Large-target-surface optical lens

Abstract

The utility model belongs to the technical field of optical lenses, and particularly relates to a large-target-surface optical lens. The optical imaging system is composed of nine lenses and comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged from the object side to the image side, and the first lens is a convex-concave plastic aspheric lens with negative focal power; the second lens is a concave-convex 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 biconvex glass spherical lens with positive focal power; the sixth lens is a lens with negative focal power; the seventh lens is a biconvex plastic aspheric lens with positive focal power; the eighth lens is a concave-convex plastic aspheric lens with negative focal power; and the ninth lens is a convex-concave plastic aspheric lens with positive focal power. The utility model has the advantages of compact structure, large aperture and large target surface.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical lenses, and in particular relates to an optical lens with a large target surface. Background Art

[0002] In recent years, with the development of the security trend, surveillance lens technology has brought new changes to the networking of cameras. The most obvious changes in lenses are reflected in two aspects: high definition and large target area. The demand for industrial lenses is also increasing.

[0003] In the era of networking and digitalization, the pursuit of high-definition monitoring has led to higher and higher requirements for the size of the target surface of the camera. Generally speaking, the larger the area of ​​the photosensitive device, the better the photosensitivity, the higher the signal-to-noise ratio, and the better the imaging effect. However, the lenses in the existing technology generally have the problems of high cost, small imaging frame, large lens diameter, distortion and unclear imaging, and cannot match large target surface photoreceptors. However, in order to improve the picture quality, high-definition network camera products often use large target surface photosensitive chips. Therefore, the research and development of high-resolution large target surface lenses is more urgent. Utility Model Content

[0004] The utility model aims to solve the problems of high cost, small imaging frame, large lens diameter, large distortion and unclear imaging in the prior art, and proposes a large target surface optical lens, which meets the requirements of large target surface and has a lens diameter of It has the advantages of compact structure and large aperture.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is:

[0006] An optical lens with a large target surface 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, which are arranged in sequence from the object side to the image side, wherein:

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

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

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

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

[0011] The fifth lens L5 is a biconvex glass spherical lens with positive power;

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

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

[0016] And meet 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] Among them, f1-f9 are the focal lengths of the first lens L1 to the ninth lens L9 respectively.

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

[0027] Furthermore, the total optical length TTL of the large-surface optical lens and the real half-image height IH corresponding to the maximum field angle of the large-surface optical lens satisfy the following conditions: 4.5 <TTL / IH<5。

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

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

[0030] Among them, n d1 ~n d9 are the refractive indices of the first lens L1 to the ninth lens L9 in sequence.

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

[0032]

[0033]

[0034] Among them, v d1 ~v d9 are the Abbe numbers of the first lens L1 to the ninth lens L9 in sequence.

[0035] Furthermore, the aperture FNO of the large target surface optical lens satisfies: 1.00≤FNO≤1.1.

[0036] Furthermore, the field of view angle of the large target optical lens satisfies: 100°≤FOV≤105°, optical back focus BFL>4.6mm, CRA<15°.

[0037] Furthermore, the effective focal length f of the large target optical lens is 7.20 mm to 7.45 mm, and the total optical length TTL is less than 30 mm.

[0038] Furthermore, the object side effective diameter DM1 of the first lens to the object side effective diameter DM9 of the ninth lens satisfy:

[0039] 1.45<DM1 / DM2<1.55;

[0040] 0.73<DM2 / DM3<0.75;

[0041] 1.00<DM3 / DM4<1.05;

[0042] 1.00<DM4 / DM5<1.15;

[0043] 1.00<DM5 / DM6<1.15;

[0044] 1.00<DM6 / DM7<1.10;

[0045] 0.95<DM7 / DM8<1.05;

[0046] 0.75<DM8 / DM9<0.95.

[0047] Furthermore, the operating wavelength band of the large target optical lens is 436nm to 656nm, and the main wavelength is 546nm.

[0048] Compared with the prior art, the utility model has the following significant advantages: the utility model integrates nine lenses through precise optical design, many of which are made of plastic materials. The multiple plastic lenses serve as the main focal length adjustment elements, which significantly reduces the production cost. By allocating the focal length of each lens, the utility model successfully achieves a compact lens structure while ensuring a wide range of working distances. The total length of the lens is controlled within 30mm, and the lens diameter is To meet various application scenarios with space restrictions. The optical distortion of the utility model is less than 33% within a field of view of 104°. In terms of optical performance, the maximum aperture of this lens can reach 1.0, which can provide clear and sharp imaging effects even in low-light environments. The real half-image height IH corresponding to the maximum field of view of this lens is 6.5402mm, indicating that the lens has good imaging capabilities at the maximum field of view, and can capture a larger field of view in the range of large-target lenses, providing higher image resolution and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0050] Figure 2 This is the MTF diagram of Example 1 of the utility model;

[0051] Figure 3 The field curvature and distortion diagram of Example 1 of the utility model;

[0052] Figure 4 The color difference curve diagram of Example 1 of the utility model;

[0053] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present utility model;

[0054] Figure 6 This is the MTF diagram of Example 2 of the utility model;

[0055] Figure 7 This is a field curvature and distortion diagram of Example 2 of the utility model;

[0056] Figure 8 This is a color difference curve diagram of Example 2 of the utility model;

[0057] Fig. 9 This is a schematic diagram of the structure of Embodiment 3 of the present utility model;

[0058] Fig.10 This is the MTF diagram of Example 3 of the utility model;

[0059] Fig.11 The field curvature and distortion diagram of Example 3 of the present utility model;

[0060] Fig.12This is a color difference curve diagram of Example 3 of the utility model;

[0061] Fig.13 This is a schematic diagram of the structure of Embodiment 4 of the present utility model;

[0062] Fig.14 This is the MTF diagram of Example 4 of the utility model;

[0063] Fig.15 The field curvature and distortion diagram of Example 4 of the utility model;

[0064] Fig.16 This is a color difference curve diagram of Example 4 of the utility model. DETAILED DESCRIPTION

[0065] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0066] like Figure 1 , Figure 5 , Fig. 9 and Fig.13 As shown, the leftmost line only represents a virtual surface, not a specific structure. A filter IR and a protective glass CG are also provided between the ninth lens L9 and the image plane IMA. The two can be arranged in any order, and the filter IR and the protective glass CG are made of the same material.

[0067] Example 1

[0068] like Figure 1 As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspheric lens with negative power, the second lens L2 is a concave-convex plastic aspheric lens with positive power, the third lens L3 is a convex-concave plastic aspheric lens with positive power, the fourth lens L4 is a convex-concave glass spherical lens with negative power, the fifth lens L5 is a biconvex glass spherical lens with positive power, the sixth lens L6 is a biconcave plastic aspheric lens with negative power, the seventh lens L7 is a biconvex plastic aspheric lens with positive power, the eighth lens L8 is a concave-convex plastic aspheric lens with negative power, and the ninth lens L9 is a convex-concave plastic aspheric lens with positive 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 6.91 mm, 4.73 mm, 6.44 mm, 6.22 mm, 5.60 mm, 5.29 mm, 4.97 mm, 4.95 mm and 6.01 mm respectively.

[0069] The optical parameters of each lens in this embodiment are shown in Table 1, and the aspheric coefficients are shown in Table 2. The aspheric coefficients include the conic quadratic coefficient k, the high-order coefficient A i .

[0070] Table 1

[0071]

[0072] Table 2

[0073]

[0074]

[0075] Figure 2 The MTF graph of the lens shown in the figure shows 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 curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good resolution in both low-frequency and high-frequency conditions. Figure 3 The figure 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 It is the chromatic aberration curve of the lens shown. The chromatic aberration of long wave and short wave is within 6um, and the real half image height IH corresponding to the maximum field angle is 6.5402mm. According to 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 real half image height IH corresponding to the maximum field angle and the effective focal length f, IH / f is 0.89. The total optical length TTL and the real half image height IH corresponding to the maximum field angle, TTL / IH is 4.57. The lens samples two glass spherical lenses and seven plastic aspherical lenses. The fourth lens L4 and the fifth lens L5 are glued to form the first glued lens group. The plastic aspherical lens effectively distributes the focal length to improve the imaging quality of the lens, making the overall structure compact, the total optical length TTL is less than 30mm, effectively saving assembly space, and more miniaturized. And the aperture FNO is 1.06, which meets the requirements of clear imaging in weak light.

[0076] Embodiment 2:

[0077] like Figure 5As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspheric lens with negative power, the second lens L2 is a concave-convex plastic aspheric lens with positive power, the third lens L3 is a convex-concave plastic aspheric lens with positive power, the fourth lens L4 is a convex-concave plastic aspheric lens with negative power, the fifth lens L5 is a biconvex glass spherical lens with positive power, the sixth lens L6 is a concave-convex glass spherical lens with negative power, the seventh lens L7 is a biconvex plastic aspheric lens with positive power, the eighth lens L8 is a concave-convex plastic aspheric lens with negative power, and the ninth lens L9 is a convex-concave plastic aspheric lens with positive 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 6.91 mm, 4.73 mm, 6.44 mm, 6.22 mm, 5.60 mm, 5.29 mm, 4.97 mm, 4.95 mm and 6.01 mm respectively.

[0078] Specifically, the optical parameters of each lens are shown in Table 3 below, and the aspheric coefficients are shown in Table 4. The aspheric coefficients include the conic quadratic coefficient k, the high-order coefficient A i .

[0079] Table 3

[0080]

[0081] Table 4

[0082] k <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[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

[0083] Figure 6 The MTF graph of the lens shown in the figure shows 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 curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good resolution in both low-frequency and high-frequency conditions. Figure 7 The figure shows the field curvature and distortion of the lens. The optical distortion is less than 31% within a field of view of 104°. Figure 8It is the chromatic aberration curve of the lens shown. The chromatic aberration of long wave and short wave is within 9um, and the real half-image height IH corresponding to the maximum field of view angle is 6.5402mm. According to 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 real half-image height IH corresponding to the maximum field of view angle and the effective focal length, IH / f is 0.9. The total optical length TTL and the real half-image height IH corresponding to the maximum field of view angle, TTL / IH is 4.91. The lens samples two glass spherical lenses and seven plastic aspherical lenses. The fifth lens L5 and the sixth lens L6 are glued to form the first glued lens group. The plastic aspherical lens effectively distributes the focal length to improve the imaging quality of the lens, making the overall structure compact, the total optical length TTL is less than 30mm, effectively saving assembly space, and more miniaturized. And the aperture FNO is 1.06, which meets the requirements of clear imaging in weak light.

[0084] Embodiment 3:

[0085] like Fig. 9 As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspheric lens with negative power, the second lens L2 is a concave-convex plastic aspheric lens with positive power, the third lens L3 is a convex-concave plastic aspheric lens with positive power, the fourth lens L4 is a convex-concave plastic aspheric lens with negative power, the fifth lens L5 is a biconvex glass spherical lens with positive power, the sixth lens L6 is a convex-concave glass spherical lens with negative power, the sixth lens L7 is a biconvex plastic aspheric lens with positive power, the eighth lens L8 is a concave-convex plastic aspheric lens with negative power, and the ninth lens L9 is a convex-concave plastic aspheric lens with positive 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 6.91 mm, 4.73 mm, 6.44 mm, 6.22 mm, 5.60 mm, 5.29 mm, 4.97 mm, 4.95 mm and 6.01 mm respectively.

[0086] Specifically, the optical parameters of each lens are shown in Table 5 below, and the aspheric coefficients are shown in Table 6. The aspheric coefficients include the conic quadratic coefficient k, the high-order coefficient A i .

[0087] Table 5

[0088]

[0089]

[0090] Table 6

[0091] k <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[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

[0092] Fig.10 The MTF graph of the lens shown in the figure shows 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 curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good resolution in both low-frequency and high-frequency conditions. Fig.11 The figure shows the field curvature and distortion of the lens. The optical distortion is less than 32% within a field of view of 104°. Fig.12 It is the chromatic aberration curve of the lens shown. The chromatic aberration of long wave and short wave is within 7um, and the real half image height IH corresponding to the maximum field angle is 6.5402mm. According to 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 real half image height IH corresponding to the maximum field angle and the effective focal length f, IH / f is 0.89. The total optical length TTL and the real half image height IH corresponding to the maximum field angle, TTL / IH is 4.6. The lens samples two glass spherical lenses and seven plastic aspherical lenses. The fourth lens L4 and the fifth lens L5 are glued to form the first glued lens group. The plastic aspherical lens effectively distributes the focal length to improve the imaging quality of the lens, making the overall structure compact, the total optical length TTL is less than 30mm, effectively saving assembly space, and more miniaturized. And the aperture FNO is 1.06, which meets the requirements of clear imaging in weak light.

[0093] Embodiment 4:

[0094] like Fig.13 As shown, in this embodiment, the first lens L1 is a convex-concave plastic aspheric lens with negative power, the second lens L2 is a concave-convex plastic aspheric lens with positive power, the third lens L3 is a convex-concave plastic aspheric lens with positive power, the fourth lens L4 is a convex-concave plastic aspheric lens with negative power, the fifth lens L5 is a biconvex glass spherical lens with positive power, the sixth lens L6 is a concave-convex glass spherical lens with negative power, the sixth lens L7 is a biconvex plastic aspheric lens with positive power, the eighth lens L8 is a concave-convex plastic aspheric lens with negative power, and the ninth lens L9 is a convex-concave plastic aspheric lens with positive 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 6.91 mm, 4.73 mm, 6.44 mm, 6.22 mm, 5.60 mm, 5.29 mm, 4.97 mm, 4.95 mm and 6.01 mm respectively.

[0095] Specifically, the optical parameters of each lens are shown in Table 7 below, and the aspheric coefficients are shown in Table 8. The aspheric coefficients include the conic quadratic coefficient k, the high-order coefficient A i .

[0096] Table 7

[0097]

[0098]

[0099] Table 8

[0100] k <![CDATA[A2]]> <![CDATA[A3]]> <![CDATA[A4]]> <![CDATA[A5]]> <![CDATA[A6]]> <![CDATA[A7]]> <![CDATA[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

[0101] Fig.14 The MTF graph of the lens shown in the figure shows 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 curve decreases evenly and smoothly from the center to the edge of the field of view, and has good imaging quality and good resolution in both low-frequency and high-frequency conditions. Fig.15 The figure shows the field curvature and distortion of the lens. The optical distortion is less than 33% within a field of view of 104°. Fig.16 It is the chromatic aberration curve of the lens shown. The chromatic aberration of long wave and short wave is within 9um, and the real half image height IH corresponding to the maximum field angle is 6.5402mm. According to 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 real half image height IH corresponding to the maximum field angle and the effective focal length f, IH / f is 0.88. The total optical length TTL and the real half image height IH corresponding to the maximum field angle, TTL / IH is 4.59. The lens samples three glass spherical lenses and six plastic aspherical lenses. The fourth lens L4, the fifth lens L5 and the sixth lens L6 are glued to form the first glued lens group. The plastic aspherical lens effectively distributes the focal length to improve the imaging quality of the lens, making the overall structure compact, the total optical length TTL is less than 30mm, effectively saving assembly space, and more miniaturized. And the aperture FNO is 1.07, which meets the requirements of clear imaging in weak light.

[0102] The above-mentioned embodiments only express one or several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A large-surface optical lens, characterized in that: The optical system 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, which are arranged in sequence from the object side to the image side. Among them: The first lens L1 is a convex-concave plastic aspheric lens with negative optical power; The second lens L2 is a concave-convex plastic aspherical lens with positive refractive power; The third lens L3 is a convex-concave plastic aspherical lens with positive refractive power; The fourth lens L4 is a convex-concave lens with negative optical power; The fifth lens L5 is a biconvex glass spherical lens with positive power; The sixth lens L6 is a lens with negative optical power; The seventh lens L7 is a biconvex plastic aspherical lens with positive refractive power; The eighth lens L8 is a concave-convex plastic aspherical lens with negative optical power; The ninth lens L9 is a convex-concave plastic aspherical lens with positive refractive power; And meet the following conditions: -0.25 <f1 / f2<-0.10; 0.50 <f2 / f3<1.90; -1.85 <f3 / f4<-0.65; -20.35 <f4 / f5<-3.05; -0.65 <f5 / f6<-0.30; -1.80 <f6 / f7<-0.55; -1.30 <f7 / f8<-0.55; -1.70 <f8 / f9<-0.95; Among them, f1-f9 are the focal lengths of the first lens L1 to the ninth lens L9 respectively.

2. The large target surface optical lens according to claim 1, characterized in that: The real half-image height IH corresponding to the maximum field angle of the large-surface optical lens and the effective focal length f of the large-surface optical lens satisfy the following conditions: 0.8 <IH / f<1.0。 3. The large target surface optical lens according to claim 1, characterized in that: The total optical length TTL of the large-surface optical lens and the real half-image height IH corresponding to the maximum field angle of the large-surface optical lens satisfy: 4.5 <TTL / IH<5。 4. The large target surface optical lens according to claim 1, characterized in that: The large-surface optical lens also meets the following conditions: Among them, n d1 ~n d9 are the refractive indices of the first lens L1 to the ninth lens L9 in sequence.

5. The large target surface optical lens according to claim 1, characterized in that: The large-surface optical lens also meets the following conditions: Among them, v d1 ~v d9 are the Abbe numbers of the first lens L1 to the ninth lens L9 in sequence.

6. The large-target-area optical lens according to claim 1, characterized in that: The aperture FNO of the large-target optical lens satisfies: 1.00≤FNO≤1.

1.

7. The large-target-area optical lens according to claim 1, characterized in that: The field of view angle of the large target optical lens satisfies: 100°≤FOV≤105°, optical back focus BFL>4.6mm, CRA<15°.

8. The large target surface optical lens according to claim 1, characterized in that: The effective focal length f of the large target optical lens is 7.20 mm to 7.45 mm, and the total optical length TTL is less than 30 mm.

9. The large target surface optical lens according to claim 1, characterized in that: The object side effective diameter DM1 of the first lens to the object side effective diameter DM9 of the ninth lens satisfy: 1.45<DM1 / DM2<1.55; 0.73<DM2 / DM3<0.75; 1.00<DM3 / DM4<1.05; 1.00<DM4 / DM5<1.15; 1.00<DM5 / DM6<1.15; 1.00<DM6 / DM7<1.10; 0.95<DM7 / DM8<1.05; 0.75<DM8 / DM9<0.

95.

10. The large target surface optical lens according to claim 1, characterized in that: The working wavelength band of the large-target optical lens is 436nm-656nm, and the main wavelength is 546nm.

Images