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 of the first lens is a concave surface; a second lens with positive optical power, wherein the object side of the second lens is a convex surface, and the image side of the second lens is a concave surface; a third lens with negative optical power, wherein the object side of the third lens is a convex surface, and the image side of the third lens is a concave surface; a fourth lens with positive optical power, wherein the object side and the image side of the fourth lens are both convex surfaces; a fifth lens with negative optical power; and a sixth lens with positive optical power. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration, and improve the imaging quality of the optical lens by adopting six lenses with specific optical power, specific surface shape matching and reasonable optical power distribution, so that 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 used more and more in intelligent driving, and the position of vehicle optical lenses in the automobile industry is continuously improved.

[0003] Advanced Driver Assistance System (ADAS) plays an important role in intelligent driving. It 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 ADAS system, such as light and thin shape, high pixel, high resolution and other characteristics, the optical lens is also required 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 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;

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

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

[0010] The fourth lens with positive focal power, both the object side surface and the image side surface are convex;

[0011] The fifth lens with negative focal power;

[0012] The sixth lens with positive focal power.

[0013] Further preferably, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 2.4.

[0014] Further preferably, the effective focal length f of the optical lens, the maximum field of view angle FOV of the optical lens and the real image height IH corresponding to the maximum field of view angle of the optical lens satisfy: 0.96 < (IH / 2) / (f x tan(FOV / 2)) < 1.02.

[0015] Further preferably, a real image height IH corresponding to a maximum field angle of view of the optical lens and an effective focal length f of the optical lens satisfy: 0.62 < IH / f < 0.67.

[0016] Further preferably, an effective focal length f of the optical lens and a back focal length BFL of the optical lens satisfy: 0.18 < BFL / f < 0.39.

[0017] Further preferably, an optical total length TTL of the optical lens, a maximum field angle of view FOV of the optical lens, and a real image height IH corresponding to the maximum field angle of view of the optical lens satisfy: 69 < 180° x TTL / (IH / 2) / (FOV / 2) < 71.

[0018] Further preferably, an optical total length TTL of the optical lens and a sum ∑CT of central thicknesses of the first lens to the sixth lens along the optical axis respectively satisfy: 0.64 < ∑CT / TTL < 0.88.

[0019] Further preferably, an effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -5.9 < f1 / f < -1.7.

[0020] Further preferably, an effective focal length f of the optical lens and a focal length f2 of the second lens satisfy: 1.0 < f2 / f < 1.7.

[0021] Further preferably, an effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: -1.6 < f3 / f < -0.6.

[0022] Further preferably, an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: 0.5 < f4 / f < 0.8.

[0023] Further preferably, an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: -2.4 < f5 / f < -0.7.

[0024] Further preferably, an effective focal length f of the optical lens and a focal length f6 of the sixth lens satisfy: 2.4 < f6 / f < 9.9.

[0025] Further preferably, an effective focal length f of the optical lens and a radius of curvature R1 of the object side surface of the first lens satisfy: -1.4 < R1 / f < -0.7.

[0026] Further preferably, a radius of curvature R3 of the object side surface of the second lens and a radius of curvature R4 of the image side surface of the second lens satisfy: -0.71 < (R3-R4) / (R3+R4) < -0.51.

[0027] It is further preferred that the object side surface radius of curvature R5 of the third lens and the image side surface radius of curvature R7 of the fourth lens satisfy: 1.6 < |(R5-R7) / (R5+R7)| < 5.1.

[0028] It is further preferred that the object side surface sagitta Sag1 of the first lens and the object side surface radius of curvature R1 of the first lens satisfy: 0.03 < Sag1 / R1 < 0.13.

[0029] 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 such as large target surface, large aperture, high imaging quality, etc. BRIEF DESCRIPTION OF DRAWINGS

[0030] 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:

[0031] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens in embodiment 1 of the present application.

[0032] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens in embodiment 1 of the present application.

[0033] Figure 3 FIG. 3 is an F-Tan(Theta) distortion curve diagram of the optical lens in embodiment 1 of the present application.

[0034] Figure 4 FIG. 4 is an MTF curve diagram of the optical lens in embodiment 1 of the present application.

[0035] Figure 5 FIG. 8 is a structural schematic diagram of an optical lens in embodiment 2 of the present application.

[0036] Figure 6 FIG. 9 is a field curvature curve diagram of the optical lens in embodiment 2 of the present application.

[0037] Figure 7 FIG. 10 is an F-Tan(Theta) distortion curve diagram of the optical lens in embodiment 2 of the present application.

[0038] Figure 8 FIG. 11 is an MTF curve diagram of the optical lens in embodiment 2 of the present application.

[0039] Figure 9 FIG. 14 is a structural schematic diagram of an optical lens in embodiment 3 of the present application.

[0040] Figure 10 FIG. 15 is a field curvature curve diagram of the optical lens in embodiment 3 of the present application.

[0041] Figure 11 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 3 of the present application.

[0042] Figure 12 MTF curve graph of the optical lens in Embodiment 3 of the present application.

[0043] Figure 13 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0044] Figure 14 Field curvature curve graph of the optical lens in Embodiment 4 of the present application.

[0045] Figure 15 F-Tan(Theta) distortion curve graph of the optical lens in Embodiment 4 of the present application.

[0046] Figure 16 MTF curve graph of the optical lens in Embodiment 4 of the present application.

[0047] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0048] 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.

[0049] It is to be noted that the expressions first, second, third and the like in the present specification are used only to distinguish one feature from another feature, and do not denote any limitation on the features. Thus, the first lens discussed below can also be called the second lens or the third lens without departing from the teachings of the present application.

[0050] 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.

[0051] 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.

[0052] 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 illustration".

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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 can be concave or convex. The second lens can have a positive focal power, the object side surface thereof is convex, and the image side surface thereof is concave. The third lens can have a negative focal power, the object side surface thereof is convex, and the image side surface thereof is concave. The fourth lens can have a positive focal power, both the object side surface and the image side surface thereof are convex. The fifth 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 sixth lens can have a positive focal power, the object side surface thereof can be concave or convex, and the image side surface thereof can be concave or convex.

[0057] 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 image. When the diaphragm is located between the first lens and the second lens, the correction of the diaphragm aberration is facilitated.

[0058] 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 interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0059] In some embodiments, the third lens and the fourth lens can be cemented to form a cemented lens, which can effectively correct the chromatic aberration of the optical lens, reduce the sensitivity of the optical lens to decentration, balance the aberration of the optical lens, and improve the imaging quality of the optical lens; and 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.

[0060] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 2.4. Satisfying the above range is beneficial to limit the total length of the lens and realize miniaturization.

[0061] In some embodiments, the effective focal length f 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: 0.96 < (IH / 2) / (f x tan(FOV / 2)) < 1.02. Satisfying the above range can control the optical lens to have small distortion and improve the imaging quality of the optical lens.

[0062] 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: 0.62 < IH / f < 0.67. Satisfying the above range controls the image height and focal length of the optical lens to be within a reasonable range, which helps the optical lens to have the characteristics of a large image surface and improves the imaging quality.

[0063] In some embodiments, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.18 < BFL / f < 0.39. 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.

[0064] In some embodiments, the optical 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 of the optical lens satisfy: 69 < 180° x TTL / (IH / 2) / (FOV / 2) < 71. Satisfying the above range, the length of the optical lens is limited, and the optical lens is miniaturized under the condition of the same imaging area and the same field of view.

[0065] In some embodiments, the optical total track 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: 0.64 < ∑CT / TTL < 0.88. Satisfying the above range, the optical total track length of the optical lens and the sum of the thicknesses of the lenses are reasonably configured, which is helpful to realize high pixel characteristics and improve the imaging quality of the optical lens.

[0066] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -5.9 < f1 / f < -1.7. Satisfying the above range, the field of view light can be received and diffused to the rear, and the smooth transition of the light beam is realized.

[0067] In some embodiments, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.0 < f2 / f < 1.7. Satisfying the above range, the light rays diverged by the first lens can be converged, which is helpful to make the light rays smoothly transition and improve the imaging quality of the optical lens.

[0068] In some embodiments, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -1.6 < f3 / f < -0.6. Satisfying the above range, the light rays from the second lens can be received and diffused, the optical path of the edge field of view light is increased, and the smooth transition of the light beam is further realized.

[0069] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.5 < f4 / f < 0.8. Satisfying the above range, the light rays are converged, and the third lens with negative optical power and the fourth lens with positive optical power are matched, which can adjust the optical path difference between different fields of view, improve the resolution, make the light rays smoothly enter the rear lens, and further reduce the field curvature and correct the off-axis point aberration of the optical lens.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.4 < f5 / f < -0.7. Satisfying the above range, the fifth lens is limited to have negative optical power, the light rays emitted by the fourth lens are diverged, the light rays of the edge field of view are in an upward trend, and the image points on the imaging surface are away from the optical axis, which is helpful to realize the effect of matching with a large chip and obtain a larger picture.

[0071] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.4 < f6 / f < 9.9. Satisfying the above range, the sixth lens is defined to have positive refractive power, which is conducive to light convergence, smooth transition of light trend to the rear, reduction of the height of light incident to the rear, slowing down of the upward trend of light, avoidance of light energy loss caused by too large angle between the main light of the chip and the imaging surface when the large field of view light reaches the imaging surface, improvement of the illumination of the edge field of view, and realization of short optical total length.

[0072] In some embodiments, the effective focal length f of the optical lens and the curvature radius R1 of the object side of the first lens satisfy: -1.4 < R1 / f < -0.7. Satisfying the above range, the collected light can be as much as possible in the form of divergence into the rear lens, while effectively reducing the angle between the edge field of view light and the object side of the first lens when the light is incident, and improving the overall edge relative illumination of the lens.

[0073] In some embodiments, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: -0.71 < (R3-R4) / (R3+R4) < -0.51. Satisfying the above range, as much light as possible can be collected into the rear optical system, and the light can be as smoothly as possible into the rear optical system, which is conducive to realization of low sensitivity and small front aperture of the optical lens.

[0074] In some embodiments, the curvature radius R5 of the object side of the third lens and the curvature radius R7 of the image side of the fourth lens satisfy: 1.6 < |(R5-R7) / (R5+R7)| < 5.1. Satisfying the above range, the cemented lens formed by the combination of the third lens and the fourth lens is double-convex, which makes it easier to adjust the light.

[0075] In some embodiments, the sag Sag1 of the object side of the first lens and the curvature radius R1 of the object side of the first lens satisfy: 0.03 < Sag1 / R1 < 0.13. It is conducive to collection of large field of view light, realization of high angular resolution of the center of the optical lens, and improvement of the imaging quality of the center region.

[0076] In some embodiments, the optical lens satisfies the following conditional expressions: 15.0mm < f < 15.4mm; 35° < FOV < 37°; 9.3mm < EPD < 9.7mm; 34.0mm < TTL < 34.7mm; 1.5 < Fno < 1.7; 9.6mm < IH < 9.9mm; 21.9° < CRA < 22.4°; 2.9mm < BFL < 5.8mm. 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 at the maximum image height of the optical lens, and BFL represents the back focal length of the optical lens. The optical lens satisfies the above ranges, and has one or more advantages such as a large target surface, a large aperture, and a long focal length.

[0077] 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 characteristics of the glass. 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.

[0078] 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.

[0079] 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:

[0080]

[0081] 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.

[0082] 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.

[0083] Embodiment 1

[0084] 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.

[0085] The first lens L1 has negative focal power, the object side S1 is a concave surface, and the image side S2 is a convex surface.

[0086] The second lens L2 has positive focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface.

[0087] The third lens L3 has negative focal power, the object side S5 is a convex surface, and the image side S6 is a concave surface.

[0088] The fourth lens L4 has positive focal power, and both the object side S6 and the image side S7 are convex surfaces.

[0089] The third lens L3 and the fourth lens L4 form a cemented lens group, that is, the cemented surface of the image side of the third lens L3 and the object side of the fourth lens L4 is S6.

[0090] The fifth lens L5 has negative focal power, the object side S8 is a convex surface, and the image side S9 is a concave surface.

[0091] The sixth lens L6 has positive focal power, the object side S10 is a convex surface, and the image side S11 is a concave surface.

[0092] The object side S12 and the image side S13 of the filter G1 are both flat surfaces.

[0093] The imaging surface S14 is a flat surface.

[0094] The second lens L2 and the sixth lens L6 adopt glass aspherical lenses, and the first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 adopt glass spherical lenses.

[0095] The related parameters of each lens in the optical lens in embodiment 1 are shown in Table 1-1.

[0096] Table 1-1

[0097]

[0098]

[0099] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0100] Table 1-2

[0101] Face number K B C D E F G S3 -2.31E+00 0.00E+00 2.09E-04 3.67E-07 7.98E-10 1.50E-10 -2.63E-13 S4 4.50E+00 0.00E+00 6.89E-05 2.92E-06 4.52E-08 -1.36E-09 2.92E-11 S10 -9.05E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 -5.09E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0102] In this embodiment, the field curvature curve, F-Tan(Theta) distortion curve and MTF curve of the optical lens are shown in FIGS. Figure 2 、 Figure 3 、 Figure 4

[0103] Figure 2 The field curvature curve of Example 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.

[0104] Figure 3 The F-Tan(Theta) distortion curve of Example 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 ±2%, which shows that the optical lens can well correct the distortion.

[0105] Figure 4 The MTF (Modulation Transfer Function) curve of Example 1 is shown, which represents the imaging modulation degree of the lens at 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. It can be seen from the figure that the MTF value of this embodiment is above 0.5 within the full field of view, and in the range of 0-120 lp / mm, the MTF curve uniformly and smoothly decreases from the center to the edge of the field of view, and has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0106] Example 2

[0107] Please refer to Figure 5 ​The figure shows a schematic diagram of the optical lens provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S8 of the fifth lens L5 is concave and the image side S9 is convex; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

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

[0109] Table 2-1

[0110]

[0111]

[0112] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0113] Table 2-2

[0114] Face number K B C D E F G S3 -2.35E+00 0.00E+00 2.19E-04 1.98E-07 1.77E-09 1.16E-10 2.68E-13 S4 3.71E+01 0.00E+00 5.10E-05 -4.00E-07 1.29E-07 -3.46E-09 4.88E-11 S10 -9.25E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 6.71E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0115] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 6 , Figure 7 , Figure 8 As shown.

[0116] from Figure 6 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.

[0117] from Figure 7 As can be seen, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0118] from Figure 8 As can be seen, the MTF value of this embodiment is above 0.4 throughout the entire field of view. In the range of 0 to 120 lp / mm, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view. It has good imaging quality and good detail resolution in both low and high frequency conditions.

[0119] Example 3

[0120] Please see Figure 9 The figure shows a schematic diagram of the optical lens provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the object side S8 of the fifth lens is concave and the image side S9 is convex; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0121] The related parameters of each lens in the optical lens in Embodiment 3 are shown in Table 3-1.

[0122] Table 3-1

[0123]

[0124] The surface type parameters of the aspherical lens of the optical lens in Embodiment 3 are shown in Table 3-2.

[0125] Table 3-2

[0126] Face number K B C D E F G S3 -2.69E+00 0.00E+00 4.61E-04 -4.06E-07 1.07E-08 4.23E-10 5.70E-12 S4 -6.90E-01 0.00E+00 2.27E-04 4.21E-06 5.87E-08 -3.62E-09 1.74E-10 S10 -8.00E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 6.80E+01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0127] In this embodiment, the field curvature curve, F-Tan(Theta) distortion curve and MTF curve of the optical lens are shown in Figure 10 , Figure 11 , Figure 12 respectively.

[0128] As can be seen from Figure 10 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which shows that the optical lens can correct the field curvature well.

[0129] As can be seen from Figure 11 , the distortion of the optical lens is controlled within ±4%, which shows that the optical lens can correct the distortion well.

[0130] As can be seen from Figure 12 , the MTF value of this embodiment is above 0.3 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and has general imaging quality and general detail resolution ability in the case of low frequency and high frequency.

[0131] Embodiment 4

[0132] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens provided in Embodiment 4 of the present application, and compared with Embodiment 1, the main difference is that the image side surface of the first lens L1 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0133] The related parameters of each lens in the optical lens in Embodiment 4 are shown in Table 4-1.

[0134] Table 4-1

[0135]

[0136] The surface type parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0137] Table 4-2

[0138] Face number K B C D E F G S3 -1.24E+00 0.00E+00 1.80E-04 5.49E-06 -7.96E-08 2.00E-09 -3.49E-12 S4 1.21E+01 0.00E+00 3.14E-04 1.00E-06 3.21E-07 -9.60E-09 1.51E-10 S10 -3.56E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 1.45E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0139] In the embodiment, the field curvature curve, the F-Tan(Theta) distortion curve and the MTF curve of the optical lens are shown in Figure 14 、 Figure 15 、 Figure 16 respectively.

[0140] As can be seen from Figure 14 , the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which indicates that the optical lens can correct the field curvature well.

[0141] As can be seen from Figure 15 , the distortion of the optical lens is controlled within ±2%, which indicates that the optical lens can correct the distortion well.

[0142] As can be seen from Figure 16 , the MTF value of the embodiment is above 0.4 in the full field of view, and in the range of 0-120 lp / mm, the MTF curve is uniformly and smoothly decreased from the center to the edge of the field of view, and the imaging quality and the detail resolution ability are good in the low frequency and high frequency conditions.

[0143] Please refer to Table 5, which is 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, the chief ray angle of incidence CRA at the maximum image height, the maximum field of view FOV of the optical lens, and the numerical value corresponding to each conditional expression in each embodiment.

[0144] Table 5

[0145]

[0146]

[0147] 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.

[0148] 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0149] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, 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; a second 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 third lens with negative 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 positive refractive power, both the object side surface and the image side surface of which are convex surfaces; a fifth lens with negative refractive power; a sixth lens with positive refractive power; the total optical 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: 69 < 180°×TTL / (IH / 2) / (FOV / 2) < 71; the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 2.2 < TTL / f < 2.

4.

2. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -2.4 < f5 / f < -0.

7.

3. The optical lens of claim 1, wherein, the effective focal length f 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: 0.96 < (IH / 2) / (f×tan(FOV / 2)) < 1.

02.

4. 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: 0.62 < IH / f < 0.

67.

5. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the back focal length BFL of the optical lens satisfy: 0.18 < BFL / f < 0.

39.

6. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -5.9 < f1 / f < -1.7, and the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 2.4 < f6 / f < 9.

9.

7. The optical lens of claim 1, wherein, the total optical 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: 0.64 < ∑CT / TTL < 0.

88.

8. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f2 of the second lens satisfy: 1.0 < f2 / f < 1.

7.

9. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -1.6 < f3 / f < -0.

6.

10. The optical lens of claim 1, wherein, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.5 < f4 / f < 0.

8.

11. The optical lens of claim 1, wherein, the object side surface curvature radius R3 of the second lens and the image side surface curvature radius R4 of the second lens satisfy: -0.71 < (R3-R4) / (R3+R4) < -0.

51.

12. The optical lens of claim 1, wherein, the object side surface curvature radius R5 of the third lens and the image side surface curvature radius R7 of the fourth lens satisfy: 1.6 < |(R5-R7) / (R5+R7)| < 5.1.

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