A large-area optical lens

Abstract

The application belongs to the technical field of optical lens, and particularly relates to a large target optical lens. The application is composed of nine lenses, including first, second, third, fourth, fifth, sixth, seventh, eighth and ninth lenses arranged in sequence from the object side to the image side, wherein: the first lens is a convex-concave plastic aspheric lens with negative focal power; the second lens is a convex-concave plastic aspheric lens with positive focal power; the third lens is a convex-concave plastic aspheric lens with positive focal power; the fourth lens is a convex-concave lens with negative focal power; the fifth lens is a double-convex glass spherical lens with positive focal power; the sixth lens is a lens with negative focal power; the seventh lens is a double-convex plastic aspheric lens with positive focal power; the eighth lens is a convex-concave plastic aspheric lens with negative focal power; and the ninth lens is a convex-concave plastic aspheric lens with positive focal power. The application has the advantages of compact structure, large aperture and large target.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical lens, and particularly relates to a large target surface optical lens. BACKGROUND

[0002] In recent years, the development of the security monitoring lens technology with the security monitoring tide brings new changes for the networked camera, and the most obvious change of the lens is reflected in two aspects: high definition and large target surface, and the demand for industrial lenses is also increasing.

[0003] In the networked and digitized era, the pursuit of high definition of monitoring makes the camera have higher and higher requirements for the size of the target surface. Generally speaking, the larger the area of the photosensitive device, the better the photosensitive performance, the higher the signal-to-noise ratio, and the better the imaging effect. However, the lenses in the prior art generally have the problems of high cost, small imaging frame, large lens aperture and distortion, and unclear imaging, and cannot match the large target surface photosensitive device. However, in order to improve the picture quality, the high-definition network camera product often uses a large target surface photosensitive chip. Therefore, the research and development of high-resolution large target surface lenses are more urgent. SUMMARY

[0004] The purpose of the present application is to solve the problems of high cost, small imaging frame, large lens aperture and distortion, and unclear imaging in the prior art, and to provide a large target surface optical lens, which meets the demand of large target surface, has a lens aperture of Φ<16mm, and has the advantages of compact structure and large aperture.

[0005] In order to achieve the above purpose, the technical scheme provided by the present application is as follows:

[0006] A large target surface optical lens is composed of nine lenses, including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8 and a ninth lens L9 arranged in order from the object side to the image side, wherein:

[0007] The first lens L1 is a convex-concave plastic aspheric lens with negative focal power;

[0008] The second lens L2 is a concave-convex plastic aspheric lens with positive focal power;

[0009] The third lens L3 is a convex-concave plastic aspheric lens with positive focal power;

[0010] The fourth lens L4 is a convex-concave lens with negative focal power;

[0011] The fifth lens L5 is a double-convex glass spherical lens with positive focal power;

[0012] The sixth lens L6 is a lens with negative focal power;

[0013] The seventh lens L7 is a biconvex plastic aspherical lens with positive optical power;

[0014] The eighth lens L8 is a concave-convex plastic aspherical lens with negative optical power;

[0015] The ninth lens L9 is a convex-concave plastic aspherical lens with positive optical power;

[0016] And satisfy the following conditions:

[0017] -0.25 <f1 / f2<-0.10;

[0018] 0.50 <f2 / f3<1.90;

[0019] -1.85 <f3 / f4<-0.65;

[0020] -20.35 <f4 / f5<-3.05;

[0021] -0.65 <f5 / f6<-0.30;

[0022] -1.80 <f6 / f7<-0.55;

[0023] -1.30 <f7 / f8<-0.55;

[0024] -1.70 <f8 / f9<-0.95;

[0025] Where f1 to f9 are the focal lengths of the first lens L1 to the ninth lens L9, respectively.

[0026] Furthermore, the true half-image height IH corresponding to the maximum field of view of the large-target optical lens and the effective focal length f of the large-target optical lens satisfy: 0.8 <IH / f<1.0。

[0027] Furthermore, the total optical length (TTL) of the large-area optical lens and the true half-image height (IH) corresponding to the maximum field of view of the large-area optical lens satisfy: 4.5 <TTL / IH<5。

[0028] Furthermore, the large-target-area optical lens also satisfies the following conditions:

[0029] n d1 ]]> n d2 ]]> n d3 ]]> n d4 ]]> n d5 ]]> 1.5±10% 1.5±10% 1.6±10% 1.7±10% 1.5±10% n d6 ]]> n d7 ]]> n d8 ]]> n d9 ]]> 1.7±10% 1.5±10% 1.6±10% 1.5±10%

[0030] Where, n d1 ~ n d9 The refractive indices are, in order, those of the first lens L1 to the ninth lens L9.

[0031] Furthermore, the large-target-area optical lens also satisfies the following conditions:

[0032] v d1 ]]> v d2 ]]> v d3 ]]> v d4 ]]> v d5 ]]> 55.5±10% 55.5±10% 20.3±10% 25.0±20% 67.5±10% v d6 ]]> v d7 ]]> v d8 ]]> v d9 ]]> 22.5±10% 55.5±10% 22.5±10% 55.5±10%

[0033] Among them, v d1 ~ v d9 The Abbe numbers are, in order, those of the first lens L1 to the ninth lens L9.

[0034] Furthermore, the aperture FNO of the large target surface optical lens satisfies: 1.00≤FNO≤1.1.

[0035] Furthermore, the field of view of the large target surface optical lens satisfies the following conditions: 100°≤FOV≤105°, optical back focal length (BFL)>4.6mm, and CRA<15°.

[0036] Furthermore, the effective focal length f of the large target surface optical lens is 7.20mm~7.45mm, and the total optical length TTL < 30mm.

[0037] Furthermore, the effective aperture DM1 of the object-side surface of the first lens to the effective aperture DM9 of the object-side surface of the ninth lens satisfy the following:

[0038] 1.45 < DM1 / DM2 < 1.55;

[0039] 0.73 < DM2 / DM3 < 0.75;

[0040] 1.00 < DM3 / DM4 < 1.05;

[0041] 1.00 < DM4 / DM5 < 1.15;

[0042] 1.00 < DM5 / DM6 < 1.15;

[0043] 1.00 < DM6 / DM7 < 1.10;

[0044] 0.95 < DM7 / DM8 < 1.05;

[0045] 0.75 < DM8 / DM9 < 0.95.

[0046] Furthermore, the operating wavelength of the large target surface optical lens is 436nm~656nm, and the main wavelength is 546nm.

[0047] Compared with existing technologies, the significant advantages of this invention are as follows: This invention integrates nine lenses through precise optical design, many of which are made of plastic material. These plastic lenses serve as the main focal length adjustment elements, significantly reducing production costs. By allocating the optical power of each lens, this invention successfully achieves a compact lens structure while ensuring a wide working distance. The total length of the lens is controlled within 30mm, and the lens diameter Φ < 16mm to meet various space-constrained application scenarios. The optical distortion of this invention is less than 33% within a field of view of 104°. In terms of optical performance, this lens has a maximum aperture of f / 1.0, providing clear and sharp imaging even in low-light environments. The true half-image height (IH) corresponding to the maximum field of view is 6.5402mm, indicating that this lens has good imaging capabilities at its maximum field of view, capturing a wider field of view within the range of large-format lenses, and providing higher image resolution and quality. Attached Figure Description

[0048] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0049] Figure 2 This is the MTF diagram of Embodiment 1 of the present invention;

[0050] Figure 3 The field curvature and distortion diagrams are from Embodiment 1 of the present invention;

[0051] Figure 4 This is a color difference curve diagram of Embodiment 1 of the present invention;

[0052] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0053] Figure 6 This is the MTF diagram of Embodiment 2 of the present invention;

[0054] Figure 7 The field curvature and distortion diagrams are from Embodiment 2 of the present invention;

[0055] Figure 8 This is a color difference curve diagram of Embodiment 2 of the present invention;

[0056] Figure 9 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0057] Figure 10 This is the MTF diagram of Embodiment 3 of the present invention;

[0058] Figure 11 The field curvature and distortion diagrams are from Embodiment 3 of the present invention;

[0059] Figure 12 This is a color difference curve diagram of Embodiment 3 of the present invention;

[0060] Figure 13 This is a schematic diagram of the structure of Embodiment 4 of the present invention;

[0061] Figure 14 This is the MTF diagram of Embodiment 4 of the present invention;

[0062] Figure 15 The field curvature and distortion diagrams are from Embodiment 4 of the present invention;

[0063] Figure 16 This is the color difference curve diagram of Embodiment 4 of the present invention. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0065] like Figure 1 , Figure 5 , Figure 9 and Figure 13 As shown, the leftmost line represents only a virtual surface, not a specific structure. Between the ninth lens L9 and the image plane IMA, there is also a filter IR and a protective glass CG. The two can be arranged in any order, and the filter IR and the protective glass CG are made of the same material.

[0066] Example 1

[0067] like Figure 1 As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspherical lens with negative optical power, the second lens L2 is a convex-concave plastic aspherical lens with positive optical power, the third lens L3 is a convex-concave plastic aspherical lens with positive optical power, the fourth lens L4 is a convex-concave glass spherical lens with negative optical power, the fifth lens L5 is a biconvex glass spherical lens with positive optical power, the sixth lens L6 is a biconcave plastic aspherical lens with negative optical power, the seventh lens L7 is a biconvex plastic aspherical lens with positive optical power, the eighth lens L8 is a convex-concave plastic aspherical lens with negative optical power, and the ninth lens L9 is a convex-concave plastic aspherical lens with positive optical power. The half-apertures of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are 6.91mm, 4.73mm, 6.44mm, 6.22mm, 5.60mm, 5.29mm, 4.97mm, 4.95mm, and 6.01mm, respectively.

[0068] The optical parameters of each lens in this embodiment are shown in Table 1, and the aspherical coefficients are shown in Table 2. The aspherical coefficients include the conic conic coefficient k and the higher-order coefficients A.i .

[0069] Table 1

[0070] Lens Object side mirror radius of curvature (mm) Image side mirror radius of curvature (mm) Lens thickness (mm) Air separation (mm) Refractive index Abbe number Material L1 6.901 3.667 1.108 5.063 1.535 55.711 K26R L2 -4.114 -5.027 2.301 -2.104 1.535 55.711 K26R STO 2.204 L3 8.911 10.936 2.242 0.065 1.661 20.373 EP8000 L4 10.018 6.884 0.800 0.000 1.805 25.456 H-ZF7LA L5 6.884 -12.748 5.411 0.100 1.592 68.342 H-ZPK5 L6 -10.115 -36.718 0.800 0.050 1.635 23.971 EP5000 L7 20.011 -25.877 2.245 0.665 1.535 55.711 K26R L8 -3.157 -5.224 1.00 0.100 1.635 23.971 EP5000 L9 4.916 12.334 2.528 2.677 1.535 55.711 K26R IR+CG - - 0.8 2.137 1.516 64.212 -

[0071] Table 2

[0072] k [A2] [A3] [A4] [A5] [A6] [A7] [A8] L1S1 -2.52 -2.775E-03 1.18E-04 -3.17E-06 5.56E-08 -6.21E-10 3.15E-12 8.27E-16 L1S2 -0.75 -4.338E-03 1.84E-04 -8.1E-06 3.88E-07 -1.65E-08 4.81E-10 -5.17E-12 L2S1 -2.07 -7.886E-04 -3.91E-05 5.91E-06 -3.69E-07 1.41E-08 -3.21E-10 3.31E-12 L2S2 -2.11 6.704E-04 -9.45E-05 7.55E-06 -4.04E-07 1.41E-08 -2.95E-10 2.76E-12 L3S1 -0.56 -1.48E-03 6.98E-05 -2.51E-06 7.78E-08 -1.08E-09 2.98E-11 -2.04E-13 L3S2 -27.38 -1.05E-03 5.46E-05 -2.54E-06 1.05E-07 -3.11E-09 5.27E-11 -3.67E-13 L6S1 -0.59 7.55E-04 -2.35E-05 1.46E-06 -1.24E-07 4.47E-09 -5.91E-11 0.00E+00 L6S2 0.00 3.444E-03 -3.22E-04 2.82E-05 -1.61E-06 4.99E-08 -7.24E-10 2.98E-12 L7S1 2.31 1.65E-03 -2.51E-04 1.89E-05 -8.13E-07 4.84E-09 6.64E-10 -1.41E-11 L7S2 21.51 -2.17E-03 3.85E-04 -3.81E-05 1.96E-06 -5.85E-08 9.62E-10 -6.64E-12 L8S1 -5.31 5.34E-04 2.05E-04 -2.92E-05 2.35E-06 -1.06E-07 2.51E-09 -2.41E-11 L8S2 -9.94 -7.77E-04 3.71E-04 -4.51E-05 3.64E-06 -1.61E-07 3.57E-09 -3.19E-11 L9S1 -7.91 -5.37E-04 2.28E-05 -2.76E-06 2.15E-07 -8.08E-09 1.56E-10 -1.21E12 L9S2 -5.93 -1.71E-03 9.85E-05 -7.67E-06 3.95E-7 -1.18E-08 2.12E-10 -1.55E-12

[0073] Figure 2 This is the MTF chart of the lens shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the chart, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and resolution at both low and high frequencies. Figure 3 The image shows the field curvature and distortion of the lens. The optical distortion is less than 30% within a field of view of 104°. Figure 4 The diagram shows the chromatic aberration curve of the lens. The chromatic aberration between long and short wavelengths is within 6µm, and the true half-image height (IH) corresponding to the maximum field of view is 6.5402mm. Based on the above data, the effective focal length f of the lens in this embodiment is 7.3mm, and the entrance pupil diameter D is 6.89mm. The ratio of the true half-image height (IH) corresponding to the maximum field of view to the effective focal length f is 0.89. The ratio of the total optical length (TTL) to the true half-image height (IH) corresponding to the maximum field of view is 4.57. The lens incorporates two glass spherical lenses and seven plastic aspherical lenses. The fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group. The plastic aspherical lenses effectively distribute the optical power, thereby improving the image quality of the lens. This results in a compact overall structure with a total optical length (TTL) of less than 30mm, effectively saving assembly space and further miniaturizing the lens. Furthermore, the aperture FNO is 1.06, which meets the requirement for clear imaging in low light.

[0074] Example 2:

[0075] like Figure 5As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspherical lens with negative optical power, the second lens L2 is a convex-concave plastic aspherical lens with positive optical power, the third lens L3 is a convex-concave plastic aspherical lens with positive optical power, the fourth lens L4 is a convex-concave plastic aspherical lens with negative optical power, the fifth lens L5 is a biconvex glass spherical lens with positive optical power, the sixth lens L6 is a convex-concave glass spherical lens with negative optical power, the seventh lens L7 is a biconvex plastic aspherical lens with positive optical power, the eighth lens L8 is a convex-concave plastic aspherical lens with negative optical power, and the ninth lens L9 is a convex-concave plastic aspherical lens with positive optical power. The half-apertures of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are 6.91mm, 4.73mm, 6.44mm, 6.22mm, 5.60mm, 5.29mm, 4.97mm, 4.95mm, and 6.01mm, respectively.

[0076] Specifically, the optical parameters of each lens are shown in Table 3 below, and the aspherical coefficients are shown in Table 4. The aspherical coefficients include the conic conic coefficient k and the higher-order coefficients A. i .

[0077] Table 3

[0078] Lens Object side mirror radius of curvature (mm) Image side mirror radius of curvature (mm) Lens thickness (mm) Air separation (mm) Refractive index Abbe number Material L1 8.725 3.952 1.120 4.671 1.535 55.711 K26R L2 -4.063 -4.366 1.731 -1.556 1.536 55.981 T62R STO 1.656 L3 8.529 8.336 3.332 0.344 1.661 20.373 EP8000 L4 9.574 8.457 1.005 0.315 1.661 20.373 EP8000 L5 9.658 -7.807 5.703 0.00 1.593 68.342 H-ZPK5 L6 -7.807 -13.153 0.805 0.080 1.847 23.971 H-ZF52A L7 13.440 -185.915 2.192 0.685 1.536 55.981 T62R L8 -3.911 -5.661 1.070 0.105 1.661 20.373 EP8000 L9 4.115 5.233 1.688 3.255 1.536 55.981 T62R IR+CG - - 0.800 2.144 1.516 64.212 -

[0079] Table 4

[0080] k [A2] [A3] [A4] [A5] [A6] [A7] [A8] L1S1 -1.62 -2.33E-03 1.05E-04 -3.28E-06 7.36E-08 -1.08E-09 9.25E-12 -3.33E-14 L1S2 -0.65 -3.05E-03 1.20E-04 -3.12E-06 -1.55E-08 5.57E-09 -2.20E-10 3.40E-12 L2S1 -4.01 -1.49E-03 8.19E-05 -1.49E-06 -4.79E-08 3.63E-09 -1.03E-10 1.22E-12 L2S2 -2.66 9.69E-04 -1.09E-04 1.19E-06 -7.63E-07 3.08E-08 -7.25E-10 7.45E-12 L3S1 -0.79 -1.91E-03 1.31E-04 -7.05E-05 2.83E-07 -7.84E-09 1.24E-10 -7.94E-13 L3S2 -19.18 -2.18E-03 1.12E-04 -3.41E-06 5.17E-08 -7.52E-10 1.81E-11 -1.70E-13 L4S1 -3.36 -2.64E-04 -5.82E-05 5.38E-06 -2.42E-07 5.41E-09 -4.58E-11 0.00E+00 L4S2 -0.40 9.78E-04 -1.28E-04 6.63E-06 -2.02E-07 3.49E-09 -2.45E-11 0.00E+00 L7S1 3.98 -8.15E-04 1.06E-05 -1.74E-06 1.08E-07 -7.24E-09 2.27E-10 -2.50E-12 L7S2 -85.13 -1.32E-03 -1.66E-05 1.13E-05 -1.09E-06 4.65E-08 -9.62E-10 8.01E-12 L8S1 -8.65 1.63E-04 8.53E-05 -4.92E-06 1.69E-07 -3.99E-09 6.26E-11 -6.84E-13 L8S2 -14.11 -7.25E-04 3.04E-04 -2.86E-05 1.70E-06 -5.67E-08 9.68E-10 -6.81E-12 L9S1 -5.27 -3.6E-04 -2.99E-05 -2.96E-06 3.39E-07 -1.25E-08 2.21E-10 -1.59E12 L9S2 -7.61 7.30E-04 -1.44E-04 5.42E-06 -7.21E-08 -1.35E-09 5.67E-11 -5.55E-13

[0081] Figure 6 This is the MTF chart of the lens shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the chart, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and resolution at both low and high frequencies. Figure 7 The image shows the field curvature and distortion of the lens. Within a field of view of 104°, the optical distortion is less than 31%. Figure 8The diagram shows the chromatic aberration curve of the lens. The chromatic aberration between long and short wavelengths is within 9µm, and the true half-image height (IH) corresponding to the maximum field of view is 6.5402mm. Based on the above data, the effective focal length f of the lens in this embodiment is 7.3mm, and the entrance pupil diameter D is 6.84mm. The ratio of the true half-image height (IH) corresponding to the maximum field of view to the effective focal length (IH / f) is 0.9. The ratio of the total optical length (TTL) to the true half-image height (IH) corresponding to the maximum field of view (TTL / IH) is 4.91. The lens incorporates two glass spherical lenses and seven plastic aspherical lenses. The fifth lens L5 and the sixth lens L6 are cemented together to form the first cemented lens group. The plastic aspherical lenses effectively distribute the optical power, thereby improving the image quality of the lens. This results in a compact overall structure with a total optical length (TTL) of less than 30mm, effectively saving assembly space and further miniaturizing the lens. Furthermore, the aperture FNO is 1.06, which meets the requirement for clear imaging in low light.

[0082] Example 3:

[0083] like Figure 9 As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspherical lens with negative optical power, the second lens L2 is a convex-concave plastic aspherical lens with positive optical power, the third lens L3 is a convex-concave plastic aspherical lens with positive optical power, the fourth lens L4 is a convex-concave plastic aspherical lens with negative optical power, the fifth lens L5 is a biconvex glass spherical lens with positive optical power, the sixth lens L6 is a convex-concave glass spherical lens with negative optical power, the sixth lens L7 is a biconvex plastic aspherical lens with positive optical power, the eighth lens L8 is a convex-concave plastic aspherical lens with negative optical power, and the ninth lens L9 is a convex-concave plastic aspherical lens with positive optical power. The half-apertures of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are 6.91mm, 4.73mm, 6.44mm, 6.22mm, 5.60mm, 5.29mm, 4.97mm, 4.95mm, and 6.01mm, respectively.

[0084] Specifically, the optical parameters of each lens are shown in Table 5 below, and the aspherical coefficients are shown in Table 6. The aspherical coefficients include the conic conic coefficient k and the higher-order coefficients A. i .

[0085] Table 5

[0086] Lens Object side mirror radius of curvature (mm) Image side mirror radius of curvature (mm) Lens thickness (mm) Air separation (mm) Refractive index Abbe number Material L1 6.38 3.41 1.30 5.18 1.535 55.711 K26R L2 -4.26 -4.64 2.49 -0.53 1.536 55.981 T62R STO 0.63 L3 9.18 11.41 2.12 0.09 1.661 20.373 EP8000 L4 10.50 6.88 0.81 0.00 1.785 25.720 H-ZF13 L5 6.88 -15.82 5.08 0.19 1.593 68.342 H-ZPK5 L6 -58.32 28.78 1.05 0.52 1.661 20.373 EP8000 L7 18.16 -15.69 2.45 0.46 1.536 55.981 T62R L8 -3.45 -5.79 1.05 0.11 1.639 23.290 SP3801 L9 4.54 8.01 2.34 1.93 1.536 55.981 T62R IR+CG - - 0.800 1.516 64.212 -

[0087] Table 6

[0088] k [A2] [A3] [A4] [A5] [A6] [A7] [A8] L1S1 -1.53 -1.75E-03 2.87E-05 1.83E-07 -2.17E-08 5.34E-10 -6.82E-12 3.43E-14 L1S2 -0.73 -2.68E-03 2.11E-05 1.99E-06 -2.47E-07 1.41E-08 -4.41E-10 5.75E-12 L2S1 -3.44 -1.42E-03 4.97E-05 -2.27E-06 1.39E-07 -6.01E-09 1.57E-10 -1.84E-12 L2S2 -2.59 -2.80E-05 -3.38E-05 3.39E-06 -1.79E-07 6.41E-09 -1.31E-10 1.13E-12 L3S1 -0.02 -1.56E-03 7.04E-05 -2.78E-06 9.52E-08 -2.17E-09 2.87E-11 -1.64E-13 L3S2 -29.79 -1.06E-03 6.31E-05 -2.92E-06 1.22E-07 -3.15E-09 4.78E-11 -3.12E-13 L6S1 80.77 1.41E-04 -2.61E-05 3.23E-07 1.17E-07 -8.97E-09 2.64E-10 -2.97E-12 L6S2 4.63 1.35E-03 -2.85E-05 -6.92E-06 9.13E-07 -4.91E-08 1.25E-09 -1.26E-11 L7S1 -4.39 1.41E-04 3.14E-05 -1.22E-05 1.11E-06 -5.14E-08 1.17E-09 -9.76E-12 L7S2 4.86 -6.99E-04 -3.33E-05 1.61E-05 -1.81E-06 9.49E-08 -2.46E-09 2.57E-11 L8S1 -7.15 7.63E-04 -3.91E-05 1.45E-05 -1.54E-06 7.67E-08 -1.88E-09 1.80E-11 L8S2 -16.04 -9.48E-04 2.81E-04 -2.03E-05 9.63E-07 -2.43E-08 2.11E-10 6.61E-13 L9S1 -6.15 -1.47E-03 1.09E-04 -8.32E-06 4.34E-07 -1.25E-08 1.78E-10 -1.07E12 L9S2 -9.73 -5.01E-04 -2.13E-05 5.31E-07 9.83E-09 -7.51E-10 1.81E-11 -1.72E-13

[0089] Figure 10This is the MTF chart of the lens shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the chart, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and resolution at both low and high frequencies. Figure 11 The image shows the field curvature and distortion of the lens. Within a field of view of 104°, the optical distortion is less than 32%. Figure 12 The diagram shows the chromatic aberration curve of the lens. The chromatic aberration between long and short wavelengths is within 7µm, and the true half-image height (IH) corresponding to the maximum field of view is 6.5402mm. Based on the above data, the effective focal length f of the lens in this embodiment is 7.3mm, and the entrance pupil diameter D is 6.93mm. The ratio of the true half-image height (IH) corresponding to the maximum field of view to the effective focal length f is 0.89. The ratio of the total optical length (TTL) to the true half-image height (IH) corresponding to the maximum field of view is 4.6. The lens incorporates two glass spherical lenses and seven plastic aspherical lenses. The fourth lens L4 and the fifth lens L5 are cemented together to form the first cemented lens group. The plastic aspherical lenses effectively distribute the optical power, thereby improving the image quality of the lens. This results in a compact overall structure with a total optical length (TTL) of less than 30mm, effectively saving assembly space and further miniaturizing the lens. Furthermore, the aperture FNO is 1.06, which meets the requirement for clear imaging in low light.

[0090] Example 4:

[0091] like Figure 13 As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspherical lens with negative optical power, the second lens L2 is a convex-concave plastic aspherical lens with positive optical power, the third lens L3 is a convex-concave plastic aspherical lens with positive optical power, the fourth lens L4 is a convex-concave plastic aspherical lens with negative optical power, the fifth lens L5 is a biconvex glass spherical lens with positive optical power, the sixth lens L6 is a convex-concave glass spherical lens with negative optical power, the sixth lens L7 is a biconvex plastic aspherical lens with positive optical power, the eighth lens L8 is a convex-concave plastic aspherical lens with negative optical power, and the ninth lens L9 is a convex-concave plastic aspherical lens with positive optical power. The half-apertures of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 are 6.91mm, 4.73mm, 6.44mm, 6.22mm, 5.60mm, 5.29mm, 4.97mm, 4.95mm, and 6.01mm, respectively.

[0092] Specifically, the optical parameters of each lens are shown in Table 7 below, and the aspherical coefficients are shown in Table 8. The aspherical coefficients include the conic conic coefficient k and the higher-order coefficients A. i .

[0093] Table 7

[0094] Lens Object side mirror radius of curvature (mm) Image side mirror radius of curvature (mm) Lens thickness (mm) Air separation (mm) Refractive index Abbe number Material L1 6.69 3.29 1.11 4.76 1.535 55.711 K26R L2 -4.21 -4.41 2.09 -1.99 1.535 55.711 K26R STO 2.10 L3 9.20 9.61 2.15 0.1 1.661 20.373 EP8000 L4 9.62 8.22 0.80 0.00 1.728 28.319 H-ZF4A L5 8.22 -7.34 6.39 0.00 1.603 65.460 H-ZPK2A L6 -7.34 -27.48 0.8 0.08 1.847 23.79 H-ZF52A L7 12.21 -235.13 1.94 0.65 1.535 55.711 K26R L8 -4.04 -5.32 1.01 0.11 1.636 23.972 EP5000 L9 4.59 6.33 1.97 3.05 1.535 55.711 K26R IR+CG - - 0.800 2.14 1.516 64.212 -

[0095] Table 8

[0096] k [A2] [A3] [A4] [A5] [A6] [A7] [A8] L1S1 -2.41 -3.28E-03 1.46E-04 -4.3E-06 8.61E-08 -1.05E-09 6.48E-12 -9.95E-15 L1S2 -0.76 -5.02E-03 2.21E-04 -8.92E-06 2.67E-07 -3.73E-09 -6.74E-11 2.89E-12 L2S1 -3.08 -4.55E-04 -7.13E-05 9.17E-06 -6.01E-07 2.46E-08 -5.82E-10 5.81E-12 L2S2 -2.16 8.28E-04 -1.16E-04 1.01E-05 -5.57E-07 2.05E-08 -4.42E-10 4.12E-12 L3S1 -0.48 -1.63E-03 8.55E-05 -3.24E-06 9.66E-08 -2.08E-09 2.75E-11 -1.62E-13 L3S2 -23.75 -8.19E-04 4.55E-05 -1.95E-06 7.16E-08 -1.85E-09 2.72E-11 -1.71E-13 L7S1 3.19 -1.11E-03 3.17E-05 -4.21E-06 3.34E-07 -1.99E-08 5.84E-10 -6.42E-12 L7S2 0.00 -1.01E-03 8.88E-05 -1.16E-05 6.62E-07 -2.14E-08 3.92E-10 -3.19E-12 L8S1 -8.16 1.64E-03 -7.86E-05 3.91E-06 7.75E-08 -1.50E-08 5.09E-10 -5.95E-12 L8S2 -10.17 9.59E-05 1.67E-04 -1.59E-05 1.37E-06 -6.34E-08 1.38E-09 -1.17E-11 L9S1 -6.12 -7.01E-04 1.91E-05 -2.88E-06 2.38E-07 -8.83E-09 1.63E-10 -1.26E-12 L9S2 -10.51 -1.25E-04 -4.98E-05 1.16E-06 4.61E-08 -3.58E-09 8.76E-11 -7.81E-13

[0097] Figure 14 This is the MTF chart of the lens shown, which represents the lens imaging modulation at different spatial frequencies in various fields of view. The horizontal axis represents spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. As can be seen from the chart, the MTF curve decreases smoothly and evenly from the center to the edge of the field of view, indicating good imaging quality and resolution at both low and high frequencies. Figure 15 The image shows the field curvature and distortion of the lens. Within a field of view of 104°, the optical distortion is less than 33%. Figure 16 The diagram shows the chromatic aberration curve of the lens. The chromatic aberration between long and short wavelengths is within 9µm, and the true half-image height (IH) corresponding to the maximum field of view is 6.5402mm. Based on the above data, the effective focal length f of the lens in this embodiment is 7.4mm, and the entrance pupil diameter D is 6.99mm. The ratio of the true half-image height (IH) corresponding to the maximum field of view to the effective focal length f is 0.88. The ratio of the total optical length (TTL) to the true half-image height (IH) corresponding to the maximum field of view is 4.59. The lens uses three glass spherical lenses and six plastic aspherical lenses. The fourth lens L4, the fifth lens L5, and the sixth lens L6 are cemented together to form the first cemented lens group. The plastic aspherical lenses effectively distribute the optical power, thereby improving the image quality of the lens. This results in a compact overall structure with a total optical length (TTL) of less than 30mm, effectively saving assembly space and making it more miniaturized. Furthermore, the aperture FNO is 1.07, which meets the requirement of clear imaging in low light.

[0098] The embodiments described above are merely illustrative of one or more implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the appended claims.

Claims

1. A large target surface optical lens characterized in that, The large-aperture optical lens comprises, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. Optical parameters of each lens in the large-aperture optical lens are as follows: 。 2. A large target surface optical lens characterized by, The large-aperture optical lens comprises, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. Optical parameters of each lens in the large-aperture optical lens are as follows: 。 3. A large target surface optical lens characterized by, The large-aperture optical lens comprises, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. Optical parameters of each lens in the large-aperture optical lens are as follows: 。 4. A large target surface optical lens characterized by, The large-aperture optical lens comprises, in sequence from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a ninth lens L9. Optical parameters of each lens in the large-aperture optical lens are as follows: 。 5. The large target format optical lens of claim 1, wherein, The aperture FNO of the large-aperture optical lens is 1.

06.

6. The large target format optical lens of claim 2, wherein, The aperture FNO of the large-aperture optical lens is 1.

06.

7. The large target format optical lens of claim 3, wherein, The aperture FNO of the large-aperture optical lens is 1.

06.

8. The large target format optical lens of claim 4, wherein, The aperture FNO of the large-aperture optical lens is 1.

07.

9. The large target format optical lens according to any one of claims 1-4, wherein, The working waveband of the large-aperture optical lens is 436nm-656nm, and the main wavelength is 546nm.

Images