A large image plane athermal optical imaging lens

Abstract

The present invention discloses a large image plane athermal optical imaging lens, which includes a first lens to an eleventh lens; the first lens to the eleventh lens each include an object side surface and an image side surface; the first lens has a positive refractive power; the second lens has a negative refractive power; the third lens has a negative refractive power; the fourth lens has a positive refractive power; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power; the seventh lens has a negative refractive power; the eighth lens has a positive refractive power; the ninth lens has a positive refractive power; the tenth lens has a negative refractive power; the eleventh lens has a positive refractive power; the lens has only the above eleven lenses with refractive power. The field of view of the present invention can reach 70°, the imaging surface size is ∅11mm, the optical distortion is controlled within 2.1%, the corresponding deformation of the image and the object is small, the picture is clear and not deformed, the imaging quality is high, and there is no need for post-image algorithm to correct the distortion; the vertical axis chromatic aberration and axial chromatic aberration of the lens are small, the field of view chromatic aberration is small, the color reproduction is good, and the blue-purple edge phenomenon is not obvious.

Description

Technical Field

[0001] The present invention relates to the field of lens technology, and in particular to a large image plane athermal optical imaging lens. Background Art

[0002] With the continuous progress of science and technology and the continuous development of society, optical imaging lenses have also developed rapidly in recent years. Optical imaging lenses are widely used in various fields such as industrial machine vision systems, smart phones, vehicle monitoring, security monitoring, etc. However, the optical imaging lenses currently used in the industrial field on the market have at least the following shortcomings:

[0003] 1. The existing imaging lenses used in the industrial field have insufficient field of view and small imaging surface.

[0004] 2. Existing imaging lenses used in industrial fields will have blue-purple fringing phenomenon.

[0005] 3. The existing imaging lenses used in the industrial field have a lengthy structure.

[0006] 4. Existing imaging lenses used in the industrial field have large temperature drift. When the temperature disturbance is too large, the imaging quality is affected. Summary of the invention

[0007] An object of the present invention is to provide a large image plane athermal optical imaging lens to solve at least one of the above problems.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A large image surface athermal optical imaging lens, comprising a first lens to an eleventh lens in sequence from an object side to an image side along an optical axis; each of the first lens to the eleventh lens comprises an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough;

[0010] The first lens has a positive refractive power, and the object side surface of the first lens is a convex surface, and the image side surface is a concave surface;

[0011] The second lens has a negative refractive power, and the object side surface of the second lens is a convex surface and the image side surface is a concave surface;

[0012] The third lens has a negative refractive power, and the object side surface and the image side surface of the third lens are concave;

[0013] The fourth lens has a positive refractive power, and the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface;

[0014] The fifth lens has a positive refractive power, the object side surface of the fifth lens is a convex surface, and the image side surface is a flat surface;

[0015] The sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex;

[0016] The seventh lens has a negative refractive power, and the object side surface of the seventh lens is a convex surface, and the image side surface is a concave surface;

[0017] The eighth lens has a positive refractive power, and the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface;

[0018] The ninth lens has a positive refractive power, the object side surface of the ninth lens is a flat surface, and the image side surface is a convex surface;

[0019] The tenth lens has a negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface is a convex surface;

[0020] The eleventh lens has a positive refractive power, and the object side surface and the image side surface of the eleventh lens are convex;

[0021] The optical imaging lens has only the eleven lenses having the refractive powers mentioned above.

[0022] Preferably, the image-side surface of the seventh lens and the object-side surface of the eighth lens are glued to each other and satisfy:

[0023] Vd7≤24, Vd8≥52, and |Vd8-Vd7|>28, wherein Vd7 is the dispersion coefficient of the seventh lens, and Vd8 is the dispersion coefficient of the eighth lens.

[0024] Preferably, the image-side surface of the ninth lens and the object-side surface of the tenth lens are glued to each other and satisfy:

[0025] Vd9≥68, Vd10≤21, and |Vd9-Vd10|>47, wherein Vd9 is the dispersion coefficient of the ninth lens, and Vd10 is the dispersion coefficient of the tenth lens.

[0026] Preferably, the lens further includes an aperture stop, and the aperture stop is arranged between the fifth lens and the sixth lens.

[0027] Preferably, the refractive index temperature coefficients dn / dt of the sixth lens and the ninth lens are both negative values.

[0028] Preferably, the focal lengths of the first to eleventh lenses and the focal length of the entire lens satisfy the following conditions:

[0029] 4.6<|(f1 / f)|<4.8, 2.1<|(f2 / f)|<2.3, 1.2<|(f3 / f)|<1.3,

[0030] 7.3<|(f4 / f)|<9.7, 3.1<|(f5 / f)|<3.5, 2.1<|(f6 / f)|<2.4,

[0031] 1.4<|(f7 / f)|<1.6, 1.8<|(f8 / f)|<1.9, 1.2<|(f9 / f)|<1.4,

[0032] 1.2<|(f10 / f)|<1.3, 1.9<|(f11 / f)|<2,

[0033] Among them, f is the focal length of the lens, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, and f11 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens respectively.

[0034] Preferably, the lens meets the following condition: TTL<57 mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis.

[0035] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0036] 1. The viewing angle of the present invention can reach 70°, and the imaging surface size is The optical distortion is controlled within 2.1%, the corresponding deformation of the image and the object is small, the picture is clear and not deformed, the imaging quality is high, and there is no need for post-processing image algorithms to correct the distortion.

[0037] 2. The lens of the present invention has small vertical axis chromatic aberration and axial chromatic aberration, small field chromatic aberration, good color reproduction, and no obvious blue-purple fringing phenomenon.

[0038] 3. The TTL of the present invention is less than 57 mm, which makes the total length of the lens short, the structure compact and the practicality strong.

[0039] 4. In the present invention, the refractive index temperature coefficients dn / dt of the sixth lens and the ninth lens are both negative, and the optical focal lengths of the two lenses are both positive. The lens is designed to be athermalized through optimization of the optical structure, and the temperature drift is small. When the lens is used in a high and low temperature range, the image can be clear without loss of focus, which can meet most of the requirements of the use environment.

[0040] 5. The CRA of the present invention is less than 4.5°, which matches the sensor, has good color reproduction and uniform illumination. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a light path diagram of Embodiment 1;

[0042] Figure 2This is the MTF curve of the lens in Example 1 under visible light 440nm-640nm;

[0043] Figure 3 is a defocus curve diagram of the lens in Example 1 under visible light 440nm-640nm;

[0044] Figure 4 is a vertical axis chromatic aberration curve of the lens in Example 1 under visible light 530nm;

[0045] Figure 5 axial chromatic aberration curve of the lens in Example 1 under visible light 440nm-640nm;

[0046] Figure 6 The field curvature and distortion diagram of the lens in Example 1 under visible light 440nm-640nm;

[0047] Figure 7 is a spot diagram of the lens in Example 1;

[0048] Figure 8 This is the optical path diagram of Embodiment 2;

[0049] Fig. 9 This is the MTF curve of the lens in Example 2 under visible light 440nm-640nm;

[0050] Fig.10 This is a defocus curve diagram of the lens in Example 2 under visible light 440nm-640nm;

[0051] Fig.11 The vertical axis chromatic aberration curve of the lens in Example 2 under visible light 530nm;

[0052] Fig.12 The axial chromatic aberration curve of the lens in Example 2 under visible light 440nm-640nm;

[0053] Fig.13 The field curvature and distortion diagram of the lens in Example 2 under visible light 440nm-640nm;

[0054] Fig.14 is a spot diagram of the lens in Example 2;

[0055] Fig.15 This is the optical path diagram of Embodiment 3;

[0056] Fig.16 This is the MTF curve of the lens in Example 3 under visible light 440nm-640nm;

[0057] Fig.17This is a defocus curve diagram of the lens in Example 3 under visible light 440nm-640nm;

[0058] Fig.18 This is a vertical axis chromatic aberration curve of the lens in Example 3 under visible light 530nm;

[0059] Fig.19 axial chromatic aberration curve of the lens in Example 3 under visible light 440nm-640nm;

[0060] Fig. 20 The field curvature and distortion diagram of the lens in Example 3 under visible light 440nm-640nm;

[0061] Fig.21 is a spot diagram of the lens in Example 3;

[0062] Fig. 22 This is the optical path diagram of Embodiment 4;

[0063] Fig.23 This is the MTF curve of the lens in Example 4 under visible light 440nm-640nm;

[0064] Fig.24 This is a defocus curve diagram of the lens in Example 4 under visible light 440nm-640nm;

[0065] Fig.25 This is a vertical axis chromatic aberration curve of the lens in Example 4 under visible light 530nm;

[0066] Fig.26 axial chromatic aberration curve of the lens in Example 4 under visible light 440nm-640nm;

[0067] Fig. 27 The field curvature and distortion diagram of the lens in Example 4 under visible light 440nm-640nm;

[0068] Fig.28 This is the spot diagram of the lens in Example 4.

[0069] Description of reference numerals:

[0070] A first lens 1 , a second lens 2 , a third lens 3 , a fourth lens 4 , a fifth lens 5 , a sixth lens 6 , a seventh lens 7 , an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , an eleventh lens 11 , an aperture 12 , and a protective glass 13 . DETAILED DESCRIPTION

[0071] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0072] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0073] In this specification, "a lens having a positive refractive power (or a negative refractive power)" means that the paraxial refractive power of the lens calculated by Gaussian optical theory is positive (or negative). The "object side (or image side) of the lens" is defined as a specific range of the lens surface through which the imaging light passes. The concave and convex shape of the lens can be judged according to the judgment method of ordinary knowledge in this field, that is, the concave and convex shape of the lens surface can be judged by the positive and negative signs of the radius of curvature (abbreviated as R value). R value can be commonly used in optical design software, such as Zemax or CodeV. R value is also commonly found in the lens data sheet (lensdatasheet) of optical design software. For the object side, when the R value is positive, the object side is judged to be convex; when the R value is negative, the object side is judged to be concave. Conversely, for the image side, when the R value is positive, the image side is judged to be concave; when the R value is negative, the image side is judged to be convex.

[0074] The present invention discloses a large image plane athermal optical imaging lens, which includes a first lens to an eleventh lens in sequence along an optical axis from an object side to an image side; each of the first lens to the eleventh lens includes an object-side surface facing the object side and allowing imaging light to pass through, and an image-side surface facing the image side and allowing imaging light to pass through;

[0075] The first lens has a positive refractive power, and the object side surface of the first lens is a convex surface, and the image side surface is a concave surface;

[0076] The second lens has a negative refractive power, and the object side surface of the second lens is a convex surface and the image side surface is a concave surface;

[0077] The third lens has a negative refractive power, and the object side surface and the image side surface of the third lens are concave;

[0078] The fourth lens has a positive refractive power, and the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface;

[0079] The fifth lens has a positive refractive power, the object side surface of the fifth lens is a convex surface, and the image side surface is a flat surface;

[0080] The sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex;

[0081] The seventh lens has a negative refractive power, and the object side surface of the seventh lens is a convex surface, and the image side surface is a concave surface;

[0082] The eighth lens has a positive refractive power, and the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface;

[0083] The ninth lens has a positive refractive power, the object side surface of the ninth lens is a flat surface, and the image side surface is a convex surface;

[0084] The tenth lens has a negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface is a convex surface;

[0085] The eleventh lens has a positive refractive power, and the object side surface and the image side surface of the eleventh lens are convex;

[0086] The optical imaging lens has only the eleven lenses having the refractive powers mentioned above.

[0087] Preferably, the image-side surface of the seventh lens and the object-side surface of the eighth lens are glued to each other and satisfy:

[0088] Vd7≤24, Vd8≥52, and |Vd8-Vd7|>28, wherein Vd7 is the dispersion coefficient of the seventh lens, and Vd8 is the dispersion coefficient of the eighth lens. The combination of high and low dispersion materials of the two lenses is conducive to correcting chromatic aberration, optimizing image quality, improving system performance, and eliminating the blue-purple edge phenomenon that is prone to occur in lens imaging.

[0089] Preferably, the image-side surface of the ninth lens and the object-side surface of the tenth lens are glued to each other and satisfy:

[0090] Vd9≥68, Vd10≤21, and |Vd9-Vd10|>47, wherein Vd9 is the dispersion coefficient of the ninth lens, and Vd10 is the dispersion coefficient of the tenth lens. The combination of high and low dispersion materials of the two lenses is conducive to correcting chromatic aberration, optimizing image quality, improving system performance, and eliminating the blue-purple edge phenomenon that is prone to occur in lens imaging.

[0091] Preferably, the lens further comprises an aperture, and the aperture is arranged between the fifth lens and the sixth lens. Of course, the aperture may also be arranged at other suitable positions.

[0092] Preferably, the refractive index temperature coefficients dn / dt of the sixth lens and the ninth lens are both negative, that is, the refractive index of the lens decreases as the temperature increases, and both lenses are positive lenses. When the external temperature changes, the sixth lens and the ninth lens use materials with negative dn / dt values, which can well offset the influence of temperature changes on the back focus of the lens, so that the lens can compensate for temperature drift, and can ensure that when the lens is used in a temperature range of -20°C to 70°C, the picture is clear and not out of focus, which can meet most of the usage environment requirements.

[0093] Preferably, the focal lengths of the first to eleventh lenses and the focal length of the entire lens satisfy the following conditions:

[0094] 4.6<|(f1 / f)|<4.8, 2.1<|(f2 / f)|<2.3, 1.2<|(f3 / f)|<1.3,

[0095] 7.3<|(f4 / f)|<9.7, 3.1<|(f5 / f)|<3.5, 2.1<|(f6 / f)|<2.4,

[0096] 1.4<|(f7 / f)|<1.6, 1.8<|(f8 / f)|<1.9, 1.2<|(f9 / f)|<1.4,

[0097] 1.2<|(f10 / f)|<1.3, 1.9<|(f11 / f)|<2,

[0098] Among them, f is the focal length of the lens, and f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, and f11 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens, respectively. By reasonably allocating the focal power, it is more conducive to improving the optical system performance of the lens.

[0099] Preferably, the lens meets the following condition: TTL<57mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, so that the total length of the lens is short, the structure is compact, and the practicality is strong.

[0100] The optical imaging lens of the present invention will be described in detail below with reference to specific embodiments.

[0101] Embodiment 1

[0102] refer to Figure 1As shown, this embodiment discloses a large image plane athermal optical imaging lens, which includes a first lens 1 to an eleventh lens 11 in sequence along an optical axis from an object side A1 to an image side A2; each of the first lens 1 to the eleventh lens 11 includes an object-side surface facing the object side A1 and allowing imaging light to pass through, and an image-side surface facing the image side A2 and allowing imaging light to pass through;

[0103] The first lens 1 has a positive refractive power, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;

[0104] The second lens 2 has a negative refractive power, and the object side surface of the second lens 2 is a convex surface, and the image side surface is a concave surface;

[0105] The third lens 3 has a negative refractive power, and the object side surface and the image side surface of the third lens 3 are concave;

[0106] The fourth lens element 4 has a positive refractive power, and the object side surface of the fourth lens element 4 is a concave surface, and the image side surface is a convex surface;

[0107] The fifth lens element 5 has a positive refractive power, and the object side surface of the fifth lens element 5 is a convex surface and the image side surface is a flat surface;

[0108] The sixth lens element 6 has a positive refractive power, and the object side surface and the image side surface of the sixth lens element 6 are convex;

[0109] The seventh lens element 7 has a negative refractive power, and the object side surface of the seventh lens element 7 is a convex surface, and the image side surface is a concave surface;

[0110] The eighth lens element 8 has a positive refractive power, and the object side surface of the eighth lens element 8 is a convex surface, and the image side surface is a concave surface;

[0111] The ninth lens element 9 has a positive refractive power, and the object side surface of the ninth lens element 9 is a flat surface, and the image side surface is a convex surface;

[0112] The tenth lens 10 has a negative refractive power, and the object side surface of the tenth lens 10 is a concave surface, and the image side surface is a convex surface;

[0113] The eleventh lens 11 has a positive refractive power, and the object side surface and the image side surface of the eleventh lens 11 are convex;

[0114] The optical imaging lens has only the eleven lenses with refractive power, the image side surface of the seventh lens 7 and the object side surface of the eighth lens 8 are glued to each other, the image side surface of the ninth lens 9 and the object side surface of the tenth lens 10 are glued to each other, the aperture 12 is arranged between the fifth lens 5 and the sixth lens 6, and the refractive index temperature coefficients dn / dt of the sixth lens 6 and the ninth lens 9 are both negative values.

[0115] The detailed optical data of this specific embodiment are shown in Table 1.

[0116] Table 1 Detailed optical data of Example 1

[0117] surface type Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length OBJ Subject surface 1002.685 Infinity 700.000 1 First lens 25.648 20.424 4.730 H-LAF10LA 1.78800 47.517 37.732 2 23.543 57.639 0.576 3 Second lens 16.503 14.373 1.050 H-ZLAF68B 1.88300 40.807 -17.978 4 12.370 7.313 3.812 5 The third lens 12.079 -150.459 1.090 H-ZLAF68B 1.88300 40.807 -9.713 6 10.096 9.208 5.078 7 The fourth lens 9.400 -28.593 3.800 TAFD55 2.00100 29.135 77.295 8 10.183 -22.344 0.595 9 Fifth lens 9.800 23.786 3.270 E-FDS1-W 1.92286 20.880 25.355 STO 9.308 Infinity 3.908 11 8.994 Infinity 3.364 12 The sixth lens 10.500 18.020 2.820 H-ZPK1A 1.61800 63.406 18.362 13 10.500 -29.235 0.100 14 Seventh lens 9.246 12.450 0.950 H-ZF52GT 1.84667 23.787 -12.081 15 The eighth lens 9.200 5.460 2.400 H-LAK53B 1.75500 52.337 14.918 16 8.500 8.533 1.159 17 The ninth lens 8.309 Infinity 2.850 H-ZPK5 1.59281 68.525 10.448 18 Tenth lens 9.200 -6.225 0.800 E-FDS1-W 1.92286 20.880 -9.863 19 9.904 -20.209 2.662 20 Eleventh lens 13.356 20.220 2.820 FDS18-W 1.94595 17.984 15.803 21 13.339 -57.572 2.470 22 Protective sheet 12.575 Infinity 2.076 H-K9L 1.51680 64.212 23 12.214 Infinity 4.591 24 Imaging surface 11.010 Infinity

[0118] In this specific embodiment, the focal length of the optical imaging lens is f=8mm; the aperture value FNO=1.8; the CRA (chief ray angle) is 3.7°, matching a 2 / 3 inch sensor, and the imaging surface size is 2 / 3 inch. The imaging surface size is The distance from the object side surface of the first lens 1 to the imaging surface on the optical axis is TTL=56.97 mm; (f1 / f)=4.72, (f2 / f)=-2.25, (f3 / f)=-1.21, (f4 / f)=9.66, (f5 / f)=3.17, (f6 / f)=2.30, (f7 / f)=-1.51, (f8 / f)=1.86, (f9 / f)=1.31, (f10 / f)=-1.23, (f11 / f)=1.98.

[0119] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 1 Please refer to the MTF curve of the lens under 440nm-640nm light. Figure 2 From the figure, we can see that when the spatial frequency of the lens reaches 111lp / mm, the full field transfer function image is still greater than 0.4, and the resolution can reach 2.8 million pixels, which ensures the imaging quality and greatly improves the overall static resolution and video resolution of the solution, greatly facilitating the development of later image optimization algorithms. For the defocus curve of the lens under 440nm-640nm light, please refer to Figure 3 , it can be seen from the figure that the lens has a small defocus under visible light. For the vertical axis chromatic aberration curve of the lens under 530nm light, please refer to Figure 4 、For the axial chromatic aberration curve of the lens under 440nm-640nm light, please refer to Figure 5 As can be seen from the figure, the field of view has small chromatic aberration, good color reproduction, and no obvious blue-purple fringing. Please refer to the field curvature and distortion diagram of the lens under 440nm-640nm light. Figure 6 , the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the image quality is high, and there is no need for post-image algorithm to correct the distortion. For the point diagram of the lens, please refer to Figure 7 ,As can be seen from the figure, the full field of view point array is less than 4um, the geometric point is <20um, the aberration is small, and the imaging quality is good.

[0120] Embodiment 2

[0121] Cooperate Figures 8 to 14As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and lens thickness are different.

[0122] The detailed optical data of this specific embodiment are shown in Table 2.

[0123] Table 2 Detailed optical data of Example 2

[0124]

[0125]

[0126] In this specific embodiment, the focal length of the optical imaging lens is f=8mm; the aperture value FNO=1.8; the CRA (chief ray angle) is 4.2°, matching a 2 / 3 inch sensor, and the imaging surface size is 2 / 3 inch. The distance from the object side surface of the first lens 1 to the imaging surface on the optical axis is TTL=56.86 mm; (f1 / f)=4.77, (f2 / f)=-2.13, (f3 / f)=-1.25, (f4 / f)=7.38, (f5 / f)=3.47, (f6 / f)=2.12, (f7 / f)=-1.43, (f8 / f)=1.84, (f9 / f)=1.30, (f10 / f)=-1.23, (f11 / f)=1.95.

[0127] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 8 Please refer to the MTF curve of the lens under 440nm-640nm light. Fig. 9 From the figure, we can see that when the spatial frequency of the lens reaches 111lp / mm, the full field transfer function image is still greater than 0.4, and the resolution can reach 2.8 million pixels, which ensures the imaging quality and greatly improves the overall static resolution and video resolution of the solution, greatly facilitating the development of later image optimization algorithms. For the defocus curve of the lens under 440nm-640nm light, please refer to Fig.10 , it can be seen from the figure that the lens has a small defocus under visible light. For the vertical axis chromatic aberration curve of the lens under 530nm light, please refer to Fig.11 、For the axial chromatic aberration curve of the lens under 440nm-640nm light, please refer to Fig.12 As can be seen from the figure, the field of view has small chromatic aberration, good color reproduction, and no obvious blue-purple fringing. Please refer to the field curvature and distortion diagram of the lens under 440nm-640nm light. Fig.13 , the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the image quality is high, and there is no need for post-image algorithm to correct the distortion. For the point diagram of the lens, please refer to Fig.14,As can be seen from the figure, the full field of view point array is less than 4um, the geometric point is <20um, the aberration is small, and the imaging quality is good.

[0128] Embodiment 3

[0129] Cooperate Figures 15 to 21 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and lens thickness are different.

[0130] The detailed optical data of this specific embodiment are shown in Table 3.

[0131] Table 3 Detailed optical data of Example 3

[0132] surface type Size (diameter) Radius of curvature thickness Material Refractive Index Dispersion coefficient focal length OBJ Subject surface 1003.284 Infinity 700.000 1 First lens 25.224 20.079 4.610 H-LAF10LA 1.78800 47.517 37.260 2 23.195 56.190 0.597 3 Second lens 16.498 14.951 1.000 H-ZLAF68B 1.88300 40.807 -17.285 4 12.377 7.345 3.987 5 The third lens 11.824 -71.752 1.440 H-ZLAF68B 1.88300 40.807 -9.741 6 10.031 9.960 4.961 7 The fourth lens 9.966 -27.384 3.670 TAFD65 2.05090 26.942 60.554 8 11.069 -20.546 0.408 9 Fifth lens 11.209 25.644 2.020 H-ZF62 1.92287 20.882 27.337 STO 10.956 Infinity 6.803 11 8.919 Infinity 1.539 12 The sixth lens 10.500 18.211 2.820 H-LAK2A 1.69211 54.570 16.944 13 10.500 -31.401 0.100 14 Seventh lens 8.938 12.602 0.970 H-ZF52GT 1.84667 23.787 -11.487 15 The eighth lens 9.200 5.337 2.390 H-LAK53B 1.75500 52.337 14.623 16 8.400 8.283 1.167 17 The ninth lens 9.200 Infinity 2.760 H-ZPK5 1.59281 68.525 10.330 18 Tenth lens 9.200 -6.155 0.800 H-ZF62 1.92287 20.882 -9.682 19 9.690 -20.296 3.411 20 Eleventh lens 13.610 21.876 2.900 FDS18-W 1.94595 17.984 15.521 21 13.619 -44.266 2.470 22 Protective sheet 12.690 Infinity 1.500 H-K9L 1.51680 64.212 23 12.387 Infinity 4.540 24 Imaging surface 11.010 Infinity

[0133] In this specific embodiment, the focal length of the optical imaging lens is f=8mm; the aperture value FNO=1.8; the CRA (chief ray angle) is 4.3°, matching a 2 / 3 inch sensor, and the imaging surface size is 2 / 3 inch. The distance from the object side surface of the first lens 1 to the imaging surface on the optical axis is TTL=56.86 mm; (f1 / f)=4.66, (f2 / f)=-2.16, (f3 / f)=-1.22, (f4 / f)=7.57, (f5 / f)=3.42, (f6 / f)=2.12, (f7 / f)=-1.44, (f8 / f)=1.83, (f9 / f)=1.29, (f10 / f)=-1.21, (f11 / f)=1.94.

[0134] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Fig.15 Please refer to the MTF curve of the lens under 440nm-640nm light. Fig.16 From the figure, we can see that when the spatial frequency of the lens reaches 111lp / mm, the full field transfer function image is still greater than 0.4, and the resolution can reach 2.8 million pixels, which ensures the imaging quality and greatly improves the overall static resolution and video resolution of the solution, greatly facilitating the development of later image optimization algorithms. For the defocus curve of the lens under 440nm-640nm light, please refer to Fig.17 , it can be seen from the figure that the lens has a small defocus under visible light. For the vertical axis chromatic aberration curve of the lens under 530nm light, please refer to Fig.18 、For the axial chromatic aberration curve of the lens under 440nm-640nm light, please refer to Fig.19 As can be seen from the figure, the field of view has small chromatic aberration, good color reproduction, and no obvious blue-purple fringing. Please refer to the field curvature and distortion diagram of the lens under 440nm-640nm light. Fig. 20, the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the image quality is high, and there is no need for post-image algorithm to correct the distortion. For the point diagram of the lens, please refer to Fig.21 ,As can be seen from the figure, the full field of view point array is less than 4um, the geometric point is <20um, the aberration is small, and the imaging quality is good.

[0135] Embodiment 4

[0136] Cooperate Figure 22 to Figure 28 As shown, the surface profile and refractive power of each lens in this embodiment and the first embodiment are substantially the same, but the optical parameters such as the curvature radius of each lens surface and lens thickness are different.

[0137] The detailed optical data of this specific embodiment are shown in Table 4.

[0138] Table 4 Detailed optical data of Example 4

[0139]

[0140]

[0141] In this specific embodiment, the focal length of the optical imaging lens is f=8mm; the aperture value FNO=1.8; the CRA (chief ray angle) is 4.3°, matching a 2 / 3 inch sensor, and the imaging surface size is 2 / 3 inch. The distance from the object side surface of the first lens 1 to the imaging surface on the optical axis is TTL=56.86 mm; (f1 / f)=4.66, (f2 / f)=-2.16, (f3 / f)=-1.22, (f4 / f)=7.57, (f5 / f)=3.42, (f6 / f)=2.12, (f7 / f)=-1.44, (f8 / f)=1.83, (f9 / f)=1.29, (f10 / f)=-1.21, (f11 / f)=1.94.

[0142] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Fig. 22 Please refer to the MTF curve of the lens under 440nm-640nm light. Fig.23 From the figure, we can see that when the spatial frequency of the lens reaches 111lp / mm, the full field transfer function image is still greater than 0.4, and the resolution can reach 2.8 million pixels, which ensures the imaging quality and greatly improves the overall static resolution and video resolution of the solution, greatly facilitating the development of later image optimization algorithms. For the defocus curve of the lens under 440nm-640nm light, please refer to Fig.24 , it can be seen from the figure that the lens has a small defocus under visible light. For the vertical axis chromatic aberration curve of the lens under 530nm light, please refer to Fig.25、For the axial chromatic aberration curve of the lens under 440nm-640nm light, please refer to Fig.26 As can be seen from the figure, the field of view has small chromatic aberration, good color reproduction, and no obvious blue-purple fringing. Please refer to the field curvature and distortion diagram of the lens under 440nm-640nm light. Fig. 27 , the optical distortion is controlled within 2.1%, it can be seen that the distortion is small, the image quality is high, and there is no need for post-image algorithm to correct the distortion. For the point diagram of the lens, please refer to Fig.28 ,As can be seen from the figure, the full field of view point array is less than 4um, the geometric point is <20um, the aberration is small, and the imaging quality is good.

[0143] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A large image plane athermal optical imaging lens, characterized in that: The optical lens includes a first lens to an eleventh lens in sequence from the object side to the image side along an optical axis; each of the first lens to the eleventh lens includes an object-side surface facing the object side and allowing imaging light to pass therethrough, and an image-side surface facing the image side and allowing imaging light to pass therethrough; The first lens has a positive refractive power, and the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; The second lens has a negative refractive power, and the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; The third lens has a negative refractive power, and the object side surface and the image side surface of the third lens are concave; The fourth lens has a positive refractive power, and the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; The fifth lens has a positive refractive power, the object side surface of the fifth lens is a convex surface, and the image side surface is a flat surface; The sixth lens has a positive refractive power, and the object side surface and the image side surface of the sixth lens are convex; The seventh lens has a negative refractive power, and the object side surface of the seventh lens is a convex surface, and the image side surface is a concave surface; The eighth lens has a positive refractive power, and the object side surface of the eighth lens is a convex surface, and the image side surface is a concave surface; The ninth lens has a positive refractive power, the object side surface of the ninth lens is a flat surface, and the image side surface is a convex surface; The tenth lens has a negative refractive power, the object side surface of the tenth lens is a concave surface, and the image side surface is a convex surface; The eleventh lens has a positive refractive power, and the object side surface and the image side surface of the eleventh lens are convex; The optical imaging lens has only the above eleven lenses with refractive power; The focal lengths of the first to eleventh lenses and the focal length of the entire lens satisfy the following conditions: 4.6<|(f1 / f)|<4.8, 2.1<|(f2 / f)|<2.3, 1.2<|(f3 / f)|<1.3, 7.3<|(f4 / f)|<9.7, 3.1<|(f5 / f)|<3.5, 2.1<|(f6 / f)|<2.4, 1.4<|(f7 / f)|<1.6, 1.8<|(f8 / f)|<1.9, 1.2<|(f9 / f)|<1.4, 1.2<|(f10 / f)|<1.3, 1.9<|(f11 / f)|<2, Among them, f is the focal length of the lens, f1, f2, f3, f4, f5, f6, f7, f8, f9, f10, and f11 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, and the eleventh lens respectively.

2. The large image plane athermal optical imaging lens according to claim 1, characterized in that: The image side surface of the seventh lens and the object side surface of the eighth lens are glued to each other and satisfy: Vd7≤24, Vd8≥52, and |Vd8-Vd7|>28, wherein Vd7 is the dispersion coefficient of the seventh lens, and Vd8 is the dispersion coefficient of the eighth lens.

3. The large image plane athermal optical imaging lens according to claim 1, characterized in that: The image side surface of the ninth lens and the object side surface of the tenth lens are glued to each other and satisfy: Vd9≥68, Vd10≤21, and |Vd9-Vd10|>47, wherein Vd9 is the dispersion coefficient of the ninth lens, and Vd10 is the dispersion coefficient of the tenth lens.

4. The large image plane athermal optical imaging lens according to claim 1, wherein: The optical system further includes a stop, which is disposed between the fifth lens and the sixth lens.

5. The large image plane athermal optical imaging lens according to claim 1, characterized in that: The refractive index temperature coefficients dn / dt of the sixth lens and the ninth lens are both negative.

6. The large image plane athermal optical imaging lens according to claim 1, wherein: The following condition is met: TTL<57 mm, wherein TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis.

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