Large-aperture lens

Abstract

The utility model relates to the technical field of optical lenses, in particular to a large-aperture lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens from an object space to an image space along an optical axis. The large-aperture lens provided by the utility model has the beneficial effects that the objective lens of the large-aperture lens adopts a nine-lens structure and comprises the three bonding lenses, and through the optimized design of the plurality of lenses, the dispersion and aberration are effectively reduced, and the MTF (Modulation Transfer Function) and aberration performance of a full view field are improved. Meanwhile, the light path structure is optimized through the common diaphragm design, and the imaging quality is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical lens technical field, concretely relates to a large aperture lens. BACKGROUND

[0002] With the rapid development of science and technology, the parameter and technical performance requirement of lens are higher and higher, especially in the field of large aperture lens, how to effectively reduce aberration and improve image quality while ensuring high imaging quality and large aperture becomes an important technology with great challenge.

[0003] In the prior art, a large aperture lens usually needs to adopt a multi-lens design, such as a three-cemented lens or a shared diaphragm design, to optimize the light path structure and reduce aberration. However, these designs, although improving the imaging quality to some extent, have the following problems: first, the multi-lens design increases the manufacturing cost and the complexity of the system; second, the use of the aperture can lead to a reduction in light flux, thereby affecting the image quality; in addition, the MTF (number of points per sensitivity) and aberration control in the full field of view range in the prior art are still not ideal, especially in low light environments, which can cause image blur or insufficient sharpness, at which time a large aperture lens with a simple structure that can clearly resolve images even in low light environments is needed. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a large aperture lens that meets the requirements of full field of view high resolution and clear imaging.

[0005] To solve the above technical problems, the utility model adopts the technical scheme of providing a large aperture lens, which includes a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens in order along the optical axis from the object side to the image side.

[0006] Each of the above lenses includes a first surface facing the object side and a second surface facing away from the first surface.

[0007] The first lens is a positive focal power lens, the first surface of which is convex, and the second surface is concave.

[0008] The second lens is a positive focal power lens, the first surface of which is convex, and the second surface is convex.

[0009] The third lens is a negative focal power lens, and the second surface thereof is concave.

[0010] The fourth lens is a positive focal power lens, and the second surface thereof is convex.

[0011] The fifth lens is a negative focal power lens, the first surface of which is concave, and the second surface is concave.

[0012] The sixth lens is a positive focal length lens, the first surface of which is a convex surface, and the second surface of which is a convex surface;

[0013] The seventh lens is a positive focal length lens, the first surface of which is a convex surface, and the second surface of which is a concave surface;

[0014] The eighth lens is a negative focal length lens, the first surface of which is a convex surface, and the second surface of which is a concave surface;

[0015] The ninth lens is a plane lens;

[0016] The second lens, the third lens and the fourth lens are glued to form a three-glued lens.

[0017] The utility model discloses a large aperture lens, the objective lens adopts the structure of nine lenses, including three-glued lens, through the optimal design of multiple lenses, effectively reduce dispersion and aberration, improve the MTF and aberration performance of full view. Meanwhile, the common stop design optimizes the light path structure, further improves the imaging quality. The large aperture lens has clear imaging in 0.435-0.656um wave band, satisfies full view MTF > 160lp / mm and is characterized by satisfying the following parameters: focal length: 48~52.8mm F number: F1.0 optical total length: 81.6~89.76mm FOV: 10.3 degree image height: 8.64~9.504mm. And full view distortion is less than 0.25%, relative luminance is greater than 76%, can ensure that the image is clear in low light environment. This design not only maintains the large aperture, but also effectively reduces dispersion and aberration through reasonable glass material selection and lens parameter optimization, realizes high-quality full view imaging, and provides a new solution for modern monitoring lens and other applications. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the optical system diagram of the large aperture lens of the embodiment of the utility model's specific implementation mode;

[0019] Figure 2 It is the MTF diagram of the large aperture lens of embodiment 1 of the embodiment of the utility model's specific implementation mode;

[0020] Figure 3 It is the point column diagram of the large aperture lens of embodiment 1 of the embodiment of the utility model's specific implementation mode;

[0021] Figure 4 It is the field curvature / distortion diagram of the large aperture lens of embodiment 1 of the embodiment of the utility model's specific implementation mode;

[0022] Figure 5 It is the illumination diagram of the large aperture lens of embodiment 1 of the embodiment of the utility model's specific implementation mode

[0023] Figure 6 MTF chart of the large aperture lens of embodiment 2 of the specific implementation manner of the utility model;

[0024] Figure 7 point chart of the large aperture lens of embodiment 2 of the specific implementation manner of the utility model;

[0025] Figure 8 field curvature / distortion chart of the large aperture lens of embodiment 2 of the specific implementation manner of the utility model;

[0026] Figure 9 illuminance chart of the large aperture lens of embodiment 2 of the specific implementation manner of the utility model;

[0027] Figure 10 MTF chart of the large aperture lens of embodiment 3 of the specific implementation manner of the utility model;

[0028] Figure 11 point chart of the large aperture lens of embodiment 3 of the specific implementation manner of the utility model;

[0029] Figure 12 field curvature / distortion chart of the large aperture lens of embodiment 3 of the specific implementation manner of the utility model;

[0030] Figure 13 illuminance chart of the large aperture lens of embodiment 3 of the specific implementation manner of the utility model;

[0031] Label explanation:

[0032] 1, first lens; 2, second lens; 3, third lens; 4, fourth lens; 5, diaphragm; 6, fifth lens; 7, sixth lens; 8, seventh lens; 9, eighth lens; 10, ninth lens; 11, image surface. Specific implementation

[0033] To explain the technical content, the purpose and effect realized by the utility model in detail, the following is explained by combining with the embodiment and the accompanying drawings.

[0034] Please refer to Figure 1 The utility model provides a kind of large aperture lens, and it includes first lens 1, second lens 2, third lens 3, fourth lens 4, diaphragm 5, fifth lens 6, sixth lens 7, seventh lens 8, eighth lens 9 and ninth lens 10 from object side to image side (image surface 11) along optical axis in sequence;

[0035] Each of the above-mentioned lenses includes a first surface facing the object side and a second surface facing away from the first surface;

[0036] The first lens 1 is a positive lens, and the first surface is convex, and the second surface is concave.

[0037] The second lens 2 is a positive focal length lens, the first surface of which is a convex surface, and the second surface of which is a convex surface;

[0038] The third lens 3 is a negative focal length lens, the second surface of which is a concave surface;

[0039] The fourth lens 4 is a positive focal length lens, the second surface of which is a convex surface;

[0040] The fifth lens 6 is a negative focal length lens, the first surface of which is a concave surface, and the second surface of which is a concave surface;

[0041] The sixth lens 7 is a positive focal length lens, the first surface of which is a convex surface, and the second surface of which is a convex surface;

[0042] The seventh lens 8 is a positive focal length lens, the first surface of which is a convex surface, and the second surface of which is a concave surface;

[0043] The eighth lens 9 is a negative focal length lens, the first surface of which is a convex surface, and the second surface of which is a concave surface;

[0044] The ninth lens 10 is a plane lens;

[0045] The second lens 2, the third lens 3 and the fourth lens 4 are glued to form a three-glued lens.

[0046] The large-aperture lens has the advantages that: the large-aperture lens adopts the structure of nine lenses, includes a three-glued lens, the optimization design of the multiple lenses effectively reduces dispersion and aberration, and improves the MTF and aberration performance of a full field of view.

[0047] Further, in the large-aperture lens, the curvature radius of the first surface of the first lens 1 is 46.771-51.448 mm, and the curvature radius of the second surface is 120.221-132.243 mm;

[0048] The curvature radius of the first surface of the second lens 2 is 31.017-34.119 mm, and the curvature radius of the second surface is -130.404--118.549 mm;

[0049] The curvature radius of the second surface of the third lens 3 is 16.873-18.561 mm;

[0050] The curvature radius of the second surface of the fourth lens 4 is -298.528--271.389 mm;

[0051] The radius of curvature of the first surface of the fifth lens 6 is -81.090~ -73.718 mm, and the radius of curvature of the second surface is 44.983~49.481 mm;

[0052] The radius of curvature of the first surface of the sixth lens 7 is 55.281~60.809 mm, and the radius of curvature of the second surface is -63.239~ -57.490 mm;

[0053] The radius of curvature of the first surface of the seventh lens 8 is 16.303~17.934 mm, and the radius of curvature of the second surface is 37.231~40.954 mm;

[0054] The radius of curvature of the first surface of the eighth lens 9 is 78.814~86.696 mm, and the radius of curvature of the second surface is 11.247~12.372 mm.

[0055] From the above description, it can be seen that the design of the above-mentioned radius of curvature realizes high-quality full-view imaging while maintaining a large aperture through reasonable parameter optimization.

[0056] Further, in the large-aperture lens, the central thickness of the first lens 1 is 5.948~6.543 mm;

[0057] The central thickness of the second lens 2 is 7.536~8.290 mm;

[0058] The central thickness of the third lens 3 is 1.440~1.584 mm;

[0059] The central thickness of the fourth lens 4 is 8.061~8.867 mm;

[0060] The central thickness of the fifth lens 6 is 1.440~1.584 mm;

[0061] The central thickness of the sixth lens 7 is 4.262~4.689 mm;

[0062] The central thickness of the seventh lens 8 is 4.141~4.555 mm;

[0063] The central thickness of the eighth lens 9 is 1.440~1.584 mm;

[0064] The central thickness of the ninth lens 10 is 1.440~1.584 mm.

[0065] From the above description, it can be seen that the design of the central thickness of the above-mentioned lens realizes high-quality full-view imaging while maintaining a large aperture through reasonable parameter optimization.

[0066] Further, in the large-aperture lens, the air gap between the first lens 1 and the second lens 2 is 15.940~17.534 mm;

[0067] The air gap between the fourth lens 4 and the fifth lens 6 is 0.886~0.974 mm;

[0068] The air gap between the fifth lens 6 and the sixth lens 7 is 16.225~17.847 mm;

[0069] The air gap between the sixth lens 7 and the seventh lens 8 is 0.096~0.106 mm;

[0070] The air gap between the seventh lens 8 and the eighth lens 9 is 0.735~0.808 mm.

[0071] From the above description, it can be seen that the design of the air gap between the lenses described above, while maintaining a large aperture, achieves high-quality full-view imaging through reasonable parameter optimization.

[0072] Further, in the large-aperture lens, the semi-diameter of the first surface of the first lens 1 is 23.75~26.124 mm, and the semi-diameter of the second surface is 23.219~25.541 mm;

[0073] The semi-diameter of the first surface of the second lens 2 is 16.522~18.174 mm, and the semi-diameter of the second surface is 15.744~17.319 mm;

[0074] The semi-diameter of the second surface of the third lens 3 is 12.936~14.230 mm;

[0075] The semi-diameter of the second surface of the fourth lens 4 is 12.624~13.887 mm;

[0076] The semi-diameter of the first surface of the fifth lens 6 is 12.593~13.852 mm, and the semi-diameter of the second surface is 12.106~13.316 mm;

[0077] The semi-diameter of the first surface of the sixth lens 7 is 11.997~13.196 mm, and the semi-diameter of the second surface is 11.803~12.983 mm;

[0078] The semi-diameter of the first surface of the seventh lens 8 is 10.208~11.229 mm, and the semi-diameter of the second surface is 9.294~10.223 mm;

[0079] The semi-diameter of the first surface of the eighth lens 9 is 9.211~10.132 mm, and the semi-diameter of the second surface is 7.379~8.117 mm;

[0080] The first surface of the ninth lens 10 has a half diameter of 4.816-5.297 mm, and the second surface has a half diameter of 4.538-4.991 mm.

[0081] Further, in the above-mentioned large-aperture lens, the refractive index and Abbe number of each lens satisfy the following conditions, respectively:

[0082] The glass material of the first lens 1: 1.80 < n < 2.10, 10 < Vd < 30;

[0083] The glass material of the second lens 2: 1.45 < n < 1.65, 55 < Vd < 70;

[0084] The glass material of the third lens 3: 1.80 < n < 2.10, 10 < Vd < 30;

[0085] The glass material of the fourth lens 4: 1.45 < n < 1.65, 55 < Vd < 70;

[0086] The glass material of the fifth lens 6: 1.55 < n < 1.75, 25 < Vd < 45;

[0087] The glass material of the sixth lens 7: 1.80 < n < 2.10, 15 < Vd < 35;

[0088] The glass material of the seventh lens 8: 1.80 < n < 2.10, 25 < Vd < 45;

[0089] The glass material of the eighth lens 9: 1.55 < n < 1.75, 25 < Vd < 45;

[0090] The glass material of the ninth lens 10: 1.45 < n < 1.65, 55 < Vd < 70.

[0091] As can be seen from the above description, the above-mentioned design effectively reduces chromatic dispersion and aberration while maintaining a large aperture, and realizes high-quality full-view imaging through reasonable selection of glass materials and optimization of lens parameters.

[0092] Embodiment 1

[0093] Please refer to Figure 1 , Figures 2 to 5 The embodiment provides a large-aperture lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens (the ninth lens simulates a filter and packaging glass) arranged in order from an object side to an image side. The second, third, and fourth lenses are three cemented lenses.

[0094] The first lens is a positive lens, the first surface is convex, and the second surface is concave.

[0095] The second lens is a positive power lens, the first surface is a convex surface, and the second surface is a convex surface;

[0096] The third lens is a negative power lens, and the second surface is a concave surface;

[0097] The fourth lens is a positive power lens, and the second surface is a convex surface;

[0098] The fifth lens is a negative power lens, the first surface is a concave surface, and the second surface is a concave surface;

[0099] The sixth lens is a positive power lens, the first surface is a convex surface, and the second surface is a convex surface;

[0100] The seventh lens is a positive power lens, the first surface is a convex surface, and the second surface is a concave surface;

[0101] The eighth lens is a negative power lens, the first surface is a convex surface, and the second surface is a concave surface;

[0102] The ninth lens is a plane lens;

[0103] The glass material of the first lens: 1.80 < n < 2.10, 10 < Vd < 30;

[0104] The glass material of the second lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0105] The glass material of the third lens: 1.80 < n < 2.10, 10 < Vd < 30;

[0106] The glass material of the fourth lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0107] The glass material of the fifth lens: 1.55 < n < 1.75, 25 < Vd < 45;

[0108] The glass material of the sixth lens: 1.80 < n < 2.10, 15 < Vd < 35;

[0109] The glass material of the seventh lens: 1.80 < n < 2.10, 25 < Vd < 45;

[0110] The glass material of the eighth lens: 1.55 < n < 1.75, 25 < Vd < 45;

[0111] The glass material of the ninth lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0112] Table 1 is the optical structure parameters of the large aperture lens of the embodiment;

[0113] Table 1

[0114]

[0115] The road monitoring lens has clear imaging in the 0.435-0.656um waveband, meets the full-view MTF>160lp / mm, and is characterized by meeting the following parameters: focal length: 50mm; F number: 1.0; optical total length: 85mm; FOV: 10.3°; image height: 9mm.

[0116] Figure 2 MTF diagram of the large-aperture lens of Example 1; Figure 3 Point diagram of the large-aperture lens of Example 1; Figure 4 Field curvature / distortion diagram of the large-aperture lens of Example 1; Figure 5 Illumination diagram of the large-aperture lens of Example 1.

[0117] Example 2

[0118] See Figure 1 , Figures 6 to 9 The embodiment provides a large-aperture lens, which comprises, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens (the ninth lens simulates a filter and packaging glass). The second, third and fourth lenses are three cemented lenses.

[0119] The first lens is a positive-power lens, the first surface is a convex surface, and the second surface is a concave surface;

[0120] The second lens is a positive-power lens, the first surface is a convex surface, and the second surface is a convex surface;

[0121] The third lens is a negative-power lens, and the second surface is a concave surface;

[0122] The fourth lens is a positive-power lens, and the second surface is a convex surface;

[0123] The fifth lens is a negative-power lens, the first surface is a concave surface, and the second surface is a concave surface;

[0124] The sixth lens is a positive-power lens, the first surface is a convex surface, and the second surface is a convex surface;

[0125] The seventh lens is a positive-power lens, the first surface is a convex surface, and the second surface is a concave surface;

[0126] The eighth lens is a negative-power lens, the first surface is a convex surface, and the second surface is a concave surface;

[0127] The ninth lens is a plane lens;

[0128] The glass material of the first lens: 1.80

[0129] Glass material of the second lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0130] Glass material of the third lens: 1.80 < n < 2.10, 10 < Vd < 30;

[0131] Glass material of the fourth lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0132] Glass material of the fifth lens: 1.55 < n < 1.75, 25 < Vd < 45;

[0133] Glass material of the sixth lens: 1.80 < n < 2.10, 15 < Vd < 35;

[0134] Glass material of the seventh lens: 1.80 < n < 2.10, 25 < Vd < 45;

[0135] Glass material of the eighth lens: 1.55 < n < 1.75, 25 < Vd < 45;

[0136] Glass material of the ninth lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0137] Table 2 is the optical structure parameter of the large aperture lens of the present embodiment;

[0138] Table 2

[0139]

[0140] The road monitoring lens has clear imaging in the 0.435-0.656um waveband, and meets the parameters of full field MTF > 160 lp / mm, and is characterized by the following parameters: focal length: 48mm; F number: 1.0; optical total length: 81.6mm; FOV: 10.3°; image height: 8.64mm.

[0141] Figure 6 MTF diagram of the large aperture lens of embodiment 2; Figure 7 Point column diagram of the large aperture lens of embodiment 2; Figure 8 Field curvature / distortion diagram of the large aperture lens of embodiment 2; Figure 9 Illumination diagram of the large aperture lens of embodiment 2.

[0142] Embodiment 3

[0143] Please refer to Figure 1 , Figures 10 to 13The embodiment provides a large aperture lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens (the ninth lens simulates a filter and packaging glass) arranged in sequence from an object side to an image side.

[0144] The first lens is a positive focal length lens, the first surface is a convex surface, and the second surface is a concave surface;

[0145] The second lens is a positive focal length lens, the first surface is a convex surface, and the second surface is a convex surface;

[0146] The third lens is a negative focal length lens, and the second surface is a concave surface;

[0147] The fourth lens is a positive focal length lens, and the second surface is a convex surface;

[0148] The fifth lens is a negative focal length lens, the first surface is a concave surface, and the second surface is a concave surface;

[0149] The sixth lens is a positive focal length lens, the first surface is a convex surface, and the second surface is a convex surface;

[0150] The seventh lens is a positive focal length lens, the first surface is a convex surface, and the second surface is a concave surface;

[0151] The eighth lens is a negative focal length lens, the first surface is a convex surface, and the second surface is a concave surface;

[0152] The ninth lens is a plane lens;

[0153] The glass material of the first lens: 1.80 < n < 2.10, 10 < Vd < 30;

[0154] The glass material of the second lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0155] The glass material of the third lens: 1.80 < n < 2.10, 10 < Vd < 30;

[0156] The glass material of the fourth lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0157] The glass material of the fifth lens: 1.55 < n < 1.75, 25 < Vd < 45;

[0158] The glass material of the sixth lens: 1.80 < n < 2.10, 15 < Vd < 35;

[0159] The glass material of the seventh lens: 1.80 < n < 2.10, 25 < Vd < 45;

[0160] Glass material of the eighth lens: 1.55 < n < 1.75, 25 < Vd < 45;

[0161] Glass material of the ninth lens: 1.45 < n < 1.65, 55 < Vd < 70;

[0162] Table 3 is the optical structure parameter of the large aperture lens of the embodiment

[0163] Table 3

[0164]

[0165] The road monitoring lens has clear imaging in the 0.435-0.656um wave band, meets the full field of view MTF>160lp / mm, and is characterized by meeting the following parameters: focal length: 52.8mm; F number: 1.0; optical total length: 89.76mm; FOV: 10.3°; image height: 9.504mm.

[0166] Figure 10 The MTF diagram of the large aperture lens of the embodiment 3; Figure 11 The spot diagram of the large aperture lens of the embodiment 3; Figure 12 The field curvature / distortion diagram of the large aperture lens of the embodiment 3; Figure 13 The illumination diagram of the large aperture lens of the embodiment 3.

[0167] The above only describes the embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent transformation, direct or indirect application in the related technical field by using the contents of the utility model specification and drawings are all included in the patent protection range of the utility model.

Claims

1. A large aperture lens characterized by, The first lens, the second lens, the third lens, the fourth lens, the diaphragm, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are sequentially arranged along the optical axis from the object side to the image side; Each of the lenses comprises a first surface facing the object side and a second surface facing away from the first surface; The first lens is a positive lens, the first surface of which is convex, and the second surface of which is concave; The second lens is a positive lens, the first surface of which is convex, and the second surface of which is convex; The third lens is a negative lens, the second surface of which is concave; The fourth lens is a positive lens, the second surface of which is convex; The fifth lens is a negative lens, the first surface of which is concave, and the second surface of which is concave; The sixth lens is a positive lens, the first surface of which is convex, and the second surface of which is convex; The seventh lens is a positive lens, the first surface of which is convex, and the second surface of which is concave; The eighth lens is a negative lens, the first surface of which is convex, and the second surface of which is concave; The ninth lens is a plane lens; The second lens, the third lens and the fourth lens are cemented together to form a three-cemented lens.

2. The large aperture lens of claim 1, wherein, The first surface of the first lens has a radius of curvature of 46.771-51.448 mm, and the second surface has a radius of curvature of 120.221-132.243 mm; The first surface of the second lens has a radius of curvature of 31.017-34.119 mm, and the second surface has a radius of curvature of -130.404--118.549 mm; The second surface of the third lens has a radius of curvature of 16.873-18.561 mm; The second surface of the fourth lens has a radius of curvature of -298.528--271.389 mm; The first surface of the fifth lens has a radius of curvature of -81.090--73.718 mm, and the second surface has a radius of curvature of 44.983-49.481 mm; The first surface of the sixth lens has a radius of curvature of 55.281-60.809 mm, and the second surface has a radius of curvature of -63.239--57.490 mm; The first surface of the seventh lens has a radius of curvature of 16.303-17.934 mm, and the second surface has a radius of curvature of 37.231-40.954 mm; The first surface of the eighth lens has a radius of curvature of 78.814-86.696 mm, and the second surface has a radius of curvature of 11.247-12.372 mm.

3. The large aperture lens of claim 1, wherein, The central thickness of the first lens is 5.948-6.543 mm; The central thickness of the second lens is 7.536-8.290 mm; The central thickness of the third lens is 1.440-1.584 mm; The central thickness of the fourth lens is 8.061-8.867 mm; The central thickness of the fifth lens is 1.440-1.584 mm; The central thickness of the sixth lens is 4.262-4.689 mm; The central thickness of the seventh lens is 4.141-4.555 mm; The central thickness of the eighth lens is 1.440-1.584 mm; The center thickness of the ninth lens is 1.440-1.584 mm.

4. The large aperture lens of claim 1, wherein, The air gap between the first lens and the second lens is 15.940-17.534 mm; The air gap between the fourth lens and the fifth lens is 0.886-0.974 mm; The air gap between the fifth lens and the sixth lens is 16.225-17.847 mm; The air gap between the sixth lens and the seventh lens is 0.096-0.106 mm; The air gap between the seventh lens and the eighth lens is 0.735-0.808 mm.

5. The large aperture lens of claim 1, wherein, The half diameter of the first surface of the first lens is 23.75-26.124 mm, and the half diameter of the second surface is 23.219-25.541 mm; The half diameter of the first surface of the second lens is 16.522-18.174 mm, and the half diameter of the second surface is 15.744-17.319 mm; The half diameter of the second surface of the third lens is 12.936-14.230 mm; The half diameter of the second surface of the fourth lens is 12.624-13.887 mm; The half diameter of the first surface of the fifth lens is 12.593-13.852 mm, and the half diameter of the second surface is 12.106-13.316 mm; The half diameter of the first surface of the sixth lens is 11.997-13.196 mm, and the half diameter of the second surface is 11.803-12.983 mm; The half diameter of the first surface of the seventh lens is 10.208-11.229 mm, and the half diameter of the second surface is 9.294-10.223 mm; The half diameter of the first surface of the eighth lens is 9.211-10.132 mm, and the half diameter of the second surface is 7.379-8.117 mm; The half diameter of the first surface of the ninth lens is 4.816-5.297 mm, and the half diameter of the second surface is 4.538-4.991 mm.

6. The large aperture lens of claim 1, wherein, The refractive index and Abbe number of each lens satisfy the following conditions: The glass material of the first lens: 1.80 < n < 2.10, 10 < Vd < 30; The glass material of the second lens: 1.45 < n < 1.65, 55 < Vd < 70; The glass material of the third lens: 1.80 < n < 2.10, 10 < Vd < 30; The glass material of the fourth lens: 1.45 < n < 1.65, 55 < Vd < 70; The glass material of the fifth lens: 1.55 < n < 1.75, 25 < Vd < 45; The glass material of the sixth lens: 1.80 < n < 2.10, 15 < Vd < 35; The glass material of the seventh lens: 1.80 < n < 2.10, 25 < Vd < 45; The glass material of the eighth lens: 1.55 < n < 1.75, 25 < Vd < 45; The glass material of the ninth lens: 1.45 < n < 1.65, 55 < Vd < 70.

Images