each piezoelectric body form a parallel structure on the circuit, thereby making Driven by the same preset voltage, each piezoelectric body can generate L1-B2 dual vibration modes, and the entire driver can realize the corresponding motion state through the L1-B2 dual vibration modes of the multiple piezoelectric bodies. In addition, in this embodiment, the input power of the driver can be increased through the stacked structure of the multi-layer piezoelectric body, thereby obtaining greater driving force. In addition, the multilayer piezoelectric body stack structure can effectively reduce the driving voltage of the driver (<100V) when the total thickness of the driver remains unchanged. In this embodiment, the electrode layer is further formed by conductive glue or conductive silver paste to realize the electrical function, and the electrode layer is formed on the surface of the piezoelectric body and the two adjacent piezoelectric bodies are directly bonded through the electrode layer, which can reduce the driver's overall thickness. Wherein, the external electrodes can be connected to the circuit board of the electronic device, and a preset driving voltage can be applied to the piezoelectric body under the control of a driving circuit on the circuit board or a related control device such as a chip.

It can be understood that the driver provided in the embodiment of the present application is based on the coupling between the L1-B2 dual vibration modes to achieve a corresponding motion state. Of course, in other implementation manners, other vibration mode coupling methods may also be used to realize the elliptical motion track of the holding member.

Please refer to FIG. 16 and FIG. 17 , FIG. 16 is a schematic structural diagram of a driver 30 in some other embodiments of the present application, and FIG. 17 is a schematic structural diagram of a driver 30 in other embodiments of the present application. Wherein, the difference between the driver 30 in the embodiments of FIG. 16 and FIG. 17 and the driver 30 in the embodiment of FIG. 14 lies in that the number of stacked piezoelectric bodies 31 is different.

As shown in FIG. 16 , the driver 30 includes three stacked piezoelectric bodies 31 and a supporting member 32 arranged on the side of the three piezoelectric bodies 31 . As shown in FIG. 17 , the driver 30 includes four stacked piezoelectric bodies 31 and a supporting member 32 arranged on the side of the four piezoelectric bodies 31 . It can be understood that the number of piezoelectric bodies 31 can be other multiples, and the technical features of the piezoelectric bodies 31 and the holding member 32 can refer to the piezoelectric bodies and holding members in the foregoing embodiments.

Wherein, a plurality of piezoelectric bodies 31 are stacked along the Z direction in such a way that the polarization directions of two adjacent piezoelectric bodies 31 are opposite to each other, and the polarization direction can be the P direction as shown in the figure. It should be understood that the polarization direction of each piezoelectric body 31 itself is basically the same, that is, the polarization direction of each piezoelectric body 31 can be directed from the first surface to the second surface, or the polarization direction of each piezoelectric body 31 can be Pointing from the second surface to the first surface. When stacking, the polarization directions of two adjacent piezoelectric bodies 31 point to opposite directions, that is, when stacking, the first surfaces of two adjacent piezoelectric bodies 31 are close to each other, or two adjacent piezoelectric bodies 31 The second surfaces of are close to each other.

As shown in FIG. 16 , the three piezoelectric bodies are a first piezoelectric body 31 a , a second piezoelectric body 31 b , and a third piezoelectric body 31 c from top to bottom. The second surface of the first piezoelectric body 31a is in contact with the second surface of the second piezoelectric body 31b, and the first surface of the second piezoelectric body 31b is in contact with the first surface of the third piezoelectric body 31c. That is, the first piezoelectric body 31a and the second piezoelectric body 31b can be bonded and connected through the second electrode layer formed by conductive silver paste or conductive glue, and the second piezoelectric body 31b and the third piezoelectric body 31c can be connected by conductive silver paste. Paste or conductive glue formed the first electrode layer for adhesive connection.

As shown in FIG. 17 , the four piezoelectric bodies are a first piezoelectric body 31 a , a second piezoelectric body 31 b , a third piezoelectric body 31 c , and a fourth piezoelectric body 31 d from top to bottom. The second surface of the first piezoelectric body 31a is in contact with the second surface of the second piezoelectric body 31b, the first surface of the second piezoelectric body 31b is in contact with the first surface of the third piezoelectric body 31c, and the third piezoelectric body 31b is connected to the first surface of the third piezoelectric body 31c. The second surface of the piezoelectric body 31c is in contact with the second surface of the fourth piezoelectric body 31d. That is, the first piezoelectric body 31a and the second piezoelectric body 31b can be directly bonded and connected through the second electrode layer formed by conductive silver paste or conductive glue, and the second piezoelectric body 31b and the third piezoelectric body 31c can be connected by conductive The first electrode layer formed of silver paste or conductive glue is directly bonded and connected, and the third piezoelectric body 31c and the fourth piezoelectric body 31d can be directly bonded and connected through the second electrode layer formed of conductive silver paste or conductive glue.

The driver provided in this embodiment is provided with a plurality of stacked piezoelectric bodies, and an external electrode is provided to electrically connect the corresponding electrodes of each piezoelectric body, so that the corresponding electrodes of each piezoelectric body form a parallel structure on the circuit, thereby making Driven by the same preset voltage, each piezoelectric body can generate L1-B2 dual vibration modes, and the entire driver can realize the corresponding motion state through the L1-B2 dual vibration modes of the multiple piezoelectric bodies. In addition, in this embodiment, the input power of the driver can be increased through the stacked structure of the multi-layer piezoelectric body, thereby obtaining greater driving force. In addition, the multilayer piezoelectric body stack structure can effectively reduce the driving voltage of the driver (<100V) when the total thickness of the driver remains unchanged. This embodiment further uses conductive glue or conductive silver paste to form electrode layers to realize electrical functions, and realizes direct bonding connection between two piezoelectric bodies through conductive glue or conductive silver paste, which can reduce the overall thickness of the driver.

Please refer to FIG. 18 and FIG. 19 , FIG. 18 is a schematic structural diagram of a driver 40 in another embodiment of the present application, and FIG. 19 is a schematic structural diagram of a piezoelectric body 41 in the embodiment of FIG. 18 .

The driver 40 generally includes a plurality of stacked piezoelectric bodies 41 and a supporting member 42 disposed at a specific position of the piezoelectric body 41 , that is, the supporting member 42 is disposed on a side of the piezoelectric body 41 that is not provided with a driving electrode. Wherein, the holding member 42 can be bonded to the center position or the axis-symmetrical position of the surface of the piezoelectric body 41 along the length direction or the width direction of the piezoelectric body 41 . When the piezoelectric body 41 moves, it can drive the supporting member 42 to move, so that the moving body can be driven to move by relying on the frictional contact between the supporting member 42 and the moving body (the bracket/sliding member in the aforementioned embodiment). Wherein, the supporting member 42 can be the supporting member in the foregoing embodiments, and details are not described here.

In one embodiment, a plurality of piezoelectric bodies 41 are stacked along the Z direction and in a manner opposite to the direction indicated by the polarization direction of two adjacent piezoelectric bodies 41, and the polarization direction can be as shown in FIG. 17 P direction. It should be understood that the polarization directions of each piezoelectric body 41 are basically the same, and the polarization directions of two adjacent piezoelectric bodies 41 point to opposite directions when stacked.

The piezoelectric body 41 may include a first surface 411 and a second surface 412 oppositely disposed along the Z direction, the first surface 411 is provided with the first electrode layer 3101 , and the second surface 312 is provided with the second electrode layer 4102 . Wherein, the first electrode layer 4101 can be divided into a plurality of electrodes, and the second electrode layer 4102 can be an integrated electrode, that is, the electrodes of the second electrode layer 4102 have an integrated structure.

Wherein, the first electrode layer 4101 can be formed on the first surface 411 by screen printing conductive silver paste or conductive glue, and the second electrode layer 4102 can be formed on the second surface 412 by silk screen printing conductive silver paste or conductive glue. As shown in FIG. 16 , the actuator 30 includes two piezoelectric bodies 41 stacked along the Z direction, and the second surfaces 412 of the two piezoelectric bodies 41 are directly connected by the second electrode layer 4102 formed by conductive silver paste or conductive glue. Adhesive connection. It can be understood that the conductive silver paste or conductive glue printed on the second surface 412 is not only used to form the second electrode layer 4102 to achieve electrical functions, but also used as an adhesive medium between the two piezoelectric bodies 41 to achieve Direct adhesive connection of two piezoelectric bodies 41 .

In one embodiment, the first electrode layer 4101 is spaced apart from the edge of the first surface 411 extending along the Y direction, and covers the edge of the first surface 411 extending along the X direction. The second electrode layer 4102 is spaced apart from the edge of the second surface 412 extending along the X direction, and covers the edge of the second surface 412 extending along the Y direction. It can be understood that the first electrode layer 4101 can be spaced apart from one edge of the first surface 411 extending along the Y direction or two opposite edges can be spaced apart, and the first electrode layer 4101 can cover the first surface 411 along the X direction. Two oppositely disposed edges of the extension. The second electrode layer 4102 can be spaced apart from two opposite edges of the second surface 412 extending in the X direction, and the second electrode layer 4102 can cover one edge or two opposite edges of the second surface 412 extending in the Y direction. edge.

Wherein, the first electrode layer 4101 can be divided into a first electrode 4101a, a second electrode 4101b, a third electrode 4101c and a fourth electrode 4101d roughly arranged in an array.

The first electrode 4101a and the third electrode 4101c are arranged diagonally, and are divided into a group, ie, group A electrodes, and the same driving voltage can be applied thereto. The second electrode 4101b and the fourth electrode 4101d are arranged diagonally, and are divided into a group B group of electrodes, and the same driving voltage can be applied thereto.

In this embodiment, the piezoelectric body 41 can be excited to generate the L1-B2 dual vibration modes as a whole by applying preset driving voltages on the electrodes of the A group and the B group respectively, so that the holding member 42 and the moving body The contact surface of the contact surface can generate the movement of the elliptical trajectory, and then through the friction between the supporting member 42 and the moving body, the moving body can be pushed to perform macroscopic linear motion. Wherein, a sine or cosine AC voltage with a phase difference of ±k(pi/2) (k is an integer) can be applied to the electrodes of the group A and the electrodes of the group B respectively, and the second electrode layer 4102 can be used as a ground terminal.

The driver 40 may further include a first external electrode 401 , a second external electrode 402 , a third external electrode 403 , a fourth external electrode 404 and a fifth external electrode 405 disposed on the sides of the plurality of piezoelectric bodies 41 . The first external electrode 401 is electrically connected to the first electrodes 4101 a on each piezoelectric body 41 , so that the first electrodes 4101 a on each piezoelectric body 41 are in a parallel structure on the circuit. The second external electrode 402 is electrically connected to the second electrodes 4101b on each piezoelectric body 41 , so that the second electrodes 4101b on each piezoelectric body 41 are in a parallel structure on the circuit. The third external electrode 403 is electrically connected to the third electrodes 4101c on each piezoelectric body 41 , so that the third electrodes 4101c on each piezoelectric body 41 are in a parallel structure on the circuit. The fourth external electrode 404 is electrically connected to the fourth electrode 4101d on each piezoelectric body 41 , so that the fourth electrode 4101d on each piezoelectric body 41 is in a parallel structure on the circuit. The fifth external electrode 405 is electrically connected to the second electrode layer 4102 on each piezoelectric body 41 , so that the second electrode layer 4102 on each piezoelectric body 41 is in a parallel structure on the circuit.

In one embodiment, the first external electrode 401 at least partially covers one side of the piezoelectric body 41 that is substantially parallel to the XZ plane, so that the first external electrode 401 can be connected to the first electrodes 4101a on the two piezoelectric bodies 41 respectively. electrical connection. The second external electrode 402 at least partially covers the other side of the piezoelectric body 41 substantially parallel to the XZ plane, so that the second external electrode 402 can be electrically connected to the second electrodes 4101b of the two piezoelectric bodies 41 respectively. The third external electrode 403 and the second external electrode 402 are disposed on the same side of the piezoelectric body 41 , and can be electrically connected to the third electrodes 4101c on the two piezoelectric bodies 41 respectively. The fourth external electrode 404 is disposed on the same side of the piezoelectric body 41 as the first external electrode 401 , and can be electrically connected to the fourth electrodes 4101d on the two piezoelectric bodies 41 respectively. The fifth external electrode 405 at least partially covers the side surface of the piezoelectric body 41 substantially parallel to the YZ plane, so that the fifth external electrode 405 can be electrically connected to the second electrode layers 4102 of the two piezoelectric bodies 41 respectively.

Wherein, the driver 40 in this embodiment can be applied to the driving device in the foregoing embodiments, and the technical features of the driver 40 that are not described in detail can refer to the drivers in the foregoing embodiments.

Please refer to FIG. 20 and FIG. 21 , FIG. 20 is a schematic structural diagram of the driver 40 in some other embodiments of the present application, and FIG. 21 is a schematic structural diagram of the driver 40 in other embodiments of the present application.

As shown in FIG. 20 , the driver 40 includes three stacked piezoelectric bodies 41 and a supporting member 42 arranged on the side of the three piezoelectric bodies 31 . As shown in FIG. 21 , the driver 40 includes four piezoelectric bodies 41 stacked and a supporting member 42 arranged on the side of the four piezoelectric bodies 41 . It can be understood that the number of piezoelectric bodies 41 can be other multiples, and the technical features of the piezoelectric bodies 41 and the holding member 42 can refer to the piezoelectric bodies and holding members in the foregoing embodiments.

Wherein, a plurality of piezoelectric bodies 41 are stacked along the Z direction and in a manner that the polarization directions of two adjacent piezoelectric bodies 41 are opposite to each other, and the polarization direction may be the P direction as shown in the figure. It should be understood that the polarization direction of each piezoelectric body 41 itself is basically the same, that is, the polarization direction of each piezoelectric body 41 can be directed from the first surface to the second surface, or the polarization direction of each piezoelectric body 41 can be Pointing from the second surface to the first surface. When stacking, the polarization directions of two adjacent piezoelectric bodies 31 point to opposite directions, that is, when stacking, the first surfaces of two adjacent piezoelectric bodies 41 are close to each other, or two adjacent piezoelectric bodies 41 The second surfaces of are close to each other.

As shown in FIG. 20 , the three piezoelectric bodies are a first piezoelectric body 41 a , a second piezoelectric body 41 b , and a third piezoelectric body 41 c from top to bottom. The second surface of the first piezoelectric body 41a is in contact with the second surface of the second piezoelectric body 41b, and the first surface of the second piezoelectric body 41b is in contact with the first surface of the third piezoelectric body 41c. That is, the first piezoelectric body 41a and the second piezoelectric body 41b can be directly bonded and connected through the second electrode layer formed by conductive silver paste or conductive glue, and the second piezoelectric body 41b and the third piezoelectric body 41c can be connected by conductive The first electrode layer formed by silver paste or conductive glue is directly bonded and connected.

As shown in FIG. 21 , the four piezoelectric bodies are a first piezoelectric body 41 a , a second piezoelectric body 41 b , a third piezoelectric body 41 c , and a fourth piezoelectric body 41 d from top to bottom. The second surface of the first piezoelectric body 41a is in contact with the second surface of the second piezoelectric body 41b, and the first surface of the second piezoelectric body 41b is in contact with the first surface of the third piezoelectric body 41c. The second surface of the piezoelectric body 41c is in contact with the second surface of the fourth piezoelectric body 41d. That is, the first piezoelectric body 41a and the second piezoelectric body 41b can be directly bonded and connected through the second electrode layer formed by conductive silver paste or conductive glue, and the second piezoelectric body 41b and the third piezoelectric body 41c can be connected by conductive The first electrode layer formed by silver paste or conductive glue is directly bonded and connected, and the third piezoelectric body 41c and fourth piezoelectric body 41d can be directly bonded and connected by the second electrode layer formed by conductive silver paste or conductive glue.

The driver provided in this embodiment is provided with a plurality of stacked piezoelectric bodies, and an external electrode is provided to electrically connect the corresponding electrodes of each piezoelectric body, so that the corresponding electrodes of each piezoelectric body form a parallel structure on the circuit, thereby making Driven by the same preset voltage, each piezoelectric body can generate L1-B2 dual vibration modes, and the entire driver can realize the corresponding motion state through the L1-B2 dual vibration modes of the multiple piezoelectric bodies. In addition, in this embodiment, the input power of the driver can be increased through the stacked structure of the multi-layer piezoelectric body, thereby obtaining greater driving force. In addition, the multilayer piezoelectric body stack structure can effectively reduce the driving voltage of the driver (<100V) when the total thickness of the driver remains unchanged. This embodiment further uses conductive glue or conductive silver paste to form electrode layers to realize electrical functions, and realizes direct bonding connection between two piezoelectric bodies through conductive glue or conductive silver paste, which can reduce the overall thickness of the driver. That is, through the first electrode layer and the second electrode layer arranged oppositely, the piezoelectric body can realize the corresponding vibration mode, and at the same time, the two adjacent piezoelectric bodies are directly bonded through the first electrode layer and/or the second electrode layer. The main body can reduce the overall thickness of the driver to obtain greater driving force and realize large stroke driving.

It can be understood that, in the foregoing embodiments, the drivers formed by stacking 2, 3 and 4 piezoelectric bodies are illustrated respectively, and the first electrode layer can be divided into two electrodes and four electrodes, Those skilled in the art can directly obtain the driver formed by stacking 5, 6 or other multiple piezoelectric bodies as required, and the embodiment in which the first electrode layer can be divided into other multiple electrodes, which will not be repeated here.

Please refer to Figure 22 and Figure 23, Figure 22 is a schematic diagram of the X-direction displacement output of the driver in some embodiments of the present application when it is unloaded at a preset voltage, and Figure 23 is a schematic diagram of the driver in some embodiments of the present application when it is unloaded at a preset voltage The schematic diagram of the Y-direction displacement output at time. In this embodiment, the preset voltage is a sinusoidal voltage with a peak value of 10Vpp.

As shown in Figure 22, the X-A curve indicates that when the preset voltage is applied to the first electrode (such as the embodiment corresponding to Figure 14-Figure 17) or the electrode group A (such as the embodiment corresponding to Figure 18-Figure 21), the driver is empty Output displacement in the X direction at time. The X-B curve represents the X-direction output displacement of the driver at no load when a preset voltage is applied to the second electrode (such as the embodiment corresponding to Figure 14-Figure 17 ) or group B electrodes (such as the embodiment corresponding to Figure 18-Figure 21 ). .

As shown in Figure 23, the Y-A curve indicates that when the preset voltage is applied to the first electrode (such as the embodiment corresponding to Figure 14-Figure 17) or the electrode group A (such as the embodiment corresponding to Figure 18-Figure 21), the driver is empty The output displacement in the Y direction of time. The Y-B curve represents the output displacement in the Y direction when the driver is unloaded when a preset voltage is applied to the second electrode (such as the embodiment corresponding to Figure 14-Figure 17) or group B electrodes (such as the embodiment corresponding to Figure 18-Figure 21). .

It can be seen from FIG. 22 and FIG. 23 that the symmetry resonant frequency of the first electrode and the second electrode is almost the same, or the symmetry resonance frequency of the electrodes of the group A and the electrodes of the group B is almost the same.

It can be understood that, at the resonant frequency, through the coupling of the L1-B2 mode, a displacement component in the X direction and a displacement component in the Y direction are simultaneously produced on the holding member, because two groups of driving electrodes (the first electrode and the second electrode ; Or, the phase difference of the voltage on the electrodes of the A group and the B group electrodes), and the combined displacement is an inclined ellipse, and then the moving body is pushed to generate a macroscopic displacement through the friction between the holding member and the moving body. Wherein, referring to FIG. 22 and FIG. 23 , it can be known that the driver in this embodiment can realize the movement precision of the moving body at the nanometer level, thereby realizing a better focusing effect.

Based on this, an embodiment of the present application further provides a method for manufacturing a driver, and the driver may be the driver in the foregoing embodiments. Please refer to FIG. 24. FIG. 24 is a schematic flowchart of a manufacturing method of a driver in some embodiments of the present application. The manufacturing method roughly includes the following steps:

S2401. Obtain the simulation size of the piezoelectric body. Please refer to FIG. 25 . FIG. 25 is a schematic diagram of comparison between impedance spectrum simulation and test results of driver coupling frequency in some embodiments of the present application. Among them, the modal analysis of the driver is carried out through simulation, so that the L1-B2 mode is coupled, and the corresponding resonance frequency is found. Simultaneously, size optimization is performed to obtain the simulated size of the piezoelectric body.

It can be understood that the resonant frequency is obtained through simulation, so that the driving voltage is applied at the resonant frequency to excite the L1-B2 mode, so that the piezoelectric body vibrates slightly within a certain frequency.

It can be seen from Figure 25 that while the simulation size is obtained through size optimization of the piezoelectric body, the modes of the drivers L1 and B2 are successfully coupled.

S2402. Acquire multiple piezoelectric bodies according to the simulated dimensions of the piezoelectric bodies. Wherein, the polarization directions of each piezoelectric body are consistent. It can be understood that the piezoelectric sheet can be cut according to the simulated size of the piezoelectric body by mechanical cutting, so as to obtain multiple required piezoelectric bodies.

S2403, respectively forming a first electrode layer and a second electrode layer on the first surface and the second surface of each piezoelectric body. Wherein, the first electrode layer can be formed on the first surface of each piezoelectric body by silk screen printing, and the second electrode layer can be formed on the second surface.

It can be understood that, regarding the technical features of the first electrode layer and the second electrode layer, reference may be made to the descriptions in the foregoing embodiments, so details are not repeated here.

S2404. Stack the plurality of piezoelectric bodies sequentially along the Z direction in such a manner that the directions indicated by the polarization directions of two adjacent piezoelectric bodies are opposite.

Please refer to FIG. 26 and FIG. 27 . FIG. 26 is a schematic structural diagram of a stacking device 50 for stacking piezoelectric bodies in some embodiments of the present application, and FIG. 27 is a schematic exploded structural diagram of the stacking device 50 in the embodiment of FIG. 26 . The stacking device 50 generally includes a base 51 , a partition 52 , a cover 53 and a support 54 . Intersecting card slots 511 and stacking slots 512 are formed on the base 51 . The partition plate 52 is detachably installed in the clamping groove 511 and can move along the depth direction of the clamping groove 511 . Wherein, the partition plate 52 roughly includes a moving portion 521 and a stacking portion 522 that intersect. The moving part 521 passes through the card slot 511 , and the stacking part 522 can be accommodated in the stacking slot 512 .

The cover plate 53 covers the base 51 and defines a through hole 530 corresponding to the stacking slot 512 . The support member 54 generally includes a support plate 541 and a support shaft 542. The support plate 541 is disposed on the side of the cover plate 53 facing away from the base 51. The support shaft 542 penetrates the through hole 530 for abutting against the stacking portion 522, that is, the support shaft 542 The support plate 541 can move in the stacking slot 512 , and the support plate 541 can be used to limit the maximum displacement of the support shaft 542 in the stacking slot 512 .

In one embodiment, there may be multiple partitions 52 , and the multiple partitions 52 are sequentially arranged along the depth direction of the clip groove 511 . A plurality of piezoelectric bodies corresponding to one driver can be clamped between two adjacent partitions 52 . In the actual process of stacking piezoelectric bodies, multiple piezoelectric bodies of each driver are stacked in the stacking groove 512 and located between two adjacent partitions 52 according to the method of step S2404. After the stacking is completed, move the support shaft 542 makes the support shaft 542 abut against the uppermost partition 52 , and a certain pressure can be applied through the support plate 541 so that the multiple piezoelectric bodies can be better bonded. It can be understood that by stacking the piezoelectric bodies in the stacking groove 512 , the alignment accuracy of the piezoelectric bodies can be improved to avoid stacking misalignment.

The stacking device 50 can be made by 3D printing, injection molding or cutting.

It can be understood that, in this embodiment, the stacking device 50 stacks a plurality of piezoelectric bodies, which can improve stacking efficiency, stacking alignment accuracy, and stacking flatness.

S2405. Solidify the stacked piezoelectric bodies. Specifically, the plurality of piezoelectric bodies can be pressed and solidified by applying an external force to the support 54 or relying on the weight of the support 54 . Of course, for the electrode layer formed by conductive silver paste or conductive glue, it can be cured and bonded by applying pressure to the support member 54 and/or heating multiple piezoelectric bodies.

S2406. Form a plurality of external electrodes on the side surfaces of the plurality of piezoelectric bodies. Specifically, a plurality of external electrodes may be formed on the side surfaces of the plurality of piezoelectric bodies by means of silk screen printing, printing or spraying. It can be understood that for the arrangement of the external electrodes, reference may be made to the foregoing embodiments, and details are not repeated here.

S2407. Arranging holding members on the side surfaces of the plurality of piezoelectric bodies to form a driver. That is, the holding member can be bonded to the side surfaces of the plurality of piezoelectric bodies by an adhesive such as epoxy resin. Regarding the technical features of the holding member, reference may be made to the foregoing embodiments, and details are not repeated here.

The manufacturing method provided in this embodiment uses a stacking device to stack a plurality of piezoelectric bodies to form a driver, which can reduce the difficulty of making the driver, improve the manufacturing efficiency and stacking accuracy, and can also ensure the flatness of the stack.

Please refer to FIG. 28 . FIG. 28 is a schematic diagram of the relationship curve between the output speed of the driving device and the driving voltage in some embodiments of the present application. By adjusting the size of the pre-tightening force, the best contact state between the holding member and the moving body can be maintained. Under the above resonance frequency, the output speed of the driving device can be tested to have a roughly linear relationship with the driving voltage. When the peak value of the driving voltage is 60Vpp, the output speed of the driving device can exceed 20mm/s. Wherein, the specific features of the driving device refer to the foregoing embodiments.

The applicant has found through research that the driving performance of the driver can be greatly improved by reducing the thickness of the single-layer piezoelectric body, and the driving voltage of the driver can be greatly reduced on the premise that the driving performance remains unchanged. After verification, the driving voltage can be reduced to about 2.8V.

The driver and the driving device provided in this embodiment use the inverse pressure change effect of the piezoelectric material to obtain the coupling of the L1-B2 mode and the optimized size of the driver through simulation, and reduce the driving of the driver by stacking multiple piezoelectric bodies Voltage, so that the driver uses a lower driving voltage at the coupling frequency to convert the microscopic elliptical motion generated by the driver into the macroscopic linear motion of the moving body through friction.

It should be noted that the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes other steps or elements inherent in these processes, methods, products or arrangements.

The above descriptions are only part of the embodiments of the application, and are not intended to limit the scope of protection of the application. All equivalent devices or equivalent process transformations made by using the contents of the specification and drawings of the application, or directly or indirectly used in other related All technical fields are equally included in the patent protection scope of the present application.

Claims

A driver, characterized in that the driver includes a plurality of stacked piezoelectric bodies, and a holding member provided on one side of the piezoelectric body; each of the piezoelectric bodies includes a first electrode oppositely arranged layer and a second electrode layer;

Wherein, two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/or, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies. The electrode layer is bonded.
The driver according to claim 1, wherein the polarization direction of each piezoelectric body is the same; the polarization direction is a direction in which the first electrode layer points to the second electrode layer, or, The polarization direction is a direction in which the second electrode layer points to the first electrode layer.
The driver according to claim 2, characterized in that, in the stacking direction of the plurality of piezoelectric bodies, the directions of polarization of two adjacent piezoelectric bodies are opposite.
The driver according to claim 1, wherein the first electrode layer and the second electrode layer are made of conductive silver paste or conductive glue.
The driver according to claim 1, wherein each piezoelectric body includes a first surface and a second surface oppositely disposed, the first electrode layer is formed on the first surface, and the second An electrode layer is formed on the second surface; wherein,

The extending directions of two adjacent edges of the first surface or the second surface are respectively the first direction and the second direction, and the first electrode layer covers the edges extending along the second direction of the first surface, The second electrode layer covers the edge of the second surface extending along the first direction.
The driver according to claim 5, wherein the first electrode layer is divided into first electrodes and second electrodes arranged at intervals along the first direction, and the side surfaces of the plurality of piezoelectric bodies are provided with first An external electrode, a second external electrode and a third external electrode; the first electrode on each piezoelectric body is connected in parallel through the first external electrode, and the second electrode on each piezoelectric body is connected through the The second external electrodes are connected in parallel, and the second electrode layers on each piezoelectric body are connected in parallel through the third external electrodes.
The driver according to claim 6, wherein the first electrode layer is spaced apart from at least one of the two opposite edges extending along the first direction of the first surface; the second electrode layer Two opposite edges extending along the second direction with the second surface are arranged at intervals.
The driver according to claim 6, wherein the first electrode and the second electrode are respectively applied with a sine or cosine AC voltage with a phase difference of ±k(pi/2), wherein k is an integer.
The driver according to claim 5, wherein the first electrode layer is divided into a first electrode, a second electrode, a third electrode and a fourth electrode arranged in an array, and the first electrode and the The third electrode is arranged diagonally, and the second electrode and the fourth electrode are arranged diagonally; wherein, the driving voltage applied to the first electrode and the third electrode is the same, and the driving voltage applied to the first electrode is the same. The driving voltage on the second electrode is the same as that on the fourth electrode.
The driver according to claim 9, wherein the side surfaces of the plurality of piezoelectric bodies are provided with a first external electrode, a second external electrode, a third external electrode, a fourth external electrode and a fifth external electrode, each The first electrodes on one of the piezoelectric bodies are connected in parallel through the first external electrodes, the second electrodes on each of the piezoelectric bodies are connected in parallel through the second external electrodes, and each of the piezoelectric bodies The third electrode on the piezoelectric body is connected in parallel through the third external electrode, the fourth electrode on each piezoelectric body is connected in parallel through the fourth external electrode, and the second electrode layer on each piezoelectric body Parallel connection is realized through the fifth external electrode.
The driver according to claim 9, wherein the phase of the driving voltage applied to the first electrode and the third electrode and the driving voltage applied to the second electrode and the fourth electrode is The difference is ±k(pi/2), where k is an integer.
The actuator according to claim 5, wherein the supporting member is arranged at a central position or an axis-symmetrical position of the piezoelectric body along the first direction or the second direction of the piezoelectric body.
A method for manufacturing a driver, characterized in that the driver includes a plurality of piezoelectric bodies, and each piezoelectric body includes a first surface and a second surface oppositely arranged, and the manufacturing method includes:

obtaining the simulated size of the piezoelectric body, and obtaining a plurality of the piezoelectric bodies according to the simulated size;

forming a first electrode layer on the first surface of each piezoelectric body, and forming a second electrode layer on the second surface of each piezoelectric body;

Stacking a plurality of the piezoelectric bodies in such a way that the polarization directions of two adjacent piezoelectric bodies point to opposite directions;

curing the stacked plurality of said piezoelectric bodies;

Wherein, two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/or, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies. The electrode layer is bonded.
The manufacturing method according to claim 13, wherein the step of stacking a plurality of piezoelectric bodies comprises:

Provide a stacking device, the stacking device includes a base and a partition, a stacking groove is formed on the base, the partition includes a stacking part; the stacking part can be accommodated in the stacking groove, and can be moved along the stacking The groove moves in the depth direction;

A plurality of piezoelectric bodies of each driver are stacked in the stacking groove and located between two adjacent stacking parts.
A driving device, characterized in that the driving device comprises:

Sports body;

The driver includes a plurality of stacked piezoelectric bodies and a holding member provided on one side of the piezoelectric body, and the holding member abuts against the moving body to drive the moving body to move;

Wherein, each piezoelectric body includes a first electrode layer and a second electrode layer oppositely arranged; two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/ Alternatively, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies.
The driving device according to claim 15, characterized in that, the contact surface of the holding member and the moving body can generate an elliptical trajectory movement, so that the friction between the holding member and the moving body can The action pushes the moving body to perform macroscopic linear motion.
A camera module, characterized in that it comprises:

lens;

A driving device, the driving device includes a moving body and the driver, and the lens is connected to the moving body; the driver includes a plurality of stacked piezoelectric bodies and a support set on one side of the piezoelectric body a member, the holding member abuts against the moving body for driving the moving body to move;

Wherein, each piezoelectric body includes a first electrode layer and a second electrode layer oppositely arranged; two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/ Alternatively, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies.
The camera module according to claim 17, wherein the driving device further comprises a bracket for mounting the lens, and the bracket is multiplexed as the moving body.
An electronic device, characterized in that the electronic device includes a display screen, a housing, a circuit board and a camera module, the camera module is connected to the housing or the display screen; the housing and the The display screen cooperates to form an accommodating space, and the circuit board is arranged in the accommodating space and is electrically connected with the camera module and the display screen; the camera module includes a lens and a driving device, and the driving device includes The moving body and the driver, the lens is connected to the moving body; the driver includes a plurality of stacked piezoelectric bodies and a holding piece arranged on one side of the piezoelectric body, and the holding piece is against the connected to the moving body for driving the moving body to move;

Wherein, each piezoelectric body includes a first electrode layer and a second electrode layer oppositely arranged; two adjacent piezoelectric bodies are bonded through the first electrode layer on the two piezoelectric bodies, and/ Alternatively, two adjacent piezoelectric bodies are bonded through the second electrode layer on the two piezoelectric bodies.
The electronic device according to claim 19, wherein the driving device further comprises a bracket for mounting the lens and a base provided with an accommodation groove, and the bracket and the driver are accommodated in the accommodation placed in the groove, the driver is arranged between the bracket and the base;

Wherein, the support is reused as the moving body.