Lens assembly, camera module and electronic device

Abstract

A lens assembly (10), a camera module (110) and an electronic device (100), which relate to the technical field of cameras. The lens assembly (10) comprises a first lens unit (101) having a positive focal power, a second lens unit (102) having a positive focal power, and a third lens unit (103) having a negative focal power, which are arranged in sequence from an object side to an image side along an optical axis. The focal power of the three lens units is reasonably distributed, such that when the lens assembly (10) is in an operation state, the third lens unit (103) moves towards the second lens unit (102) along the optical axis, and optical continuous zooming from a first state to a second state can be achieved. During the continuous zooming from the first state to the second state, the first lens unit (101) moves away from the second lens unit (102) along the optical axis, thereby realizing focusing during the continuous zooming, enabling imaging to be always kept clear during the continuous zooming, ensuring high imaging quality of the lens assembly (10) in any focal length state during the continuous zooming, improving the imaging quality, and realizing the miniaturization design of the lens assembly (10) and the camera module (110).

Description

Lens assembly, camera module and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410467109.X, filed on April 17, 2024, and entitled "Lens assembly, camera module and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of camera, in particular to a lens assembly, a camera module and an electronic device. BACKGROUND

[0003] In recent years, camera modules have become an indispensable functional component in electronic products such as mobile phones, tablets, notebook computers and wearable devices. With the development of electronic device technology, users have increasingly high demands for the shooting performance of mobile phones and other electronic devices, such as wider zoom range and higher imaging quality. Single-focus lenses cannot meet the zooming needs of users.

[0004] Currently, the zoom of camera modules is mostly achieved by digital zooming, such as cutting and enlarging the image generated by a camera module with a fixed focal length to obtain images with different focal lengths, thereby achieving zooming effect. For example, a mobile phone includes a main camera with an equivalent focal length of 24 mm. In order to obtain a shooting image with an equivalent focal length of 35 mm, the image captured by the main camera with an equivalent focal length of 24 mm can be cut according to a cutting ratio of about 0.6857 to obtain a shooting image corresponding to a lens with an equivalent focal length of 35 mm. However, the resolution of the cut and enlarged image is significantly reduced, which affects the imaging quality. SUMMARY

[0005] The present application provides a lens assembly, a camera module and an electronic device. The lens assembly can achieve optical continuous zooming and focusing design during continuous zooming, ensuring the imaging quality of the entire focal length range and achieving high imaging quality.

[0006] A first aspect of the present application provides a lens assembly, comprising a first lens unit, a second lens unit and a third lens unit arranged in sequence along an optical axis from an object side to an image side.

[0007] The first lens unit is the lens unit closest to the object side in the lens assembly. The first lens unit has positive refractive power, which can better converge light rays and help reduce the total optical length of the lens assembly, thereby achieving miniaturization design of the lens assembly and the camera module.

[0008] The third lens unit is the lens unit closest to the image side in the lens assembly, the third lens unit has a negative focal power, and the third lens unit diverges light and irradiates the light onto the image sensor, which is conducive to reducing the back focal length and thus reducing the total optical length of the lens assembly, and is also conducive to realizing the miniaturization design of the lens assembly and the camera module.

[0009] The second lens unit has a positive focal power, and thus the lens assembly at least includes, arranged in order from the object side to the image side, the first lens unit having a positive focal power, the second lens unit having a positive focal power, and the third lens unit having a negative focal power, the focal powers of the three lens units are reasonably distributed, and the continuous zooming and focusing of the lens assembly can be realized by moving part or all of the lens units. Moreover, the second lens unit has a positive focal power, which can share part of the focal power of the first lens unit, thereby avoiding excessive aberration of the first lens unit and making it difficult to optimize the aberration of the rear end of the lens assembly (closer to the image side than the second lens unit).

[0010] The first lens unit and the third lens unit are movably arranged along the optical axis, so that the first lens unit and the third lens unit can move toward or away from the second lens unit along the optical axis.

[0011] The lens assembly includes a first state and a second state, and the focal length of the lens assembly in the first state is smaller than the focal length of the lens assembly in the second state. Moving the third lens unit toward the second lens unit along the optical axis narrows the distance between the third lens unit with a negative focal power and the second lens unit with a positive focal power, reduces the spacing between the third lens unit and the second lens unit, changes the focal length of the lens assembly, and enables the lens assembly to realize continuous zooming from the first state to the second state. Continuous zooming refers to the process of zooming the lens assembly from the first state (or the second state) to the second state (or the first state), in which the focal length of the lens assembly continuously and uninterruptedly changes, and the focal length of the lens assembly can be continuously and infinitely adjusted between the first state and the second state.

[0012] In the process of moving the third lens unit toward the second lens unit along the optical axis to realize continuous zooming of the lens assembly from the first state to the second state, the first lens unit moves away from the second lens unit along the optical axis, which widens the distance between the first lens unit with a positive focal power and the light-sensitive surface of the image sensor and increases the spacing between the first lens unit and the light-sensitive surface, thereby realizing focusing of the lens assembly in the process of continuous zooming from the first state to the second state, ensuring that the imaging remains clear during continuous zooming, and ensuring high imaging quality of the lens assembly in the first state, the second state, and any focal length state between the first state and the second state.

[0013] That is, the lens assembly of the embodiment of the present application, through the three-lens-unit architecture of the first lens unit, the second lens unit and the third lens unit, reasonably allocates the optical power, so that the optical continuous zoom design of the lens assembly between the first state and the second state is realized through the linkage of the third lens unit and the first lens unit, and the imaging quality of the lens assembly in the optical continuous zoom process is ensured, and the imaging quality is improved. The lens assembly has a small optical total length, which is beneficial to realize the miniaturization design of the lens assembly and the camera module.

[0014] In a possible implementation manner, the second lens unit is movably arranged along the optical axis, and when the lens assembly is continuously zoomed from the first state to the second state, the second lens unit moves towards the object side along the optical axis. The distance between the second lens unit and the photosensitive surface is increased, and more space is left for the third lens unit to move to realize continuous zoom, thereby increasing the zoom ratio of the lens assembly, realizing the optical continuous zoom design of the lens assembly in a longer focal length range, and ensuring the high imaging quality in the continuous zoom process in the long focal length range.

[0015] In addition, the movable arrangement of the second lens unit can improve the design freedom of the entire lens assembly, which is beneficial to improve the optical quality of the lens assembly, such as improving the freedom of the aperture and target surface design, and further improving the imaging quality.

[0016] In a possible implementation manner, the lens assembly further includes a working state and a non-working state, and when the lens assembly is in the working state, the lens assembly can realize switching between the first state and the second state.

[0017] When the lens assembly is switched from the working state to the non-working state, at least the first lens unit moves towards the image side. The distance between the first lens unit closest to the object side and the image surface is compressed, the thickness of the camera module in the non-working state is reduced, and the thinning of the lens assembly and the camera module in the non-working state is realized.

[0018] When the lens assembly is switched from the non-working state to the working state, at least the first lens unit moves away from the image side, and the optical total length required by the lens assembly when it reaches the working state is achieved, thereby meeting the imaging requirement.

[0019] In a possible implementation manner, when the lens assembly is switched from the working state to the non-working state, the first lens unit, the second lens unit and the third lens unit respectively move towards the image side. The distances between the third lens unit and the photosensitive surface, the second lens unit and the third lens unit, and the first lens unit and the second lens unit are compressed, which can further compress the distance between the first lens unit and the image surface, so that the lens assembly has a thickness as small as possible in the non-working state, the thickness of the camera module in the non-working state is significantly reduced, and the thinning of the lens assembly and the camera module in the non-working state is realized.

[0020] When the lens assembly is switched from the non-working state to the working state, the first lens unit, the second lens unit and the third lens unit move away from the image side, and the space required for the movement of the first lens unit and the third lens unit (and the second lens unit) in the switching process between the first state and the second state is satisfied.

[0021] In a possible implementation, the lens assembly further comprises a variable aperture, and the variable aperture is located on the side of the first lens unit facing the object side. The maximum aperture of the variable aperture when the lens assembly is in the first state is less than or equal to the maximum aperture of the variable aperture when the lens assembly is in the second state. The aperture of the lens assembly in the second state is increased, the light quantity of the lens assembly in the second state is improved, and the high imaging quality of the lens assembly in the second state is ensured.

[0022] In a possible implementation, the zoom ratio n of the lens assembly ranges from 1.3 to 2.5. The lens assembly has a large zoom ratio, so that the lens assembly can have a large zoom range and realize continuous zoom design in the long-focus segment.

[0023] In a possible implementation, when the lens assembly is in the working state, the lens assembly satisfies the condition formula: f1>EFL max , where f1 is the effective focal length of the first lens unit, EFL max is the effective focal length of the lens assembly at the long-focus end. The focal length of the first lens unit is long, and the refractive power of the first lens unit is reduced, which is beneficial to reducing aberration and further improving imaging quality.

[0024] In a possible implementation, when the lens assembly is in the working state, the lens assembly satisfies the condition formula: 1.0≤TTL / EFL≤2.7, where EFL is the effective focal length of the lens assembly, and TTL is the total optical length of the lens assembly. The lens assembly has a small total optical length, which is beneficial to realizing the miniaturization of the lens assembly under the condition of realizing optical continuous zoom and high-quality imaging in continuous zoom, and further meets the thinning design requirements of portable mobile electronic devices such as mobile phones.

[0025] In a possible implementation, the lens assembly further satisfies the condition formula: 1.0≤TTL min / EFL min ≤1.7, where EFL min is the effective focal length of the lens assembly at the short-focus end, and TTL min is the total optical length of the lens assembly at the short-focus end. The lens assembly has a smaller total optical length at the short-focus end, which ensures that the lens assembly can be miniaturized and better meets the thinning design requirements of electronic devices.

[0026] In a possible implementation, when the lens assembly is in a working state, the lens assembly satisfies a condition: 0.8≤IH / EFL≤1.2, where EFL is an effective focal length of the lens assembly, and IH is an image height of the lens assembly. The lens assembly has a large image height, which ensures that the lens assembly has high imaging quality and meets the high imaging quality requirement of the electronic device.

[0027] In a possible implementation, the third lens unit includes a plurality of lenses with optical power, and an image-side surface of a lens closest to the image side in the third lens unit includes at least two inflection points. The lens closest to the image side in the third lens unit can be a lens closest to the image side in the lens assembly, and the end of the lens has at least two inflection points, which is beneficial to better correct optical aberration of the edge field of view and improve the imaging quality.

[0028] In a possible implementation, the first lens unit includes at least two lenses with optical power, and the second lens unit includes at least two lenses with optical power. The light first passes through the first lens unit and the second lens unit and then enters the third lens unit, so that the first lens unit and the second lens unit each include a plurality of lenses, which can improve the design freedom of the first lens unit and the second lens unit, thereby better correcting aberration and improving the imaging quality of the lens assembly and the camera module.

[0029] In a possible implementation, the lenses of the second lens unit and the lenses of the third lens unit are plastic lenses, which is beneficial to reduce the cost of the lens assembly while ensuring the precision of the lens assembly.

[0030] In a possible implementation, the field of view angle of the lens assembly includes 100°-50°, so that the lens assembly has a large zoom range and can implement continuous optical zoom design in a longer focal length range.

[0031] A second aspect of the embodiment of the application provides a camera module, which includes at least an image sensor and the lens assembly in any of the above claims, and the image sensor is located on a side of the lens assembly facing the image side. By including the lens assembly, the lens assembly can implement optical continuous zoom and focusing during the continuous zoom process, so that the imaging is always clear during the continuous zoom process, the high imaging quality is ensured in any focal length state during the zoom process, the continuous zoom and high imaging quality of the camera module are implemented, and the low optical total length of the lens assembly and the movable lens unit are beneficial to the miniaturization design of the camera module.

[0032] A third aspect of the embodiment of the application provides an electronic device, which includes at least a shell and the camera module described above, and the shell has a receiving cavity in which at least the image sensor of the camera module is located.

[0033] A through hole is formed on one side of the shell and is in communication with the accommodating cavity. When the lens assembly of the camera module is in a working state, at least part of the lens assembly protrudes out of the accommodating cavity through the through hole. When the lens assembly of the camera module is switched from the working state to a non-working state, the first lens unit, the second lens unit and the third lens unit move along the optical axis towards the image sensor, reducing the spacing between the lens units and between the lens units and the photosensitive surface, so that the part of the lens assembly protruding out of the shell can move inwards towards the accommodating cavity of the shell. The thickness of the part of the lens assembly protruding out of the shell through the through hole is reduced, and the occupied space of the camera module as a whole in the non-working state is reduced, so that when the lens assembly is in the non-working state, even if the entire camera module is placed in the accommodating cavity of the shell, it will not greatly restrict the thickness design of the electronic device, facilitating the thinning of the electronic device and improving the appearance and shooting performance of the electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0034] FIG. 1 is a structural schematic diagram of an electronic device provided by an embodiment of the present application;

[0035] FIG. 2 is a structural schematic diagram of a lens assembly in a camera module in a working state and in a first state provided by an embodiment of the present application;

[0036] FIG. 3 is a structural schematic diagram of the lens assembly of the camera module in FIG. 2 in a working state and in a second state;

[0037] FIG. 4 is a structural schematic diagram of the lens assembly of the camera module in FIG. 3 in a non-working state;

[0038] FIG. 5 is a structural schematic diagram of a lens assembly in a camera module in a working state and in a first state provided by an embodiment one of the present application;

[0039] FIG. 6 is a structural schematic diagram of the lens assembly of the camera module in FIG. 5 in a working state and in a second state;

[0040] FIG. 7 is a modulation transfer function curve diagram of the lens assembly in the first state in FIG. 5;

[0041] FIG. 8 is a modulation transfer function curve diagram of the lens assembly in the second state in FIG. 6;

[0042] FIG. 9 is a structural schematic diagram of a lens assembly in a camera module in a working state and in a first state provided by an embodiment two of the present application;

[0043] FIG. 10 is a structural schematic diagram of the lens assembly of the camera module in FIG. 9 in a working state and in a second state;

[0044] FIG. 11 is a modulation transfer function curve diagram of the lens assembly in the first state in FIG. 9;

[0045] FIG. 12 is a modulation transfer function curve diagram of the lens assembly in the second state in FIG. 10;

[0046] FIG. 13 is a structural schematic diagram of a lens assembly in a camera module in the first state in the working state according to an embodiment of the present application;

[0047] FIG. 14 is a structural schematic diagram of the lens assembly in the camera module in the second state in the working state according to an embodiment of the present application;

[0048] FIG. 15 is a modulation transfer function curve diagram of the lens assembly in the first state in FIG. 13;

[0049] FIG. 16 is a modulation transfer function curve diagram of the lens assembly in the second state in FIG. 14.

[0050] Legend: 100-electronic device; 110-camera module; 10-lens assembly; 101-first lens unit; 102-second lens unit; 103-third lens unit; 11-first lens; 12-second lens; 13-third lens; 14-fourth lens; 15-fifth lens; 16-sixth lens; 17-seventh lens; 18-eighth lens; 19-ninth lens; 111-tenth lens; 104-variable diaphragm; 20-image sensor; 21-photosensitive surface; 30-filter; 120-housing; 121-middle frame; 122-back cover. DETAILED DESCRIPTION

[0051] The terms used in the embodiments of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0052] For ease of understanding, first, the related technical terms involved in the embodiments of the present application are explained and described.

[0053] Object side, with the lens assembly as the boundary, the side where the object is located is the object side, and the side of the lens or optical element facing the object side is the object side.

[0054] Image side, with the lens assembly as the boundary, the side where the image of the object is located is the image side, and the side of the lens or optical element facing the image side is the image side.

[0055] Optical axis, refers to the light ray passing through the center of each lens of the lens assembly (see the virtual axis L in FIG. 2).

[0056] Imaging surface, located on the image side of all lenses in the lens assembly, and the carrier surface on which the image is formed after the light ray passes through each lens of the lens assembly in sequence, in the embodiments of the present application, the imaging surface can refer to the photosensitive surface of the image sensor.

[0057] Image height (IH) refers to the total image height of the image formed by the lens assembly.

[0058] The optical power is equal to the difference between the convergence of the image side light beam and the convergence of the object side light beam, which represents the refractive ability of the lens to the incident parallel light beam.

[0059] Positive optical power means that the lens has a positive focal length and has the effect of converging light.

[0060] Negative optical power means that the lens has a negative focal length and has the effect of diverging light.

[0061] The Abbe number, also known as the dispersion coefficient, refers to the difference ratio of the refractive index of an optical material at different wavelengths, indicating the degree of dispersion of the material.

[0062] Refractive index is the ratio of the speed of light in a vacuum (air) to the speed of light in the lens material. The higher the refractive index of a lens, the greater its ability to refract incident light. The higher the refractive index, the thinner the lens. That is, for lenses with the same center thickness, the same prescription, and the same material, a lens with a higher refractive index will be thinner at the edges than a lens with a lower refractive index.

[0063] The radius of curvature is the reciprocal of the curvature. The curvature of a plane curve is the rate of rotation of the tangent direction angle at a point on the curve to the arc length. It is defined by differentiation and indicates the degree to which the curve deviates from a straight line.

[0064] Focal length, also known as focal length, is often expressed as effective focal length (EFL), distinguishing it from parameters such as front focal length and back focal length. Focal length, or effective focal length, is a measure of light convergence or divergence in an optical system. It refers to the vertical distance from the optical center of a lens or lens assembly to the focal plane, when a sharp image of an object at infinite distance is formed through the lens or lens assembly. From a practical perspective, it can be understood as the distance from the center of the lens assembly to the imaging plane.

[0065] Equivalent focal length converts the imaging angle on photosensitive surfaces of different sizes into the lens focal length corresponding to the same imaging angle on a camera (such as a 135 film camera). The converted focal length is the equivalent focal length.

[0066] The back focal length (BFL) is the length on the optical axis from the image side of the lens element closest to the image side to the imaging plane.

[0067] Zoom can change the focal length to obtain different widths of field of view, thereby achieving the effect of enlarging or reducing the scene to be photographed.

[0068] Zoom ratio, also known as zoom factor, refers to the ratio of the effective focal length at the long focal end to the effective focal length at the short focal end of the lens assembly.

[0069] Focusing refers to adjusting the focal distance when using the lens assembly to image, so as to achieve clear imaging at different object distances.

[0070] Field of view, also known as FOV, refers to the angle formed by the two edges of the maximum range of the image of the object through the lens assembly with the lens assembly as the vertex. The size of the field of view determines the field of view of the lens, and the larger the field of view, the larger the field of view.

[0071] Aperture is a device used to control the amount of light that passes through the lens or lens group (i.e. lens assembly) into the light-sensitive surface of the camera module. It is usually fixed in the camera module, and the size of the aperture can be expressed by the F# value.

[0072] F# is a relative value (the reciprocal of the relative aperture) derived from the focal length of the lens assembly / the entrance pupil diameter of the lens assembly. The smaller the F# value, the more light enters in the same unit of time, the smaller the depth of field, and the background content of the photograph will be blurred, producing an effect similar to a long focal length lens.

[0073] Light intake is the amount of light that passes through the lens or lens group and shines on the light-sensitive surface.

[0074] Total track length, also known as total height or total length, refers to the total length of the object side of the lens closest to the object side to the imaging plane on the optical axis in the lens assembly, which is the main factor in determining the height of the camera module. In this application, referring to FIG. 2, the total track length TTL can be the length of the object side of the lens closest to the object side (e.g. the first lens 11) to the light-sensitive surface of the image sensor on the optical axis.

[0075] Aberration refers to the deviation of the image formed by the lens assembly from the result obtained by paraxial optics (Gaussian optics). The deviation of the image formed by the lens assembly from the paraxial optics is called aberration.

[0076] Modulation transfer function, also known as MTF, is a measure of the quality of system imaging.

[0077] The electronic device can include, but is not limited to, a mobile phone, a tablet personal computer, a notebook computer, a camera, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a POS machine, a personal digital assistant (PDA), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, an in-vehicle device, a surveillance camera device, and the like, which can realize a photographing function.

[0078] In the embodiments of the present application, the electronic device is taken as a mobile phone as an example. The mobile phone can be a straight phone, or the mobile phone can also be a folding phone. Specifically, the electronic device is taken as a straight phone as an example for description below.

[0079] FIG. 1 is a structural schematic diagram of an electronic device provided by the embodiments of the present application.

[0080] Referring to FIG. 1, the electronic device 100 can include a housing 120 and a camera module 110. The housing 120 can serve as a main bearing structure of the electronic device 100. For example, the housing 120 can have a receiving cavity (not shown in the figure) therein, which can be used to assemble various structural components of the electronic device.

[0081] The camera module 110 is assembled with the housing 120, so that at least part of the camera module 110 can be located in the receiving cavity of the housing 120.

[0082] The camera module 110 is used to realize the function of photographing, for example, can be used to take photos and record videos, and the photographing scene can include various complex and diverse photographing application scenes, such as indoor, outdoor, person, environment, and the like.

[0083] The electronic device 100 can further include a display screen (not shown in the figure). The display screen can be fixed on one side of the housing 120, and can cover the receiving cavity of the closed housing 120 to realize the protection of the structural components in the receiving cavity.

[0084] The display screen is used to display information and provide an interactive interface for the user. The side of the display screen away from the housing 120 can serve as a display surface of the electronic device 100.

[0085] Exemplarily, as shown in FIG. 1, the shell 120 can include a middle frame 121 and a back cover 122, the middle frame 121 can be arranged on one side of the back cover 122, and the middle frame 121 can be a ring-shaped frame structure, and the back cover 122 can be a plate-shaped structure in a rectangular shape. Of course, in some other examples, the back cover 122 can also be a plate-shaped structure in a square, circular, oval, or circular-rectangular shape.

[0086] In the embodiment of the present application, for the convenience of description, as shown in FIG. 1, the thickness direction of the electronic device 100 is the z direction, and the middle frame 121 can be located on one side of the back cover 122 along the thickness direction.

[0087] The display screen can be located on the side of the middle frame 121 away from the back cover 122, that is, along the thickness direction, the display screen and the back cover 122 are fixed on the opposite sides of the middle frame 121 respectively. The back cover 122 can serve as an appearance cover of the back of the electronic device 100.

[0088] The back cover 122 can be a metal back cover, a glass back cover, a plastic back cover, or a ceramic back cover, and the material of the back cover 122 is not limited in the embodiment of the present application.

[0089] In the embodiment of the present application, the side of the electronic device 100 where the display screen is away from the back cover 122 is the front of the electronic device 100, and the side of the back cover 122 away from the display screen is the back of the electronic device 100. The camera module 110 can be a front camera lens, and the light entrance side of the camera module 110 can be located on the front of the electronic device 100.

[0090] Alternatively, the camera module 110 can also be a rear camera lens, and the light entrance side of the camera module 110 can be located on the back of the electronic device 100. For example, a through hole (not labeled in the figure) can be formed on the back cover 122, which can be in communication with the accommodating cavity in the shell 120. The camera module 110 located in the accommodating cavity of the shell 120 can partially protrude out of the through hole on the back cover 122 to the outside of the accommodating cavity, so that light can irradiate into the camera module 110. Alternatively, the camera module 110 can also be located in the accommodating cavity of the shell 120, and light can irradiate into the camera module 110 through the through hole on the back cover 122.

[0091] The number of camera modules 110 included in the electronic device 100 can be one, or the number of camera modules 110 can also be multiple to meet different shooting requirements.

[0092] The electronic device 100 can further include other structures. For example, referring to FIG. 1, the electronic device 100 can further include a speaker hole 130 formed in the housing 120, and the speaker hole 130 can be used to play audio of the electronic device 100. An audio output device (not shown) can be disposed in the accommodating cavity of the housing 120, and the audio output device can be used to form sound, and the audio output device can be in communication with the speaker hole 130 so that the sound can be transmitted through the speaker hole 130.

[0093] The electronic device 100 can further include a data interface 140 formed in the housing 120, and a control circuit board (not shown) can be disposed in the accommodating cavity of the housing 120 and connected to the data interface 140. The data interface 140 can be used to supply power to the electronic device 100, or the data interface 140 can be used to connect the electronic device 100 to a headset, an external multimedia device (such as an external camera or an external projection device), and the like.

[0094] It can be understood that the structures shown in the embodiments of the present application do not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 can include more or fewer components than shown, or combine certain components, or split certain components, or different component arrangements. For example, the electronic device 100 can further include sensors, processors, drive structures, flashlights, and the like.

[0095] At present, due to the space constraints, the number of camera modules mounted on the shell of a mobile terminal such as a mobile phone is limited, and a single focal length camera module is difficult to meet the different field of view shooting needs of users, so the camera module usually adopts a variable focal length zoom design. One common zoom method is digital zoom, which crops and enlarges the image generated by the fixed focal length camera module to obtain a shooting image of other focal lengths, achieving the effect of zoom shooting. However, the resolution of the cropped image is significantly reduced. For example, if a camera module with an equivalent focal length of 24mm is used to generate a shooting image with an equivalent focal length of 35mm, the cropping ratio is 0.6857, and the image resolution is about 0.47 times that of the original, greatly reducing the imaging quality.

[0096] In addition, electronic devices are gradually developing towards thin and light, and the demand for thinning design of camera modules is increasing, and the low optical total length design of the lens assembly in the camera module is particularly important. Therefore, there is an urgent need for a lens assembly and a camera module that can achieve optical continuous zoom and ensure high imaging quality, and also meet the miniaturization design requirements.

[0097] Based on this, the embodiment of the present application provides a camera module, the lens assembly of the camera module is reasonably allocated with the focal length of three lens units by including the first lens unit with positive focal length, the second lens unit with positive focal length and the third lens unit with negative focal length, so that when the lens assembly is in a working state, the third lens unit moves along the optical axis towards the second lens unit, the distance between the third lens unit with negative focal length and the second lens unit with positive focal length is shortened, the focal length of the lens assembly is changed, and the lens assembly can realize optical continuous zooming from a first state (such as a short-focus state) to a second state (such as a long-focus state). And in the process of continuous zooming of the lens assembly from the first state to the second state, the first lens unit moves along the optical axis away from the second lens unit, the distance between the first lens unit with positive focal length and the image sensor is lengthened, the focusing of the lens assembly in the process of continuous zooming from the first state to the second state is realized, so that the imaging in the process of continuous zooming is always clear, and the high imaging quality of the lens assembly at any focal length state in the process of continuous zooming is ensured. That is, the lens assembly of the embodiment of the present application reasonably allocates the focal length through the three-lens-unit architecture of the first lens unit, the second lens unit and the third lens unit, so that the optical continuous zooming design of the lens assembly between the first state and the second state is realized through the linkage of the third lens unit and the first lens unit, and the imaging quality of the lens assembly in the process of optical continuous zooming is ensured, and the imaging quality is improved. In addition, the lens assembly also has a small optical total length, which is beneficial to realize the miniaturization design of the lens assembly and the camera module.

[0098] The camera module provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0099] FIG. 2 is a structural schematic diagram of a lens assembly in a camera module provided by an embodiment of the present application in a working state and located at a first state.

[0100] Referring to FIG. 2, the camera module 110 includes a lens assembly 10 and an image sensor 20, wherein the image sensor 20 can be located on the side of the lens assembly 10 facing the image side, that is, the lens assembly 10 can be located between the object to be photographed and the image sensor 20, and the light-sensitive surface 21 (which can also be referred to as an imaging surface) of the image sensor 20 can face the lens assembly 10.

[0101] The light reflected by the object to be photographed enters the camera module 110, forms an image after passing through the lens assembly 10 and irradiates onto the light-sensitive surface 21 of the image sensor 20, the light-sensitive surface 21 of the image sensor 20 receives the optical image and converts it into an image electrical signal output, thereby realizing the functions such as photographing or video shooting of the camera module 110.

[0102] To ensure the photosensitivity of the image sensor 20, at least the image sensor 20 is located in the accommodating cavity inside the shell 120 of the electronic device 100. For example, the camera module 110 is a front camera, and the lens assembly 10 can be located on the side of the image sensor 20 facing the display screen. For example, the camera module 110 is a rear camera, and the lens assembly 10 can be located on the side of the image sensor 20 away from the display screen.

[0103] The image sensor 20 can be a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Alternatively, it can also be other devices capable of realizing photoelectric conversion function.

[0104] Continuing to refer to FIG. 2, the camera module 110 can further include a filter 30, which can be located between the lens assembly 10 and the image sensor 20. With the optical axis L in FIG. 2, it can be understood that, to facilitate the reception of light during shooting, the optical axis L of the lens assembly 10 can be consistent with the thickness direction of the electronic device 100. Along the direction of the optical axis L from the object side to the image side, the lens assembly 10, the filter 30, and the image sensor 20 are arranged in sequence, and the light entering the camera module 110 passes through the lens assembly 10 and the filter 30 in sequence and then irradiates the light-sensitive surface 21 of the image sensor 20.

[0105] The filter 30 has a filtering effect, which can allow light in a specific wavelength range to pass through, thereby filtering stray light that is not conducive to imaging and improving the imaging quality.

[0106] The camera module 110 can further include an image processor, a memory, etc. (not shown in the figure), and the image sensor 20 can transmit the converted electrical signal to the image processor, the memory, etc. for processing and then transmit to the electronic device, and then realize the display of the image of the photographed object through the display screen of the electronic device.

[0107] Of course, in some other examples, the camera module 110 can further include other structural members, such as detection sensors, driving structures, and circuit boards, etc.

[0108] The lens assembly 10 can include a plurality of lens units, which can be arranged in sequence along the optical axis from the object side to the image side. Each lens unit can include a plurality of lens components with optical power.

[0109] For example, as shown in FIG. 2, the lens assembly 10 can include three lens units, such as a first lens unit 101, a second lens unit 102, and a third lens unit 103, which are arranged in order from the object side to the image side along the optical axis L, that is, among the three lens units, the first lens unit 101 is the lens unit closest to the object side in the lens assembly 10, and the third lens unit 103 is the lens unit closest to the image side in the lens assembly 10. The first lens unit 101, the second lens unit 102, and the third lens unit 103 can each be composed of a plurality of lenses having optical power.

[0110] Of course, in some examples, the lens assembly 10 can also include a fourth lens unit, which can be located on the side of the third lens unit 103 facing the image side, that is, the first lens unit 101, the second lens unit 102, the third lens unit 103, and the fourth lens unit are arranged in order from the object side to the image side along the optical axis. The number of the fourth lens unit can be one, or the number of the fourth lens unit can also be multiple.

[0111] In the embodiments of the present application, the lens assembly 10 includes the first lens unit 101, the second lens unit 102, and the third lens unit 103 as an example.

[0112] The number of lenses having optical power included in each lens unit can be multiple, and the multiple lenses are arranged in order along the optical axis L, and the air gap between the adjacent two lenses in each lens unit is fixed during the continuous zooming of the lens assembly. For example, as shown in FIG. 2, the first lens unit 101 can include a plurality of lenses having optical power, such as the first lens unit 101 including four lenses having optical power, such as a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14, which can be arranged in order from the object side to the image side along the optical axis. During the continuous zooming of the lens assembly, the adjacent two lenses can have a fixed air gap, and the gap distance can be selected and set according to the optical requirements, optical power distribution, etc. of the first lens unit 101.

[0113] The second lens unit 102 can also include a plurality of lenses having optical power, such as the second lens unit 102 including four lenses having optical power, such as a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18, which can also be arranged in order from the object side to the image side along the optical axis. During the continuous zooming of the lens assembly, the adjacent two lenses can have a fixed air gap.

[0114] The third lens unit 103 can also include multiple lenses with optical power. For example, the third lens unit 103 includes two lenses with optical power, i.e., the ninth lens 19 and the tenth lens 111, which are arranged in order along the optical axis from the object side to the image side. During the continuous zooming process of the lens assembly, there can be a fixed air gap between the two adjacent lenses. That is, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, the eighth lens 18, the ninth lens 19, and the tenth lens 111 are arranged in order along the optical axis L from the object side to the image side.

[0115] Of course, in some other examples, the first lens unit 101 can include only one lens, the second lens unit 102 can also include only one lens, and the third lens unit 103 can also include only one lens. Alternatively, only some of the first lens unit 101, the second lens unit 102, and the third lens unit 103 include one lens, and some of the lens units include multiple lenses.

[0116] In some examples, the first lens unit 101 can include multiple lenses with optical power, and the second lens unit 102 can include multiple lenses with optical power, i.e., the first lens unit 101 and the second lens unit 102 each include at least two lenses with optical power. This can improve the design freedom of the first lens unit 101 and the second lens unit 102, thereby better correcting aberrations and improving the imaging quality of the lens assembly 10 and the camera module 110.

[0117] For example, the lens assembly 10 can also include a lens barrel (not shown in the figure). The lens barrel can serve as the main load-bearing structure of the lens assembly 10, and the multiple lens units can be arranged in the lens barrel. The optical axis of the lens assembly 10 can coincide with the central axis of the lens barrel. A light passage hole can be formed on the opposite ends of the lens barrel along the optical axis to allow light to enter the lens barrel and pass through the lens assembly 10, or to allow light to pass through the lens assembly 10 to be incident on the image sensor 20.

[0118] The lens assembly 10 can also include a diaphragm 104. The diaphragm 104 can be located on the side of the first lens unit 101 facing the object side, i.e., the diaphragm 104 can be arranged closer to the object side than the first lens unit 101, the second lens unit 102, and the third lens unit 103. For example, the diaphragm 104 can be fixed to the lens closest to the object side in the first lens unit 101, such as the first lens 11.

[0119] The light rays entering the lens assembly 10 can first pass through the diaphragm 104, and then pass through the first lens unit 101, the second lens unit 102 and the third lens unit 103 in sequence, and then exit and irradiate on the photosensitive surface 21 of the image sensor 20 through the filter 30. The diaphragm 104 can limit the light rays entering the lens assembly 10 to adjust the intensity of the light rays, and can be used to control the amount of light entering the lens assembly 10.

[0120] In the embodiments of the present application, the lens assembly 10 can include a working state and a non-working state. For example, when the camera module 110 is used to implement shooting, the lens assembly 10 is in the working state to realize imaging. When the camera module 110 is not used to implement shooting, the lens assembly 10 is in the non-working state.

[0121] For example, the electronic device is a mobile phone, and the mobile phone includes the camera module 110 which can realize continuous zooming. For example, when the user opens the shooting function of the mobile phone (for example, by clicking the camera application on the display page of the display screen of the mobile phone), the lens assembly 10 is switched to the working state, and the lens assembly 10 is used for imaging when the lens assembly 10 is in the working state, so that the camera module 110 can realize the continuous zooming function. When the user closes or exits the shooting function of the mobile phone (for example, closes or exits the camera), the lens assembly 10 is switched to the non-working state, and the lens assembly 10 is not used for imaging when the lens assembly 10 is in the non-working state, so that the camera module 110 does not realize the shooting function.

[0122] Alternatively, the mobile phone can also include other camera modules 110 to realize other camera functions (such as macro function, etc.), so as to enrich the camera functions of the mobile phone. When the user opens the shooting function of the mobile phone (for example, by clicking the camera) and switches to the continuous zooming mode, the lens assembly 10 is switched to the working state, and the lens assembly 10 is used for imaging when the lens assembly 10 is in the working state, so that the camera module 110 realizes the shooting function. When the user closes or exits the continuous zooming mode and switches to other camera modules 110 to realize other camera functions, or closes or exits the shooting function (for example, closes or exits the camera), the lens assembly 10 is switched to the non-working state, and the lens assembly 10 is not used for imaging when the lens assembly 10 is in the non-working state, so that the camera module 110 does not realize the shooting function.

[0123] The first lens unit 101 has positive refractive power, is the lens unit closest to the object side in the lens assembly 10, and light passing through the diaphragm first enters the first lens unit 101, so that the first lens unit 101 has positive refractive power, can better converge light, and is beneficial to reducing the total optical length of the lens assembly 10 and realizing the miniaturized design of the lens assembly 10 and the camera module 110.

[0124] To further miniaturize the camera module 110, the third lens unit 103 has negative refractive power, can be the lens unit closest to the image side in the lens assembly 10, so that the third lens unit 103 has negative refractive power, and the third lens unit 103 diverges light and irradiates the light onto the image sensor 20. In combination with the first lens unit 101 and the second lens unit 102, a positive-negative telephoto type light path can be realized, which is beneficial to reducing the back focal length, that is, reducing the length on the optical axis between the lens closest to the image side in the third lens unit 103 (for example, the tenth lens 111 in FIG. 2) and the light-sensitive surface 21 of the image sensor 20, thereby reducing the total optical length of the lens assembly 10 and facilitating the miniaturized design of the lens assembly 10 and the camera module 110.

[0125] The second lens unit 102 has positive refractive power, so that the lens assembly 10 at least includes the first lens unit 101 having positive refractive power, the second lens unit 102 having positive refractive power, and the third lens unit 103 having negative refractive power arranged in order from the object side to the image side, the lens assembly 10 has an architecture of at least three lens units, and the refractive powers of the three lens units are reasonably distributed, so that continuous zooming and focusing of the lens assembly 10 can be realized by moving part or all of the lens units.

[0126] The second lens unit 102 has positive refractive power, which can share part of the refractive power of the first lens unit 101, avoid the first lens unit 101 from generating excessive aberration, and avoid the difficulty in optimizing the aberration of the rear end of the lens assembly 10 (closer to the image side than the second lens unit 102, for example, the third lens unit).

[0127] It should be noted that, in the embodiments of the present application, the refractive powers of the lenses in the lens assembly are not limited, and the first lens unit 101 as a whole has positive refractive power, the second lens unit 102 as a whole has positive refractive power, and the third lens unit 103 as a whole has negative refractive power.

[0128] Specifically, the first lens unit 101 is movably arranged along the optical axis, that is, all the lenses of the first lens unit 101 can move along the optical axis L towards the second lens unit 102 (or the image side) or away from the second lens unit 102 (or the image side).

[0129] The third lens unit 103 is also movably arranged along the optical axis, i.e. all the lenses of the third lens unit 103 can move along the optical axis L towards (or towards the image side) or away from (or away from the image side) the second lens unit 102.

[0130] The change of the focal length of the lens assembly 10 can be achieved by the movement of the third lens unit 103 with negative focal length, and the clear imaging of the lens assembly 10 at different object distances and different focal lengths can be achieved by the movement of the first lens unit 101 with positive focal length, i.e. focusing.

[0131] For example, when the lens assembly 10 is in the working state, the lens assembly 10 can include a second state and a first state, wherein the first state and the second state are two states of the lens assembly 10 in the zooming process, the first state refers to the state of the lens assembly 10 with a relatively small focal length in the two states, which can also be called a short-focus state. The second state refers to the state of the lens assembly 10 with a relatively large focal length in the two states, which can also be called a long-focus state. That is, the focal length of the lens assembly 10 in the first state is smaller than the focal length of the lens assembly 10 in the second state.

[0132] The zooming process of the lens assembly 10 can be the process of switching the lens assembly 10 from the first state (short-focus state) with a small focal length to the second state (long-focus state) with a large focal length, or the process of switching the lens assembly 10 from the second state (long-focus state) to the first state (short-focus state).

[0133] For example, as shown in FIG. 2, when the lens assembly 10 is in the first state, there is a distance between the first lens unit 101 and the second lens unit 102. It should be noted that in the embodiments of the present application, the distance between the lens units and the distance between the lens unit and the photosensitive surface 21 refer to the distance on the optical axis L of the air gap between the lens units and the photosensitive surface 21. For example, taking the first lens unit 101 and the second lens unit 102 as an example, the distance between the first lens unit 101 and the second lens unit 102 is the distance on the optical axis L between the side of the lens in the first lens unit 101 closest to the second lens unit 102 facing the second lens unit 102 and the side of the lens in the second lens unit 102 closest to the first lens unit 101 facing the first lens unit 101. As shown in FIG. 2, taking the first lens unit 101 including the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 arranged in sequence, and the second lens unit 102 including the fifth lens 15, the sixth lens 16, the seventh lens 17, and the eighth lens 18 arranged in sequence as an example, the distance between the first lens unit 101 and the second lens unit 102 is the distance on the optical axis L between the image side of the fourth lens 14 and the object side of the fifth lens 15, as shown by L12 in FIG. 2.

[0134] There is also a distance between the second lens unit 102 and the third lens unit 103, which is the distance on the optical axis L between the side of the lens in the second lens unit 102 closest to the third lens unit 103 facing the third lens unit 103 and the side of the lens in the third lens unit 103 closest to the second lens unit 102 facing the second lens unit 102. As shown in FIG. 2, taking the third lens unit 103 including the ninth lens 19 and the tenth lens 111 as an example, the distance between the second lens unit 102 and the third lens unit 103 is the distance on the optical axis L between the image side of the eighth lens 18 and the object side of the ninth lens 19, as shown by L23 in FIG. 2.

[0135] There is also a distance between the first lens unit 101 and the photosensitive surface 21, which is the distance on the optical axis L between the side of the lens in the first lens unit 101 closest to the photosensitive surface 21 facing the photosensitive surface 21 and the photosensitive surface 21. As shown in FIG. 2, the distance between the first lens unit 101 and the photosensitive surface 21 is the distance on the optical axis L between the image side of the fourth lens 14 and the photosensitive surface 21, as shown by L1 in FIG. 2.

[0136] It should be noted that the distances between the first lens unit 101 and the second lens unit 102, between the second lens unit 102 and the third lens unit 103, and between the first lens unit 101 and the photosensitive surface 21 when the lens assembly 10 is in the first state can be selected and set according to the focal length requirements of the lens assembly 10 in the first state.

[0137] Fig. 3 is a structural schematic diagram of the lens assembly of the camera module in Fig. 2 in a working state and located in the second state.

[0138] The third lens unit 103 can move along the optical axis towards the second lens unit 102, i.e. the third lens unit 103 moves away from the image side along the optical axis L, which, as shown in Fig. 3, shortens the distance between the third lens unit 103 with negative focal power and the second lens unit 102 with positive focal power, reduces the spacing between the third lens unit 103 and the second lens unit 102, changes the focal length of the lens assembly 10, and enables the lens assembly 10 to realize continuous zooming from the first state to the second state.

[0139] Continuous zooming refers to the process of zooming the lens assembly 10 from the first state (or the second state) to the second state (or the first state), in which the focal length of the lens assembly 10 changes continuously and uninterruptedly, and the focal length of the lens assembly 10 can be continuously and infinitely adjusted between the first state and the second state.

[0140] For example, taking the effective focal length of the lens assembly 10 as 8.8 mm when the lens assembly 10 is located in the first state and 12.8 mm when the lens assembly 10 is located in the second state, in the process of zooming the lens assembly 10 from the focal length of 8.8 mm in the first state to the focal length of 12.8 mm in the second state, the focal length of the lens assembly 10 changes continuously and uninterruptedly, and the focal length of the lens assembly 10 is continuously and infinitely adjusted in the range of 8.8 mm to 12.8 mm, such as the focal length of the lens assembly 10 can be changed from 8.8 mm to 8.9 mm, 9.0 mm, 9.1 mm, 9.2 mm, 9.3 mm, …, 12.7 mm, 12.8 mm.

[0141] In the process of moving the third lens unit 103 along the optical axis L towards the second lens unit 102 to realize continuous zooming of the lens assembly 10 from the first state to the second state, as shown in Figs. 2 and 3, the first lens unit 101 can move along the optical axis L away from the second lens unit 102, which lengthens the distance between the first lens unit 101 with positive focal power and the light-sensitive surface 21 of the image sensor 20, and increases the spacing between the first lens unit 101 and the light-sensitive surface 21, thereby realizing focusing of the lens assembly 10 in the process of continuous zooming from the first state to the second state, so that the imaging remains clear during the continuous zooming process, and the high imaging quality of the lens assembly 10 in the first state, the second state and any focal length state between the first state and the second state is ensured.

[0142] That is, the lens assembly 10 of the embodiment of the present application, through the three-lens-unit architecture of the first lens unit 101, the second lens unit 102 and the third lens unit 103, reasonably allocates the optical power, and through the linkage of the third lens unit 103 and the first lens unit 101, realizes the optical continuous zoom design of the lens assembly 10 between the first state and the second state, and ensures the imaging quality of the lens assembly 10 in the continuous zoom process, and improves the imaging quality. In addition, the design of the first lens unit 101 with positive optical power and the third lens unit 103 with negative optical power can effectively reduce the optical total length of the lens assembly 10, and meet the miniaturization design of the lens assembly 10 and the camera module 110.

[0143] For example, when the third lens unit 103 and the first lens unit 101 move to realize continuous zooming and focusing during the continuous zooming process, the second lens unit 102 can be fixed, that is, all the lenses of the second lens unit 102 can be fixed and do not move, and the distance between the second lens unit 102 and the photosensitive surface 21 can be fixed. It is beneficial to reduce the complexity of the design of the driving structure for realizing the movement of the lens unit and reduce the cost.

[0144] Referring to FIG. 3, when the lens assembly 10 is in the second state, the distance between the first lens unit 101 and the second lens unit 102 becomes L21, that is, the distance between the image side surface of the fourth lens 14 and the object side surface of the fifth lens 15 on the optical axis L is L21, the distance between the second lens unit 102 and the third lens unit 103 becomes L32, that is, the distance between the image side surface of the eighth lens 18 and the object side surface of the ninth lens 19 on the optical axis L is L32, and the distance between the first lens unit 101 and the photosensitive surface 21 becomes L2, that is, the distance between the image side surface of the fourth lens 14 and the photosensitive surface 21 on the optical axis L is L2.

[0145] It should be noted that when the lens assembly 10 is in the second state, the distance between the first lens unit 101 and the second lens unit 102, the distance between the second lens unit 102 and the third lens unit 103, and the distance between the first lens unit 101 and the photosensitive surface 21 can be selected and set according to the focal length requirement of the lens assembly 10 in the first state, the zoom ratio of the lens assembly 10, etc.

[0146] The interval L12 between the first lens unit 101 and the second lens unit 102 when the lens assembly 10 is in the first state is less than the interval L21 between the first lens unit 101 and the second lens unit 102 when the lens assembly 10 is in the second state. The interval L23 between the second lens unit 102 and the third lens unit 103 when the lens assembly 10 is in the first state is greater than the interval L32 between the second lens unit 102 and the third lens unit 103 when the lens assembly 10 is in the second state. The interval L1 between the first lens unit 101 and the photosensitive surface 21 when the lens assembly 10 is in the first state is less than the interval L2 between the first lens unit 101 and the photosensitive surface 21 when the lens assembly 10 is in the second state.

[0147] It can be understood that the reverse movement of the first lens unit 101 and the third lens unit 103 can also achieve continuous zooming and focusing during the continuous zooming process. For example, when the third lens unit 103 moves away from the second lens unit 102 along the optical axis L, i.e., the third lens unit 103 moves towards the image side along the optical axis L, the interval between the third lens unit 103 and the second lens unit 102 is increased, which can make the lens assembly 10 achieve continuous zooming from the second state to the first state.

[0148] During the continuous zooming process of the lens assembly 10 from the second state to the first state by moving the third lens unit 103 away from the second lens unit 102 along the optical axis L, the first lens unit 101 moves towards the second lens unit 102 along the optical axis L, which reduces the interval between the first lens unit 101 and the image sensor 20, and can achieve focusing of the lens assembly 10 during the continuous zooming process from the second state to the first state, so that the imaging during the continuous zooming process is always clear and high imaging quality is ensured.

[0149] It can be understood that the lens assembly 10 can achieve continuous zooming from the first state (or the second state) to the second state (or the first state), and the lens assembly 10 has a certain zooming range in which continuous zooming can be achieved. The zooming range can be selected and set according to actual design requirements, optical properties of the lenses of the lens assembly 10, and the like. The focal length of the lens assembly 10 when the lens assembly 10 is in the first state and the second state is within the zooming range.

[0150] The lens assembly 10 also includes a long focal end and a short focal end. The lens assembly 10 at the short focal end refers to a state in which the lens assembly 10 has the minimum focal length within the zooming range that the lens assembly 10 can achieve. The lens assembly 10 at the long focal end refers to a state in which the lens assembly 10 has the maximum focal length within the zooming range that the lens assembly 10 can achieve.

[0151] It can be understood that the first state of the lens assembly 10 can be a state of the lens assembly 10 at the short focal end, and the second state of the lens assembly 10 can also be a state of the lens assembly 10 at the long focal end. Alternatively, the first state can also be any focal length state of the lens assembly 10 between the short focal end and the long focal end (excluding the long focal end and the short focal end), and the second state can be any focal length state of the lens assembly 10 between the short focal end and the long focal end (excluding the long focal end and the short focal end).

[0152] For example, taking the lens assembly 10 that can achieve continuous zooming with an effective focal length in the range of 8.8mm-12.8mm as an example, when the lens assembly 10 is at the short focal end, the effective focal length of the lens assembly 10 is 8.8mm, and when the lens assembly 10 is at the long focal end, the effective focal length of the lens assembly 10 is 12.8mm. When the lens assembly 10 is in the first state, the effective focal length of the lens assembly 10 can be 8.8mm, or the effective focal length of the lens assembly 10 can also be any value between 8.8mm and 12.8mm (excluding 8.8mm and 12.8mm). When the lens assembly 10 is in the second state, the effective focal length of the lens assembly 10 can be 12.8mm, or the effective focal length of the lens assembly 10 can also be any value between 8.8mm and 12.8mm (excluding 8.8mm and 12.8mm).

[0153] It should be noted that when the lens assembly 10 is in a working state, such as when the shooting function is turned on or the shooting function is turned on and switched to a continuous zoom mode, the camera module 110 can have a default state, which can be any focal length state in the zoom range that the lens assembly 10 can achieve. From the default state, the lens assembly 10 can be switched from the first state to the second state, such as the default state can be that the lens assembly 10 of the camera module 110 is in the first state (or the short focal end), and the user can selectively continuously zoom the lens assembly 10 from the first state to the second state according to the shooting requirements by operation (such as sliding the focal length indication bar displayed on the display, zooming in or out the current image presented, etc.). From the default state, the lens assembly 10 can also be switched from the second state to the first state, such as the default state can also be that the lens assembly 10 is in the second state (or the long focal end), and the user can selectively continuously zoom the lens assembly 10 from the second state to the first state according to the requirements.

[0154] Alternatively, in some examples, the second lens unit 102 is also movably arranged, such as the second lens unit 102 can also move along the optical axis, that is, all the lenses of the second lens unit 102 can move along the optical axis L towards the first lens unit 101 (or the object side) or towards the third lens unit 103 (or the image side).

[0155] When the lens assembly 10 is continuously zoomed from the first state to the second state, the second lens unit 102 can move along the optical axis towards the object side (or the first lens unit 101), which pulls away the distance between the second lens unit 102 and the photosensitive surface 21, leaving more space for the third lens unit 103 to move to realize continuous zooming, so that the third lens unit 103 can have a larger moving zooming stroke, increasing the zoom ratio of the lens assembly 10, the lens assembly 10 has a larger zoom range, realizing the optical continuous zooming design of the longer focal length range of the lens assembly 10, and ensuring the high imaging quality in the continuous zooming process of the longer focal length range.

[0156] In addition, the movable arrangement of the second lens unit 102 can improve the design freedom of the entire lens assembly, which is beneficial to improve the optical quality of the lens assembly 10, such as improving the freedom of aperture and target surface design, and further improving the imaging quality.

[0157] For example, the zoom ratio n of the lens assembly 10 can be in the range of 1.3≤n≤2.5, where the effective focal length of the lens assembly 10 at the long focal end is EFL max , and the effective focal length of the lens assembly 10 at the short focal end is EFL min , i.e. n = EFL max / EFL min , so that n satisfies the above range, the lens assembly 10 has a larger zoom ratio, so that the lens assembly 10 can have a larger zoom range, realizing the continuous zooming design of the longer focal length range.

[0158] The field of view of the lens assembly 10 can be 100°-50°, so that the lens assembly 10 has a larger zoom range, such as realizing the continuous optical zooming design of the longer focal length range with an equivalent focal length of 24mm-45mm. The lens assembly 10 can be well applied to continuous zooming shooting in "human photography" scenes such as street shooting and landscape shooting, improving the imaging quality and use experience. The lens assembly 10 and the camera module 110 can be used as the main camera lens of an electronic device.

[0159] As described above, when the lens assembly 10 is in a working state, such as when the continuous zooming lens is used for shooting, there is a distance between the first lens unit 101 and the second lens unit 102, there is a distance between the second lens unit 102 and the third lens unit 103, and there is also a certain distance between the third lens unit 103 and the photosensitive surface 21, which ensures the total length of the lens assembly 10 to meet the imaging requirements of the lens assembly 10. At this time, the length of the lens assembly 10 and the camera module 110 along the optical axis is relatively long, and the thickness of the camera module 110 is relatively thick.

[0160] When the lens assembly 10 switches from the working state to the non-working state, such as when the shooting function is closed or exited or switched to other camera modules for shooting, at least the first lens unit 101 moves along the optical axis towards the photosensitive surface 21 (image side), which can compress the distance between the first lens unit 101 closest to the object side and the photosensitive surface 21, reduce the thickness of the lens assembly 10 in the non-working state, and achieve the thinning of the lens assembly 10 and the camera module 110 in the non-working state.

[0161] Conversely, when the lens assembly 10 switches from the non-working state to the working state, such as when the shooting function is opened or the camera function is opened and switched to the continuous zoom mode, at least the first lens unit 101 moves along the optical axis away from the photosensitive surface 21 (image side), so that the first lens unit 101 has a certain distance from the photosensitive surface 21, which meets the required total optical length for imaging.

[0162] It should be noted that the lens assembly 10 can only move the first lens unit 101 along the optical axis to switch between the working state and the non-working state, and the second lens unit 102 and the third lens unit 103 remain stationary.

[0163] Alternatively, in some examples, when the lens assembly 10 switches between the working state and the non-working state, one or both of the second lens unit 102 and the third lens unit 103 can also move.

[0164] It can be understood that since at least the first lens unit 101 and the third lens unit 103 are movable in the working state of the lens assembly 10 to achieve zooming and focusing, i.e., the distance between at least the first lens unit 101 and the third lens unit 103 and the photosensitive surface 21 is variable. When the lens assembly 10 switches between the working state and the non-working state, the movement distance of the first lens unit 101 during the switching process and whether the second lens unit 102 and the third lens unit 103 move can be selected and set according to the specific state of the lens assembly 10 in the working state.

[0165] For example, when the lens assembly 10 switches from the non-working state to the working state, such as when the shooting function is opened or the camera function is opened and switched to the continuous zoom mode, the lens assembly 10 is in a default state, which can be in the first state (such as the short focus end) or in the second state (such as the long focus end). During the switching process of the lens assembly 10 from the non-working state to the working state, the movement distance of the first lens unit 101 and whether the second lens unit 102 and the third lens unit 103 move can be selected and set according to the required distance between the lens units and the photosensitive surface 21 in the non-working state and the distance between the lens units and the photosensitive surface 21 in the default state of the lens assembly 10.

[0166] Correspondingly, when the lens assembly 10 is switched from the working state to the non-working state, such as when the shooting function is turned off or exited or switched to other camera modules for shooting, the lens assembly 10 can be in the first state or the second state before the switching. During the switching process of the lens assembly 10 from the current working state to the non-working state, the moving distance of the first lens unit 101 and whether the second lens unit 102 and the third lens unit 103 move can be selected and set according to the specific state (such as the first state or the second state) of the lens assembly 10 before the switching and the required distance between the lens units and the photosensitive surface 21 when the lens assembly 10 is in the non-working state.

[0167] FIG. 4 is a structural schematic view of the lens assembly of the camera module in FIG. 3 in a non-working state.

[0168] For example, when the lens assembly 10 is switched from the working state to the non-working state, as shown in FIGS. 2 and 4, if the lens assembly 10 before the switching is in the first state (such as the short-focus end) in FIG. 2, when the lens assembly 10 is switched from the first state to the non-working state shown in FIG. 4, the first lens unit 101 and the second lens unit 102 can be moved towards the photosensitive surface 21, and the third lens unit 103 can remain stationary.

[0169] For example, when the lens assembly 10 is switched from the working state to the non-working state, as shown in FIGS. 2 and 4, if the lens assembly 10 before the switching is in the first state (such as the short-focus end) in FIG. 2, when the lens assembly 10 is switched from the first state to the non-working state shown in FIG. 4, the first lens unit 101 and the second lens unit 102 can be moved towards the photosensitive surface 21, and the third lens unit 103 can remain stationary.

[0170] Correspondingly, when the lens assembly 10 is switched from the working state to the non-working state, such as when the shooting function is turned off or exited or switched to other camera modules for shooting, the lens assembly 10 can be in the first state or the second state before the switching. During the switching process of the lens assembly 10 from the current working state to the non-working state, the moving distance of the first lens unit 101 and whether the second lens unit 102 and the third lens unit 103 move can be selected and set according to the specific state (such as the first state or the second state) of the lens assembly 10 before the switching and the required distance between the lens units and the photosensitive surface 21 when the lens assembly 10 is in the non-working state.

[0171] For example, when the lens assembly 10 is switched from the working state to the non-working state, as shown in FIGS. 2 and 4, if the lens assembly 10 before the switching is in the first state (such as the short-focus end) in FIG. 2, when the lens assembly 10 is switched from the first state to the non-working state shown in FIG. 4, the first lens unit 101 and the second lens unit 102 can be moved towards the photosensitive surface 21, and the third lens unit 103 can remain stationary.

[0172] When the lens assembly 10 is switched from the working state to the non-working state, the first lens unit 101, the second lens unit 102 and the third lens unit 103 can move towards the photosensitive surface 21 respectively, that is, when the lens assembly 10 is switched from any state (such as the first state or the second state) in the working state to the non-working state, the three lens units move towards the photosensitive surface 21, compressing the spacing between the third lens unit 103 and the photosensitive surface 21, between the second lens unit 102 and the third lens unit 103, and between the first lens unit 101 and the second lens unit 102, which can further compress the spacing between the first lens unit 101 and the image plane, so that the thickness of the lens assembly 10 in the non-working state can be minimized, significantly reducing the thickness of the camera module 110 in the non-working state, and achieving the thinning of the lens assembly 10 and the camera module 110 in the non-working state.

[0173] Correspondingly, when the lens assembly 10 is switched from the non-working state to the working state, that is, when the lens assembly 10 is switched from the non-working state to any state in the working state, the first lens unit 101, the second lens unit 102 and the third lens unit 103 can move away from the photosensitive surface 21 respectively.

[0174] For example, the camera module 110 is a rear camera lens of an electronic device, and the first lens unit 101, the second lens unit 102 and the third lens unit 103 move respectively when the lens assembly 10 is switched between the working state and the non-working state. The assembly relationship between the lens assembly 10 in the working state and the non-working state and the shell of the electronic device is described.

[0175] When the lens assembly 10 is in the working state, the image sensor 20 is located in the accommodating cavity in the shell, and at least part of the lens assembly 10 can protrude out of the accommodating cavity of the shell through the through hole in the shell (such as the rear cover). For example, the first lens unit 101 closest to the object side can protrude out of the accommodating cavity of the shell through the through hole in the rear cover.

[0176] Of course, in some other examples, the lens assembly 10 can also be made to protrude out of the accommodating cavity of the shell through the through hole, or part of the lens or lens unit close to the object side can protrude out of the accommodating cavity of the shell.

[0177] When the lens assembly 10 is switched from the working state to the non-working state, the first lens unit 101, the second lens unit 102 and the third lens unit 103 move along the optical axis towards the light receiving surface 21 (i.e. the image side) of the image sensor 20, reducing the spacing between the lens units and between the lens units and the light receiving surface 21, so that the part of the lens assembly 10 that protrudes outside the accommodating cavity of the shell can move inwards to the accommodating cavity of the shell, the thickness of the part of the lens assembly 10 that protrudes outside the shell through the through hole is reduced, and the overall space occupied by the camera module 110 in the non-working state is reduced, so that when the lens assembly 10 is in the non-working state, even if the entire camera module 110 is placed in the accommodating cavity of the shell, it will not greatly restrict the thickness design of the electronic device, facilitating the thinning of the electronic device and improving the aesthetics of the electronic device.

[0178] It should be noted that when the lens assembly 10 is in the non-working state, the entire lens assembly 10 can be located in the accommodating cavity of the shell, i.e. the entire camera module 110 is located inside the shell of the electronic device. Alternatively, part of the lens assembly 10 can be located in the accommodating cavity of the shell and part of the lens assembly 10 can protrude outside the accommodating cavity of the shell through the through hole. It can be understood that when the lens assembly 10 is in the non-working state, the thickness of the part of the lens assembly 10 that protrudes outside the accommodating cavity of the shell through the through hole of the rear cover is less than the thickness of the part of the lens assembly 10 that protrudes outside the accommodating cavity of the shell through the through hole of the rear cover when the lens assembly 10 is in the working state.

[0179] Conversely, when the lens assembly 10 is switched from the non-working state to the working state, at least part of the lens assembly 10 can protrude outside the accommodating cavity through the through hole of the rear cover, so that when the lens assembly 10 is in the working state, at least part of the lens assembly 10 is located outside the accommodating cavity of the shell through the through hole.

[0180] In some examples, in order to ensure the sealing of the accommodating cavity inside the electronic device 100, a cover plate can be provided on the through hole of the rear cover, and the cover plate can also be movably arranged to meet the movement requirements of the lens assembly 10. For example, the cover plate can also move along the optical axis.

[0181] When the lens assembly 10 is switched from the non-working state to the working state, the cover plate can first move away from the shell along the optical axis, i.e. protrude out of the through hole in the thickness direction, to form a clearance space, so that the lens assembly 10 can move in the clearance space, such as at least part of the lens assembly 10 also protruding out of the through hole in the thickness direction to the outside of the accommodating cavity of the shell, ensuring the total optical length required for imaging of the lens assembly 10 and ensuring high imaging quality.

[0182] Conversely, when the lens assembly 10 is switched from the working state to the non-working state, the lens units in the lens assembly 10 can move along the optical axis towards the light-sensitive surface 21 of the image sensor 20 in the accommodating cavity, so that at least part of the lens assembly 10 is retracted into the shell, and the cover plate can also move along the optical axis towards the shell and be retracted, so that the cover plate sealing cover is arranged on the through hole.

[0183] It can be understood that, in the process of movement of the first lens unit 101, the diaphragm also moves with the movement of the first lens unit 101. As shown in FIG. 4, the diaphragm 104 can be fixed with the first lens 11 closest to the object side in the first lens unit 101 to drive the diaphragm 104 to move together.

[0184] For example, the diaphragm 104 can be a variable diaphragm with a variable aperture size. When the lens assembly 10 is in the first state, the maximum aperture of the variable diaphragm is D1, and when the lens assembly 10 is in the second state, the maximum aperture of the variable diaphragm is D2. The maximum aperture D1 of the variable diaphragm when the lens assembly 10 is in the first state can be less than or equal to the maximum aperture D2 of the variable diaphragm when the lens assembly 10 is in the second state, i.e., D1≤D2, which increases the aperture of the lens assembly 10 in the second state (telephoto state), improves the amount of light entering the lens assembly 10 in the second state, and ensures high imaging quality of the lens assembly 10 in the second state.

[0185] The camera module 110 can further include a driving structure, which can be a driving chip, a driving motor, etc. The number of driving structures can be multiple. The driving structures are respectively connected with the first lens unit 101, the second lens unit 102 and the third lens unit 103, and respectively drive the first lens unit 101, the second lens unit 102 and the third lens unit 103 to move.

[0186] In some examples, the first lens unit 101, the second lens unit 102 and the third lens unit 103 can be movably arranged on the lens barrel in a sliding rail manner, etc. The driving structure can drive the first lens unit 101, the second lens unit 102 and the third lens unit 103 to move along the optical axis relative to the lens barrel, so as to realize the movable arrangement of the first lens unit 101, the second lens unit 102 and the third lens unit 103.

[0187] In the lens assembly 10 of the above architecture, exemplarily, when the lens assembly 10 is in the working state, the lens assembly 10 can satisfy the condition formula 1.0≤TTL / EFL≤2.7, where EFL is the effective focal length of the lens assembly 10, and TTL is the total optical length of the lens assembly 10. Making the lens assembly 10 have a smaller total optical length, realizing the conditions of optical continuous zoom and high-quality imaging in continuous zoom, is conducive to realizing the miniaturization of the lens assembly 10, and further meeting the thinning design requirements of portable mobile electronic devices such as mobile phones.

[0188] When the lens assembly 10 is in the working state and at the short-focus end, the lens assembly 10 can also satisfy the condition formula 1.0≤TTL min / EFL min ≤1.7, where EFL min is the effective focal length of the lens assembly 10 at the short-focus end, and TTL min is the total optical length of the lens assembly 10 at the short-focus end. Guaranteeing that the lens assembly 10 has a smaller total optical length at the short-focus end guarantees that the lens assembly 10 can be miniaturized and better meets the thinning design requirements of electronic devices.

[0189] Exemplarily, when the lens assembly 10 is in the working state, the lens assembly 10 can also satisfy the condition formula 0.8≤IH / EFL≤1.2, where IH is the image height of the lens assembly 10. The lens assembly 10 has a larger image height, which guarantees that the lens assembly 10 has high imaging quality and meets the high imaging quality requirements of electronic devices.

[0190] The lens assembly 10 can also satisfy the condition formula f1>EFL max , where f1 is the effective focal length of the first lens unit 101, and EFL max is the effective focal length of the lens assembly 10 at the long-focus end. This guarantees that the effective focal length of the first lens unit 101 is greater than the effective focal length of the lens assembly 10 in the working state, makes the focal length of the first lens unit 101 longer, reduces the refractive power of the first lens unit 101, is conducive to reducing the aberration generated by the moving first lens unit, and further improves the imaging quality.

[0191] In the embodiments of the present application, the shapes, thicknesses, materials, etc. of the lenses in the first lens unit 101, the second lens unit 102, and the third lens unit 103 are not limited. For example, the shape of the lens can be circular, track circular, elliptical, or other regular or irregular images. The material of the lens can be plastic, glass, etc., and the shapes, materials, etc. of multiple lenses can be the same or different. The specific lens shape, thickness, material, etc. can be selected and set according to design requirements.

[0192] As in some examples, in the third lens unit 103, the image side surface of the lens nearest to the image side can include at least two inflection points, as shown in FIG. 4, taking the third lens unit 103 including the ninth lens 19 and the tenth lens 111 as an example, the tenth lens 111 being the lens nearest to the image side in the third lens unit 103, the image side surface of the tenth lens 111 can include at least two inflection points, so that the image side surface of the tenth lens 111 is a M-like surface as shown in FIG. 4.

[0193] The lens nearest to the image side in the third lens unit 103 can be the lens nearest to the image side in the lens assembly, so that the lens at the end of the lens assembly 10 nearest to the image side has at least two inflection points, which is beneficial to better correcting the optical aberration of the edge field of view and improving the imaging quality.

[0194] As in some examples, the molding material of the lenses in the second lens unit 102 can be plastic material, and the molding material of the lenses in the third lens unit 103 can also be plastic material, that is, the lenses included in the second lens unit 102 and the third lens unit 103 can all be plastic lenses, which is beneficial to reducing the cost of the lens assembly 10 under the condition of ensuring the precision of the lens assembly 10.

[0195] Each lens in the first lens unit 101, the second lens unit 102, and the third lens unit 103 can be an aspherical lens, for example, each lens can be an aspherical lens respectively. The aspherical lens can reduce or eliminate the spherical aberration and distortion aberration introduced by the spherical lens, thereby improving the imaging quality.

[0196] The structure and performance of the lens assembly 10 and the camera module 110 provided in the present application will be described below in combination with specific embodiments.

[0197] Embodiment One

[0198] FIG. 5 is a structural schematic diagram of a lens assembly in a camera module in a working state and in a first state according to Embodiment One of the present application.

[0199] In the present embodiment, referring to FIG. 5, the lens assembly 10 of the camera module 110 includes a first lens unit 101a, a second lens unit 102a, and a third lens unit 103a. The first lens unit 101a includes three lenses with optical power, such as a first lens 11a, a second lens 12a, and a third lens 13a. The second lens unit 102a includes two lenses with optical power, such as a fourth lens 14a and a fifth lens 15a. The third lens unit 103a includes two lenses with optical power, such as a sixth lens 16a and a seventh lens 17a.

[0200] That is, in the camera module 110, along the direction of the optical axis L, from the object side to the image side, the variable aperture 104, the first lens 11a, the second lens 12a, the third lens 13a, the fourth lens 14a, the fifth lens 15a, the sixth lens 16a, the seventh lens 17a, the filter 30 and the image sensor 20 are arranged in sequence. The light entering the camera module 110 passes through the lens assembly 10, the filter 30 in the above order and irradiates onto the photosensitive surface 21 of the image sensor 20, and finally forms an image on the photosensitive surface 21.

[0201] The first lens unit 101a has positive focal power, the second lens unit 102a has positive focal power, and the third lens unit 103a has negative focal power.

[0202] Referring to FIG. 5, when the lens assembly 10 is in the working state and the lens assembly 10 is in the first state, such as when the lens assembly 10 is at the short-focus end, there is a gap between the first lens unit 101a and the second lens unit 102a, between the second lens unit 102a and the third lens unit 103a, and between the first lens unit 101a and the photosensitive surface 21, such as the first lens unit 101a being closer to the second lens unit 102a, and the third lens unit 103a being closer to the photosensitive surface 21.

[0203] FIG. 6 is a structural schematic diagram of the lens assembly of the camera module in FIG. 5 in the working state and in the second state.

[0204] Referring to FIG. 6, when the lens assembly 10 is continuously zoomed from the first state to the second state, the third lens unit 103a moves along the optical axis L towards the second lens unit 102a, reducing the gap between the third lens unit 103a with negative focal power and the second lens unit 102a with positive focal power, realizing continuous zooming from the first state to the second state. And in the process of continuous zooming, the second lens unit 102a remains stationary, the first lens unit 101a moves along the optical axis L away from the second lens unit 102a, increasing the gap between the first lens unit 101a and the photosensitive surface 21, realizing focusing in the process of continuous zooming, and ensuring high imaging quality when the lens assembly 10 is at any focal length within the first state to the second state. Referring to FIG. 6, when the lens assembly 10 is in the second state, such as when the lens assembly 10 is at the long-focus end, compared with the lens assembly 10 in the first state shown in FIG. 5, the first lens unit 101a is farther away from the second lens unit 102a, and the third lens unit 103a is closer to the second lens unit 102a.

[0205] For example, when the lens assembly 10 is at the short focal length end (e.g., the effective focal length is 8.8 mm), as shown in FIG. 5, the distance between the first lens unit 101a and the second lens unit 102a is the distance on the optical axis of the air gap between the image side surface of the third lens 13a and the object side surface of the fourth lens 14a, which is 0.08 mm (see Table 1.1, row S6, a1). The distance between the third lens unit 103a and the second lens unit 102a is the distance on the optical axis of the air gap between the image side surface of the fifth lens 15a and the object side surface of the sixth lens 16a, which can be 1.30 mm (see Table 1.1, row S10, a1). As shown in FIG. 6, when the lens assembly 10 is at the long focal length end (e.g., the effective focal length is 12.8 mm), compared with the lens assembly 10 at the short focal length end, the first lens unit 101a is farther away from the second lens unit 102a, and the distance on the optical axis of the air gap between the image side surface of the third lens 13a and the object side surface of the fourth lens 14a can be 1.96 mm (see Table 1.1, row S6, a2). The third lens unit 103a is closer to the second lens unit 102a, and the distance on the optical axis of the air gap between the image side surface of the fifth lens 15a and the object side surface of the sixth lens 16a can be 0.05 mm (see Table 1.1, row S10, a2).

[0206] When the lens assembly 10 is switched from the working state to the non-working state, the first lens unit 101a, the second lens unit 102a, and the third lens unit 103a are moved along the optical axis L toward the photosensitive surface 21, respectively, to reduce the distances between the lens units and between the lens units and the photosensitive surface 21, thereby achieving the miniaturization of the lens assembly 10 in the non-working state and meeting the thin design requirements of electronic devices.

[0207] The maximum aperture D1 of the variable aperture 104 when the lens assembly 10 is in the first state and the maximum aperture D2 of the variable aperture 104 when the lens assembly 10 is in the second state satisfy D1 = D2.

[0208] The zoom ratio n of the lens assembly 10 is n ≈ 1.45.

[0209] The effective focal length f1 of the first lens unit 101a is f1 = 13.5 mm, and the effective focal length EFL of the lens assembly 10 at the long focal length end is EFL = 8 mm. max

[0210] The ratio of the total optical length TTL of the lens assembly 10 at the short focal length end to the effective focal length EFL of the lens assembly 10 at the short focal length end is TTL / EFL = 1.27. min min min min

[0211] ​​​​​Image height IH of the lens assembly 10 at the short focal length end min The ratio of the image height IH of the lens assembly 10 at the short focal length end to the effective focal length EFL of the lens assembly 10 at the short focal length end is IH / EFL = 0.909. min min min

[0212] The field of view of the lens assembly 10 at the short focal length end is 84°, and the field of view of the lens assembly 10 at the long focal length end is 57°.

[0213] Table 1.1 shows the optical parameters of each lens in a camera module provided by Embodiment One of the present application.

[0214] Wherein, G1 is the first lens unit 101a, L1 is the first lens 11a, L2 is the second lens 12a, and L3 is the third lens 13a. G2 is the second lens unit 102a, L4 is the fourth lens 14a, and L5 is the fifth lens 15a. G3 is the third lens unit 103a, L6 is the sixth lens 16a, and L7 is the seventh lens 17a.

[0215] S1 and S2 are the object side and image side of the first lens 11a respectively, S3 and S4 are the object side and image side of the second lens 12a respectively, S5 and S6 are the object side and image side of the third lens 13a respectively, S7 and S8 are the object side and image side of the fourth lens 14a respectively, S9 and S10 are the object side and image side of the fifth lens 15a respectively, S11 and S12 are the object side and image side of the sixth lens 16a respectively, and S13 and S14 are the object side and image side of the seventh lens 17a respectively.

[0216] The thickness is the distance between the adjacent surfaces on the optical axis in the direction from the object side to the image side. Wherein, d is the thickness of the lens, that is, the distance between the object side and the image side of the lens on the optical axis. a is the air gap between the lenses, that is, the distance between the image side of one lens and the object side of the adjacent lens on the optical axis in the direction from the object side to the image side.

[0217] For example, taking the first lens 11a as an example, in the thickness column corresponding to the L1 row of the first lens 11a, d is the distance between the object side and the image side of the first lens 11a on the optical axis, which can be understood as the central thickness of the first lens 11a, and a is the distance between the image side of the first lens 11a and the object side of the second lens 12a adjacent to the first lens 11a on the optical axis, which can be understood as the air gap between the first lens 11a and the second lens 12a.

[0218] ​​​It should be noted that when the lens assembly 10 is continuously zoomed from the first state to the second state and focusing is achieved during zooming, the first lens unit 101a and the third lens unit 103a move along the optical axis, and the air gap between the third lens 13a of the first lens unit 101a and the fourth lens 14a of the second lens unit 102a changes when the lens assembly 10 is in the first state and the second state, the air gap between the fifth lens 15a of the second lens unit 102a and the sixth lens 16a of the third lens unit 103a also changes, and the air gap between the seventh lens 17a of the third lens unit 103a and the light receiving surface 21 of the image sensor 20 also changes.

[0219] As shown in Table 1, a1 is the air gap between the lens and the adjacent lens when the lens assembly 10 is in the first state, and a2 is the air gap between the lens and the adjacent lens when the lens assembly 10 is in the second state. For example, taking the movement of the first lens unit 101a as an example, in the thickness column corresponding to the L3 row of the third lens 13a, a1 is the air gap (distance along the optical axis) between the image side of the third lens 13a and the object side of the fourth lens 14a when the lens assembly 10 is in the first state, and a2 is the air gap between the image side of the third lens 13a and the object side of the fourth lens 14a when the lens assembly 10 is in the second state.

[0220] The radius of curvature R refers to the central radius of curvature of the lens, the refractive index nd refers to the refractive index of d light under the lens, for example, the d light can be light of 587.56 nm. The Abbe number vd refers to the Abbe number of the lens.

[0221] Table 1.2 shows the asphericity coefficients of each lens in a lens assembly provided by Embodiment One of the present application.

[0222] Each lens in the lens assembly 10 is an aspheric lens, which can be an aspheric lens, and the lens assembly 10 includes 14 aspheric surfaces. The lens assembly 10 satisfies the following conditional expression:

[0223] Wherein, the parameter c = 1 / R, R is the radius of curvature, r is the distance from a point on the optical surface to the optical axis, z represents the sag of the point along the optical axis, k is the quadratic surface coefficient of the lens, a4, a6, a8, a10, a12, a14, a16, a18, a20 are asphericity coefficients, which can be referred to Table 1.2 above.

[0224] The optical parameters of the camera module 110 composed of the above lenses can be referred to Table 1.3 below.

[0225] Table 1.3 shows the optical parameters of a camera module provided by Embodiment One of the present application.

[0226] From the above Table 1.3, it can be seen that the lens assembly 10 provided by the embodiment one of the present application can realize optical continuous zooming in a long focal length range in the working state, and has high imaging quality. The lens assembly 10 has a small total optical length in the non-working state, and can realize miniaturization of the lens assembly 10 and the camera module 110.

[0227] FIG. 7 is a modulation transfer function curve diagram of the lens assembly in the first state in FIG. 5, and FIG. 8 is a modulation transfer function curve diagram of the lens assembly in the second state in FIG. 6.

[0228] In FIGS. 7 and 8, the abscissa represents different frequencies, and the ordinate represents modulation contrast, which can reflect the imaging resolution of different spatial frequencies. The solid line in the figure represents the sagittal field of view, the dotted line in the figure represents the meridional field of view, and the diff. limit line in the figure represents the limit curve of high-quality imaging. As can be seen from FIGS. 7 and 8, the aberration of the lens assembly is well corrected, and the lens assembly can realize high-quality imaging in the first state (short focal length end) and the second state (long focal length end).

[0229] Embodiment two

[0230] FIG. 9 is a structural schematic diagram of a lens assembly in a camera module in the working state and in the first state according to the embodiment two of the present application.

[0231] In the embodiment of the present application, referring to FIG. 9, the lens assembly 10 of the camera module 110 includes a first lens unit 101b, a second lens unit 102b and a third lens unit 103b. The first lens unit 101b includes three lenses with optical power, such as a first lens 11b, a second lens 12b and a third lens 13b. The second lens unit 102b includes three lenses with optical power, such as a fourth lens 14b, a fifth lens 15b and a sixth lens 16b. The third lens unit 103b includes two lenses with optical power, such as a seventh lens 17b and an eighth lens 18b.

[0232] That is to say, in the camera module 110, along the direction of the optical axis L, from the object side to the image side, there are arranged in order a variable aperture 104, the first lens 11b, the second lens 12b, the third lens 13b, the fourth lens 14b, the fifth lens 15b, the sixth lens 16b, the seventh lens 17b, the eighth lens 18b, the optical filter 30 and the image sensor 20. The light entering the camera module 110 passes through the lens assembly 10, the optical filter 30 and irradiates onto the photosensitive surface 21 of the image sensor 20 in the above order, and finally forms an image on the photosensitive surface 21.

[0233] The first lens unit 101b has positive optical power, the second lens unit 102b has positive optical power, and the third lens unit 103b has negative optical power.

[0234] 9 , when the lens assembly 10 is in operation and in the first state, such as at the short focal length, the first lens unit 101 b is closer to the second lens unit 102 , and the third lens unit 103 b is closer to the photosensitive surface 21 .

[0235] FIG10 is a schematic structural diagram of the lens assembly of the camera module in FIG9 in the working state and in the second state.

[0236] As shown in FIG10 , when the lens assembly 10 continuously zooms from the first state to the second state, the third lens unit 103b moves along the optical axis L toward the second lens unit 102b, achieving continuous zooming from the first state to the second state. Furthermore, during the continuous zooming process, the second lens unit 102b remains stationary, while the first lens unit 101b moves away from the second lens unit 102b along the optical axis L, achieving focus during the continuous zooming process and ensuring high imaging quality of the lens assembly 10. Referring to FIG10 , when the lens assembly 10 is in the second state, such as when the lens assembly 10 is at the telephoto end, compared to the lens assembly 10 in the first state shown in FIG9 , the first lens unit 101b is further away from the second lens unit 102b, and the third lens unit 103b is closer to the second lens unit 102b.

[0237] When the lens assembly 10 switches from the working state to the non-working state, the first lens unit 101b, the second lens unit 102b and the third lens unit 103b respectively move along the optical axis L toward the photosensitive surface 21, thereby miniaturizing the lens assembly 10 in the non-working state.

[0238] When the lens assembly 10 is in the first state, the maximum aperture D1 of the variable aperture 104 and when the lens assembly 10 is in the second state, the maximum aperture D2 of the variable aperture 104 satisfy D1<D2.

[0239] The zoom ratio n of the lens assembly 10 is ≈1.64.

[0240] The effective focal length f1 of the first lens unit 101b is 17.0 mm, and the effective focal length EFL of the lens assembly 10 at the telephoto end is max =12.3mm.

[0241] Total optical length TTL of the lens assembly 10 at the short focal length end min The effective focal length EFL of the lens assembly 10 at the short focal end min The ratio is TTL min / EFLmin =1.52.

[0242] Image height IH of lens assembly 10 at short focal length min The effective focal length EFL of the lens assembly 10 at the short focal end min The ratio is IH min / EFL min =1.067.

[0243] The field of view angle of the lens assembly 10 when it is at the short focal end is 90°, and the field of view angle of the lens assembly 10 when it is at the long focal end is 63°.

[0244] Table 2.1 shows the optical parameters of each lens in a camera module provided in Example 2 of the present application.

[0245] Here, G1 is the first lens unit 101b, L1 is the first lens 11b, L2 is the second lens 12b, and L3 is the third lens 13b. G2 is the second lens unit 102b, L4 is the fourth lens 14b, L5 is the fifth lens 15b, and L6 is the sixth lens 16b. G3 is the third lens unit 103b, L7 is the seventh lens 17b, and L8 is the eighth lens 18b.

[0246] The detailed illustration of S1-S14 can be found in the first embodiment. S15 and S16 are respectively the object side and the image side of the eighth lens 18b.

[0247] The thickness, curvature radius R, refractive index nd, and Abbe number vd can also be seen in the first embodiment, and will not be described in detail in this embodiment.

[0248] Table 2.2 shows the aspheric coefficients of each lens in a lens assembly provided in Example 2 of the present application.

[0249] Each lens in the lens assembly 10 is an aspherical lens, for example, each lens can be an aspherical lens. The lens assembly 10 includes 16 aspherical surfaces. The lens assembly 10 satisfies the following conditional formula:

[0250] Among them, the parameter c = 1 / R, R is the radius of curvature, r is the distance from a point on the optical surface to the optical axis, z represents the sagittal height of the point along the optical axis, k is the quadratic surface coefficient of the mirror, a4, a6, a8, a10, a12, a14, a16, a18, and a20 are aspheric coefficients, which can be seen in Table 2.2 above.

[0251] The optical parameters of the camera module 110 composed of the above-mentioned lenses can be seen in Table 2.3 below.

[0252] Table 2.3 shows optical parameters of a camera module provided in Embodiment Two.

[0253] From the above Table 2.3, it can be seen that the lens assembly 10 provided in Embodiment Two can realize optical continuous zooming in a long focal length range in the working state, has high imaging quality, and the second lens unit 102b includes three lenses, which improves the design freedom, increases the aperture and zoom ratio of the lens assembly 10, and is beneficial to improving the imaging quality of the lens assembly 10. The lens assembly 10 has a small total optical length in the non-working state, and can realize miniaturization of the lens assembly 10 and the camera module 110.

[0254] FIG. 11 is a modulation transfer function curve diagram of the lens assembly in FIG. 9 in the first state, and FIG. 12 is a modulation transfer function curve diagram of the lens assembly in FIG. 10 in the second state.

[0255] The horizontal and vertical coordinates of FIGS. 11 and 12 are the same as those of Embodiment One, and will not be described again in this embodiment. As can be seen from FIGS. 11 and 12, the aberration of the lens assembly is well corrected, and the lens assembly can realize high-quality imaging in the first state and the second state.

[0256] Embodiment Three

[0257] FIG. 13 is a structural schematic diagram of a lens assembly in a camera module provided in Embodiment Three in the working state and in the first state.

[0258] In the present embodiment, referring to FIG. 13, the lens assembly 10 of the camera module 110 includes a first lens unit 101c, a second lens unit 102c and a third lens unit 103c. The first lens unit 101c includes four lenses with optical power, such as a first lens 11c, a second lens 12c, a third lens 13c and a fourth lens 14c. The second lens unit 102c includes four lenses with optical power, such as a fifth lens 15c, a sixth lens 16c, a seventh lens 17c and an eighth lens 18c. The third lens unit 103c includes two lenses with optical power, such as a ninth lens 19c and a tenth lens 111c.

[0259] That is, in the camera module 110, from the object side to the image side along the optical axis L, the variable aperture 104, the first lens 11c, the second lens 12c, the third lens 13c, the fourth lens 14c, the fifth lens 15c, the sixth lens 16c, the seventh lens 17c, the eighth lens 18c, the ninth lens 19c, the tenth lens 111c, the filter 30 and the image sensor 20 are arranged in sequence. The light entering the camera module 110 passes through the lens assembly 10, the filter 30 in the above order and irradiates onto the photosensitive surface 21 of the image sensor 20, and finally forms an image on the photosensitive surface 21.

[0260] The first lens unit 101c has positive refractive power, the second lens unit 102c has positive refractive power, and the third lens unit 103c has negative refractive power.

[0261] Referring to FIG. 13, when the lens assembly 10 is in the working state and the lens assembly 10 is in the first state, such as when the lens assembly 10 is at the short-focus end, compared with the lens assembly 10 in the first state shown in FIG. 12, the first lens unit 101c is closer to the second lens unit 102c, and the third lens unit 103c is closer to the photosensitive surface 21.

[0262] FIG. 14 is a structural schematic diagram of the lens assembly of the camera module in FIG. 13 in the working state and in the second state.

[0263] Referring to FIG. 14, when the lens assembly 10 is continuously zoomed from the first state to the second state, the second lens unit 102c moves along the optical axis L towards the object side (away from the photosensitive surface 21), and the third lens unit 103c moves along the optical axis L towards the second lens unit 102c, realizing continuous zooming from the first state to the second state. And in the process of continuous zooming, the first lens unit 101c moves along the optical axis L away from the second lens unit 102c, realizing focusing in the process of continuous zooming, and ensuring high imaging quality of the lens assembly 10. Referring to FIG. 14, when the lens assembly 10 is at the long-focus end, the first lens unit 101c is farther away from the second lens unit 102c, the second lens unit 102c is farther away from the photosensitive surface 21, and the third lens unit 103c is closer to the second lens unit 102c.

[0264] When the lens assembly 10 is switched from the working state to the non-working state, the first lens unit 101c, the second lens unit 102c and the third lens unit 103c move along the optical axis L towards the photosensitive surface 21 respectively, realizing miniaturization of the lens assembly 10 in the non-working state.

[0265] The maximum aperture D1 of the variable aperture 104 when the lens assembly 10 is in the first state and the maximum aperture D2 of the variable aperture 104 when the lens assembly 10 is in the second state satisfy D1 < D2.

[0266] The zoom ratio n of the lens assembly 10 is ≈1.43.

[0267] The effective focal length f1 of the first lens unit 101c is 15.9 mm, and the effective focal length EFL of the lens assembly 10 at the telephoto end is max =12.9mm.

[0268] Total optical length TTL of the lens assembly 10 at the short focal length end min The effective focal length EFL of the lens assembly 10 at the short focal end min The ratio is TTL min / EFL min =1.38.

[0269] Image height IH of lens assembly 10 at short focal length min The effective focal length EFL of the lens assembly 10 at the short focal end min The ratio is IH min / EFL min =0.917.

[0270] The field of view angle of the lens assembly 10 when it is at the short focal end is 82°, and the field of view angle of the lens assembly 10 when it is at the long focal end is 63°.

[0271] Table 3.1 shows the optical parameters of each lens in a camera module provided in Example 3 of the present application.

[0272] Here, G1 is the first lens unit 101c, L1 is the first lens 11c, L2 is the second lens 12c, L3 is the third lens 13c, and L4 is the fourth lens 14c. G2 is the second lens unit 102c, L5 is the fifth lens 15c, L6 is the sixth lens 16c, L7 is the seventh lens 17c, and L8 is the eighth lens 18c. G3 is the third lens unit 103c, L9 is the ninth lens 19c, and L10 is the tenth lens 111c.

[0273] For the specific illustration of S1-S14, please refer to Example 1. S15 and S16 are respectively the object side and image side of the eighth lens 18c, S17 and S18 are respectively the object side and image side of the ninth lens 19c, and S19 and S20 are respectively the object side and image side of the tenth lens 111c.

[0274] The thickness, curvature radius R, refractive index nd, and Abbe number vd can also be seen in the first embodiment, and will not be described in detail in this embodiment.

[0275] Table 3.2 shows the aspheric coefficients of each lens in a lens assembly provided in Example 3 of the present application.

[0276] Each lens in the lens assembly 10 is an aspherical lens, which can be an aspherical lens. The lens assembly 10 includes 20 aspherical lenses. The lens assembly 10 satisfies the following conditional expression:

[0277] In the conditional expression, c=1 / R, R is the radius of curvature, r is the distance from a point on the optical surface to the optical axis, z represents the sag of the point along the optical axis, k is the quadratic surface coefficient of the lens, and a4, a6, a8, a10, a12, a14, a16, a18, and a20 are aspherical coefficients. Refer to Table 3.2 above.

[0278] The optical parameters of the camera module 110 composed of the lenses described above can be seen from Table 3.3 below.

[0279] Table 3.3 shows the optical parameters of the camera module provided in Embodiment Three.

[0280] As can be seen from Table 3.3, the lens assembly 10 provided in Embodiment Three can achieve optical continuous zooming in a long focal length range in the working state, has high imaging quality, and has a small total optical length in the non-working state, thereby achieving miniaturization of the lens assembly 10 and the camera module 110.

[0281] FIG. 15 is a modulation transfer function curve diagram of the lens assembly in the first state in FIG. 13, and FIG. 16 is a modulation transfer function curve diagram of the lens assembly in the second state in FIG. 14.

[0282] The horizontal and vertical coordinates of FIGS. 15 and 16 are the same as in Embodiment One and will not be described again in this embodiment. As can be seen from FIGS. 15 and 16, the aberration of the lens assembly is well corrected, and the lens assembly can achieve high-quality imaging in the first state and the second state.

[0283] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, and “connecting” should be understood in a broad sense, for example, can be fixed connection, can be indirect connection through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances. The terms “first”, “second”, “third”, “fourth” and the like (if any) are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0284] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the embodiments of the present application are described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lens assembly, characterized by, The lens assembly comprises, in order from the object side to the image side along the optical axis, a first lens unit, a second lens unit and a third lens unit, the first lens unit has positive refractive power, the second lens unit has positive refractive power, and the third lens unit has negative refractive power; The first lens unit and the third lens unit are movably arranged along the optical axis; When the lens assembly is switched from the first state to the second state, the first lens unit moves away from the second lens unit along the optical axis, and the third lens unit moves toward the second lens unit along the optical axis, so that the lens assembly realizes continuous zooming and focusing during the continuous zooming, and the focal length of the lens assembly in the first state is smaller than the focal length of the lens assembly in the second state.

2. The lens assembly of claim 1, wherein, The second lens unit is movably arranged along the optical axis, and when the lens assembly is continuously zoomed from the first state to the second state, the second lens unit moves toward the object side along the optical axis.

3. The lens assembly of claim 2, wherein, The lens assembly can be switched between the first state and the second state when the lens assembly is in the working state; When the lens assembly is switched from the working state to the non-working state, at least the first lens unit moves toward the image side; When the lens assembly is switched from the non-working state to the working state, at least the first lens unit moves away from the image side.

4. The lens assembly of claim 3, wherein, When the lens assembly is switched from the working state to the non-working state, the first lens unit, the second lens unit and the third lens unit respectively move toward the image side; When the lens assembly is switched from the non-working state to the working state, the first lens unit, the second lens unit and the third lens unit respectively move away from the image side.

5. The lens assembly according to any one of claims 1-4, wherein, A variable aperture is further included, and the variable aperture is located on the side of the first lens unit facing the object side; The maximum aperture of the variable aperture when the lens assembly is in the first state is less than or equal to the maximum aperture of the variable aperture when the lens assembly is in the second state.

6. The lens assembly according to any one of claims 1-5, wherein, The zoom ratio n of the lens assembly ranges from 1.3 to 2.

5.

7. The lens assembly according to any one of claims 1-6, wherein, When the lens assembly is in a working state, the lens assembly satisfies a condition formula: f1>EFL max , wherein f1 is an effective focal length of the first lens unit, EFL max is an effective focal length of the lens assembly at a telephoto end.

8. The lens assembly according to any one of claims 1-7, wherein, When the lens assembly is in the working state, the lens assembly satisfies the condition formula: 1.0≤TTL / EFL≤2.7, where EFL is the effective focal length of the lens assembly, and TTL is the total optical length of the lens assembly.

9. The lens assembly according to claim 8, wherein, The lens assembly also satisfies the condition formula: 1.0≤TTL / EFL min / EFL min ≤1.7, wherein EFL min is an effective focal length of the lens assembly at a short focus end, and TTL min is an overall optical length of the lens assembly at the short focus end.

10. The lens assembly according to any one of claims 1-9, wherein, When the lens assembly is in the working state, the lens assembly satisfies the condition formula: 0.8≤IH / EFL≤1.2, where EFL is the effective focal length of the lens assembly, and IH is the image height of the lens assembly.

11. The lens assembly according to any one of claims 1-10, wherein, The third lens unit comprises a plurality of lenses with refractive power, and the image side surface of the lens closest to the image side in the third lens unit comprises at least two inflection points.

12. The lens assembly according to any one of claims 1-11, wherein, The first lens unit comprises at least two lenses with refractive power; The second lens unit comprises at least two lenses with refractive power.

13. The lens assembly according to any one of claims 1-12, wherein, The lenses of the second lens unit and the lenses of the third lens unit are plastic lenses respectively.

14. The lens assembly of any one of claims 1-13, wherein, The field of view angle of the lens assembly ranges from 100° to 50°.

15. A camera module, comprising: At least comprising an image sensor and the lens assembly according to any one of claims 1-14, the image sensor is located on the side of the lens assembly facing the image side.

16. An electronic device, comprising: At least comprising a housing and the camera module according to claim 15, the housing has a receiving cavity therein, and at least the image sensor of the camera module is located in the receiving cavity. A through hole is formed on one side of the housing and communicates with the receiving cavity, and when the lens assembly of the camera module is in a working state, at least part of the lens assembly extends out of the receiving cavity through the through hole. When the lens assembly of the camera module switches from the working state to the non-working state, the first lens unit, the second lens unit and the third lens unit move along the optical axis towards the image sensor.

Images