WO2024061220A1

WO2024061220A1 - Optical lens

Info

Publication number: WO2024061220A1
Application number: PCT/CN2023/119744
Authority: WO
Inventors: 凌兵兵; 鲍宇旻
Original assignee: 江西联创电子有限公司
Priority date: 2022-09-22
Filing date: 2023-09-19
Publication date: 2024-03-28
Also published as: CN115236840A; CN115236840B

Abstract

An optical lens, comprising a total of six lens elements, which are sequentially arranged from an object side to an imaging surface along an optical axis: a first lens element (L1) having a negative focal power, an object side surface (S1) and an image side surface (S2) thereof both being concave surfaces; a stop (ST); a second lens element (L2) having a positive focal power, an image side surface (S4) thereof being a convex surface; a third lens element (L3) having a positive focal power, an object side surface (S5) and an image side surface (S6) thereof both being convex surfaces; a fourth lens element (L4) having a focal power; a fifth lens element (L5) having a focal power; and a sixth lens element (L6) having a focal power, an object side surface (S11) thereof being a convex surface, wherein the maximum field of view (FOV) of the optical lens, the real image height (IH) corresponding to the maximum FOV, and the effective working aperture (D1) of the object side surface (S1) of the first lens element (L1) satisfy: D1/IH/tan(FOV/2) < 0.8. The optical lens has the advantages of a large field of view, a large aperture and miniaturization at the same time.

Description

optical lens

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from Chinese application No. 2022111556839, filed on September 22, 2022, the entire content of which is hereby incorporated by reference for all purposes.

Technical Field

The present application relates to the technical field of imaging lenses, and in particular to an optical lens.

Background technique

With the development of automobile intelligence, the driving assistance functions of vehicles are gradually enhanced, among which visual information collection is the core tool. As the level of autonomous driving increases, the requirements for in-vehicle cameras are gradually increasing, especially front-facing cameras. The front-facing camera enhances active safety and driver assistance features such as autonomous emergency braking (AEB), adaptive cruise control (ACC), lane keeping assist system (LKAS) and traffic jam assist (TJA). While meeting the advantages of high resolution, large field of view, and good environmental adaptability, it also has disadvantages such as a large number of lenses and too long total optical length, which is not conducive to the miniaturization of electronic systems.

Application content

In response to the above problems, the purpose of this application is to propose an optical lens that simultaneously has the advantages of a large field of view, a large aperture, and miniaturization.

In order to achieve the above purpose, this application provides an optical lens with a total of six lenses, which are as follows along the optical axis from the object side to the imaging surface:

The first lens with negative optical power has concave surfaces on both the object side and the image side;

aperture;

The second lens with positive optical power has a convex image side surface;

The third lens with positive optical power has convex surfaces on both the object side and the image side;

fourth lens with positive power;

fifth lens with optical power;

The sixth lens with optical power has a convex object side surface;

The maximum field of view FOV of the optical lens, the true image height IH corresponding to the maximum field of view and the effective working aperture D ₁ of the object side of the first lens satisfy: D ₁ /IH/tan(FOV/2)＜ 0.8.

Preferably, the total optical length TTL and effective focal length f of the optical lens satisfy: 4.0<TTL/f<5.0.

Preferably, the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 2.5<TTL/IH.

Preferably, the optical back focus BFL and effective focal length f of the optical lens satisfy: 0.5<BFL/f.

Preferably, the entrance pupil diameter EPD of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 2.5<IH/EPD<3.0.

Preferably, the maximum half angle of view HFOV of the optical lens and the incident angle CRA of the principal ray of the maximum angle of view on the image plane satisfy: 3.0<HFOV/CRA<4.5.

Preferably, the effective focal length f of the optical lens and the combined focal length f ₂₃ of the second lens and the third lens satisfy: 0.9＜f ₂₃ /f＜1.2.

Preferably, the effective focal length f of the optical lens and the combined focal length f ₄₆ of the fourth lens to the sixth lens satisfy: -14.0<f ₄₆ /f<-4.0.

Preferably, the object side curvature radius R ₁ and the image side curvature radius R ₂ of the first lens satisfy: -5.0<R ₁ /R ₂ <-1.2.

Preferably, the sum ΣCT of the total optical length TTL of the optical lens and the center thicknesses of the first lens to the seventh lens along the optical axis satisfies: 0.5<ΣCT/TTL<0.8.

Compared with the existing technology, the beneficial effects of this application are: the optical lens of this application achieves the advantages of large field of view, large aperture and miniaturization by reasonably matching the lens shape and optical power combination between each lens. .

Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

Figure 1 is a schematic structural diagram of an optical lens according to Embodiment 1 of the present application;

Figure 2 is a field curvature curve diagram of the optical lens in Embodiment 1 of the present application;

Figure 3 is a F-tanθ distortion curve of the optical lens in Example 1 of the present application;

Figure 4 is a relative illumination curve diagram of the optical lens in Example 1 of the present application;

Figure 5 is the MTF curve of the optical lens in Example 1 of the present application;

Figure 6 is an axial aberration curve diagram of the optical lens in Example 1 of the present application;

FIG. 7 is a vertical axis chromatic aberration curve diagram of the optical lens in Example 1 of the present application;

Figure 8 is a schematic structural diagram of an optical lens according to Embodiment 2 of the present application;

Figure 9 is a field curvature curve diagram of the optical lens in Embodiment 2 of the present application;

FIG10 is a F-tanθ distortion curve diagram of the optical lens in Example 2 of the present application;

Figure 11 is a relative illumination curve diagram of the optical lens in Example 2 of the present application;

Figure 12 is the MTF curve of the optical lens in Example 2 of the present application;

Figure 13 is a graph of the axial aberration of the optical lens in Example 2 of the present application;

Figure 14 is a vertical axis chromatic aberration curve diagram of the optical lens in Example 2 of the present application;

Figure 15 is a schematic structural diagram of an optical lens according to Embodiment 3 of the present application;

Figure 16 is a field curvature curve diagram of the optical lens in Embodiment 3 of the present application;

FIG17 is a F-tanθ distortion curve diagram of the optical lens in Example 3 of the present application;

Figure 18 is a relative illumination curve diagram of the optical lens in Example 3 of the present application;

Figure 19 is the MTF curve of the optical lens in Example 3 of the present application;

Figure 20 is an axial aberration curve diagram of the optical lens in Example 3 of the present application;

Figure 21 is a vertical axis chromatic aberration curve diagram of the optical lens in Example 3 of the present application;

Figure 22 is a schematic structural diagram of an optical lens according to Embodiment 4 of the present application;

Figure 23 is a field curvature curve diagram of the optical lens in Embodiment 4 of the present application;

Figure 24 is the F-tanθ distortion curve of the optical lens in Example 4 of the present application;

Figure 25 is a relative illumination curve diagram of the optical lens in Example 4 of the present application;

FIG26 is an MTF curve diagram of the optical lens in Example 4 of the present application;

Figure 27 is an axial aberration curve diagram of the optical lens in Example 4 of the present application;

Figure 28 is a vertical axis chromatic aberration curve diagram of the optical lens in Example 4 of the present application;

Figure 29 is a schematic structural diagram of an optical lens according to Embodiment 5 of the present application;

Figure 30 is a field curvature curve diagram of the optical lens in Embodiment 5 of the present application;

Figure 31 is the F-tanθ distortion curve of the optical lens in Example 5 of the present application;

Figure 32 is a relative illumination curve diagram of the optical lens in Example 5 of the present application;

Figure 33 is the MTF curve of the optical lens in Example 5 of the present application;

Figure 34 is a graph of the axial aberration of the optical lens in Example 5 of the present application;

Figure 35 is a vertical axis chromatic aberration curve of the optical lens in Example 5 of the present application.

The following specific embodiments will further describe the present application in conjunction with the above-mentioned drawings.

Detailed ways

For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of embodiments of the present application and do not limit the scope of the present application in any way. Throughout this specification, the same reference numbers refer to the same elements. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the feature. Therefore, the first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.

In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for convenience of illustration. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are examples only and are not strictly to scale.

In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial area; if the lens surface is concave and the concave surface position is not defined, it means that the lens surface is at least in the paraxial area. Concave. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

It should also be understood that the terms "comprises", "including", "having", "includes" and/or "comprising", when used in this specification, indicate the presence of the stated features, elements and/or components, but do not exclude the presence or addition of one or more other features, elements, components and/or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will also be understood that terms (such as those defined in commonly used dictionaries) are to be construed to have a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense, except This document is expressly so qualified.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

The optical lens according to the embodiment of the present application includes in order from the object side to the image side: a first lens, an aperture, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens.

In some embodiments, the first lens may have a negative optical power, which is beneficial to reduce the inclination angle of the incident light, thereby effectively sharing the large field of view on the object side. The object side and image side of the first lens are both concave, which can reduce the effective working aperture of the first lens and prevent the light from diverging too much, resulting in an excessively large aperture of the lens behind the optical lens.

In some embodiments, the second lens may have positive refractive power, which is conducive to condensing light while reducing the deflection angle of light, allowing for a smooth transition of light trends. The image side of the second lens is convex, which is conducive to the emission of light from the edge field of view and transmits as much light as possible to the rear end of the optical lens.

In some embodiments, the third lens may have positive refractive power, which is conducive to condensing light while reducing the deflection angle of light, allowing for a smooth transition of light trends. The object side and image side of the third lens are both convex, which can reduce the coma aberration produced by the third lens itself and improve the imaging quality of the optical lens.

In some embodiments, the object side of the sixth lens is convex, which is beneficial to collecting more incident light and improving the relative illumination of the optical lens, so that the brightness of the optical lens at the image plane is improved to avoid the occurrence of vignetting.

In some embodiments, the fourth lens and the fifth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the decentering sensitivity of the optical lens, balance the aberration of the optical lens, and improve the imaging quality of the optical lens. ; It can also reduce the assembly sensitivity of the optical lens, thereby reducing the difficulty of processing the optical lens and improving the assembly yield of the optical lens.

In some embodiments, an aperture for limiting the light beam may be disposed between the first lens and the second lens, and the aperture may be disposed near the object side of the second lens, which can reduce the generation of optical lens ghosts, and It is helpful to condense the light entering the optical system and reduce the rear port diameter of the optical lens.

In some embodiments, the aperture value FNO of the optical lens satisfies: FNO≤1.64. Meeting the above range is conducive to achieving large aperture characteristics and ensuring clear images in low-light environments or at night.

In some embodiments, the maximum field of view FOV of the optical lens satisfies: 100°＜FOV. Meeting the above range is conducive to achieving wide-angle characteristics, thereby being able to obtain more scene information and meet the needs of large-scale detection.

In some embodiments, the incident angle CRA of the chief ray of the maximum field of view of the optical lens on the image plane satisfies: 10°<CRA<15°. Meeting the above range can make the allowable error value between the CRA of the optical lens and the CRA of the chip photosensitive element larger, improving the adaptability of the optical lens to the image sensor.

In some embodiments, the total optical length TTL and the effective focal length f of the optical lens satisfy: 4.0<TTL/f<5.0. Meeting the above range can effectively limit the length of the lens and achieve miniaturization of the optical lens.

In some embodiments, the total optical length TTL of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 2.5<TTL/IH. Meeting the above range will help shorten the total length of the optical lens while taking into account good imaging quality, and achieve miniaturization of the optical lens.

In some embodiments, the optical back focus BFL and the effective focal length f of the optical lens satisfy: 0.5<BFL/f. Meeting the above range is helpful to achieve a balance between good imaging quality and optical back focus length that is easy to assemble, ensuring the imaging quality of the optical lens while reducing the difficulty of the camera module assembly process.

In some embodiments, the entrance pupil diameter EPD of the optical lens and the real image height IH corresponding to the maximum field of view satisfy: 2.5<IH/EPD<3.0. Meeting the above range can increase the width of the light beam incident on the optical lens, thereby improving the brightness of the optical lens at the image plane and avoiding vignetting.

In some embodiments, the maximum half field angle HFOV of the optical lens and the incident angle CRA of the principal ray of the maximum field angle on the image plane satisfy: 3.0<HFOV/CRA<4.5. Meeting the above range allows the optical lens to achieve a large field of view while incident light can hit the image sensor at an appropriate angle, thereby improving the photosensitive performance of the image sensor and improving the imaging quality of the optical lens.

In some embodiments, the maximum field of view FOV of the optical lens, the true image height IH corresponding to the maximum field of view, and the effective working aperture D ₁ of the object side of the first lens satisfy: D ₁ /IH/tan(FOV/2) <0.8. If the above range is met, the optical lens can have a large field of view and a large image surface while having a small front port diameter, which is conducive to the miniaturization of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f ₁ of the first lens satisfy: -1.5<f ₁ /f<0. If the above range is met, the first lens can have appropriate negative power, which is beneficial to reducing the inclination angle of the incident light, thereby effectively sharing the large object-side field of view.

In some embodiments, the effective focal length f of the optical lens and the focal length f ₂ of the second lens satisfy: 0<f ₂ /f<5.0. If the above range is met, the second lens can have an appropriate positive power, which is conducive to condensing light while reducing the deflection angle of light, allowing a smooth transition of light trends, and improving the imaging quality of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f ₃ of the third lens satisfy: 0<f ₃ /f<3.0. If the above range is met, the third lens can have an appropriate positive power, which is conducive to condensing light while reducing the deflection angle of light, allowing a smooth transition of light trends, and improving the imaging quality of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f ₄ of the fourth lens satisfy: |f ₄ /f|<3.0. Meeting the above range allows the fourth lens to have appropriate optical power, which is beneficial to balancing various aberrations of the optical lens and improving the imaging quality of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f ₅ of the fifth lens satisfy: |f ₅ /f|<2.0. Meeting the above range allows the fifth lens to have appropriate optical power, which is beneficial to balancing various aberrations of the optical lens and improving the imaging quality of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the focal length f ₆ of the sixth lens satisfy: 1.5<|f ₆ /f|. Meeting the above range allows the sixth lens to have appropriate optical power, which is beneficial to balancing various aberrations of the optical lens and improving the imaging quality of the optical lens.

In some embodiments, the effective focal length f of the optical lens and the combined focal length f ₂₃ of the second lens and the third lens satisfy: 0.9<f ₂₃ /f<1.2. Meeting the above range can effectively correct spherical aberration and coma aberration, making the resolution of the wide-angle lens higher; at the same time, it is conducive to converging edge field light and improving the relative illumination of the optical lens. At the same time, it can shorten the total length of the optical lens and A good balance between image quality.

In some embodiments, the effective focal length f of the optical lens and the combined focal length _f46 of the fourth lens to the sixth lens satisfy: -14.0＜ _f46 /f＜-4.0. Meeting the above range can effectively correct various aberrations of the optical system, and in some embodiments, the fourth lens and the fifth lens are glued together with positive and negative optical powers, which can not only correct the aberrations of the fourth lens and the fifth lens, but also correct the chromatic aberration of the optical system, thereby improving the imaging quality of the functional optical lens.

In some embodiments, the object side curvature radius R ₁ and the image side curvature radius R ₂ of the first lens satisfy: -5.0<R ₁ /R ₂ <-1.2. Meeting the above range can effectively reduce the field curvature generated by the first lens itself and improve the imaging quality of the optical lens.

In some embodiments, the sum ΣCT of the total optical length TTL of the optical lens and the central thicknesses of the first to seventh lenses along the optical axis satisfies: 0.5<ΣCT/TTL<0.8. Meeting the above range can effectively compress the total length of the optical lens, and is beneficial to the structural design and production process of the optical lens.

In order to make the system have better optical performance, multiple aspherical lenses are used in the lens. The shape of each aspherical surface of the optical lens satisfies the following equation:

Among them, z is the distance between the surface and the surface vertex in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the surface vertex, K is the quadratic surface coefficient, A, B, C, D, E, F respectively are second-order, fourth-order, sixth-order, eighth-order, tenth-order, and twelfth-order surface coefficients.

The present application will be further described below using multiple embodiments. In various embodiments, the thickness, radius of curvature, and material selection of each lens in the optical lens are different. For specific differences, please refer to the parameter table of each embodiment. The following embodiments are only preferred implementations of the present application, but the implementation of the present application is not limited only by the following examples. Any other changes, substitutions, combinations or simplifications that do not deviate from the innovative points of the present application can be made. All replacement methods should be regarded as equivalent and are included in the protection scope of this application.

Example 1

Please refer to Figure 1, which is a schematic structural diagram of an optical lens provided in Embodiment 1 of the present application. The optical lens includes in order from the object side to the imaging surface along the optical axis: a first lens L1, a diaphragm ST, and a second lens L2. , the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the filter G1.

The first lens L1 has negative refractive power, and its object side S1 and image side S2 are both concave surfaces;

aperture ST;

The second lens L2 has positive refractive power, its object side surface S3 is concave, and its image side surface S4 is convex;

The third lens L3 has positive refractive power, and its object side S5 and image side S6 are both convex surfaces;

The fourth lens L4 has positive refractive power, and its object side S7 and image side S8 are both convex;

The fifth lens L5 has negative refractive power, and its object side S9 and image side S10 are both concave;

The sixth lens L6 has positive refractive power, and its object side S11 and image side S12 are both convex surfaces;

The fourth lens L4 and the fifth lens L5 can be cemented to form a cemented lens;

The object side S13 and the image side S14 of the filter G1 are both flat;

The imaging surface S15 is a flat surface.

The relevant parameters of each lens in the optical lens in Example 1 are shown in Table 1-1.

Table 1-1

The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

Table 1-2

FIG2 shows the field curvature curve of Example 1. It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.06 mm, indicating that the optical lens can correct the field curvature well.

Figure 3 shows the F-tanθ distortion curve of Embodiment 1. It can be seen from the figure that the F-tanθ distortion of the optical lens is controlled within ±40%, indicating that the optical lens can better correct the F-tanθ distortion.

Figure 4 shows the relative illumination curve of Example 1. It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has good relative illumination.

Figure 5 shows the MTF (modulation transfer function) curve of Embodiment 1. It can be seen from the figure that the MTF values of this embodiment are above 0.3 in the entire field of view and in the range of 0 to 160 lp/mm. , the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has better imaging quality and better detail resolution in both low and high frequencies.

Figure 6 shows the axial aberration curve of Example 1. It can be seen from the figure that the deviation of the axial aberration is controlled within ±20 μm, indicating that the optical lens can well correct the axial aberration.

Figure 7 shows the vertical axis chromatic aberration curve of Embodiment 1. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens can effectively correct the chromatic aberration of the edge field of view and Secondary spectrum of the entire image plane.

Example 2

Please refer to Figure 8, which is a schematic structural diagram of an optical lens provided in Embodiment 2 of the present application. The optical lens includes in order from the object side to the imaging surface along the optical axis: a first lens L1, a diaphragm ST, and a second lens L2. , the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the filter G1.

aperture ST;

The second lens L2 has positive refractive power, its object side S3 is a concave surface, and its image side S4 is a convex surface;

The sixth lens L6 has positive refractive power, its object side S11 is a convex surface, and its image side S12 is a concave surface;

The fourth lens L4 and the fifth lens L5 can be cemented to form a cemented lens.

The relevant parameters of each lens in the optical lens in Example 2 are shown in Table 2-1.

table 2-1

The surface parameters of the aspherical lens of the optical lens in Example 2 are shown in Table 2-2.

Table 2-2

Figure 9 shows the field curvature curve of Embodiment 2. It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.04mm, indicating that the optical lens can excellently correct field curvature.

Figure 10 shows the F-tanθ distortion curve of Embodiment 2. It can be seen from the figure that the F-tanθ distortion of the optical lens is controlled within ±40%, indicating that the optical lens can better correct the F-tanθ distortion.

Figure 11 shows the relative illumination curve of Example 2. It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has good relative illumination.

Figure 12 shows the MTF (modulation transfer function) curve of Embodiment 2. It can be seen from the figure that the MTF values of this embodiment are above 0.3 in the entire field of view and in the range of 0 to 160 lp/mm. , the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has better imaging quality and better detail resolution in both low and high frequencies.

FIG. 13 shows the axial aberration curve of Example 2. It can be seen from the figure that the offset of the axial aberration is controlled within ±40 μm, indicating that the optical lens can correct the axial aberration well.

Figure 14 shows the vertical axis chromatic aberration curve of Example 2. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens can effectively correct the chromatic aberration of the edge field of view and Secondary spectrum of the entire image plane.

Example 3

Please refer to Figure 15, which is a schematic structural diagram of an optical lens provided in Embodiment 3 of the present application. The optical lens includes in order along the optical axis from the object side to the imaging surface: a first lens L1, a diaphragm ST, and a second lens L2. , the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the filter G1.

aperture ST;

The fourth lens L4 has negative refractive power, and its object side S7 and image side S8 are both concave;

The fifth lens L5 has positive refractive power, and its object side S9 and image side S10 are both convex surfaces;

The sixth lens L6 has negative refractive power, its object side S11 is a convex surface, and its image side S12 is a concave surface.

The relevant parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

Table 3-1

The surface parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

Table 3-2

Figure 16 shows the field curvature curve of Embodiment 3. It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.06 mm, indicating that the optical lens can well correct the field curvature.

Figure 17 shows the F-tanθ distortion curve of Example 3. It can be seen from the figure that the F-tanθ distortion of the optical lens is controlled within ±40%, indicating that the optical lens can better correct the F-tanθ distortion.

Figure 18 shows the relative illumination curve of Example 3. It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has good relative illumination.

Figure 19 shows the MTF (modulation transfer function) curve of Embodiment 3. It can be seen from the figure that the MTF values of this embodiment are above 0.3 in the entire field of view and in the range of 0 to 160 lp/mm. , the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has better imaging quality and better detail resolution in both low and high frequencies.

Figure 20 shows the axial aberration curve of Example 3. It can be seen from the figure that the deviation of the axial aberration is controlled within ±40 μm, indicating that the optical lens can better correct the axial aberration.

Figure 21 shows the vertical axis chromatic aberration curve of Example 3. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±4 μm, indicating that the optical lens can effectively correct the chromatic aberration of the edge field of view and Secondary spectrum of the entire image plane.

Example 4

Please refer to Figure 22, which is a schematic structural diagram of an optical lens provided in Embodiment 4 of the present application. The optical lens includes in order from the object side to the imaging surface along the optical axis: a first lens L1, an aperture ST, and a second lens L2. , the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the filter G1.

aperture ST;

The second lens L2 has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex surfaces;

The fourth lens L4 has negative refractive power, and its object-side surface S7 and image-side surface S8 are both concave;

The sixth lens L6 has negative refractive power, and its object-side surface S11 is convex, and its image-side surface S12 is concave.

The relevant parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

Table 4-1

The surface parameters of the aspherical lens of the optical lens in Example 4 are shown in Table 4-2.

Table 4-2

Figure 23 shows the field curvature curve of Embodiment 4. It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.11mm, indicating that the optical lens can better correct the field curvature.

Figure 24 shows the F-tanθ distortion curve of Embodiment 4. It can be seen from the figure that the F-tanθ distortion of the optical lens is controlled within ±40%, indicating that the optical lens can better correct the F-tanθ distortion.

FIG. 25 shows the relative illumination curve of Example 4. It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half field of view angle, indicating that the optical lens has good relative illumination.

FIG26 shows the MTF (Modulation Transfer Function) curve of Example 4. It can be seen from the figure that the MTF value of this embodiment is above 0.3 in the entire field of view. In the range of 0 to 160 lp/mm, the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good detail resolution capability in both low-frequency and high-frequency conditions.

Figure 27 shows the axial aberration curve of Example 4. It can be seen from the figure that the deviation of the axial aberration is controlled within ±40 μm, indicating that the optical lens can better correct the axial aberration.

Figure 28 shows the vertical axis chromatic aberration curve of Example 4. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±3 μm, indicating that the optical lens can effectively correct the chromatic aberration of the edge field of view and Secondary spectrum of the entire image plane.

Example 5

Please refer to Figure 29, which is a schematic structural diagram of an optical lens provided in Embodiment 5 of the present application. The optical lens includes in order from the object side to the imaging surface along the optical axis: a first lens L1, an aperture ST, and a second lens L2. , the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the filter G1.

aperture ST;

The second lens L2 has positive refractive power, and its object side S3 and image side S4 are both convex surfaces;

The relevant parameters of each lens in the optical lens in Embodiment 5 are shown in Table 5-1.

Table 5-1

The surface parameters of the aspherical lens of the optical lens in Example 5 are shown in Table 5-2.

Table 5-2

Figure 30 shows the field curvature curve of Embodiment 5. It can be seen from the figure that the field curvature of the meridional image plane and the sagittal image plane is controlled within ±0.11mm, indicating that the optical lens can better correct the field curvature.

Figure 31 shows the F-tanθ distortion curve of Example 6. It can be seen from the figure that the F-tanθ distortion of the optical lens is controlled within ±40%, indicating that the optical lens can better correct the F-tanθ distortion.

Figure 32 shows the relative illumination curve of Example 5. It can be seen from the figure that the relative illumination value of the optical lens is still greater than 70% at the maximum half field angle, indicating that the optical lens has good relative illumination.

Figure 33 shows the MTF (modulation transfer function) curve of Embodiment 5. It can be seen from the figure that the MTF values of this embodiment are above 0.3 in the entire field of view and in the range of 0 to 160 lp/mm. , the MTF curve decreases evenly and smoothly from the center to the edge of the field of view, and has better imaging quality and better detail resolution in both low and high frequencies.

FIG34 shows the axial aberration curve of Example 5. It can be seen from the figure that the offset of the axial aberration is controlled within ±20 μm, indicating that the optical lens can correct the axial aberration well.

[Correction 25.10.2023 under Rule 91]
Figure 35 shows the vertical axis chromatic aberration curve of Example 5. It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±4 μm, indicating that the optical lens can effectively correct the chromatic aberration of the edge field of view and Secondary spectrum of the entire image plane.

Please refer to Table 6, which shows the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value FNO, true image height IH and maximum field of view FOV of the optical lens, as well as the relationship between each embodiment and each embodiment. The numerical value corresponding to the conditional expression.

Table 6

To sum up, the optical lens of the embodiment of the present application realizes the advantages of having a large field of view, a large aperture and being compact at the same time by reasonably matching the lens shape and optical power combination between the lenses.

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

The above-described embodiments only express several implementation modes of the present application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

An optical lens with a total of six lenses, which is characterized in that along the optical axis from the object side to the imaging surface, in order:

The first lens with negative optical power has concave surfaces on both the object side and the image side;

aperture;

The second lens with positive optical power has a convex image side surface;

The third lens with positive optical power has convex surfaces on both the object side and the image side;

a fourth lens with optical power;

a fifth lens having optical power;

The sixth lens with optical power has a convex object side;

The maximum field of view FOV of the optical lens, the true image height IH corresponding to the maximum field of view and the effective working aperture D 1 of the object side of the first lens satisfy: D 1 /IH/tan(FOV/2)＜ 0.8.
The optical lens according to claim 1, wherein the total optical length TTL and the effective focal length f of the optical lens satisfy: 4.0<TTL/f<5.0.
The optical lens according to claim 1, characterized in that the total optical length TTL of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 2.5<TTL/IH.
The optical lens according to claim 1, wherein the optical back focus BFL and the effective focal length f of the optical lens satisfy: 0.5<BFL/f.
The optical lens according to claim 1, characterized in that the entrance pupil diameter EPD of the optical lens and the true image height IH corresponding to the maximum field of view satisfy: 2.5<IH/EPD<3.0.
The optical lens according to claim 1, characterized in that the maximum half angle of view HFOV of the optical lens and the incident angle CRA of the principal ray of the maximum angle of view on the image plane satisfy: 3.0<HFOV/CRA<4.5.
The optical lens according to claim 1, wherein the effective focal length f of the optical lens and the combined focal length f23 of the second lens and the third lens satisfy: 0.9<f 23 /f<1.2.
The optical lens according to claim 1, characterized in that the effective focal length f of the optical lens and the combined focal length f46 of the fourth lens to the sixth lens satisfy: -14.0＜f 46 /f＜-4.0.
The optical lens according to claim 1, wherein the object side curvature radius R1 and the image side curvature radius R2 of the first lens satisfy: -5.0< R1 / R2 <-1.2.
The optical lens according to claim 1, characterized in that the total optical length TTL of the optical lens and the sum ΣCT of the center thicknesses of the first lens to the seventh lens along the optical axis respectively satisfy: 0.5＜ΣCT/TTL＜0.8.