CN118859462A

CN118859462A - Lens assembly, camera module and electronic equipment

Info

Publication number: CN118859462A
Application number: CN202310480824.2A
Authority: CN
Inventors: 龙思琛; 张凯元
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2024-10-29
Also published as: WO2024222578A1

Abstract

The embodiment of the application provides a lens assembly, a camera module and electronic equipment, wherein the lens assembly at least comprises seven lenses which are sequentially arranged from an object side to an image side, the lens nearest to the image side has negative focal power, and at least two of a plurality of lenses between a first lens nearest to the object side and a lens nearest to the image side have positive focal power. The refractive index of the first lens is larger than 1.70, the lens is made of high refractive index materials, an air gap SP23 between the second lens and the third lens, a center thickness CT2 of the second lens and a center thickness CT3 of the third lens are 1.3-2, SP 23/(CT 2+CT3) are smaller than or equal to 2, the first lens can better correct aberration to meet the design requirement of further increase of aperture, the number, focal power, the materials, the shape, the position and the like of the lenses in the lens assembly are reasonably distributed, the lens assembly is provided with an oversized aperture, and high-quality imaging of the large aperture camera module is realized.

Description

Lens assembly, camera module and electronic equipment

Technical Field

The present application relates to the field of electronic devices, and in particular, to a lens assembly, a camera module, and an electronic device.

Background

In recent years, with the development of camera technology, electronic consumer products, such as mobile phones, tablet computers, notebook computers, wearable devices, etc., on which camera modules are gradually miniaturized and thinned, the effect and the requirement of photographing are also more and more aligned with those of a single lens reflex, and the volume and the functional effect of the camera modules are also gradually one of the important features of terminal electronic devices.

At present, the camera module comprises a lens assembly and an image sensor, and light is projected to the image sensor after passing through the lens assembly to realize photoelectric conversion, so that the camera module is used for imaging. The lens assembly is generally formed by sequentially arranging a plurality of lens sheets along the optical axis direction, and the performance of the lens assembly directly determines the imaging performance of the camera module. With the pursuit of shooting effect, there is an increasing demand for the aperture of the lens assembly, such as shooting scenes in a dark environment, high blurring, short exposure, etc., where the lens assembly needs to have a larger aperture to achieve a higher light input and a shallower depth of field of the imaging system. The first lens adjacent to the object side in the current lens assembly generally uses a low refractive index material, so that chromatic dispersion can be well corrected, and as the aperture is increased, the first lens of the low refractive index material is difficult to correct monochromatic aberration which is increased continuously along with the increase of the aperture, and the further increase of the aperture is restricted from being realized, so that the imaging quality of the camera module is affected.

Disclosure of Invention

The application provides a lens assembly, a camera module and electronic equipment, wherein a first lens in the lens assembly is a lens made of high-refractive-index materials, aberration can be better corrected to meet the design requirement of further increasing aperture, and the design of the oversized aperture of the lens assembly is realized by reasonably distributing the number of lenses, focal power and the like, so that high-quality imaging of the large aperture camera module is ensured.

A first aspect of the present application provides a lens assembly including at least a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having optical power, which are arranged in order from an object side to an image side along an optical axis.

The lens closest to the image side in the lens assembly has negative focal power, at least two lenses in the plurality of lenses between the lens closest to the image side and the first lens have positive focal power, and the number of lenses in the lens assembly and the focal power of each lens are reasonably distributed, so that the large aperture design is conveniently realized.

The refractive index ind1 of the first lens meets the condition that ind1 is larger than 1.70, the first lens is made of high refractive index material, the bending capacity of the first lens to light is improved, monochromatic aberration can be better corrected, the further increased design requirement of an aperture is met, the optical quality of a large aperture lens assembly is improved, and therefore the imaging quality and the imaging effect of a camera module with a large aperture design are improved.

The second lens and the third lens satisfy the conditional expression: 1.3.ltoreq.SP 23/(CT2+CT3). Ltoreq.2, wherein SP23 is the distance between the object side surface of the second lens and the object side surface of the third lens on the optical axis, CT2 is the distance between the object side surface of the second lens and the image side surface of the second lens on the optical axis, and CT3 is the distance between the object side surface of the third lens and the image side surface of the third lens on the optical axis. The smooth transition of light between the second lens and the third lens is facilitated, and the imaging quality is improved. And the sum of the center thicknesses of the second lens and the third lens is smaller than the air gap between the second lens and the third lens, and the second lens and the third lens can be lenses made of materials with high refractive index and low abbe number, so that the focal power of the second lens and the third lens, the shapes and the positions of the second lens and the third lens are reasonably distributed, aberration correction is facilitated, and large aperture design is facilitated. On the other hand, the optical total length of the lens assembly is reduced, the thinning design of the camera module is realized, the second lens and the third lens are guaranteed to have good processability, and the production is convenient to realize.

The lens component meets the condition that f/EPD is less than or equal to 1.3, wherein f is the effective focal length of the lens component, and EPD is the entrance pupil diameter of the lens component. The f# =f/EPD of the lens assembly, the f# is very small, the lens assembly has an oversized aperture, so that the gradually-increased aperture design requirement can be met, the light inlet quantity of the lens assembly is improved, and the camera module has excellent imaging quality and effect.

In summary, the lens assembly can better correct the aberration through making the first lens be the lens of high refractive index material, so as to meet the design requirement of further increase of aperture, ensure that the large aperture camera module has excellent imaging quality and effect, and through reasonable distribution of the quantity of lenses in the lens assembly, the focal power of each lens, the materials, shape and position of the first lens, the second lens and the third lens, the ultra-large aperture design of the lens assembly is realized, that is, the high quality imaging of the camera module with the large aperture design is realized.

In one possible implementation manner, the lens assembly satisfies the condition formula TTL/IMH less than or equal to 2, wherein TTL is the optical total length of the lens assembly, IMH is the half-image height of the lens assembly, and the lens assembly has smaller optical total length under the condition of ensuring excellent imaging quality and effect, so that the length dimension of the lens assembly is reduced, the thinning design of the camera module is convenient to realize, and the ultra-thin camera module with ultra-large aperture and high imaging quality is obtained.

In one possible implementation, the lens assembly includes a number N of lenses having optical power that is 7N 9, each lens having optical power. Under the condition that the number of lenses is reasonably distributed to realize the design of a large aperture, the optical total length of the lens assembly is further reduced, and the thinning design of the camera module is more convenient to realize.

In one possible implementation, the lens closest to the image side in the lens assembly is a terminal lens, and the lens adjacent to the terminal lens and on the side of the terminal lens facing the object side is a secondary terminal lens.

The first lens and the secondary end lens respectively have positive focal power, the second lens and the end lens respectively have negative focal power, the focal power can be further reasonably distributed, and the ultra-large aperture design of the lens assembly can be realized. In addition, the focal power collocation of the first lens and the second lens and the focal power collocation of the end lens and the secondary end lens are also beneficial to correcting aberration, so that the imaging quality and effect are further improved.

In one possible implementation, at least one of the object side and the image side of the end lens includes a inflection point to define the shape of the end lens, which is advantageous for further correcting aberrations of the lens assembly to enhance imaging quality and effect.

At least one of the object side and the image side of the secondary end lens includes an inflection point defining the shape of the secondary end lens, which is also advantageous for further correcting aberrations of the lens assembly to enhance imaging quality and effect.

In one possible implementation, the end lens is a seventh lens, the minor end lens is a sixth lens, and the fifth lens has negative optical power. The lens assembly comprises seven lenses, and the focal power of each lens is further reasonably distributed, so that the aperture is further increased.

In one possible implementation manner, at least a portion of the object side surface of the first lens element corresponding to the optical axis is a convex surface, at least a portion of the image side surface of the second lens element corresponding to the optical axis is a concave surface, at least a portion of the image side surface of the fourth lens element corresponding to the optical axis is a convex surface, at least a portion of the object side surface of the sixth lens element corresponding to the optical axis is a convex surface, at least a portion of the object side surface of the seventh lens element corresponding to the optical axis is a convex surface, and at least a portion of the image side surface of the seventh lens element corresponding to the optical axis is a concave surface. The focal power and the shape of seven lenses are further reasonably distributed, so that aberration correction is facilitated, high-quality imaging of the lens assembly is realized, the total optical length of the lens assembly is reduced, and thinning design of the camera module is facilitated.

In one possible implementation, the first lens satisfies the conditional expression: r11/f1 is more than or equal to 0.6 and less than or equal to 0.85, wherein R11 is the curvature radius of the object side surface of the first lens, and f1 is the focal length of the first lens, so that the focal power and the shape of the first lens are further reasonably distributed, and the imaging quality and the imaging effect are improved.

In one possible implementation, the first lens satisfies the conditional expression: R12/R11 is more than or equal to 4, wherein R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, good processability of the first lens is ensured, and the processing is convenient.

In one possible implementation, the second lens satisfies the conditional expression: SAG22/CT2 is more than or equal to 1.8 and less than or equal to 3, wherein SAG22 is the maximum sagittal height of the image side surface of the second lens, so that the second lens is guaranteed to have good machinability, and meanwhile, the contribution of the second lens to aberration is reasonably controlled, and the resolving power of the lens assembly is improved.

In one possible implementation, the lens assembly further includes an eighth lens, the end lens being an eighth lens, the minor end lens being a seventh lens, the sixth lens having a negative optical power. The lens assembly comprises eight lenses, and the focal power of each lens is further reasonably distributed, so that the aperture is further increased.

In one possible implementation manner, at least a portion of the object side surface of the first lens element corresponding to the optical axis is a convex surface, at least a portion of the image side surface of the second lens element corresponding to the optical axis is a concave surface, at least a portion of the object side surface of the third lens element corresponding to the optical axis is a convex surface, at least a portion of the image side surface of the sixth lens element corresponding to the optical axis is a concave surface, at least a portion of the object side surface of the seventh lens element corresponding to the optical axis is a convex surface, at least a portion of the object side surface of the eighth lens element corresponding to the optical axis is a convex surface, and at least a portion of the image side surface of the eighth lens element corresponding to the optical axis is a concave surface. The optical power and the shape of eight lenses are further reasonably distributed, so that aberration correction is facilitated, high-quality imaging of the lens assembly is realized, the total optical length of the lens assembly is reduced, and thinning design of the camera module is facilitated.

In one possible implementation, the first lens and the second lens satisfy the following conditional expression: CT1/CT2 is less than or equal to 3 and less than or equal to 5, wherein CT1 is the distance between the object side surface of the first lens and the image side surface of the first lens on the optical axis, which is favorable for improving the smoothness of the transition of light rays between the first lens and the second lens and further improving the imaging quality and effect.

In one possible implementation, the second lens satisfies the conditional expression: and f2 is more than or equal to 0.8 and less than or equal to |f2|/(R21+R22) and less than or equal to 3, wherein f2 is the focal length of the second lens, R21 is the curvature radius of the object side surface of the second lens, R22 is the curvature radius of the image side surface of the second lens, the shape of the second lens is further limited, the aim of improving the processability of the second lens is achieved, and the aberration contribution quantity of the second lens can be controlled, so that the imaging quality and the imaging effect are improved.

In one possible implementation, the third lens satisfies the conditional expression: 1.2 is less than or equal to |f3|/(R31+R32) is less than or equal to 3, wherein f3 is the focal length of the third lens, R31 is the radius of curvature of the object side surface of the third lens, R32 is the radius of curvature of the image side surface of the third lens, the shape of the third lens is further limited, the processability of the third lens is improved, meanwhile, the aberration contribution quantity of the third lens is controlled, and the imaging quality and effect are improved.

In one possible implementation, the lens assembly satisfies the conditional expression: 1.ltoreq.f1234/f.ltoreq.2, wherein f1234 is the effective focal length of the lens group consisting of the first lens, the second lens, the third lens and the fourth lens, and f is the effective focal length of the lens assembly. The focal power of the first lens, the second lens, the third lens and the fourth lens is reasonably distributed, and under the condition of realizing the ultra-large aperture design, the aberration is further corrected, so that the imaging quality and the imaging effect are improved.

A second aspect of the present application provides a camera module, including an image sensor and any of the above lens assemblies, where the image sensor is located on a side of the lens assembly facing an image side. Through including the lens subassembly, this lens subassembly can realize super large aperture design to have excellent optical quality, make the camera module can realize large aperture design, and have excellent imaging quality and effect, realize the high-quality formation of image of large aperture camera module. And the lens component also has smaller size, which is beneficial to realizing the thinning design of the camera module.

A third aspect of the present application provides an electronic device, including a housing and the camera module described above, where the camera module is disposed on the housing. Through including the camera module, this camera module has excellent imaging quality and effect, does benefit to the performance that promotes electronic equipment, and this camera module thickness size is less, is convenient for satisfy electronic equipment's frivolous design demand.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

Fig. 2 is a schematic structural diagram of a camera module according to an embodiment of the present application;

Fig. 3 is a schematic diagram of a simulation structure of a camera module according to a first embodiment of the present application;

FIG. 4 is a graph illustrating a modulation transfer function of a camera module according to an embodiment of the present application;

fig. 5 is a schematic diagram of a simulation structure of a camera module according to a second embodiment of the present application;

Fig. 6 is a graph of a modulation transfer function of a camera module according to a second embodiment of the present application;

Fig. 7 is a schematic diagram of a simulation structure of a camera module according to a third embodiment of the present application;

Fig. 8 is a graph of a modulation transfer function of a camera module according to a third embodiment of the present application;

Fig. 9 is a schematic diagram of a simulation structure of a camera module according to a fourth embodiment of the present application;

fig. 10 is a graph of a modulation transfer function of a camera module according to a fourth embodiment of the present application;

fig. 11 is a schematic diagram of a simulation structure of a camera module according to a fifth embodiment of the present application;

fig. 12 is a graph of a modulation transfer function of a camera module according to a fifth embodiment of the present application;

fig. 13 is a schematic diagram of a simulation structure of a camera module according to a sixth embodiment of the present application;

fig. 14 is a graph of a modulation transfer function of a camera module according to a sixth embodiment of the present application;

fig. 15 is a schematic diagram of a simulation structure of a camera module according to a seventh embodiment of the present application;

Fig. 16 is a graph of a modulation transfer function of a camera module according to a seventh embodiment of the present application;

fig. 17 is a schematic diagram of a simulation structure of a camera module according to an eighth embodiment of the present application;

FIG. 18 is a graph showing a modulation transfer function of a camera module according to an eighth embodiment of the present application;

fig. 19 is a schematic diagram of a simulation structure of a camera module according to a ninth embodiment of the present application;

Fig. 20 is a graph of a modulation transfer function of a camera module according to a ninth embodiment of the present application;

fig. 21 is a schematic diagram of a simulation structure of a camera module according to a tenth embodiment of the present application;

Fig. 22 is a graph of a modulation transfer function of a camera module according to a tenth embodiment of the present application;

Fig. 23 is a schematic diagram of a simulation structure of a camera module according to an eleventh embodiment of the present application;

Fig. 24 is a graph of a modulation transfer function of a camera module according to an eleventh embodiment of the present application;

fig. 25 is a schematic diagram of a simulation structure of a camera module according to a twelfth embodiment of the present application;

fig. 26 is a graph of a modulation transfer function of a camera module according to a twelfth embodiment of the present application.

Reference numerals illustrate:

100-an electronic device;

101-a camera module;

10-a lens assembly; 11-a first lens; 12-a second lens; 13-a third lens; 14-fourth lens; 15-a fifth lens; 16-a sixth lens; 17-seventh lens; 18-eighth lens; 19-diaphragm;

20-an image sensor; 30-an optical filter;

102-a housing.

Detailed Description

The terminology used in the description of the embodiments of the application herein is for the purpose of describing particular embodiments of the application only and is not intended to be limiting of the application.

For ease of understanding, related art terms related to the embodiments of the present application are explained and explained first.

The object side is defined by the lens component, the side where the object is located is the object side, and the surface of the lens, the optical element or other components facing the object side is the object side.

The image side is the side on which the image of the subject is located, and the surface of the lens, optical element, or the like facing the image side is the image side.

The optical axis refers to a light ray passing through the center of each lens of the lens assembly (refer to the axis L in fig. 2).

The imaging surface is positioned at the image side of all lenses in the lens assembly, and light rays sequentially pass through the carrier surfaces of all lenses in the lens assembly to form an image.

Half image height (IMAGE HEIGTH; IMH), which is half the total image height of the image formed by the lens assembly, is the maximum radius of the imaging circle.

The entrance pupil, the conjugate image of the aperture stop in object space is called the "entrance pupil", and the position and diameter of the entrance pupil represent the position and aperture of the incident beam.

Optical power, which characterizes the refractive power of the lens to an incident parallel beam.

Positive focal power indicates that the lens has a positive focal length and has the effect of converging light.

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

Abbe number, also called the Abbe's number, refers to the ratio of the difference in refractive index of an optical material at different wavelengths, and indicates the degree of dispersion of the material.

Refractive index, the ratio of the speed of light in vacuum (air) to the speed of light in the lens material, the higher the refractive index of the lens, the greater the ability to refract incident light. The higher the refractive index, the thinner the lens, i.e. the lens center thickness is the same, the same degree of the same material, and the thinner the lens edge with a higher refractive index than the lower refractive index.

The curvature radius, which is the inverse of the curvature, is defined by differentiation for the rotation rate of the tangential angle of a certain point on the curve to the arc length, indicating the degree to which the curve deviates from a straight line.

The focal length, also called focal length, is generally indicated by an effective focal length (EFFECTIVE FOCAL LENGTH, EFL for short) to distinguish from parameters such as front focal length, back focal length, etc. Focal length or effective focal length is a measure of the concentration or divergence of light in an optical system, which refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when an infinitely distant scene is rendered into a clear image at the focal plane by the lens or lens group. The distance from the center of the lens assembly to the imaging plane can be understood from a practical perspective.

The aperture is a device for controlling the light quantity of light entering the photosensitive surface of the camera module through the lens or the lens group, and is usually fixed in the camera module, and the size of the expressed aperture is expressed by an F# value.

The light quantity is how much light is irradiated onto the photosensitive surface through the lens or the lens group (lens assembly).

F#, which is the relative value (the inverse of the relative aperture) obtained from the focal length of the lens assembly/the diameter of the light passing through the lens assembly, is smaller, the more the amount of light is entered in the same unit time, the smaller the depth of field is, the blurring of the photographed background content occurs, and the effect similar to a tele lens is produced.

Total optical length (Total TRACK LENGTH, abbreviated as TTL), which is also called Total length, refers to the Total length from the object side surface of the first lens element (or the head of the lens element) adjacent to the object side to the imaging surface of the lens element on the optical axis, and is a main factor in forming the height of the camera module. In the present application, TTL may refer to a distance from an object side surface of the first lens element to a light sensing surface of the image sensor on an optical axis of the lens assembly.

Modulation transfer function (Modulation Transfer Function, MTF), an evaluation of the imaging quality of the system.

The electronic device provided by the embodiment of the application may include, but is not limited to, electronic devices with camera modules, such as mobile phones, tablet computers, notebook computers, ultra-mobile personal computer (UMPC), handheld computers, interphones, netbooks, POS (point of sale) machines, personal Digital Assistants (PDAs), wearable devices, virtual reality devices, vehicle-mounted devices, and the like.

In the embodiment of the present application, an electronic device is taken as an example of a mobile phone, and the mobile phone may be a board straightening machine, or the mobile phone may also be a folding machine, and specifically, the electronic device is taken as an example of a board straightening machine for explanation.

Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Referring to fig. 1, an electronic device 100 may include a housing 102 and a camera module 101, where the camera module 101 may be disposed on the housing 102, and the camera module 101 may be used to implement a shooting function, for example, may be used to shoot and record scenes such as video, photos, etc., where the shooting scenes may include various shooting scenes with different apertures, and may also include various complex and multiple shooting application scenes, such as indoor, outdoor, characters, environments, etc.

The camera module 101 may be located on a front surface of the electronic device 100 (a surface of the electronic device 100 having a display screen) for self-photographing or photographing other objects. Alternatively, as shown in fig. 1, the camera module 101 may be located on the back surface (the surface facing away from the display screen) of the electronic device 100, so as to be used for shooting other objects, and may be used for self-shooting.

The number of the camera modules 101 included in the electronic device 100 may be one, or the number of the camera modules 101 may be plural, so as to satisfy different shooting requirements.

The electronic device 100 may further include other structural components, for example, with continued reference to fig. 1, the electronic device 100 may further include a horn 103, where the horn 103 may be disposed on the housing 102, and the horn 103 may be used to play audio of the electronic device 100. A sound outlet (not shown) may be further provided in the housing 102, and may be used to form sound, and the sound outlet may be in communication with the horn 103 so that sound may propagate through the horn 103.

The electronic device 100 may further have a data interface 104, where the data interface 104 may be provided on the housing 102, and a control circuit board (not shown in the figure) may be further provided in the housing 102, and the control circuit board may be connected to the data interface 104. The data interface 104 may be used to implement power supply to the electronic device 100, or the data interface 104 may also be used to implement connection between the electronic device 100 and headphones, external multimedia devices, etc. (e.g., external cameras, external projection devices, etc.).

It should be understood that the illustrated structure of the embodiment of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the application, electronic device 100 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. For example, the electronic device 100 may also include sensors, processors, driving structures, flash lights, and the like.

The camera module generally comprises a lens assembly and an image sensor, light can enter the camera module from the lens assembly, specifically, light reflected by a photographed object can enter the lens assembly, and the light passes through the lens assembly to adjust and control a light path to generate a light image and irradiate the light image onto a light sensitive surface of the image sensor. The image sensor can realize a photoelectric conversion function, and the image sensor receives a light image and converts the light image into an electric signal for imaging display.

Therefore, the optical performance of the lens assembly can greatly influence the imaging quality and effect of the camera module, for example, the f-number of the lens assembly can influence the shooting of night scenes, the blurring of videos and backgrounds, the snapshot and other functions, the large-aperture design of the lens assembly is realized, the integral light inlet amount of the lens assembly is facilitated to be improved, and the imaging quality and the imaging effect of the camera module are further improved. When the lens component with the large aperture is used for shooting, the blurring background of the image and the main shooting body can be increased, the shutter speed and the focusing speed can be improved, and the camera module has more excellent imaging quality and effect.

The lens assembly is formed by arranging a plurality of lens elements, wherein the most adjacent object side of the lens elements is a first lens element, and the first lens element is usually a lens element made of a low refractive index high abbe number material, so that the first lens element can better correct the chromatic dispersion of an imaging system of the lens assembly. However, with the increasing demand of large aperture design, it is gradually difficult for the first lens with low refractive index and high abbe number to correct the monochromatic aberration that increases with the increase of aperture, resulting in poor optical quality of the lens assembly, affecting the imaging quality and effect, and making the monochromatic aberration a bottleneck that restricts the further increase of aperture of the camera module.

Based on this, the embodiment of the application provides a lens assembly, which enables the first lens to be a lens with high refractive index material, can better correct aberration to meet the design requirement of further increasing aperture, and realizes the ultra-large aperture design of the lens assembly and the high-quality imaging of the large aperture camera module by reasonably distributing the number, shape, focal power, material, position and the like of the lenses in the lens assembly.

The lens assembly and the camera module comprising the lens assembly provided by the embodiment of the application are described in detail below with reference to the accompanying drawings.

Fig. 2 is a schematic structural diagram of a camera module according to an embodiment of the present application.

Referring to fig. 2, the camera module 101 includes an image sensor 20 and a lens assembly 10, wherein the image sensor 20 is located on a side of the lens assembly 10 facing the image side, a photosurface (may also be referred to as an imaging surface) of the image sensor 20 may face the lens assembly 10, and light entering the camera module 101 may be irradiated onto the photosurface of the image sensor 20 after passing through the lens assembly 10, so as to implement imaging of the light.

The image sensor 20 may be a Charge-coupled Device (CCD) or may be a complementary metal oxide semiconductor (Compementary MetalOxide Semiconductor CMOS). Or may be other devices capable of implementing a photoelectric conversion function.

With continued reference to fig. 2, the camera module 101 may further include an optical filter 30, where the optical filter 30 may be located between the lens assembly 10 and the image sensor 20, and the light passing through the lens assembly 10 passes through the optical filter 30 and irradiates on the light sensing surface of the image sensor 20. The optical filter 30 has a filtering function, and can enable light rays in a specific wavelength range to pass through, so that stray light which is unfavorable for imaging is filtered, and imaging quality is improved.

The camera module 101 may further include an image processor, a memory, etc. (not shown in the figure), and the image sensor 20 may transmit the electrical signal to the image processor, the memory for processing or storing, etc., and then display the image of the photographed object through the display screen of the electronic device.

Of course, in some other examples, the camera module 101 may also include other structural components, such as a detection sensor, a driving motor, a circuit board, and the like.

The lens assembly 10 may include a plurality of lenses, for example, the lenses may be lens lenses respectively, each lens has optical power, the lenses may be sequentially arranged from an object side to an image side along an optical axis of the lens assembly 10, centers of the lenses may be coincident and located on the optical axis, two adjacent lenses are disposed at intervals, and an air gap is formed between the two adjacent lenses.

The lens assembly 10 may further include a lens barrel (not shown), in which a plurality of lenses may be disposed, and an optical axis of the lens assembly 10 may coincide with a central axis of the lens barrel. The lens barrel can be provided with a light hole at one end facing the object side along the optical axis, so that light can enter the lens barrel and sequentially pass through a plurality of lenses.

The optical filter 30 may be fixed to a lens barrel, for example, the optical filter 30 may be fixed to an end surface of the lens barrel facing the image side, and a through hole may be formed in an end surface of the lens barrel facing the image side, so that light emitted from the lens assembly 10 passes through the optical filter 30 and irradiates the image sensor 20.

The lens assembly 10 may further include a diaphragm 19, where the diaphragm 19 may be located on a side of the plurality of lenses facing the object side, that is, the diaphragm 19 may be disposed closer to the object side than the plurality of lenses, and the diaphragm 19 may be fixed inside the lens barrel, or the diaphragm 19 may be fixed outside the lens barrel. The light may first pass through the aperture 19 and then subsequently pass through a plurality of lenses before exiting. The diaphragm 19 can limit the light entering the lens assembly 10 to adjust the intensity of the light, and can be used to control the light entering amount of the lens assembly 10.

The number of lenses in the lens assembly 10 may be at least seven, for example, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, which are sequentially arranged from the object side to the image side along the optical axis. It is understood that the lens assembly 10 may include only seven lenses as described above, or the number of lenses of the lens assembly 10 may be greater than seven, i.e. one or more lenses are arranged sequentially from the seventh lens to the image side.

That is, taking the number of lenses as N as an example, the lens assembly 10 may include a first lens, a second lens, a third lens, … …, an N-1 lens, and an N-th lens sequentially arranged from an object side to an image side along an optical axis, where N may be a positive integer greater than or equal to 7. Among the lenses of the lens assembly 10, the lens disposed closest to the object side is a first lens, and the lens disposed adjacent to the first lens is a second lens disposed on the image side facing side of the first lens, and so on to the nth lens. The lens nearest to the image side is used as the end lens of the lens assembly, and the N-th lens is used as the end lens. The lens adjacent to the end lens and positioned on the side of the end lens facing the object side is taken as a secondary end lens, and then the N-1 th lens is taken as the secondary end lens.

For example, referring to fig. 2, taking the lens assembly 10 including eight lenses as an example, taking a broken line L in the drawing as an optical axis, the lens assembly includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18, respectively, which are sequentially arranged along the optical axis L.

The lens closest to the object side is the first lens 11, the lens closest to the image side is the eighth lens 18, i.e. the eighth lens 18 is the end lens of the lens assembly 10, and the seventh lens 17 adjacent to the eighth lens 18 is the secondary end lens. After entering the camera module 101, the light passes through the diaphragm 19, 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 and the optical filter 30 in sequence, and then irradiates on the light sensitive surface of the image sensor 20.

The refractive index ind1 of the first lens 11 is in a range of ind1 > 1.70, that is, the first lens 11 is a lens made of a high refractive index material, so that the bending capability of the first lens 11 to light is improved, and monochromatic aberration can be better corrected, thereby meeting the design requirement of further increasing the aperture, improving the optical quality of the large aperture lens assembly 10, and being beneficial to improving the imaging quality and effect of the camera module with large aperture design.

The lens closest to the image side in the lens assembly 10 has negative focal power, and at least two lenses among the plurality of lenses closest to the image side and the first lens 11 can have positive focal power respectively, so that the number of lenses in the lens assembly and the focal power of each lens are reasonably distributed, and the large aperture design is facilitated. Taking the lens assembly 10 of fig. 2 as an example, that is, the eighth lens 18 has negative optical power, at least two of the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16 and the seventh lens 17 between the eighth lens 18 and the first lens 11 have positive optical power, for example, the fourth lens 14 and the fifth lens 15 may have positive optical power, respectively.

It is understood that only two lenses of the plurality of lenses disposed closest to the image side and the first lens 11 may have positive power, or more than two lenses may have positive power, respectively, for example, the lens assembly 10 in fig. 2 may be taken as an example, and the fourth lens 14, the fifth lens 15, and the seventh lens 17 may have positive power, respectively. The number of lenses with positive optical power can be selected and set according to the actual collocation requirement.

The air gap between the second lens element 12 and the third lens element 13 is SP23, that is, SP23 is the distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis. The center thickness of the second lens element 12 is CT2, that is, CT2 is the distance between the object side surface of the second lens element 12 and the image side surface of the second lens element 12 on the optical axis. The center thickness of the third lens element 13 is CT3, that is, CT3 is the distance between the object side surface of the third lens element 13 and the image side surface of the third lens element 13 on the optical axis.

The second lens 12 and the third lens 13 can meet the requirement of SP 23/(CT 2+CT3) less than or equal to 1.3 and less than or equal to 2, and the smooth transition of light between the second lens 12 and the third lens 13 is facilitated. And the sum of the center thicknesses of the second lens 12 and the third lens 13 is smaller than the air gap between the second lens 12 and the third lens 13, and the second lens 12 and the third lens 13 can be both lenses made of high refractive index low abbe number materials, so that on one hand, the optical power of the second lens 12 and the third lens 13 and the shapes and positions of the second lens 12 and the third lens 13 are reasonably distributed, aberration correction is facilitated, and large aperture design is facilitated. On the other hand, the optical total length of the lens assembly is reduced, the second lens 12 and the third lens 13 are guaranteed to have good processing performance, and the production implementation is facilitated.

In summary, the lens assembly 10 can better correct aberration to meet the design requirement of further increasing aperture through making the first lens 11 be a lens with high refractive index material, so as to ensure that the large aperture camera module 101 has excellent imaging quality and effect, and realize the ultra-large aperture design of the lens assembly 10, that is, realize the high quality imaging of the camera module with large aperture design through reasonably distributing the number of lenses, the focal power of each lens, the materials, shapes and positions of the first lens 11, the second lens 12 and the third lens 13, etc.

Specifically, with the effective focal length of the lens assembly 10 being F, the entrance pupil diameter of the lens assembly 10 being EPD, the f# =f/EPD of the lens assembly 10, the f# of the lens assembly 10 may be less than or equal to 1.3, and the aperture of the lens assembly may be increased. The f# of the conventional large aperture design lens assembly is more than 1.4, that is, the f# of the lens assembly 10 provided by the embodiment of the application is much smaller than that of the conventional lens assembly, and the lens assembly 10 has an ultra-large aperture, so that the requirement of gradually increasing aperture design is met, the light inlet amount of the lens assembly is improved, and the camera module 101 has excellent imaging quality and effect.

The optical total length of the lens assembly 10 is TTL, the half image height of the lens assembly 10 is IMH, the ratio of the optical total length to the half image height of the lens assembly 10 can meet the requirements that TTL/IMH is less than or equal to 2, and the lens assembly 10 has smaller optical total length under the condition of ensuring excellent imaging quality and effect, so that the length dimension of the lens assembly 10 is reduced, the thinning design of the camera module 101 is conveniently realized, and the ultra-thin camera module with ultra-large aperture and high imaging quality is obtained.

The lenses included in the lens assembly 10 may be aspheric lenses, for example, aspheric lenses, and the aspheric lenses may reduce or eliminate spherical aberration and distortion aberration introduced by the spherical lenses, which is further beneficial to realizing the large aperture performance of the lens assembly 10 and reducing the total length of the lens assembly.

The number of lenses can be less than or equal to nine, namely the range of the number N of lenses meets the condition that N is less than or equal to 7 and less than or equal to 9, and under the condition that the number of lenses is reasonably distributed to realize large aperture design, the total optical length of the lens assembly 10 is further reduced, and the thinning design of the camera module 101 is more conveniently realized.

It is understood that the lens assembly 10 may include seven lenses (shown in fig. 3), such as a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16 and a seventh lens 17, which are sequentially arranged from an object side to an image side, respectively, the first lens 11 being a lens closest to the object side, the sixth lens 16 being a secondary end lens, and the seventh lens 17 being an end lens closest to the image side.

Alternatively, the lens assembly 10 may also include eight lenses, as shown in fig. 2, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18, which are arranged in order from the object side to the image side, the first lens 11 being the lens closest to the object side, the seventh lens 17 being the secondary end lens, and the eighth lens 18 being the end lens closest to the image side.

Or the lens assembly may also comprise nine lenses, such as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, which are arranged in order from the object side to the image side, respectively, wherein the first lens is a lens nearest to the object side, the eighth lens is a secondary end lens, and the ninth lens is an end lens nearest to the image side.

The first lens 11 may have positive focal power, the second lens 12 may have negative focal power, the second lens may have positive focal power, and the end lens may have negative focal power, which may further reasonably distribute the focal power, and facilitate the ultra-large aperture design of the lens assembly 10. In addition, the optical power matching of the first lens 11 and the second lens 12, and the optical power matching of the end lens and the secondary end lens are also beneficial to correcting aberration, and further improving imaging quality and effect.

For example, taking the lens assembly 10 of fig. 2 including eight lenses as an example, the first lens 11 may have positive power, the second lens 12 may have negative power, the seventh lens 17 may have positive power, and the eighth lens 18 may have negative power.

Accordingly, when the lens assembly 10 includes seven lenses, the first lens 11 and the sixth lens 16 may have positive power, and the second lens 12 and the eighth lens 18 may have negative power, respectively. When the lens assembly 10 includes nine lenses, the first lens and the eighth lens may have positive optical power, respectively, and the second lens and the ninth lens may have negative optical power, respectively.

At least one of the object-side and image-side surfaces of the end lens may include a inflection point to define the shape of the end lens, which may facilitate further correction of aberrations of the lens assembly 10to enhance imaging quality and effectiveness. For example, taking the lens assembly 10 of FIG. 2 as an example, the image-side surface of the eighth lens element 18 can include a inflection point O such that the image-side surface of the eighth lens element 18 is curved in an M-shape as shown in FIG. 2

The image side surface of the end lens can only include a inflection point, or the object side surface of the end lens can only include an inflection point, or the image side surface and the object side surface of the end lens can respectively include an inflection point, which can be selected and set according to actual requirements.

At least one of the object-side and image-side surfaces of the secondary end lens may include a inflection point defining the shape of the secondary end lens, and may also facilitate further correction of aberrations of the lens assembly 10 to enhance imaging quality and effectiveness. For example, taking a lens assembly 10 with eight lenses as an example, the object-side surface of the seventh lens element 17 may include a inflection point such that the object-side surface of the seventh lens element 17 is an M-shaped curved surface.

Wherein the inflection point may be included only on the object side of the secondary lens, or may be included only on the image side of the secondary lens, or may be included on the object side and the image side of the secondary lens, respectively.

Accordingly, when the lens assembly 10 includes seven lenses, at least one of the object side and the image side of the sixth lens may include a inflection point, and at least one of the object side and the image side of the seventh lens may include a inflection point. When the lens assembly 10 includes nine lenses, at least one of the object-side surface and the image-side surface of the eighth lens element may include a inflection point, and at least one of the object-side surface and the image-side surface of the ninth lens element may include a inflection point.

In the embodiment of the present application, the lens assembly 10 has seven lenses, i.e. when the lens assembly 10 includes seven lenses, such as the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16 and the seventh lens 17 (refer to fig. 3), the end lens is the seventh lens 17, and the sub-end lens is the sixth lens 16.

The first lens 11 may have positive power, the second lens 12 may have negative power, the fifth lens 15 may have negative power, the sixth lens 16 may have positive power, and the seventh lens 17 may have negative power, and the powers of the respective lenses are further reasonably distributed, so that the aperture is further increased.

The portion of the object side surface of the first lens element 11 corresponding to at least the optical axis may be convex, the portion of the image side surface of the second lens element 12 corresponding to at least the optical axis may be concave, the portion of the image side surface of the fourth lens element 14 corresponding to at least the optical axis may be convex, the portion of the object side surface of the sixth lens element 16 corresponding to at least the optical axis may be convex, the portion of the object side surface of the seventh lens element 17 corresponding to at least the optical axis may be convex, and the portion of the image side surface of the seventh lens element 17 corresponding to at least the optical axis may be concave. The focal power and the shape of seven lenses can be further and reasonably distributed, so that aberration correction is facilitated, high-quality imaging of the lens assembly 10 is realized, the total optical length of the lens assembly 10 is reduced, and thinning design of the camera module is facilitated.

The radius of curvature of the object side surface of the first lens 11 is R11, the focal length of the first lens 11 is f1, the ratio of the radius of curvature of the object side surface of the first lens 11 to the focal length can meet the requirement that R11/f1 is less than or equal to 0.6 and less than or equal to 0.85, the focal power and the shape of the first lens 11 are further reasonably distributed, and the imaging quality and the imaging effect are improved.

The curvature radius of the image side surface of the first lens 11 is R12, and the ratio of the curvature radius of the image side surface of the first lens 11 to the curvature radius of the object side surface can meet R12/R11 not less than 4, so that the first lens 11 has good machinability and is convenient to process and realize.

With the maximum sagittal height of the image side of the second lens 12 being SAG22, the sagittal height of the image side refers to the sagittal height of the aspherical image side, which can be obtained by the sagittal calculation formula (see Wen Shigao z calculation formula below). Where SAG22 is the maximum of the absolute values of the sagittal height z.

The ratio of the maximum sagittal height of the image side surface of the second lens 12 to the center thickness CT2 of the second lens 12 can satisfy 1.8-3 SAG22/CT2, ensuring good workability of the second lens 12, and reasonably controlling the contribution of the second lens 12 to aberration, thereby being beneficial to improving the resolving power of the lens assembly 10.

The effective focal length of the lens group formed by the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 is f1234, the ratio of the effective focal length of the lens group to the effective focal length of the lens assembly 10 can meet the requirement that f1234/f is less than or equal to 2, the focal power of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 is reasonably distributed, and under the condition of realizing ultra-large aperture design, aberration correction is further facilitated, so that imaging quality and imaging effect are improved.

When the lens assembly 10 is eight-piece, i.e., the lens assembly 10 includes eight lenses, such as 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, and the eighth lens 18, respectively, shown in fig. 2, the end lens is the eighth lens 18, and the minor end lens is the seventh lens 17.

The first lens 11 may have positive power, the second lens 12 may have negative power, the sixth lens 16 may have negative power, the seventh lens 17 may have positive power, and the eighth lens 18 may have negative power, further reasonably distributing the powers of the respective lenses, facilitating further increase of the aperture.

The portion of the object side surface of the first lens element 11 corresponding to at least the optical axis may be convex, the portion of the image side surface of the second lens element 12 corresponding to at least the optical axis may be concave, the portion of the object side surface of the third lens element 13 corresponding to at least the optical axis may be convex, the portion of the image side surface of the sixth lens element 16 corresponding to at least the optical axis may be concave, the portion of the object side surface of the seventh lens element 17 corresponding to at least the optical axis may be convex, the portion of the object side surface of the eighth lens element 18 corresponding to at least the optical axis may be convex, and the portion of the image side surface of the eighth lens element 18 corresponding to at least the optical axis may be concave. The optical power and the shape of eight lenses can be further and reasonably distributed, the aberration correction is facilitated, the high-quality imaging of the lens assembly 10 is realized, the optical total length of the lens assembly 10 is reduced, and the thinning design of the camera module is facilitated.

With the central thickness of the first lens 11 being CT1, CT1 is the distance between the object side surface of the first lens 11 and the image side surface of the first lens 11 on the optical axis, and the ratio of the central thickness of the first lens 11 to the central thickness of the second lens 12 can satisfy 3.ltoreq.ct 1/CT 2.ltoreq.5, which is beneficial to improving the smoothness of the transition of the optical fiber between the first lens 11 and the second lens 12, and further improving the imaging quality and effect.

With the focal length of the second lens element 12 being f2, the object-side radius of curvature of the second lens element 12 being R21, and the image-side radius of curvature of the second lens element 12 being R22, the second lens element 12 can satisfy 0.8 +.2/(r21+r22) +.3, and further define the shape of the second lens element 12, so as to achieve the purpose of improving the processability of the second lens element 12, and further control the aberration contribution of the second lens element 12, thereby improving the imaging quality and effect.

With the focal length of the third lens 13 being f3, the radius of curvature of the object side of the third lens 13 being R31, the radius of curvature of the image side of the third lens 13 being R32, the third lens 13 can satisfy 1.2 +.f3|/(r31+r32) +.3, and the shape of the third lens 13 is further defined to improve the workability of the third lens 13, and at the same time, the aberration contribution of the third lens 13 is controlled, which is beneficial to improving the imaging quality and effect.

The effective focal length of the lens group formed by the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 and the effective focal length of the lens assembly 10 can also satisfy that f1234/f is not less than 1 and not more than 2, so that the optical power of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 can be reasonably distributed.

The structure and performance of the lens assembly provided by the present application are described below with reference to specific embodiments.

Example 1

Fig. 3 is a schematic diagram of a simulation structure of a camera module according to an embodiment of the application.

In the present embodiment, the lens assembly 10 may include seven lenses, and as shown in fig. 3, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 may be sequentially included from the object side to the image side along the optical axis L.

The light entering the camera module 101 sequentially passes through the diaphragm 19, 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 and the optical filter 30, and then irradiates onto the photosensitive surface of the image sensor 20, and finally forms an image on the photosensitive surface.

The first lens 11 may have positive optical power, and at least a portion of the object side surface of the first lens 11 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the first lens 11 corresponding to the optical axis may be concave.

The second lens 12 can have negative optical power, at least a portion of the object side surface of the second lens 12 corresponding to the optical axis can be convex, and at least a portion of the image side surface of the second lens 12 corresponding to the optical axis can be concave.

The third lens 13 may have negative optical power, at least a portion of the object side surface of the third lens 13 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the third lens 13 corresponding to the optical axis may be concave.

The fourth lens element 14 can have positive optical power, at least a portion of the object-side surface of the fourth lens element 14 corresponding to the optical axis can be convex, and at least a portion of the image-side surface of the fourth lens element 14 corresponding to the optical axis can be convex.

The fifth lens 15 may have negative optical power, at least a portion of the object side surface of the fifth lens 15 corresponding to the optical axis may be concave, and at least a portion of the image side surface of the fifth lens 15 corresponding to the optical axis may be convex.

The sixth lens 16 may have positive optical power, at least a portion of the object side surface of the sixth lens 16 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the sixth lens 16 corresponding to the optical axis may be concave.

The seventh lens 17 may have negative optical power, at least a portion of the object side surface of the seventh lens 17 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the seventh lens 17 corresponding to the optical axis may be concave.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.892, the center thickness CT2 of the second lens element 12=0.300, and the center thickness CT3 of the third lens element 13=0.335, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.41.

F# =f/epd=1.25 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.31 mm, the half image height IMH of the lens assembly 10=6.30 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.48.

The radius of curvature r11=4.538 mm of the object side of the first lens 11, the focal length f1=6.52 mm of the first lens 11, and the ratio r11/f1=0.70 of the radius of curvature R11 of the object side of the first lens 11 to the focal length f1 of the first lens 11.

The curvature radius r12= 21.990 of the image side of the first lens 11, and the ratio r12/r11=4.85 of the curvature radius R12 of the image side of the first lens 11 to the curvature radius R11 of the object side of the first lens 11.

The ratio SAG 22/ct2=2.02 of the maximum sagittal height SAG22 of the image side of the second lens 12 to the central thickness CT2 of the second lens 12.

The ratio f 1234/f=1.41 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

Table 1.1 below shows optical parameters of each optical element in a camera module according to a first embodiment of the present application.

Wherein L1 is the first lens 11, L2 is the second lens 12, L3 is the third lens 13, L4 is the fourth lens 14, L5 is the fifth lens 15, L6 is the sixth lens 16, L7 is the seventh lens 17, and ir is the filter 30.

S is an object side or image side of an optical element (e.g., a lens, a filter, etc.), S1 and S2 are an object side and an image side of the first lens 11, S3 and S4 are an object side and an image side of the second lens 12, S5 and S6 are an object side and an image side of the third lens 13, S7 and S8 are an object side and an image side of the fourth lens 14, S9 and S10 are an object side and an image side of the fifth lens 15, S11 and S12 are an object side and an image side of the sixth lens 16, S13 and S14 are an object side and an image side of the seventh lens 17, and S15 and S16 are an object side and an image side of the filter 30, respectively.

The thickness is the thickness of the optical element in the direction along the optical axis or the thickness of the air gap between the optical elements. The thickness of the diaphragm 19 corresponds to the distance between the diaphragm 19 and the object side surface of the first lens element 11 along the optical axis, the thickness of the object side surface of the first lens element 11 corresponds to the thickness of the first lens element 11 along the optical axis, the thickness of the image side surface of the first lens element 11 corresponds to the distance between the image side surface of the first lens element 11 and the object side surface of the second lens element 12 along the optical axis, and so on.

Table 1.2 shows aspherical coefficients of each lens in a lens assembly according to a first embodiment of the present application.

As can be seen from table 1.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 14 aspherical surfaces, and the aspherical surface profile z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile and the like, and finally the camera module 101 shown in fig. 3 is obtained.

It should be noted that the aspherical surface type z of each lens in the lens assembly 10 may be defined by other types of aspherical formulas.

The optical parameters of the lens assembly 10 composed of the above lenses can be seen in table 1.3 below.

Table 1.3 shows optical parameters of a lens assembly according to a first embodiment of the present application.

Focal length f/mm	6.67
		F#, f#	1.25
Half image height IMH/mm	6.30
		FOV/degree of field angle	84.92
Optical total length/mm	9.31

As can be seen from table 1.3, the lens assembly 10 provided in the first embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 4 is a graph of a modulation transfer function of a camera module according to an embodiment of the application.

The abscissa in fig. 4 represents different frequencies, the ordinate represents modulation contrast, imaging resolving power of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, the dotted line in the figure represents a meridional view field, and as can be seen from fig. 4, the camera module has excellent imaging quality, and high-quality imaging of the large-aperture ultrathin camera module can be realized.

Example two

Fig. 5 is a schematic diagram of a simulation structure of a camera module according to a second embodiment of the present application.

In the present embodiment, the lens assembly 10 may include seven lenses, and as shown in fig. 5, along the optical axis L, from the object side to the image side, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 may be sequentially included.

The fifth lens 15 may have negative optical power, at least a portion of the object side surface of the fifth lens 15 corresponding to the optical axis may be concave, and at least a portion of the image side surface of the fifth lens 15 corresponding to the optical axis may be concave.

The sixth lens 16 may have positive optical power, at least a portion of the object side surface of the sixth lens 16 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the sixth lens 16 corresponding to the optical axis may be convex.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.990, the center thickness CT2 of the second lens element 12=0.300, and the center thickness CT3 of the third lens element 13=0.305, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.64.

F# =f/epd=1.20 for the lens assembly 10.

The total optical length ttl= 9.561mm of the lens assembly 10, the half image height imh=6.30 mm of the lens assembly 10, and the ratio of the total optical length TTL to the half image height IMH of the lens assembly 10 TTL/imh=1.52.

The radius of curvature r11= 4.678mm of the object side of the first lens 11, the focal length f1=6.54 mm of the first lens 11, and the ratio r11/f1=0.72 of the radius of curvature R11 of the object side of the first lens 11 to the focal length f1 of the first lens 11.

The curvature radius r12= 25.746 of the image side surface of the first lens 11, and the ratio r12/r11=5.50 of the curvature radius R12 of the image side surface of the first lens 11 to the curvature radius R11 of the object side surface of the first lens 11.

The ratio SAG 22/ct2=2.27 of the maximum sagittal height SAG22 of the image side of the second lens 12 to the central thickness CT2 of the second lens 12.

The ratio f 1234/f=1.40 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

Table 2.1 below shows optical parameters of each optical element in a camera module according to a second embodiment of the present application.

S is an object side or image side of an optical element (such as a lens, a filter, etc.), and specific meanings of S1, S2 … … S16 can be found in the first embodiment, and are not described in detail in this embodiment.

The meaning of the parameters such as thickness can also be referred to in the first embodiment, and will not be described in detail in this embodiment.

Table 2.2 shows aspherical coefficients of each lens in a lens assembly according to a second embodiment of the present application.

As can be seen from table 2.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 14 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 5.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 2.3 below.

Table 2.3 shows optical parameters of a lens assembly according to a second embodiment of the present application.

Focal length f/mm	6.77
		F#, f#	1.20
Half image height IMH/mm	6.30
		FOV/degree of field angle	84.03
Optical total length/mm	9.56

As can be seen from table 2.3, the lens assembly 10 provided in the second embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 6 is a graph of a modulation transfer function of a camera module according to a second embodiment of the present application.

The abscissa in fig. 6 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 6, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example III

Fig. 7 is a schematic diagram of a simulation structure of a camera module according to a third embodiment of the present application.

In the present embodiment, the lens assembly 10 may include seven lenses, and as shown in fig. 7, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 may be sequentially included from the object side to the image side along the optical axis L.

The refractive index ind1=1.85 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis is SP 23= 1.076, the center thickness CT2 of the second lens element 12 is=0.300, the center thickness CT3 of the third lens element 13 is=0.328, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.71.

F# =f/epd=1.15 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.81 mm, the half image height IMH of the lens assembly 10=6.30 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.56.

The radius of curvature r11= 4.833mm of the object side of the first lens 11, the focal length f1=6.55 mm of the first lens 11, and the ratio r11/f1=0.74 of the radius of curvature R11 of the object side of the first lens 11 to the focal length f1 of the first lens 11.

The curvature radius r12= 32.079 of the image side of the first lens 11, and the ratio r12/r11=6.64 of the curvature radius R12 of the image side of the first lens 11 to the curvature radius R11 of the object side of the first lens 11.

The ratio SAG 22/ct2=2.37 of the maximum sagittal height SAG22 of the image side of the second lens 12 to the central thickness CT2 of the second lens 12.

The ratio f 1234/f=1.38 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

Table 3.1 below shows optical parameters of each optical element in a camera module according to a third embodiment of the present application.

Table 3.2 shows aspherical coefficients of each lens in a lens assembly according to a third embodiment of the present application.

As can be seen from table 3.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 14 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 7.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 3.3 below.

Table 3.3 shows optical parameters of a lens assembly according to a third embodiment of the present application.

Focal length f/mm	6.89
		F#, f#	1.15
Half image height IMH/mm	6.30
		FOV/degree of field angle	84.15
Optical total length/mm	9.81

As can be seen from table 3.3, the lens assembly 10 provided in the third embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 8 is a graph of a modulation transfer function of a camera module according to a third embodiment of the present application.

The abscissa in fig. 8 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 8, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example IV

Fig. 9 is a schematic diagram of a simulation structure of a camera module according to a fourth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include seven lenses, and as shown in fig. 9, along the optical axis L, from the object side to the image side, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 may be sequentially included.

The fifth lens 15 may have negative optical power, at least a portion of the object side surface of the fifth lens 15 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the fifth lens 15 corresponding to the optical axis may be concave.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis is SP 23=1.134, the center thickness CT2 of the second lens element 12 is CT 2=0.300, the center thickness CT3 of the third lens element 13 is CT 3=0.452, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.51.

F# =f/epd=1.10 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.96 mm, the half image height IMH of the lens assembly 10=6.30 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.58.

The radius of curvature r11= 5.308mm of the object side of the first lens 11, the focal length f1=6.81 mm of the first lens 11, and the ratio r11/f1=0.78 of the radius of curvature R11 of the object side of the first lens 11 to the focal length f1 of the first lens 11.

The curvature radius r12= 54.789 of the image side of the first lens 11, and the ratio r12/r11=10.32 of the curvature radius R12 of the image side of the first lens 11 to the curvature radius R11 of the object side of the first lens 11.

The ratio f 1234/f=1.62 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

Table 4.1 below shows optical parameters of each optical element in a camera module according to a fourth embodiment of the present application.

Table 4.2 shows aspherical coefficients of each lens in a lens assembly according to a fourth embodiment of the present application.

As can be seen from table 4.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 14 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 as shown in fig. 9.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 4.3 below.

Table 4.3 shows optical parameters of a lens assembly according to a fourth embodiment of the present application.

Focal length f/mm	6.65
		F#, f#	1.10
Half image height IMH/mm	6.30
		FOV/degree of field angle	86.73
Optical total length/mm	9.96

As can be seen from table 4.3, the lens assembly 10 provided in the fourth embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 10 is a graph of a modulation transfer function of a camera module according to a fourth embodiment of the present application.

The abscissa in fig. 10 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 10, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example five

Fig. 11 is a schematic diagram of a simulation structure of a camera module according to a fifth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include seven lenses, and as shown in fig. 11, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 may be sequentially included from the object side to the image side along the optical axis L.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis is SP 23=1.165, the center thickness CT2 of the second lens element 12 is CT 2=0.300, the center thickness CT3 of the third lens element 13 is CT 3=0.570, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.34.

F# =f/epd=1.05 for the lens assembly 10.

The total optical length TTL of the lens assembly 10=10.09 mm, the half image height IMH of the lens assembly 10=6.30 mm, and the ratio of the total optical length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.60.

The radius of curvature r11=5.496 mm of the object side of the first lens 11, the focal length f1=6.97 mm of the first lens 11, and the ratio r11/f1=0.79 of the radius of curvature R11 of the object side of the first lens 11 to the focal length f1 of the first lens 11.

The curvature radius r12= 64.557 of the image side of the first lens 11, and the ratio r12/r11=11.75 of the curvature radius R12 of the image side of the first lens 11 to the curvature radius R11 of the object side of the first lens 11.

The ratio SAG 22/ct2=2.46 of the maximum sagittal height SAG22 of the image side of the second lens 12 to the central thickness CT2 of the second lens 12.

Table 5.1 below shows optical parameters of each optical element in a camera module according to a fifth embodiment of the present application.

Table 5.2 shows aspherical coefficients of each lens in a lens assembly according to a fifth embodiment of the present application.

As can be seen from table 5.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 14 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 11.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 5.3 below.

Table 5.3 shows optical parameters of a lens assembly according to a fifth embodiment of the present application.

Focal length f/mm	6.66
		F#, f#	1.05
Half image height IMH/mm	6.30
		FOV/degree of field angle	86.64
Optical total length/mm	10.09

As can be seen from table 5.3, the lens assembly 10 provided in the fifth embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 12 is a graph of a modulation transfer function of a camera module according to a fifth embodiment of the present application.

The abscissa in fig. 12 shows different frequencies, the ordinate shows modulation contrast, imaging resolution at different spatial frequencies can be reflected, the solid line in the figure shows a sagittal view field, and the broken line in the figure shows a meridional view field. As can be seen from fig. 12, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example six

Fig. 13 is a schematic diagram of a simulation structure of a camera module according to a sixth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include seven lenses, and as shown in fig. 13, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, and the seventh lens 17 may be sequentially included from the object side to the image side along the optical axis L.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=1.067, the center thickness CT2 of the second lens element 12=0.300, and the center thickness CT3 of the third lens element 13=0.358, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.62.

F# =f/epd=1.15 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.51 mm, the half image height IMH of the lens assembly 10=6.30 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.51.

The radius of curvature r11= 4.820mm of the object side of the first lens 11, the focal length f1=6.53 mm of the first lens 11, and the ratio r11/f1=0.74 of the radius of curvature R11 of the object side of the first lens 11 to the focal length f1 of the first lens 11.

The curvature radius r12= 31.329 of the image side of the first lens 11, and the ratio r12/r11=6.50 of the curvature radius R12 of the image side of the first lens 11 to the curvature radius R11 of the object side of the first lens 11.

The ratio SAG 22/ct2=2.30 of the maximum sagittal height SAG22 of the image side of the second lens 12 to the central thickness CT2 of the second lens 12.

Table 6.1 below shows optical parameters of each optical element in a camera module according to a sixth embodiment of the present application.

Table 6.2 shows aspherical coefficients of each lens in a lens assembly according to a sixth embodiment of the present application.

As can be seen from table 6.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 14 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 as shown in fig. 13.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 6.3 below.

Table 6.3 shows the optical parameters of a lens assembly according to the sixth embodiment of the present application.

Focal length f/mm	6.85
		F#, f#	1.15
Half image height IMH/mm	6.30
		FOV/degree of field angle	83.72
Optical total length/mm	9.51

As can be seen from table 6.3, the lens assembly 10 provided in the sixth embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 14 is a graph of a modulation transfer function of a camera module according to a sixth embodiment of the present application.

The abscissa in fig. 14 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 14, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example seven

Fig. 15 is a schematic diagram of a simulation structure of a camera module according to a seventh embodiment of the present application.

In the present embodiment, the lens assembly 10 may include eight lenses, and may include, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 along the optical axis L, as shown in fig. 15.

The light entering the camera module 101 sequentially passes through the diaphragm 19, 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 and the optical filter 30, and then irradiates onto the photosensitive surface of the image sensor 20, and finally forms an image on the photosensitive surface.

The fifth lens 15 may have positive optical power, at least a portion of the object side surface of the fifth lens 15 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the fifth lens 15 corresponding to the optical axis may be concave.

The sixth lens 16 may have negative optical power, at least a portion of the object side surface of the sixth lens 16 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the sixth lens 16 corresponding to the optical axis may be concave.

The seventh lens 17 may have positive optical power, at least a portion of the object side surface of the seventh lens 17 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the seventh lens 17 corresponding to the optical axis may be convex.

The eighth lens element 18 can have a negative optical power, at least a portion of the object-side surface of the eighth lens element 18 corresponding to the optical axis can be convex, and at least a portion of the image-side surface of the eighth lens element 18 corresponding to the optical axis can be concave.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis is SP 23= 1.191, the center thickness CT2 of the second lens element 12 is=0.300, the center thickness CT3 of the third lens element 13 is=0.310, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.95.

F# =f/epd=1.05 for the lens assembly 10.

The total optical length TTL of the lens assembly 10=10.45 mm, the half image height IMH of the lens assembly 10=6.43 mm, and the ratio of the total optical length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.63.

The central thickness CT1 = 1.052 of the first lens 11, and the ratio CT1/CT2 = 3.50 of the central thickness of the first lens 11 to the central thickness of the second lens 12.

The ratio f 1234/f=1.81 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

The focal length f2= -19.21 of the second lens 12, the radius of curvature r21= 4.595 of the object-side surface of the second lens 12, the radius of curvature r22= 3.318 of the image-side surface of the second lens 12, the second lens 12 satisfying |f2|/(r21+r22) =2.43.

The focal length f3= -52.55 of the third lens 13, the radius of curvature r31= 20.826 of the object side of the third lens 13, the radius of curvature r32= 13.128 of the image side of the third lens 13, the third lens 13 satisfying |f3|/(r31+r32) =1.55.

Table 7.1 below shows optical parameters of each optical element in a camera module according to a seventh embodiment of the present application.

Wherein L1 is the first lens 11, L2 is the second lens 12, L3 is the third lens 13, L4 is the fourth lens 14, L5 is the fifth lens 15, L6 is the sixth lens 16, L7 is the seventh lens 17, L8 is the eighth lens 18, and ir is the filter 30.

S is an object side or image side of an optical element (e.g., lens, filter, etc.), S1 and S2 are an object side and an image side of the first lens 11, S3 and S4 are an object side and an image side of the second lens 12, S5 and S6 are an object side and an image side of the third lens 13, S7 and S8 are an object side and an image side of the fourth lens 14, S9 and S10 are an object side and an image side of the fifth lens 15, S11 and S12 are an object side and an image side of the sixth lens 16, S13 and S14 are an object side and an image side of the seventh lens 17, S15 and S16 are an object side and an image side of the eighth lens 18, and S17 and S18 are an object side and an image side of the filter 30, respectively.

Table 7.2 shows aspherical coefficients of each lens in a lens assembly according to a seventh embodiment of the present application.

As can be seen from table 7.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 16 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 as shown in fig. 15.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 7.3 below.

Table 7.3 shows optical parameters of a lens assembly according to a seventh embodiment of the present application.

Focal length f/mm	6.68
		F#, f#	1.05
Half image height IMH/mm	6.43
		FOV/degree of field angle	86.19
Optical total length/mm	10.45

As can be seen from table 7.3, the lens assembly 10 provided in the seventh embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 16 is a graph of a modulation transfer function of a camera module according to a seventh embodiment of the present application.

The abscissa in fig. 16 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 16, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example eight

Fig. 17 is a schematic diagram of a simulation structure of a camera module according to an eighth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include eight lenses in number, and may include, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 along the optical axis L, as shown in fig. 17.

The seventh lens 17 may have positive optical power, at least a portion of the object side surface of the seventh lens 17 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the seventh lens 17 corresponding to the optical axis may be concave.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.946, the center thickness CT2 of the second lens element 12=0.300, and the center thickness CT3 of the third lens element 13=0.349, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.46.

F# =f/epd=1.11 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=10.00 mm, the half image height IMH of the lens assembly 10=6.43 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.56.

The central thickness CT1 = 1.081 of the first lens 11, and the ratio CT1/CT2 = 3.60 of the central thickness of the first lens 11 to the central thickness of the second lens 12.

The ratio f 1234/f=1.50 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

The focal length f2= -11.51 of the second lens 12, the radius of curvature r21= 7.848 of the object-side surface of the second lens 12, the radius of curvature r22= 3.877 of the image-side surface of the second lens 12, the second lens 12 satisfying |f2|/(r21+r22) =0.98.

The focal length f3= -61.12 of the third lens 13, the radius of curvature r31= 14.887 of the object-side surface of the third lens 13, the radius of curvature r32= 10.885 of the image-side surface of the third lens 13, and the third lens 13 satisfies |f3|/(r31+r32) =2.37.

Table 8.1 below shows optical parameters of each optical element in a camera module according to an eighth embodiment of the present application.

S is an object side or image side of an optical element (such as a lens, a filter, etc.), and specific meanings of S1, S2 … … S18 can be found in the seventh embodiment, which is not described in detail in this embodiment.

The meaning of the parameters such as thickness can also be referred to in embodiment seven, and will not be described in detail in this embodiment.

Table 8.2 shows aspherical coefficients of each lens in a lens assembly according to an eighth embodiment of the present application.

As shown in table 8.2, each lens in the lens assembly 10 is an aspheric lens, the lens assembly 10 includes 16 aspheric surfaces, and the aspheric surface type Z of each lens in the lens assembly 10 can be calculated by the following aspheric surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated based on the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 17.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 8.3 below.

Table 8.3 shows optical parameters of a lens assembly according to an eighth embodiment of the present application.

Focal length f/mm	6.65
		F#, f#	1.11
Half image height IMH/mm	6.43
		FOV/degree of field angle	86.98
Optical total length/mm	10.00

As can be seen from table 8.3, the lens assembly 10 according to the eighth embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 18 is a graph of a modulation transfer function of a camera module according to an eighth embodiment of the present application.

The abscissa in fig. 18 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 18, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example nine

Fig. 19 is a schematic diagram of a simulation structure of a camera module according to a ninth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include eight lenses, and may include, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 along the optical axis L, as shown in fig. 19.

The fifth lens 15 may have positive optical power, at least a portion of the object side surface of the fifth lens 15 corresponding to the optical axis may be convex, and at least a portion of the image side surface of the fifth lens 15 corresponding to the optical axis may be convex.

The refractive index ind1=1.85 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.837, the center thickness CT2 of the second lens element 12=0.310, and the center thickness CT3 of the third lens element 13=0.300, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.37.

F# =f/epd=1.15 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.58 mm, the half image height IMH of the lens assembly 10=6.43 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.49.

The central thickness CT1 = 1.081 of the first lens 11, the ratio CT1/CT2 = 3.49 of the central thickness of the first lens 11 to the central thickness of the second lens 12.

The ratio f 1234/f=1.60 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

The focal length f2= -13.17 of the second lens 12, the radius of curvature r21= 9.753 of the object-side surface of the second lens 12, the radius of curvature r22= 4.632 of the image-side surface of the second lens 12, the second lens 12 satisfying |f2|/(r21+r22) =0.92.

The focal length f3= -47.50 of the third lens 13, the radius of curvature r31= 10.345 of the object side of the third lens 13, the radius of curvature r32= 7.762 of the image side of the third lens 13, the third lens 13 satisfying |f3|/(r31+r32) =2.62.

Table 9.1 below shows optical parameters of each optical element in a camera module according to a ninth embodiment of the present application.

Table 9.2 shows aspherical coefficients of each lens in a lens assembly according to a ninth embodiment of the present application.

As can be seen from table 9.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 16 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated based on the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 19.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 9.3 below.

Table 9.3 shows optical parameters of a lens assembly according to a ninth embodiment of the present application.

Focal length f/mm	6.67
		F#, f#	1.15
Half image height IMH/mm	6.43
		FOV/degree of field angle	86.20
Optical total length/mm	9.58

As can be seen from table 9.3, the lens assembly 10 provided in the ninth embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 20 is a graph of a modulation transfer function of a camera module according to a ninth embodiment of the present application.

The abscissa in fig. 20 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 20, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Examples ten

Fig. 21 is a schematic diagram of a simulation structure of a camera module according to a tenth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include eight lenses in number, and may include, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 along the optical axis L, as shown in fig. 21.

The fifth lens 15 may have positive optical power, at least a portion of the object side surface of the fifth lens 15 corresponding to the optical axis may be concave, and at least a portion of the image side surface of the fifth lens 15 corresponding to the optical axis may be convex.

The refractive index ind1=1.86 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.864, the central thickness CT2 of the second lens element 12=0.300, and the central thickness CT3 of the third lens element 13=0.300, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.44.

F# =f/epd=1.20 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.47 mm, the half image height IMH of the lens assembly 10=6.43 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.47.

The ratio CT1/CT2 = 3.29 of the center thickness of the first lens 11 to the center thickness of the second lens 12 is CT1 = 0.986.

The ratio f 1234/f=1.46 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

The focal length f2= -12.69 of the second lens 12, the radius of curvature r21= 8.115 of the object-side surface of the second lens 12, the radius of curvature r22= 4.139 of the image-side surface of the second lens 12, the second lens 12 satisfying |f2|/(r21+r22) =1.04.

The focal length f3= -45.24 of the third lens 13, the radius of curvature r31=11.945 of the object-side surface of the third lens 13, the radius of curvature r32= 8.540 of the image-side surface of the third lens 13, and the third lens 13 satisfies |f3|/(r31+r32) =2.21.

Table 10.1 below shows optical parameters of each optical element in a camera module according to the tenth embodiment of the present application.

Table 10.2 shows aspherical coefficients of each lens in a lens assembly according to the tenth embodiment of the present application.

As can be seen from table 10.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 16 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated according to the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 21.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 10.3 below.

Table 10.3 shows optical parameters of a lens assembly according to a tenth embodiment of the present application.

Focal length f/mm	6.60
		F#, f#	1.20
Half image height IMH/mm	6.43
		FOV/degree of field angle	86.94
Optical total length/mm	9.47

As can be seen from table 10.3, the lens assembly 10 according to the tenth embodiment of the present application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 22 is a graph of a modulation transfer function of a camera module according to a tenth embodiment of the present application.

The abscissa in fig. 22 shows different frequencies, the ordinate shows modulation contrast, imaging resolution at different spatial frequencies can be reflected, the solid line in the figure shows a sagittal view field, and the broken line in the figure shows a meridional view field. As can be seen from fig. 22, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example eleven

Fig. 23 is a schematic diagram of a simulation structure of a camera module according to an eleventh embodiment of the present application.

In the present embodiment, the lens assembly 10 may include eight lenses in number, and may include, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 along the optical axis L, as shown in fig. 23.

The refractive index ind1=1.85 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.849, the center thickness CT2 of the second lens element 12=0.300, and the center thickness CT3 of the third lens element 13=0.300, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.42.

F# =f/epd=1.25 for the lens assembly 10.

The optical total length TTL of the lens assembly 10=9.35 mm, the half image height IMH of the lens assembly 10=6.43 mm, and the ratio of the optical total length TTL of the lens assembly 10 to the half image height IMH TTL/imh=1.45.

The central thickness CT1 = 0.916 of the first lens 11, and the ratio CT1/CT2 = 3.05 of the central thickness of the first lens 11 to the central thickness of the second lens 12.

The ratio f 1234/f=1.34 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

The focal length f2= -12.79 of the second lens 12, the radius of curvature r21= 7.545 of the object-side surface of the second lens 12, the radius of curvature r22= 3.980 of the image-side surface of the second lens 12, the second lens 12 satisfying |f2|/(r21+r22) =1.11.

The focal length f3= -38.87 of the third lens 13, the radius of curvature r31= 14.004 of the object side of the third lens 13, the radius of curvature r32= 9.106 of the image side of the third lens 13, the third lens 13 satisfying |f3|/(r31+r32) =1.68.

Table 11.1 below shows optical parameters of each optical element in a camera module according to an eleventh embodiment of the present application.

Table 11.2 shows aspherical coefficients of each lens in a lens assembly according to an eleventh embodiment of the present application.

As shown in table 11.2, each lens in the lens assembly 10 is an aspheric lens, the lens assembly 10 includes 16 aspheric surfaces, and the aspheric surface type Z of each lens in the lens assembly 10 can be calculated by the following aspheric surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated based on the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 23.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 11.3 below.

Table 11.3 shows optical parameters of a lens assembly according to an eleventh embodiment of the present application.

Focal length f/mm	6.55
		F#, f#	1.25
Half image height IMH/mm	6.43
		FOV/degree of field angle	87.51
Optical total length/mm	9.35

As can be seen from table 11.3, the lens assembly 10 provided in the eleventh embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view, a smaller total optical length, and is convenient for implementing the thinning design of the lens assembly 10 and the camera module 101.

Fig. 24 is a graph of a modulation transfer function of a camera module according to an eleventh embodiment of the present application.

Wherein, the abscissa in fig. 24 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 24, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

Example twelve

Fig. 25 is a schematic diagram of a simulation structure of a camera module according to a twelfth embodiment of the present application.

In the present embodiment, the lens assembly 10 may include eight lenses in number, and may include, in order from the object side to the image side, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18 along the optical axis L, as shown in fig. 25.

The refractive index ind1=1.77 of the first lens 11.

The distance between the image side surface of the second lens element 12 and the object side surface of the third lens element 13 on the optical axis, SP 23=0.872, the center thickness CT2 of the second lens element 12=0.300, and the center thickness CT3 of the third lens element 13=0.305, and the second lens element 12 and the third lens element 13 satisfy SP 23/(CT 2+ct 3) =1.44.

F# =f/epd=1.15 for the lens assembly 10.

The central thickness CT1 = 1.230 of the first lens 11, and the ratio CT1/CT2 = 4.10 of the central thickness of the first lens 11 to the central thickness of the second lens 12.

The ratio f 1234/f=1.57 of the effective focal length f1234 of the lens group consisting of the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 to the effective focal length f of the lens assembly 10.

The focal length f2= -18.52 of the second lens 12, the radius of curvature r21= 8.479 of the object-side surface of the second lens 12, the radius of curvature r22= 4.998 of the image-side surface of the second lens 12, the second lens 12 satisfying |f2|/(r21+r22) =1.37.

The focal length f3= -44.92 of the third lens 13, the radius of curvature r31= 9.802 of the object side of the third lens 13, the radius of curvature r32= 7.345 of the image side of the third lens 13, the third lens 13 satisfying |f3|/(r31+r32) =2.62.

Table 12.1 below shows optical parameters of each optical element in a camera module according to the twelfth embodiment of the present application.

Table 12.2 shows aspherical coefficients of each lens in a lens assembly according to a twelfth embodiment of the present application.

As can be seen from table 12.2, each lens in the lens assembly 10 is an aspherical lens, the lens assembly 10 includes 16 aspherical surfaces, and the aspherical surface profile Z of each lens in the lens assembly 10 can be calculated by the following aspherical surface formula:

Where z is the aspherical sagittal height, R is the radial coordinate of the aspherical surface, c is the aspherical apex sphere curvature, c=1/R, R is the radius of curvature, K is the conic coefficient, i is the aspherical coefficient term, i is 30 in this embodiment, ai represents the i-th order aspherical coefficient. Each lens can be simulated based on the obtained aspherical surface profile or the like to finally obtain the camera module 101 shown in fig. 25.

The optical parameters of the lens assembly 10 consisting of the above lenses can be seen in table 12.3 below.

Table 12.3 shows optical parameters of a lens assembly according to a twelfth embodiment of the present application.

Focal length f/mm	6.95
		F#, f#	1.15
Half image height IMH/mm	6.43
		FOV/degree of field angle	84.24
Optical total length/mm	9.58

As can be seen from table 12.3, the lens assembly 10 provided in the twelfth embodiment of the application has the characteristic of an oversized aperture, which is beneficial to improving the imaging quality and effect, and the lens assembly 10 also has a larger angle of view and a smaller total optical length, thereby facilitating the thinning design of the lens assembly 10 and the camera module 101.

The abscissa in fig. 26 represents different frequencies, the ordinate represents modulation contrast, imaging resolution forces of different spatial frequencies can be reflected, the solid line in the figure represents a sagittal view field, and the broken line in the figure represents a meridional view field. As can be seen from fig. 26, the camera module has excellent imaging quality, and can realize high-quality imaging of the large-aperture ultrathin camera module.

In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly coupled, indirectly coupled through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances. The terms "first," "second," "third," "fourth," and the like, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the embodiments of the present application, and are not limited thereto; although embodiments of the present application have been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lens assembly comprising at least a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens having optical power, which are arranged in order from an object side to an image side along an optical axis;

The refractive index ind1 of the first lens satisfies the following formula: ind1 > 1.70;

The lens closest to the image side in the lens assembly has negative focal power, and at least two lenses in the plurality of lenses between the lens closest to the image side and the first lens have positive focal power;

The second lens and the third lens satisfy the conditional expression: 1.3.ltoreq.SP 23/(CT2+CT3). Ltoreq.2, wherein SP23 is the distance between the image side surface of the second lens and the object side surface of the third lens on the optical axis, CT2 is the distance between the object side surface of the second lens and the image side surface of the second lens on the optical axis, and CT3 is the distance between the object side surface of the third lens and the image side surface of the third lens on the optical axis;

The lens assembly satisfies the following conditional expression: f/EPD is less than or equal to 1.3, wherein f is the effective focal length of the lens assembly, and EPD is the entrance pupil diameter of the lens assembly.

2. The lens assembly of claim 1, wherein the lens assembly satisfies the conditional expression: TTL/IMH is less than or equal to 2, wherein TTL is the total optical length of the lens assembly, and IMH is the half image height of the lens assembly.

3. The lens assembly of claim 1 or 2, wherein the lens assembly comprises a number N of lenses having optical power that satisfies: n is more than or equal to 7 and less than or equal to 9, and each lens has optical power.

4. A lens assembly according to claim 3, wherein the lens of the lens assembly closest to the image side is a terminal lens, and the lens adjacent to the terminal lens on the side of the terminal lens facing the object side is a secondary terminal lens;

the first lens and the secondary end lens respectively have positive focal power, and the second lens and the end lens respectively have negative focal power.

5. The lens assembly of claim 4, wherein at least one of the object side and the image side of the end lens includes a inflection point;

At least one of the object side and the image side of the secondary end lens includes a inflection point.

6. The lens assembly of claim 4 or 5, wherein the end lens is the seventh lens, the minor end lens is the sixth lens, and the fifth lens has negative optical power.

7. The lens assembly of claim 6, wherein at least a portion of the object side surface of the first optic corresponding to the optical axis is convex;

at least the part of the image side surface of the second lens corresponding to the optical axis is a concave surface;

at least a part of the image side surface of the fourth lens corresponding to the optical axis is a convex surface;

at least a part of the object side surface of the sixth lens corresponding to the optical axis is a convex surface;

At least a portion of the object side surface of the seventh lens element corresponding to the optical axis is convex, and at least a portion of the image side surface of the seventh lens element corresponding to the optical axis is concave.

8. The lens assembly of claim 7, wherein the first optic satisfies the condition: r11/f1 is more than or equal to 0.6 and less than or equal to 0.85, wherein R11 is the curvature radius of the object side surface of the first lens, and f1 is the focal length of the first lens.

9. The lens assembly of any of claims 6-8, wherein the first lens satisfies the following condition: R12/R11 is more than or equal to 4, wherein R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.

10. The lens assembly of any of claims 6-9, wherein the second lens satisfies the following condition: SAG22/CT2 is less than or equal to 1.8 and less than or equal to 3, wherein SAG22 is the maximum sagittal height of the image side surface of the second lens.

11. The lens assembly of claim 4 or 5, further comprising an eighth lens, the end lens being the eighth lens, the minor end lens being the seventh lens, the sixth lens having negative optical power.

12. The lens assembly of claim 11, wherein at least a portion of the object side surface of the first optic corresponding to the optical axis is convex;

at least the part of the object side surface of the third lens corresponding to the optical axis is a convex surface;

at least a part of the image side surface of the sixth lens corresponding to the optical axis is a concave surface;

at least a part of the object side surface of the seventh lens corresponding to the optical axis is a convex surface;

At least a portion of the object side surface of the eighth lens element corresponding to the optical axis is convex, and at least a portion of the image side surface of the eighth lens element corresponding to the optical axis is concave.

13. The lens assembly of claim 12, wherein the first lens and the second lens satisfy the following conditional expression: CT1/CT2 is less than or equal to 3 and less than or equal to 5, wherein CT1 is the distance between the object side surface of the first lens and the image side surface of the first lens on the optical axis.

14. The lens assembly of any of claims 11-13, wherein the second lens satisfies the following condition: 0.8 & lt|f2 & lt/(R21+R22) & lt 3, wherein f2 is the focal length of the second lens, R21 is the radius of curvature of the object side of the second lens, and R22 is the radius of curvature of the image side of the second lens.

15. The lens assembly of any of claims 11-14, wherein the third lens element satisfies the following condition: 1.2 < f3 > (R31+R32) < 3 >, wherein f3 is the focal length of the third lens, R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens.

16. The lens assembly of any of claims 1-15, wherein the lens assembly satisfies the following conditional expression: 1.ltoreq.f1234/f.ltoreq.2, wherein f1234 is the effective focal length of the lens group consisting of the first lens, the second lens, the third lens and the fourth lens, and f is the effective focal length of the lens assembly.

17. A camera module comprising an image sensor and a lens assembly according to any of the preceding claims 1-16, said image sensor being located on a side of said lens assembly facing said image side.

18. An electronic device comprising a housing and the camera module of claim 17, the camera module being disposed on the housing.