Driving device, camera module and terminal

Abstract

Embodiments of the present invention provide a driving device, a camera module and a terminal. The driving device comprises a base, a rotating sleeve, a moving carrier and a piezoelectric motor, wherein the rotating sleeve is rotatably connected to the base around a first axis in a first direction, the moving carrier is movably mounted in the rotating sleeve in the first direction, a guide inclined groove is formed in one of the rotating sleeve and the moving carrier, a sliding portion is formed on the other of the rotating sleeve and the moving carrier, the sliding portion is in sliding fit with the guide inclined groove, the piezoelectric motor and the rotating sleeve are adjacently arranged in a second direction perpendicular to the first direction, and the piezoelectric motor is used for driving the rotating sleeve to rotate around the first axis, so that the rotating sleeve drives, by means of the guide inclined groove and the sliding portion, the moving carrier to move in the first direction.

Description

A driving device, camera module and terminal

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application filed on June 24, 2024, with application number 202410826042.4 and entitled "Driver, Camera Module and Terminal", the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present invention relates to the field of camera module technology, and in particular to a driving device, camera module and terminal. Background Technology

[0004] To achieve specific functions, terminals often incorporate drive mechanisms to power specific components. These drive mechanisms are typically large, occupying significant internal space and potentially interfering with other structures within the terminal, thus complicating structural design. This is particularly true in portable terminals (such as mobile phones or tablets), where internal space is extremely limited. With the trend towards thinner terminals, existing drive mechanisms are increasingly failing to meet the demands. Summary of the Invention

[0005] This invention provides a driving device, a camera module, and a terminal. The driving device occupies little space and is flexible in arrangement, which is conducive to its placement in a thin terminal.

[0006] In a first aspect, embodiments of the present invention provide a driving device, including a base, a rotating sleeve, a movable carrier, and a piezoelectric motor. The rotating sleeve is rotatably connected to the base about a first axis in a first direction. The movable carrier is movably installed inside the rotating sleeve along the first direction. One of the rotating sleeve and the movable carrier has a guide groove, and the other of the rotating sleeve and the movable carrier has a sliding portion that slides into the guide groove. The piezoelectric motor and the rotating sleeve are arranged adjacent to each other in a second direction perpendicular to the first direction. The piezoelectric motor drives the rotating sleeve to rotate about the first axis, so that the rotating sleeve drives the movable carrier to move along the first direction via the guide groove and the sliding portion.

[0007] It should be noted that a piezoelectric motor is an electric motor that converts electrical energy into mechanical energy using the inverse piezoelectric effect of piezoelectric materials. A piezoelectric motor typically includes a vibrating component and a moving component. The vibrating component is connected to a drive circuit, and under the action of voltage, it vibrates to drive the moving component to produce rotational or linear motion. Piezoelectric motors have the advantages of small size, fast response speed, and low noise. Furthermore, they do not generate electromagnetic radiation during operation and are unaffected by surrounding electromagnetic fields, thus exhibiting excellent anti-electromagnetic interference performance.

[0008] In the above embodiment, the piezoelectric motor drives the rotating sleeve to rotate around the first axis. During the rotation of the rotating sleeve around the first axis, the rotating sleeve drives the moving carrier to move in the first direction through the guide groove and the sliding part. In this way, the rotational torque output by the piezoelectric motor can be converted into an axial force driving the moving carrier to move along the first direction through the rotating sleeve, thereby realizing the conversion of the motion trajectory. Furthermore, the piezoelectric motor drives the moving carrier to move along the first direction from the outer part of the rotating sleeve. The piezoelectric motor and the rotating sleeve are arranged adjacent to each other in a second direction perpendicular to the first direction, which makes the arrangement of the piezoelectric motor more flexible. This arrangement can avoid the piezoelectric motor occupying space in the first direction, reduce the overall size of the drive device in the first direction, and make the structure of the drive device more compact, which is more conducive to its arrangement in a thin terminal.

[0009] In some possible implementations of the first aspect, the vibrating element in the above embodiments includes multiple layers of piezoelectric ceramic sheets stacked along the thickness direction, with the multiple piezoelectric ceramic sheets connected in parallel. The multiple piezoelectric ceramic sheets are connected in parallel to the driving circuit, enabling each of the multiple piezoelectric ceramic sheets to deform and drive the moving part to rotate under a relatively small driving voltage, thus adapting to low-driving-voltage operating environments.

[0010] In some possible embodiments of the first aspect, the piezoelectric motor is a traveling wave piezoelectric motor or a standing wave piezoelectric motor. A traveling wave piezoelectric motor refers to a piezoelectric motor whose vibrating element generates a traveling wave that propagates in a specific direction to drive a moving part; traveling wave piezoelectric motors have good positioning and speed control accuracy. A standing wave piezoelectric motor, on the other hand, refers to a piezoelectric motor whose vibrating element generates a standing wave that remains stationary to drive a moving part.

[0011] In an embodiment where the piezoelectric motor is a traveling wave type, the piezoelectric motor, exemplarily, includes a vibrating element and a moving element, which are stacked along the thickness direction. The vibrating element deforms in the thickness direction and drives the moving element to rotate around a second axis. In one embodiment, the second axis has an angle with the first axis that is not equal to 0 degrees or 180 degrees; for example, the second axis is perpendicular to the first axis. This angle can be the angle between the coplanar first and second axes, or it can be the angle between the projections of one of the non-coplanar first and second axes onto any given plane. The moving element includes an output gear, and a meshing portion is formed on the outer periphery of the rotating sleeve. The output gear engages with the meshing portion. The piezoelectric motor drives the moving element to rotate circumferentially via the vibrating element. The moving element drives the output gear to rotate via a central shaft. The output gear engages with the meshing portion, and the meshing transmission has stable and good transmission efficiency, enabling the rotating sleeve to rotate precisely.

[0012] For example, the drive voltage of a piezoelectric motor is less than or equal to 12V. A piezoelectric motor that meets this voltage requirement can be adapted to the voltage limitations of portable terminals (such as mobile phones).

[0013] In some possible embodiments of the first aspect, the output gear is a bevel gear, the meshing part is a conical meshing part, and the first axis is perpendicular to the second axis. In this way, the output gear and the meshing part can form a bevel gear pair, which facilitates the arrangement of the piezoelectric motor on the side of the rotating sleeve, and the structure of the piezoelectric motor and the rotating sleeve is more compact and occupies less space.

[0014] In an embodiment where the piezoelectric motor is a standing wave type piezoelectric motor, the piezoelectric motor includes, for example, a vibrating element and a preload structure. A friction portion is provided on the outer circumferential surface of the rotating sleeve. The preload structure provides an elastic force that causes the vibrating element to abut against the friction portion of the rotating sleeve, so that when the vibrating element vibrates, it drives the rotating sleeve to rotate around a first axis via the friction portion. For example, the preload structure is a spring, a sheet spring, or an elastic block. One end of the preload structure abuts against the housing of the piezoelectric motor or other fixed structure, and the other end abuts against the vibrating element. Thus, during the deformation process under voltage excitation, the vibrating element continuously abuts against and moves away from the friction portion of the rotating sleeve, thereby continuously applying a driving force to the rotating sleeve.

[0015] In some possible embodiments of the first aspect, the friction portion of the rotating sleeve is a region on the outer peripheral surface of the rotating sleeve. Exemplarily, the friction portion is a region on the outer peripheral surface of the rotating sleeve with a high coefficient of friction, and the friction portion can be made by a surface roughening process or by spraying a material with a high coefficient of friction.

[0016] In some possible embodiments of the first aspect, the rotating sleeve includes a rotating ring and a driven ring, which are sequentially arranged and connected along a first direction. A friction portion is formed on the outer circumferential surface of the rotating ring, and a guide groove is formed on the driven ring. The rotating ring and the driven ring are formed separately, allowing them to be made of different materials or using different processing methods to facilitate manufacturing.

[0017] For example, the rotating ring and the driven ring are made of different materials. The rotating ring is made of stainless steel to provide good hardness and improve its service life. The outer surface of the rotating ring can be roughened or plated to achieve a surface with a high coefficient of friction. Alternatively, the driven ring can be made of plastic. In embodiments where the driven ring is made of plastic, the driven ring has a smaller mass, higher transmission efficiency, and lower transmission noise during its interaction with the moving carrier and transmission of driving force.

[0018] In some possible embodiments of the first aspect, the drive device includes a bearing, with the inner ring of the bearing fitted onto the base and a rotating sleeve fitted onto the outer ring of the bearing. The bearing not only restricts the rotation trajectory of the rotating sleeve but also reduces the frictional force experienced by the rotating sleeve during rotation, thereby facilitating smooth and stable rotation of the rotating sleeve.

[0019] In some possible embodiments of the first aspect, a receiving groove is formed on the end face of the base facing the rotating sleeve, and / or a receiving groove is formed on the end face of the rotating sleeve facing the base; wherein the driving device includes a ball bearing located within the receiving groove and supported between the base and the rotating sleeve. This ball bearing can reduce the friction between the base and the rotating sleeve, thereby improving the transmission efficiency of the piezoelectric motor driving the rotating sleeve to rotate, while simultaneously reducing the motion noise of the rotating sleeve.

[0020] In some possible embodiments of the first aspect, a first magnetic part is provided on the base, and a second magnetic part is provided on the rotating sleeve. The first and second magnetic parts have repulsive magnetism. Under the action of the mutual repulsive force, the friction between the base and the rotating sleeve is reduced, which can improve the transmission efficiency of the piezoelectric motor driving the rotating sleeve to rotate, while reducing the motion noise of the rotating sleeve. For example, the projection of the second magnetic part along the first direction is always located within the projection of the first magnetic part along the first direction. In this way, during the rotation of the rotating sleeve, both the base and the rotating sleeve can be subjected to the mutual repulsive force generated by the first and second magnetic parts.

[0021] In some possible embodiments of the first aspect, the drive device includes a guide structure, through which the mobile carrier is mounted on a base or terminal, such that the guide structure can restrict the movement of the mobile carrier so that the mobile carrier can only move in a first direction.

[0022] In some embodiments, the guide structure is a guide rod extending along a first direction, and the moving carrier slides with the guide rod through a groove structure or a hole structure, wherein the guide rod is fixedly connected to the base, or the guide rod is fixedly connected to the terminal (e.g., the back plate of the terminal).

[0023] In some possible embodiments of the first aspect, the driving device further includes an elastic buffer, one end of which is connected to the moving carrier, and the other end of which is connected to the optical lens. When the light-incident end of the optical lens (e.g., the protective glass of the optical lens or the lens decorative structure) is located outside the back panel of the terminal, the optical lens is subjected to an external force (e.g., the user presses the optical lens), causing the optical lens to press down on the elastic buffer and move toward the inside of the terminal. When the external force is removed, the optical lens and the lens decorative structure can return to their original positions under the elastic force of the elastic buffer.

[0024] Secondly, the present invention provides a camera module, including an optical lens, a photosensitive element, and a driving device as described in any of the above possible embodiments. The photosensitive element is located on the image side of the optical lens, and light emitted from the optical lens can form an image on the photosensitive element. The moving carrier of the driving device is connected to the optical lens.

[0025] For example, the moving carrier of the driving device is connected to the optical lens. Thus, when the moving carrier moves along the first axis, it drives the optical lens to move along the first axis, allowing the optical lens to be positioned at different locations along the first axis. In particular, considering that in a mobile phone, the piezoelectric motor and the rotating sleeve are arranged adjacent to each other in the second direction, the thickness of the phone can be reduced, achieving a thinner design. Furthermore, the piezoelectric motor occupies space on one side, thereby saving space on the other side of the camera module and avoiding interference with other internal structures of the phone (such as chips).

[0026] In some possible implementations of the second aspect, the camera module has a first state and a second state. In the first state, the distance between the optical lens and the base is a first distance, and in the second state, the distance between the optical lens and the base is a second distance, which is greater than the first distance. In this embodiment, when the camera module is in the first state (i.e., the retracted state), the optical lens and the base have a smaller first distance, resulting in a more compact structure that facilitates placement of the camera module in the terminal and reduces the height of the optical lens protruding from the back panel of the phone, thus achieving a thinner design for the phone. When the camera module switches to the second state (i.e., the usage state), the optical lens and the base have a larger second distance, giving the camera module a longer back focal length, which can meet higher shooting requirements and facilitates obtaining images with good imaging quality.

[0027] In some embodiments, the photosensitive element of the camera module may be fixed on the base of the driving device, or the photosensitive element and the base may be fixed on a circuit board within the terminal. For example, the base is formed as a ring, with space reserved corresponding to the optical lens for mounting the photosensitive element.

[0028] Thirdly, the present invention provides a terminal including an image processor and a camera module in any of the above possible embodiments. The image processor is communicatively connected to the camera module. The camera module is used to acquire image data and input the image data into the image processor. The image processor is used to process the image data. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the structure of a terminal provided in an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of another terminal provided in an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of the structure of a camera module provided in an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of a camera module provided in an embodiment of the present invention, wherein the piezoelectric motor is omitted;

[0033] Figure 5 is a partial cross-sectional view of a camera module provided in an embodiment of the present invention;

[0034] Figure 6 is a top view of a camera module provided in an embodiment of the present invention, wherein the piezoelectric motor and the rotating sleeve are omitted;

[0035] Figure 7 is a structural schematic diagram of a camera module's moving carrier, guide rod, and elastic buffer provided in an embodiment of the present invention.

[0036] Figure 8 is a cross-sectional view of a piezoelectric motor provided in an embodiment of the present invention;

[0037] Figure 9 is a structural schematic diagram of a camera module provided in an embodiment of the present invention;

[0038] Figure 10 is a cross-sectional view of a camera module provided in an embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0040] Hereinafter, the terms "first," "second," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0041] In embodiments of the present invention, unless otherwise expressly specified and limited, the term "connection" can be a direct connection or an indirect connection achieved through an intermediate structure. The term "electrical connection" can be a direct electrical connection or an indirect electrical connection through an intermediate medium. Words such as "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0042] In embodiments of the invention, the directional indications used to explain the structure and movement of different components, such as up, down, left, right, front, and back, are relative. These indications are appropriate when the components are in the positions shown in the figures. However, if the description of the component positions changes, these directional indications will also change accordingly. It should also be noted that in embodiments of the invention, the same reference numerals represent the same component or part. For the same parts in embodiments of the invention, the reference numerals may only be used to indicate one part or component as an example in the figures. It should be understood that the reference numerals also apply to other identical parts or components.

[0043] The specific structures of the driving device, camera module 100, and terminal 1000 provided in the embodiments of the present invention will be described in detail below with reference to the relevant accompanying drawings.

[0044] As shown in Figure 1, in a first aspect, the present invention provides a terminal, examples of which include, but are not limited to: mobile phones, computers, tablet computers, PDAs, desktop computers, headphones, speakers, wearable devices, projection devices, in-vehicle devices, virtual reality devices, augmented reality devices, smart home devices (such as televisions, robot vacuum cleaners, smart lamps, audio systems, smart lighting systems, electrical control systems, home background music systems, home theater systems, intercom systems, video surveillance, etc.), smart transportation devices (such as automobiles, ships, drones, trains, freight cars, trucks, etc.), and smart manufacturing devices (such as robots, industrial equipment, smart logistics, smart factories, etc.). Figure 1 is a schematic diagram of the structure of a terminal 1000 according to an embodiment of the present invention. In this embodiment, the terminal 1000 is a mobile phone, and the back panel 1005 of the terminal 1000 is shown. The following embodiments use a mobile phone as an example for description.

[0045] In some embodiments, the terminal 1000 includes a camera module 1001 and an image processor 1003. The image processor 1003 is communicatively connected to the camera module 1001. The camera module 1001 acquires images and inputs them into the image processor 1003, which processes the images. For example, the image processor 1003 may be an image processing chip or a digital signal processing (DSP) chip. Its function is to transmit the data acquired by the photosensitive element of the camera module 1001 to the central processing unit (CPU) in a timely and rapid manner and refresh the photosensitive element. The image processor's processing of image data can affect image quality (such as color saturation and sharpness). For example, the image processor 1003 may be integrated into other chips (such as a CPU chip). For example, the communication connection between the camera module 1001 and the image processor 1003 can achieve data transmission through electrical connections such as wiring, or through coupling. The camera module 1001 and the image processor 1003 can also be connected to each other through any other means that can achieve data transmission, and the present invention does not impose any specific limitations on this.

[0046] In practical applications, both the camera module 1001 and the image processor 1003 are housed inside the terminal 1000. A light-transmitting port or transparent portion is provided on the back panel 1005 or display panel of the terminal 1000. The light-inlet end of the camera module 1001 is positioned opposite the light-transmitting port or transparent portion, allowing external light to enter the camera module 1001 and enabling it to perform its shooting function. In some embodiments, the camera module 1001 is located on the front of the terminal 1000, serving as a front-facing camera. In other embodiments, the camera module 1001 is located on the back of the terminal 1000, serving as a rear-facing camera. Both the front-facing and rear-facing cameras can be used for selfies or for the photographer to capture images of other objects; this invention does not impose specific limitations.

[0047] In some embodiments, the terminal 1000 may have multiple camera modules 1001, where "multiple" refers to two or more. Different camera modules 1001 may have the same or different structures and performance to meet different shooting requirements. For example, in some embodiments, the multiple camera modules 1001 include zoom camera modules or fixed-focus camera modules to achieve zoom shooting and fixed-focus shooting respectively. All multiple camera modules 1001 can be communicatively connected to the image processor 1003, and the multiple camera modules 1001 can selectively cooperate to achieve better shooting results. It should be noted that the installation position of the camera modules 1001 in the embodiment shown in Figure 1 is merely illustrative. In some other embodiments, the camera modules 1001 are installed in other locations on the phone, such as the upper part, upper left corner, or upper right corner of the back of the phone. Alternatively, in some embodiments, the camera module 1001 is not disposed on the main body of the mobile phone, but on a component that is movable or rotatable relative to the mobile phone, such as a component that can extend outward, retract, or rotate from the main body of the mobile phone.

[0048] In some embodiments, the terminal 1000 includes an analog-to-digital converter 1002 (also referred to as an A / D converter). The analog-to-digital converter 1002 is connected between the camera module 1001 and the image processor 1003. The analog-to-digital converter 1002 is used to convert the signal generated by the camera module 1001 into a digital image signal and transmit it to the image processor 1003. The image processor 1003 then processes the digital image signal and finally displays the image or video on a display screen or monitor.

[0049] As shown in Figure 2, in some embodiments, the terminal 1000 includes a memory 1004, which is communicatively connected to an image processor 1003. The image processor 1003 processes the digital image signal and then transmits the image to the memory 1004, so that the image can be retrieved from the memory 1004 and displayed on the screen when it is needed to view the image later. In some embodiments, the image processor 1003 compresses the processed digital image signal before storing it in the memory 1004 to save space in the memory 1004. It should be noted that Figure 2 is only a schematic diagram of the structure of the terminal 1000 provided in an exemplary embodiment of the present invention. The positions and structures of the camera module 1001, image processor 1003, analog-to-digital converter 1002, and memory 1004 shown are only illustrative, and the present invention does not limit their positions and specific structures.

[0050] In some embodiments, the camera module 1001 includes an optical lens 101 and a photosensitive element (not shown), the photosensitive element being located on the image side of the optical lens 101.

[0051] The optical lens 101 includes one or more optical lenses, and the light from the subject passes through the optical lens 101 for light processing. Exemplarily, the optical lens 101 includes a bracket and a plurality of optical lenses mounted on the bracket. In some embodiments, the optical lens 101 further includes a protective glass located at the light-incident end. The protective glass is used to protect the optical lenses inside the optical lens 101. Generally, the protective glass does not have optical power, that is, the protective glass does not have the function of diverging or converging light.

[0052] The light processed by the optical lens 101 forms an image on the photosensitive element, which is a semiconductor chip containing hundreds of thousands to millions of photodiodes on its surface. When these photodiodes are exposed to light, they generate an electrical charge, which is then converted into a digital signal by an analog-to-digital converter (ADC). The target surface size of the photosensitive element refers to the size of the effective photosensitive area on the element capable of receiving images. A larger target surface results in greater clarity and higher image quality for the camera module 1001. Furthermore, the photosensitive element is fixed to the circuit board via bonding or surface mounting. The analog-to-digital converter 1002, image processor 1003, and memory 1004 can also be connected to the circuit board via bonding or surface mounting, thus enabling communication between the photosensitive element, analog-to-digital converter 1002, image processor 1003, and memory 1004. The circuit board can be a flexible printed circuit (FPC) or a printed circuit board (PCB) used for transmitting electrical signals.

[0053] In some embodiments, the camera module 1001 is a zoom camera module, which further includes a zoom drive component. The zoom drive component drives relevant components within the camera module 1001 to change the focal length of the camera module 1001. The camera module 1001 adjusts the focal length to obtain a clear image when shooting objects at different distances. For example, the focus drive component drives one or more optical lenses in the optical lens 101 to move along the optical axis, or it drives the photosensitive element to move along the optical axis, so that the light processed by the optical lens 101 can be clearly imaged on the photosensitive element. For example, the zoom drive component is specifically a drive structure such as a motor or electric motor.

[0054] In some embodiments, the camera module 1001 further includes an image stabilization driver, which drives relevant components of the camera module 1001 to compensate for the optical path of the optical lens when the terminal 1000 shakes or vibrates, thereby ensuring that the camera module 1001 has a stable state and achieves clear imaging. For example, the image stabilization driver drives the optical lens 101 to move or rotate in a direction perpendicular to the optical axis, thereby achieving optical image stabilization of the optical lens 101.

[0055] In some exemplary embodiments, the camera module also includes a lens decorative structure 19 (commonly referred to in the industry as a Deco or lens Deco). The lens Deco is located at the light-incident end of the optical lens 101 and serves to protect and decorate the optical lens 101 within the camera module. Taking the camera module 1001 located on the back of the terminal 1000 as an example of a rear camera of the terminal 1000, the arrangement of the camera module requires significant space in the thickness direction of the terminal. In some embodiments, the light-incident end of the optical lens 101 protrudes from the back panel 1005 of the phone. Therefore, the lens Deco is typically located on the outside of the back panel 1005. The lens Deco has a transparent light-transmitting portion, and the light-incident end of the optical lens 101 is correspondingly arranged with this light-transmitting portion. In this way, the lens Deco can protect and decorate the light-incident end of the optical lens 101. In some embodiments, multiple optical lenses 101 of the terminal 1000 share the same lens Deco, which has multiple light-transmitting portions, each corresponding to a different optical lens 101.

[0056] Based on the above embodiments, the terminal 1000 achieves image capture through the following working principle: light reflected from the subject passes through the optical lens 101 to generate an optical image, which is projected onto the surface of the photosensitive element. The photosensitive element converts the optical image into an electrical signal to obtain an analog image signal, and transmits the converted analog image signal to the analog-to-digital converter 1002, which converts it into a digital image signal for the image processor 1003. The image processor 1003 can display the digital image signal as an image or video through a display screen or monitor. Alternatively, the image processor 1003 can process the digital image signal before transmitting it to the memory 1004, so that the image can be retrieved from the memory and displayed on the display screen at any time when it is needed to view the image later.

[0057] As camera capabilities advance, camera module structures become increasingly complex, leading to greater space requirements. For example, the increased number and size of lenses necessitate larger placement spaces for the camera module. Furthermore, the use of large-area image sensors in camera modules necessitates a longer back focal length. The back focal length refers to the distance between the optical lens 101 and the image sensor; a longer back focal length results in a larger footprint and increased placement complexity. This is particularly problematic in portable devices such as smartphones or tablets, where large back focal lengths make it difficult to adapt to the trend towards thinner and more compact designs.

[0058] Based on this, embodiments of the present invention provide a camera module 1001, which includes a driving device 100. The driving device 100 drives an optical lens 101 to move along the optical axis direction to change the arrangement position of the optical lens 101. For example, the camera module 1001 is applied to a terminal (e.g., a mobile phone or tablet). The light-incident end of the optical lens 101 is typically arranged facing the back panel or display panel of the terminal, thus the optical axis direction of the optical lens 101 is the thickness direction of the terminal. By driving the optical lens 101 to move along the thickness direction of the terminal, the driving device 100 allows the camera module 1001 to have multiple positional states relative to the terminal. When the optical lens 101 moves towards the interior of the terminal along the thickness direction, the optical lens 101 can be housed within the terminal, thereby reducing the height of the optical lens 101 protruding from the back panel 1005 of the terminal. When the optical lens 101 moves outward along the thickness direction of the terminal, the distance between the optical lens 101 and the photosensitive element inside the terminal increases. In other words, the back focal length of the camera module 1001 increases, which can improve the shooting effect of the camera module 1001.

[0059] For example, the camera module 1001 has a stored state and a used state. When the camera module 1001 is in the stored state, the optical lens 101 is disposed close to the interior of the terminal in the thickness direction. At this time, the distance between the optical lens 101 and the photosensitive element inside the terminal is small, which allows the optical lens 101 to be located as close to the terminal as possible, reducing the height of the optical lens 101 protruding from the back panel 1005 of the terminal, and facilitating the thin design of the terminal in which the camera module 1001 is arranged.

[0060] The driving device 100 can drive the optical lens 101 to move outward along the thickness direction, switching the camera module 1001 to the usage state. In the usage state, the optical lens 101 has a large back focal length, resulting in better image quality and improving the system's shooting effect. Especially in application scenarios where the camera module 1001 uses a large-area photosensitive element, the camera module 1001 needs a large back focal length to achieve clear imaging. In this embodiment of the invention, the camera module 1001, in the usage state, drives the optical lens 101 outward through the driving device 100, enabling the camera module 1001 to meet the back focal length requirement and achieve clear imaging, thus satisfying the imaging needs. When the user does not use the camera module 1001, the driving device 100 drives the optical lens 101 to move inward into the terminal, allowing the optical lens 101 to be at least partially housed within the terminal, reducing the terminal's thickness and achieving a thinner design. Therefore, the camera module 1001 in this embodiment can achieve a balance between camera requirements and the thin design of the terminal, thereby improving the user experience.

[0061] In some embodiments, the lens Deco is connected to the optical lens 101. The driving device 100 simultaneously drives the optical lens 101 and the lens Deco to move along the thickness direction of the terminal. The lens Deco follows the optical lens 101 as it moves toward the interior of the terminal, which reduces the height of the lens Deco protruding from the back plate 1005. Furthermore, the lens Deco moves with the optical lens 101 and always covers the light-emitting side of the optical lens 101 to ensure the structural stability of the optical lens 101.

[0062] Commonly used drive devices 100 in the industry, such as linear motors and rotary motors, are usually large in size, making them difficult to arrange flexibly within a terminal. Especially in portable terminals (such as mobile phones or tablets), where space is very limited, the introduction of drive devices 100 can easily cause positional interference with other structures, making the terminal's structural design complex and difficult.

[0063] In view of this, as shown in FIG3, the present invention provides a driving device 100, the driving device 100 including a base 11, a rotating sleeve 12, a moving carrier 13 and a piezoelectric motor 14. The rotating sleeve 12 is rotatably connected to the base 11 about a first axis in a first direction (refer to the direction shown by arrow FF in FIG3). The first axis is referred to as the axis shown by line a in FIG3. The moving carrier 13 is movably installed in the rotating sleeve 12 along the first direction. One of the rotating sleeve 12 and the moving carrier 13 is formed as a guide groove 121, and the other of the rotating sleeve 12 and the moving carrier 13 is formed as a sliding part 131, which slides in cooperation with the guide groove 121. The piezoelectric motor 14 and the rotating sleeve 12 are arranged adjacent to each other in a second direction perpendicular to the first direction (refer to the direction shown by arrow SS in Figure 3). The piezoelectric motor 14 is used to drive the rotating sleeve 12 to rotate around the first axis. During the process of the piezoelectric motor 14 driving the rotating sleeve 12 to rotate around the first axis, the rotating sleeve 12 drives the moving carrier 13 to move in the first direction through the guide groove 121 and the sliding part 131.

[0064] It should be noted that the piezoelectric motor 14 refers to an electric motor that converts electrical energy into mechanical energy using the inverse piezoelectric effect of piezoelectric materials. The piezoelectric motor 14 typically includes a vibrating element 141, which is connected to a drive circuit. Under voltage, the vibrating element 141 vibrates to drive the moving element 142 to rotate or move linearly. Because it lacks the windings, magnets, and other structures found in traditional electric motors, the piezoelectric motor 14 has advantages such as small size, fast response speed, and low noise. Furthermore, the piezoelectric motor 14 does not generate electromagnetic radiation during operation and is unaffected by surrounding electromagnetic fields, thus exhibiting excellent electromagnetic interference resistance.

[0065] In the above embodiment, the piezoelectric motor 14 drives the rotating sleeve 12 to rotate around the first axis. During the rotation of the rotating sleeve 12 around the first axis, the rotating sleeve 12 drives the moving carrier 13 to move in the first direction through the guide groove 121 and the sliding part 131. In this way, the rotational torque output by the piezoelectric motor 14 can be converted into an axial driving force to drive the moving carrier 13 to move along the first direction through the rotating sleeve 12, thereby realizing the conversion of the motion trajectory. Furthermore, the piezoelectric motor 14 drives the moving carrier 13 to move along the first direction from the outer part of the rotating sleeve 12. The piezoelectric motor 14 and the rotating sleeve 12 are arranged adjacent to each other in a second direction perpendicular to the first direction, making the arrangement of the piezoelectric motor 14 more flexible. This arrangement can avoid the piezoelectric motor 14 occupying space in the first direction, reduce the overall size of the drive device 100 in the first direction, and make the structure of the drive device 100 more compact, which is more conducive to its arrangement in a thin terminal.

[0066] As an exemplary application scenario, the driving device 100 in the above embodiment is applied to the camera module 1001. The moving carrier 13 of the driving device 100 is connected to the optical lens 101. For example, the moving carrier 13 and the optical lens 101 are directly connected, or the moving carrier 13 and the optical lens 101 are indirectly connected through an intermediate component. The moving carrier 13 moves along the first direction while driving the optical lens 101 to move along the first direction, which is the thickness direction of the terminal. Taking the application scenario where the terminal is a mobile phone as an example, the base 11 of the driving device 100 is fixed inside the terminal (e.g., the base 11 is fixed to the circuit board), the optical lens 101 is fixedly connected to the moving carrier 13, and the piezoelectric motor 14 and the rotating sleeve 12 are arranged adjacent to each other in the second direction. The piezoelectric motor 14 does not need to occupy the space of the terminal in the first direction (i.e., the thickness direction of the mobile phone), which can reduce the size of the driving device 100 in the thickness direction and facilitate the thin design of the mobile phone. Since the camera module, image processor and central chip in the terminal are usually set on the same circuit board, and the optical lens 101 is located above the circuit board and is set in correspondence with the photosensitive element, by setting the piezoelectric motor 14 on the side of the optical lens 101 in the second direction, it is possible to avoid positional interference between the piezoelectric motor 14 and other structures on the circuit board (such as the image processor and central chip), thereby reducing the design difficulty of the internal space of the mobile phone.

[0067] In some embodiments, the photosensitive element of the camera module 1001 is fixed on the base 11. In other embodiments, the photosensitive element and the base 11 are respectively fixed on a circuit board inside the terminal. For example, the base 11 is formed as a ring, with space reserved inside corresponding to the optical lens 101 for mounting the photosensitive element.

[0068] In some embodiments, the movable carrier 13 and the optical lens 101 are fixedly connected by means of bonding, welding, or snap-fitting. For example, the movable carrier 13 is formed as a ring structure, and the movable carrier 13 is circumferentially fixedly connected to the optical lens 101. Alternatively, the movable carrier 13 and the bracket of the optical lens 101 (the optical lens element is fixed inside the bracket) are integrated into one unit. Or, the movable carrier 13 and the optical lens 101 are indirectly connected through a connecting structure. The present invention does not impose specific limitations.

[0069] For example, the camera module 1001 in the above embodiment has a first state and a second state. In the first state, the distance between the optical lens 101 and the base 11 is a first distance. In the second state, the distance between the optical lens 101 and the base 11 is a second distance, and the second distance is greater than the first distance. In this embodiment, the distance between the optical lens 101 and the base 11 is different in the first state and the second state, so that the optical lens 101 is in different positions relative to the terminal, and the camera module 1001 has different back focal distances.

[0070] In some application scenarios, the camera module 1001 has a first focusing state in the first state and a second focusing state in the second state, with different back focal distances. The moving carrier 13 of the driving device 100 drives the optical lens 101 to move along the first direction, so that the distance between the optical lens 101 and the photosensitive element changes. The camera module 1001 has different back focal distances and can achieve zoom.

[0071] In other application scenarios, the first state of the camera module 1001 is the aforementioned stowed state, where there is a small first distance between the optical lens 101 and the base 11. This results in a more compact structure for the camera module 1001, facilitating its placement within the terminal and reducing the height of the optical lens 101 protruding from the phone's back panel 1005, thus achieving a thinner phone design. When the camera module 1001 switches to its second state, the aforementioned usage state, there is a larger second distance between the optical lens 101 and the base 11. This allows the camera module 1001 to have a longer back focal length, meeting higher shooting requirements and facilitating the acquisition of images with good imaging quality.

[0072] It is understood that the guide groove 121 refers to an inclined groove structure. Specifically, the guide groove 121 extends from the first end to the second end, and the second end and the first end are staggered in the first direction. In this way, when the sliding part 131 moves from the first end to the second end of the guide groove 121, the sliding part 131 and the guide groove 121 are pressed against each other in the first direction and subjected to force. The moving carrier 13 is set to be movable in the first direction. Thus, the force between the sliding part 131 and the guide groove 121 is transmitted to the moving carrier 13, thereby driving the moving carrier 13 to move in the first direction.

[0073] It should be noted that the guide groove 121 can be formed as a through groove, that is, the guide groove 121 is open at both ends in the thickness direction of the structure. For example, the guide groove 121 is formed as a through groove penetrating the radial thickness of the rotating sleeve 12. Alternatively, the guide groove 121 can be formed as a one-way opening groove, that is, the guide groove 121 has an opening only in one direction. For example, the guide groove 121 is formed as a one-way opening groove on the inner circumferential surface of the rotating sleeve 12, and this one-way opening groove has an opening towards the moving carrier 13 to cooperate with the sliding part 131 on the moving carrier 13.

[0074] For example, as shown in FIG3, the guide groove 121 is formed on the rotating sleeve 12, and the sliding portion 131 is formed on the moving carrier 13. In this embodiment, the rotating sleeve 12 rotates around the first axis under the drive of the piezoelectric motor 14, and the guide groove 121 on the rotating sleeve 12 slides with the sliding portion 131. The guide groove 121 contacts the sliding portion 131 at different positions in the first direction, and the moving carrier 13 is movably installed in the rotating sleeve 12 along the first direction. In this way, the guide groove 121 provides a driving force in the first direction to the sliding portion 131, which can drive the moving carrier 13 to move in the first direction.

[0075] In some embodiments, the guide groove 121 is formed as a through groove, and the sliding part 131 is formed as a slider, such as a cam slider. In this embodiment, the guide groove 121 is formed as a through groove, that is, the guide groove 121 has two side walls arranged opposite to each other in the first direction. In this way, the slider is located between the two side walls, and when the rotating sleeve 12 rotates in two directions, the two side walls can respectively apply a driving force to the slider, thereby realizing the movement of the moving carrier 13 towards or away from the base 11 in the first direction.

[0076] In other embodiments, the guide groove 121 is formed as a threaded groove, and the sliding part 131 is formed as an external thread that engages with the threaded groove; however, this invention will not elaborate further.

[0077] In some embodiments, as shown in FIG4, at least two guide grooves 121 are formed on the circumferential surface of the rotating sleeve 12, which are evenly spaced along the circumferential direction. At least two sliding parts 131 are formed on the moving carrier 13, which cooperate with the at least two guide grooves 121. The rotating sleeve 12 can provide driving force to the moving carrier 13 from different positions, reduce the force between each guide groove 121 and the sliding part 131, and improve transmission stability and transmission efficiency.

[0078] The mobile carrier 13 is movably mounted in the rotating sleeve 12 along a first direction. For example, the drive device 100 includes a guide structure. The mobile carrier 13 is mounted on the base 11 or the terminal (e.g., the back plate of the terminal) through the guide structure. In this way, the guide structure can restrict the movement of the mobile carrier 13 so that the mobile carrier 13 can only move in the first direction.

[0079] In some embodiments, the guide structure is a guide rod 17 extending along a first direction, as shown in FIG5. FIG5 shows a partial cross-sectional view of a camera module 1001 provided in one embodiment, wherein a hole structure extending along the first direction is formed on the moving carrier 13, and the moving carrier 13 slides with the guide rod 17 through the hole structure, so that the moving carrier 13 can only move along the extension direction of the guide rod 17. In other embodiments, the moving carrier 13 cooperates with the guide rod 17 through a groove structure extending along the first direction. In this embodiment, the guide rod 17 is fixed to the base 11. Alternatively, the guide rod 17 is used to fix to the terminal. For example, the guide rod 17 is fixed to the inner surface of the back plate of the terminal by means of bonding or welding. In some embodiments, as shown in FIG7, there are multiple guide rods 17, and the multiple guide rods 17 are evenly spaced around a first axis.

[0080] In other embodiments, the guide structure includes a slider groove. For example, a groove extending in a first direction is formed on one of the base 11 and the moving carrier 13, and a slider is formed on the other of the base 11 and the moving carrier 13. The slider is slidably located in the groove, such that the base 11 and the moving carrier 13 can only move relative to each other in the first direction.

[0081] In some embodiments, the moving carrier 13 of the driving device 100 is connected to the optical lens 101 via an elastic buffer 18 to buffer external forces acting on the optical lens 101. As shown in FIG5, in this embodiment, the driving device 100 further includes an elastic buffer 18, which is supported between the moving carrier 13 and the optical lens 101. When the moving carrier 13 moves along a first direction, the movement of the moving carrier 13 causes the elastic buffer 18 to store force, thereby enabling the optical lens 101 to move via the elastic buffer 18. When the light-incident end of the optical lens 101 is located outside the back panel of the terminal, if the optical lens 101 is subjected to an external force (e.g., a user presses the lens deco outside the optical lens 101), the optical lens 101 and the lens deco press down on the elastic buffer 18 and move toward the inside of the terminal. The elastic buffer 18 can buffer the external force, reducing the probability of damage to the optical lens 101. When the external force is removed, the optical lens 101 and the lens deco can return to their original positions under the elastic force of the elastic buffer 18.

[0082] The rotating sleeve 12 is rotatably mounted on the base 11 around a first axis. Exemplarily, a rotational guide structure is provided between the rotating sleeve 12 and the base 11. For example, the rotating sleeve 12 and the base 11 are engaged by a circumferential sliding block to define the rotational trajectory of the rotating sleeve 12. Alternatively, in some embodiments, the drive device 100 includes a bearing 15, with the inner ring of the bearing 15 sleeved on the base 11, and the rotating sleeve 12 sleeved on the outer ring of the bearing 15. Exemplarily, referring to FIG10, the rotating sleeve 12 is sleeved on the outside of the bearing 15. The bearing 15 not only restricts the rotational trajectory of the rotating sleeve 12 but also reduces the frictional force experienced by the rotating sleeve 12 during rotation, thereby facilitating smooth and stable rotation of the rotating sleeve 12.

[0083] In some embodiments, referring to FIG4, a first magnetic part 111 is provided on the base 11 and a second magnetic part 127 is provided on the rotating sleeve 12. The first magnetic part 111 and the second magnetic part 127 repel each other. In this way, under the action of the mutual repulsive force, the friction between the base 11 and the rotating sleeve 12 is reduced, which can improve the transmission efficiency of the piezoelectric motor 14 driving the rotating sleeve 12 to rotate, and at the same time reduce the motion noise of the rotating sleeve 12.

[0084] In some embodiments, the projection of the second magnetic part 127 along the first direction is always located within the projection of the first magnetic part 111 along the first direction. In this way, during the rotation of the rotating sleeve 12, the base 11 and the rotating sleeve 12 can both be subjected to the mutual repulsive force generated by the first magnetic part 111 and the second magnetic part 127.

[0085] In some embodiments, the base 11 may be provided with a plurality of first magnetic parts 111 spaced apart along the circumference, and the rotating sleeve 12 may be provided with a plurality of second magnetic parts 127 corresponding to the plurality of first magnetic parts 111, so as to realize the mutual repulsion between the base 11 and the rotating sleeve 12 from multiple positions.

[0086] In some embodiments, referring to Figures 5 and 6, the drive device 100 includes balls 16, and a receiving groove 126 is formed on the end face of the base 11 facing the rotating sleeve 12, and / or a receiving groove 126 is formed on the end face of the rotating sleeve 12 facing the base 11. The balls 16 are located within the receiving grooves 126 and supported between the base 11 and the rotating sleeve 12. The balls 16 reduce the friction between the base 11 and the rotating sleeve 12, thereby improving the transmission efficiency of the piezoelectric motor 14 driving the rotating sleeve 12 to rotate, and simultaneously reducing the motion noise of the rotating sleeve 12. For example, a first receiving groove 126 is formed on the end face of the base 11 facing the rotating sleeve 12, and a second receiving groove 126 is formed on the end face of the rotating sleeve 12 facing the base 11. The balls 16 are located in the receiving space formed by the first and second receiving grooves 126. In some embodiments, the drive device 100 includes a plurality of balls 16, which are evenly spaced around a first axis.

[0087] The piezoelectric motor 14 comes in various types. Based on the vibration waveform generated by the vibrating element 141, the piezoelectric motor 14 can be divided into traveling wave type piezoelectric motors and standing wave type piezoelectric motors. A traveling wave type piezoelectric motor refers to a piezoelectric motor 14 in which the vibrating element 141 generates a traveling wave that propagates in a specific direction to drive the moving element 142. Traveling wave type piezoelectric motors have good positioning and speed control accuracy. A standing wave type piezoelectric motor, on the other hand, refers to a piezoelectric motor 14 in which the vibrating element 141 generates a standing wave that remains stationary to drive the moving element 142.

[0088] Taking a traveling wave type piezoelectric motor 14 as an example, the vibrating element 141 and the moving element 142 are stacked in the thickness direction. The vibrating element 141 deforms in the thickness direction and drives the moving element 142 to rotate around the second axis (refer to the axis shown by line b in FIG8). In some embodiments, the vibrating element 141 of the piezoelectric motor 14 is a piezoelectric ceramic sheet 1411. After being excited by voltage, the piezoelectric ceramic sheet 1411 generates a circumferentially advancing traveling wave. The surface in contact between the piezoelectric ceramic sheet 1411 and the moving element 142 provides a circumferential rotational torque to the moving element 142, thereby driving the moving element 142 to rotate around the axis. The moving element 142 outputs rotational torque outward through, for example, an output shaft or an output gear 143. For example, as shown in FIG8, the piezoelectric motor 14 is a ring traveling wave type piezoelectric motor, that is, the vibrating element 141 of the piezoelectric motor 14 is a ring vibrating element, and the moving element 142 is formed as a ring moving element.

[0089] In some embodiments, a friction plate 1421 is provided between the vibrating member 141 and the moving member 142 to increase the driving force of the vibrating member 141 on the moving member 142.

[0090] In some embodiments, the vibrating element 141 includes multiple layers of piezoelectric ceramic sheets 1411 stacked along the thickness direction, which are connected in parallel to each other for connecting to a drive circuit. It should be noted that the parallel connection of the multiple piezoelectric ceramic sheets 1411 refers to their electrical connection relative to the drive circuit. The multiple piezoelectric ceramic sheets 1411 can be connected to the same drive power supply via the drive circuit, so that terminals on the same side of the multiple piezoelectric ceramic sheets 1411 are connected to the same pole of the same drive power supply, and the current output by the drive power supply is distributed through each piezoelectric ceramic sheet 1411. Alternatively, the multiple piezoelectric ceramic sheets 1411 can be connected to different drive power supplies via the drive circuit, with each drive power supply providing current to a different piezoelectric ceramic sheet 1411.

[0091] Compared to a single piezoelectric ceramic sheet, the multilayer piezoelectric ceramic sheets 1411 in this embodiment are stacked along the thickness direction and connected in parallel to each other in the driving circuit. This allows each of the multilayer piezoelectric ceramic sheets 1411 to deform and drive the moving part 142 to rotate under a relatively small driving voltage, making it suitable for low-driving-voltage operating environments. For example, the driving device 100 is applied to a mobile phone, and the driving voltage of the piezoelectric motor 14 is less than or equal to 12V to meet the voltage limitations of the mobile phone.

[0092] In the above embodiment, the piezoelectric motor 14 outputs rotational torque. The output shaft of the piezoelectric motor 14 can drive the rotating sleeve 12 to rotate via gear transmission, rack and pinion transmission, or other means. For example, the moving part 142 includes an output gear 143, and the outer periphery of the rotating sleeve 12 is formed as a meshing part 122. The output gear 143 of the piezoelectric motor 14 engages with the meshing part 122 of the rotating sleeve 12.

[0093] As shown in Figure 8, for example, the output gear 143 is coaxially arranged with the moving part 142. The vibrating element 141 drives the moving part 142 to rotate circumferentially. The moving part 142 drives the output gear 143 to rotate via the central shaft. The output gear 143 engages with the meshing part 122, thereby driving the rotating sleeve 12 to rotate around the first axis. Since the meshing transmission has stable and good transmission efficiency and high transmission accuracy, the piezoelectric motor 14 in this embodiment can accurately and stably drive the rotating sleeve 12 to rotate.

[0094] In the above embodiments, the output gear 143 of the piezoelectric motor 14 rotates around a second axis parallel to the first axis. Thus, the output gear 143 and the meshing portion 122 are arranged and mesh with each other in the second direction. In other embodiments, as shown in FIG3, the output gear 143 is a bevel gear, the meshing portion 122 is a conical meshing portion 122, and the second axis is perpendicular to the first axis. Thus, the output gear 143 and the meshing portion 122 can form a bevel gear pair, which facilitates the arrangement of the piezoelectric motor 14 on the side of the rotating sleeve 12. Furthermore, in this embodiment, the piezoelectric motor 14 and the rotating sleeve 12 can be arranged close to each other, making the drive device 100 more compact and occupying less space.

[0095] As shown in Figures 9 and 10, in an embodiment where the piezoelectric motor 14 is a standing wave type piezoelectric motor, the rotating sleeve 12 includes a friction part 123, and the piezoelectric motor 14 includes a preload structure 144. The preload structure 144 provides an elastic force that causes the vibrating element 141 to abut against the friction part 123 of the rotating sleeve 12, so that when the vibrating element vibrates, it drives the rotating sleeve 12 to rotate around a first axis through the friction part 123. In this embodiment, the preload structure 144 can be a spring or a spring sheet structure. One end of the preload structure 144 abuts against the housing or other fixed structure of the piezoelectric motor 14, and the other end of the preload structure 144 abuts against the vibrating element 141. In this way, during the deformation process of the vibrating element 141 under voltage excitation, it continuously abuts against and moves away from the friction part 123 of the rotating sleeve 12, thereby continuously applying a driving force to the rotating sleeve 12.

[0096] For example, the friction portion 123 is a region on the outer peripheral surface of the rotating sleeve 12. The friction portion 123 can be made by surface roughening treatment or by spraying a material with a high coefficient of friction. Alternatively, in some embodiments, the rotating sleeve 12 includes a rotating ring 124 and a driven ring 125 arranged sequentially along a first direction. The outer peripheral surface of the rotating ring 124 forms the friction portion 123, and the driven ring 125 has a guide groove 121 formed on it. The rotating ring 124 and the driven ring 125 are fixedly connected. In the above embodiments, the rotating ring 124 and the driven ring 125 are formed separately, so that the rotating ring 124 and the driven ring 125 can be formed using different materials or processing methods to facilitate processing.

[0097] For example, the rotating ring 124 and the driven ring 125 can be made of different materials. For instance, the rotating ring 124 can be made of stainless steel to provide good hardness and improve its service life. The outer surface of the rotating ring 124 can be roughened or plated to obtain a surface with a high coefficient of friction. Alternatively, the driven ring 125 can be made of plastic. In embodiments where the driven ring 125 is made of plastic, the driven ring 125 has a smaller mass, higher transmission efficiency, and lower transmission noise during its interaction with the moving carrier 13 and transmission of driving force to the moving carrier 13. In other embodiments, the rotating ring 124 and the driven ring 125 can also be made of the same material.

[0098] For example, the rotating ring 124 and the driven ring 125 are fixedly connected by means of bonding or welding.

[0099] The above are merely some embodiments and implementations of the present invention, and the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A driving device (100), characterized in that, include: Base (11); Rotate the sleeve (12), which is rotatably connected to the base (11) about a first axis in a first direction; A mobile carrier (13) is movably installed in the rotating sleeve (12) along the first direction. One of the rotating sleeve (12) and the mobile carrier (13) is provided with a guide groove (121), and the other of the rotating sleeve (12) and the mobile carrier (13) is provided with a sliding part (131). The sliding part (131) is slidably engaged with the guide groove (121). A piezoelectric motor (14) is arranged adjacent to the rotating sleeve (12) in a second direction perpendicular to the first direction. The piezoelectric motor (14) is used to drive the rotating sleeve (12) to rotate around the first axis, so that the rotating sleeve (12) drives the moving carrier (13) to move along the first direction through the guide groove (121) and the sliding part (131).

2. The driving device (100) according to claim 1, characterized in that, The piezoelectric motor (14) includes a vibrating element (141) and a moving element (142). The vibrating element (141) and the moving element (142) are stacked along the thickness direction. The vibrating element (141) deforms in the thickness direction and drives the moving element (142) to rotate around a second axis. The second axis has an angle with the first axis. The moving part (142) includes an output gear (143), and the outer periphery of the rotating sleeve (12) is formed with a meshing part (122), and the output gear (143) engages with the meshing part (122) in a transmission.

3. The driving device (100) according to claim 2, characterized in that, The output gear (143) is a bevel gear, and the meshing part (122) is a bevel meshing part.

4. The driving device (100) according to claim 1, characterized in that, The piezoelectric motor (14) includes a vibrating element (141) and a preload structure (144). The outer peripheral surface of the rotating sleeve (12) is provided with a friction part (123). The preload structure (144) provides an elastic force that causes the vibrating element (141) to abut against the friction part (123) of the rotating sleeve (12), so that when the vibrating element (141) vibrates, it drives the rotating sleeve (12) to rotate around the first axis through the friction part (123).

5. The driving device (100) according to claim 4, characterized in that, The rotating sleeve (12) includes a rotating ring (124) and a driven ring (125). The rotating ring (124) and the driven ring (125) are arranged and connected in sequence along a first direction. The outer peripheral surface of the rotating ring (124) is formed with the friction part (123), and the driven ring (125) is formed with the guide groove (121).

6. The drive device (100) according to any one of claims 2-5, characterized in that, The vibrating element (141) includes multiple layers of piezoelectric ceramic sheets (1411) stacked along the thickness direction, and the multiple layers of piezoelectric ceramic sheets (1411) are connected in parallel to each other to be connected to the driving circuit.

7. The drive device (100) according to any one of claims 1-6, characterized in that, The drive device (100) includes a bearing (15), the inner ring of which is sleeved on the base (11), and the rotating sleeve (12) is sleeved on the outer ring of the bearing (15).

8. The drive device (100) according to any one of claims 1-7, characterized in that, The base (11) has a receiving groove (126) formed on the end face of the rotating sleeve (12) facing the base (11), and / or the rotating sleeve (12) has a receiving groove (126) formed on the end face of the base (11). The drive device (100) includes a ball (16) located in the receiving groove (126) and supported between the base (11) and the rotating sleeve (12).

9. The drive device (100) according to any one of claims 1-8, characterized in that, The base (11) is provided with a first magnetic part (111), and the rotating sleeve (12) is provided with a second magnetic part (127). The first magnetic part (111) and the second magnetic part (127) have repulsive magnetism.

10. The driving device (100) according to any one of claims 1-9, characterized in that, The drive device (100) further includes an elastic buffer (18), one end of which is connected to the moving carrier (13), and the other end of which is used to connect to the optical lens (101).

11. The drive device (100) according to any one of claims 1-10, characterized in that, The drive device (100) includes a guide rod (17) extending along the first direction, and the moving carrier (13) is slidably engaged with the guide rod (17) through a groove structure or a hole structure; The guide rod (17) is fixedly connected to the base (11), or the guide rod (17) is used to be fixedly connected to the terminal (1000).

12. A camera module, characterized in that, The camera module (1001) includes an optical lens (101), a photosensitive element, and a driving device (100) as described in any one of claims 1-11, wherein the photosensitive element is located on the image side of the optical lens (101), and the moving carrier (13) of the driving device (100) is connected to the optical lens (101) so that the camera module (1001) has a first state and a second state. In the first state, the distance between the optical lens (101) and the base (11) is a first distance; In the second state, the distance between the optical lens (101) and the base (11) is a second distance, which is greater than the first distance.

13. A terminal (1000), characterized in that, The system includes an image processor (1003) and a camera module (1001) as described in claim 12, wherein the image processor (1003) is communicatively connected to the camera module (1001), the camera module (1001) is used to acquire image data and input the image data into the image processor (1003), and the image processor (1003) is used to process the image data.

Images