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; a second lens with positive optical power, wherein an object side surface of the second lens is a convex surface and an image side surface of the second lens is a concave surface; a third lens with negative optical power, wherein an image side surface of the third lens is a concave surface; a fourth lens with positive optical power, wherein both an object side surface and an image side surface of the fourth lens are convex surfaces; a fifth lens with negative optical power, wherein an object side surface of the fifth lens is a concave surface and an image side surface of the fifth lens is a convex surface; and a sixth lens with positive optical power. 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 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] a first lens with negative focal power;

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

[0009] a third lens with negative focal power, the image side surface is concave;

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

[0011] a fifth lens with negative focal power, the object side surface is concave, and the image side surface is convex;

[0012] a 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 FOV of the optical lens, and the real image height IH corresponding to the maximum field of view FOV of the optical lens satisfy: 0.96 < (IH / 2) / (f x tan(FOV / 2)) < 1.03.

[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 < 0.34.

[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) < 72.

[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: 0.53 < ∑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: -6.8 < f1 / f < -4.9.

[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 < 1.4.

[0021] Further preferably, an effective focal length f of the optical lens and a focal length f3 of the third lens satisfy: -0.9 < f3 / f < -0.4.

[0022] Further preferably, an effective focal length f of the optical lens and a focal length f4 of the fourth lens satisfy: 0.4 < f4 / f < 0.7.

[0023] Further preferably, an effective focal length f of the optical lens and a focal length f5 of the fifth lens satisfy: -3.1 < 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: 7.1 < f6 / f < 10.0.

[0025] Further preferably, an effective focal length f of the optical lens and an image-side surface curvature radius R7 of the fourth lens satisfy: -2.3 < R7 / f < -0.5.

[0026] Further preferably, an object-side surface curvature radius R3 of the second lens and an image-side surface curvature radius R4 of the second lens satisfy: -0.71 < (R3-R4) / (R3+R4) < -0.39.

[0027] It is further preferred that the object side surface radius of curvature R8 of the fifth lens and the image side surface radius of curvature R9 of the fifth lens satisfy: -0.72 < (R8-R9) / (R8+R9) < -0.17.

[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: 0.002 < 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 a large target surface, a large aperture, high imaging quality, and the like. 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 10This is a field curvature curve of the optical mirror in Embodiment 3 of the present invention.

[0041] Figure 11 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 3 of the present invention.

[0042] Figure 12 This is an MTF curve of the optical lens in Embodiment 3 of the present invention.

[0043] Figure 13 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0044] Figure 14 This is a field curvature curve of the optical mirror in Embodiment 4 of the present invention.

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

[0046] Figure 16 This is the MTF curve of the optical lens in Embodiment 4 of the present invention.

[0047] Figure 17 This is a schematic diagram of the optical lens structure in Embodiment 5 of the present invention.

[0048] Figure 18 This is a field curvature curve of the optical mirror in Embodiment 5 of the present invention.

[0049] Figure 19 This is an F-Tan (Theta) distortion curve of the optical lens in Embodiment 5 of the present invention.

[0050] Figure 20 This is the MTF curve of the optical lens in Embodiment 5 of the present invention.

[0051] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0052] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0053] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0054] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0055] In this document, the paraxial region refers to a region near the optical axis. If the 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 the 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0056] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, mean that something is present, but do not exclude the presence of one or more additional 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". Also, the word "exemplary" is intended to mean an example or an illustration.

[0057] 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.

[0058] 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 drawings and in combination with the embodiments.

[0059] 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 imaging surface as the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens.

[0060] In some embodiments, the first lens can have a negative focal power, the object side surface can be a concave surface or a convex surface, and the image side surface can be a concave surface or a convex surface. The second lens can have a positive focal power, the object side surface can be a convex surface, and the image side surface can be a concave surface. The third lens can have a negative focal power, the object side surface can be a concave surface or a convex surface, and the image side surface can be a concave surface. The fourth lens can have a positive focal power, both the object side surface and the image side surface can be convex surfaces. The fifth lens can have a negative focal power, the object side surface can be a concave surface, and the image side surface can be a convex surface. The sixth lens can have a positive focal power, the object side surface can be a concave surface or a convex surface, and the image side surface can be a concave surface or a convex surface.

[0061] 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.

[0062] 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.

[0063] In some embodiments, the third lens and the fourth lens can be bonded to form a bonded 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. In addition, the bonded 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.

[0064] 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 achieve miniaturization.

[0065] 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)) < 1.03. Satisfying the above range can control the optical lens to have small distortion and improve the imaging quality of the optical lens.

[0066] 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 a large image surface and improves the imaging quality.

[0067] 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 < 0.34. Satisfying the above range, the optical lens is limited to have a suitable back focus, the positions of the lenses are reasonably arranged, and the processing and assembling difficulty is reduced.

[0068] In some embodiments, 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: 69 < 180°xTTL / (IH / 2) / (FOV / 2) < 72. Satisfying the above range, the length of the optical lens is limited in the case of the same imaging area and the same field of view, and the optical lens is miniaturized.

[0069] In some embodiments, the total track length TTL of the optical lens and the sum ∑CT of the center thicknesses of the first lens to the sixth lens along the optical axis satisfy: 0.53 < ∑CT / TTL < 0.88. Satisfying the above range, the 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.

[0070] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -6.8 < f1 / f < -4.9. 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.

[0071] 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 < 1.4. Satisfying the above range, the light rays dispersed by the first lens can be converged, which is conducive to the smooth transition of the light rays and improves the imaging quality of the optical lens.

[0072] 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 < -0.4. 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.

[0073] In some embodiments, the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: 0.4 < f4 / f < 0.7. Satisfying the above range, the light rays are converged, the third lens with negative optical power and the fourth lens with positive optical power are matched, the optical path difference between different fields of view is adjusted, the resolution is improved, the light rays are smoothly introduced into the rear lens, the field curvature is further reduced, and the off-axis point aberration of the optical lens is corrected.

[0074] In some embodiments, the effective focal length f of the optical lens and the focal length f5 of the fifth lens satisfy: -3.1 < f5 / f < -0.7. Satisfying the above range, the fifth lens is defined to have a negative refractive power, which can diverge the light rays emitted by the fourth lens, so that the light rays of the edge field have an upward trend, which is beneficial to the image points on the imaging surface away from the optical axis, so as to realize the effect of matching with a large chip and obtain a larger picture.

[0075] In some embodiments, the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 7.1 < f6 / f < 10.0. Satisfying the above range, the sixth lens is defined to have a positive refractive power, which is beneficial to the convergence of light rays, so that the light rays smoothly transition to the rear, reduce the height of the light rays incident to the rear, slow down the upward trend of the light rays, avoid the light energy loss caused by the large chief ray angle of the large field of view light rays reaching the imaging surface, and is beneficial to improve the illumination of the edge field and realize a short total optical length.

[0076] In some embodiments, the effective focal length f of the optical lens and the image side surface curvature radius R7 of the fourth lens satisfy: -2.3 < R7 / f < -0.5. Satisfying the above range, the emitted light rays can be deflected inward, which is beneficial to reduce the rear aperture, and thus the optical lens can be miniaturized.

[0077] In some embodiments, 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) < -0.39. Satisfying the above range, as many light rays as possible can be collected into the rear optical system, so that the light rays enter the rear optical system as smoothly as possible, which is beneficial to realize low sensitivity and small front aperture of the optical lens.

[0078] In some embodiments, the object side surface curvature radius R8 of the fifth lens and the image side surface curvature radius R9 of the fifth lens satisfy: -0.72 < (R8-R9) / (R8+R9) < -0.17. Satisfying the above range, as many light rays as possible can be collected into the rear optical system, so that the light rays enter the rear optical system as smoothly as possible, which is beneficial to realize low sensitivity and small front aperture of the optical lens.

[0079] In some embodiments, the object side surface sag Sag1 of the first lens and the object side surface curvature radius R1 of the first lens satisfy: 0.002 < Sag1 / R1 < 0.13. It is beneficial to collect large field of view light rays, realize high angular resolution at the center of the optical lens, and thus improve the imaging quality of the central region.

[0080] In some embodiments, the optical lens satisfies the following conditional expressions: 14.9mm < f < 15.4mm; 35° < FOV < 37°; 9.3mm < EPD < 9.7mm; 34.1mm < TTL < 35.3mm; 1.5 < Fno < 1.7; 9.6mm < IH < 10.0mm; 21.9° < CRA < 22.4°; 2.9mm < BFL < 5.0mm. 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.

[0081] 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.

[0082] 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.

[0083] 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:

[0084]

[0085] 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.

[0086] 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.

[0087] Embodiment 1

[0088] 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.

[0089] 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.

[0090] The second lens L2 has positive focal power, the object side S3 thereof is a convex surface, and the image side S4 thereof is a concave surface.

[0091] The third lens L3 has negative focal power, and both the object side S5 and the image side S6 thereof are concave surfaces.

[0092] The fourth lens L4 has positive focal power, and both the object side S6 and the image side S7 thereof are convex surfaces.

[0093] 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.

[0094] The fifth lens L5 has negative focal power, the object side S8 thereof is a concave surface, and the image side S9 thereof is a convex surface.

[0095] The sixth lens L6 has positive focal power, the object side S10 thereof is a convex surface, and the image side S11 thereof is a concave surface.

[0096] The object side S12 and the image side S13 of the filter G1 are both flat surfaces.

[0097] The imaging surface S14 is a flat surface.

[0098] 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.

[0099] The related parameters of each lens in the optical lens in embodiment 1 are shown in table 1-1.

[0100] Table 1-1

[0101]

[0102]

[0103] The surface parameters of the aspherical lens of the optical lens in Example 1 are shown in Table 1-2.

[0104] Table 1-2

[0105] Face number K B C D E F G S3 -2.07E+00 0.00E+00 2.38E-04 4.26E-07 5.74E-09 1.91E-10 -1.96E-13 S4 5.35E+01 0.00E+00 8.23E-05 5.30E-07 1.31E-07 -3.76E-09 7.36E-11 S10 -7.57E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 4.72E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0106] In this embodiment, the field curvature curve, F-Tan(Theta) distortion curve and MTF curve of the optical lens are shown in FIGS. 1-1, 1-2 and 1-3, respectively. Figure 2 Figure 3 Figure 4

[0107] Figure 2 The field curvature curve of Example 1 is shown, which represents the curvature of the meridional image surface and the sagittal image surface of light rays of different wavelengths, 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 ±0.1 mm, which shows that the optical lens can better correct the field curvature.

[0108] 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.

[0109] 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 in 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 low and high frequency conditions.

[0110] Example 2

[0111] 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 surface S5 of the third lens L3 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0112] The relevant parameters of each lens in the optical lens of Example 2 are shown in Table 2-1.

[0113] Table 2-1

[0114]

[0115] The surface profile parameters of the aspherical lens in Example 2 are shown in Table 2-2.

[0116] Table 2-2

[0117] 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

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] Example 3

[0123] 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 S5 of the third lens L3 is a convex surface; the object side S10 of the sixth lens L6 is a concave surface, and the image side S11 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0124] The relevant parameters of each lens in the optical lens of Example 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127] The surface parameters of the aspherical lens of the optical lens in Example 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130]

[0131] In the present 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.

[0132] As can be seen from Figure 10 , the field curvature of the sagittal image surface and the tangential image surface is controlled within ±0.1 mm, which shows that the optical lens can correct the field curvature well.

[0133] 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.

[0134] As can be seen from Figure 12 , the MTF value of the present 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.

[0135] Example 4

[0136] Please refer to Figure 13 , which is a structural schematic diagram of the optical lens provided in Example 4 of the present application. Compared with Example 1, the main difference is that the image side surface S2 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.

[0137] The related parameters of each lens in the optical lens in Example 4 are shown in Table 4-1.

[0138] Table 4-1

[0139]

[0140]

[0141] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 4 are shown in Table 4-2.

[0142] Table 4-2

[0143] Face number K B C D E F G S3 -1.30E+00 0.00E+00 2.47E-04 6.52E-06 -2.28E-07 7.83E-09 -6.27E-11 S4 -7.48E+01 0.00E+00 7.85E-04 -2.01E-05 1.37E-06 -4.63E-08 9.27E-10 S10 -5.00E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 5.07E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0144] In the present 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.

[0145] 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.

[0146] 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.

[0147] As can be seen from Figure 16 , the MTF value of the present 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 optical lens has good imaging quality and good detail resolution ability in the case of low frequency and high frequency.

[0148] Embodiment 5

[0149] Please refer to Figure 17 , which is a structural schematic diagram of the optical lens provided in Embodiment 5 of the present application. Compared with Embodiment 1, the main difference is that the object side S1 of the first lens L1 is a convex surface, and the image side S2 is a concave surface; the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0150] The related parameters of each lens in the optical lens in Embodiment 5 are shown in Table 5-1.

[0151] Table 5-1

[0152]

[0153]

[0154] The surface shape parameters of the aspherical lens of the optical lens in Embodiment 5 are shown in Table 5-2.

[0155] Table 5-2

[0156] Face number K B C D E F G S3 -3.10E-01 0.00E+00 1.21E-04 6.51E-06 -2.62E-07 1.09E-08 -1.07E-10 S4 -4.74E+01 0.00E+00 9.87E-04 -2.69E-05 1.76E-06 -5.04E-08 1.12E-09 S10 -7.17E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 S11 7.04E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00

[0157] In this embodiment, the field curvature curve, F-Tan (Theta) distortion curve, and MTF curve of the optical lens are respectively as follows: Figure 18 , Figure 19 , Figure 20 As shown.

[0158] from Figure 18 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.

[0159] from Figure 19 As can be seen, the distortion of the optical lens is controlled within ±2%, indicating that the optical lens can effectively correct distortion.

[0160] from Figure 20 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.

[0161] Please refer to Table 6 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, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0162] Table 6

[0163]

[0164] In summary, the optical lens provided by the present invention uses six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as large target surface, large aperture, and high imaging quality.

[0165] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this 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 may be combined in any suitable manner in one or more embodiments or examples.

[0166] 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, successively comprise: a first lens with negative refractive power; a second lens with positive refractive power, the object side surface of which is convex, and the image side surface of which is concave; a third lens with negative refractive power, the image side surface of which is concave; a fourth lens with positive refractive power, both the object side surface and the image side surface of which are convex; a fifth lens with negative refractive power, the object side surface of which is concave, and the image side surface of which is convex; 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) < 72. In particular, 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 according to claim 1, wherein the effective focal length f of the optical lens and the focal length f3 of the third lens satisfy: -0.9 < f3 / f < -0.

4.

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.

03.

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.

34.

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: -6.8 < f1 / f < -4.9; and the effective focal length f of the optical lens and the focal length f6 of the sixth lens satisfy: 7.1 < f6 / f < 10.

0.

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: 0.53 < ∑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.

4.

9. 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: -3.1 < f5 / f < -0.

7.

10. 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.

39.

11. The optical lens of claim 1, wherein, The object side surface curvature radius R8 of the fifth lens and the image side surface curvature radius R9 of the fifth lens satisfy: -0.72 < (R8-R9) / (R8+R9) < -0.17.

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