Camera module and electronic device

Abstract

A camera module and an electronic device, aiming at solving the technical problem of large size of an electronic device as a result of the size of a lens assembly in an optical axis direction being large. According to the camera module, an optical sensor is provided on an image side of a lens assembly; the lens assembly comprises a plurality of lenses arranged in an optical axis direction; the focal length f0 of the lens, which is away from the optical sensor, among the plurality of lenses and the maximum entrance pupil diameter (EPD) of the camera module satisfy: (I); a focusing apparatus is connected to the lens assembly so as to perform focusing. The size of the lens assembly in the optical axis direction can be reduced, so that the size of the camera module in the optical axis direction is reduced, thereby reducing the size of the camera module and the size of the electronic device.

Description

Lens modules and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 29, 2023, with application number 202311872169.1 and application name “Lens module and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the technical field of image acquisition devices, and specifically to a lens module and electronic equipment. Background Art

[0003] Electronic devices (such as mobile phones and tablets) are typically equipped with a lens module, which captures images of the outside world for functions such as taking photos or recording videos. The lens module includes a lens assembly and an optical sensor located on the image side of the lens assembly. By adjusting the distance between the lens assembly and the optical sensor, the lens assembly forms an image on the optical sensor. However, the lens assembly is relatively large along the optical axis, resulting in a bulky electronic device. Summary of the Invention

[0004] Embodiments of the present invention provide a lens module and electronic equipment, which can reduce the size of a lens assembly along the optical axis.

[0005] In a first aspect, an embodiment of the present application provides a lens module, comprising a lens assembly, an optical sensor, and a focusing device; the optical sensor is disposed on the image side of the lens assembly; the lens assembly comprises a plurality of lenses disposed along an optical axis, wherein the focal length f0 of the lens away from the optical sensor among the plurality of lenses satisfies the following conditions with respect to the maximum light entrance aperture EPD of the lens module: The focusing device is connected to the lens assembly for focusing.

[0006] Through the above configuration, the focal length f0 of the lens farthest from the optical sensor among the multiple lenses and the maximum light entrance aperture EPD of the lens module satisfy: The size of the lens assembly along the optical axis can be reduced to reduce the size of the lens module along the optical axis, thereby reducing the volume of the lens module and the electronic device.

[0007] In some embodiments that may include the above embodiments, the lens assembly includes a first lens group and a second lens group arranged along the optical axis, with the second lens group located between the first lens group and the optical sensor. The first lens group and the second lens group each include at least two lenses. The first lens group has a positive optical power, the second lens group has a negative optical power, and the lens assembly has a positive optical power. With this arrangement, light is converged by the lens assembly and irradiated onto the optical sensor. The combination of the first lens group and the second lens group can correct chromatic aberration and image aberration, thereby improving the imaging quality of the lens module.

[0008] In some embodiments that may include the above embodiments, the focusing device is connected to the first lens group to drive the first lens group to move along the optical axis. With this arrangement, when the focusing device 250 drives the first lens group to move, the number of lenses driven by the focusing device can be reduced, thereby increasing the focusing speed; on the other hand, a focusing device with a smaller driving force can be used for focusing, facilitating the miniaturization of the lens module.

[0009] In some embodiments that may include the above embodiments, the lens module further includes a lens holder. A light-transmitting channel is provided on the lens holder, the lens assembly is disposed in the light-transmitting channel, guiding columns are provided on the side wall of the light-transmitting channel, and the center line of the guiding columns is parallel to the optical axis; guiding grooves are provided on the side wall of the first lens group, and the guiding columns are slidably disposed in the guiding grooves to guide the first lens group; the focusing device is connected to the guiding grooves. Due to the high dimensional accuracy of the guiding grooves, connecting the focusing device to the guiding grooves can improve the focusing accuracy.

[0010] In some embodiments that may include the above embodiments, the focal length f1 of the first lens group, the focal length f2 of the second lens group, and the focal length f of the lens assembly satisfy: With this arrangement, the optical power of the first lens group and the second lens group can be reasonably distributed to increase the area of the image on the optical sensor (large target surface) and improve the imaging quality.

[0011] In some embodiments that may include the above embodiments, the refractive index ind1 of the lens farthest from the optical sensor among the multiple lenses satisfies: 1.6 < ind1. With this arrangement, the refractive index of the lens close to the light-transmitting cover plate is approximately the same as that of glass, and this lens can be made of glass, reducing the volume of the lens and further reducing the volume of the lens module.

[0012] In some embodiments that may include the above embodiments, the distance ct in the optical axis direction between two adjacent lenses in the first lens group that are farthest from the optical sensor satisfies: 0.03 mm < ct < 0.2 mm. With this arrangement, the distance between two adjacent lenses close to the light-transmitting cover plate is relatively large, facilitating the adjustment of the positions of the lenses in the first lens group.

[0013] In some embodiments that may include the above embodiments, the first lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged in the direction close to the optical sensor, and the second lens group includes a sixth lens and a seventh lens arranged in the direction away from the first lens group. With this arrangement, on the premise of ensuring the imaging quality, the number of lenses in the first lens group and the second lens group is relatively small, reducing the volume of the lens module.

[0014] In some embodiments, which may include the aforementioned embodiments, the optical powers of the first lens, the fourth lens, the fifth lens, and the sixth lens are all positive, and the optical powers of the second lens, the third lens, and the seventh lens are all negative.

[0015] In some embodiments, which may include the above embodiments, the optical powers of the first lens, the fifth lens, and the sixth lens are all positive, and the optical powers of the second lens, the third lens, the fourth lens, and the seventh lens are all negative.

[0016] In some embodiments, which may include the above embodiments, the optical powers of the first lens, the third lens, the fifth lens, and the sixth lens are all positive, and the optical powers of the second lens, the fourth lens, and the seventh lens are all negative.

[0017] In some embodiments that may include the above embodiments, the first lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged in a direction close to the optical sensor, and the second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged in a direction away from the first lens group.

[0018] In some embodiments, which may include the above embodiments, the optical powers of the first lens, the fourth lens, and the sixth lens are all positive, and the optical powers of the second lens, the third lens, the fifth lens, and the seventh lens are all negative.

[0019] In a second aspect, an embodiment of the present application further provides an electronic device, comprising: a housing and the lens module as described above, wherein the lens module is arranged on the housing.

[0020] In some embodiments that may include the above-mentioned embodiments, the lens module further includes a light-transmitting cover plate and a driving device, wherein the light-transmitting cover plate is arranged on the object side of the lens assembly; the driving device is connected to the light-transmitting cover plate, and the driving device is used to respond to a first operation of the user to drive the light-transmitting cover plate to move to a first position in a direction away from the lens assembly, and the driving device is also used to respond to a second operation of the user to drive the light-transmitting cover plate to move to a second position in a direction close to the lens assembly.

[0021] In this arrangement, the light-transmitting cover plate is located on the object side of the lens assembly, the optical sensor is located on the image side of the lens assembly, and the focusing device is connected to the lens assembly for focusing. A driving device is connected to the light-transmitting cover plate. In a first state, the driving device drives the light-transmitting cover plate to move away from the lens assembly to a first position. In a second state, the driving device drives the light-transmitting cover plate to move closer to the lens assembly to a second position. During use, the driving device drives the light-transmitting cover plate away from the lens assembly, thereby increasing the focusing distance and improving the imaging performance of the lens module.

[0022] When not in use, the driving device drives the transparent cover plate to move toward the direction close to the lens assembly, so as to reduce the size of the lens module along the optical axis, thereby reducing the thickness of the electronic device.

[0023] In some embodiments that may include the above-mentioned embodiments, the lens module also includes a telescopic device, which is arranged on the object side of the lens assembly, the telescopic device is spaced apart from the lens assembly, and the light-transmitting cover is arranged at one end of the telescopic device away from the lens assembly; the driving device is connected to the telescopic device to drive the telescopic device to move in a direction parallel to the optical axis.

[0024] In some embodiments that may include the above-mentioned embodiments, the outer shell is arranged to form an accommodating cavity, an opening connected to the accommodating cavity is provided on the outer shell, at least part of the lens module is arranged in the accommodating cavity, and the transparent cover plate is arranged opposite to the opening; in the first state, the driving device drives the transparent cover plate to move outside the accommodating cavity.

[0025] In some embodiments that may include the foregoing embodiments, the aperture number F of the lens module, the maximum light entrance aperture EPD of the lens module, the infinite focal length EFL of the lens module, the maximum image height IH of the optical sensor, and the length TTL of the lens assembly along the optical axis when the transparent cover is in the second position satisfy the following conditions: Through this arrangement, while ensuring image quality, the length of the lens assembly along the optical axis can be reduced when the light-transmitting cover is in the second position. This further reduces the size of the lens assembly along the optical axis when the light-transmitting cover is in the second position, further reducing the thickness of the electronic device. Furthermore, the maximum image height (IH) of the optical sensor can be increased (enabling a large image surface), while also enabling the lens module to have a larger aperture (enabling a large aperture).

[0026] In some embodiments that may include the above embodiments, when the light-transmitting cover is in the first position, the distance maxct between the first lens group and the second lens group along the optical axis satisfies the following relationship: 5 mm > maxct > 1 mm. This arrangement ensures that the lens assembly has sufficient focusing distance, thereby improving imaging quality.

[0027] In some embodiments that may include the above embodiments, when the transparent cover is in the first position, the distance maxct between the first lens group and the second lens group along the optical axis and the length TTL of the lens assembly along the optical axis when the transparent cover is in the second position satisfy the following relationship: In the working state and the non-working state, the distance between the first lens group and the second lens group is quite different. In the working state, the distance between the first lens group and the second lens group is larger, which increases the focusing distance of the lens assembly; in the non-working state, the distance between the first lens group and the second lens group is smaller, which can reduce the volume of the lens module.

[0028] In some embodiments that may include the above embodiments, when the transparent cover is in the first position, the distance maxct between the first lens group and the second lens group along the optical axis and the maximum image height IH of the optical sensor satisfy the following relationship: Under the premise of ensuring that the lens assembly has sufficient focusing distance, the optical sensor has a larger image height to achieve a large target surface.

[0029] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a housing and the lens module as described above, wherein the lens module is arranged on the housing.

[0030] In some embodiments that may include the above embodiments, the electronic device also includes a light-transmitting cover and a driving device, wherein the light-transmitting cover is arranged on the object side of the lens assembly; the driving device is connected to the light-transmitting cover, and the driving device is used to respond to a first operation of the user to drive the light-transmitting cover to move to a first position in a direction away from the lens assembly, and the driving device is also used to respond to a second operation of the user to drive the light-transmitting cover to move to a second position in a direction close to the lens assembly.

[0031] In some embodiments that may include the above-mentioned embodiments, the electronic device further includes a telescopic device, which is arranged on the object side of the lens assembly, the telescopic device is spaced apart from the lens assembly, and the light-transmitting cover is arranged at one end of the telescopic device away from the lens assembly; the driving device is connected to the telescopic device to drive the telescopic device to move in a direction parallel to the optical axis.

[0032] In some embodiments that may include the above-mentioned embodiments, the outer shell is enclosed to form an accommodating cavity, an opening connected to the accommodating cavity is provided on the outer shell, at least part of the lens module is arranged in the accommodating cavity, and the transparent cover is arranged opposite to the opening; the driving device is used to respond to the user's first operation to drive the transparent cover to move out of the accommodating cavity.

[0033] The electronic device provided in the embodiment of the present application includes the lens module in the above embodiment, and thus can achieve the same technical effects and solve the same technical problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] FIG1 is an exploded view of an electronic device provided in an embodiment of the present application;

[0035] FIG2 is a first structural diagram of the lens module provided by an embodiment of the present application when the light-transmitting cover plate is in the first position;

[0036] FIG3 is a second structural diagram of the lens module provided by an embodiment of the present application when the light-transmitting cover plate is in the first position;

[0037] FIG4 is a schematic structural diagram of an electronic device provided by an embodiment of the present application when the light-transmitting cover is in a first position;

[0038] FIG5 is a first structural diagram of the lens module provided by an embodiment of the present application when the light-transmitting cover plate is in the second position;

[0039] FIG6 is a second structural diagram of the lens module provided by an embodiment of the present application when the light-transmitting cover plate is in the second position;

[0040] FIG7 is a schematic structural diagram of an electronic device provided by an embodiment of the present application when the light-transmitting cover is in the second position;

[0041] FIG8 is a first structural diagram of each lens in a lens module provided in an embodiment of the present application;

[0042] FIG9 is a graph showing the performance of the lens module shown in FIG8 at different spatial frequencies;

[0043] FIG10 is a diagram of optical axial chromatic aberration of the lens module shown in FIG8 ;

[0044] FIG11 is a second structural diagram of each lens in the lens module provided in an embodiment of the present application;

[0045] FIG12 is a graph showing the performance of the lens module shown in FIG11 at different spatial frequencies;

[0046] FIG13 is a diagram of optical axial chromatic aberration of the lens module shown in FIG11 ;

[0047] FIG14 is a third structural diagram of each lens in the lens module provided in an embodiment of the present application;

[0048] FIG15 is a graph showing the performance of the lens module shown in FIG14 at different spatial frequencies;

[0049] FIG16 is a diagram of optical axial chromatic aberration of the lens module shown in FIG14 ;

[0050] FIG17 is a fourth structural diagram of each lens in the lens module provided in an embodiment of the present application;

[0051] FIG18 is a graph showing the performance of the lens module shown in FIG17 at different spatial frequencies;

[0052] FIG19 is a diagram of optical axial chromatic aberration of the lens module shown in FIG17 ;

[0053] FIG20 is a fifth structural diagram of each lens in the lens module provided in an embodiment of the present application;

[0054] FIG21 is a performance curve diagram of different spatial frequencies of the lens module shown in FIG20;

[0055] FIG22 is a diagram of optical axial chromatic aberration of the lens module shown in FIG20 ;

[0056] FIG23 is a sixth structural diagram of each lens in the lens module provided in an embodiment of the present application;

[0057] FIG24 is a graph showing the performance of the lens module shown in FIG23 at different spatial frequencies;

[0058] FIG25 is a diagram of optical axial chromatic aberration of the lens module shown in FIG23 .

[0059] Explanation of the reference numerals: 10: electronic device; 11: display panel; 12: outer casing; 13: middle frame; 14: back cover; 15: accommodating cavity; 16: battery; 17: main board; 18: opening; 20: lens module; 211: light-transmitting cover plate; 212: telescopic device; 220: lens assembly; 221: first lens group; 222: second lens group; 230: filter; 240: optical sensor; 250: focusing device; 260: driving device; 270: aperture; L1: first lens; L2: second lens; L3: third lens; L4: fourth lens; L5: fifth lens; L6: sixth lens; L7: seventh lens. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0061] In the following, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0062] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left", "right", "horizontal" and "vertical" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0063] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0064] The present invention provides an electronic device, which may include a mobile phone, a tablet computer, a smart bracelet, a smart watch, etc. The present invention does not limit the electronic device. The electronic device includes a lens module, which can realize functions such as taking pictures and recording videos.

[0065] The following description will use a mobile phone as an example of an electronic device. It is understood that the electronic devices in the embodiments of the present application are not limited to mobile phones. Referring to Figure 1, the electronic device 10 includes a housing 12 and a display panel 11, wherein the housing 12 may include a middle frame 13 and a back cover 14, the display panel 11 covers one side of the middle frame 13, and the back cover 14 covers the other side of the middle frame 13, and the middle frame 13, back cover 14 and display panel 11 are arranged to form a receiving cavity 15; the electronic device 10 also includes a battery 16 and a motherboard 17 disposed in the receiving cavity 15, the motherboard 17 and battery 16 can be fixed to the middle frame 13, and the motherboard 17 is electrically connected to the battery 16 and the display panel 11.

[0066] In some embodiments, the lens module 20 can be a rear camera. Accordingly, an opening 18 is provided on the back cover 14. The lens module 20 can be provided in the accommodating cavity 15, and the lens module 20 is facing the opening 18; the lens module 20 is electrically connected to the main board 17 to take photos or videos under the control of the main board 17.

[0067] In other embodiments, the lens module 20 can also be a front camera. Accordingly, an opening 18 is provided on the display panel 11, the lens module 20 is provided in the accommodating cavity 15, and the lens module 20 is facing the opening 18; the lens module 20 is electrically connected to the main board 17 to take photos or videos under the control of the main board 17.

[0068] Please refer to Figure 2. In the embodiment of the present application, the lens module 20 includes a transparent cover plate 211, a lens assembly 220 and an optical sensor 240. The transparent cover plate 211, the lens assembly 220 and the optical sensor 240 can be arranged along the optical axis. The optical sensor 240 is located on the image side of the lens assembly 220, and the transparent cover plate 211 is located on the object side of the lens assembly 220. The external light passes through the transparent cover plate 211 and the lens assembly 220 and is received by the optical sensor 240 to form an image on the optical sensor 240; the optical sensor 240 is electrically connected to the main board 17 shown in Figure 1 to convert the received image into an electrical signal and send it to the main board 17, thereby realizing photo taking or video recording.

[0069] In the above implementation, the optical sensor 240 may include a photosensitive device such as a CCD image sensor or a CMOS image sensor. The embodiment of the present application does not impose any restrictions on the optical sensor 240, as long as it can convert the image formed by the lens assembly 220 into an electrical signal and transmit it to the mainboard 17. Exemplarily, the lens module 20 may further include a circuit board, and the optical sensor 240 may be disposed on a surface of the circuit board. The circuit board may be provided with a circuit electrically connected to the optical sensor 240, and the circuit may be electrically connected to the mainboard 17, so that the mainboard 17 and the optical sensor 240 are electrically connected via the circuit board.

[0070] Referring to Figure 3 , in the embodiment of the present application, the lens module 20 may further include an aperture 270 and a filter 230 . The aperture 270 is disposed between the lens assembly 220 and the light-transmitting cover plate 211 . The aperture 270 can limit the amount of light passing through the lens assembly 220 . Exemplarily, the aperture 270 may be a variable aperture 270 . The variable aperture 270 can be electrically connected to the mainboard 17 , and the amount of light passing through the variable aperture 270 can be controlled by the mainboard 17 to adapt to different shooting and video recording scenarios. The filter 230 is disposed between the optical sensor 240 and the lens assembly 220 . The filter 230 can filter light directed to the optical sensor 240 to remove desired light and improve image quality.

[0071] The lens assembly 220 includes multiple lenses arranged along the optical axis. Light from the outside world passes through each lens in sequence and forms an image on the optical sensor 240. The present embodiment does not limit the number of lenses in the lens assembly 220. Properly setting the number of lenses and the optical power of the lenses can improve the clarity of the image formed by the lens assembly 220 on the optical sensor 240.

[0072] In the embodiment of the present application, the lens module 20 further includes a focusing device 250, which is connected to the lens assembly 220 for focusing. In some embodiments, the focusing device 250 can be connected to the lens assembly 220 and the circuit board. The focusing device 250 can drive the lens assembly 220 to move relative to the circuit board, thereby adjusting the distance between the lens assembly 220 and the optical sensor 240 to improve the clarity of the image formed on the optical sensor 240.

[0073] 3 , in other embodiments, a focusing device 250 can be connected to several lenses in the lens assembly 220 to drive the lenses to move along the optical axis, thereby achieving focusing. For example, the lens assembly 220 can include a first lens group 221 and a second lens group 222, which are arranged along the optical axis. The first lens group 221 and the second lens group 222 each include at least two lenses. The second lens group 222 can be connected to a circuit board so that the distance between the second lens group 222 and the optical sensor 240 is constant. The focusing device 250 can be connected to the first lens group 221. The focusing device 250 can drive the first lens group 221 to move along the optical axis to adjust the distance between the first lens group 221 and the second lens group 222 to achieve focusing. In this configuration, the focusing device 250 drives the first lens group 221 to move, which can reduce the number of lenses driven by the focusing device 250 and thereby increase the focusing speed; on the other hand, a focusing device 250 with a smaller driving force can be used for focusing, so as to facilitate the miniaturization of the lens module 20.

[0074] For example, the first lens group 221 has a positive optical power, the second lens group 222 has a negative optical power, and the lens assembly 220 has a positive optical power. With this arrangement, light is converged by the lens assembly 220 and then irradiated onto the optical sensor 240. Furthermore, the combination of the first lens group 221 and the second lens group 222 can correct chromatic aberration and aberration, thereby improving the imaging quality of the lens module 20.

[0075] In some embodiments, each lens in the second lens group 222 can be a trimmed lens, that is, the projection of each lens on the light sensor 240 is non-circular. Of course, each lens in the second lens group 222 can also be a non-trimmed lens, that is, the projection of each lens on the light sensor 240 is circular.

[0076] In some embodiments, the light entrance surface and / or light exit surface of the lens in the second lens group 222 near the optical sensor 240 is a toric surface to improve imaging quality. In some implementations, the focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0077] With such an arrangement, the optical powers of the first lens group 221 and the second lens group 222 can be reasonably distributed to increase the image area (larger target surface) on the optical sensor 240 and improve the imaging quality.

[0078] In the above embodiment, the focusing device 250 may include a voice coil motor (VCM). The VCM's magnet may be mounted on a circuit board, and the VCM's coil may be connected to the first lens group 221. When power is supplied to the VCM's coil, the VCM drives the first lens group 221 to move along the optical axis, thereby achieving VCM focusing of the lens module 20. Alternatively, the VCM's magnet may be connected to the first lens group 221, and the VCM's coil may be mounted on a circuit board. When power is supplied to the VCM's coil, the VCM drives the first lens group 221 to move along the optical axis, thereby achieving VCM focusing of the lens module 20. Alternatively, the focusing device 250 may include a piezoelectric motor. The piezoelectric motor may include a piezoelectric ceramic. The piezoelectric ceramic is connected to the first lens group 221. When power is supplied to the piezoelectric ceramic, the piezoelectric ceramic is deformed, thereby driving the first lens group 221 to move along the optical axis, thereby achieving focusing.

[0079] In some embodiments, the lens module 20 further includes a lens frame having a light-transmitting channel disposed thereon, the lens assembly 220 being disposed within the light-transmitting channel, and guide posts disposed on the sidewalls of the light-transmitting channel, the centerlines of the guide posts being parallel to the optical axis. A guide groove is disposed on the sidewalls of the first lens group 221, and the guide posts slide within the guide grooves to guide the first lens group 221, ensuring that the centerline of the first lens group 221 is always collinear with the optical axis during focusing. A focusing device 250 is connected to the guide groove, for example, by connecting the focusing device 250 to the sidewalls and / or bottom of the guide groove. Due to the high dimensional accuracy of the guide groove, the connection of the focusing device 250 to the guide groove can improve focusing accuracy.

[0080] In some embodiments, the lens module 20 may further include a moving device connected to the first lens group 221, capable of driving the first lens group 221 to move along the optical axis. When the light-transmitting cover is in the first position, the moving device may drive the first lens group 221 to move away from the optical sensor 240. Exemplarily, the moving device may include a voice coil motor or a piezoelectric motor, although this embodiment of the present application is not limited thereto.

[0081] It is understood that the moving device can be the same device as the focusing device 250. Of course, the moving device and the focusing device 250 can also be different devices. Accordingly, the moving device can be connected to the first lens group 221 through the focusing device 250; or the focusing device 250 can be connected to the first lens group 221 through the moving device. In this case, the moving device can be connected to the guide groove to improve the position accuracy of the first lens group during movement.

[0082] Continuing with reference to FIG3 , in the embodiment of the present application, the light-transmitting cover plate 211 is located on the object side of the lens assembly 220. The light-transmitting cover plate 211 can provide protection and dustproof functions for the lens assembly 220. The material of the light-transmitting cover plate 211 can include glass, resin, etc., and the embodiment of the present application does not limit the material of the light-transmitting cover plate 211. The lens module 20 also includes a driving device 260, which is connected to the light-transmitting cover plate 211. In the embodiment in which the lens module 20 includes a circuit board, the driving device 260 can be provided on the housing 12, and the driving device 260 is used to drive the light-transmitting cover plate 211 to move along the optical axis.

[0083] As shown in Figures 2 and 3, the drive device 260 is used to respond to a first user operation to drive the transparent cover plate 211 to move away from the lens assembly 220 to a first position, thereby increasing the distance between the transparent cover plate 211 and the optical sensor 240, thereby increasing the focusing distance of the lens assembly 220, ensuring that the lens module has a sufficiently long focusing movement distance when imaging from infinity to a close object distance, thereby improving imaging performance. As shown in Figures 5 and 6, the drive device 260 is also used to respond to a second user operation to drive the transparent cover plate 211 to move toward the lens assembly 220 to a second position, thereby reducing the thickness of the lens module 20 along the optical axis, thereby facilitating the miniaturization of the electronic device 10 shown in Figure 1.

[0084] As shown in FIG1 , in an embodiment of the present application, the housing 12 (e.g., back cover 14) of the electronic device 10 may be provided with an opening 18 communicating with the accommodating cavity 15, and the lens module 20 is disposed within the accommodating cavity 15. As shown in FIG3 and FIG4 , in response to a first user operation, the driving device 260 drives the light-transmitting cover plate 211 to extend from the opening 18 to enable photographing or recording. As shown in FIG6 and FIG7 , in response to a second user operation, the driving device 260 drives the light-transmitting cover plate 211 to move into the opening 18 to reduce the thickness of the electronic device 10. It can be understood that when the light-transmitting cover 211 moves to the second position, the light-transmitting cover 211 can be located in the opening 18, and the light-transmitting cover 211 is flush with the outer surface of the housing 12 to enhance the decorative effect of the electronic device 10; of course, in other implementations, when the light-transmitting cover 211 moves to the second position, part of the light-transmitting cover 211 can be located outside the opening 18, or there is a smaller distance between the light-transmitting cover 211 and the outer surface of the housing 12, and the embodiments of the present application do not limit this.

[0085] It is understood that the user's first operation can be the user triggering a photo or video start button or APP on the electronic device 10. After the transparent cover 211 reaches the first position, the lens module 20 enters the working state (capable of taking photos, focusing, etc.). The user's second operation can be the user triggering a photo or video stop button or closing the APP on the electronic device 10. The first position can be the position of the transparent cover 211 when the distance between the transparent cover 211 and the optical sensor 240 is the largest, and the second position can be the position of the transparent cover 211 when the transparent cover 211 is in contact with or about to contact the lens assembly 220.

[0086] Continuing with reference to Figures 3 and 6, in some embodiments, the lens module 20 further includes a telescopic device 212, which is disposed on the object side of the lens assembly 220, spaced apart from the lens assembly 220, and a light-transmitting cover plate 211 disposed at the end of the telescopic device 212 facing away from the lens assembly 220. The telescopic device 212 is disposed within the opening 18, and a drive device 260 is disposed on the housing 12, the drive device 260 being connected to the telescopic device 212 to drive the telescopic device 212 to move in a direction parallel to the optical axis. With this arrangement, when in the first position, the telescopic device 212 can achieve a seal between the light-transmitting cover plate 211 and the back cover 14, thereby preventing external impurities such as dust and water droplets from entering the accommodating cavity 15 through the opening 18.

[0087] Exemplarily, the telescopic device 212 may include a lens barrel arranged in the opening 18, the center line of the lens barrel is parallel to the optical axis, and the lens barrel is slidably connected to the rear cover 14; the transparent cover plate 211 is arranged at one end of the lens barrel away from the lens assembly 220, and the driving device 260 is connected to the lens barrel, and the driving device drives the lens barrel to move along the optical axis, thereby driving the transparent cover plate 211 to move.

[0088] The embodiment of the present application does not limit the driving device 260. The driving device 260 may include a driving motor, a driving nut and a screw. The driving motor can be set on the back cover 14, and the screw can be rotatably connected to the back cover 14, and the driving motor is transmission-connected to the screw; accordingly, the driving nut is connected to the telescopic device 212, and the driving screw cooperates with the driving nut. In response to the first operation, the driving motor drives the screw to rotate, and then drives the telescopic device 212 to move away from the lens assembly 220 through the driving nut until the transparent cover 211 moves to the first position; in response to the second operation, the driving motor drives the screw to rotate, and then drives the telescopic device 212 to move toward the circuit board through the driving nut until the transparent cover 211 moves to the second position.

[0089] In other implementations, the driving device 260 may also include an electromagnet and a spring. The coil of the electromagnet may be set on the back cover 14, the armature of the electromagnet is connected to the telescopic device 212, one end of the spring is connected to the back cover 14, and the other end of the spring is connected to the telescopic device 212; in response to the first operation, the coil of the electromagnet is energized, which can drive the armature to move away from the lens assembly 220, so as to drive the transparent cover plate 211 to move away from the lens assembly 220 until the transparent cover plate 211 moves to the first position. During the above process, the spring undergoes elastic deformation; in response to the second operation, the coil of the electromagnet is de-energized, and the spring drives the telescopic device 212 to move toward the circuit board through elastic force until the transparent cover plate 211 is in the second position.

[0090] In the embodiment of the present application, the telescopic device 212 is spaced apart from the lens assembly 220, that is, the driving device 260, the transparent cover plate 211 and the telescopic device 212 are not connected to the lens assembly 220, so as to achieve decoupling between the transparent cover plate 211 and the lens assembly 220, thereby avoiding affecting the imaging of the lens assembly 220.

[0091] In some embodiments, the lens module 20 may further include a self-locking device that can lock the light-transmitting cover plate 211 when it is in the first position to prevent the light-transmitting cover plate 211 from moving when taking a picture. Exemplarily, the locking device may include an electromagnet, the armature of the electromagnet may be connected to the lens barrel, and the coil of the electromagnet may be provided on the rear cover 14. When the light-transmitting cover plate 211 is in the first position, the armature is close to the coil. At this time, energizing the coil can cause the coil to attract the armature, so that the light-transmitting cover plate 211 remains in the first position. Of course, in other implementations, the locking device may further include an electric push rod, the electric push rod being provided on the rear cover, and a limiting hole being provided on the lens barrel. When the light-transmitting cover plate 211 is in the first position, the telescopic rod of the electric push rod extends and is provided in the limiting hole to limit the lens barrel and the light-transmitting cover plate.

[0092] Continuing with Figures 3 and 6, the lens module 20 provided in an embodiment of the present application includes a light-transmitting cover plate 211 located on the object side of the lens assembly 220, an optical sensor 240 located on the image side of the lens assembly 220, and a focusing device 250 connected to the lens assembly 220 for focusing. A driving device 260 is connected to the light-transmitting cover plate 211. In response to a first operation, the driving device 260 drives the light-transmitting cover plate 211 to move to a first position away from the lens assembly 220. In response to a second operation, the driving device 260 drives the light-transmitting cover plate 211 to move to a second position toward the lens assembly. When in use, the driving device 260 drives the light-transmitting cover plate 211 away from the lens assembly 220, thereby increasing the focusing distance and improving the imaging performance of the lens module 20. When not in use, the driving device 260 drives the light-transmitting cover plate 211 toward the lens assembly 220 to reduce the size of the lens module 20 along the optical axis, thereby reducing the thickness of the electronic device 10.

[0093] In other embodiments, the light-transmitting cover plate 211, the driving device 260, the telescopic device 212, and the self-locking device may not belong to the lens module 20. Accordingly, the light-transmitting cover plate 211, the driving device 260, the telescopic device 212, and the self-locking device may belong to the housing 12 or the electronic device 10. It is understandable that when the light-transmitting cover plate 211, the driving device 260, the telescopic device 212, and the self-locking device belong to the housing 12 or the electronic device 10, the structure and connection relationship of the light-transmitting cover plate 211, the driving device 260, the telescopic device 212, and the self-locking device are substantially the same as when the light-transmitting cover plate 211, the driving device 260, the telescopic device 212, and the self-locking device belong to the lens module 20.

[0094] In the embodiment of the present application, the lens assembly 220 includes a plurality of lenses arranged along the optical axis. The focal length f0 of the lens close to the transparent cover plate 211 among the plurality of lenses and the maximum light entrance aperture EPD of the lens module 20 satisfy:

[0095] With such a configuration, the size of the lens assembly 220 along the optical axis can be reduced, thereby reducing the size of the lens module 20 along the optical axis, thereby reducing the volume of the lens module 20.

[0096] It is understood that the light entrance aperture of the lens module 20 can be a clear aperture. In some embodiments, the lens module 20 further includes an aperture 270 located between the lens assembly 220 and the light-transmitting cover plate 211. The aperture 270 can control the amount of light entering the lens assembly 220. Accordingly, the light entrance aperture can be the diameter of the aperture 270.

[0097] In the embodiment of the present application, the aperture number F of the lens module 20, the maximum light entrance aperture EPD of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the length TTL of the lens assembly 220 along the optical axis when the transparent cover 211 is in the second position meet the following conditions:

[0098] Through the above arrangement, while ensuring imaging quality, the length of the lens assembly 220 along the optical axis can be reduced when the light-transmitting cover plate 211 is in the second position, further reducing the size of the lens assembly 220 along the optical axis when the light-transmitting cover plate 211 is in the second position, thereby further reducing the thickness of the electronic device 10. In addition, the maximum image height IH of the optical sensor 240 can be increased (to achieve a large target surface), and the lens module 20 can also have a larger aperture (to achieve a large aperture).

[0099] As shown in FIG. 3, in the embodiment of the present application, when the light-transmitting cover plate 211 is in the first position, the distance maxct between the first lens group 221 and the second lens group 222 in the optical axis direction satisfies: 5 mm > maxct > 1 mm. With such a setting, it can be ensured that the lens assembly 220 has sufficient focusing distance to improve the imaging quality.

[0100] In some embodiments, when the light-transmitting cover plate 211 is in the first position, the distance maxct between the first lens group 221 and the second lens group 222 in the optical axis direction and the length TTL of the lens assembly 220 in the optical axis direction when the light-transmitting cover plate 211 is in the second position satisfy:

[0101] Through the above setting, the distance between the first lens group 221 and the second lens group 222 varies greatly between the working state and the non-working state. The distance between the first lens group 221 and the second lens group 222 is larger in the working state, increasing the focusing distance of the lens assembly 220; the distance between the first lens group 22,1 and the second lens group 222 is smaller in the non-working state, which can reduce the volume of the lens module 20.

[0102] In some embodiments, when the light-transmitting cover plate 211 is in the first position, the distance maxct between the first lens group 221 and the second lens group 222 in the optical axis direction and the maximum image height IH of the optical sensor 240 satisfy:

[0103] Through the above setting, on the premise of ensuring that the lens assembly 220 has sufficient focusing distance, the optical sensor 240 has a larger image height to achieve a large target surface.

[0104] In the embodiment of the present application, the refractive index ind1 of the lens close to the light-transmitting cover plate 211 among the multiple lenses satisfies: 1.6 < ind1. That is to say, the refractive index ind1 of the lens close to the light-transmitting cover plate 211 in the first lens group 221 satisfies: 1.6 < ind1. With such a setting, the refractive index of the lens close to the light-transmitting cover plate 211 is approximately the same as that of the glass, and this lens can be made of glass, which can reduce the volume of the lens to further reduce the volume of the lens module 20.

[0105] In some embodiments, the distance ct between two adjacent lenses in the first lens group 221 close to the light-transmitting cover plate 211 in the optical axis direction satisfies: 0.03 mm < ct < 0.2 mm. The distance between two adjacent lenses close to the light-transmitting cover plate 211 is larger, which is convenient for adjusting the positions of the lenses in the first lens group 221.

[0106] Continuing with Figures 3 and 6 , in the above-described embodiment, the lens module 20 may have a shift function. Accordingly, the lens module 20 may include a shift device that can be connected to the lens assembly 220 or the optical sensor 240 to form a certain angle between the optical axis of the lens assembly 220 and the sensor 240, which may be ±10°. The shift device can also shift the intersection between the optical axis of the lens assembly 220 and the sensor 240 by a certain distance, which may be ±1mm. This arrangement allows the lens module 20 to adjust the focal plane and change the sharp point to suit photography of people, buildings, commercial photography, etc.

[0107] In some embodiments, the lens module 20 may have an anti-shake function. For example, the lens module 20 may include an optical image stabilizer (OIS). The OIS may be connected to the lens assembly 220 so that the lens assembly 220 can float relative to the optical sensor 240 to correct the optical axis offset of the lens assembly during shaking and improve image quality. It is understood that the OIS may also be connected to the optical sensor 240 so that the optical sensor 240 can float relative to the lens assembly 220.

[0108] Referring to Figure 8 , in the embodiment of the present application, the first lens group 221 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, disposed away from the light-transmitting cover plate 211. The second lens group 222 includes a sixth lens L6 and a seventh lens L7, disposed away from the first lens group 221. The first lens group 221, comprising the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5, has positive optical power, while the second lens group 222, comprising the sixth lens L6 and the seventh lens L7, has negative optical power. This arrangement allows the first lens group 221 and the second lens group 222 to have a relatively small number of lenses while maintaining image quality, thereby reducing the size of the lens module 20.

[0109] It is understood that the embodiment of the present application does not limit the number of lenses in the first lens group 221 and the second lens group 222 and the optical power of the corresponding lenses. The parameters of the lens module 20 will be introduced in the following with multiple examples:

[0110] Example 1

[0111] Continuing with Figure 8 , in this example, the first lens group 221 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, disposed away from the light-transmitting cover plate 211. The second lens group 222 includes a sixth lens L6 and a seventh lens L7, disposed away from the first lens group 221. The first lens L1, the fourth lens L4, the fifth lens L5, and the sixth lens L6 all have positive refractive powers, while the second lens L2, the third lens L3, and the seventh lens L7 all have negative refractive powers.

[0112] In some examples, when the aperture number F of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the transparent cover 211 are in the second position, the length TTL of the lens assembly 220 along the optical axis satisfies: The maximum light entrance aperture EPD of the lens module 20 and the infinite focal length EFL of the lens module 20 satisfy the following conditions: The refractive index of the first lens L1 is ind1 = 1.855. The distance between the first lens L1 and the second lens along the optical axis is ct = 0.0582 mm. When the transparent cover plate 211 is in the first position, the distance maxct between the first lens group 221 and the second lens group 222 along the optical axis and the length TTL of the lens assembly 220 along the optical axis when the transparent cover plate 211 is in the second position satisfy the following relationship: The focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0113] Table 1a shows the basic parameters of the lens module 20.

[0114] Table 1a

[0115] Table 1b shows the parameters of each lens, where L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, L6 is the sixth lens, and L7 is the seventh lens. S1 is the light incident surface of the corresponding lens, and S2 is the light exit surface of the corresponding lens.

[0116] Table 1b

[0117] Table 1c shows the conic coefficient and aspheric coefficient of each lens.

[0118] Table 1c

[0119] As shown in Table 1c, the first lens L1 to the seventh lens L7 have a total of 14 surfaces, all of which are aspherical. Among them, the surface shape z of each even-order aspherical surface satisfies:

[0120] Among them, z is the aspheric surface sag, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0121] Figure 9 shows the performance curves of lens module 20 at different spatial frequencies in this example. The solid lines in Figure 9 represent the modulation transfer function (MTF) of light at different spatial frequencies in the sagittal direction, while the dashed lines represent the MTF of light at different spatial frequencies in the tangential direction. As shown in Figure 9 , when the resolution is less than 100 lp / mm, the MTF corresponding to each curve is greater than 50%. This means that the MTF at different fields of view is high in both the sagittal and tangential directions, resulting in high imaging quality for lens module 20.

[0122] Figure 10 is an optical axial chromatic aberration diagram of the lens module 20 in this example. Different curves in Figure 10 correspond to light of different wavelengths. The vertical axis is the normalized aperture, and the horizontal axis is the defocus distance (the distance from the optical axis). It can be seen from Figure 10 that the axial chromatic aberration of the lens module 20 in this example is better.

[0123] Example 2

[0124] Referring to Figure 11 , in this example, the first lens group 221 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, disposed away from the light-transmitting cover plate 211. The second lens group 222 includes a sixth lens L6 and a seventh lens L7, disposed away from the first lens group 221. The first lens L1, the fifth lens L5, and the sixth lens L6 all have positive refractive powers, while the second lens L2, the third lens L3, the fourth lens L4, and the seventh lens L7 all have negative refractive powers.

[0125] In some examples, the aperture number F of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the length TTL of the lens assembly 220 along the optical axis when the transparent cover 211 is in the second position satisfy the following relationship: The maximum light entrance aperture EPD of the lens module 20 and the infinite focal length EFL of the lens module 20 satisfy the following conditions: The refractive index of the first lens is ind1 = 1.855. The distance between the first lens and the second lens along the optical axis is ct = 0.035 mm. When the transparent cover plate 211 is in the first position, the distance between the first lens group 221 and the second lens group 222 along the optical axis is maxct = 2.8238 mm. When the transparent cover plate 211 is in the second position, the length TTL of the lens assembly 220 along the optical axis satisfies the following relationship: The focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0126] Table 2a shows the basic parameters of the lens module 20.

[0127] Table 2a

[0128] Table 2b shows the parameters of each lens, where L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, L6 is the sixth lens, and L7 is the seventh lens. S1 is the light incident surface of the corresponding lens, and S2 is the light exit surface of the corresponding lens.

[0129] Table 2b

[0130] Table 2c shows the conic coefficient and aspheric coefficient of each lens.

[0131] Table 2c

[0132] As shown in Table 2c, the first lens L1 to the seventh lens L7 have a total of 14 surfaces, all of which are aspherical. Among them, the surface shape z of each even-order aspherical surface satisfies:

[0133] Among them, z is the aspheric surface sag, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0134] Figure 12 shows the performance curves of lens module 20 at different spatial frequencies in this example. The solid lines in Figure 12 represent the modulation transfer function (MTF) of light at different spatial frequencies in the sagittal direction, while the dashed lines represent the MTF of light at different spatial frequencies in the tangential direction. As shown in Figure 12, when the resolution is less than 100 lp / mm, the MTF corresponding to each curve is greater than 50%. This means that the MTF at different fields of view is high in both the sagittal and tangential directions, resulting in high imaging quality for lens module 20.

[0135] Figure 13 is an optical axial chromatic aberration diagram of the lens module 20 in this example. Different curves in Figure 13 correspond to light of different wavelengths. The vertical axis is the normalized aperture, and the horizontal axis is the defocus distance (the distance from the optical axis). It can be seen from Figure 13 that the axial chromatic aberration of the lens module 20 in this example is better.

[0136] Example 3

[0137] As shown in FIG14 , this example differs from Example 1 in that the aperture number F of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the length TTL of the lens assembly 220 along the optical axis when the transparent cover 211 is in the second position satisfy the following conditions: The maximum light entrance aperture EPD of the lens module 20 and the infinite focal length EFL of the lens module 20 satisfy the following conditions: The refractive index of the first lens is ind1 = 1.809. The distance between the first lens and the second lens along the optical axis is ct = 0.09 mm. When the transparent cover plate 211 is in the first position, the distance between the first lens group 221 and the second lens group 222 along the optical axis is maxct = 2.9789. When the transparent cover plate 211 is in the second position, the length TTL of the lens assembly 220 along the optical axis satisfies: The focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0138] Table 3a shows the basic parameters of the lens module 20.

[0139] Table 3a

[0140] Table 3b shows the parameters of each lens, where L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, L6 is the sixth lens, and L7 is the seventh lens. S1 is the light incident surface of the corresponding lens, and S2 is the light exit surface of the corresponding lens.

[0141] Table 3b

[0142] Table 3c shows the conic coefficient and aspheric coefficient of each lens.

[0143] Table 3c

[0144] As shown in Table 3c, the first lens L1 to the seventh lens L7 have a total of 14 surfaces, all of which are aspherical. Among them, the surface shape z of each even-order aspherical surface satisfies:

[0145] Among them, z is the aspheric surface sag, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0146] Figure 15 shows the performance curves of lens module 20 at different spatial frequencies in this example. The solid lines in Figure 15 represent the modulation transfer function (MTF) of light at different spatial frequencies in the sagittal direction, while the dashed lines represent the MTF of light at different spatial frequencies in the tangential direction. As shown in Figure 15 , when the resolution is less than 100 lp / mm, the MTF corresponding to each curve is greater than 45%. This means that the MTF at different fields of view is high in both the sagittal and tangential directions, resulting in high imaging quality for lens module 20.

[0147] Figure 16 is an optical axial chromatic aberration diagram of the lens module 20 in this example. Different curves in Figure 16 correspond to light of different wavelengths. The vertical axis is the normalized aperture and the horizontal axis is the defocus distance (the distance from the optical axis). It can be seen from Figure 16 that the axial chromatic aberration of the lens module 20 in this example is better.

[0148] Example 4

[0149] As shown in FIG17 , this example differs from Example 1 in that the aperture number F of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the length TTL of the lens assembly 220 along the optical axis when the light-transmitting cover plate 211 is in the second position satisfy the following conditions: The maximum light entrance aperture EPD of the lens module 20 and the infinite focal length EFL of the lens module 20 satisfy the following conditions: The refractive index of the first lens is ind1 = 1.809. The distance between the first lens and the second lens along the optical axis is ct = 0.08 mm. When the transparent cover plate 211 is in the first position, the distance between the first lens group 221 and the second lens group 222 along the optical axis, maxct = 2.42 mm, and the length TTL of the lens assembly 220 along the optical axis when the transparent cover plate 211 is in the second position satisfy the following relationship: The focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0150] Table 4a shows the basic parameters of the lens module 20.

[0151] Table 4a

[0152] Table 4b shows the parameters of each lens, where L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, L6 is the sixth lens, and L7 is the seventh lens. S1 is the light incident surface of the corresponding lens, and S2 is the light exit surface of the corresponding lens.

[0153] Table 4b

[0154] Table 4c shows the conic coefficient and aspheric coefficient of each lens.

[0155] Table 4c

[0156] As shown in Table 4c, the first lens L1 to the seventh lens L7 have a total of 14 surfaces, all of which are aspherical. Among them, the surface shape z of each even-order aspherical surface satisfies:

[0157] Among them, z is the aspheric surface sag, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0158] Figure 18 shows the performance curves of lens module 20 at different spatial frequencies in this example. The solid lines in Figure 18 represent the modulation transfer function (MTF) of light at different spatial frequencies in the sagittal direction, while the dashed lines represent the MTF of light at different spatial frequencies in the tangential direction. As shown in Figure 18 , when the resolution is less than 100 lp / mm, the MTF corresponding to each curve is greater than 45%. This means that the MTF at different fields of view is high in both the sagittal and tangential directions, resulting in high imaging quality for lens module 20.

[0159] Figure 19 is an optical axial chromatic aberration diagram of the lens module 20 in this example. Different curves in Figure 19 correspond to light of different wavelengths. The vertical axis is the normalized aperture, and the horizontal axis is the defocus distance (the distance from the optical axis). It can be seen from Figure 19 that the axial chromatic aberration of the lens module 20 in this example is better.

[0160] Example 5

[0161] As shown in FIG20 , in this example, the first lens group 221 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are arranged in a direction away from the light-transmitting cover plate 211. The second lens group 222 includes a sixth lens L6 and a seventh lens L7, which are arranged in a direction away from the first lens group 221. The first lens L1, the third lens L3, the fifth lens L5, and the sixth lens L6 all have positive refractive powers, while the second lens L2, the fourth lens L4, and the seventh lens L7 all have negative refractive powers.

[0162] In some examples, when the aperture number F of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the transparent cover 211 are in the second position, the length TTL of the lens assembly 220 along the optical axis satisfies: The maximum light entrance aperture EPD of the lens module 20 and the infinite focal length EFL of the lens module 20 satisfy the following conditions: The refractive index of the first lens is ind1 = 1.855. The distance between the first lens and the second lens along the optical axis is ct = 0.04 mm. When the transparent cover plate 211 is in the first position, the distance between the first lens group 221 and the second lens group 222 along the optical axis, maxct = 2.79 mm, and the length TTL of the lens assembly 220 along the optical axis when the transparent cover plate 211 is in the second position satisfy the following relationship: The focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0163] Table 5a shows the basic parameters of the lens module 20.

[0164] Table 5a

[0165] Table 5b shows the parameters of each lens, where L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, L6 is the sixth lens, and L7 is the seventh lens. S1 is the light incident surface of the corresponding lens, and S2 is the light exit surface of the corresponding lens.

[0166] Table 5b

[0167] Table 5c shows the conic coefficient and aspheric coefficient of each lens.

[0168] Table 5c

[0169] As shown in Table 5c, the first lens L1 to the seventh lens L7 have a total of 14 surfaces, all of which are aspherical. Among them, the surface shape z of each even-order aspherical surface satisfies:

[0170] Among them, z is the aspheric surface sag, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0171] Figure 21 shows the performance curves of lens module 20 at different spatial frequencies in this example. The solid lines in Figure 21 represent the modulation transfer function (MTF) of light at different spatial frequencies in the sagittal direction, while the dashed lines represent the MTF of light at different spatial frequencies in the tangential direction. As shown in Figure 21, when the resolution is less than 100 lp / mm, the MTF corresponding to each curve is greater than 45%. This means that the MTF at different fields of view is high in both the sagittal and tangential directions, resulting in high imaging quality for lens module 20.

[0172] Figure 22 is an optical axial chromatic aberration diagram of the lens module 20 in this example. Different curves in Figure 22 correspond to light of different wavelengths. The vertical axis is the normalized aperture and the horizontal axis is the defocus distance (the distance from the optical axis). It can be seen from Figure 22 that the axial chromatic aberration of the lens module 20 in this example is better.

[0173] Example 6

[0174] Referring to Figure 23, in this example, the first lens group 221 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4, disposed away from the light-transmitting cover plate 211. The second lens group 222 includes a fifth lens L5, a sixth lens L6, and a seventh lens L7, disposed away from the first lens group 221. The first lens L1, the fourth lens L4, and the sixth lens L6 all have positive refractive powers, while the second lens L2, the third lens L3, the fifth lens L5, and the seventh lens L7 all have negative refractive powers.

[0175] In some examples, when the aperture number F of the lens module 20, the infinite focal length EFL of the lens module 20, the maximum image height IH of the optical sensor 240, and the transparent cover 211 are in the second position, the length TTL of the lens assembly 220 along the optical axis satisfies: The maximum light entrance aperture EPD of the lens module 20 and the infinite focal length EFL of the lens module 20 satisfy the following conditions: The refractive index of the first lens is ind1 = 1.754. The distance between the first lens and the second lens along the optical axis is ct = 0.05 mm. When the transparent cover plate 211 is in the first position, the distance between the first lens group 221 and the second lens group 222 along the optical axis is maxct = 2.3235 mm. This is in accordance with the length TTL of the lens assembly 220 along the optical axis when the transparent cover plate 211 is in the second position: The focal length f1 of the first lens group 221, the focal length f2 of the second lens group 222, and the focal length f of the lens assembly 220 satisfy the following relationship:

[0176] Table 6a shows the basic parameters of the lens module 20.

[0177] Table 6a

[0178] Table 6b shows the parameters of each lens, where L1 is the first lens, L2 is the second lens, L3 is the third lens, L4 is the fourth lens, L5 is the fifth lens, L6 is the sixth lens, and L7 is the seventh lens. S1 is the light incident surface of the corresponding lens, and S2 is the light exit surface of the corresponding lens.

[0179] Table 6b

[0180] Table 6c shows the conic coefficient and aspheric coefficient of each lens.

[0181] Table 6c

[0182] As shown in Table 6c, the first lens L1 to the seventh lens L7 have a total of 14 surfaces, all of which are aspherical. Among them, the surface shape z of each even-order aspherical surface satisfies:

[0183] Among them, z is the aspheric surface sag, r is the radial coordinate of the aspheric surface, c is the aspheric vertex curvature, K is the cone coefficient, and Ai represents the i-th order aspheric coefficient.

[0184] FIG24 is a performance curve diagram of the lens module 20 at different spatial frequencies in this example. The solid line in FIG24 represents the modulation transfer function (MTF) of light of different spatial frequencies in the sagittal direction, and the dotted line represents the modulation transfer function of light of different spatial frequencies in the meridional direction. As can be seen from FIG24, when the resolution is less than 100 lp / mm, the modulation transfer function corresponding to each curve is greater than 45%, that is, the modulation transfer function under different fields of view is high in both the sagittal and meridional directions, so that the lens module 20 has a higher imaging quality. FIG25 is an optical axial chromatic aberration diagram of the lens module 20 in this example. The different curves in FIG25 correspond to light of different wavelengths. The ordinate is the normalized aperture, and the abscissa is the defocus distance (the distance from the optical axis). As can be seen from FIG25, the axial chromatic aberration of the lens module 20 in this example is good.

[0185] The above description is merely a specific embodiment of the present application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A lens module, characterized in that, Comprising: An optical sensor; A lens assembly, with the optical sensor disposed on the image side of the lens assembly; The lens assembly includes a plurality of lenses arranged along the optical axis direction, and the focal length f0 of the lens among the plurality of lenses that is farther from the optical sensor and the maximum entrance pupil diameter EPD of the lens module satisfy: A focusing device, which is connected to the lens assembly for focusing.

2. The lens module according to claim 1, wherein The lens assembly includes a first lens group and a second lens group arranged along the optical axis direction, and the second lens group is located between the first lens group and the optical sensor; both the first lens group and the second lens group include at least two lenses; the optical power of the first lens group is positive, the optical power of the second lens group is negative, and the optical power of the lens assembly is positive.

3. The lens module according to claim 2, wherein The focusing device is connected to the first lens group to drive the first lens group to move along the optical axis.

4. The lens module according to claim 3, wherein The lens module further includes a lens holder, on which a light-transmitting channel is provided, the lens assembly is disposed in the light-transmitting channel, guiding columns are provided on the side wall of the light-transmitting channel, and the center line of the guiding columns is parallel to the optical axis; guiding grooves are provided on the side wall of the first lens group, and the guiding columns are slidably arranged in the guiding grooves; the focusing device is connected to the guiding grooves.

5. The lens module according to any one of claims 2-4, characterized in that, The focal length f1 of the first lens group, the focal length f2 of the second lens group, and the focal length f of the lens assembly satisfy:

6. The lens module according to any one of claims 2-5, characterized in that, The refractive index ind1 of the lens among the plurality of lenses that is far from the optical sensor satisfies: 1.6 < ind1.

7. The lens module according to any one of claims 2-6, characterized in that, The distance ct along the optical axis direction between two adjacent lenses in the first lens group that are far from the optical sensor satisfies: 0.03 mm < ct < 0.2 mm.

8. The lens module according to any one of claims 2-7, characterized in that, The first lens group includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged along the direction close to the optical sensor, and the second lens group includes a sixth lens and a seventh lens arranged along the direction away from the first lens group.

9. The lens module according to claim 8, wherein The optical powers of the first lens, the fourth lens, the fifth lens, and the sixth lens are all positive, and the optical powers of the second lens, the third lens, and the seventh lens are all negative.

10. The lens module according to claim 8, wherein The optical powers of the first lens, the fifth lens, and the sixth lens are all positive, and the optical powers of the second lens, the third lens, the fourth lens, and the seventh lens are all negative.

11. The lens module according to claim 8, wherein The optical powers of the first lens, the third lens, the fifth lens, and the sixth lens are all positive, and the optical powers of the second lens, the fourth lens, and the seventh lens are all negative.

12. The lens module according to any one of claims 2-7, characterized in that, The first lens group includes a first lens, a second lens, a third lens, and a fourth lens arranged along the direction close to the optical sensor, and the second lens group includes a fifth lens, a sixth lens, and a seventh lens arranged along the direction away from the first lens group.

13. The lens module according to claim 12, wherein The optical powers of the first lens, the fourth lens, and the sixth lens are all positive, and the optical powers of the second lens, the third lens, the fifth lens, and the seventh lens are all negative.

14. The lens module according to any one of claims 2-13, wherein The lens module further includes a light-transmitting cover plate and a driving device. The light-transmitting cover plate is disposed on the object side of the lens assembly; the driving device is connected to the light-transmitting cover plate. The driving device is configured to drive the light-transmitting cover plate to move away from the lens assembly to a first position in response to a first operation of a user, and the driving device is further configured to drive the light-transmitting cover plate to move toward the lens assembly to a second position in response to a second operation of the user.

15. The lens module according to claim 14, wherein The lens module further includes a telescopic device. The telescopic device is disposed on the object side of the lens assembly. The telescopic device is spaced apart from the lens assembly. The light-transmitting cover plate is disposed at an end of the telescopic device facing away from the lens assembly; the driving device is connected to the telescopic device to drive the telescopic device to move in a direction parallel to the optical axis.

16. The lens module according to claim 14 or 15, characterized in that, The aperture number F of the lens module, the maximum entrance pupil diameter EPD of the lens module, the infinite focal length EFL of the lens module, the maximum image height IH of the optical sensor, and the length TTL of the lens assembly along the optical axis when the light-transmitting cover plate is in the second position satisfy:

17. The lens module according to any one of claims 14-16, wherein When the light-transmitting cover plate is in the first position, the distance maxct in the optical axis direction between the first lens group and the second lens group satisfies: 5 mm > maxct > 1 mm.

18. The lens module according to any one of claims 14-17, characterized in that, When the transparent cover plate is in the first position, the distance maxct between the first lens group and the second lens group in the optical axis direction satisfies the following relationship with the length TTL of the lens assembly in the optical axis direction when the transparent cover plate is in the second position:

19. The lens module according to any one of claims 14-18, characterized in that, When the transparent cover plate is in the first position, the distance maxct between the first lens group and the second lens group in the optical axis direction satisfies the following relationship with the maximum image height IH of the optical sensor:

20. An electronic device, characterized in that, Comprising: A housing and the lens module according to any one of claims 1-13, wherein the lens module is disposed on the housing.

21. The electronic device according to claim 20, wherein The electronic device further includes a light-transmitting cover plate and a driving device. The light-transmitting cover plate is disposed on the object side of the lens assembly; the driving device is connected to the light-transmitting cover plate. The driving device is configured to drive the light-transmitting cover plate to move away from the lens assembly to a first position in response to a first operation of a user, and the driving device is further configured to drive the light-transmitting cover plate to move toward the lens assembly to a second position in response to a second operation of the user.

22. The electronic device according to claim 21, wherein The electronic device further includes a telescopic device. The telescopic device is disposed on the object side of the lens assembly. The telescopic device is spaced apart from the lens assembly. The light-transmitting cover plate is disposed at an end of the telescopic device facing away from the lens assembly; the driving device is connected to the telescopic device to drive the telescopic device to move in a direction parallel to the optical axis.

23. The electronic device according to claim 21 or 22, characterized in that, The housing defines an accommodation cavity. An opening communicating with the accommodation cavity is provided on the housing. At least a part of the lens module is disposed in the accommodation cavity. The light-transmitting cover plate is disposed opposite to the opening; the driving device is configured to drive the light-transmitting cover plate to move out of the accommodation cavity in response to a first operation of a user.

24. An electronic device, characterized in that, Comprising: A housing and the lens module according to any one of claims 14-19, wherein the lens module is disposed on the housing.

25. The electronic device according to claim 24, characterized in that, The housing defines an accommodation cavity. An opening communicating with the accommodation cavity is provided on the housing. At least a part of the lens module is disposed in the accommodation cavity. The light-transmitting cover plate is disposed opposite to the opening; the driving device is configured to drive the light-transmitting cover plate to move out of the accommodation cavity in response to a first operation of a user.

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