Optical lens
By combining specific optical power and surface shape of six lenses, the problem of high cost and poor imaging effect of forward-looking camera optical lenses is solved, realizing a low-cost, high-resolution, and high-imaging-quality optical lens suitable for advanced driver assistance systems.
Patent Information
- Application Number
- CN202410859437.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-28
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2044-06-28
AI Technical Summary
Existing forward-facing camera optical lenses are expensive and produce poor image quality, making it difficult to meet the needs of advanced driver assistance systems.
Employing a six-lens structure, a combination of specific optical power and surface shape, including lens combinations with negative and positive optical power, the optical power distribution and surface shape of the lens are optimized, and the image quality is improved through the design of apertures and filters.
The cost of the lens was reduced, while the image quality and resolution were improved, resulting in highly efficient imaging and meeting the requirements of advanced driver assistance systems.
Smart Images
Figure CN118818711B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND
[0002] In modern automotive technology, vehicle-mounted cameras play a crucial role. They include various types such as interior, rear, front, side, and surround view cameras, each with its unique application scenarios. For example, rear view cameras are mainly used for reversing images, while surround view cameras provide a 360-degree panoramic view, greatly enhancing the driver's perception.
[0003] Among vehicle-mounted cameras, front view cameras are the core components of ADAS (Advanced Driver Assistance Systems), which are usually installed on the front windshield and are mainly responsible for functions such as forward collision warning, lane departure warning, and pedestrian detection. Currently, front view cameras are usually much more expensive than other types of cameras due to the involvement of complex algorithms and chip processing, which also reflects the important position of front view cameras in vehicle-mounted camera systems. With the rapid development of advanced driver assistance systems, the requirements for front view lenses are becoming higher and higher. Therefore, it is necessary to develop an optical lens with good imaging effect. SUMMARY
[0004] To solve the above problems, the present application aims to provide an optical lens with excellent imaging quality.
[0005] The technical solution adopted by the present application is:
[0006] An optical lens, a total of six lenses, including in order along the optical axis from the object side to the imaging surface:
[0007] The first lens with negative focal power, the object side is convex, and the image side is concave;
[0008] The second lens with positive focal power, the image side is convex;
[0009] The third lens with positive focal power, the object side is concave, and the image side is convex;
[0010] The fourth lens with negative focal power, both the object side and the image side are concave;
[0011] The fifth lens with positive focal power, the object side is convex;
[0012] The sixth lens with negative focal power, the image side is concave;
[0013] The real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian θ of the maximum half field angle of the optical lens satisfy: 1.0 < (IH / 2) / (f x θ) < 1.1.
[0014] Further preferably, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -4.5 < f6 / f < -1.6.
[0015] Further preferably, the optical lens according to claim 1, wherein the radius of curvature R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 7.2 < R1 / f < 9.5; and the radius of curvature R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.8 < R2 / f < 1.5.
[0016] Further preferably, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 5.8 < R1 / R2 < 9.1.
[0017] Further preferably, the radius of curvature R1 of the object side surface of the first lens and the focal length f1 of the first lens satisfy: -4.8 < R1 / f1 < -2.9; and the radius of curvature R2 of the image side surface of the first lens and the focal length f1 of the first lens satisfy: -0.8 < R2 / f1 < -0.2.
[0018] Further preferably, the radius of curvature R5 of the object side surface of the third lens and the focal length f3 of the third lens satisfy: -4.1 < R5 / f3 < -1.8; and the radius of curvature R6 of the image side surface of the third lens and the focal length f3 of the third lens satisfy: -0.8 < R6 / f3 < -0.2.
[0019] Further preferably, the radius of curvature R7 of the object side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: 3.2 < R7 / f4 < 11.8; and the radius of curvature R8 of the image side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: -1.3 < R8 / f4 < -0.5.
[0020] Further preferably, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.1 < (R1-R2) / (R1+R2) < 0.9.
[0021] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.7 < IH / EPD < 2.7.
[0022] Further preferably, the first lens material side surface light passing half radius d1 and the first lens material side surface light passing half radius sag1 satisfy: 0 < sag1 / d1 < 0.2; the first lens image side surface light passing half radius d2 and the first lens image side surface light passing half radius sag2 satisfy: 0.1 < sag2 / d2 < 0.6.
[0023] The optical lens provided by the application adopts six lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of low cost, high resolution, high imaging quality, etc. BRIEF DESCRIPTION OF DRAWINGS
[0024] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:
[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens according to an embodiment of the present application.
[0026] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.
[0027] Figure 3 FIG. 3 is an F-θ distortion curve diagram of the optical lens according to the embodiment of the present application.
[0028] Figure 4 FIG. 4 is an axial aberration curve diagram of the optical lens according to the embodiment of the present application.
[0029] Figure 5 FIG. 5 is a transverse chromatic aberration curve diagram of the optical lens according to the embodiment of the present application.
[0030] Figure 6 FIG. 6 is an MTF curve diagram of the optical lens according to the embodiment of the present application.
[0031] Figure 7 FIG. 7 is a structural schematic diagram of an optical lens according to another embodiment of the present application.
[0032] Figure 8 FIG. 8 is a field curvature curve diagram of the optical lens according to the embodiment of the present application.
[0033] Figure 9 FIG. 9 is an F-θ distortion curve diagram of the optical lens according to the embodiment of the present application.
[0034] Figure 10 FIG. 10 is an axial aberration curve diagram of the optical lens according to the embodiment of the present application.
[0035] Figure 11 FIG. 11 is a transverse chromatic aberration curve diagram of the optical lens according to the embodiment of the present application.
[0036] Figure 12 The MTF curve diagram of the optical lens in Embodiment 2 of the present application.
[0037] Figure 13 The structural schematic diagram of the optical lens in Embodiment 3 of the present application.
[0038] Figure 14 The field curvature curve diagram of the optical lens in Embodiment 3 of the present application.
[0039] Figure 15 The F-θ distortion curve diagram of the optical lens in Embodiment 3 of the present application.
[0040] Figure 16 The axial aberration curve diagram of the optical lens in Embodiment 3 of the present application.
[0041] Figure 17 The lateral chromatic aberration curve diagram of the optical lens in Embodiment 3 of the present application.
[0042] Figure 18 The MTF curve diagram of the optical lens in Embodiment 3 of the present application.
[0043] Figure 19 The structural schematic diagram of the optical lens in Embodiment 4 of the present application.
[0044] Figure 20 The field curvature curve diagram of the optical lens in Embodiment 4 of the present application.
[0045] Figure 21 The F-θ distortion curve diagram of the optical lens in Embodiment 4 of the present application.
[0046] Figure 22 The axial aberration curve diagram of the optical lens in Embodiment 4 of the present application.
[0047] Figure 23 The lateral chromatic aberration curve diagram of the optical lens in Embodiment 4 of the present application.
[0048] Figure 24 The MTF curve diagram of the optical lens in Embodiment 4 of the present application.
[0049] Figure 25 The structural schematic diagram of the optical lens in Embodiment 5 of the present application.
[0050] Figure 26 The field curvature curve diagram of the optical lens in Embodiment 5 of the present application.
[0051] Figure 27 The F-θ distortion curve diagram of the optical lens in Embodiment 5 of the present application.
[0052] Figure 28An axial chromatic aberration curve of the optical lens in Embodiment 5 of the present application.
[0053] Figure 29 A transverse chromatic aberration curve of the optical lens in Embodiment 5 of the present application.
[0054] Figure 30 An MTF curve of the optical lens in Embodiment 5 of the present application.
[0055] Figure 31 A structure diagram of an optical lens in Embodiment 6 of the present application.
[0056] Figure 32 A curvature of field curve of the optical lens in Embodiment 6 of the present application.
[0057] Figure 33 An F-theta distortion curve of the optical lens in Embodiment 6 of the present application.
[0058] Figure 34 An axial chromatic aberration curve of the optical lens in Embodiment 6 of the present application.
[0059] Figure 35 A transverse chromatic aberration curve of the optical lens in Embodiment 6 of the present application.
[0060] Figure 36 An MTF curve of the optical lens in Embodiment 6 of the present application.
[0061] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION
[0062] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0063] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.
[0064] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of convenience in explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is 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 merely examples and are not drawn to scale.
[0065] In the present disclosure, near optical axis refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is at least convex at the near optical axis. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is at least concave at the near optical axis. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side surface of the lens.
[0066] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. In addition, when describing the embodiments of the present application, the word "may" means "one or more embodiments of the present application". Furthermore, the word "exemplary" is intended to mean an example or an illustration.
[0067] 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 should also be understood that the terms should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
[0068] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
[0069] The optical lens provided by the embodiments of the present application is composed of six lenses, which are sequentially arranged along the optical axis from the object side to the imaging plane as the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens.
[0070] In some embodiments, the first lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave. The second lens can have a positive focal power, the object side surface of which is convex or concave, and the image side surface of which is convex. The third lens can have a positive focal power, the object side surface of which is concave, and the image side surface of which is convex. The fourth lens can have a negative focal power, both the object side surface and the image side surface of which are concave. The fifth lens can have a positive focal power, the object side surface of which is convex, and the image side surface of which is convex or concave. The sixth lens can have a negative focal power, the object side surface of which is convex or concave, and the image side surface of which is concave.
[0071] In some embodiments, the second lens has positive refractive power, and its object-side surface is concave; the fifth lens has positive refractive power, and its image-side surface is convex; and the sixth lens has negative refractive power, and its object-side surface is convex.
[0072] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the fifth lens has positive refractive power, and its image-side surface is concave; and the sixth lens has negative refractive power, and its object-side surface is convex.
[0073] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the fifth lens has positive refractive power, and its image-side surface is convex; and the sixth lens has negative refractive power, and its object-side surface is concave.
[0074] In some embodiments, the second lens has positive refractive power, and its object-side surface is convex; the fifth lens has positive refractive power, and its image-side surface is convex; and the sixth lens has negative refractive power, and its object-side surface is convex.
[0075] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the second lens and the third lens. It can be understood that the diaphragm can be used to limit the amount of light, so as to change the brightness of the imaging. In addition, when the diaphragm is located between the second lens and the third lens, the diaphragm can reasonably distribute the functions of the first lens to the sixth lens, for example, the first lens and the second lens can be used to receive light to a greater extent, and the third lens to the sixth lens can be used to correct aberrations, which is conducive to balancing the structure of the entire optical system. In addition, when the diaphragm is located between the second lens and the third lens, the correction of the diaphragm aberration is facilitated.
[0076] In some embodiments, the optical lens can further comprise a filter and a protective glass, which can be sequentially arranged along the optical axis between the sixth lens and the imaging surface. The filter is used to filter out interference light, so as to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging. The protective glass plays a role in protecting the optical lens, preventing the photosensitive chip from being damaged, and can improve the impact resistance and scratch resistance of the optical lens, while having little effect on the imaging quality of the optical lens.
[0077] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian θ of the maximum half field angle of the optical lens satisfy: 1.0 < (IH / 2) / (f x θ) < 1.1. Satisfying the above range is conducive to achieving the balance between the large image surface and the high-quality imaging of the optical lens, so that the lens has a larger imaging area, while having higher resolution. Preferably, 1.00 < (IH / 2) / (f x θ) < 1.06.
[0078] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -4.5 < f6 / f < -1.6. Satisfying the above range makes the sixth lens have a proper negative refractive power, increases the imaging area, and improves the imaging quality. Preferably, -4.2 < f6 / f < -2.1.
[0079] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 7.2 < R1 / f < 9.5; and the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.8 < R2 / f < 1.5. Satisfying the above range controls the curvature radius of the object side surface of the first lens and the effective focal length of the optical lens, and the curvature radius of the image side surface of the first lens and the effective focal length of the optical lens to be within a proper range, which reduces the field curvature and the spherical aberration, and helps to achieve high-quality imaging. Preferably, 8.1 < R1 / f < 9.0; and 1.0 < R2 / f < 1.3.
[0080] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 5.8 < R1 / R2 < 9.1. Satisfying the above range controls the curvature radius of the object side surface of the first lens and the curvature radius of the image side surface of the first lens to be within a proper range, which further reduces the field curvature, reduces the difficulty of distortion correction of subsequent lenses, and improves the imaging quality. Preferably, 6.4 < R1 / R2 < 8.3.
[0081] In some embodiments, the curvature radius R1 of the object side surface of the first lens and the focal length f1 of the first lens satisfy: -4.8 < R1 / f1 < -2.9; and the curvature radius R2 of the image side surface of the first lens and the focal length f1 of the first lens satisfy: -0.8 < R2 / f1 < -0.2. Satisfying the above range controls the curvature radius of the object side surface of the first lens and the focal length of the first lens, and the curvature radius of the image side surface of the first lens and the focal length of the first lens to be within a proper range, which further reduces the field curvature and the spherical aberration, and helps to improve the lens resolution. Preferably, -4.5 < R1 / f1 < -3.3; and -0.6 < R2 / f1 < -0.5.
[0082] In some embodiments, the curvature radius R5 of the object side surface of the third lens and the focal length f3 of the third lens satisfy: -4.1 < R5 / f3 < -1.8; and the curvature radius R6 of the image side surface of the third lens and the focal length f3 of the third lens satisfy: -0.8 < R6 / f3 < -0.2. Satisfying the above range controls the curvature radius of the object side surface of the third lens and the focal length of the third lens, and the curvature radius of the image side surface of the third lens and the focal length of the third lens to be within a proper range, which reduces the astigmatism and the coma, and reduces the difficulty of aberration correction of subsequent lenses, and improves the imaging quality. Preferably, -3.9 < R5 / f3 < -2.1; and -0.6 < R6 / f3 < -0.5.
[0083] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: 3.2 < R7 / f4 < 11.8; the radius of curvature R8 of the image side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: -1.3 < R8 / f4 < -0.5. Satisfying the above ranges, the radius of curvature of the object side surface of the fourth lens and the focal length of the fourth lens, and the radius of curvature of the image side surface of the fourth lens and the focal length of the fourth lens are controlled within appropriate ranges, which can reduce the spherical aberration and the astigmatism, and can cooperate with subsequent lenses to reduce the chromatic aberration, thereby improving the imaging quality. Preferably, 3.7 < R7 / f4 < 11.5; -1.1 < R8 / f4 < -0.8.
[0084] In some embodiments, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R2 of the image side surface of the first lens satisfy: 0.1 < (R1-R2) / (R1+R2) < 0.9. Satisfying the above ranges, the radius of curvature of the object side surface of the first lens and the focal length of the first lens, and the radius of curvature of the image side surface of the first lens and the focal length of the first lens are controlled within appropriate ranges, which can further reduce the field curvature and the spherical aberration, and help to improve the resolution of the lens. Preferably, 0.7 < (R1-R2) / (R1+R2) < 0.8.
[0085] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.7 < IH / EPD < 2.7. Satisfying the above ranges, the width of the light bundle entering the optical lens can be increased, so that the brightness of the optical lens at the image plane is improved to avoid the generation of dark corners. Preferably, 2.0 < IH / EPD < 2.5.
[0086] In some embodiments, the half entrance pupil diameter d1 of the object side surface of the first lens and the half entrance pupil sag Sag1 of the object side surface of the first lens satisfy: 0 < Sag1 / d1 < 0.2; the half entrance pupil diameter d2 of the image side surface of the first lens and the half entrance pupil sag Sag2 of the image side surface of the first lens satisfy: 0.1 < Sag2 / d2 < 0.6. Satisfying the above ranges, the half entrance pupil diameter and the corresponding half entrance pupil sag of the object side surface and the image side surface of the first lens are reasonably limited, which can effectively control the light ray trend of the edge field of view and improve the imaging quality of the edge field of view. Preferably, 0 < Sag1 / d1 < 0.1; 0.25 < Sag2 / d2 < 0.50.
[0087] In some embodiments, the total track length TTL of the optical lens and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 3.2 < TTL / IH < 4.5. Satisfying the above range is conducive to achieving a balance between a small volume and a large image surface of the optical lens, so that the lens has a smaller total length while having higher resolution. Preferably, 3.3 < TTL / IH < 4.2.
[0088] In some embodiments, the maximum field of view FOV of the optical lens and the aperture value FNO of the optical lens satisfy: 32° < FOV / FNO < 43°. Satisfying the above range is conducive to expanding the field of view of the optical lens and increasing the aperture of the optical lens, which is conducive to the optical lens to obtain more scene information, meet the needs of large-range detection, and the implementation of large-aperture characteristics is conducive to improving the problem of rapid decline of relative brightness in the edge field of view, thereby also conducive to obtaining more scene information. Preferably, 35.7° < FOV / FNO < 39.5°.
[0089] In some embodiments, the back focal length BFL of the optical lens and the effective focal length f of the optical lens satisfy: BFL / f > 0.35. Satisfying the above range reduces the interference of aberrations such as aberrations and coma, improves the resolution and clarity of imaging, and improves the stability of the optical lens. Preferably, 0.37 < BFL / f < 0.44.
[0090] In some embodiments, the maximum field of view FOV of the optical lens, the effective focal length f of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 50° < FOVxf / IH < 60°. Satisfying the above range reasonably controls the field of view, focal length, and real image height of the optical lens within a reasonable range, which can improve the imaging quality of the lens while meeting the specification requirements. Preferably, 54.6° < FOVxf / IH < 57.3°.
[0091] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -2.6 < f1 / f < -1.6. Satisfying the above range makes the first lens have a suitable negative focal power to realize large-angle light collection, and is also conducive to reducing the inclination angle of incident light and reducing the generation of high-order aberrations. Preferably, -2.5 < f1 / f < -1.9.
[0092] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: 1.1 < f2 / f < 2.7. Satisfying the above range makes the second lens have a suitable positive focal power to converge light, so that the light trend is stable. Preferably, 1.3 < f2 / f < 2.5.
[0093] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.7 < f3 / f < 4.1. Satisfying the above range makes the third lens have a proper positive refractive power, balances the lens aberration, and improves the imaging quality. Preferably, 1.8 < f3 / f < 3.9.
[0094] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: -1.4 < f4 / f < -0.3. Satisfying the above range makes the fourth lens have a proper negative refractive power, optimizes the lens chromatic aberration, and improves the imaging quality. Preferably, -1.2 < f4 / f < -0.5.
[0095] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 0.3 < f5 / f < 1.3. Satisfying the above range makes the fifth lens have a proper positive refractive power, optimizes the spherical aberration, and realizes high-quality imaging. Preferably, 0.6 < f5 / f < 1.0.
[0096] In some embodiments, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: 0.8 < f12 / f < 5.1. Satisfying the above range makes the refractive power of the front lens group of the optical lens be in a proper range, converges light rays, reduces the difficulty of aberration correction of the lens, and improves the imaging quality of the optical lens. Preferably, 1.0 < f12 / f < 4.9.
[0097] In some embodiments, the focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens, and the focal length f6 of the sixth lens satisfy: -2.4 < (f3+f4) / (f5+f6) < -0.2. Satisfying the above range reasonably controls the focal lengths of the third lens, the fourth lens, the fifth lens, and the sixth lens to be in a proper range, reasonably allocates the refractive power proportion of each lens, and improves the structural stability of the optical lens. Preferably, -2.2 < (f3+f4) / (f5+f6) < -0.5.
[0098] In some embodiments, the radius of curvature R9 of the object side surface of the fifth lens and the focal length f5 of the fifth lens satisfy: 0.5 < R9 / f5 < 1.4. Satisfying the above range controls the radius of curvature of the object side surface of the fifth lens and the focal length of the fifth lens to be in a proper range, reduces the difficulty of distortion correction of the subsequent lens, and increases the image size. Preferably, 0.7 < R9 / f5 < 1.2.
[0099] In some embodiments, the first lens object-side surface half-aperture radius d1, the real image height IH corresponding to the maximum field angle of the optical lens, and the maximum field angle FOV of the optical lens satisfy: 1.5 < d1 / (IH / 2) / tan(FOV / 2) < 3.1. Satisfying the above range, the front end radius, the real image height, and the maximum field angle of the optical lens are reasonably limited, which can reasonably arrange the overall geometry of the optical lens and improve the structural stability thereof. Preferably, 1.7 < d1 / (IH / 2) / tan(FOV / 2) < 2.9.
[0100] In some embodiments, the total optical length TTL of the optical lens and the sum ∑CT of the center thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens satisfy: 1.6 < TTL / ∑CT < 3.2. Satisfying the above range, high pixel characteristics can be achieved, and the imaging quality of the optical lens can be improved. Preferably, 1.8 < TTL / ∑CT < 3.0.
[0101] In some embodiments, the center thickness CT2 of the second lens and the center thickness CT3 of the third lens satisfy: 1.4 < CT2 / CT3 < 3.3. Satisfying the above range, the center thicknesses of the first lens and the second lens are reasonably configured, which is conducive to meeting the processability and workability requirements of the lens and improving the stability of the structure and the imaging quality. Preferably, 1.4 < CT2 / CT3 < 3.1.
[0102] In some embodiments, the fourth lens and the fifth lens form a cemented lens group, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented surfaces. Satisfying the above range, the chromatic aberration of the optical lens can be effectively corrected, the decentration sensitivity of the optical lens can be reduced, the aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved; the assembly sensitivity of the optical lens can also be reduced, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.
[0103] In some embodiments, the fourth lens and the fifth lens form a cemented lens group with positive refractive power, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented surfaces. The combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: 3.2 < f45 / f < 168.8.
[0104] In some embodiments, the fourth lens and the fifth lens form a cemented lens group with negative refractive power, and the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented surfaces. The combined focal length f45 of the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: -90.9 < f45 / f < -3.1.
[0105] In some embodiments, the optical lens satisfies the following conditional expressions: 4.9mm < f < 5.9mm; 60° < FOV < 75°; 2.6mm < EPD < 3.2mm; 21mm < TTL < 27mm; 1.6 < FNO < 2.0; 5.5mm < IH < 7.3mm; 18° < CRA < 31°; BFL > 1.9mm. In the above conditional expressions, f represents the effective focal length of the optical lens, FOV represents the maximum field of view angle of the optical lens, EPD represents the entrance pupil diameter of the optical lens, TTL represents the total optical length of the optical lens, FNO represents the aperture value of the optical lens, IH represents the real image height corresponding to the maximum field of view angle of the optical lens, CRA represents the chief ray incident angle at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. Preferably, 5.2mm < f < 5.5mm; 63° < FOV < 72°; 2.8mm < EPD < 3.1mm; 22.8mm < TTL < 26.2mm; 1.7 < FNO < 1.9; 6.1mm < IH < 6.9mm; 22.8° < CRA < 26.2°; 1.9mm < BFL < 2.4mm. When the above ranges are satisfied, the optical lens has at least one or more advantages of large target surface, low cost, high resolution, etc.
[0106] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens can be a spherical lens or an aspherical lens. Compared with the spherical structure, the aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving miniaturization of the lens. More specifically, the first lens, the third lens, the fourth lens and the fifth lens of the present application are spherical lenses, and the second lens and the sixth lens are aspherical lenses.
[0107] In various embodiments of the present application, when the lens is an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:
[0108]
[0109] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance of the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E and F are the fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order surface coefficients, respectively.
[0110] The application will be further described in the following embodiments. In each embodiment, the thickness, the radius of curvature, the material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.
[0111] Embodiment 1
[0112] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, the optical lens 100 includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1 and a protective glass G2.
[0113] The first lens L1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
[0114] The second lens L2 has a positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
[0115] The third lens L3 has a positive focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface;
[0116] The fourth lens L4 has a negative focal power, and the object side surface S7 and the image side surface S8 are both concave surfaces;
[0117] The fifth lens L5 has a positive focal power, and the object side surface S8 and the image side surface S9 are both convex surfaces;
[0118] The fourth lens L4 and the fifth lens L5 form a cemented lens group with a positive focal power, that is, the cemented surface of the image side surface of the fourth lens L4 and the object side surface of the fifth lens L5 is S8;
[0119] The sixth lens L6 has a negative focal power, the object side surface S10 is a convex surface, and the image side surface S11 is a concave surface;
[0120] The object side surface S12 and the image side surface S13 of the filter G1 are both flat surfaces;
[0121] The object side surface S14 and the image side surface S15 of the protective glass G2 are both flat surfaces;
[0122] The imaging surface S16 is a flat surface.
[0123] The first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses, and the second lens L2 and the sixth lens L6 are glass aspherical lenses.
[0124] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.
[0125] Table 1-1
[0126]
[0127] The surface type parameters of the aspherical lenses of the optical lens 100 in Embodiment 1 are shown in Table 1-2.
[0128] Table 1-2
[0129]
[0130]
[0131] In this embodiment, the field curvature curve, the F-θ distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF (Modulation Transfer Function) curve of the optical lens 100 are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 respectively.
[0132] Figure 2 The field curvature curve of Embodiment 1 is shown, which represents the curvature degree of light rays of different wavelengths on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.04mm-0.04mm, which shows that the optical lens can well correct the field curvature.
[0133] Figure 3 The F-θ distortion curve of Embodiment 1 is shown, which represents the F-θ distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the F-θ distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the F-θ distortion of the optical lens is controlled within 0-0.5%, the image compression in the edge angle region is relatively flat, and the clarity of the expanded image is effectively improved.
[0134] Figure 4The axial aberration curve of the embodiment 1 is shown, which represents the aberration of each wavelength on the optical axis at the imaging plane, the horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the shift of the axial aberration is controlled within -0.01mm-0.02mm, which shows that the optical lens can better correct the axial aberration.
[0135] Figure 5 The curve of the axial aberration of the embodiment 1 is shown, which represents the color difference of each wavelength at different image heights on the imaging plane relative to the central wavelength (0.55μm), the horizontal axis represents the axial aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field angle. As can be seen from the figure, the axial aberration of the longest wavelength and the shortest wavelength is controlled within -1.5μm-4μm, which shows that the optical lens can very well correct the color difference of the edge field and the secondary spectrum of the entire image plane.
[0136] Figure 6 The MTF (modulation transfer function) curve of the embodiment 1 is shown, which represents the lens imaging modulation degree of different spatial frequencies under each field of view, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the figure, the MTF value of the embodiment is above 0.35 in the full field of view, and in the range of 0-160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, which has good imaging quality and good detail resolution capability.
[0137] Embodiment 2
[0138] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens 200 provided in the embodiment 2 of the present application. Compared with the embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different; and the object side S3 of the second lens L2 is a convex surface; the image side S9 of the fifth lens L5 is a concave surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group with negative focal power.
[0139] The related parameters of each lens in the optical lens 200 in the embodiment 2 are shown in Table 2-1.
[0140] Table 2-1
[0141]
[0142] The surface type parameters of the aspheric lens of the optical lens 200 in the embodiment 2 are shown in Table 2-2.
[0143] Table 2-2
[0144] Figure 8 K B C D E F S3 -1.04E+00 -5.30E-04 -1.60E-05 7.73E-07 -1.45E-07 7.85E-09 S4 -5.05E+00 -5.91E-05 -2.10E-05 8.83E-06 -1.24E-06 7.78E-08 S10 -4.32E+01 -1.07E-02 -2.52E-04 9.20E-05 -2.31E-05 1.60E-06 S11 -2.50E-01 -9.39E-03 1.59E-04 2.73E-05 -6.01E-06 3.49E-07
[0145] In this embodiment, the field curvature curve, F-θ distortion curve, axial aberration curve, transverse chromatic aberration curve, and MTF (modulation transfer function) curve of the optical lens 200 are respectively as follows: Figure 9 , Figure 10 , Figure 11 , Figure 12 and Figure 8 As shown. From Figure 9 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.03mm to 0.03mm, indicating that the optical lens can effectively correct field curvature. From Figure 10 As can be seen, the F-θ distortion of the optical lens is controlled within 0-5%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From Figure 11 As can be seen, the axial aberration offset in this embodiment is controlled within -0.01mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration. From Figure 12 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 3μm, indicating that the optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From Figure 13 As can be seen, the MTF value of this embodiment is above 0.45 throughout the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating that the optical lens has good imaging quality and good detail resolution.
[0146] Example 3
[0147] Please see Figure 14 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main differences between this embodiment and Embodiment 1 are: the optical parameters such as the radius of curvature and lens thickness of each lens surface are different; the object side surface S3 of the second lens L2 is convex; the image side surface S9 of the fifth lens L5 is concave; and the fourth lens L4 and the fifth lens L5 form a cemented lens group with negative optical power.
[0148] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.
[0149] Table 3-1
[0150]
[0151] The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.
[0152] Table 3-2
[0153] Figure 15 K B C D E F S3 3.36E+00 -1.12E-03 -2.23E-05 -1.39E-06 5.66E-08 -3.61E-09 S4 -3.38E+00 -9.80E-05 -2.25E-05 3.43E-06 -3.43E-07 1.46E-08 S10 -5.00E+01 -8.16E-03 -4.20E-04 9.17E-05 -1.78E-05 1.04E-06 S11 -4.47E-01 -6.02E-03 -1.92E-04 4.31E-05 -4.80E-06 2.17E-07
[0154] In the embodiment, the field curvature curve, the F-theta distortion curve, the axial aberration curve, the transverse chromatic aberration curve and the MTF (Modulation Transfer Function) curve of the optical lens 300 are shown in FIGS. 11, 12, 13, 14 and 15, respectively. Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 and Figure 20 It can be seen from FIG. 11 that the field curvature of the meridional image surface and the sagittal image surface is controlled within -0.03 mm-0.03 mm, which indicates that the optical lens can well correct the field curvature. Figure 21 It can be seen from FIG. 12 that the F-theta distortion of the optical lens is controlled within 0-4%, and the image compression in the edge angle region is relatively gentle, which effectively improves the definition of the expanded image. Figure 22 It can be seen from FIG. 13 that the offset of the axial aberration in the embodiment is controlled within -0.01 mm-0.02 mm, which indicates that the optical lens can well correct the axial aberration. Figure 23 It can be seen from FIG. 14 that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1.5 μm-3 μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface. Figure 24 It can be seen from FIG. 15 that the MTF value of the embodiment is above 0.35 in the full field of view, and the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view in the range of 0-160 lp / mm, which indicates that the optical lens has good imaging quality and good detail resolution capability. Figure 20
[0155] Embodiment 4
[0156] Please refer to FIG. 16, which is a structural schematic diagram of an optical lens 400 provided in the embodiment 4 of the present application. Compared with the embodiment 1, the main differences are as follows: the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; the object side S3 of the second lens L2 is a convex surface; the object side S10 of the sixth lens L6 is a concave surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group with negative focal power. Figure 21
[0157] The related parameters of each lens in the optical lens 400 in the embodiment 4 are shown in Table 4-1.
[0158] Table 4-1
[0159]
[0160]
[0161] The surface shape parameters of the aspheric lenses of the optical lens 400 in Embodiment 4 are shown in Table 4-2.
[0162] Table 4-2
[0163] Figure 22 K B C D E F S3 3.06E+00 -9.26E-04 -2.45E-05 -8.01E-07 2.37E-08 -1.40E-09 S4 -3.26E-01 -2.48E-04 -2.02E-06 -1.70E-06 1.83E-07 -6.37E-09 S10 4.91E+01 -2.54E-03 -2.41E-04 5.75E-05 -9.67E-06 5.48E-07 S11 1.07E+01 -2.39E-03 -4.52E-05 -1.73E-06 -1.21E-07 -2.19E-08
[0164] In the present embodiment, the field curvature curve, F-θ distortion curve, axial aberration curve, transverse chromatic aberration curve and MTF (Modulation Transfer Function) curve of the optical lens 400 are shown in Figure 23 、 Figure 24 、 Figure 25 、 Figure 26 and Figure 27 respectively. It can be seen from Figure 28 that the field curvature of the meridional image surface and sagittal image surface is controlled within -0.03mm-0.03mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 29 that the F-θ distortion of the optical lens is controlled within 0-2%, and the image compression in the edge angle region is relatively gentle, which effectively improves the definition of the expanded image. It can be seen from Figure 30 that the shift amount of the axial aberration in the present embodiment is controlled within -0.01mm-0.03mm, which indicates that the optical lens can well correct the axial aberration. It can be seen from Figure 31 that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -2μm-3μm, which indicates that the optical lens can well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface. It can be seen from Figure 32 that the MTF value of the present embodiment is above 0.4 in the full field of view, and in the range of 0-160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, which indicates that the optical lens has good imaging quality and good detail resolution capability.
[0165] Embodiment 5
[0166] Please refer to Figure 33 , which is a structural schematic diagram of the optical lens 500 provided in Embodiment 5 of the present application. Compared with Embodiment 1, the main differences are that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the object side surface S3 of the second lens L2 is a convex surface.
[0167] The related parameters of each lens in the optical lens 500 in Embodiment 5 are shown in Table 5-1.
[0168] Table 5-1
[0169]
[0170] The surface shape parameters of the aspherical lenses of the optical lens 500 in Embodiment 5 are shown in Table 5-2.
[0171] Table 5-2
[0172] Figure 34 K B C D E F S3 -1.31E+00 -5.38E-04 -1.55E-05 -1.37E-06 9.28E-08 -1.68E-08 S4 -2.59E+00 -1.72E-04 -4.31E-05 4.82E-06 -5.77E-07 1.31E-08 S10 -5.00E+01 -9.92E-03 -1.51E-03 3.84E-04 -4.33E-05 1.93E-06 S11 -1.34E+00 -1.76E-02 7.71E-04 2.85E-05 -8.09E-06 4.01E-07
[0173] In the present embodiment, the field curvature curve, F-θ distortion curve, axial aberration curve, transverse chromatic aberration curve and MTF (Modulation Transfer Function) curve of the optical lens 500 are shown in Figure 35 , Figure 36 , Figure 32 , Figure 33 and Figure 34 respectively. It can be seen from Figure 35 that the field curvature of the meridional image surface and sagittal image surface is controlled within -0.04mm-0.03mm, which indicates that the optical lens can well correct the field curvature. It can be seen from Figure 36 that the F-θ distortion of the optical lens is controlled within 0-4.5%, and the image compression in the edge angle region is relatively gentle, which effectively improves the definition of the expanded image. It can be seen from that the shift amount of the axial aberration in the present embodiment is controlled within -0.02mm-0.02mm, which indicates that the optical lens can well correct the axial aberration. It can be seen from that the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within -1μm-4μm, which indicates that the optical lens can very well correct the chromatic aberration of the edge field of view and the secondary spectrum of the entire image surface. It can be seen from that the MTF value of the present embodiment is above 0.4 within the full field of view, and within the range of 0-160lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge field of view, which indicates that the optical lens has good imaging quality and good detail resolution capability.
[0174] Embodiment 6
[0175] Please refer to , which is a structural schematic diagram of the optical lens 600 provided in Embodiment 6 of the present application. Compared with Embodiment 1, the main differences are that the optical parameters such as the curvature radius of each lens surface and the lens thickness are different; and the object side surface S3 of the second lens L2 is a convex surface; and the object side surface S10 of the sixth lens L6 is a concave surface.
[0176] The related parameters of each lens in the optical lens 600 in Embodiment 6 are shown in Table 6-1.
[0177] Table 6-1
[0178]
[0179]
[0180] The surface profile parameters of the aspherical lens of the optical lens 600 in Example 6 are shown in Table 6-2.
[0181] Table 6-2
[0182] K B C D E F S3 -1.88E+00 3.88E-05 -2.41E-05 2.86E-06 -2.90E-07 1.00E-08 S4 -8.74E+00 -1.59E-04 -2.66E-05 5.76E-06 -7.25E-07 3.41E-08 S10 -1.51E+01 -9.70E-03 -4.27E-04 1.44E-04 -3.20E-05 2.06E-06 S11 4.82E+00 -7.87E-03 4.10E-05 2.85E-05 -5.22E-06 2.75E-07
[0183] In this embodiment, the field curvature curve, F-θ distortion curve, axial aberration curve, transverse chromatic aberration curve, and MTF (modulation transfer function) curve of the optical lens 600 are respectively as follows: , , , and As shown. From As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.04mm to 0.03mm, indicating that the optical lens can effectively correct field curvature. From As can be seen, the F-θ distortion of the optical lens is controlled within 0-5%, and the image compression in the edge angle region is relatively smooth, effectively improving the sharpness of the unfolded image. From As can be seen, the axial aberration offset in this embodiment is controlled within -0.01mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration. From As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -1μm to 3μm, indicating that the optical lens can excellently correct chromatic aberration at the edges of the field of view and the second-order spectrum of the entire image plane. From As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. Within the range of 0 to 160 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating that the optical lens has good imaging quality and good detail resolution.
[0184] Please refer to Table 7 for 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 corresponding to the maximum field of view, maximum field of view FOV, and the values corresponding to each conditional expression in each embodiment.
[0185] Table 7
[0186]
[0187]
[0188] In summary, the optical lens provided by the present application adopts six lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of low cost, high resolution, high imaging quality, etc.
[0189] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0190] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the patent scope of the present application. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.
Claims
1. An optical lens, six pieces of lenses in total, characterized in that, In order from the object side to the imaging surface along the optical axis, comprises successively: a first lens with negative refractive power, the object side surface of which is convex, and the image side surface of which is concave; a second lens with positive refractive power, the image side surface of which is convex; a third lens with positive refractive power, the object side surface of which is concave, and the image side surface of which is convex; a fourth lens with negative refractive power, both the object side surface and the image side surface of which are concave; a fifth lens with positive refractive power, the object side surface of which is convex; a sixth lens with negative refractive power, the image side surface of which is concave; wherein the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian θ of the maximum half field angle of the optical lens satisfy: 1.0 < (IH / 2) / (f×θ) < 1.1; the half light passing radius d1 of the object side surface of the first lens and the half light passing radius sag1 of the object side surface of the first lens satisfy: 0 < sag1 / d1 < 0.2; the half light passing radius d2 of the image side surface of the first lens and the half light passing radius sag2 of the image side surface of the first lens satisfy: 0.1 < sag2 / d2 < 0.
6.
2. The optical lens of claim 1, wherein, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: -4.5 < f6 / f < -1.
6.
3. The optical lens of claim 1, wherein, the curvature radius R1 of the object side surface of the first lens and the effective focal length f of the optical lens satisfy: 7.2 < R1 / f < 9.5; the curvature radius R2 of the image side surface of the first lens and the effective focal length f of the optical lens satisfy: 0.8 < R2 / f < 1.
5.
4. The optical lens of claim 1, wherein, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 5.8 < R1 / R2 < 9.
1.
5. The optical lens of claim 1, wherein, the curvature radius R1 of the object side surface of the first lens and the focal length f1 of the first lens satisfy: -4.8 < R1 / f1 < -2.9; the curvature radius R2 of the image side surface of the first lens and the focal length f1 of the first lens satisfy: -0.8 < R2 / f1 < -0.
2.
6. The optical lens of claim 1, wherein, the curvature radius R5 of the object side surface of the third lens and the focal length f3 of the third lens satisfy: -4.1 < R5 / f3 < -1.8; the curvature radius R6 of the image side surface of the third lens and the focal length f3 of the third lens satisfy: -0.8 < R6 / f3 < -0.
2.
7. The optical lens of claim 1, wherein, the curvature radius R7 of the object side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: 3.2 < R7 / f4 < 11.8; the curvature radius R8 of the image side surface of the fourth lens and the focal length f4 of the fourth lens satisfy: -1.3 < R8 / f4 < -0.
5.
8. The optical lens of claim 1, wherein, the curvature radius R1 of the object side surface of the first lens and the curvature radius R2 of the image side surface of the first lens satisfy: 0.1 < (R1-R2) / (R1+R2) < 0.
9.
9. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field angle of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 1.7 < IH / EPD < 2.
7.
10. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field angle of the optical lens, the effective focal length f of the optical lens, and the radian θ of the maximum half field angle of the optical lens satisfy: 1.0 < (IH / 2) / (f×θ) < 1.06; The first lens object side half light entrance radius d1 and the first lens object side half light entrance radius sag1 satisfy: 0 < sag1 / d1 < 0.1; the first lens image side half light entrance radius d2 and the first lens image side half light entrance radius sag2 satisfy: 0.25 < sag2 / d2 < 0.50.
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