Piezoelectric motor, camera module and electronic device

Abstract

The application provides a piezoelectric motor, a camera module and an electronic device. The piezoelectric motor comprises an exciter and a resonator, the resonator comprises a main body part and a pushing part, the main body part comprises a first central axis, the main body part is distributed on both sides of the first central axis, and the exciter is fixed to the main body part; the pushing part is connected to the main body part and is distributed on both sides of the first central axis, the pushing part is asymmetric about the first central axis, and the pushing part is used for driving a driven part to move under the excitation of the exciter. The technical scheme of the application adopts a piezoelectric driving technology, solves the electromagnetic interference problem of a traditional motor, and the shooting quality of the camera module and the electronic device is better.

Description

[0001] This application claims priority to Chinese Patent Application No. 202011640952.1, filed with the Chinese Patent Office on December 31, 2020, entitled "Resonator, Piezoelectric Motor, Camera Module and Electronic Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of photography technology, and more particularly to a piezoelectric motor, camera module, and electronic device. Background Technology

[0003] Currently, the motors in camera modules of electronic devices (such as mobile phones) are mainly moving-coil motors. A moving-coil motor consists of a magnet and a coil. The coil is wound around the outer periphery of the lens. Under the magnetic field of the magnet, the energized coil generates electromagnetic force, thereby propelling the lens. However, because moving-coil motors are driven by magnetic force, they are sensitive to surrounding magnetic materials or magnetic fields, and are prone to magnetic interference, leading to poor image quality from the camera module. Summary of the Invention

[0004] Embodiments of this application provide a piezoelectric motor, a camera module, and an electronic device. The piezoelectric motor employs piezoelectric drive technology, solving the electromagnetic interference problem of traditional motors, and the camera module and electronic device offer superior image quality.

[0005] In a first aspect, this application provides a piezoelectric motor, including an exciter and a resonator. The resonator includes a main body and a driving part. The main body includes a first central shaft and is distributed on both sides of the first central shaft. The exciter is fixed to the main body. The driving part is connected to the main body and distributed on both sides of the first central shaft. The driving part has an asymmetrical structure about the first central shaft. The driving part is used to drive a driven member to move under the excitation of the exciter.

[0006] It should be noted that the main body can be symmetrical about the first central axis or asymmetrical about the first central axis. The technical solution of this application does not impose strict limitations on this.

[0007] It is understandable that when no current is applied to the vibrator (the current is zero or very small), the vibrator is in its initial state. When a positive current is applied to the vibrator, it extends and is in an elongated state. When a negative current is applied to the vibrator, it contracts and is in a shortened state. That is, the vibrator deforms according to the applied electrical signal, and when the electrical signal is an alternating signal, the piezoelectric material will undergo periodic expansion and contraction.

[0008] Therefore, when a current of a certain frequency is applied to the exciter, the exciter can generate elastic vibration, which is amplified to the resonator through resonance. This causes the part of the resonator in contact with the driven component to move along an elliptical trajectory and generate relative friction with the driven component, thereby realizing the driving function of the piezoelectric motor. Among them, the ellipse includes a special ellipse with equal major and minor radii, that is, a circle.

[0009] Specifically, the elastic vibration generated by the exciter can be amplified to the main body through resonance. Since the main body is connected to the driving part, the vibration can be transmitted to the driving part, enabling it to move along an elliptical trajectory, thereby driving the driven member to move relative to the driving part. The asymmetrical design of the driving part structure allows for more diverse and varied structural forms, and can be adjusted to suit the space available for the camera module using this piezoelectric motor, achieving efficient space utilization. Furthermore, it enables the resonator to possess two resonant modes with different excitation frequencies, thus allowing the driven member to undergo directional reciprocating translational motion.

[0010] In other words, the resonator can generate two resonant modes under the excitation of the exciter. That is, the driving part can generate two resonant modes under the excitation of the exciter, and the excitation frequencies of the two resonant modes are different, and the vibration patterns are opposite. Specifically, when the driving part is excited by alternating signals of different frequencies, these two resonant modes can drive the driven part to move in two opposite directions, thereby realizing the reciprocating translational motion of the driven part.

[0011] Therefore, on the one hand, because piezoelectric motors use piezoelectric drive instead of magnetic drive, there are no strongly magnetic components inside the piezoelectric motor. This minimizes the possibility of magnetic interference to devices placed around the piezoelectric motor, effectively solving the electromagnetic interference problem of traditional motors. This results in better image quality for camera modules and electronic devices using piezoelectric motors. On the other hand, resonators can achieve directional translation of the driven component using a relatively simple and easy-to-manufacture structure. Thus, when an optical structure is fixed on the driven component, it can drive the optical structure to achieve directional translation as well, resulting in better optical effects.

[0012] In one possible implementation, the pushing part includes a first sidewall and a second sidewall, the connection between the first sidewall and the second sidewall forming a contact foot for contacting and engaging with the follower, and the first sidewall and the second sidewall are arranged at an angle.

[0013] It should be understood that the first sidewall and the second sidewall can form the external structure of the pusher, and the first sidewall and the second sidewall are set at an angle, that is, the first sidewall and the second sidewall are not coplanar.

[0014] Therefore, the top profile of the push unit can be triangular, and the top of the push unit can be understood as the part of the push unit away from the main body. This design facilitates the miniaturization of the resonator as a whole and makes the overall rigidity of the push unit greater, the structure more stable, and has better resistance to interference from external environmental factors. At the same time, because the overall rigidity of the push unit is greater, and the push unit contacts and cooperates with the driven component with the fixed optical structure, the push unit can push heavier optical structures. That is, the push unit can move the optical structure periodically and continuously, and the driving force is stable. Therefore, the push unit can push optical structures with greater weight and stroke, making the structure of the camera module more diversified and easier to meet the shooting requirements with high requirements for optical structure.

[0015] The top profile of the pushing part being triangular can include a top profile of an oblique triangle, a top profile of an isosceles triangle, a top profile of a curved triangle, or a top profile of a rounded triangle. The embodiments of this application do not impose strict limitations on these cases.

[0016] In one possible implementation, the intersection line of the first sidewall and the second sidewall is offset relative to the first central axis, the length of the first sidewall is not equal to the length of the second sidewall, the length of the first sidewall is the dimension of the first sidewall along the extension direction, and the length of the second sidewall is the dimension of the second sidewall along the extension direction.

[0017] For example, the lengths of the first sidewall and the second sidewall are not equal. The length of the first sidewall is its dimension along the extending direction, and the length of the second sidewall is its dimension along the extending direction. Thus, the intersection line of the first and second sidewalls deviates from the first central axis, and the top profile of the pusher portion formed by the first and second sidewalls can present a slanted triangular shape. This helps to further ensure the asymmetrical shape of the pusher portion structure, improve the structural stability and rigidity of the pusher portion, and provide a stable driving force for the driven member.

[0018] In one possible implementation, the line of intersection of the first sidewall and the second sidewall intersects the first central axis;

[0019] The length of the first sidewall is equal to the length of the second sidewall, the length of the first sidewall is the dimension of the first sidewall along the extension direction, and the length of the second sidewall is the dimension of the second sidewall along the extension direction.

[0020] Therefore, the top profile of the pusher section formed by the first and second sidewalls can be an isosceles triangle. This arrangement can ensure the special asymmetrical shape of the pusher section structure while further ensuring the structural stability and rigidity of the pusher section, so as to provide a stable driving force for the driven member.

[0021] Alternatively, the lengths of the first sidewall and the second sidewall are not equal, where the length of the first sidewall is the dimension of the first sidewall along the extension direction, and the length of the second sidewall is the dimension of the second sidewall along the extension direction.

[0022] Therefore, the top outline of the push unit, which is formed by the first and second sidewalls, can present an oblique triangular shape. This setting can improve the structural rigidity and stability of the push unit while ensuring the special asymmetrical shape of the push unit structure.

[0023] In one possible implementation, a hollow area is formed between the pushing part and the main body. This arrangement allows the pushing part to have diverse structural deformation possibilities while still having the function of driving the driven member to move, which is beneficial to adapting to the multi-scenario application needs of piezoelectric motors.

[0024] Alternatively, the pushing part may be a solid, closed structure.

[0025] In one possible implementation, the pushing part includes a first connecting arm and a second connecting arm, which are respectively connected to two sides of the same side of the main body. The end of the first connecting arm away from the main body is connected to the end of the second connecting arm away from the main body. The surfaces of the first connecting arm and the second connecting arm away from the main body form the first sidewall and the second sidewall. The first connecting arm, the second connecting arm, and the pushing part surround and form the hollow area.

[0026] The dimensions of the cross-section of the first connecting arm gradually change along the extension direction and / or the dimensions of the cross-section of the second connecting arm gradually change along the extension direction.

[0027] Therefore, the first and second connecting arms can cooperate to form a pushing part with a hollowed-out area that can push the driven member. By changing the structural shape of the first and second connecting arms, a special asymmetrical shape of the pushing part about the first central axis can be achieved. The asymmetrical arrangement of the pushing part structure enables the resonator as a whole to have two resonant modes with different excitation frequencies. When these two resonant modes are excited by the corresponding frequencies, the driven member can move in two opposite directions, thereby enabling the driven member to exhibit directional reciprocating translational motion.

[0028] In one possible implementation, the pushing part includes a first connecting arm and a second connecting arm, which are respectively connected to two sides of the same side of the main body. The end of the first connecting arm away from the main body is connected to the end of the second connecting arm away from the main body. The surfaces of the first connecting arm and the second connecting arm away from the main body form the first sidewall and the second sidewall. The first connecting arm, the second connecting arm, and the pushing part surround and form the hollow area.

[0029] The dimensions of the cross-section of the first connecting arm are equal along the extension direction and / or the dimensions of the cross-section of the second connecting arm are equal along the extension direction.

[0030] Therefore, the first and second connecting arms can cooperate to form a pushing part with a hollowed-out area that can push the driven member. By changing the structural shape of the first and second connecting arms, a special asymmetrical shape of the pushing part about the first central axis can be achieved. The asymmetrical arrangement of the pushing part structure enables the resonator as a whole to have two resonant modes with different excitation frequencies. When these two resonant modes are excited by the corresponding frequencies, the driven member can move in two opposite directions, thereby enabling the driven member to exhibit directional reciprocating translational motion.

[0031] In one possible implementation, the contact form between the contact foot and the follower includes line contact or surface contact.

[0032] For example, when the contact between the contact foot and the follower is a line contact, the first sidewall and the second sidewall have an angular transition. Alternatively, the surface of the contact foot that contacts the follower is an arc surface. When the contact between the contact foot and the follower is a surface contact, the surface of the contact foot that contacts the follower can be a plane. It should be understood that the shape of the contact foot is not limited to the shape described above; any shape that can satisfy the requirement of forming a contact fit with the follower is acceptable, and this embodiment does not impose strict limitations on this.

[0033] Therefore, the pushing part can exert a certain pre-pressure on the driven part with a smaller contact area, which is beneficial to increase the rigidity of the pushing part and eliminate the displacement caused by the gap between the two.

[0034] In one possible implementation, the resonator further includes a fixing part connected to the main body, the fixing part and the pushing part being located on different sides of the main body, the fixing part being capable of fixing the resonator to an external structural component;

[0035] The number of fixing parts is two, and the two fixing parts are distributed on both sides of the first central axis; or,

[0036] The number of fixing parts is multiple, and the multiple fixing parts are distributed on both sides of the first central axis. The number of fixing parts distributed on one side of the first central axis is the same as the number of fixing parts distributed on the other side of the first central axis; or,

[0037] The number of fixing parts is multiple, and the multiple fixing parts are distributed on both sides of the first central axis. The number of fixing parts distributed on one side of the first central axis is different from the number of fixing parts distributed on the other side of the first central axis.

[0038] It should be noted that the inconsistent number of fixed parts on both sides of the first central axis can include both cases where the pushing part is symmetrical about the first central axis and cases where the pushing part is asymmetrical about the first central axis. In the case where the pushing part is symmetrical about the first central axis, the asymmetrical number of fixed parts on both sides of the first central axis can also achieve a special asymmetrical shape in the resonator structure. This asymmetrical arrangement of the resonator structure, on the one hand, allows for a richer and more varied structural form of the resonator, and can also be adjusted according to the space available for the camera module using this piezoelectric motor, achieving the goal of rational space utilization. On the other hand, it enables the resonator as a whole to possess two resonant modes with different excitation frequencies, thereby causing the driven member to perform directional reciprocating translational motion.

[0039] Therefore, the position of the resonator can be fixed through the connection between the fixed part and the external structural component. As a result, when the resonator vibrates, the position of the resonator as a whole will not shift because the fixed part is fixed. This helps to improve the stability and reliability of the resonator's normal operation and further ensures the motion accuracy of the driven component.

[0040] In one possible implementation, the main body further includes a second central axis, which is perpendicular to the first central axis;

[0041] The number of the pushing parts is one, and they are distributed on one side of the second central axis. By setting a pushing part and engaging it with the driven member, the pushing part can smoothly drive the driven member to move, thereby driving the optical structure fixed on the driven member to move together, so as to achieve focusing or zooming of the camera module.

[0042] Alternatively, there may be two driving units, symmetrically distributed on both sides of the second central axis. This arrangement simplifies the fabrication and manufacturing of the resonator and ensures synchronous and consistent driving actions of the two driving units, resulting in high precision control of the reciprocating motion of the driven component and guaranteeing good motion performance of the driven component during its movement.

[0043] In one possible implementation, the piezoelectric motor includes a stator and a follower. The stator includes a fixedly connected exciter and a resonator as described above. The resonator contacts and engages with the follower, and is used to drive the follower to move relative to the stator.

[0044] It is understandable that an exciter can generate excitation force as an excitation component, causing the excited object to acquire a certain form and magnitude of vibration. A resonator can generate vibration through the excitation of the exciter and apply a force to the driven component to drive its movement.

[0045] For example, the exciter is a piezoelectric element made of a piezoelectric material, which can be an inorganic piezoelectric element made of a piezoelectric material such as a piezoelectric crystal or piezoelectric ceramic, or a piezoelectric element supported by an organic piezoelectric material such as polyvinylidene fluoride. The resonator can be a metal substrate made of one or more metal materials, such as stainless steel or iron.

[0046] In one possible implementation, the vibration generated by the exciter in the powered state can be amplified by the main body and transmitted to the driving part, so that the driving part drives the driven member to move;

[0047] The number of vibrators is one, and one vibrator is fixed to one of the opposite sides of the main body; or...

[0048] The number of vibrators is two, and the two vibrators are fixed to opposite sides of the main body. The number of vibrators can be flexibly selected according to the actual situation, which is beneficial to adapting to the application needs of various scenarios.

[0049] In one possible implementation, the piezoelectric motor further includes a follower that contacts and engages with the actuating part, and is used to move relative to the actuating part under the actuation of the actuating part.

[0050] It is understandable that when no current is applied to the vibrator (the current is zero or very small), the vibrator is in its initial state. When a positive current is applied to the vibrator, it extends and is in an elongated state. When a negative current is applied to the vibrator, it contracts and is in a shortened state. That is, the vibrator deforms according to the applied electrical signal, and when the electrical signal is an alternating signal, the piezoelectric material will undergo periodic expansion and contraction.

[0051] Therefore, when a current of a certain frequency is applied to the exciter, the exciter can generate elastic vibration, which is amplified to the resonator through resonance. This causes the part of the resonator in contact with the driven component to move along an elliptical trajectory and generate relative friction with the driven component, thereby realizing the driving function of the piezoelectric motor. Among them, the ellipse includes a special ellipse with equal major and minor radii, that is, a circle.

[0052] In one possible implementation, the resonator is used to drive the follower to move in a first direction under the drive of the exciter at a first frequency;

[0053] The resonator is also used to drive the follower to move in a second direction, which is opposite to the first direction, under the drive of the exciter at the second frequency.

[0054] Here, the first direction and the second direction can be understood as the directions in which the driven member moves relative to the resonator, that is, the driven member can move in two opposite directions relative to the resonator. For example, the driven member moving in the first direction is moving to the left, and moving in the second direction is moving to the right. When piezoelectric motors are applied to camera modules, moving to the left and to the right can be understood as moving back and forth along a direction parallel to the optical axis of the camera module.

[0055] It is understandable that the resonator as a whole has two resonant modes with different excitation frequencies. When these two resonant modes are excited by the corresponding frequencies, the follower can move in two opposite directions, thereby enabling the follower to exhibit directional reciprocating translational motion.

[0056] For example, when an alternating signal with a frequency of 600 kHz is applied to the vibrator, the vibrator can push the follower to move to the right. When an alternating signal with a frequency of 700 kHz is applied to the vibrator, the vibrator can push the follower to move to the left.

[0057] In one possible implementation, the follower includes a contact portion and a mating portion bent and connected to the contact portion. The contact portion contacts the pushing portion and applies an elastic holding force to the pushing portion. The mating portion forms a gap with the stator and is used to fix and connect the optical structure so as to drive the optical structure to move.

[0058] Therefore, the contact portion provides guidance during the movement of the driven member, enabling it to translate under the push of the pushing portion. The mating portion is bent and connected to the contact portion, ensuring that only the part of the driven member that needs to contact the pushing portion abuts against it, while the part that needs to be fixed to the optical structure is kept away from the pushing portion. This facilitates the rational use of the driven member's spatial layout and avoids interference between the two parts due to functional differences. On one hand, it achieves the purpose of being pushed by the pushing portion; on the other hand, it can be fixed to the optical structure, thus driving the optical structure to move together during movement, achieving focusing or zooming of the camera module.

[0059] Secondly, this application provides a camera module, which includes a base, an optical structure and a piezoelectric motor as described above, wherein the resonator is fixed to the base and the optical structure is fixed to the follower so as to move relative to the base under the drive of the resonator.

[0060] Thirdly, this application provides an electronic device, which includes a housing and a camera module as described above, the camera module being housed within the housing. Attached Figure Description

[0061] Figure 1 This is a schematic diagram of the electronic device provided in the embodiments of this application;

[0062] Figure 2 This is a simplified schematic diagram of the camera module provided in the embodiments of this application;

[0063] Figure 3 This is a schematic diagram of a piezoelectric motor provided in an embodiment of this application;

[0064] Figure 4 This is another structural schematic diagram of the piezoelectric motor provided in the embodiments of this application;

[0065] Figure 5 This is a schematic diagram of the stator structure of a piezoelectric motor provided in an embodiment of this application;

[0066] Figure 6 This is another structural schematic diagram of the stator of the piezoelectric motor provided in the embodiments of this application;

[0067] Figure 7 This is another structural schematic diagram of the stator of the piezoelectric motor provided in the embodiments of this application;

[0068] Figure 8 This is a schematic diagram of the inverse piezoelectric effect of the exciter of the piezoelectric motor provided in the embodiments of this application;

[0069] Figure 9 This is a schematic diagram of the structure of the vibrator of the piezoelectric motor provided in the embodiments of this application;

[0070] Figure 10 This is a schematic diagram of the drive circuit of the piezoelectric motor provided in the embodiments of this application;

[0071] Figure 11 This is a schematic diagram of the resonator provided in the first embodiment of this application;

[0072] Figure 12 This is a schematic diagram of a resonator structure according to a second embodiment of the resonator's driving section provided in the first embodiment of this application;

[0073] Figure 13This is a schematic diagram of a resonator structure according to Scheme 1 of the driving section of the resonator provided in the first embodiment of this application;

[0074] Figure 14 This is a schematic diagram of another structure of the resonator according to Scheme 1 of the driving section of the resonator provided in the first embodiment of this application;

[0075] Figure 15 This is another schematic diagram of the resonator structure of Scheme 1 of the driving section of the resonator provided in the first embodiment of this application;

[0076] Figure 16 This is a schematic diagram of another structure of the resonator of Scheme 1 of the driving section of the resonator provided in the first embodiment of this application;

[0077] Figure 17 This is a schematic diagram of a resonator structure of Scheme 3 of the driving section of the resonator provided in the first embodiment of this application;

[0078] Figure 18 This is a schematic diagram of a resonator structure according to Scheme 4 of the driving section of the resonator provided in the first embodiment of this application;

[0079] Figure 19 This is a schematic diagram of the structure of the driving part of the resonator provided in the second embodiment of this application;

[0080] Figure 20 This is a schematic diagram of another structure of the driving part of the resonator provided in the second embodiment of this application;

[0081] Figure 21 This is another schematic diagram of the driving section of the resonator provided in the second embodiment of this application;

[0082] Figure 22 This is a partial structural schematic diagram of the driving section of the resonator provided in an embodiment of this application;

[0083] Figure 23 This is a schematic diagram of the trajectory of the driving part of the resonator provided in the first embodiment of this application;

[0084] Figure 24 This is a schematic diagram of the trajectory of the driving part of the resonator provided in the second embodiment of this application. Detailed Implementation

[0085] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0086] And / or: This is simply a way of describing the relationship between related objects, indicating that there can be three kinds of relationships. For example, a and / or b can represent three cases: a exists alone, a and b exist simultaneously, and b exists alone.

[0087] Multiple: refers to two or more.

[0088] "Fixed" should be interpreted broadly. For example, "a is fixed to b" can mean that a and b are directly connected and their relative positions do not change after the connection, or it can mean that a and b are indirectly connected through an intermediate medium and their relative positions do not change after the connection.

[0089] The specific embodiments of this application will now be clearly described in conjunction with the accompanying drawings.

[0090] The embodiments of this application provide an electronic device, which may be, but is not limited to, a mobile phone, tablet computer, e-reader, laptop computer, in-vehicle device, wearable device, or wireless microwave receiving device.

[0091] For ease of understanding, we will use mobile phones, an electronic device with a wide user base and diverse application scenarios, as an example. However, it should be understood that this is not the only way to explain this.

[0092] Please see Figure 1 The electronic device 1000 includes a housing 1100 and a camera module 300 mounted on the housing 1100. The housing 1100 can accommodate the components of the electronic device 1000 and provide them with protection, effectively preventing damage to the components of the electronic device 1000 due to external mechanical damage. The camera module 300 is entirely housed inside the housing 1100, or most of the camera module 300 is housed inside the housing 1100. The camera module 300 enables the electronic device 1000 to achieve one or more of the following: real-time image acquisition, instant video call, or acquisition of three-dimensional information of the object under test. It can function as a front-facing camera to capture static images or dynamic videos in front of the electronic device 1000, or as a rear-facing camera to capture static images or dynamic videos behind the electronic device 1000.

[0093] Understandably, the camera module 300 can have focusing and zoom functions. Focusing can be understood as adjusting the distance between the imaging plane and the lens to ensure that the object is clearly imaged on the sensor, resulting in a sharp image of the subject. Zooming can be understood as changing the angle of view or image size through the combination and variation of multiple lens groups, thereby achieving a zoom-in or zoom-out effect. Generally speaking, the longer the focal length, the narrower the angle of view, the less scenery can be included in the frame, and the closer the image appears. The shorter the focal length, the wider the angle of view, the more scenery can be included in the frame, and the farther away the image appears.

[0094] It should be noted that, Figure 1The purpose of this illustration is solely to depict the connection relationship between the housing 1100 and the camera module 300, and it is not intended to specifically limit the connection positions, specific structures, or quantities of the various devices. Furthermore, the structures illustrated in this application's embodiments do not constitute a specific limitation on the electronic device 1000. In other embodiments of this application, the electronic device 1000 may include more or fewer components than illustrated, or combine certain components, or split certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of both.

[0095] Please see Figure 2 The camera module 300 may include a base 310, an optical structure 320, a circuit board 330, and a piezoelectric motor 200. The base 310 can be understood as a support component capable of housing various parts that make up the camera module 300 and directly or indirectly supporting these parts. The optical structure 320 can be understood as a structural component capable of enabling the camera module 300 to focus or zoom; it can be a single optical component, such as an optical lens, or an integrated or assembled structure formed by assembling multiple optical components, such as a lens group (also called a lens assembly) or a lens. The circuit board 330 can be electrically connected to the piezoelectric motor 200 to provide electrical signals to the piezoelectric motor 200, and can also be communicatively connected to the processor of the electronic device 1000. It can be arranged in a corresponding position within the camera module 300 as needed, such as on the inner wall of the base 310. The piezoelectric motor 200 can be understood as an actuating component that uses piezoelectric drive technology to drive the optical structure 320, thereby providing actuating force to cause directional translational motion, thus achieving better shooting results. For example, the piezoelectric motor 200 can be an ultrasonic piezoelectric motor (USM) with a resonant frequency of 20kHz or higher.

[0096] Among them, piezoelectric drive technology is based on the inverse piezoelectric effect of piezoelectric materials. By controlling the electrical signal applied to the piezoelectric material, the piezoelectric material is made to undergo mechanical deformation, which in turn drives the movement of other components of the piezoelectric motor 200, thereby driving the movement of the optical structure 320. The inverse piezoelectric effect refers to the mechanical deformation or mechanical stress generated in a certain direction when an electric field is applied in the polarization direction of the dielectric. When the applied electric field is removed, these deformations or stresses also disappear.

[0097] It should be noted that, Figure 2 This description is merely illustrative of the connection relationships between the base 310, optical structure 320, circuit board 330, and piezoelectric motor 200, and does not constitute a specific limitation on the connection positions, specific structures, or quantities of each device. Furthermore, the structures illustrated in this embodiment do not constitute a specific limitation on the camera module 300.

[0098] For example, when the optical structure 320 is a lens group, the optical structure 320 and the piezoelectric motor 200 can be connected one-to-one, so that when there are multiple optical structures 320, there can also be multiple piezoelectric motors 200. Multiple optical structures 320 can achieve relative movement under the drive of multiple piezoelectric motors 200, which can be understood as moving closer to or further away from each other. Therefore, according to the needs of the application scenario, the focal length and image can be adjusted by adjusting the relative positions between multiple optical structures 320 to obtain high-quality imaging results.

[0099] Based on the above description, since the piezoelectric motor 200 uses piezoelectric drive instead of magnetic drive, there are no strongly magnetic components inside the piezoelectric motor 200. On the one hand, this minimizes the possibility of magnetic interference to devices located around the piezoelectric motor 200, effectively solving the electromagnetic interference problem of traditional motors. On the other hand, due to its advantages such as low power consumption, simple structure, high position resolution, fast response, power-off self-locking, and low noise, it enables the camera module 300 and the electronic device 1000 using the camera module 300 to capture better images.

[0100] The following will combine Figures 2-10 The specific structure and driving principle of the piezoelectric motor 200 are described in full and in detail.

[0101] Please refer to the following: Figure 3 and Figure 4 The piezoelectric motor 200 includes a stator 210 and a follower 230. The stator 210 can be understood as the fixed-position part of the piezoelectric motor 200, which vibrates upon the application of an electrical signal, driving the follower 230 to move. The follower 230 can be understood as the part of the piezoelectric motor 200 whose position can change, achieving translational movement under the drive of the follower 230. In other words, the piezoelectric motor 200 is a transmission device capable of converting the inherent vibration (resonance) generated by the stator 210 into translational motion of the follower 230.

[0102] In one possible implementation, the stator 210 is fixed to the base 310, and the optical structure 320 is fixed to the follower 230. The follower 230 can drive the optical structure 320 to move relative to the base 310 under the drive of the stator 210. Thus, the optical structure 320 can also achieve directional translational movement through the directional translational movement of the follower 230, thereby realizing the focusing or zooming of the camera module 300.

[0103] Please refer to the following: Figure 5 , Figure 6 and Figure 7The stator 210 includes a vibrator 220 and a resonator 100 fixedly connected. The vibrator 220 can generate excitation force as an excitation component, so that the excited object obtains a vibration of a certain form and magnitude. The resonator 100 can generate vibration through the excitation of the vibrator 220 and apply a force to the driven member 230 to drive the driven member 230 to move.

[0104] For example, the exciter 220 is a piezoelectric element made of a piezoelectric material, which may be a piezoelectric element made of inorganic piezoelectric materials such as piezoelectric crystals or piezoelectric ceramics, or it may be a piezoelectric element supported by organic piezoelectric materials such as polyvinylidene fluoride. The resonator 100 may be a metal substrate made of one or more metal materials, such as stainless steel or iron.

[0105] Please see Figure 8 When no current is applied to the vibrator 220 (the current is zero or very small), the vibrator 220 is in its initial state. When a positive current is applied to the vibrator 220, the vibrator 220 extends and is in an elongated state. When a negative current is applied to the vibrator 220, the vibrator 220 contracts and is in a shortened state. That is, the vibrator 220 deforms according to the applied electrical signal. When the electrical signal is an alternating signal, the piezoelectric material will undergo periodic expansion and contraction.

[0106] Therefore, when a current of a certain frequency is applied to the vibrator 220, the vibrator 220 can generate elastic vibration, which is amplified to the resonator 100 through resonance. This causes the part of the resonator 100 that contacts the follower 230 to form an elliptical trajectory and to generate relative friction with the follower 230, thereby realizing the driving function of the piezoelectric motor 200.

[0107] Please refer to the following: Figure 5 and Figure 9 The exciter 220 includes a front surface 2201 and a back surface 2202. The front surface 2201 of the exciter 220 can be understood as the surface of the exciter 220 away from the resonator 100, and the back surface 2202 of the exciter 220 can be understood as the surface of the exciter 220 in contact with the resonator 100. The front surface 2201 of the exciter 220 can be electrically connected to the circuit board 330 so that the circuit board 330 can send a drive signal to drive the exciter 220. The back surface 2202 of the exciter 220 is fixed to the resonator 100 so that the exciter 220 is fixedly connected to the resonator 100. Exemplarily, the back surface 2202 of the exciter 220 can be connected to the resonator 100 by conductive adhesive.

[0108] Therefore, the resonator 100 provides strong support for the exciter 220, meaning that the exciter 220's fixation stability is enhanced through its connection with the resonator 100. On one hand, this meets the reliability requirements of the exciter 220 drop test, effectively enhancing its resistance to accidental impacts. On the other hand, it minimizes the possibility of damage to the exciter 220 due to drops during actual applications, ensuring strong connection reliability.

[0109] Both the front side 2201 and the back side 2202 of the exciter 220 can be plated with conductive material to enable the exciter 220 to be used with external electrodes. Specifically, the resonator 100 can be grounded, and the exciter 220 is fixedly connected to the resonator 100. Therefore, the front side 2201 of the exciter 220 can be connected to the positive terminal, and the back side 2202 of the exciter 220 can be grounded. Thus, the piezoelectric motor 200 as a whole can be formed as shown in the figure. Figure 10 The connection circuit is shown. Of course, the resonator 100 can also be connected to the positive terminal, so that the front side 2201 of the exciter 220 can be grounded and the back side 2202 of the exciter 220 can be connected to the positive terminal. The embodiments of this application do not strictly limit this.

[0110] Exemplarily, the exciter 220 may be rectangular, circular, or polygonal. The conductive material may be a material such as gold or silver. The embodiments of this application do not impose strict limitations on the shape of the exciter 220 or the conductive material plated on the surface of the exciter 220.

[0111] In one possible implementation, the piezoelectric motor 200 further includes a drive circuit. The drive circuit can be formed on the circuit board 330 or fixedly and electrically connected to the circuit board 330. When the drive circuit is formed on the circuit board 330, it can include traces on the circuit board 330 and one or more components fixed to the circuit board 330. These components can be, but are not limited to, resistors, capacitors, and inductors. When the drive circuit is fixedly and electrically connected to the circuit board 330, the drive circuit can be embodied as a chip structure or a circuit assembly including the circuit board 330 and components. Of course, the drive circuit can also be integrated into the processor of the electronic device 1000.

[0112] It is understood that the drive circuit can generate a drive signal to drive the exciter 220 and ground the resonator 100. Exemplarily, the exciter 220 can be electrically connected to the drive circuit via a conductor to form a link capable of transmitting a drive signal to the exciter 220, and the resonator 100 can be electrically connected to the drive circuit via another conductor to form a link capable of grounding the resonator 100.

[0113] In one possible implementation, the number of exciters 220 can be one, and the exciter 220 can be fixed to either side of the resonator 100 that are opposite to each other. That is, the exciter 220 is set on one side only. The exciter 220 set on one side can excite the resonator 100 to resonate.

[0114] In another possible implementation, there can be two exciters 220, which are fixed to opposite sides of the resonator 100. That is, the exciters 220 are arranged on both sides. The dual-sided arrangement of the exciters 220 provides good stability, further ensuring that the exciters 220 can effectively excite the resonator 100 to resonate, resulting in high reliability.

[0115] It should be noted that when there are two exciters 220, both exciters 220 must be excited by an electrical signal of the same frequency to ensure that the resonator 100 can resonate stably. Alternatively, there can be multiple exciters 220. Multiple exciters 220 can be arranged in the same number on both sides of the resonator 100, or multiple exciters 220 can be arranged in different numbers on both sides of the resonator 100, as long as they are excited by an alternating signal of the same frequency. The embodiments of this application do not impose strict limitations on the number of exciters 220.

[0116] Based on the above description, it should be understood that the exciter 220 can generate periodic mechanical deformation after being excited by an alternating signal of a certain frequency, so that the resonator 100 connected to the exciter 220 can resonate, thereby forming a special vibration mode between the exciter 220 and the resonator 100, so that the resonator 100 can drive the driven member 230 to move.

[0117] The structure of the exciter 220 has been described in detail above. The following will combine... Figures 11-21 The structure of resonator 100 is described in detail.

[0118] Please refer to the following: Figure 11 and Figure 12 The resonator 100 includes a main body 10, a fixing part 20, and a pushing part 30. The main body 10 is the portion of the resonator 100 that provides a large contact area to fix the exciter 220. The fixing part 20 is the portion of the resonator 100 that can be fixed to an external structural member to fix the position of the resonator 100. The pushing part 30 is the portion of the resonator 100 that can contact and engage with the driven member 230 to drive the driven member 230 to move.

[0119] The main body 10 includes a first surface 101 and a second surface 102 arranged opposite to each other. The first surface 101 can be fixed to the vibrator 220, and the second surface 102 can also be fixed to the vibrator 220. Therefore, when there are two or more vibrators 220, the vibrators 220 can be arranged on the first surface 101 and the second surface 102 of the main body 10, which is beneficial to improving the stability of the overall structure of the piezoelectric motor 200.

[0120] It is understandable that the main body 10 is in contact with the exciter 220, meaning the main body 10 can directly contact the exciter 220. Therefore, when the exciter 220 is excited by an alternating signal of a certain frequency, it can generate periodic mechanical deformation, also known as periodic elastic vibration. This vibration can be amplified to the main body 10 through resonance, that is, to the resonator 100, causing the resonator 100 to drive the driven member 230 to move. Here, "certain frequency" can be understood as the frequency at which the resonator 100 can resonate.

[0121] In the embodiments of this application, the main body 10 has a first central axis A and a second central axis B, the first central axis A and the second central axis B are perpendicular to each other, and the intersection of the first central axis A and the second central axis B is located on the center line of the main body 10.

[0122] It is understood that, from the perspective of the first central axis A, the main body 10 is distributed on both sides of the first central axis A. The main body 10 can be symmetrical about the first central axis A, or it can be asymmetrical about the first central axis A (for example, having irregular edges in the main body). From the perspective of the second central axis B, the main body 10 is distributed on both sides of the second central axis B. It should be understood that the main body 10 can also be symmetrical about the second central axis B, that is, the main body 10 can be symmetrical about both the first central axis A and the second central axis B. The embodiments of this application do not impose strict limitations on this. For example, the main body 10 can be rectangular.

[0123] Please refer to the following: Figures 12-21 The fixing part 20 is connected to the main body 10, and the fixing part 20 can fix the resonator 100 to the external structural component. That is, the fixing part 20 can fix the stator 210 to the external structural component. When the piezoelectric motor 200 is applied to the camera module 300, the external structural component can be the side wall of the base 310 of the camera module 300, or it can be other stationary components inside the camera module 300. The embodiments of this application do not impose strict limitations on this.

[0124] Thus, the position of the fixing part 20 is fixed, that is, the position of the resonator 100 can be fixed through the connection between the fixing part 20 and the external structural component. Therefore, when the resonator 100 vibrates, the overall position of the resonator 100 will not shift because the fixing part 20 is fixed. This is beneficial to improving the stability and reliability of the normal operation of the resonator 100 and further ensuring the motion accuracy of the follower 230.

[0125] It is understood that the number of fixing parts 20 may be at least two, and at least two fixing parts 20 are distributed on both sides of the first central axis A and connected to the main body part 10.

[0126] For example, the number of fixing parts 20 may be two, with the two fixing parts 20 distributed on both sides of the first central axis A. Alternatively, the number of fixing parts 20 may be three, with one fixing part 20 distributed on one side of the first central axis A and the remaining two fixing parts 20 distributed on the other side of the second central axis B and spaced apart. Alternatively, the number of fixing parts 20 may be multiple, with multiple fixing parts 20 distributed on both sides of the first central axis A, and the number of fixing parts 20 distributed on one side of the first central axis A being the same as the number of fixing parts 20 distributed on the other side of the first central axis A. Alternatively, the number of fixing parts 20 may be multiple, with multiple fixing parts 20 distributed on both sides of the first central axis A, and the number of fixing parts 20 distributed on one side of the first central axis A being different from the number of fixing parts 20 distributed on the other side of the first central axis A.

[0127] It should be noted that the shape of the fixing part 20 can be rectangular, arc-shaped, polygonal, etc. The connection position of the fixing part 20 can be the middle position of one side of the main body 10, or the two ends of one side of the main body 10. The fixing part 20 can be spaced apart from the pushing part 30, or connected to the pushing part 30, as long as it can play a fixing role and is distributed on different sides of the main body 10 with the pushing part 30. In this embodiment, there are no strict restrictions on the number, shape and connection position of the fixing part 20.

[0128] The pusher 30 is connected to the main body 10 and distributed on both sides of the first central axis A. The pusher 30 and the fixed part 20 are located on different sides of the main body 10, and the pusher 30 is in contact with the driven member 230. It should be understood that since the pusher 30 and the fixed part 20 have functional differences, arranging the pusher 30 and the fixed part 20 on different sides of the main body 10 allows them to be arranged in different areas of the main body 10 according to their different functions, minimizing the possibility of interference between the two causing a decrease in the effect of the piezoelectric motor 200.

[0129] Please see Figure 5In one possible implementation, the number of pushing parts 30 is one, and it is distributed on one side of the second central axis B. In other words, from the perspective of the first central axis A, the pushing parts 30 are distributed on both sides of the first central axis A, while from the perspective of the second central axis B, one pushing part 30 is distributed on one side of the second central axis B, that is, one pushing part 30 is connected to either side of the opposite sides of the main body 10. By providing one pushing part 30 and having the pushing part 30 contact and cooperate with the driven member 230, the pushing part 30 can smoothly drive the driven member 230 to move, thereby driving the optical structure 320 fixed on the driven member 230 to move together, so as to realize the focusing or zooming of the camera module 300.

[0130] Please see Figure 6 In another possible implementation, there are two pushing parts 30, symmetrically distributed on both sides of the second central axis B. In other words, from the perspective of the first central axis A, each of the two pushing parts 30 is distributed on both sides of the first central axis A, while from the perspective of the second central axis B, the two pushing parts 30 are symmetrically arranged about the second central axis B. That is, the two pushing parts 30 are respectively connected to opposite sides of the main body 10, and the two pushing parts 30 have the same structural shape. This arrangement simplifies the processing and manufacturing of the resonator 100, and ensures that the pushing actions of the two pushing parts 30 are synchronous and consistent, resulting in high precision control of the reciprocating motion of the driven member 230, and ensuring good motion performance of the driven member 230 during its movement.

[0131] Based on the above description, it should be understood that the number of the driving part 30 can be selected according to the actual application situation, as long as it can be connected to the main body 10 and can drive the follower 230 to move relative to the stator 210. The embodiments of this application do not impose strict limitations on the number of the driving part 30.

[0132] Please refer to the following: Figures 12-21 The pushing part 30 has a symmetrical or asymmetrical structure about the first central axis A. That is, the portion of the pushing part 30 located on one side of the first central axis A is symmetrically or asymmetrically arranged with the portion located on the other side of the first central axis A. The pushing part 30 can also contact and cooperate with the driven member 230, and drive the driven member 230 to move under the excitation of the vibrator 220. The following will describe in detail the asymmetrical arrangement of the pushing part 30 about the first central axis A.

[0133] Understandably, the elastic vibration generated by the exciter 220 can be amplified to the main body 10 through resonance. Since the main body 10 is connected to the pusher 30, the vibration can be transmitted to the pusher 30, enabling it to move along an elliptical trajectory, thereby driving the driven member 230 to move relative to the pusher 30. The asymmetrical arrangement of the pusher 30 structure allows for a richer and more varied structural form, and can be adjusted to suit the space available for the camera module 300 using this piezoelectric motor 200, achieving efficient space utilization. Furthermore, it enables the resonator 100 to possess two resonant modes with different excitation frequencies, thus allowing the driven member 230 to undergo directional reciprocating translational motion.

[0134] In other words, the resonator 100 can generate two resonant modes under the excitation of the exciter 220. That is, the pusher 30 can generate two resonant modes under the excitation of the exciter 220, with different excitation frequencies and opposite vibration patterns. Specifically, when the pusher 30 is excited by alternating signals of different frequencies, these two resonant modes can push the follower 230 to move in two opposite directions, thereby realizing the reciprocating translational motion of the follower 230. Since the position of the pusher 30 is fixed and does not change, it can be understood that under the drive of the in-situ vibration of the pusher 30, the follower 230 can be pushed and move relative to the pusher 30, that is, the follower 230 can move relative to the stator 210.

[0135] Therefore, on the one hand, since the piezoelectric motor 200 uses piezoelectric drive instead of magnetic drive, there are no strong magnetic components inside the piezoelectric motor 200, and it has no magnetic interference characteristics to surrounding devices, which can improve the product competitiveness of the camera module 300 and electronic device 1000 that use the piezoelectric motor 200. On the other hand, the resonator 100 can realize the directional translation of the follower 230 with a relatively simple and easy-to-manufacture structure. Thus, when the optical structure 320 is fixed on the follower 230, it can drive the optical structure 320 to achieve directional translation together, so as to achieve better optical effect.

[0136] Please refer to the following: Figures 11-21 The pushing part 30 includes a first sidewall 31 and a second sidewall 32. The connection between the first sidewall 31 and the second sidewall 32 forms a contact foot 33 for contacting and engaging with the driven member 230. The first sidewall 31 and the second sidewall 32 are arranged at an included angle. It should be understood that the first sidewall 31 and the second sidewall 32 can constitute the external structure of the pushing part 30, and the first sidewall 31 and the second sidewall 32 are arranged at an included angle, that is, the first sidewall 31 and the second sidewall 32 are not coplanar.

[0137] Therefore, the top profile of the pushing part 30 can be triangular, and the top of the pushing part 30 can be understood as the part of the pushing part 30 that is away from the main body 10. This arrangement is beneficial to the miniaturization of the resonator 100 as a whole, and it can make the overall rigidity of the pushing part 30 greater, the structure more stable, and have better resistance to interference from external environmental factors. At the same time, because the overall rigidity of the pushing part 30 is greater, and the pushing part 30 is in contact with the driven member 230 on which the optical structure 320 is fixed, the pushing part 30 can push the heavier optical structure 320. That is, the pushing part 30 can periodically and continuously move the optical structure 320, and the driving force is stable. Therefore, the pushing part 30 can push the optical structure 320 with greater weight and stroke, making the structure of the camera module 300 more diversified and easier to meet the shooting requirements with higher requirements for the optical structure 320.

[0138] The top profile of the pushing part 30 being triangular may include an oblique triangle, an isosceles triangle, a curved triangle, or a rounded triangle. The embodiments of this application do not impose strict limitations on these cases.

[0139] Please refer to the following: Figures 11-19 In one possible implementation, the line of intersection of the first sidewall 31 and the second sidewall 32 is offset relative to the first central axis A. That is, the line of intersection of the first sidewall 31 and the second sidewall 32 is not in the same plane as the first central axis A.

[0140] It should be noted that the intersection line of the first sidewall 31 and the second sidewall 32 includes the case where the two are directly connected to form an intersection line, and the case where the two are connected in their extending directions to form an intersection line.

[0141] For example, the lengths of the first sidewall 31 and the second sidewall 32 are not equal. The length of the first sidewall 31 is its dimension along the extending direction, and the length of the second sidewall 32 is its dimension along the extending direction. Thus, the intersection line of the first sidewall 31 and the second sidewall 32 deviates from the first central axis A, and the top profile of the pusher 30 formed by the first sidewall 31 and the second sidewall 32 can present a slanted triangular shape. This helps to further ensure the asymmetrical shape of the pusher 30 structure, improve the structural stability and rigidity of the pusher 30, and provide a stable driving force for the follower 230.

[0142] Please refer to the following: Figure 20 and Figure 21 In another possible implementation, the line of intersection of the first sidewall 31 and the second sidewall 32 intersects the first central axis A. That is, the line of intersection of the first sidewall 31 and the second sidewall 32 falls on the first central axis A.

[0143] It should be noted that the intersection line of the first sidewall 31 and the second sidewall 32 includes the case where the two are directly connected to form an intersection line, and the case where the two are connected in their extending directions to form an intersection line.

[0144] For example, the length of the first sidewall 31 is equal to the length of the second sidewall 32, where the length of the first sidewall 31 is its dimension along the extending direction, and the length of the second sidewall 32 is its dimension along the extending direction. This allows the top profile of the pusher portion 30, formed by the first sidewall 31 and the second sidewall 32, to present an isosceles triangle. This arrangement, while ensuring the unique asymmetrical shape of the pusher portion 30 structure, further helps to guarantee the structural stability and rigidity of the pusher portion 30, thus providing a stable driving force for the follower 230.

[0145] Alternatively, the lengths of the first sidewall 31 and the second sidewall 32 are not equal, where the length of the first sidewall 31 is its dimension along the extending direction, and the length of the second sidewall 32 is its dimension along the extending direction. This allows the top profile of the pusher 30, formed by the first sidewall 31 and the second sidewall 32, to present a slanted triangular shape. This arrangement improves the structural rigidity and stability of the pusher 30 while maintaining its unique asymmetrical structure.

[0146] Based on the above description, it should be understood that the asymmetrical arrangement of the drive part 30 has rich and varied structural forms, which can meet the application requirements of the resonator 100 in multiple scenarios and help ensure that the resonator 100 can stably and effectively provide the driving force to drive the follower 230 to move in two opposite directions.

[0147] In the embodiments of this application, a contact foot 33 is formed at the connection between the first sidewall 31 and the second sidewall 32. The contact foot 33 can contact and engage with the follower 230, and the contact form between the contact foot 33 and the follower 230 may include line contact or surface contact.

[0148] For example, when the contact foot 33 and the follower 230 are in line contact, the contact foot 33 can present as follows: Figure 22 The shape shown in (a) is such that the first sidewall 31 and the second sidewall 32 are angled transitions. Alternatively, the contact foot 33 can present as shown in... Figure 22 The shape shown in (b) has a curved surface on the surface that contacts the follower 230. When the contact foot 33 contacts the follower 230 in a surface contact manner, the contact foot 33 can present as shown in [image / description]. Figure 22The shape shown in (c) can have a planar surface that contacts the follower 230. It should be understood that the shape of the contact foot 33 is not limited to the shape described above, and any shape that can satisfy the requirement of forming a contact fit with the follower 230 is acceptable. This embodiment does not impose strict limitations on this.

[0149] Therefore, the pusher 30 can exert a certain pre-pressure on the driven member 230 with a smaller contact area, which helps to increase the rigidity of the pusher 30 and eliminate the displacement caused by the gap between the two.

[0150] Please refer to the following: Figure 2 , Figure 3 and Figure 4 The driven member 230 includes a contact portion 240 and a mating portion 250 bent and connected to the contact portion 240. The contact portion 240 contacts the pushing portion 30 and applies an elastic holding force to the pushing portion 30. The mating portion 250 forms a gap with the stator 210 and is used to fix and connect the optical structure 320 to drive the optical structure 320 to move. It should be understood that the first surface 101 of the main body portion 10 is the surface facing the mating portion 250, and the second surface 102 of the main body portion 10 is the surface facing away from the mating portion 250. When the exciter 220 is fixed to the first surface 101 of the main body portion 10, a gap is formed between the mating portion 250 and the exciter 220. When the exciter 220 is not fixed to the first surface 101 of the main body portion 10, a gap is formed between the mating portion 250 and the main body portion 10, therefore there is always a gap between the mating portion 250 and the stator 210.

[0151] Therefore, the contact portion 240 can provide guidance for the movement of the follower 230, enabling the follower 230 to achieve translational movement under the push of the pusher 30. The mating portion 250 is bent and connected to the contact portion 240, ensuring that only the part of the follower 230 that needs to contact the pusher 30 abuts against it, while the part of the follower 230 that needs to be fixed to the optical structure 320 is kept away from the pusher 30. This facilitates the rational use of the spatial layout of the follower 230 and avoids mutual interference between the two parts due to functional differences. On the one hand, it achieves the purpose of being pushed by the pusher 30 to move; on the other hand, it can be fixed to the optical structure 320, thereby driving the optical structure 320 to move together during movement, realizing the focusing or zooming of the camera module 300.

[0152] It should be noted that, Figures 2-4The structure of the follower 230 shown is only schematically illustrating the connection relationship between the contact portion 240 and the mating portion 250, and does not specifically limit the connection position, specific structure, or quantity of each part. The structure shown in the embodiments of this application does not constitute a specific limitation on the follower 230. Any shape of the follower 230 that can achieve contact mating with the pushing portion 30 and fix the optical structure 320 is acceptable, and the embodiments of this application do not impose strict limitations on this.

[0153] The connection position and specific structure of the main body 10 and the pusher 30 in this application will be described in detail below through two specific embodiments.

[0154] First embodiment:

[0155] Please refer to the following: Figures 12-18 In the first embodiment of this application, a hollow area 34 is formed between the pushing part 30 and the main body 10. This arrangement allows the pushing part 30 to have diverse structural deformation possibilities while having the function of driving the driven member 230 to move, which is beneficial to adapting to the multi-scenario application needs of the piezoelectric motor 200.

[0156] Specifically, the pushing part 30 includes a first connecting arm 35 and a second connecting arm 36. The first connecting arm 35 and the second connecting arm 36 are respectively connected to the two sides of the same side of the main body 10. The end of the first connecting arm 35 away from the main body 10 is connected to the end of the second connecting arm 36 away from the main body 10, and the two are arranged at an angle. It should be understood that the two sides of the same side of the main body 10 refers to the two sides of one side of the main body 10.

[0157] The surface of the first connecting arm 35 away from the main body 10 forms a first sidewall 31, the surface of the second connecting arm 36 away from the main body 10 forms a second sidewall 32, and the first connecting arm 35, the second connecting arm 36 and the pushing part 30 surround to form a hollow area 34.

[0158] In this embodiment, a contact foot 33 is formed at the connection between the first sidewall 31 and the second sidewall 32, which is equivalent to forming a contact foot 33 at the connection between the first connecting arm 35 and the second connecting arm 36. The contact foot 33 can engage with the driven member 230. On the one hand, the pushing part 30 can exert a certain pre-pressure on the driven member 230 with a smaller contact area, which helps to increase the rigidity of the pushing part 30 and eliminate displacement caused by the gap between the two. On the other hand, it facilitates the pulling or pushing action of the driven member 230 to achieve better optical effects, thereby increasing overall convenience.

[0159] It should be noted that the structural possibilities of the first sidewall 31 and the second sidewall 32 that can be achieved by the connection of the first connecting arm 35 and the second connecting arm 36 can be referred to the foregoing description, and will not be repeated here.

[0160] Thus, the first connecting arm 35 and the second connecting arm 36 can cooperate to form a pushing part 30 with a hollow area 34 and capable of pushing the follower 230. By changing the structural form of the first connecting arm 35 and the second connecting arm 36, a special asymmetrical shape of the pushing part 30 about the first central axis A can be achieved. The asymmetrical arrangement of the pushing part 30 structure enables the resonator 100 to have two resonant modes with different excitation frequencies. When these two resonant modes are excited by the corresponding frequencies, the follower 230 can move in two opposite directions, thereby enabling the follower 230 to exhibit directional reciprocating translational motion.

[0161] Specifically, the resonator 100 is used to drive the driven member 230 to move in a first direction under the drive of the exciter 220 at a first frequency; the resonator 100 is also used to drive the driven member 230 to move in a second direction under the drive of the exciter 220 at a second frequency, wherein the first direction is opposite to the second direction.

[0162] Here, the first direction and the second direction can be understood as the directions in which the follower 230 moves relative to the resonator 100, that is, the follower 230 can move relative to the resonator 100 in two opposite directions. For example, the follower 230 moving in the first direction is moving to the left, and moving in the second direction is moving to the right. When the piezoelectric motor 200 is applied to the camera module 300, the left and right movements can be understood as moving back and forth along a direction parallel to the optical axis of the camera module 300.

[0163] For example, such as Figure 23 As shown, when an alternating signal with a frequency of 400 kHz is applied to the exciter 220, the trajectory of the drive unit 30 is as follows: Figure 23 The solid line represents the movement of the actuator 30 in the second and fourth quadrants, which can drive the driven member 230 to move to the left. When an alternating signal with a frequency of 600 kHz is applied to the vibrator 220, the trajectory of the actuator 30 is as follows. Figure 23 The dotted line in the diagram indicates that the actuating part 30 can move in the first and third quadrants, and can push the driven part 230 to move to the right.

[0164] The technical solution of this embodiment will be specifically described below in conjunction with the possible structures of the pushing part 30, wherein the structure of the pushing part 30 may include at least the following four solutions:

[0165] Option 1 for the propulsion unit 30: The first connecting arm 35 is formed as a connecting segment, and the second connecting arm 36 is also formed as a connecting segment.

[0166] Option 2 for the propulsion unit 30: The second connecting arm 36 is formed by at least two connecting segments extending in different directions continuously, and the second connecting arm 36 is formed by one connecting segment.

[0167] Option 3 for the propulsion unit 30: The first connecting arm 35 is formed as a connecting segment, and the second connecting arm 36 is formed by at least two connecting segments extending in different directions continuously.

[0168] Option 4 for the propulsion unit 30: The first connecting arm 35 is formed by continuously extending at least two connecting segments extending in different directions, and the second connecting arm 36 is also formed by continuously extending at least two connecting segments extending in different directions.

[0169] The following will provide a detailed explanation of the possible solutions for the four propulsion units 30 mentioned above.

[0170] Please refer to the following: Figure 13 , Figure 14 , Figure 15 and Figure 16 In the first embodiment of the pusher 30, the first connecting arm 35 and the second connecting arm 36 are each formed as a connecting segment, and they extend towards each other and are connected to one another. Thus, not only is the top profile of the pusher 30 triangular, but the overall profile of the pusher 30 is also triangular. This arrangement helps to further improve the structural rigidity and stability of the pusher 30, thereby providing a reliable driving force for pushing the driven member 230.

[0171] Please see Figure 13 In one possible implementation, the cross-sectional dimensions of the first connecting arm 35 gradually change along the extending direction, while the cross-sectional dimensions of the second connecting arm 36 are equal along the extending direction. That is, the first connecting arm 35 is a variable cross-section connecting arm, and the second connecting arm 36 is a constant cross-section connecting arm. The extending directions of the first connecting arm 35 and the second connecting arm 36 intersect.

[0172] Please see Figure 14 In another possible implementation, the cross-sectional dimensions of the first connecting arm 35 are equal along the extending direction, while the cross-sectional dimensions of the second connecting arm 36 gradually change along the extending direction. That is, the first connecting arm 35 is a connecting arm with a constant cross-section, and the second connecting arm 36 is a connecting arm with a variable cross-section. The extending directions of the first connecting arm 35 and the second connecting arm 36 intersect.

[0173] Please see Figure 15 In another possible implementation, the cross-sectional dimensions of the first connecting arm 35 gradually change along the extension direction, and the cross-sectional dimensions of the second connecting arm 36 also gradually change along the extension direction. That is, the first connecting arm 35 is a variable cross-section connecting arm, and the second connecting arm 36 is also a variable cross-section connecting arm.

[0174] In this embodiment, the extension direction of the first connecting arm 35 intersects the extension direction of the second connecting arm 36. The variation range of the cross-sectional dimension of the first connecting arm 35 can be equal to or unequal to the variation range of the cross-sectional dimension of the second connecting arm 36. This embodiment does not impose strict restrictions on this.

[0175] Please see Figure 16 In another possible implementation, the cross-sectional dimensions of the first connecting arm 35 are equal along the extending direction, and the cross-sectional dimensions of the second connecting arm 36 are also equal along the extending direction. That is, the first connecting arm 35 is a connecting arm with a constant cross-section, and the second connecting arm 36 is a connecting arm with a constant cross-section.

[0176] The extending direction of the first connecting arm 35 intersects the extending direction of the second connecting arm 36. The cross-sectional dimensions of the first connecting arm 35 and the second connecting arm 36 may be equal or unequal; this embodiment does not impose strict limitations on this.

[0177] It should be noted that the end of the first connecting arm 35 connected to the main body 10 can be completely connected to the main body 10, or it can be partially connected to the main body 10, with the remaining portion suspended outside the main body 10. When the end of the first connecting arm 35 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the first connecting arm 35 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. The end of the second connecting arm 36 connected to the main body 10 can also be completely connected to the main body 10, or it can be partially connected to the main body 10 and the remaining portion is suspended outside the main body 10. When the end of the second connecting arm 36 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the second connecting arm 36 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. This embodiment does not impose strict limitations on this.

[0178] Please see Figure 12 In Scheme 2 of the propulsion unit 30, the same content as Scheme 1 will not be repeated. The difference from Scheme 1 is that the first connecting arm 35 is formed by two connecting segments extending continuously in different directions.

[0179] For example, the first connecting arm 35 includes a first connecting segment 351 and a second connecting segment 352. The first connecting segment 351 extends from the main body 10 in a direction parallel to the first central axis A. The second connecting segment 352 is bent and connected to the first connecting segment 351, and the second connecting segment 352 extends towards the second connecting arm 36 and is connected to each other. The extending direction of the second connecting segment 352 intersects the extending direction of the second connecting arm 36.

[0180] It should be noted that the first connecting segment 351 can be a connecting segment with a constant cross-section or a connecting segment with a variable cross-section. The second connecting segment 352 can be a connecting segment with a constant cross-section or a connecting segment with a variable cross-section. For the permutations and combinations of the cross-section types of the first connecting segment 351 and the second connecting segment 352, please refer to the foregoing description, which will not be listed here.

[0181] Furthermore, the end of the first connecting segment 351 connected to the main body 10 can be completely connected to the main body 10, or it can be partially connected to the main body 10, with the remaining portion suspended outside the main body 10. When the end of the first connecting segment 351 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the first connecting segment 351 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. Similarly, the end of the second connecting arm 36 connected to the main body 10 can also be completely connected to the main body 10, or it can be partially connected to the main body 10 and the remaining portion is suspended outside the main body 10. When the end of the second connecting arm 36 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the second connecting arm 36 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. This embodiment does not impose strict limitations on this.

[0182] Therefore, by changing one or more of the dimensions of the first connecting segment 351 (such as the length of the first connecting segment 351 along the extension direction, the cross-sectional dimensions of the first connecting segment 351, etc.), the dimensions of the second connecting segment 352 (such as the length of the second connecting segment 352 along the extension direction, the cross-sectional dimensions of the second connecting segment 352, etc.), and the dimensions of the second connecting arm 36 (such as the length of the second connecting arm 36 along the extension direction, the cross-sectional dimensions of the second connecting arm 36, etc.), one or more of the dimensions of the first sidewall 31 and the second sidewall 32, the relative position of the first sidewall 31 and the second sidewall 32, the structural form and dimensions of the hollow area 34, etc., can be changed, thereby making the structure of the pushing part 30 have diverse possible variations, and enabling the resonator 100 to have multiple application scenarios.

[0183] Please see Figure 17 In Scheme 30 of the propulsion unit, the same content as Scheme 1 will not be repeated. The difference from Scheme 1 is that the second connecting arm 36 is formed by two connecting segments extending continuously in different directions.

[0184] For example, the second connecting arm 36 includes a third connecting segment 361 and a fourth connecting segment 362. The third connecting segment 361 extends from the main body 10 in a direction parallel to the first central axis A. The fourth connecting segment 362 is bent and connected to the third connecting segment 361, and the fourth connecting segment 362 extends towards the first connecting arm 35 and is connected to it. The extending direction of the fourth connecting segment 362 intersects the extending direction of the first connecting arm 35.

[0185] It should be noted that the third connecting segment 361 can be a connecting segment with a constant cross-section or a connecting segment with a variable cross-section. The fourth connecting segment can be a connecting segment with a constant cross-section or a connecting segment with a variable cross-section. For the permutations and combinations of the cross-section types of the third connecting segment 361 and the fourth connecting segment 362, please refer to the foregoing description, which will not be listed here.

[0186] Furthermore, the end of the third connecting segment 361 connected to the main body 10 can be completely connected to the main body 10, or it can be partially connected to the main body 10, with the remaining portion suspended outside the main body 10. When the end of the third connecting segment 361 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the third connecting segment 361 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. The end of the first connecting arm 35 connected to the main body 10 can also be completely connected to the main body 10, or it can be partially connected to the main body 10 and the remaining portion is suspended outside the main body 10. When the end of the first connecting arm 35 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the first connecting arm 35 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. This embodiment does not impose strict limitations on this.

[0187] Therefore, by changing one or more of the dimensions of the first connecting arm 35 (such as the length of the first connecting arm 35 along the extension direction, the cross-sectional dimensions of the first connecting arm 35, etc.), the dimensions of the third connecting segment 361 (such as the length of the third connecting segment 361 along the extension direction, the cross-sectional dimensions of the third connecting segment 361, etc.), and the dimensions of the fourth connecting segment 362 (such as the length of the fourth connecting segment 362 along the extension direction, the cross-sectional dimensions of the fourth connecting segment 362, etc.), one or more of the dimensions of the first sidewall 31 and the second sidewall 32, the relative position of the first sidewall 31 and the second sidewall 32, the structural form and dimensions of the hollow area 34, etc., can be changed, thereby making the structure of the pushing part 30 have diverse possible variations, and enabling the resonator 100 to have multiple application scenarios.

[0188] Please see Figure 18In Scheme 4 of the propulsion unit 30, the same content as Scheme 1 will not be repeated. The difference from Scheme 2 is that the second connecting arm 36 is formed by two connecting segments extending continuously in different directions.

[0189] For example, the second connecting arm 36 includes a third connecting segment 361 and a fourth connecting segment 362. The third connecting segment 361 extends from the main body 10 in a direction parallel to the first central axis A. The fourth connecting segment 362 is bent and connected to the third connecting segment 361, and the fourth connecting segment 362 extends towards the second connecting segment 352 and is connected to each other. The extending direction of the fourth connecting segment 362 intersects the extending direction of the second connecting segment 352.

[0190] It should be noted that the third connecting segment 361 can be a connecting segment with a constant cross-section or a connecting segment with a variable cross-section. The fourth connecting segment 362 can be a connecting segment with a constant cross-section or a connecting segment with a variable cross-section. For the permutations and combinations of the cross-section types of the third connecting segment 361 and the fourth connecting segment 362, please refer to the foregoing description, which will not be listed here.

[0191] Furthermore, the end of the first connecting segment 351 connected to the main body 10 can be completely connected to the main body 10, or it can be partially connected to the main body 10, with the remaining portion suspended outside the main body 10. When the end of the first connecting segment 351 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the first connecting segment 351 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20. Similarly, the end of the third connecting segment 361 connected to the main body 10 can be completely connected to the main body 10, or it can be partially connected to the main body 10 and the remaining portion is suspended outside the main body 10. When the end of the third connecting segment 361 connected to the main body 10 is partially connected to the main body 10 and the remaining portion is suspended outside the main body 10, the portion of the third connecting segment 361 suspended outside the main body 10 can be connected to the fixing part 20, or it can be spaced apart from the fixing part 20.

[0192] Therefore, by changing one or more of the dimensions of the first connecting segment 351 (such as the length of the first connecting segment 351 along the extension direction, the cross-sectional dimensions of the first connecting segment 351, etc.), the dimensions of the second connecting segment 352 (such as the length of the second connecting segment 352 along the extension direction, the cross-sectional dimensions of the second connecting segment 352, etc.), the dimensions of the third connecting segment 361 (such as the length of the third connecting segment 361 along the extension direction, the cross-sectional dimensions of the third connecting segment 361, etc.), and the dimensions of the fourth connecting segment 362 (such as the length of the fourth connecting segment 362 along the extension direction, the cross-sectional dimensions of the fourth connecting segment 362, etc.), one or more of the dimensions of the first sidewall 31 and the second sidewall 32, the relative position of the first sidewall 31 and the second sidewall 32, the structural form and dimensions of the hollow area 34, etc., can be changed, thereby making the structure of the pushing part 30 have diverse possible variations, and enabling the resonator 100 to have multiple application scenarios.

[0193] Referring to the four structural schemes of the propulsion unit 30 described above, it should be understood that by changing the structural form and size of the first connecting arm 35 and the second connecting arm 36, it is possible to adjust the size and relative position of the first sidewall 31 and the second sidewall 32, and also to adjust the structural form and size of the hollow area 34 (e.g., the hollow area 34 in Scheme 1 can be triangular, in Schemes 2 and 3 it can be quadrilateral, and in Scheme 4 it can be pentagonal). In other words, the structural form and size of the hollow area 34 will change with the changes in the structural form and size of the first connecting arm 35 and the second connecting arm 36. The variations and combinations of the dimensions of the first connecting arm 35 and the second connecting arm 36 will not be listed here.

[0194] Therefore, the dimensions of the first connecting arm 35 and the second connecting arm 36 can be adjusted according to the actual application of the resonator 100 (such as material cost control, rigidity requirements, actuation force requirements, etc.) to adapt to the application requirements of multiple scenarios. That is, by adjusting the dimensions of the first connecting arm 35 and the second connecting arm 36, the final structural form of the pushing part 30 can be changed, thereby improving the shooting quality of the camera module 300 using the resonator 100. For example, the driven member 230 can push the optical structure 320 with a large weight and stroke, or it can push the optical structure 320 faster to achieve the positional matching between the optical structures 320 in a shorter time, so as to achieve the positional matching between the optical structures 320 required to achieve the zoom effect.

[0195] Please refer to the following: Figure 19 , Figure 20 and Figure 21 In the second embodiment of this application, the same content as in the first embodiment will not be repeated. The difference from the first embodiment is that the pushing part 30 is a solid closed structure.

[0196] In this embodiment, the end of the pushing part 30 connected to the main body 10 can be completely connected to the main body 10, or it can be partially connected to the main body 10 and partially suspended around the main body 10. In other words, the pushing part 30 can be the same length as the main body 10, or the pushing part 30 can be of unequal length to the main body 10 (e.g., the length of the pushing part 30 is greater than the length of the main body 10). When the end of the pushing part 30 connected to the main body 10 is partially connected to the main body 10 and partially suspended around the main body 10, the portion of the pushing part 30 suspended around the main body 10 can be connected to the fixing part 20 or spaced apart from the fixing part 20.

[0197] It is understood that in this embodiment, when the structures of the fixing portions 20 on both sides of the first central axis are asymmetrical (e.g., the number of fixing portions 20 on both sides of the first central axis A is inconsistent), the pushing portion 20 can be as follows: Figure 19 The asymmetrical arrangement about the first central axis A shown, or the pusher 20 can also be as follows: Figure 20 and Figure 21 The arrangement shown is symmetrical about the first central axis A. However, when the pushing part 20 is asymmetrical about the first central axis A, the asymmetry in the structure of the fixing part 20 also allows for a unique asymmetrical structure in the resonator 100. This asymmetrical arrangement of the resonator 100 allows for a richer and more varied structural form, and can be adjusted to suit the space available for the camera module 300 using this piezoelectric motor 200, achieving efficient space utilization. Furthermore, it enables the resonator 100 to possess two resonant modes with different excitation frequencies, thereby causing the driven member to undergo directional reciprocating translational motion.

[0198] It should be noted that the pushing part 30 can be triangular or polygonal. The structural form of the pushing part 30 is not strictly defined, as long as the connection between the first sidewall 31 and the second sidewall 32 of the pushing part 30 can form a contact foot 33.

[0199] Thus, a solid, enclosed pushing part 30 capable of pushing the driven member 230 can be formed. Through the structural form of the pushing part 30, a special asymmetrical shape of the pushing part 30 about the first central axis A can be achieved. The asymmetrical arrangement of the pushing part 30 structure enables the resonator 100 as a whole to have two resonant modes with different excitation frequencies. When these two resonant modes are excited by the corresponding frequencies, the driven member 230 can achieve two opposite directions of movement, thereby enabling the driven member 230 to exhibit directional reciprocating translational motion.

[0200] For example, such as Figure 24 As shown, when an alternating signal with a frequency of 600 kHz is applied to the exciter 220, the trajectory of the drive unit 30 is as follows: Figure 24 The solid line represents the movement of the actuator 30 in the first and third quadrants, which can drive the driven member 230 to move to the right. When an alternating signal with a frequency of 700 kHz is applied to the vibrator 220, the trajectory of the actuator 30 is as follows. Figure 24 The dotted line in the diagram indicates that the actuating part 30 can move in the second and fourth quadrants, and can push the driven part 230 to move to the left.

[0201] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A piezoelectric motor, characterized in that, The piezoelectric motor includes: Vibrator; The driven member includes a contact portion and a mating portion, the contact portion being connected to the mating portion and bent relative to the mating portion, along the thickness direction of the exciter, the projection of the exciter onto the driven member falling on the mating portion; and A resonator, along the thickness direction of the exciter, has its projection on the driven member falling on the mating portion, and a gap is formed between the resonator and the mating portion. The resonator includes a main body and a pushing portion. The main body includes a first central axis, and the main body is distributed on both sides of the first central axis. The exciter is fixed to the main body. The pushing portion is connected to the main body and distributed on both sides of the first central axis. The pushing portion has an asymmetrical structure about the first central axis so that the resonator has two resonant modes with different excitation frequencies. The pushing portion contacts the contact portion and is used to push the driven member to move under the excitation of the exciter, causing the driven member to undergo directional reciprocating translational motion. The top of the pushing portion is used to contact the driven member. The pushing portion is triangular or polygonal, wherein each side of the pushing portion is a straight line or a curve.

2. The piezoelectric motor as described in claim 1, characterized in that, The pushing part includes a first sidewall and a second sidewall. The first sidewall includes a sidewall with one or more sides, and the second sidewall includes a sidewall with one or more sides. The connection between the first sidewall and the second sidewall forms a contact foot for contacting and engaging with the driven member. The first sidewall and the second sidewall are arranged at an angle.

3. The piezoelectric motor as described in claim 2, characterized in that, The intersection line of the first sidewall and the second sidewall is offset relative to the first central axis. The lengths of the first sidewall and the second sidewall are not equal. The length of the first sidewall is the dimension of the first sidewall along the extension direction, and the length of the second sidewall is the dimension of the second sidewall along the extension direction.

4. The piezoelectric motor as described in claim 2, characterized in that, The line of intersection between the first sidewall and the second sidewall intersects the first central axis; The length of the first sidewall is equal to the length of the second sidewall, where the length of the first sidewall is its dimension along the extending direction, and the length of the second sidewall is its dimension along the extending direction; or... The lengths of the first sidewall and the second sidewall are not equal. The length of the first sidewall is the dimension of the first sidewall along the extension direction, and the length of the second sidewall is the dimension of the second sidewall along the extension direction.

5. The piezoelectric motor as described in any one of claims 3 or 4, characterized in that, A hollow area is formed between the pushing part and the main body part; or... The propulsion part is a solid, closed structure.

6. The piezoelectric motor as described in claim 5, characterized in that, The pushing part includes a first connecting arm and a second connecting arm, the first connecting arm and the second connecting arm are respectively connected to two sides of the same side of the main body, and the end of the first connecting arm away from the main body is connected to the end of the second connecting arm away from the main body; The surfaces of the first connecting arm and the second connecting arm away from the main body form the first sidewall and the second sidewall, and the first connecting arm, the second connecting arm and the pushing part surround the hollow area; The dimensions of the cross-section of the first connecting arm gradually change along the extension direction and / or the dimensions of the cross-section of the second connecting arm gradually change along the extension direction.

7. The piezoelectric motor as described in claim 5, characterized in that, The pushing part includes a first connecting arm and a second connecting arm, the first connecting arm and the second connecting arm are respectively connected to two sides of the same side of the main body, and the end of the first connecting arm away from the main body is connected to the end of the second connecting arm away from the main body; The surfaces of the first connecting arm and the second connecting arm away from the main body form the first sidewall and the second sidewall, and the first connecting arm, the second connecting arm and the pushing part surround the hollow area; The dimensions of the cross-section of the first connecting arm are equal along the extension direction and / or the dimensions of the cross-section of the second connecting arm are equal along the extension direction.

8. The piezoelectric motor as described in claim 2, characterized in that, The contact form between the contact foot and the driven member includes line contact or surface contact.

9. The piezoelectric motor according to any one of claims 1-8, characterized in that, The piezoelectric motor also includes a fixing part connected to the main body, the fixing part and the pushing part being located on different sides of the main body, and the fixing part being able to fix the piezoelectric motor to an external structural component; The number of fixing parts is two, and the two fixing parts are distributed on both sides of the first central axis; or, The number of fixing parts is multiple, and the multiple fixing parts are distributed on both sides of the first central axis. The number of fixing parts distributed on one side of the first central axis is the same as the number of fixing parts distributed on the other side of the first central axis; or, The number of fixing parts is multiple, and the multiple fixing parts are distributed on both sides of the first central axis. The number of fixing parts distributed on one side of the first central axis is different from the number of fixing parts distributed on the other side of the first central axis.

10. The piezoelectric motor according to any one of claims 1-8, characterized in that, The main body also includes a second central axis, which is perpendicular to the first central axis; The number of the pushing parts is one, and they are distributed on one side of the second central axis; or, The number of the pushing parts is two, and they are symmetrically distributed on both sides of the second central axis.

11. The piezoelectric motor according to any one of claims 1-10, characterized in that, The vibration generated by the exciter when powered on can be amplified by the main body and transmitted to the driving part, so that the driving part drives the driven member to move. The number of vibrators is one, and one vibrator is connected to one of the opposite sides of the main body; or... The number of vibrators is two, and the two vibrators are respectively connected to opposite sides of the main body.

12. The piezoelectric motor according to any one of claims 1-10, characterized in that, The resonator is used to drive the driven member to move in a first direction under the drive of the exciter at a first frequency; The resonator is also used to drive the follower to move in a second direction, which is opposite to the first direction, under the drive of the exciter at the second frequency.

13. The piezoelectric motor as described in claim 1, characterized in that, The contact portion contacts the pushing portion and applies an elastic holding force to the pushing portion. The mating portion forms a gap with the vibrator or the main body portion and is used to fix and connect the optical structure so as to drive the optical structure to move.

14. A camera module, characterized in that, The camera module includes a base, an optical structure, and a piezoelectric motor as described in any one of claims 1-13, wherein the resonator is fixed to the base, and the optical structure is fixed to the follower to move relative to the base under the drive of the resonator.

15. An electronic device, characterized in that, The electronic device includes a housing and a camera module as described in claim 14, the camera module being housed within the housing.

Images