WO2022110641A1 - Wide-angle lens and terminal device - Google Patents

Abstract

A wide-angle lens and a terminal device. The wide-angle lens can be applied to a camera, or applied to a terminal device, such as a mobile phone, a tablet computer or a video camera. The wide-angle lens sequentially comprises from an object side to an image side in an optical axis direction: a first lens group having a negative refractive power, the first lens group comprising at least one lens; a second lens group having a positive refractive power, the second lens group sequentially comprising a first lens, a variable aperture structure and a second lens in the optical axis direction, a surface of the first lens that faces the object side being a convex surface, a surface of the second lens that faces the image side being a convex surface, and the variable aperture structure being used for changing the amount of light entering the wide-angle lens; and a third lens group having a refractive power, the third lens group comprising at least three lenses, and the lens closely adjacent to the image side comprising at least one inflection point. The wide-angle lens satisfies: 0.5 ≤ f2/f ≤ 2, wherein f2 is the focal length of the second lens group, and f is the focal length of the wide-angle lens. In this way, wide-angle imaging can be achieved, and the diameter of an aperture can be adjusted.

Description

A wide-angle lens and terminal equipment

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application filed on November 30, 2020 with the application number 202011379647.1 and titled "A Wide Angle Lens and Terminal Equipment", the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the technical field of optical lenses, and in particular, to a wide-angle lens and a terminal device.

Background technique

The iris can be used in a wide variety of scenes. For example, the iris can be integrated into the lens, and the lens can actively adjust the depth of field, so as to achieve background blur, macro panoramic imaging, or long exposure.

Variable aperture is mainly divided into mechanical blade aperture and electric field control aperture. The mechanical blade aperture can switch the aperture size of the clear light through the rotation of the mechanical blade group. The light-passing area of the mechanical blade aperture is not blocked, and the non-light-clearing area is physically blocked by the mechanical blade. The electric field controlled aperture is filled with a light-shielding material in a closed chamber surrounded by a transparent substrate, and the light-shielding material is driven to change in the clear aperture by electrowetting and electrochromic effect to realize the aperture size switch. When a mechanical blade aperture is set in the lens, the optical performance of the lens will not be affected; however, when an electric field control aperture is set in the lens, the original light beam will be deflected when passing through the aperture, which will affect the optical performance of the original lens . In addition, this layer of electric field control aperture added in the lens also affects the size of the lens. Therefore, the optical parameters of the original lens need to be redesigned.

In the existing lens with integrated electric field controlled aperture, the aperture structure is usually set at the front end of the entire lens, which will limit the field of view of the lens and make it difficult to achieve wide-angle shooting; moreover, the optical parameters of the wide-angle lens with electric field controlled aperture are currently not available. related instructions.

SUMMARY OF THE INVENTION

The present application provides a wide-angle lens and a terminal device, which are used to enable the lens to realize wide-angle shooting and to adjust the aperture of the variable aperture structure.

In a first aspect, the present application provides a wide-angle lens, the wide-angle lens includes a first lens group, a second lens group and a third lens group in sequence along the optical axis direction of the wide-angle lens from the object side to the image side; the first lens group has a negative refractive index The second lens group has a positive refractive power, and the third lens group has a refractive power; the first lens group includes at least one lens, and the second lens group sequentially includes a first lens, a variable aperture structure and a second lens along the direction of the optical axis The lens, the first lens has a convex surface facing the object side, the second lens has a convex surface facing the image side, and the variable aperture structure is used to change the amount of light entering the wide-angle lens; the third lens group includes at least three lenses, which are adjacent to the image side. The lens includes at least one inflection point; the wide-angle lens satisfies the following conditions: 0.5≤f ₂ /f≤2, f ₂ is the focal length of the second lens group, and f is the focal length of the wide-angle lens.

The variable aperture structure refers to an electric field controlled variable aperture structure.

Based on this solution, the wide-angle lens includes a first lens group, a second lens group and a third lens group in sequence along the optical axis direction from the object side to the image side, that is, the second lens group is arranged in the middle of the entire wide-angle lens; on the one hand, there are It helps to expand the light collection ability of the wide-angle lens field of view, thereby realizing wide-angle imaging; on the other hand, it can also improve the symmetry of the entire wide-angle lens, which is conducive to balancing various aberrations. Moreover, through the design of the optical parameters of the wide-angle lens (such as the focal length of the second lens group and the focal length of the wide-angle lens), the wide-angle lens including the variable aperture structure and the wide-angle lens without the variable aperture structure can have the same wide-angle shooting performance.

In a possible implementation manner, the wide-angle lens may also satisfy the following conditions: 0.3≤f ₂₁ /f ₂₂ ≤1.4, where f ₂₁ is the focal length of the first lens, and f ₂₂ is the focal length of the second lens.

By reasonably distributing the optical power of the first lens and the second lens in the second lens group, the curvature of the first lens and the second lens can be reduced under the condition of satisfying the wide-angle field of view, so that when the first lens and the second lens When the lens is fabricated in a variable aperture structure, it helps to reduce the difficulty of fabrication.

Further, optionally, the wide-angle lens may also satisfy any one or more of the following conditions: -4.4≤f ₁ /f≤-1.4, 0.3≤│f _3L /f│≤1.2, 0.6≤TTL/2H≤0.9 , where f ₁ is the focal length of the first lens group, f _3L is the focal length of the lens next to the image side in the third lens group, TTL is the optical length of the wide-angle lens, and H is the half-image height of the wide-angle lens.

Based on the above-mentioned conditions met by the wide-angle lens, the optical length and image height of the wide-angle lens can not be significantly increased under the condition of realizing wide-angle imaging and changing the aperture size, thereby contributing to the miniaturization of the wide-angle lens.

In a possible implementation manner, the thickness of at least one of the first lens and the second lens is not less than 0.5 mm.

By controlling the thickness of the first lens and/or the second lens, the control of the large-angle light in the second lens group can be realized, which helps to reduce the incident angle of the light entering the third lens group, thereby helping to reduce the wide-angle lens aberration.

In a possible implementation manner, the first lens group includes one lens, f _3L /f<0.

By reasonably distributing the optical power, it helps to reduce the weight of aberrations of some lenses (for example, the lenses in the first lens group), thereby reducing the aberrations of the entire wide-angle lens.

In a possible implementation manner, the first lens group includes a lens, and the concave surface of the lens faces the object side.

Based on this wide-angle lens, it is helpful to improve the collection of light with a large field of view, thereby increasing the range of the wide-angle.

In a possible implementation, the first lens group includes two lenses, f _3L /f>0.

By reasonably distributing the optical power, it helps to reduce the weight of aberrations of some lenses (for example, the lenses in the first lens group), thereby reducing the aberrations of the entire wide-angle lens.

In a possible implementation manner, the first lens group includes two lenses, and the convex surfaces of the two lenses included in the first lens group both face the object side.

Based on this wide-angle lens, it is helpful to improve the collection of light with a large field of view, thereby increasing the range of the wide-angle.

In a possible implementation manner, the second lens group further includes a first substrate and a second substrate; the iris structure is fixed between the first substrate and the second substrate, and the first substrate is located between the first lens and the iris Between the structures, the second substrate is located between the variable aperture structure and the second lens.

Based on the wide-angle lens, the first lens and the second lens may not be fabricated on the variable aperture structure, thus helping to reduce the processing difficulty of the aperture structure. Moreover, since the first lens and the second lens do not need to be fabricated on the variable aperture structure, there is no need to constrain the surface shapes of the first lens and the second lens to be flat. Therefore, the first lens and the second lens can be High-deflection lens, which can improve the refractive power, which in turn helps to further increase the wide-angle range.

In a possible implementation manner, the material of the first lens and/or the second lens is plastic or glass.

In a second aspect, the present application provides a terminal device, which may include the wide-angle lens of the first aspect or any one of the first aspect and a processor, where the processor is configured to control the wide-angle lens to acquire images.

For the beneficial effects of the second aspect, reference may be made to the description of the above-mentioned first aspect, which will not be repeated here.

Description of drawings

FIG. 1a is a schematic structural diagram of an inflection point lens provided by the application;

FIG. 1b is a schematic structural diagram of another inflection point lens provided by the application;

2 is a schematic structural diagram of a wide-angle lens provided by the application;

3a is a schematic structural diagram of a first lens group provided by the application;

3b is a schematic structural diagram of another first lens group provided by the application;

3c is a schematic structural diagram of another first lens group provided by the application;

4 is a schematic structural diagram of a second lens group provided by the application;

5 is a schematic structural diagram of another second lens group provided by the application;

6a is a schematic structural diagram of a third lens group provided by the application;

6b is a schematic structural diagram of another third lens group provided by the application;

7 is a schematic structural diagram of another wide-angle lens provided by the application;

Fig. 8 is a kind of longitudinal chromatic aberration schematic diagram that this application provides;

9 is a schematic diagram of field curvature provided by the application;

10 is a schematic diagram of optical distortion provided by the application;

11 is a schematic structural diagram of another wide-angle lens provided by the application;

FIG. 12 is a schematic diagram of longitudinal chromatic aberration provided by the application;

13 is a schematic diagram of field curvature provided by the application;

14 is a schematic diagram of optical distortion provided by the application;

15 is a schematic structural diagram of another wide-angle lens provided by the application;

FIG. 16 is a schematic diagram of longitudinal chromatic aberration provided by the application;

17 is a schematic diagram of field curvature provided by the application;

18 is a schematic diagram of optical distortion provided by the application;

19 is a schematic structural diagram of another wide-angle lens provided by the application;

Fig. 20 is a kind of longitudinal chromatic aberration schematic diagram that this application provides;

21 is a schematic diagram of field curvature provided by the application;

22 is a schematic diagram of optical distortion provided by the application;

23 is a schematic structural diagram of another wide-angle lens provided by the application;

FIG. 24 is a schematic diagram of longitudinal chromatic aberration provided by the application;

25 is a schematic diagram of field curvature provided by the application;

26 is a schematic diagram of optical distortion provided by the application;

27 is a schematic structural diagram of another wide-angle lens provided by the application;

FIG. 28 is a schematic diagram of longitudinal chromatic aberration provided by the application;

Figure 29 is a schematic diagram of field curvature provided by the application;

30 is a schematic diagram of optical distortion provided by the application;

FIG. 31 is a schematic structural diagram of a terminal device provided by this application.

Detailed ways

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Hereinafter, some terms used in this application will be explained. It should be noted that these explanations are for the convenience of those skilled in the art to understand, and do not constitute a limitation on the protection scope required by the present application.

1. Inflection point

The inflection point, also known as the inflection point, refers to the point where the positive and negative curvature of the curve changes, or the curve changes the concavity and convexity.

As shown in FIG. 1a, a schematic structural diagram of a lens provided by the present application. The lens includes a first surface and a second surface, the first surface includes two inflection points, and the second surface also includes two inflection points.

As shown in FIG. 1b, a schematic structural diagram of another lens provided by the present application. The lens includes a first surface and a second surface, the first surface includes two inflection points, and the second surface also includes two inflection points.

2. Inflection force

Refractive power, also known as refractive power, when light is incident from one medium to another medium with different optical densities, the propagation direction of the light is deflected. This phenomenon is called refractive phenomenon. The size is called diopter power, and the unit that expresses diopter power is diopter (Diopter, D). 1D refractive power is equivalent to focusing parallel rays (mainly parallel rays close to the optical axis) at a focal length of 1 meter.

The refractive power of a lens is usually measured in diopter. The stronger the refractive power, the shorter the focal length. For example, a lens with 2D power has a focal length of 1/2m or 50cm. The refractive power of a convex lens is represented by a "+" sign, and the refractive power of a concave lens is represented by a "-".

In the present application, having a negative refractive power means having a negative refractive power, and having a positive refractive power means having a positive refractive power.

3. Aperture

The aperture is used to control the amount of light that passes through the lens and enters the photosensitive surface. The size of the aperture can be represented by F/#, where # is a numerical value. For example, F/1.0, F/1.4, F/2.0, F/2.8, F/4.0, F/5.6, F/8.0, F/11, F/16, F/22, F/32, F/44, F/64 etc. It should be understood that the smaller the value after F, the larger the aperture, the more light entering, and the brighter the picture. The iris is the size of the aperture that changes the amount of light entering the lens.

Based on the above, the present application provides a wide-angle lens, which can not only provide the imaging function of a conventional wide-angle lens with a large field of view, but also realize functions such as background blur or depth of field expansion by adjusting the aperture size of the variable aperture structure. .

The wide-angle lens proposed by the present application will be described in detail below with reference to FIG. 2 to FIG. 30 .

Based on the above content, as shown in FIG. 2 , a schematic structural diagram of a wide-angle lens provided in the present application. Along the optical axis direction from the object side to the image side of the wide-angle lens, it sequentially includes a first lens group 201 with negative refractive power, a second lens group 202 with positive refractive power, and a third lens group 203 with refractive power; the first lens The group 201 includes at least one lens; the second lens group 202 sequentially includes a first lens 2021, a variable aperture structure 2022 and a second lens 2023 along the direction of the optical axis. The surface of the first lens 2021 toward the object side is convex, and the second lens The surface facing the image side of 2023 is a convex surface, and the variable aperture structure 2022 is used to change the amount of light entering the wide-angle lens; the third lens group 203 includes at least three lenses, and the lens adjacent to the image side includes at least one inflection point; the wide-angle lens satisfies the following conditions: 0.5≤f ₂ /f≤2, f ₂ is the focal length of the second lens group, and f is the focal length of the wide-angle lens. It should be understood that both f ₂ and f are optical parameters of a wide-angle lens.

Based on the above-mentioned wide-angle lens, the variable aperture structure and its front and rear lenses (ie, the first lens and the second lens) are used as the second lens group, and are arranged at the position close to the middle of the entire wide-angle lens. In this way, it not only expands the wide-angle lens’s ability to collect light with a large viewing angle, but also Achieving wide-angle imaging can also improve the symmetry of the entire wide-angle lens, which is conducive to balancing various aberrations, especially the reduction of distortion, thereby ensuring the optical performance of the entire wide-angle lens. Moreover, through the design of the optical parameters of the wide-angle lens (such as the focal length of the second lens group and the focal length of the wide-angle lens), the wide-angle lens including the variable aperture structure and the wide-angle lens not including the variable aperture structure can have the same wide-angle shooting optical performance. That is to say, based on the wide-angle lens, not only the imaging function of a conventional wide-angle lens with a large field of view can be provided, but also functions such as background blur or depth of field expansion can be realized by adjusting the aperture size of the variable aperture structure.

Further, the second lens group can be arranged at the original air gap of the wide-angle lens by utilizing the air gap in the middle of the wide-angle lens. In this way, the optical length of the wide-angle lens can not be significantly increased, thereby contributing to the miniaturization of the wide-angle lens.

Each lens group shown in FIG. 2 will be introduced and described below to give an exemplary specific implementation solution. In the following introduction, the conditions satisfied by the wide-angle lens can also be understood as the relationship satisfied by the optical parameters of the wide-angle lens.

1. The first lens group 201

In one possible implementation, the first lens group 201 with negative refractive power may include at least one lens. It can also be understood that the first lens group 201 with negative refractive power may include one lens, or two lenses, or more than two lenses. The first lens group having a negative refractive power can collect light rays with a large angle of view, thereby contributing to an increase in the range of a wide angle.

Please refer to FIG. 3 a , which is a schematic structural diagram of a first lens group provided by the present application. The first lens group 201 may include a lens with negative refractive power, and the concave surface of the lens faces the object side, that is, the surface facing the object side is concave. It can also be understood that the lens includes at least one concave surface.

Please refer to FIG. 3b , which is a schematic structural diagram of another first lens group provided by the present application. The first lens group 201 may include two lenses, the first lens group composed of the two lenses has negative refractive power, and the convex surfaces of the two lenses are both facing the object side, that is, the surfaces facing the object side of the two lenses are both Convex. Orienting the convex surfaces of the lenses in the first lens group toward the object side helps to further increase the wide-angle range.

Please refer to FIG. 3c , which is a schematic structural diagram of another first lens group provided by the present application. The first lens group 201 may include a lens, the concave surface of the lens faces the object side, that is, the surface facing the object side is concave, and the lens may further include four inflection points. Aberration correction of the wide-angle lens is facilitated by the first lens group composed of lenses including the inflection point.

2. The second lens group 202

In a possible implementation manner, the second lens group 202 sequentially includes a first lens 2021, a variable aperture structure 2022 and a second lens 2023 in the direction of the optical axis, and the surface of the first lens 2021 facing the object side is a convex surface, The surface of the second lens 2023 facing the image side is also convex. Further, optionally, the wide-angle lens may also satisfy the following conditions: 0.3≦f ₂₁ /f ₂₂ ≦1.4, f ₂₁ is the focal length of the first lens, and f ₂₂ is the focal length of the second lens.

Further, optionally, the variable aperture structure can realize the size switching of the aperture through electronic control, so that functions such as background blur or depth of field expansion can be realized.

In a possible implementation manner, the variable aperture structure refers to an electric field controlled variable aperture structure. Exemplarily, the variable aperture structure may be, for example, an electric field controlled aperture structure based on electrowetting effect. The electric field controlled aperture structure based on the electrowetting effect is usually a structure formed by filling a closed chamber formed by a pair of glass substrates with two immiscible liquids, wherein one of the two immiscible liquids is It is a transparent polar liquid, such as transparent water, and the other is an opaque non-polar liquid, such as black ink. A driving electrode, a dielectric layer, and a hydrophobic layer are sequentially formed on one glass substrate, and only an electrode layer may be formed on the other glass substrate. When no voltage is applied to the two electrodes, the opaque non-polar liquid spreads, and the light-transmitting aperture is smaller at this time, indicating a small aperture. When a voltage is applied to the two electrodes, the opaque non-polar liquid shrinks, and the aperture of light transmission increases at this time, indicating a large aperture. The magnitude of the voltage applied to the two electrodes is different, and the size of the light transmission aperture is also different, which can represent different aperture sizes, that is, the aperture can be changed. It should be noted that the iris structure in this application can also be an electric field-controlled iris structure based on other effects, such as an electric field-controlled iris structure based on an electrochromic effect. Do limit.

In a possible implementation manner, the material of the first lens may be plastic (or called resin) or glass, and the material of the second lens may also be plastic or glass. Further, optionally, the materials of the first lens and the second lens may be the same material, for example, the materials of the first lens and the second lens may both be plastic; for another example, the materials of the first lens and the second lens may be both for glass. Optionally, the materials of the first lens and the second lens may also be different. For example, the material of the first lens is glass, and the material of the second lens is plastic; for another example, the material of the first lens is plastic, and the material of the second lens is plastic. The material of the lens is glass.

In a possible implementation manner, the thickness of at least one of the first lens and the second lens is not less than 0.5 mm. By controlling the thickness of the first lens and/or the second lens, the control of the large-angle light in the second lens group can be realized, which helps to reduce the incident angle of the light entering the third lens group, thereby helping to reduce the wide-angle lens aberration.

As follows, two possible arrangements of the second lens group are exemplarily shown.

In a first way, both the first lens and the second lens are fabricated on the variable aperture structure. In a possible implementation, one surface of the variable aperture structure 2022 is fixed to one surface of the first lens 2021 , and the other surface of the variable aperture structure 2022 is fixed to one surface of the second lens 2023 , please refer to FIG. 4 . .

Based on the above method 1, the material of at least one of the first lens and the second lens is glass.

In the second way, the variable aperture structure can be fixed by the first substrate and the second substrate.

In a possible implementation manner, the second lens group 202 may further include a first substrate 2024 and a second substrate 2025, the iris structure 2022 is located between the first substrate 2024 and the second substrate 2025, and the first substrate 2024 Located between the first lens 2021 and the variable aperture structure 2022, the second substrate 2025 is located between the variable aperture structure 2022 and the second lens 2023, please refer to FIG. 5 . It should be noted that one surface of the first lens 2021 may be fixed on the first substrate 2024, or may not be fixed on the first substrate 2024; one surface of the second lens 2023 may be fixed on the second substrate 2025, or It may not be fixed on the second substrate 2025.

Based on the above-mentioned method 2, the material of at least one of the first lens and the second lens may be plastic.

3. The third lens group

In a possible implementation manner, the third lens group may include at least three lenses, and at least one surface of the lens adjacent to the image side includes at least one inflection point, which can be described with reference to the aforementioned FIG. 1a or FIG. Repeat.

As shown in FIG. 6a , it is a schematic structural diagram of a third lens group provided by the present application. The third lens group 203 may include four lenses, namely lens 11 , lens 12 , lens 13 and lens 14 . Wherein, each surface of the lens 14 has at least one inflection point.

As shown in FIG. 6b , which is a schematic structural diagram of another third lens group provided by the present application, the third lens 203 may include three lenses, which are a lens 21 , a lens 22 and a lens 23 respectively. Wherein, at least one surface of the lens 23 has at least one inflection point.

It should be noted that the third lens group may also include five lenses, or more than five lenses, which are not listed one by one here. It only needs to satisfy that the third lens group has refractive power, and at least one surface of the last lens in the third lens group includes at least one inflection point.

In a possible implementation manner, if the first lens group includes one lens (as shown in FIG. 3a or 3c above), then f _3L /f<0; if the first lens group includes two lenses (as shown in FIG. 3b) above, then f _3L /f>0.

In this application, the wide-angle lens may also satisfy any one or more of the following conditions: -4.4≤f ₁ /f≤-1.4, 0.3≤│f _3L /f│≤1.2, 0.6≤TTL/2H≤0.9, wherein , f ₁ is the focal length of the first lens group, f _3L is the focal length of the lens next to the image side in the third lens group, TTL is the optical length of the wide-angle lens, H is the half-image height of the wide-angle lens (that is, 2H is the holographic height of the wide-angle lens ). It should be understood that f ₁ , f _3L , TTL, and H are also optical parameters of the wide-angle lens.

In this application, the lenses in any of the first lens group, the second lens group, or the third lens group may all use even-order aspherical lenses, wherein the aspherical coefficient satisfies the following formula 1.

Among them, c is the curvature corresponding to the radius at the vertex of the aspheric surface, r is the distance from any point on the aspheric surface to the optical axis, k is the conic coefficient of the quadric surface, α ₂ , α ₃ , α ₄ , α ₅ , α ₆ , α ₇ , α ₈ is the high-order polynomial aspheric coefficient, Z is the height of the distance vector from the aspheric vertex when the aspheric surface is at a position of height r along the optical axis direction.

Based on the above content, and in combination with the specific optical structure, six specific implementation manners of the above-mentioned wide-angle lens are given below. In order to further understand the structure of the above-mentioned wide-angle lens.

In the following introduction, for different wide-angle lenses, each surface (surface), surface description (comment), surface radius (radius), thickness (thickness), refractive index (index), dispersion of each lens in the wide-angle lens are given respectively. coefficient (abbe number), material (material). Surface description (comment) includes object surface (object), lens aspheric surface (asphere), substrate (substrate), infrared filter surface (IR cut filter) and imaging surface (image); material (material) includes the first lens group, The material of the second lens group and the third lens group can be, for example, glass or plastic, and the material also includes the material of the aperture structure including: Indium tin oxide ITO), dielectric layer, hydrophobic layer, hydrophilic layer, ink layer, polar liquid layer, etc.

Further, optionally, for the lens aspheres in different wide-angle lenses, the aspheric coefficients and quadratic conic coefficients of the relevant surfaces of the respective lenses are respectively given.

In the following introduction, the reference wavelengths used for different wide-angle lens designs and simulating longitudinal chromatic aberration, field curvature and optical distortion are the same, which are 470nm, 510nm, 555nm, 610nm and 650nm, with 555nm as the main reference wavelength. It should be understood that the reference wavelength can also be 486.1 nm, 587.5 nm, 656.2 nm, and 587.5 nm is the main reference wavelength; this application does not limit this.

As shown in FIG. 7 , it is a schematic structural diagram of a wide-angle lens provided by the present application. The wide-angle lens 700 may include a first lens group 701 , a second lens group 702 and a third lens group 703 . The first lens group 701 has a negative refractive power, the second lens group 702 has a positive refractive power, and the third lens group 703 has a refractive power. The first lens group 701 may include a lens, and the surface of the lens toward the object side is a concave surface. Please refer to the above-mentioned description of the first lens group in FIG. 3 a , which will not be repeated here. The second lens group 702 may include a first lens, a variable aperture structure, and a second lens. The first lens and the second lens may be fabricated on the variable aperture structure. For details, please refer to the above-mentioned method 1, which will not be repeated here. The third lens group may include four lenses. For details, please refer to the description of FIG. 6a, which will not be repeated here.

Based on the wide-angle lens 700, the wide-angle lens 700 can satisfy the following conditions: -4.4≤f ₁ /f≤-1.4, 0.5≤f ₂ /f≤2, 0.3≤│f _3L /f│≤1.2, f _3L /f≤0, 0.6≦TTL/2H≦0.9 and 0.3≦f ₂₁ /f ₂₂ ≦1.4. where f ₁ is the focal length of the first lens group, f ₂ is the focal length of the second lens group, f is the focal length of the wide-angle lens, f _3L is the focal length of the lens next to the image side in the third lens group, and TTL is the optical length of the wide-angle lens , H is the half image height of the wide-angle lens, f ₂₁ is the focal length of the first lens, and f ₂₂ is the focal length of the second lens.

Based on the wide-angle lens 700 described above, the surface description, curved surface radius, thickness (including lens thickness, air gap), refractive index and dispersion coefficient of each lens in each lens group can be found in Table 1 below. In Table 1, each surface (surface) is described, the first surface is the object surface (object), the 2-4 surface, the 13-21 surface is the lens asphere (asphere), and the 22nd surface is the infrared filter surface ( IR cut filter) and the 24th surface is the imaging surface (image). The aspheric coefficients and quadratic conic coefficients of the respective lens-related surfaces in each lens group can be found in Table 2 below.

Table 1 Surface description, surface radius, thickness, refractive index, dispersion coefficient and material of each lens

Table 2 Aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens

surface	k	α2	α3	α4	α5	α6	α7	α8
2	1.3969E+01	-2.1957E-03	2.7418E-03	-1.1064E-03	6.6493E-04	-3.1375E-04	8.4750E-05	-8.9506E-06
3	-9.2747E+01	1.5862E-03	1.9330E-02	-2.9964E-02	2.9017E-02	-1.5298E-02	4.1609E-03	-4.2857E-04
4	-1.1865E+00	-2.3921E-03	1.4465E-03	-2.0249E-03	-4.7047E-04	1.7364E-04	5.4250E-04	-1.9399E-04
12	0.0000E+00	0.0000E+00	0.0000E+00	0.0000E+00	0.0000E+00	0.0000E+00	0.0000E+00	0.0000E+00
13	-2.0661E+00	4.7449E-03	-4.6395E-03	-1.3469E-04	1.0864E-03	-4.7682E-04	1.8669E-04	-1.5750E-04
14	-2.9663E+00	-6.3607E-02	6.8526E-02	-6.4294E-02	3.6214E-02	-1.2395E-02	2.3258E-03	-2.1572E-04
15	-1.9873E+00	-7.8265E-02	7.4419E-02	-5.2712E-02	2.3474E-02	-6.3334E-03	9.2005E-04	-6.6243E-05
16	9.4428E+00	-6.4037E-03	4.3850E-03	-3.3472E-03	2.8372E-03	-8.0051E-04	2.0168E-04	-2.6824E-05

17	-1.0704E+00	2.5663E-02	6.9071E-03	-1.0347E-02	3.4905E-03	-6.7173E-04	7.5524E-05	7.6572E-06
18	8.1347E-01	-5.3936E-02	6.9653E-02	-3.3453E-02	8.4436E-03	-1.7234E-03	2.5726E-04	-1.4652E-05
19	-1.8246E+01	-6.8880E-02	6.5393E-02	-3.4887E-02	1.0223E-02	-1.6813E-03	1.4842E-04	-5.5385E-06
20	-3.1760E+00	-3.3240E-03	9.0395E-04	-9.6608E-03	5.5743E-03	-1.2767E-03	1.3381E-04	-5.3486E-06
twenty one	-9.4566E+00	-2.2866E-02	3.0755E-03	-2.5551E-04	-4.1744E-06	-1.6647E-06	5.8929E-07	-3.4888E-08

Below, the optical parameters of the wide-angle lens 700 are exemplarily given. The field of view (FOV) of the wide-angle lens 700 is 102 degrees, the f(EFFL) is 3.55mm, and the maximum F# of the variable aperture structure is F1.83. The holographic height 2H is 8.7mm, and the optical length TTL is 6.72mm. Based on the conditions satisfied by the wide-angle lens 700 and the above Table 1 and Table 2, it can be determined that f ₁ /f is -2.45, f ₂ /f is 0.74, f _3L /f is -0.57, TTL/2H=6.72/8.7=0.77, The thickness4 of the first lens is 0.6, and the thickness12 of the second lens is 0.6. It can also be understood that the optical parameters of the wide-angle lens 700 are shown in Table 3.

Table 3 Optical parameters of wide-angle lens

FOV	102.00
f(EFFL)	3.55
F#	1.83
TTL	6.72
2H	8.70
f 1 /f	-2.45
f 2 /f	0.74
f 3L /f	-0.57
TTL/2H	0.77
f 21 /f 22	1.11
thickness4	0.60
thickness12	0.60

As shown in FIG. 8 , a schematic diagram of a longitudinal chromatic aberration (or referred to as a vertical chromatic aberration) is provided for this application. The longitudinal chromatic aberration is obtained by simulation based on the structure of the wide-angle lens 700 and Table 1 and Table 2 above. It can be determined from FIG. 8 that the longitudinal chromatic aberration is small, indicating that the chromatic aberration imaged by the wide-angle lens 700 can be easily corrected. Therefore, the image imaged by the wide-angle lens 700 has a higher degree of color reproduction. It should be understood that the dashed line in Figure 8 represents the diffraction limit.

The field curvature and optical distortion based on the wide-angle lens 700 can be seen in FIG. 9 and FIG. 10, respectively. It can be seen from FIG. 9 that the magnitude of the field curvature is reasonable. Therefore, the aberration based on the wide-angle lens 700 is small, and the aberration can be easily corrected.

It can be seen from Figure 10 that the dotted lines represent the distortion of light with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm in the meridional (Tangential) direction through the wide-angle lens 700 respectively, and the solid lines represent the wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm respectively. The light rays passing through the wide-angle lens 700 are distorted in the Sagittal direction. It can be determined from FIG. 10 that when the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm pass through the wide-angle lens 700, the distortions in the meridional (Tangential) direction and the sagittal (Sagittal) direction are small, indicating that the wide-angle lens 700 has small distortion. , the distortion can also be better corrected, so the image imaged by the wide-angle lens 700 has a higher degree of restoration.

It can be seen from the above content that the chromatic aberration and distortion imaged by the wide-angle lens 700 can be effectively corrected. It can also be understood that the wide-angle lens 700 can not only realize imaging with a large field of view, but also realize background blur or depth of field extension, and also has high imaging quality.

As shown in FIG. 11 , it is a schematic structural diagram of another wide-angle lens provided by the present application. The wide-angle lens 1100 may include a first lens group 1101 , a second lens group 1102 and a third lens group 1103 . The first lens group 1101 has a negative refractive power, the second lens group 1102 has a positive refractive power, and the third lens group 1103 has a refractive power. The first lens group 1101 may include a lens, and the surface of the lens toward the object side is a concave surface. Please refer to the above-mentioned description of the first lens group in FIG. 3 a , which will not be repeated here. The second lens group 1102 may include a first lens, a first substrate, an iris structure, a second substrate and a second lens, the iris structure may be fixed by the first substrate and the second substrate, and the structure of the second lens group 1102 For details, refer to the above-mentioned method 2, and details are not repeated here. The third lens group may include four lenses. For details, please refer to the description of FIG. 6a, which will not be repeated here.

Based on the wide-angle lens 1100 described above, the wide-angle lens 1100 can satisfy the following conditions: -4.4≤f ₁ /f≤-1.4, 0.5≤f ₂ /f≤2, 0.3≤│f _3L /f│≤1.2, f _3L /f≤0, 0.6≤TTL/2H≤0.9 and 0.3≤f ₂₁ /f ₂₂ ≤1.4.

Based on the above-mentioned wide-angle lens 1100, the surface description, curved surface radius, thickness (including lens thickness, air gap), refractive index and dispersion coefficient of each lens in each lens group can be found in Table 4 below. In Table 4, for each surface (surface) For illustration, the 1st surface is the object surface, the 2nd-5th surface, the 16th-25th surface is the lens aspheric surface (asphere), the 6th and 14th surfaces are the substrate (substrate), and the 26th surface is the infrared filter surface. (IR cut filter), the 28th surface is the imaging surface (image). The aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens in each lens group can be found in Table 5 below.

Table 4 Surface description, surface radius, thickness, refractive index, dispersion coefficient and material of each lens

Table 5 Aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens

surface	k	α2	α3	α4	α5	α6	α7	α8
2	-2.7118E+01	1.1149E-02	1.7635E-03	-1.4887E-03	4.4162E-04	-1.9379E-04	3.9888E-05	-2.3606E-06
3	-5.2747E+01	1.4525E-02	2.5457E-02	-2.0325E-02	1.3382E-02	-5.8467E-03	1.5438E-03	-1.6922E-04
4	-2.2057E+01	-1.3351E-02	6.6637E-03	-4.3467E-03	3.2509E-03	-1.3601E-03	6.5700E-04	-1.3123E-04
5	0.0000E+00	-3.8570E-02	4.8328E-03	3.4825E-04	3.2156E-04	7.6793E-05	-6.6643E-05	-5.4250E-07
16	0.0000E+00	-5.5960E-03	3.7291E-04	2.8328E-03	-3.3742E-04	-4.4696E-04	-5.6373E-05	-3.1157E-06
17	-3.7312E+00	7.6848E-04	-1.5901E-03	-2.8515E-03	1.6081E-03	-2.9037E-05	-1.7832E-04	-1.0303E-05
18	-1.9397E+00	-4.8610E-02	4.7518E-02	-3.6422E-02	1.7759E-02	-5.4261E-03	9.2919E-04	-6.7931E-05
19	-2.0228E+00	-5.6288E-02	5.0264E-02	-2.9635E-02	1.1140E-02	-2.6647E-03	3.7031E-04	-2.2399E-05
20	-9.9242E+01	-5.6612E-03	-3.7795E-03	1.4230E-03	-7.8225E-05	-8.0169E-05	1.8171E-05	-7.9958E-07
twenty one	-8.2136E-01	2.6333E-02	4.7519E-03	-4.8472E-03	1.5054E-03	-2.6775E-04	1.2928E-05	2.1666E-06
twenty two	-7.6432E-01	-2.0781E-02	3.9881E-02	-1.9469E-02	5.2100E-03	-8.5441E-04	9.0053E-05	-4.7240E-06
twenty three	-6.7245E+00	-7.2768E-02	4.7694E-02	-2.0623E-02	5.2632E-03	-7.4354E-04	5.4999E-05	-1.6958E-06
twenty four	3.4292E+01	-3.4093E-02	7.2870E-03	-6.6859E-03	2.6453E-03	-4.9401E-04	4.5263E-05	-1.6268E-06
25	-6.9651E+00	-1.8302E-02	1.8169E-03	-1.7996E-04	1.7269E-05	-1.5611E-06	7.9500E-08	-1.6857E-09

Below, an optical parameter of the wide-angle lens 1100 is exemplarily given. The field of view (FOV) of the wide-angle lens 1100 is 101 degrees, f(EFFL) is 4.01mm, and the maximum F# of the variable aperture structure is F1. 91, the holographic height 2H is 10mm, and the optical length TTL is 7.25mm. Based on the conditions satisfied by the wide-angle lens 1100 and the above-mentioned Table 4 and Table 5, the optical parameters of the wide-angle lens 1100 can be determined as shown in Table 6.

Table 6 Optical parameters of wide-angle lens

FOV	101.00
f(EFFL)	4.01
F#	1.91
TTL	7.25
2H	10
f 1 /f	-1.52
f 2 /f	0.71
f 3L /f	-0.57
TTL/2H	0.72
f 21 /f 22	0.87
thickness4	0.58
thickness12	0.68

The longitudinal chromatic aberration based on the wide-angle lens 1100 described above is shown in FIG. 12 . The longitudinal chromatic aberration is obtained by simulation based on the structure of the wide-angle lens 1100 and Table 4 and Table 5 above. It can be determined from FIG. 12 that the longitudinal chromatic aberration of the wide-angle lens 1100 is small, indicating that the chromatic aberration imaged by the wide-angle lens 1100 can be well corrected. It should be understood that the dashed line in Figure 12 represents the diffraction limit.

The field curvature and optical distortion based on the wide-angle lens 1100 can be seen in FIG. 13 and FIG. 14, respectively. It can be seen from FIG. 13 that the field curvature is relatively reasonable. Therefore, the aberration based on the wide-angle lens 1100 is small, and the aberration can be easily corrected.

It can be seen from Figure 14 that the dotted lines represent the distortion of light with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm in the meridional (Tangential) direction through the wide-angle lens 1100, respectively, and the solid lines represent the wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm respectively. The light rays passing through the wide-angle lens 1100 are distorted in the Sagittal direction. It can be determined from FIG. 14 that the light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm pass through the wide-angle lens 1100 with less distortion in the meridional (Tangential) direction and the sagittal (Sagittal) direction, respectively. Therefore, the distortion of light passing through the wide-angle lens 1100 can also be corrected well, so that the image imaged by the wide-angle lens 1100 has a higher degree of restoration.

It can be seen from the above content that the chromatic aberration and distortion imaged by the wide-angle lens 1100 can be effectively corrected. It can also be understood that the wide-angle lens 1100 can not only realize imaging with a large field of view, but also realize background blur or depth-of-field expansion, and also has a high wide-angle lens imaging quality.

As shown in FIG. 15 , it is a schematic structural diagram of another wide-angle lens provided by the present application. The wide-angle lens 1500 may include a first lens group 1501 , a second lens group 1502 and a third lens group 1503 . The first lens group 1501 has a negative refractive power, the second lens group 1502 has a positive refractive power, and the third lens group 1503 has a refractive power. The first lens group 1501 may include a lens, and the surface of the lens toward the object side is a concave surface. Please refer to the above-mentioned description of the first lens group in FIG. 3 a , which will not be repeated here. The second lens group 1502 may include a first lens, a first substrate, a variable aperture structure, a second substrate and a second lens, the variable aperture structure is fixed between the first substrate and the second substrate, and the structure of the second lens group For details, please refer to the above method 2. The third lens group 1503 may include three lenses, for details, please refer to the description of FIG. 6b.

Based on the wide-angle lens 1500, the wide-angle lens 1500 can satisfy the following conditions: -4.4≤f ₁ /f≤-1.4, 0.5≤f ₂ /f≤2, 0.3≤│f _3L /f│≤1.2, f _3L /f≤0, 0.6≤TTL/2H≤0.9 and 0.3≤f ₂₁ /f ₂₂ ≤1.4.

Based on the above wide-angle lens 1500, the surface description, curved surface radius, thickness (including lens thickness, air gap), refractive index and dispersion coefficient of each lens in each lens group can be found in Table 7 below. The aspheric coefficients and quadratic conic coefficients of the surface can be found in Table 8 below.

Table 7 Surface description, surface radius, thickness, refractive index, dispersion coefficient and material of each lens

Table 8 Aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens

surface	k	α2	α3	α4	α5	α6	α7	α8
2	-5.3845E+01	3.5626E-03	-2.5248E-04	-2.8603E-05	4.5090E-06	1.2951E-06	1.0410E-07	-3.5721E-08
3	4.2471E+01	4.9387E-03	4.3035E-04	1.5690E-04	8.2785E-06	-6.9713E-06	-1.7995E-06	1.1168E-06
4	-4.6156E+00	1.0681E-03	1.6096E-03	-1.0138E-03	-6.3096E-05	-4.1976E-05	-3.8036E-06	-1.2362E-05
5	-5.1698E+01	-1.1333E-02	-4.6381E-03	2.4578E-04	-6.8562E-05	-1.3035E-04	-5.5943E-05	3.9141E-05
16	-1.0000E+02	-4.5568E-02	-2.7383E-03	-7.9107E-03	-1.9388E-03	7.4641E-04	-2.1373E-04	-1.2019E-03
17	1.1196E+00	5.9072E-04	-3.9597E-03	-1.2037E-03	5.0745E-04	5.8604E-04	1.2666E-05	-2.5895E-04
18	-3.1845E+00	-1.8637E-02	-5.5727E-03	1.2414E-03	-4.1801E-04	-6.9975E-04	-2.0897E-04	4.1007E-05
19	-9.4698E+00	1.1471E-03	-1.1452E-03	-1.5779E-03	-6.2384E-05	1.1028E-05	4.5565E-06	1.2057E-06
20	-1.2561E+01	6.3612E-04	-1.6092E-03	1.5933E-04	-8.0605E-06	1.5970E-07	-2.8411E-06	3.4447E-07
twenty one	-3.9058E+00	-1.0326E-02	3.1972E-04	-4.3224E-05	2.7561E-06	2.5190E-07	1.3021E-07	2.0713E-08
twenty two	-1.1300E+00	-9.8684E-03	-6.1683E-04	1.0954E-04	3.3218E-05	7.0467E-07	-6.1589E-08	-2.4112E-08
twenty three	-3.0166E+01	1.9868E-03	-8.2137E-04	9.0356E-05	-9.0195E-06	4.4637E-07	9.7848E-09	-1.2028E-09

Below, an optical parameter of the wide-angle lens 1500 is exemplarily shown. The field of view (FOV) of the wide-angle lens 1500 is 101 degrees, f(EFFL) is 3.37mm, and the maximum F# of the variable aperture structure is F1. 85, the holographic height 2H is 8.27mm, and the optical length TTL is 7.12mm. Based on the conditions satisfied by the wide-angle lens 1500 and the above-mentioned Tables 7 and 8, the optical parameters of the wide-angle lens 1500 can be determined as shown in Table 9.

Table 9 Optical parameters of wide-angle lens

FOV	101.00
f(EFFL)	3.37
F#	1.85
TTL	7.12
2H	8.27
f 1 /f	-4.33
f 2 /f	0.84
f 3L /f	-0.94
TTL/2H	0.86
f 21 /f 22	1.35

thickness4	0.61
thickness12	0.98

The longitudinal chromatic aberration diagram based on the wide-angle lens 1500 is shown in FIG. 16 . The longitudinal chromatic aberration is obtained by simulation based on the structure of the wide-angle lens 1500 and Tables 7 and 8 above. It can be determined from FIG. 16 that the longitudinal chromatic aberration of the wide-angle lens is small, indicating that the chromatic aberration imaged by the wide-angle lens 1500 can be well corrected. It should be understood that the dashed line in Figure 16 represents the diffraction limit.

The field curvature and optical distortion based on the wide-angle lens 1500 described above can be referred to FIG. 17 and FIG. 18 , respectively. It can be seen from FIG. 17 that the field curvature is relatively reasonable. Therefore, based on the small aberration of the wide-angle lens 1500, the aberration can be easily corrected.

It can be seen from Figure 18 that the light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm pass through the wide-angle lens 1500, respectively, in the meridional (Tangential) direction (dotted line in Figure 18) and the sagittal (Sagittal) direction (Figure 18). The distortion of the solid line) is small, indicating that the distortion of the wide-angle lens 1500 is small, and the distortion can be easily corrected. Therefore, the image imaged by the wide-angle lens 1500 has a high degree of restoration.

It can be seen from the above content that the chromatic aberration and distortion imaged by the wide-angle lens 1500 can be effectively corrected. It can also be understood that the wide-angle lens 1500 can not only realize imaging with a large field of view, but also realize background blur or depth of field extension, and also has high imaging quality.

As shown in FIG. 19 , it is a schematic structural diagram of another wide-angle lens provided by the present application. The wide-angle lens 1900 may include a first lens group 1901 , a second lens group 1902 and a third lens group 1903 . The first lens group 1901 has a negative refractive power, the second lens group 1902 has a positive refractive power, and the third lens group 1903 has a refractive power. The first lens group 1901 may include a lens, and the surface of the lens facing the object side is concave and has an inflection point. Please refer to the related description of the first lens group in FIG. 3c, which will not be repeated here. The second lens group 1902 may include a first lens, a first substrate, a variable aperture structure, a second substrate and a second lens, and the variable aperture structure may be fixed by the first substrate and the second substrate. The structure of the second lens group is specific See method 2 above. The third lens group 1903 may include three lenses, for details, please refer to the description of FIG. 6b.

Based on the wide-angle lens 1900, the wide-angle lens 1900 can satisfy the following conditions: -4.4≤f ₁ /f≤-1.4, 0.5≤f ₂ /f≤2, 0.3≤│f _3L /f│≤1.2, f _3L /f≤0, 0.6≦TTL/2H≦0.9 and 0.3≦f ₂₁ /f ₂₂ ≦1.4.

Based on the wide-angle lens 1900, the surface description, surface radius, thickness (including lens thickness, air gap), refractive index and dispersion coefficient of each lens in each lens group can be found in Table 10 below, and the relevant surface of each lens in each lens group The aspheric coefficients and quadratic conic coefficients can be found in Table 11 below.

Table 10 Surface description, surface radius, thickness, refractive index, dispersion coefficient and material of each lens

Table 11 Aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens

surface	k	α2	α3	α4	α5	α6	α7	α8
2	-8.2314E+01	1.4141E-02	1.3137E-03	-2.0128E-04	5.4701E-05	-1.9231E-05	1.2227E-06	-1.1008E-07
3	-1.0003E+02	1.1445E-02	6.2560E-03	-1.4374E-03	1.4034E-03	-5.6168E-04	7.0725E-05	-4.5562E-06
4	-1.9517E+01	-4.7788E-03	1.0983E-03	-8.4154E-04	4.3785E-04	-1.0743E-04	3.8031E-05	-4.1641E-06
5	0.0000E+00	-1.2093E-02	1.8739E-03	3.2319E-04	1.4617E-04	2.0772E-07	-1.0995E-05	8.3855E-06
16	0.0000E+00	3.7928E-03	-1.6103E-05	-8.0483E-05	-1.8881E-04	3.3901E-05	4.0259E-05	-1.5793E-05
17	-5.7646E+00	-3.5804E-03	-1.2442E-03	-8.9980E-04	7.7821E-05	-6.3304E-05	-2.0918E-05	5.1788E-06
18	-5.2232E+01	-7.6786E-03	-2.7807E-03	2.8854E-04	-1.4192E-05	-1.9365E-05	-3.9203E-06	-5.1930E-07
19	-2.9623E-01	4.7154E-03	1.0789E-03	-1.0690E-03	1.5586E-04	-2.6095E-05	4.1261E-07	4.1090E-07
20	5.8861E+00	-1.1521E-02	9.4034E-03	-4.3752E-03	7.9097E-04	-6.3355E-05	4.4352E-06	-8.3091E-07
twenty one	-1.0542E+01	-3.1366E-02	1.1885E-02	-4.4200E-03	7.3996E-04	-5.7459E-05	2.7459E-06	1.3715E-07
twenty two	1.7840E+01	-4.7035E-02	7.1037E-04	-2.5048E-04	7.8578E-05	5.4403E-06	3.5190E-07	-8.3199E-08
twenty three	-6.5594E+00	-1.9854E-02	2.2818E-03	-2.0143E-04	1.0008E-05	-1.5233E-07	4.3036E-09	-4.7286E-10

The optical parameters of the wide-angle lens are exemplarily shown below. The field of view (FOV) of the wide-angle lens is 101 degrees, the f(EFFL) is 3.84mm, the maximum F# of the variable aperture structure is F1.83, and the full image plane is The height 2H is 9.6mm, and the optical length TTL is 6.70mm. Based on the conditions satisfied by the wide-angle lens 1900 and the above-mentioned Table 10 and Table 11, the optical parameters of the wide-angle lens 1900 can be determined as shown in Table 12.

Table 12 Optical parameters of wide-angle lens

FOV	101.00
f(EFFL)	3.84
F#	1.83
TTL	6.70

2H	9.60
f 1 /f	-1.95
f 2 /f	0.92
f 3L /f	-0.67
TTL/2H	0.70
f 21 /f 22	0.46
thickness4	0.51
thickness12	0.55

The longitudinal chromatic aberration diagram based on the wide-angle lens 1900 is shown in FIG. 20 . It can be determined from FIG. 20 that the longitudinal chromatic aberration of the wide-angle lens 1900 is small, indicating that the chromatic aberration imaged by the wide-angle lens 1900 can be well corrected. It should be understood that the dashed line in Figure 20 represents the diffraction limit.

The field curvature and optical distortion based on the wide-angle lens 1900 can be seen in FIG. 21 and FIG. 22, respectively. It can be seen from FIG. 21 that the magnitude of the field curvature is reasonable. Therefore, the aberration based on the wide-angle lens 700 is small, and the aberration can be easily corrected.

It can be seen from Figure 22 that the light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm pass through the wide-angle lens 1900, respectively, in the meridional (Tangential) direction (dotted line in Figure 22) and the sagittal (Sagittal) direction (Figure 22). Solid line) is less distorted. This shows that the distortion of the wide-angle lens 1900 can also be corrected well, so that the image imaged by the wide-angle lens 1900 has a high degree of restoration.

It can be seen from the above content that the chromatic aberration and distortion imaged by the wide-angle lens 1900 can be effectively corrected. Therefore, the wide-angle lens 1900 has high imaging quality, and the wide-angle lens 1900 can also realize imaging with a large field of view, and can also realize background blur or depth of field extension.

As shown in FIG. 23 , it is a schematic structural diagram of another wide-angle lens provided by the present application. The wide-angle lens 2300 may include a first lens group 2301 , a second lens group 2302 and a third lens group 2303 . The first lens group 2301 has a negative refractive power, the second lens group 2302 has a positive refractive power, and the third lens group 2303 has a refractive power. The first lens group 2301 may include two lenses, and the convex surfaces of the two lenses included in the first lens group both face the object side. Please refer to the related description of the first lens group in FIG. 3b above, which will not be repeated here. The second lens group 2302 may include a first lens, a variable aperture structure, and a second lens. The first lens and the second lens may be fabricated on the variable aperture structure. For details, please refer to the first method above. The third lens group 2303 may include four lenses. For details, please refer to the description of FIG. 6a, which will not be repeated here.

Based on the above wide-angle lens 2300, the wide-angle lens 2300 can satisfy the following conditions: -4.4≤f ₁ /f≤-1.4, 0.5≤f ₂ /f≤2, 0.3≤│f _3L /f│≤1.2, f _3L /f≥0, 0.6≤TTL/2H≤0.9 and 0.3≤f ₂₁ /f ₂₂ ≤1.4.

Based on the above wide-angle lens 2300, the surface description, curved surface radius, thickness (including lens thickness, air gap), refractive index and dispersion coefficient of each lens in each lens group can be found in Table 13 below. The aspheric coefficients and quadratic conic coefficients of the surface can be found in Table 14 below.

Table 13 Surface description, surface radius, thickness, refractive index, dispersion coefficient and material of each lens

Table 14 Aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens

surface	k	α2	α3	α4	α5	α6	α7	α8
2	-1.4541E+00	-5.9759E-02	1.4019E-04	2.6596E-03	2.8743E-04	-5.9554E-05	-2.9502E-05	3.9104E-06
3	-1.3037E+00	9.8146E-02	-2.9125E-03	-2.6653E-02	3.4348E-03	5.5770E-03	1.6789E-03	8.4193E-04
4	2.4263E+00	6.4735E-02	8.2471E-02	1.0796E-02	-2.2129E-02	1.6590E-02	2.9657E-02	1.5768E-02
5	1.2698E+01	1.2858E-01	1.0902E-01	2.5319E-02	6.5106E-02	7.5880E-02	2.0247E-01	-5.7353E-02
6	1.0463E+01	1.9338E-02	-1.1550E-02	-2.6548E-02	-1.3763E-02	3.1724E-04	2.2210E-02	-6.1354E-02
15	8.3814E+00	-1.0554E-01	8.9904E-03	-6.2744E-02	7.3225E-03	-4.2537E-03	-8.3081E-03	8.8481E-03
16	-1.0008E+02	-2.2728E-01	-7.6858E-02	-1.1588E-01	-1.4096E-02	7.3095E-03	-2.3164E-02	-6.7988E-02
17	-1.7402E+01	-1.5673E-01	-4.7381E-02	-3.5833E-03	7.0530E-03	6.8738E-03	3.7128E-05	-4.0394E-03
18	1.0115E+01	-5.9555E-02	2.0092E-02	-1.8603E-03	-2.0401E-03	5.0068E-04	8.2923E-04	-9.5068E-04
19	-1.1869E+00	-1.1543E-01	3.5053E-02	-4.9583E-03	-3.3136E-03	-1.8483E-03	-5.1475E-05	1.0673E-03
20	-1.6540E+02	-1.1063E-01	-6.0017E-03	8.4744E-03	-4.3004E-03	-1.6418E-03	-2.0873E-04	4.0572E-04
twenty one	-1.4378E+01	-7.2213E-02	1.2005E-02	-2.0187E-03	-1.8627E-04	1.3655E-04	-1.4874E-05	1.0484E-07
twenty two	-6.8911E+00	-1.4046E-02	3.3592E-03	-6.0765E-04	2.0548E-05	7.8051E-06	-1.3298E-06	4.8024E-08
twenty three	-1.2437E+01	-8.3185E-03	3.6162E-03	-1.1299E-03	1.8576E-04	-1.7844E-05	9.5460E-07	-2.3241E-08

Below, the optical parameters of the wide-angle lens 2300 are exemplarily shown. The field of view (FOV) of the wide-angle lens 2300 is 130 degrees, the f(EFFL) is 1.99mm, and the maximum F# of the variable aperture structure is F1.91. The holographic height 2H is 8.33mm, and the optical length TTL is 6.79mm. Based on the conditions satisfied by the wide-angle lens 2300, the optical parameters of the wide-angle lens 2300 can be determined as shown in Table 15.

Table 15 Optical parameters of wide-angle lens

FOV	130.00
f(EFFL)	1.99
F#	1.91
TTL	6.79
2H	8.33
f 1 /f	-3.17
f 2 /f	1.69
f 3L /f	0.98
TTL/2H	0.82
f 21 /f 22	0.75
thickness4	0.36
thickness12	0.58

The longitudinal chromatic aberration based on the wide-angle lens 2300 described above is shown in FIG. 24 . The longitudinal chromatic aberration is obtained by simulation based on the structure of the wide-angle lens 2300 and Table 13 and Table 14. It can be determined from FIG. 24 that the longitudinal chromatic aberration of the wide-angle lens 2300 is small, indicating that the chromatic aberration imaged by the wide-angle lens 2300 can be well corrected. It should be understood that the dashed line in Figure 23 represents the diffraction limit.

The field curvature and optical distortion based on the above-mentioned wide-angle lens 2300 can be referred to FIG. 25 and FIG. 26 , respectively. It can be seen from FIG. 25 that the field curvature is relatively reasonable. Therefore, the aberration based on the wide-angle lens 700 is small, and the aberration can be easily corrected.

It can be seen from Figure 26 that the light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm pass through the wide-angle lens 2300 in the meridional (Tangential) direction (dotted line in Figure 26) and the sagittal (Sagittal) direction (solid line in Figure 26), respectively. The distortion of the line) is small, indicating that the distortion of the wide-angle lens 2300 can be better corrected, so that the image imaged by the wide-angle lens 2300 has a high degree of restoration.

It can be seen from the above content that the chromatic aberration and distortion imaged by the wide-angle lens 2300 can be effectively corrected. It can also be understood that the wide-angle lens 1500 can not only realize imaging with a large field of view, but also realize background blur or depth of field extension, and also has high imaging quality.

As shown in FIG. 27 , it is a schematic structural diagram of another wide-angle lens provided by the present application. The wide-angle lens 2700 may include a first lens group 2701 , a second lens group 2702 and a third lens group 2703 . The first lens group 2701 has a negative refractive power, the second lens group 2702 has a positive refractive power, and the third lens group 2703 has a refractive power. The first lens group 2701 may include two lenses, and the convex surfaces of the two lenses included in the first lens group 2701 both face the object side. Please refer to the description of the first lens group in FIG. 3b above, which will not be repeated here. The second lens group 2702 may include a first lens, a first substrate, a variable aperture structure, a second substrate and a second lens, the variable aperture structure may be fixed by the first substrate and the second substrate, and the structure of the second lens group 2702 For details, please refer to the above method 2. The third lens group 2703 may include four lenses. For details, please refer to the description of FIG. 6a, which will not be repeated here.

Based on the wide-angle lens 2700, the wide-angle lens 2700 can satisfy the following conditions: -4.4≤f ₁ /f≤-1.4, 0.5≤f ₂ /f≤2, 0.3≤│f _3L /f│≤1.2, f _3L /f≥0, 0.6≦TTL/2H≦0.9 and 0.3≦f ₂₁ /f ₂₂ ≦1.4.

Based on the above wide-angle lens 2700, the surface description, curved surface radius, thickness (including lens thickness, air gap), refractive index and dispersion coefficient of each lens in each lens group can be found in Table 16 below. The aspheric coefficients and quadratic conic coefficients of the surface can be found in Table 17 below.

Table 16 Surface description, surface radius, thickness, refractive index, dispersion coefficient and material of each lens

Table 17 Aspheric coefficients and quadratic conic coefficients of the relevant surfaces of each lens

surface	k	α2	α3	α4	α5	α6	α7	α8
2	-1.7122E+00	-6.7634E-02	-8.6600E-04	2.5280E-03	2.6507E-04	-6.1744E-05	-2.8986E-05	4.5424E-06
3	-1.5533E+00	6.3443E-02	-1.4362E-02	-3.2298E-02	1.2456E-05	3.4662E-03	3.2960E-04	-1.5705E-04

4	9.8224E-01	1.8016E-02	9.3357E-02	4.8588E-03	-2.7915E-02	8.7109E-03	1.7686E-02	-6.1430E-03
5	1.2285E+01	-1.6294E-03	8.6079E-02	1.3852E-02	-5.2861E-02	-3.5113E-02	1.0323E-01	-4.3455E-02
6	9.5625E+00	-2.4655E-02	-2.4874E-02	-4.8664E-03	2.6538E-03	6.8346E-03	1.7036E-02	-5.7317E-02
7	0.0000E+00	1.1026E-02	3.3044E-02	8.1344E-03	-9.0173E-03	-1.6254E-02	-1.3923E-02	-1.0666E-02
18	0.0000E+00	5.2710E-02	-4.2930E-02	-7.1913E-02	1.1345E-02	9.2964E-02	6.2061E-02	-1.5931E-01
19	1.0426E+01	-9.7890E-02	1.1500E-01	-9.6406E-02	-1.0372E-01	-9.7150E-02	-2.0382E-02	1.1859E-01
20	-1.6530E+01	-2.0266E-01	-1.0147E-01	-1.6437E-01	9.9262E-03	8.2908E-02	-1.8622E-02	-2.8527E-01
twenty one	-5.4771E+00	-1.4394E-01	-8.3679E-02	-1.3671E-02	9.0507E-03	9.6287E-03	9.3363E-04	-8.2323E-03
twenty two	1.0916E+01	-3.8462E-02	3.0757E-02	-5.3492E-03	-6.9038E-03	-1.5625E-03	1.0934E-03	8.2167E-04
twenty three	-1.5413E+00	-1.2916E-01	4.2060E-02	-6.7891E-04	-2.2954E-03	-1.9985E-03	-4.2501E-04	7.9494E-04
twenty four	-3.5385E+00	-6.8148E-02	7.6655E-03	4.1426E-03	-1.9678E-03	3.2108E-04	-2.9851E-05	-1.3762E-06
25	-4.5207E+00	-5.9295E-02	1.6495E-02	-2.1729E-03	-3.2545E-04	1.2689E-04	-1.3267E-05	4.5240E-07
26	-4.1522E+00	-1.7317E-02	4.3531E-03	-9.4137E-04	-2.4476E-05	5.8560E-06	-8.2988E-07	1.4093E-07
27	-1.0673E+01	-7.2861E-03	3.3813E-03	-1.1733E-03	1.9022E-04	-1.7996E-05	9.5241E-07	-2.8380E-08

Below, the optical parameters of the wide-angle lens 2700 are exemplarily shown. The field of view (FOV) of the wide-angle lens 2700 is 130 degrees, the f(EFFL) is 1.97mm, and the maximum F# of the variable aperture structure is F1.89. The holographic height 2H is 8.33mm, and the optical length TTL is 6.84mm. Based on the conditions satisfied by the wide-angle lens 2700 and the above-mentioned Table 16 and Table 17, the optical parameters of the wide-angle lens 2700 can be determined as shown in Table 18.

Table 18 Optical parameters of wide-angle lens

FOV	130.00
f(EFFL)	1.97
F#	1.89
TTL	6.84
2H	8.33
f 1 /f	-3.15
f 2 /f	1.69
f 3L /f	0.73
TTL/2H	0.82
f 21 /f 22	1.00
thickness4	0.19
thickness12	0.51

The longitudinal chromatic aberration based on the wide-angle lens 2700 described above is shown in FIG. 28 . The longitudinal chromatic aberration is obtained by simulation based on the structure of the wide-angle lens 2700 and the optical parameters shown in Table 16 and Table 17. It can be determined from FIG. 28 that the longitudinal chromatic aberration of the wide-angle lens is small, indicating that the chromatic aberration imaged by the wide-angle lens 2700 can be well corrected, so that the image imaged by the wide-angle lens 2700 has a higher degree of color reproduction. It should be understood that the dashed line in Figure 28 represents the diffraction limit.

The field curvature and optical distortion based on the above-mentioned wide-angle lens 2700 can be referred to FIG. 29 and FIG. 30 , respectively. It can be seen from FIG. 29 that the field curvature is relatively reasonable. Therefore, the aberration based on the wide-angle lens 700 is small, and the aberration can be easily corrected.

It can be seen from Figure 30 that the light rays with wavelengths of 470nm, 510nm, 555nm, 610nm and 650nm pass through the wide-angle lens 2700 in the meridional (Tangential) direction (dotted line in Figure 30) and the sagittal (Sagittal) direction (solid line in Figure 30), respectively. The distortion of the line) is small, indicating that the distortion of the wide-angle lens 2700 can be better corrected, so that the image imaged by the wide-angle lens 2700 has a high degree of restoration.

It can be seen from the above content that the chromatic aberration and distortion imaged by the wide-angle lens 2700 can be effectively corrected. It can also be understood that the wide-angle lens 1500 can not only realize imaging with a large field of view, but also realize background blur or depth of field extension, and also has high imaging quality.

Based on the structure and functional principle of the wide-angle lens described above, the present application can also provide a terminal device, the terminal device can include the above-mentioned wide-angle lens and a processor, and the processor can be used to control the wide-angle lens to acquire images. Of course, other devices may also be included, such as memory, wireless communication devices, sensors and touch screens, display screens, and the like.

In one possible implementation, the terminal device may be a personal computer, a server computer, a handheld or laptop device, a mobile device (such as a mobile phone, a mobile phone, a tablet computer, a wearable device (such as a smart watch), a personal digital assistants, media players, etc.), consumer electronics, minicomputers, mainframe computers, film cameras, digital cameras, video cameras, surveillance equipment, telescopes or periscopes, etc.

As shown in FIG. 31 , it is a schematic structural diagram of a terminal device provided by this application. The terminal device 3100 may include a processor 3101, a display screen 3102, a camera 3103 and the like. It should be understood that the hardware structure shown in FIG. 31 is only an example. The terminal device to which the present application applies may have more or fewer components than the terminal device shown in FIG. 31 , may combine two or more components, or may have different component configurations. The various components shown in Figure 31 may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and/or application specific integrated circuits.

The processor 3101 may include one or more processing units. For example, the processor 3101 may include an application processor (application processor, AP), a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a digital signal processor (digital signal processor) processor, DSP), etc. Wherein, different processing units may be independent devices, or may be integrated in one or more processors.

The camera 3103 can be used to capture moving, still images, and the like. In some embodiments, the terminal device may include one or N cameras 3103 , where N is an integer greater than 1. For example, the terminal device may include a wide-angle lens. For the wide-angle lens, reference may be made to the relevant description of any of the foregoing embodiments, and details are not repeated here.

Display screen 3102 may be used to display images, video, and the like. Display screen 3102 may include a display panel. The display panel can use a liquid crystal display 3102 (liquid crystal display, LCD), an organic light-emitting diode (organic light-emitting diode, OLED), an active matrix organic light emitting diode or an active matrix organic light emitting diode (active-matrix organic light emitting diode). light emitting diode, AMOLED), flexible light emitting diode (flex light-emitting diode, FLED), quantum dot light emitting diode (quantum dot light emitting diode, QLED) and so on. In some embodiments, the terminal device may include 1 or H display screens 3102 , where H is a positive integer greater than 1. For example, the terminal device may implement a display function through a GPU, a display screen 3102, an application processor 3101, and the like.

In the various embodiments of the present application, if there is no special description or logical conflict, the terms and/or descriptions between different embodiments are consistent and can be referred to each other, and the technical features in different embodiments are based on their inherent Logical conditions can be combined to form new embodiments.

In this application, "and/or", which describes the association conditions of the associated objects, means that there can be three conditions, for example, A and/or B, can mean: the existence of A alone, the existence of A and B at the same time, the existence of B alone , where A and B can be singular or plural. In this application, "vertical" may not refer to absolute verticality, and certain engineering errors may be allowed. The range of the optical parameters of the wide-angle lens can be allowed to have certain engineering errors.

It can be understood that, various numbers and numbers involved in the present application are only for the convenience of description, and are not used to limit the scope of the embodiments of the present application. The size of the sequence numbers of the above processes does not imply the sequence of execution, and the execution sequence of each process should be determined by its function and internal logic. The terms "first", "second", "third", "eleventh", "twelfth", etc. are used to distinguish between similar objects and are not necessarily used to describe a particular order or sequence. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, eg, comprising a series of steps or elements. A method, system, product or device is not necessarily limited to those steps or units expressly listed, but may include other steps or units not expressly listed or inherent to the process, method, product or device.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, the present specification and drawings are merely illustrative of the aspects defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (11)

1. A wide-angle lens, characterized in that, along the optical axis direction from the object side to the image side of the wide-angle lens, it sequentially includes: a first lens group, a second lens group, and a third lens group;

   The first lens group has negative refractive power, and the first lens group includes at least one lens;

   The second lens group has a positive refractive power, and the second lens group sequentially includes a first lens, a variable aperture structure and a second lens along the direction of the optical axis, and the first lens faces the object side. The surface is convex, the surface of the second lens toward the image side is convex, and the variable aperture structure is used to change the amount of light entering the wide-angle lens;

   The third lens group has refractive power, the third lens group includes at least three lenses, and the lens adjacent to the image side includes at least one inflection point;

   The wide-angle lens satisfies the following conditions:

   0.5≤f2/f≤2;

   Wherein, f2 is the focal length of the second lens group, and f is the focal length of the wide-angle lens.
2. The wide-angle lens according to claim 1, wherein the wide-angle lens further satisfies the following conditions: 0.3≤f ₂₁ /f ₂₂ ≤1.4;

   Wherein, f ₂₁ is the focal length of the first lens, and f ₂₂ is the focal length of the second lens.
3. The wide-angle lens according to claim 1 or 2, wherein the wide-angle lens further satisfies any one or more of the following conditions:

   -4.4≤f1/f≤-1.4;

   0.3≤│f3L/f│≤1.2;

   0.6≤TTL/2H≤0.9;

   Wherein, f ₁ is the focal length of the first lens group, f _3L is the focal length of the lens in the third lens group immediately adjacent to the image side, TTL is the optical length of the wide-angle lens, and H is the half of the wide-angle lens. like high.
4. The wide-angle lens according to any one of claims 1 to 3, wherein the thickness of at least one of the first lens and the second lens is not less than 0.5 mm.
5. The wide-angle lens according to any one of claims 1 to 4, wherein the first lens group comprises one lens, and f _3L /f<0.
6. The wide-angle lens according to any one of claims 1 to 5, wherein the first lens group includes a lens, and the concave surface of the lens faces the object side.
7. The wide-angle lens according to any one of claims 1 to 4, wherein the first lens group includes two lenses, f _3L /f>0.
8. The wide-angle lens according to any one of claims 1 to 4 or 6, wherein the first lens group includes two lenses, and the convex surfaces of the two lenses included in the first lens group both face the object side .
9. The wide-angle lens according to any one of claims 1 to 8, wherein the second lens group further comprises a first substrate and a second substrate;

   The variable aperture structure is fixed between the first substrate and the second substrate, the first substrate is located between the first lens and the variable aperture structure, and the second substrate is located at the between the variable aperture structure and the second lens.
10. The wide-angle lens according to any one of claims 1 to 9, wherein the material of the first lens and/or the second lens is plastic or glass.
11. A terminal device, characterized by comprising the wide-angle lens according to any one of claims 1 to 10, and a processor, wherein the processor is configured to control the wide-angle lens to acquire images.

Images