A camera module and a terminal device

Abstract

The application provides a camera module and a terminal device. The camera module comprises a base, a first lens carrier connected to the base in a sliding manner, a first lens and a second lens having the same optical axis, the first lens being fixed to the base, and the second lens being mounted on the first lens carrier, and a piezoelectric driving assembly fixed to the base and located between the base and the first lens carrier. The piezoelectric driving assembly comprises a first piezoelectric motor, the first piezoelectric motor comprising a driving component, a deformation component and a friction head. The driving component is electrically connected to the deformation component and provides an electric signal to the deformation component. The deformation component is fixed to the friction head. The deformation component drives the friction head to move along the optical axis direction after receiving the electric signal. The friction head contacts and drives the first lens carrier to move along the optical axis direction in the movement process, thereby driving the second lens to move along the optical axis direction relative to the base to realize continuous zooming. The application is beneficial to avoiding zooming failure caused by heating, improving the image performance of the camera module, facilitating miniaturization, and reducing shaking and abnormal sound.

Description

Technical Field

[0001] This utility model belongs to the field of optical imaging, and in particular relates to a camera module and terminal device. Background Technology

[0002] With the rapid development of various terminal devices, users' demands for their photography and video recording performance are constantly increasing. Many scenarios require camera modules with zoom capabilities to capture clear images of subjects at different distances through optical zoom, achieving optimal photo results. Camera modules with continuous zoom functionality are an emerging industry. The basic principle of a continuous zoom mechanism is to change the combined focal length of the system by moving two or more optical lens groups within the optical system. However, adjusting the focal length can lead to blurry images and issues such as shaking and rattling, requiring readjustment of image sharpness. This results in poor image adjustment efficiency and a poor user experience. Therefore, designing a camera module structure that can simultaneously achieve miniaturization, avoid shaking and rattling, and maintain good image quality throughout the zoom process remains a subject of ongoing exploration in the industry. Utility Model Content

[0003] The purpose of this invention is to provide a camera module and terminal device that can simultaneously achieve miniaturization, avoid shaking and abnormal noise, and maintain good image quality throughout the zoom process.

[0004] To achieve the objectives of this utility model, the following technical solution is provided:

[0005] In a first aspect, this application provides a camera module, which includes a base; a first lens mount slidably connected to the base; a first lens and a second lens, the first lens and the second lens having the same optical axis, the first lens being fixedly disposed on the base, and the second lens being mounted on the first lens mount; and a piezoelectric drive assembly, fixedly disposed on the base and located between the base and the first lens mount, the piezoelectric drive assembly including a first piezoelectric motor, the first piezoelectric motor including a drive component, a deformation component and a friction head, the drive component being electrically connected to the deformation component and providing an electrical signal to the deformation component, the deformation component being fixedly connected to the friction head, the deformation component receiving the electrical signal and driving the friction head to move along the optical axis, the friction head contacting and actuating the first lens mount to move along the optical axis during the movement, thereby driving the second lens to move relative to the base along the optical axis to achieve continuous zoom. Therefore, on the one hand, the piezoelectric drive element uses static friction to move the lens in a step-by-step manner, which helps to avoid zoom failure due to heat generation of the piezoelectric drive element and makes the image performance of the camera module more stable; on the other hand, the piezoelectric drive element is small in size and occupies less width of the camera module, which is conducive to the miniaturization of the camera module; furthermore, the piezoelectric drive element can provide a large driving force and can drive multiple lenses in the lens group at the same time, which helps to reduce the shaking and abnormal noise of the camera module.

[0006] In one possible implementation, the camera module further includes: a third lens and a second lens mount. The third lens shares the same optical axis as the first lens and the second lens, and the first lens, the second lens, and the third lens are arranged sequentially. The second lens mount is disposed on the image side of the camera module, and the third lens is mounted on the second lens mount. The piezoelectric drive assembly further includes a second piezoelectric motor, which includes a drive component, a deformation component, and a friction head. The drive component is electrically connected to the deformation component and provides an electrical signal to the deformation component. The deformation component is fixedly connected to the friction head. After receiving the electrical signal, the deformation component drives the friction head to move along the optical axis. During the movement, the friction head contacts and actuates the second lens mount to move along the optical axis, thereby driving the third lens to move relative to the base along the optical axis to achieve continuous zoom. Thus, by adjusting the relative position of the first lens mount along the optical axis, zooming of the camera module can be achieved; by adjusting the relative position of the second lens mount along the optical axis, the image effect of the camera module can be adjusted.

[0007] In one possible implementation, the first piezoelectric motor and the second piezoelectric motor are disposed on the same side of the base, and are arranged side-by-side along the optical axis. The camera module further includes a first guide rod extending along the optical axis. The first lens mount and the second lens mount are slidably connected to the first guide rod. A plurality of ball bearings are respectively disposed between the side of the first lens mount and the base away from the first guide rod, and the first lens mount and the second lens mount are connected to the base via the ball bearings. Thus, on the one hand, the dual piezoelectric motor configuration provides sufficient driving force for large-stroke zoom; on the other hand, the first lens mount and the second lens mount sharing the first guide rod and multiple ball bearings minimizes the number of tolerance chains, reducing the difference in their optical axes and improving the zoom stability of the camera module.

[0008] In one possible implementation, the first piezoelectric motor and the second piezoelectric motor are disposed on opposite sides of the base; the camera module further includes a first guide rod and a second guide rod, the first guide rod and the second guide rod being parallel and both extending along the optical axis, and the first guide rod and the second guide rod being located at the radial ends of the first lens mount and the second lens mount, respectively. The first lens mount and the second lens mount are both slidably connected to the first guide rod, and the first lens mount and the second lens mount are both slidably connected to the second guide rod. Thus, the relative positions of the first lens mount and the second lens mount in the optical axis direction can be adjusted via the first guide rod and the second guide rod, which is beneficial for improving the zoom stability of the camera module.

[0009] In one possible implementation, along the plane of the side plate of the base, the projection of the first piezoelectric motor at least partially coincides with the projection of the second mirror; or, the projection of the second piezoelectric motor at least partially coincides with the projection of the first mirror. Taking the second piezoelectric motor as an example, the second piezoelectric motor is fixed to one radial side of the second mirror, and at least a portion of the second piezoelectric motor extends along the optical axis to one radial side of the first mirror. The first mirror can be Z-shaped offset from the second mirror, thereby shortening the length occupied by the second piezoelectric motor along the optical axis. This is beneficial for shortening the length of the camera module along the optical axis, and for miniaturizing the camera module.

[0010] In one possible implementation, the first piezoelectric motor further includes a frame, a first fixing member, and a second fixing member. The first fixing member and the second fixing member are respectively fixed to the frame, and the first fixing member and the second fixing member are arranged opposite each other with a mounting space between them. The deformation component is mounted in the mounting space and abuts against the first fixing member and the second fixing member respectively. Thus, except for the end fixed to the friction head, the remaining end faces of the deformation component are directly or indirectly fixed to the frame. This facilitates the concentrated transfer of energy to the friction head when the deformation component generates high-frequency vibration, and ensures the structural stability of the piezoelectric drive assembly.

[0011] In one possible implementation, the first piezoelectric motor further includes elastic elements, which are respectively disposed between the first fixing member and the frame, and between the second fixing member and the frame. The elastic elements are configured in a pre-compressed state to provide pressure on the deformable component to the first and second fixing members. Thus, the elastic elements provide a set of opposing rebound forces along the optical axis, ensuring that vibration of the deformable component does not affect the structural stability of the frame, thereby contributing to maintaining the overall stability of the piezoelectric drive assembly.

[0012] In one possible implementation, the piezoelectric drive assembly has a magnetic conductor at one end near the base plate, and a magnet is embedded at the end of the first mirror mounted opposite the magnetic conductor. The magnet and the magnetic conductor are configured to have the same magnetic poles to provide a force on the first mirror mounted away from the magnetic conductor. This provides additional compressive force to the first mirror mounted and the piezoelectric drive assembly, thereby reducing the driving force required for the piezoelectric drive assembly to move the first mirror mounted.

[0013] In one possible implementation, a mounting groove is formed at one end of the side plate of the first lens mount near the base, such that the first lens mount has a main body and a protruding part. The piezoelectric drive assembly is embedded in the mounting groove, and along the radial direction of the second lens, the piezoelectric drive assembly at least partially coincides with the protruding part. Furthermore, the piezoelectric drive assembly is configured such that the friction head abuts against the protruding part, enabling the first piezoelectric motor to drive the protruding part to move along the optical axis. Thus, by continuously contacting and agitating the platform with the friction head, zooming of the camera module is facilitated.

[0014] Secondly, this utility model also provides a terminal device, including a device body and a camera module as described in any of the above embodiments, wherein the camera module is installed on the device body. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the terminal device provided in the embodiments of this application;

[0017] Figure 2 This is a schematic diagram of the appearance of the camera module provided in the embodiments of this application;

[0018] Figure 3 This is an exploded view of a camera module with the first and second piezoelectric motors located on the same side, as provided in an embodiment of this application.

[0019] Figure 4 This is an exploded view of a camera module with the first and second piezoelectric motors located on opposite sides, as provided in an embodiment of this application.

[0020] Figure 5 yes Figure 3 Top view of the base;

[0021] Figure 6 yes Figure 4 Left side view of the first piezoelectric motor in the image;

[0022] Figure 7 yes Figure 4 Right side view of the first piezoelectric motor in the image;

[0023] Figure 8 This is a schematic diagram of the motion trajectory of the friction head provided in the embodiments of this application;

[0024] Figure 9 yes Figure 4 A top view of the first piezoelectric motor in the image;

[0025] Figure 10 yes Figure 9 Cross-sectional view at point AA;

[0026] Figure 11 yes Figure 4 A schematic diagram of some parts of the first piezoelectric motor in the image;

[0027] Figure 12 This is a cross-sectional view of a camera module containing a magnetic conductor and a magnet in an embodiment of this application;

[0028] Figure 13 This is a schematic diagram of the structure of the camera module with dual guidance in the embodiments of this application;

[0029] Figure 14 yes Figure 4 A top view of the camera module.

[0030] Key reference numerals: Terminal device - 1000; Camera module - 1; Sealing structure - 2; Display screen - 3; Base plate - 110; First groove - 111; Side plate - 120; Fourth opening - 121; Fifth opening - 122; Position sensor - 1221; Front end face - 131; First opening - 1311; Rear end face - 132; Second opening - 1321; Accommodation space - 140; First guide rod - 151; Second guide rod -152; Ball bearing -153; Third guide rod -161; Fourth guide rod -162; Housing -20; First lens mount -30; Main body -301; Extension -302; First slide rail -311; Second slide rail -312; Bottom surface -320; Platform -350; First side surface -360; Second groove -361; Position detection component -370; Magnet -380; Mounting slot -390; Second lens mount -40; First lens -G 1; Second lens - G2; Third lens - G3; Piezoelectric drive element - 50; Drive component 510; First circuit board - 511; First end - 5111; Second end - 5112; Interface - 5113; Second circuit board - 512; Opening - 5121; Deformation component - 520; Second side surface - 521; First end face - 522; Second side surface - 523; Friction head - 530; Second end face - 541; Third end face - 5 42; Third groove - 5421; Groove bottom - 5422; Opening - 5423; Frame - 550; Fourth end face - 551; Magnetic conductor - 552; Installation space - 553; First fixing member - 560; Second fixing member - 570; First elastic member - 580; Fifth end face - 581; Sixth end face - 582; Arc surface - 538; Second elastic member - 590; First piezoelectric motor - 501; Second piezoelectric motor - 502. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It is understood that the terminology in the specification, claims, and accompanying drawings of this application is for describing specific embodiments only and is not intended to limit this application. The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Unless the context clearly states otherwise, the singular forms "a" and "described" are also intended to include the plural forms. The term "comprising," and any variations thereof, are intended to cover non-exclusive inclusion. Furthermore, this application can be implemented in many different forms and is not limited to the embodiments described herein. The purpose of providing the following specific embodiments is to facilitate a clearer and more thorough understanding of the disclosure of this application, wherein words indicating orientation such as up, down, left, and right refer only to the position of the illustrated structure in the corresponding drawings. In the description of this application, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set on" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection; it can refer to a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The following description provides preferred embodiments for carrying out this application; however, this description is for the purpose of illustrating the general principles of this application and is not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.

[0034] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the terminal device 1000 provided in this application embodiment. The terminal device 1000 may include, but is not limited to, devices with a camera module 1 such as mobile phones, tablet computers, digital cameras, and laptop computers. It is understood that, in order to enable those skilled in the art to better understand the terminal device 1000, this application uses a mobile phone as an example for detailed description. It should be noted that the use of a mobile phone as the terminal device 1000 is for illustrative purposes only, and this application does not impose any specific limitations. For example, the product type of the terminal device 1000 can also be set according to actual needs.

[0035] In this embodiment, the terminal device 1000 includes a camera module 1, a sealing structure 2, and a display screen 3. The display screen 3 is mounted on the front of the sealing structure 2, and the camera module 1 is mounted inside the sealing structure 2 and protrudes from the display screen 3. Specifically, the sealing structure 2 and the display screen 3 are sealed and fixedly connected to encapsulate the camera module 1. The camera module 1 is housed within the accommodating space formed by the sealing structure 2 and the display screen 3. The lens of the camera module 1 protrudes from the display screen 3 and serves as a front-facing camera. The camera module 1 can be located inside the terminal device 1000 and function as a camera. The camera module 1 is used to enable the terminal device 1000 to take photos or record videos. The camera module 1 has a stable and accurate zoom function, thereby ensuring the photo-taking performance of the terminal device 1000. Of course, in other embodiments, the camera module 1 is mounted inside the sealing structure 2 and protrudes from the back of the sealing structure 2, that is, the camera module 1 is positioned with its back to the display screen 3 and serves as a rear-facing camera.

[0036] In one possible implementation, the terminal device 1000 further includes a photosensitive chip disposed on the image-side surface of the camera module 1. The photosensitive chip is used to receive images from the camera module 1 and transmit them to the image processor of the terminal device 1000, thereby outputting a visual image.

[0037] Please see Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the appearance of the camera module 1 provided in the embodiments of this application. Figure 3 This is an exploded view of a camera module 1 with the first piezoelectric motor 501 and the second piezoelectric motor 502 located on the same side, as provided in an embodiment of this application. The camera module 1 includes a base 10 and a housing 20. The base 10 includes a bottom plate 110 and a pair of side plates 120. The bottom plate 110 is generally rectangular. The pair of side plates 120 are located at opposite edges of the bottom plate 110 along the X direction shown in the figure, and at opposite edges of the bottom plate 110 along the Y direction shown in the figure, forming a front end surface 131 and a rear end surface 132 of the base 10 between the pair of side plates 120. Both the front end surface 131 and the rear end surface 132 have openings. In one possible embodiment, the front end surface 131 is located on the object side of the camera module 1. The first opening 1311 of the front end surface 131 is used to mount the first lens G1, and the second opening 1321 of the rear end surface 132 is used to mount the photosensitive chip.

[0038] A pair of side plates 120 extend between the front end face 131 and the rear end face 132. The base plate 110 and the pair of side plates 120 together enclose and form a receiving space 140. The housing 20 is mounted on the base 10 along the Z direction shown in the figure, and the receiving space 140 is sealed at the top of the base 10. The receiving space 140 is used to accommodate other components such as the first mirror mount 30, the first lens G1, the second lens G2, and the piezoelectric drive assembly 50.

[0039] The first mirror mount 30 is slidably connected to the base 10. For example, the base 10 has a guide rod parallel to the optical axis O, and the first mirror mount 30 has a corresponding sliding groove. The cooperation between the guide rod and the sliding groove allows the first mirror mount 30 to move relative to the base 10 along the optical axis O. It is understood that the first mirror mount 30 and the base 10 can also be slidably connected in other ways.

[0040] The first lens G1 and the second lens G2 share the same optical axis O, and are used to transmit light. The first lens G1 is fixed to the base 10. It can be understood that the first lens G1 can be installed in the first opening 1311 on the front face 131 or in the second opening 1321 on the rear face 132, meaning the first lens G1 can be located on the object side or image side of the camera module 1. The second lens G2 is mounted on the first lens mount 30, and the mounting method includes, but is not limited to, adhesive and snap-fit ​​connections. Therefore, by adjusting the position of the first lens mount 30 relative to the base 10 along the optical axis O, zooming and focusing of the camera module 1 can be achieved, thereby adjusting the image effect of the camera module 1.

[0041] In one possible implementation, a cushioning material, such as foam, can be provided at the contact point between the first lens mount 30 and the first lens G1 to prevent the first lens G1 from shaking during use of the camera module 1. In another possible implementation, the surfaces where the first lens mount 30 and the first lens G1 are in contact can be made of soft rubber with elastic deformation capabilities, allowing for elastic contact between the first lens mount 30 and the first lens G1, preventing shaking and thus preventing the first lens G1 from shaking during use of the camera module 1.

[0042] Please see Figure 4 , Figure 6 and Figure 7 , Figure 4 This is an exploded view of the camera module 1, where the first piezoelectric motor 501 and the second piezoelectric motor 502 are located on opposite sides, according to an embodiment of this application. Figure 6 yes Figure 4 Left side view of the first piezoelectric motor 501 in the middle. Figure 7 yes Figure 4The image shows a right-side view of the first piezoelectric motor 501. The first piezoelectric motor 501 has two end faces arranged opposite each other along the optical axis O. The second end face 541 is fixedly connected to the side plate 120 of the base 10, and the third end face 542 is fixedly connected to the first mirror mount 30. That is, the first piezoelectric motor 501 is fixed between the base 10 and the first mirror mount 30 along the X-direction. The first piezoelectric motor 501 includes a drive component 510, a deformation component 520, and a friction head 530. The drive component 510 is electrically connected to one side of the deformation component 520 along the optical axis O, and the deformation component 520 is fixedly connected to the friction head 530 along the Z-direction. The fixing methods include, but are not limited to, adhesive bonding, welding, and snap-fit ​​connections. In one possible embodiment, the deformation component 520 and the friction head 530 can be integrally formed.

[0043] The driving component 510 provides an electrical signal to the deformation component 520. Upon receiving the electrical signal, the deformation component 520 drives the friction head 530 to move along the optical axis O. During this movement, the friction head 530 contacts and actuates the first lens mount 30 to move along the optical axis O, thereby driving the second lens G2 to move relative to the base 10 along the optical axis O to achieve continuous zoom. (See also...) Figure 8 Specifically, after receiving an electrical signal, the deformation component 520 vibrates along the YZ plane shown in the figure. The deformation component 520 drives the friction head 530 to move in an elliptical trajectory along the YZ plane shown in the figure. Whenever the friction head 530 moves to contact the platform 350 of the first mirror mount 30 away from the base plate 110 along the Z direction, it will generate a force on the platform 350 along the Y direction shown in the figure. This causes the friction head 530 to move the first mirror mount 30 by static friction, so as to guide at least the first mirror mount 30 to move in a stepwise manner relative to the base 10 along the optical axis O direction, thereby realizing the zoom function of the camera module 1.

[0044] In one possible implementation, the driving component 510 may apply a positive or negative voltage to the deformation component 520, so as to Figure 8 For example, Figure 8This is a schematic diagram of the motion trajectory of the friction head 530 provided in the embodiment of this application. When the driving component 510 applies a positive voltage to the deformation component 520, the deformation component 520 performs a creeping oscillation in the YZ plane, generating deformation, thereby driving the friction head 530 to move in an elliptical clockwise direction in the YZ plane. Each time the friction head 530 contacts the platform 350, it will move the first mirror 30 slightly in the opposite direction of Y. When a larger adjustment is needed to the relative position of the first mirror 30, the friction head 530 needs to contact and move the platform 350 multiple times. When the first mirror 30 is adjusted to the target position, the driving component 510 stops applying voltage to the deformation component 520, the deformation component 520 no longer vibrates, and the friction head 530 remains stationary. The friction head 530 may or may not contact the platform 350. Similarly, when the driving component 510 applies a negative voltage to the deformation component 520, the deformation component 520 wobble along the YZ plane, generating deformation, which in turn drives the friction head 530 to move in an elliptical shape counterclockwise along the YZ plane shown in the figure. Each time the friction head 530 contacts the platform 350, it will cause the first mirror 30 to make a small displacement along the positive Y direction.

[0045] In one possible implementation, the deformation component 520 includes quartz, piezoelectric ceramics, or polymeric piezoelectric materials. For example, the material of the deformation component 520 may be barium titanate piezoelectric ceramic (BaTiO3), lead zirconate titanate piezoelectric ceramic, etc. Piezoelectric ceramics have advantages such as acid and alkali resistance, high energy conversion efficiency, no electromagnetic interference, and simple structure. In another possible implementation, the friction head 530 is made of silicon nitride-based composite materials, stainless steel, polymeric materials, etc., and the material selection of the friction head 530 meets requirements such as high wear resistance, stable coefficient of friction, and excellent mechanical strength.

[0046] Therefore, on the one hand, the piezoelectric drive assembly 50 uses static friction to move the first mirror mount 30 in a step-by-step manner, which helps to prevent the piezoelectric drive assembly 50 from failing due to heat generation, making the image performance of the camera module 1 more stable; on the other hand, the piezoelectric drive assembly 50 is small in size and occupies a small width of the camera module 1 along the X direction shown in the figure, which is conducive to the miniaturization of the camera module 1; furthermore, the piezoelectric drive assembly 50 can provide a large driving force and can drive the first mirror mount 30 and the second mirror mount 40 at the same time, which helps to reduce the shaking noise of the camera module 1.

[0047] Please see Figure 3 and Figure 4In this embodiment, the camera module 1 further includes a third lens G3 and a second lens mount 40. The third lens G3, the first lens G1, and the second lens G2 share the same optical axis, and the first lens G1, the second lens G2, and the third lens G3 are arranged sequentially. The second lens mount 40 is disposed on the image side of the camera module 1, and the third lens G2 is mounted on the second lens mount 40. The piezoelectric drive assembly 50 further includes a second piezoelectric motor 502. The second piezoelectric motor 502 includes a drive component 510, a deformation component 520, and a friction head 530. The drive component 510 is electrically connected to the deformation component 520 and provides an electrical signal to the deformation component 520. The deformation component 520 is fixedly connected to the friction head 530. After receiving the electrical signal, the deformation component 520 drives the friction head 530 to move along the optical axis O. During the movement, the friction head 530 contacts and moves the second lens mount 40 along the optical axis O, thereby driving the third lens G3 to move relative to the base 10 along the optical axis O to achieve continuous zoom.

[0048] Along the optical axis O, the first lens G1, the second lens G2, and the third lens G3 are arranged sequentially, with the first lens G1 closer to the object side of the camera module 1 and the third lens G3 closer to the image side of the camera module 1. Therefore, by adjusting the relative position of the first lens mount 30 along the optical axis O, the camera module 1 can be zoomed; by adjusting the relative position of the second lens mount 40 along the optical axis O, the image quality of the camera module 1 can be adjusted.

[0049] In one possible implementation, the camera module 1 may include more lenses, such as 4, 5 or 6, etc. Except for the first lens G1, the other lenses may be mounted on a lens mount and are provided with a piezoelectric drive assembly 50 for driving the lenses.

[0050] Please see Figure 3 In this embodiment, the first piezoelectric motor 501 and the second piezoelectric motor 502 are disposed on the same side of the base 10, and the first piezoelectric motor 501 and the second piezoelectric motor 502 are arranged side by side along the optical axis O; the camera module 1 also includes a first guide rod 151, which extends along the optical axis O, and the first mirror mount 30 and the second mirror mount 40 are slidably connected to the first guide rod 151 respectively. A plurality of balls 153 are respectively disposed between the other side of the first mirror mount 30 and the second mirror mount 40 away from the first guide rod 151 and the base 10, and the first mirror mount 30 and the second mirror mount 40 are connected to the base 10 through the balls 153.

[0051] like Figure 3 As shown, the first piezoelectric motor 501 and the second piezoelectric motor 502 are integrated and disposed on one side of the base 10 along the X direction. In one possible embodiment, the first piezoelectric motor 501 and the second piezoelectric motor 502 may also be separate designs and disposed side by side along the optical axis O on one side of the base 10 along the X direction.

[0052] Please see Figure 3 and Figure 5 , Figure 5 yes Figure 3 A top view of the base 10. A first guide rod 151 is fixed to the base plate 110, connecting the front end face 131 and the rear end face 132 of the base 10. The first guide rod 151 can be integrally designed with the base plate 110 or a separate design. The base plate 110 of the base 10 has a first groove 111 for accommodating a ball bearing 153. The ball bearing 153 and the first guide rod 151 are located on opposite sides of the base plate 110 along the X-direction. In one possible embodiment, there are multiple first grooves 111, arranged sequentially along the optical axis O, each first groove 111 accommodating one or more ball bearings 153.

[0053] The first mirror mount 30 and the second mirror mount 40 are provided with sliding grooves that cooperate with the first guide rod 151 and a plurality of ball bearings 153, so that the first mirror mount 30 and the second mirror mount 40 are slidably connected with the first guide rod 151 and the plurality of ball bearings 153. Taking the first mirror mount 30 as an example, the first mirror mount 30 is provided with a first sliding groove 311 and a second sliding groove 312. The first sliding groove 311 and the second sliding groove 312 are both provided on the bottom surface 320 of the first mirror mount 30 near the base plate 110. The first sliding groove 311 and the second sliding groove 312 are located on opposite sides of the bottom surface 320 of the first mirror mount 30 along the X direction, and the first sliding groove 311 and the second sliding groove 312 extend along the optical axis O direction. Along the Z direction shown in the figure, the first groove 311 is disposed opposite to the first guide rod 151, and the first groove 311 is used to accommodate the first guide rod 151 and is slidably connected to the first guide rod 151; the second groove 312 is disposed opposite to a plurality of balls 153, and the second groove 312 is used to accommodate a plurality of balls 153 and is slidably connected to the plurality of balls 153. Similarly, the second mirror mount 40 is also provided with the same or similar grooves to be slidably connected to the first guide rod 151 and the plurality of balls 153. In one embodiment, the first groove 311 and the second groove 312 are trapezoidal grooves, and the sidewalls of the grooves and the bottom of the grooves form obtuse angles, which facilitates the sliding of the first mirror mount 30 along the optical axis O direction by the first guide rod 151 and the balls 153.

[0054] Thus, on the one hand, the dual piezoelectric motor configuration is beneficial for providing sufficient driving force for large-stroke zoom; on the other hand, the first lens mount 30 and the second lens mount 40 share the first guide rod 151 and multiple ball bearings 153, which can minimize the number of tolerance chains and reduce the difference in optical axes between the two, thereby improving the zoom stability of the camera module 1.

[0055] Please see Figure 4It is understood that the first piezoelectric motor 501 and the second piezoelectric motor 502 can also be disposed on opposite sides of the base 10; the camera module 1 also includes a first guide rod 151 and a second guide rod 152, the first guide rod 151 and the second guide rod 152 are parallel and both extend along the optical axis direction O, and the first guide rod 151 and the second guide rod 152 are respectively located at the radial ends of the first mirror mount 30 and the second mirror mount 40, the first mirror mount 30 and the second mirror mount 40 are both slidably connected to the first guide rod 151 and the first mirror mount 30 and the second mirror mount 40 are both slidably connected to the second guide rod 152.

[0056] like Figure 4 As shown, the first piezoelectric motor 501 is disposed on the side of the first mirror mount 30 along the X-direction, and the second piezoelectric motor 502 is disposed on the side of the second mirror mount 40 along the X-direction. Thus, the first piezoelectric motor 501 and the second piezoelectric motor 502 are disposed on opposite sides of the base 10 in the X-direction. The first mirror mount 30 and the second mirror mount 40 are slidably connected to the base 10 via the first guide rod 151 and the second guide rod 152. Specifically, both the first guide rod 151 and the second guide rod 152 are fixed to the base plate 110 and connected between the front end face 131 and the rear end face 132 of the base 10. The first guide rod 151 and the second guide rod 152 can be integrally designed with the base plate 110 or can be separate from the base plate 110. The first mirror mount 30 and the second mirror mount 40 are provided with sliding grooves that cooperate with the first guide rod 151 and the second guide rod 152, so that both the first mirror mount 30 and the second mirror mount 40 are slidably connected to the first guide rod 151 and the second guide rod 152. The sliding groove configuration can refer to the first sliding groove 311 and the second sliding groove 312 in the above embodiment.

[0057] Therefore, the relative positions of the first lens mount 30 and the second lens mount 40 in the optical axis O direction can be adjusted by the first guide rod 151 and the second guide rod 152, which is beneficial to improving the zoom stability of the camera module 1.

[0058] Please see Figure 4 and Figure 14 , Figure 14 This is a top view of the camera module. In this embodiment, along the plane of the side plate 120 of the base 10, the projection of the first piezoelectric motor 501 at least partially coincides with the projection of the second mirror mount 40; or, the projection of the second piezoelectric motor 502 at least partially coincides with the projection of the first mirror mount 30.

[0059] Combination Figure 4 and Figure 14Taking the plane along the side plate 120 of the base 10, i.e., the YZ plane shown in the figure, as an example, the projection of the second piezoelectric motor 502 at least partially coincides with the projection of the first mirror mount 30. The second piezoelectric motor 502 is fixed to one side of the second mirror mount 40 along the positive X direction, and at least part of the second piezoelectric motor 502 extends along the optical axis O to the side of the first mirror mount 30 along the positive X direction, i.e., along the YZ plane shown in the figure, the projection of the second piezoelectric motor 502 at least partially coincides with the projection of the first mirror mount 30. The first mirror mount 30 can be Z-shaped offset from the second mirror mount 40, thereby shortening the length occupied by the second piezoelectric motor 502 along the optical axis O. Similarly, the first piezoelectric motor 501 can also adopt the same design concept as the second piezoelectric motor 502.

[0060] This is beneficial for shortening the length of the camera module 1 along the optical axis O, and for miniaturizing the camera module 1.

[0061] Please see Figure 4 and Figure 13 , Figure 13 This is a schematic diagram of the structure of the camera module 1 with dual guides in an embodiment of this application. In one possible implementation, the base 10 is further provided with a third guide rod 161 and a fourth guide rod 162. The third guide rod 161 and the fourth guide rod 162 are disposed on opposite sides in the X direction, both parallel to the optical axis O, and extend along the optical axis O, connecting the front end face 131 and the rear end face 132 of the base 10. The third guide rod 161 is parallel to the first guide rod 151 in the Y direction, and the fourth guide rod 162 is parallel to the second guide rod 152 in the Y direction. The first mirror mount 30 is slidably connected to both the third guide rod 161 and the fourth guide rod 162, for example, through a sliding groove or a retaining ring.

[0062] Therefore, the first mirror mount 30 is slidably connected to the base 10 in both the X and Y directions, making the displacement of the first mirror mount 30 relative to the base 10 more stable, which is beneficial to improving the zoom stability of the camera module 1.

[0063] The following embodiments will describe in detail the structure of the piezoelectric drive assembly 50.

[0064] Please continue reading. Figure 4 , Figure 6 and Figure 7 In this embodiment, the first piezoelectric motor 501 further includes a frame 550, a first fixing member 560, and a second fixing member 570. The first fixing member 560 and the second fixing member 570 are respectively fixed to the frame 550, and the first fixing member 560 and the second fixing member 570 are arranged opposite to each other and configured to have an installation space 553 between them. The deformation member 520 is installed in the installation space 553 and the deformation member 520 abuts against the first fixing member 560 and the second fixing member 570 respectively.

[0065] The structure of the second piezoelectric motor 502 is the same as or similar to that of the first piezoelectric motor 501. This embodiment will be specifically described using the first piezoelectric motor 501. Specifically, the frame 550 is generally cuboid and has two end faces arranged opposite each other along the optical axis O. The second end face 541 is fixedly connected to the side plate 120 of the base 10, and the third end face 542 is fixedly connected to the first mirror mount 30. The third end face 542 includes a third groove 5421 for accommodating the first fixing member 560, the second fixing member 570, and the deformation member 520, etc. One end of the first fixing member 560 and the second fixing member 570 along the optical axis O is fixed to the bottom 5422 of the third groove 5421, that is, both the first fixing member 560 and the second fixing member 570 are fixed to the frame 550. The bottom 5422 of the third groove 5421 includes a third opening 5423, which is used for at least a portion of the driving member 510 to enter the third groove 5421 through the third opening 5423 and to be electrically connected to the second side 523 of the deformation member 520 along the optical axis O direction.

[0066] In one possible implementation, the first fastener 560 and the second fastener 570 can be integrally formed with the frame 550 or can be assembled separately. The fastening methods include, but are not limited to, welding, gluing and snap-fit ​​connection.

[0067] like Figure 7 As shown, a mounting space 553 is provided between the first fixing member 560 and the second fixing member 570 for accommodating and fixing the deformable component 520. The first fixing member 560 is generally L-shaped and is used to fix the second side surface 521 of the deformable component 520 along the optical axis O and the first end surface 522 along the Z direction. The second fixing member 570 is used to fix at least a portion of the driving component 510 to the second side surface 523 of the deformable component 520 along the optical axis O.

[0068] Therefore, except for the end fixed to the friction head 530, the other end faces of the deformation component 520 are directly or indirectly fixed to the frame 550. This is beneficial for the deformation component 520 to concentrate energy to the friction head 530 when it generates high-frequency vibration, and to ensure the structural stability of the piezoelectric drive assembly 50.

[0069] Please see Figure 7 , Figure 9 and Figure 10 , Figure 9 yes Figure 4 A top view of the first piezoelectric motor 501 in the image. Figure 10 yes Figure 9 Cross-sectional view at point AA.

[0070] In this embodiment of the application, the first piezoelectric motor 501 further includes a first elastic element 580. The first elastic element 580 is respectively provided between the first fixing member 560 and the frame 550 and between the second fixing member 570 and the frame 550. The first elastic element 580 is configured to be in a pre-compression state to provide pressure on the first fixing member 560 and the second fixing member 570 to the deformation member 520.

[0071] The first elastic element 580 comprises at least two elements, each approximately arc-shaped. The fifth end face 581 and the sixth end face 582 of the first elastic element 580, positioned opposite each other along the Y-axis, are embedded in the frame 550. The arc surface 583 of the first elastic element 580 abuts against the end of the first fixing element 560 or the second fixing element 570 opposite to the deformable component 520 along the optical axis O. This allows for the simultaneous application of pressure along the positive Y-axis to the first fixing element 560 and pressure along the opposite Y-axis to the second fixing element 570, effectively limiting the displacement of the deformable component 520 along the Y-axis. As an elastic element, the first elastic element 580 provides a restoring force to the deformable component 520 when it vibrates at high frequency in the YZ plane, limiting the displacement of the frame 550 along the Y-axis and maintaining the structural stability of the piezoelectric drive assembly 50.

[0072] Thus, the first elastic element 580 provides a set of opposing rebound forces along the optical axis O, so that the vibration of the deformable component 520 does not affect the structural stability of the frame 550, which is beneficial to maintaining the overall stability of the piezoelectric drive assembly 50.

[0073] In one possible implementation, the first piezoelectric motor 501 further includes a second elastic element 590. The second elastic element 590 is fixed to the fourth end face 542 of the frame, which is opposite to the base plate 110 along the X direction. The second elastic element 590 is generally elongated and extends along the optical axis O. At least a portion of the second elastic element 590 is fixed to the first fixing element 560 by a thermoplastic pressing. Pressure can be generated in the Z direction on the second elastic element 590, thereby causing the deformation component 520 to displace in the Z direction, driving the friction head 530 to generate static friction force to displace the first mirror mount 30 in the Y direction.

[0074] Therefore, the second elastic element 590 provides pressure along the X direction to the friction head 530, ensuring that the friction head 530 can effectively use static friction to move the first mirror mount 30 to move along the optical axis O, so that the camera module 1 can achieve continuous and stable zoom function.

[0075] The following embodiments will describe the specific structure of the drive component 510.

[0076] Please see Figure 4 , Figure 6 , Figure 7 and Figure 11 , Figure 11 yes Figure 4 A schematic diagram of some components in the first piezoelectric motor 501 is shown. The drive component 510 includes a first circuit board 511 and a second circuit board 512. Specifically, the first circuit board 511 is bent and includes a first end 5111 and a second end 5112. The first end 5111 passes through the third opening 5423 of the third end face 542 and enters the third groove 5421, and is electrically connected to the second side surface 523 of the deformation component 520. The side plate 120 of the base 10 is provided with a fourth opening 121, which is opposite to the third opening 5423 in the X direction to allow the second end 5112 to pass through. The second end 5112 is located outside the receiving space 140. The second end 5112 is provided with an interface 5113. The second circuit board 512 is generally square in shape and has an opening 5121, which is opposite to the interface 5113 in the X direction. The first circuit board 511 and the second circuit board 512 are electrically connected. The second circuit board 512 is used to provide voltage to the first circuit board 511 to drive the deformation component 520 to generate high-frequency vibration. Thus, by stably providing voltage to the deformation component 520 through the driving component 510, it is beneficial to ensure the efficient operation of the zoom function of the camera module 1.

[0077] In one possible implementation, the second circuit board 512 can also be electrically connected to the motherboard of the terminal device 1000, which supplies power to the camera module 1.

[0078] Please see Figure 7 In this embodiment, the deformation component 520 includes piezoelectric ceramic. After receiving the voltage from the first circuit board 511, the deformation component 520 can convert electrical energy into mechanical energy. When energized, the deformation component 520 can vibrate, thereby driving the first mirror mount 30 to produce a step-like displacement, enabling the camera module 1 to achieve stable zoom function.

[0079] In one possible implementation, the deformable component 520 can be barium titanate piezoelectric ceramic (BaTiO3), lead zirconate titanate piezoelectric ceramic, etc. Piezoelectric ceramics have advantages such as acid and alkali resistance, high energy conversion efficiency, no electromagnetic interference, and simple structure.

[0080] This helps to avoid failure of the camera module 1 due to temperature difference, and can provide sufficient power to enable the camera module 1 to have excellent zoom function. Furthermore, the piezoelectric ceramic is conducive to the miniaturization of the camera module 1.

[0081] Please see Figure 4In this embodiment, a position detection element 370 is provided on the first side 360 ​​of the side plate 120 near the base 10 of the first mirror mount 30. Specifically, the first side 360 ​​can be at least one side of the first mirror mount 30 in the positive or negative direction along the X direction. A second groove 361 is provided on the first side 360 ​​to accommodate the position detection element 370. The position detection element 370 can be a magnetic element, such as a sensing magnet, and is generally elongated. A fifth opening 122 is provided at the position of the position detection element 370 opposite to the side plate 120 along the X direction. It can be understood that the fourth opening 121 and the fifth opening 122 are located on opposite sides of the optical axis O, that is, the position detection element 370 should be located on both sides of the first mirror mount 30 along the X direction with the piezoelectric drive assembly 50. The fifth opening 122 is used to accommodate a position sensor 1221, which can be electrically connected to the second circuit board 512.

[0082] The position detection element 370 is fixed on the first mirror mount 30, which can be moved along the optical axis O by the piezoelectric drive assembly 50. The magnetic field on the surface of the position detection element 370 changes with the movement of the relative position sensor 1221, and a corresponding current is generated as the magnetic field changes. The second circuit board 512 can output the distance and position information of the first mirror mount 30's movement to the terminal device 1000 according to the magnitude of the current. Therefore, by setting the position detection element 370, it is beneficial for users to use the zoom function of the camera module 1.

[0083] Please see Figure 4 and Figure 12 , Figure 12 This is a cross-sectional view of the camera module 1 containing a magnetic conductor 552 and a magnet 380 in an embodiment of this application.

[0084] In this embodiment, a magnetic conductor 552 is provided at one end of the piezoelectric drive assembly 50 near the base plate 110 of the base 10. A magnet 380 is embedded at one end of the first mirror mount 30 opposite the magnetic conductor 552. The magnet 380 and the magnetic conductor 552 are configured to have the same magnetic poles to provide a force to the first mirror mount 30 away from the magnetic conductor 552. A magnetic force is generated between the magnetic conductor 552 and the magnet 380 of the first mirror mount 30, thereby providing additional compressive force to the first mirror mount 30 and the piezoelectric drive assembly 50, thus reducing the driving force required for the piezoelectric drive assembly 50 to drive the first mirror mount 30 to move.

[0085] Please see Figure 3 and Figure 4In this embodiment, a mounting groove 390 is provided at one end of the side plate 120 near the base 10 of the first lens mount 30, so that the first lens mount 30 has a main body 301 and a protrusion 302. The piezoelectric drive assembly 50 is embedded in the mounting groove 390, and along the radial direction of the second lens G2, the piezoelectric drive assembly 50 at least partially overlaps with the protrusion 302. The piezoelectric drive assembly 50 is configured such that the friction head 530 abuts against the protrusion 302 so that the first piezoelectric motor 501 can drive the protrusion 302 to move along the optical axis O. In one possible embodiment, the protrusion 302 includes a platform 350. Along the Z direction shown in the figure, the piezoelectric drive assembly 50 and the platform 350 are arranged sequentially, and the friction head 530 abuts against the platform 350. Thus, by the friction head 530 continuously contacting and moving the platform 350, it is beneficial for the camera module 1 to achieve zoom.

[0086] The above-disclosed embodiments are merely some preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A camera module, characterized in that, include: Base; The first mirror mount is slidably connected to the base; A first lens and a second lens, the first lens and the second lens having the same optical axis, the first lens being fixedly mounted on the base, and the second lens being mounted on the first lens mount; and A piezoelectric drive assembly is fixedly disposed on the base and located between the base and the first lens mount. The piezoelectric drive assembly includes a first piezoelectric motor, which includes a drive component, a deformation component, and a friction head. The drive component is electrically connected to the deformation component and provides an electrical signal to the deformation component. The deformation component is fixedly connected to the friction head. After receiving the electrical signal, the deformation component drives the friction head to move along the optical axis. During the movement, the friction head contacts and actuates the first lens mount to move along the optical axis, thereby driving the second lens to move relative to the base along the optical axis to achieve continuous zoom.

2. The camera module according to claim 1, characterized in that, The camera module also includes: The third lens and the second lens mount are provided. The third lens has the same optical axis as the first lens and the second lens, and the first lens, the second lens and the third lens are arranged in sequence. The second lens mount is disposed on the image side of the camera module, and the third lens is mounted on the second lens mount. The piezoelectric drive assembly further includes a second piezoelectric motor, which includes a drive component, a deformation component, and a friction head. The drive component is electrically connected to the deformation component and provides an electrical signal to the deformation component. The deformation component is fixedly connected to the friction head. After receiving the electrical signal, the deformation component drives the friction head to move along the optical axis. During the movement, the friction head contacts and actuates the second lens mount to move along the optical axis, thereby driving the third lens to move relative to the base along the optical axis to achieve continuous zoom.

3. The camera module according to claim 2, characterized in that, The first piezoelectric motor and the second piezoelectric motor are disposed on the same side of the base, and the first piezoelectric motor and the second piezoelectric motor are arranged side by side along the optical axis. The camera module further includes a first guide rod, which extends along the optical axis. The first lens mount and the second lens mount are slidably connected to the first guide rod. A plurality of ball bearings are respectively provided between the side of the first lens mount and the second lens mount away from the first guide rod and the base. The first lens mount and the second lens mount are connected to the base through the ball bearings.

4. The camera module according to claim 2, characterized in that, The first piezoelectric motor and the second piezoelectric motor are disposed on opposite sides of the base; The camera module further includes a first guide rod and a second guide rod. The first guide rod and the second guide rod are parallel and both extend along the optical axis. The first guide rod and the second guide rod are respectively located at the two ends of the radial direction of the first mirror mount and the second mirror mount. The first mirror mount and the second mirror mount are both slidably connected to the first guide rod and the first mirror mount and the second mirror mount are both slidably connected to the second guide rod.

5. The camera module according to claim 4, characterized in that, Along the plane of the side plate of the base, the projection of the first piezoelectric motor and the projection of the second mirror at least partially coincide; or, the projection of the second piezoelectric motor and the projection of the first mirror at least partially coincide.

6. The camera module according to claim 1, characterized in that, The first piezoelectric motor further includes a frame, a first fixing member, and a second fixing member. The first fixing member and the second fixing member are respectively fixed to the frame, and the first fixing member and the second fixing member are arranged opposite to each other and configured to have an installation space between them. The deformation component is installed in the installation space and abuts against the first fixing member and the second fixing member respectively.

7. The camera module according to claim 6, characterized in that, The first piezoelectric motor further includes an elastic element, which is provided between the first fixing member and the frame and between the second fixing member and the frame, and the elastic element is configured to be in a pre-compressed state to provide pressure on the deformable component to the first fixing member and the second fixing member.

8. The camera module according to claim 1, characterized in that, The piezoelectric drive assembly has a magnetic conductor at one end near the base plate of the base, and a magnet is embedded at one end of the first mirror opposite the magnetic conductor. The magnet and the magnetic conductor are configured to have the same magnetic poles to provide a force to the first mirror away from the magnetic conductor.

9. The camera module according to claim 1, characterized in that, The first lens mount has a mounting groove at one end of the side plate near the base, so that the first lens mount has a main body and a protrusion. The piezoelectric drive assembly is embedded in the mounting groove, and along the radial direction of the second lens, the piezoelectric drive assembly at least partially overlaps with the protrusion. The piezoelectric drive assembly is configured such that the friction head abuts against the protrusion so that the first piezoelectric motor can drive the protrusion to move along the optical axis.

10. A terminal device, characterized in that, The terminal device includes a device body and a camera module as described in any one of claims 1-9, wherein the camera module is mounted on the device body.

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