Optical lens

Abstract

The application provides an optical lens, which comprises six lenses in sequence along an optical axis from an object side to an imaging surface, and the six lenses comprise: a first lens with negative optical power, wherein the object side surface of the first lens is a concave surface, and the image side surface of the first lens is a convex surface; a second lens with positive optical power, wherein the object side surface of the second lens is a convex surface; a third lens with positive optical power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a fourth lens with negative optical power; a fifth lens with positive optical power, wherein the object side surface and the image side surface of the fifth lens are both convex surfaces; and a sixth lens with negative optical power, wherein the image side surface of the sixth lens is a concave surface. The optical lens provided by the application adopts six lenses with specific optical power, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, the imaging quality of the optical lens can be improved, and the lens has one or more advantages such as a large target surface, a large aperture, high imaging quality and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] With the continuous improvement of people's requirements for driving experience, vehicle application type optical lenses are increasingly used in intelligent driving, and vehicle optical lenses are continuously improving in the automotive industry.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving, which collects environmental information through various lenses combined with sensors to ensure the safety of drivers. In addition to the requirements of optical lenses for the existing ADAS system, such as light and thin shape, high pixel, high resolution and other characteristics, the optical lens is required to be able to clearly image under low illumination conditions, so it is necessary to develop an optical lens with good imaging effect. SUMMARY

[0004] In view of the above problems, the purpose of the present application is to provide an optical lens with the advantages of excellent imaging quality.

[0005] The technical scheme 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 surface is concave, and the image side surface is convex;

[0008] The second lens with positive focal power, the object side surface is convex;

[0009] The third lens with positive focal power, the object side surface is convex, and the image side surface is concave;

[0010] The fourth lens with negative focal power;

[0011] The fifth lens with positive focal power, both the object side surface and the image side surface are convex;

[0012] The sixth lens with negative focal power, the image side surface is concave.

[0013] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.5.

[0014] Further preferably, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 0.58 < IH / f < 0.7.

[0015] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0016] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0017] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0018] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0019] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0020] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0021] It is further preferred that the total track length TTL of the optical lens, the maximum field of view FOV of the optical lens and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80.

[0022] 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 can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages of large target surface, large aperture, high imaging quality and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] 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:

[0024] Figure 1 The figure is a structure diagram of the optical lens in the embodiment 1 of the application.

[0025] Figure 2 The figure is a field curvature curve of the optical lens in the embodiment 1 of the application. The figure is a field curvature curve of the optical lens in the embodiment 1 of the application.

[0026] Figure 3 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 1 of the present application.

[0027] Figure 4 Structure diagram of the optical lens in Embodiment 2 of the present application.

[0028] Figure 5 Curvature of field curve of the optical lens in Embodiment 2 of the present application.

[0029] Figure 6 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 2 of the present application.

[0030] Figure 7 Structure diagram of the optical lens in Embodiment 3 of the present application.

[0031] Figure 8 Curvature of field curve of the optical lens in Embodiment 3 of the present application.

[0032] Figure 9 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 3 of the present application.

[0033] Figure 10 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0034] Figure 11 Curvature of field curve of the optical lens in Embodiment 4 of the present application.

[0035] Figure 12 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 4 of the present application.

[0036] Figure 13 Structure diagram of the optical lens in Embodiment 5 of the present application.

[0037] Figure 14 Curvature of field curve of the optical lens in Embodiment 5 of the present application.

[0038] Figure 15 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 5 of the present application.

[0039] Figure 16 Structure diagram of the optical lens in Embodiment 6 of the present application.

[0040] Figure 17 Curvature of field curve of the optical lens in Embodiment 6 of the present application.

[0041] Figure 18 F-Tan(Theta) Distortion curve of the optical lens in Embodiment 6 of the present application.

[0042] Figure 19 A structure diagram of an optical lens according to Embodiment 7 of the present application.

[0043] Figure 20 A field curvature curve of the optical lens according to Embodiment 7 of the present application.

[0044] Figure 21 An F-Tan(Theta) distortion curve of the optical lens according to Embodiment 7 of the present application.

[0045] Figure 22 A structure diagram of an optical lens according to Embodiment 8 of the present application.

[0046] Figure 23 A field curvature curve of the optical lens according to Embodiment 8 of the present application.

[0047] Figure 24 An F-Tan(Theta) distortion curve of the optical lens according to Embodiment 8 of the present application.

[0048] The following detailed description will further describe the present application with reference to the above drawings. DETAILED DESCRIPTION

[0049] 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 noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. 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.

[0050] 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.

[0051] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for the sake of 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.

[0052] In the present disclosure, the paraxial region 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 convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. 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 image plane is referred to as the image side surface of the lens.

[0053] 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 use of "may" means one or more embodiments of the present application. Also, the word "exemplary" is intended to mean an example or an illustration.

[0054] 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.

[0055] 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.

[0056] The optical lens provided by the embodiments of the present application comprises six lenses, which are sequentially arranged along the optical axis from the object side to the image plane as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens.

[0057] In some embodiments, the first lens can have a negative focal power, the object side surface thereof is concave, and the image side surface thereof is convex. The second lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof can be concave or convex. The third lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof is concave. The fourth lens can have a negative focal power, the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex. The fifth lens can have a positive focal power, the object side surface and the image side surface thereof are both convex. The sixth lens can have a negative focal power, the object side surface thereof can be concave or convex, and the image side surface thereof is concave.

[0058] In some embodiments, the optical lens can further include a diaphragm, which can be located between the first lens and the second lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the first lens and the second lens, the correction of the diaphragm aberration is facilitated.

[0059] In some embodiments, the optical lens can further include a filter, which can be disposed between the sixth lens and the imaging surface. The filter is used to filter out the interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting the normal imaging.

[0060] In some embodiments, the third lens and the fourth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to the eccentricity, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0061] In some embodiments, the fourth lens and the fifth lens can be glued to form a glued lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to the eccentricity, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; can also reduce the assembly sensitivity of the optical lens, thereby reducing the processing difficulty of the optical lens and improving the assembly yield of the optical lens.

[0062] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.5. Satisfying the above range is beneficial to limit the total length of the lens while better realizing the long-focus performance of the system.

[0063] In some embodiments, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f x tan(FOV / 2)) < 1.05. Satisfying the above range can control the size of the distortion and improve the imaging quality of the optical lens.

[0064] In some embodiments, the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.58 < IH / f < 0.7. Satisfying the above range controls the image height and focal length of the optical lens within a reasonable range, which helps the optical lens to have the characteristics of a large image surface and improve the imaging quality.

[0065] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.2 < BFL / f < 0.4. Satisfying the above range limits the optical lens to have a suitable back focus, facilitates the reasonable arrangement of the positions of the lenses, and reduces the difficulty of processing and assembly.

[0066] In some embodiments, the optical total length TTL of the optical lens, the maximum field of view FOV of the optical lens, and the real image height IH corresponding to the maximum field of view of the optical lens satisfy: 45 < 180° x TTL / (IH / 2) / (FOV / 2) < 80. Satisfying the above range is beneficial to balancing the relationship among the total length, the image height, and the field of view of the optical lens.

[0067] In some embodiments, the optical total length TTL of the optical lens and the sum ∑CT of the central thicknesses of the first lens to the sixth lens along the optical axis satisfy: 0.5 < ∑CT / TTL < 0.8. Satisfying the above range is beneficial to reasonably configuring the optical total length of the optical lens and the sum of the thicknesses of the lenses, and is helpful to achieving high-pixel characteristics and improving the imaging quality of the optical lens.

[0068] In some embodiments, the object-side light entrance aperture D1 of the first lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3 < D1 / IH / Tan(FOV / 2) < 4. Satisfying the above range is beneficial to balancing the relationship among the front-end aperture, the field of view, and the image size of the optical lens, and is helpful to miniaturization.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: f1 / f < -1.1. Satisfying the above range can make the first lens have a negative optical power, which is beneficial to reducing the inclination angle of the incident light and is helpful to collecting as much edge field of view light as possible into the rear optical lens, thereby achieving large-angle light collection.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: f2 / f > 0.8. Satisfying the above range defines that the second lens has an appropriate positive optical power, which is beneficial to the convergence of light and makes the divergent light entering the system from the front successfully enter the rear optical system, so that the light trend is more gentle, the aberration is optimized, and the resolution is improved.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: 0.9 < f3 / f < 1.5. Satisfying the above range defines that the third lens has an appropriate positive optical power, which can effectively correct the aberration generated at the front end of the lens and improve the imaging quality of the lens.

[0072] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: -1.9 < f4 / f < -0.3. Satisfying the above range defines that the fourth lens has an appropriate negative optical power, which is helpful to increasing the imaging area and improving the imaging quality.

[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: 0.4 < f5 / f < 1.1. Satisfying the above range, the fifth lens is defined to have appropriate positive refractive power, which helps to reduce aberration of the optical lens.

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: -1.3 < f6 / f < -0.5. Satisfying the above range, the sixth lens is defined to have appropriate negative refractive power, which is beneficial to increase the imaging area of the optical lens, while the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved.

[0075] In some embodiments, the effective focal length f of the optical lens and the image-side surface curvature radius R12 of the sixth lens satisfy: 0.3 < R12 / f < 0.95. Satisfying the above range, the shape of the image-side surface of the sixth lens is reasonably defined, which is beneficial to increase the imaging area.

[0076] In some embodiments, the object-side surface curvature radius R1 of the first lens and the image-side surface curvature radius R2 of the first lens satisfy: -0.6 < (R1-R2) / (R1+R2) < -0.2. Satisfying the above range, the deflection degree of light passing through the first lens is alleviated, and the difficulty of subsequent lens correction for aberration can be reduced.

[0077] In some embodiments, the object-side surface curvature radius R5 of the third lens and the image-side surface curvature radius R6 of the third lens satisfy: -0.9 < (R5-R6) / (R5+R6) < -0.5. Satisfying the above range, the correction difficulty of subsequent lens spherical aberration and chromatic aberration is reduced; at the same time, it is beneficial to the smoothness of the light path, and as much as possible to transfer the edge field light beam to the rear end of the optical lens, thereby improving the relative illumination of the optical lens.

[0078] In some embodiments, the object-side surface curvature radius R9 of the fifth lens and the image-side surface curvature radius R10 of the fifth lens satisfy: |(R9-R10) / (R9+R10)| > 1.4. Satisfying the above range, the surface shape of the object-side surface and the image-side surface of the fifth lens can be limited, the edge field light beam path can be controlled, and the off-axis aberration of the optical lens can be reduced.

[0079] In some embodiments, the optical lens satisfies the following conditional expressions: 14mm < f < 16mm; 30° < FOV < 40°; 9mm < EPD < 10mm; 23mm < TTL < 34mm; 1.5 < Fno < 1.8; 9mm < IH < 10mm; 18° < CRA < 23°; 3mm < BFL < 6.5mm. 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 angle of incidence of the optical lens, and BFL represents the back focal length of the optical lens. By satisfying the above ranges, the optical lens has one or more advantages such as a large target surface, a large aperture, and a long focal length.

[0080] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The optical lens provided by the present application can adopt a full-glass lens structure, which can reduce dispersion, effectively correct the chromatic aberration of the optical lens, and improve the imaging quality.

[0081] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an 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 lens miniaturization. More specifically, the first lens, the third lens, the fourth lens, and the fifth lens of the present application adopt a spherical lens, and the second lens and the sixth lens adopt an aspherical lens.

[0082] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0083] ;

[0084] 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 from 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.

[0085] 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.

[0086] Embodiment 1

[0087] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens provided in embodiment 1 of the application, and the optical lens comprises, along the optical axis from the object side to the imaging surface, a first lens L1, a diaphragm ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.

[0088] The first lens L1 has negative focal power, the object side S1 thereof is a concave surface, and the image side S2 thereof is a convex surface.

[0089] The second lens L2 has positive focal power, and the object side S3 and the image side S4 thereof are both convex surfaces.

[0090] The third lens L3 has positive focal power, the object side S5 thereof is a convex surface, and the image side S6 thereof is a concave surface.

[0091] The fourth lens L4 has negative focal power, and the object side S7 and the image side S8 thereof are both concave surfaces.

[0092] The fifth lens L5 has positive focal power, and the object side S9 and the image side S10 thereof are both convex surfaces.

[0093] The sixth lens L6 has negative focal power, the object side S11 thereof is a convex surface, and the image side S12 thereof is a concave surface.

[0094] The object side S13 and the image side S14 of the filter G1 are both flat surfaces.

[0095] The imaging surface S15 is a flat surface.

[0096] The second lens L2 and the sixth lens L6 are glass aspheric lenses, and the first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are glass spherical lenses.

[0097] The related parameters of each lens in the optical lens in embodiment 1 are shown in table 1-1.

[0098] Table 1-1

[0099]

[0100] The surface shape parameters of the aspherical lenses of the optical lens in Embodiment 1 are shown in Table 1-2.

[0101] Table 1-2

[0102]

[0103] In the present embodiment, the field curvature curve and the F-Tan(Theta) distortion curve of the optical lens are shown in FIGS. Figure 2 , Figure 3 respectively.

[0104] 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 ±0.05 mm, which shows that the optical lens can well correct the field curvature.

[0105] Figure 3 The F-Tan(Theta) distortion curve of Embodiment 1 is shown, which represents the distortion of light rays of different wavelengths at different image heights on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the distortion of the optical lens is controlled within -3%~0, which shows that the optical lens can well correct the distortion.

[0106] Embodiment 2

[0107] Please refer to Figure 4 , which is a structural schematic diagram of the optical lens provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that: the image side surface S4 of the second lens L2 is a concave surface; the object side surface S7 of the fourth lens L4 is a convex surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0108] The related parameters of each lens in the optical lens in Embodiment 2 are shown in Table 2-1.

[0109] Table 2-1

[0110]

[0111] The surface shape parameters of the aspherical lenses of the optical lens in Embodiment 2 are shown in Table 2-2.

[0112] Table 2-2

[0113]

[0114] In the embodiment, the field curvature curve and the F-Tan(Theta) distortion curve of the optical lens are shown in Figure 5 , Figure 6 respectively.

[0115] As can be seen from Figure 5 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1mm, which indicates that the optical lens can correct the field curvature well.

[0116] As can be seen from Figure 6 , the distortion of the optical lens is controlled within -2%~0, which indicates that the optical lens can correct the distortion well.

[0117] Embodiment 3

[0118] Please refer to Figure 7 , which is a structural schematic diagram of the optical lens provided in the embodiment 3 of the present application. Compared with the embodiment 1, the main difference is that the object side S7 of the fourth lens L4 is a convex surface; the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0119] The related parameters of each lens in the optical lens in the embodiment 3 are shown in Table 3-1.

[0120] Table 3-1

[0121]

[0122] The surface type parameters of the aspherical lens of the optical lens in the embodiment 3 are shown in Table 3-2.

[0123] Table 3-2

[0124]

[0125] In the embodiment, the field curvature curve and the F-Tan(Theta) distortion curve of the optical lens are shown in Figure 8 , Figure 9 respectively.

[0126] As can be seen from Figure 8 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1mm, which indicates that the optical lens can correct the field curvature well.

[0127] As can be seen from Figure 9 , the distortion of the optical lens is controlled within -2%~0, which indicates that the optical lens can correct the distortion well.

[0128] Embodiment 4

[0129] Please refer to Figure 10The figure shows a schematic diagram of the optical lens provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the fourth lens L4 and the fifth lens L5 form a cemented lens group; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0130] The relevant parameters of each lens in the optical lens of Example 4 are shown in Table 4-1.

[0131] Table 4-1

[0132]

[0133] The surface profile parameters of the aspherical lens in Example 4 are shown in Table 4-2.

[0134] Table 4-2

[0135]

[0136] In this embodiment, the field curvature curve and F-Tan (Theta) distortion curve of the optical lens are respectively as follows: Figure 11 , Figure 12 As shown.

[0137] from Figure 11 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.1mm, indicating that the optical lens can effectively correct the field curvature.

[0138] from Figure 12 As can be seen, the distortion of the optical lens is controlled within -3% to 0, indicating that the optical lens can effectively correct distortion.

[0139] Example 5

[0140] Please see Figure 13 The figure shows a schematic diagram of the optical lens provided in Embodiment 5 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side surface S10 of the sixth lens L6 is concave; the fourth lens L4 and the fifth lens L5 form a cemented lens group; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0141] The relevant parameters of each lens in the optical lens of Example 5 are shown in Table 5-1.

[0142] Table 5-1

[0143]

[0144] The surface profile parameters of the aspherical lens in Example 5 are shown in Table 5-2.

[0145] Table 5-2

[0146]

[0147] In the embodiment, the field curvature curve and the F-Tan(Theta) distortion curve of the optical lens are shown in Figure 14 , Figure 15 respectively.

[0148] As can be seen from Figure 14 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1mm, which shows that the optical lens can correct the field curvature well.

[0149] As can be seen from Figure 15 , the distortion of the optical lens is controlled within -3%~0, which shows that the optical lens can correct the distortion well.

[0150] Embodiment 6

[0151] Please refer to Figure 16 , which is a structural schematic diagram of the optical lens provided in the embodiment 6 of the present application. Compared with the embodiment 1, the main difference is that 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; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0152] The related parameters of each lens in the optical lens in the embodiment 6 are shown in Table 6-1.

[0153] Table 6-1

[0154]

[0155] The surface type parameters of the aspherical lens of the optical lens in the embodiment 6 are shown in Table 6-2.

[0156] Table 6-2

[0157]

[0158] In the embodiment, the field curvature curve and the F-Tan(Theta) distortion curve of the optical lens are shown in Figure 17 , Figure 18 respectively.

[0159] As can be seen from Figure 17 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1mm, which shows that the optical lens can correct the field curvature well.

[0160] As can be seen from Figure 18 , the distortion of the optical lens is controlled within -3%~0, which shows that the optical lens can correct the distortion well.

[0161] Embodiment 7

[0162] Please refer to Figure 19 , which is a structural schematic diagram of the optical lens provided in embodiment 7 of the present application. Compared with embodiment 1, the main difference is that the image side S8 of the fourth lens L4 is a convex surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0163] The related parameters of each lens in the optical lens in embodiment 7 are shown in table 7-1.

[0164] Table 7-1

[0165]

[0166] The surface type parameters of the aspherical lens of the optical lens in embodiment 7 are shown in table 7-2.

[0167] Table 7-2

[0168]

[0169] In this embodiment, the field curvature curve and the F-Tan(Theta) distortion curve of the optical lens are shown in Figure 20 and Figure 21 respectively.

[0170] As can be seen from Figure 20 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.15 mm, which indicates that the optical lens can well correct the field curvature.

[0171] As can be seen from Figure 21 , the distortion of the optical lens is controlled within 0~4%, which indicates that the optical lens can well correct the distortion.

[0172] Embodiment 8

[0173] Please refer to Figure 22 , which is a structural schematic diagram of the optical lens provided in embodiment 8 of the present application. Compared with embodiment 1, the main difference is that the image side S8 of the fourth lens L4 is a convex surface; the object side S11 of the sixth lens L6 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0174] The related parameters of each lens in the optical lens in embodiment 8 are shown in table 8-1.

[0175] Table 8-1

[0176]

[0177] The surface type parameters of the aspherical lens of the optical lens in embodiment 8 are shown in table 8-2.

[0178] Table 8-2

[0179]

[0180] In the present embodiment, the field curvature curve of the optical lens, F-Tan(Theta) distortion curve are shown in Figure 23 , Figure 24 respectively.

[0181] As can be seen from Figure 23 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05mm, which shows that the optical lens can correct the field curvature well.

[0182] As can be seen from Figure 24 , the distortion of the optical lens is controlled within -2%~0, which shows that the optical lens can correct the distortion well.

[0183] Please refer to Table 9, the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, the total optical length TTL, the aperture value Fno, the real image height IH corresponding to the maximum field of view angle, the maximum field of view angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0184] Table 9

[0185]

[0186] In summary of the above embodiments, the optical lens provided by the present application adopts six lenses with specific optical power, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens can be improved, the aberration can be reduced, and the imaging quality of the optical lens can be improved, so that the lens has one or more advantages such as large target surface, large aperture, high imaging quality, etc.

[0187] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "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.

[0188] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, several 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 plane along the optical axis, the optical lens comprises in sequence: a first lens with negative refractive power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface; a second lens with positive refractive power, the object side surface of which is a convex surface; a third lens with positive refractive power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface; a fourth lens with negative refractive power; a fifth lens with positive refractive power, both the object side surface and the image side surface of which are convex surfaces; a sixth lens with negative refractive power, the image side surface of which is a concave surface; an optical total track length TTL of the optical lens and an effective focal length f of the optical lens satisfy: 1.5 < TTL / f < 2.5; an optical total track length TTL of the optical lens, a maximum field of view FOV of the optical lens, and a real image height IH corresponding to the maximum field of view of the optical lens satisfy: 45 < 180°×TTL / (IH / 2) / (FOV / 2) < 80; the effective focal length f of the optical lens satisfies: 14 mm < f < 16 mm; the effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: 0.9 < f3 / f < 1.5; the effective focal length f of the optical lens and a radius of curvature R12 of the image side surface of the sixth lens satisfy: 0.3 < R12 / f < 0.

95.

2. The optical lens of claim 1, wherein, the effective focal length f of the optical lens, the maximum field of view FOV, and the real image height IH corresponding to the maximum field of view satisfy: 0.95 < (IH / 2) / (f×tan(FOV / 2)) < 1.

05.

3. The optical lens of claim 1, wherein, the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 0.58 < IH / f < 0.

7.

4. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: -1.9 < f4 / f < -0.

3.

5. The optical lens of claim 1, wherein, a clear aperture D1 of the object side surface of the first lens, the real image height IH corresponding to the maximum field of view of the optical lens, and the maximum field of view FOV of the optical lens satisfy: 3 < D1 / IH / Tan(FOV / 2) < 4.

6. The optical lens of claim 1, wherein, a radius of curvature R1 of the object side surface of the first lens and a radius of curvature R2 of the image side surface of the first lens satisfy: -0.6 < (R1-R2) / (R1+R2) < -0.

2.

7. The optical lens of claim 1, wherein, a radius of curvature R5 of the object side surface of the third lens and a radius of curvature R6 of the image side surface of the third lens satisfy: -0.9 < (R5-R6) / (R5+R6) < -0.

5.

8. The optical lens of claim 1, wherein, a radius of curvature R9 of the object side surface of the fifth lens and a radius of curvature R10 of the image side surface of the fifth lens satisfy: 21.16 ≥ |(R9-R10) / (R9+R10)| > 1.

4.

9. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -3.59 ≤ f1 / f < -1.1.

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