20mm large-aperture athermalization high-definition day and night dual-purpose internal focusing all-glass lens

Abstract

The utility model discloses a 20mm large-aperture athermalization high-definition day and night dual-purpose internal focusing all-glass lens. From the object side to the image side along the optical axis of the lens, the following components are sequentially arranged: a glass first lens with negative focal power; the second glass lens has negative focal power; the third glass lens has positive focal power; the spherical glass fourth lens has positive focal power; the fifth spherical glass lens has positive focal power; the sixth glass lens has negative focal power; the seventh glass lens has negative focal power; the eighth glass lens has positive focal power; a glass ninth lens with positive focal power; and the tenth glass lens has negative focal power. According to the utility model, a 10-piece full-glass framework is adopted, the total focal length f of the optical lens is equal to 20mm, the aperture F # is less than or equal to 1.0, and under the condition of large aperture and large focal length, the clear aperture is larger, the real shot picture is clear, and the low-illumination photographing effect is excellent.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to a 20mm large aperture athermal high-definition day and night dual-purpose internal focusing all-glass lens. Background Art

[0002] As digital imaging and display technologies become more and more mature, electronic telescopes with low cost, easy operation, high flexibility and portability are becoming easier and easier to realize. When performing special tasks, they have strong survivability, good mobility and are easy to use, playing an important role in dealing with natural disasters, accidents and disasters, and social security incidents. In recent years, with the improvement of people's living standards, some consumer-grade electronic telescopes have also appeared in people's daily lives, enriching their entertainment and amateur life, but both professional and consumer-grade electronic telescopes are inseparable from the objective lens they carry. Utility Model Content

[0003] Based on this, the purpose of the utility model is to provide a 20mm large aperture athermal high-definition day and night dual-use internal focus all-glass lens, which uses 10 pieces of glass and can be matched with an 8MP, 1-inch chip, with clear real-time pictures and excellent low-light photography effects.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] A 20mm large aperture athermal high-definition day and night dual-purpose internal focusing all-glass lens, the surface of the lens adjacent to the object plane is defined as the object side surface, the surface of the lens adjacent to the image plane is defined as the image side surface, and the lens is arranged in order from the object side to the image side along the optical axis of the lens:

[0006] A first lens, wherein the first lens is a glass lens with negative optical power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

[0007] a second lens, wherein the second lens is a glass lens with negative optical power, and the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a concave surface;

[0008] A third lens, wherein the third lens is a glass lens with positive power, the object side surface of the third lens is a concave surface, and the image side surface is a convex surface;

[0009] a fourth lens, wherein the fourth lens is a spherical glass lens with positive power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface;

[0010] Aperture diaphragm;

[0011] A fifth lens, wherein the fifth lens is a spherical glass lens with positive refractive power, and the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface;

[0012] a sixth lens, wherein the sixth lens is a glass lens with negative optical power, wherein the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface;

[0013] A seventh lens, wherein the seventh lens is a glass lens with negative optical power, the object side surface of the seventh lens is convex, and the image side surface is concave;

[0014] an eighth lens, wherein the eighth lens is a glass lens with positive power, and the object-side surface of the eighth lens is a convex surface, and the image-side surface of the eighth lens is a convex surface;

[0015] A ninth lens, wherein the ninth lens is a glass lens with positive power, and the object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface;

[0016] A tenth lens, wherein the tenth lens is a glass lens with negative optical power, and the object side surface of the ninth lens is a concave surface, and the image side surface is a convex surface;

[0017] A filter, wherein the filter is made of H-K9L glass;

[0018] A protective glass and an image acquisition element, wherein the protective glass is integrated on the image acquisition element and is arranged on the image side of the filter;

[0019] in,

[0020] The image side surface of the fifth lens and the object side surface of the sixth lens are glued together to form a double glued lens;

[0021] The image side surface of the seventh lens and the object side surface of the eighth lens are glued together to form a double glued lens;

[0022] The seventh lens, the eighth lens, the ninth lens and the tenth lens constitute a built-in focusing lens group.

[0023] Furthermore, the lens satisfies the following relationship:

[0024] 0.05≤IC / TTL≤0.065

[0025] 5.97≤TTL / f≤7.94

[0026] 0.10≤OBFL / TTL≤0.16;

[0027] In the relationship, f is the total focal length of the lens, TTL is the total optical length of the lens, OBFL is the optical back focus of the lens, and IC is the total image height of the chip matched with the lens system.

[0028] Furthermore, the lens satisfies the following relationship:

[0029] -3.62≤f1 / f≤-2.87,

[0030] -1.15≤f2 / f≤-0.96,

[0031] 2.03≤f3 / f≤2.98,

[0032] 2.16≤f4 / f≤3.08,

[0033] 1.28≤f5 / f≤1.60,

[0034] -1.03≤f6 / f≤-0.83,

[0035] -3.30≤f7 / f≤-2.20,

[0036] 1.50≤f8 / f≤1.83,

[0037] 1.54≤f9 / f≤1.89,

[0038] -15.76≤f10 / f≤-10.81;

[0039] In the relationship, f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, f9 is the focal length of the ninth lens, and f10 is the focal length of the tenth lens.

[0040] Furthermore, the aperture of the lens is F#, satisfying F#≤1.0.

[0041] Furthermore, the total focal length of the lens is f, satisfying f=20 mm.

[0042] Furthermore, the total optical length of the lens is TTL, satisfying TTL≤200 mm.

[0043] Furthermore, the focal length, refractive index and curvature radius of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens respectively meet the following conditions:

[0044]

[0045]

[0046] Wherein, f1 is the focal length of the first lens, ND1 is the refractive index of the first lens, R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens; f2 is the focal length of the second lens, ND2 is the refractive index of the second lens 2, R21 is the curvature radius of the object side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens; f is the focal length of the third lens, ND3 is the refractive index of the third lens, R31 is the curvature radius of the object side surface of the third lens, and R32 is the curvature radius of the image side surface of the third lens; f4 is the focal length of the fourth lens, ND4 is the refractive index of the fourth lens, R41 is the curvature radius of the object side surface of the fourth lens, and R42 is the curvature radius of the image side surface of the fourth lens; f5 is the focal length of the fifth lens, ND5 is the refractive index of the fifth lens, R51 is the curvature radius of the object side surface of the fifth lens, and R52 is the curvature radius of the image side surface of the fifth lens; f6 is the focal length of the sixth lens, ND6 is the refractive index of the sixth lens, R61 is the radius of curvature of the object side surface of the sixth lens, and R62 is the radius of curvature of the image side surface of the sixth lens; f7 is the focal length of the seventh lens, ND7 is the refractive index of the seventh lens, R71 is the radius of curvature of the object side surface of the seventh lens, and R72 is the radius of curvature of the image side surface of the seventh lens; f8 is the focal length of the eighth lens, ND8 is the refractive index of the eighth lens, R81 is the radius of curvature of the object side surface of the eighth lens, and R82 is the radius of curvature of the image side surface of the eighth lens; f9 is the focal length of the ninth lens, ND9 is the refractive index of the ninth lens, R91 is the radius of curvature of the object side surface of the ninth lens, and R92 is the radius of curvature of the image side surface of the ninth lens; f10 is the focal length of the tenth lens, ND10 is the refractive index of the tenth lens, R101 is the radius of curvature of the object side surface of the tenth lens, and R102 is the radius of curvature of the image side surface of the tenth lens;

[0047] Focal length: The "+" sign indicates that the lens has positive focal power, and the "-" sign indicates that the lens has negative focal power. The unit of focal length is mm;

[0048] Radius of curvature: The "+" sign indicates that the surface is bent toward the image plane, and the "-" sign indicates that the surface is bent toward the object plane. The unit is mm.

[0049] The beneficial effects of the utility model are:

[0050] The utility model adopts a 10-piece all-glass structure, and the total focal length of the optical lens is f=20mm, which meets the aperture F#≤1.0. Under large aperture and large focal length, the light aperture is relatively large, which can ensure the high relative illumination of the system, and there is no dark corner in the picture during shooting. At the same time, the system aberration is well corrected, and the optical performance is good. In terms of manufacturability, each lens is insensitive, the lens surface is simple and easy to manufacture, and the structure between the lenses is compact, which has a high cost performance. In addition, after reasonable lens material selection, optical power distribution and optical design optimization, the utility model can be matched with 8MP, 1" chip to achieve 24-hour all-weather high-definition imaging, excellent low-illuminance effect, and clear real-shot pictures. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is a schematic diagram of the optical structure of Example 1 of the utility model;

[0052] Figure 2 This is a schematic diagram of the optical path structure of Example 1 of the utility model;

[0053] Figure 3 This is a defocus curve diagram of visible light 0.435-0.656 μm (70 lp / mm) in Example 1 of the utility model;

[0054] Figure 4 This is the relative illumination diagram of visible light 0.546 μm in Example 1 of the utility model;

[0055] Figure 5 This is the FFT MTF curve of visible light 0.435-0.656μm of Example 1 of the utility model;

[0056] Figure 6 This is a visible light 0.546μm distortion curve diagram of Example 1 of the utility model;

[0057] Figure 7 This is an on-axis chromatic aberration curve diagram of visible light 0.435-0.656 μm in Example 1 of the utility model;

[0058] Figure 8 This is the FFT MTF curve of visible light at a close distance of 8 meters 0.435-0.656μm in Example 1 of the utility model;

[0059] Fig. 9 This is the infrared 850nm FFT MTF curve diagram of Example 1 of the utility model;

[0060] Fig.10 This is the infrared 850nm close-range 8m FFT MTF curve diagram of Example 1 of the utility model;

[0061] Fig.11 This is a schematic diagram of the optical structure of Example 2 of the utility model;

[0062] Fig.12 This is a schematic diagram of the optical path structure of Embodiment 2 of the present utility model;

[0063] Fig.13 This is a defocus curve diagram of visible light 0.435-0.656 μm (70 lp / mm) in Example 2 of the utility model;

[0064] Fig.14 This is the relative illumination diagram of visible light 0.546 μm in Example 2 of the utility model;

[0065] Fig.15 This is the FFT MTF curve of visible light 0.435-0.656μm of Example 2 of the utility model;

[0066] Fig.16 This is a visible light 0.546μm distortion curve diagram of Example 2 of the utility model;

[0067] Fig.17 This is an on-axis chromatic aberration curve diagram of visible light 0.435-0.656 μm in Example 2 of the utility model;

[0068] Fig.18 This is the FFT MTF curve of visible light at a close distance of 8 meters 0.435-0.656μm in Example 2 of the utility model;

[0069] Fig.19 This is the infrared 850nm FFT MTF curve diagram of Example 2 of the utility model;

[0070] Fig. 20 This is the infrared 850nm close-range 8m FFT MTF curve diagram of Example 2 of the utility model;

[0071] Fig.21 This is a schematic diagram of the optical structure of Example 3 of the utility model;

[0072] Fig. 22 This is a schematic diagram of the optical path structure of Example 3 of the utility model;

[0073] Figure numerals: 1 - first lens; 2 - second lens; 3 - third lens; 4 - fourth lens; 5 - fifth lens; 6 - sixth lens; 7 - seventh lens; 8 - eighth lens; 9 - ninth lens; 10 - tenth lens; 11 - filter; 12 protective glass; 13 - aperture stop. DETAILED DESCRIPTION

[0074] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. In this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. The shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0075] In the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region; if the lens surface is not limited to convex, concave or flat, it means that the lens surface can be convex, concave or flat. The surface of each lens closest to the object is called the object side of the lens, and the surface of each lens closest to the imaging surface is called the image side of the lens.

[0076] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the present invention have the same meaning as commonly understood by ordinary technicians in the field to which the present application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

[0077] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In order to better understand and implement, the utility model is described in detail below with reference to the accompanying drawings.

[0078] The utility model provides a 20mm large aperture athermal high-definition day and night dual-purpose internal focusing all-glass lens. The surface of the lens adjacent to the object plane is the object side surface, and the surface of the lens adjacent to the image plane is the image side surface. Along the optical axis of the lens from the object side to the image side, it includes:

[0079] A first lens 1, wherein the first lens 1 is a glass lens with negative optical power, wherein the object side surface of the first lens 1 is a convex surface, and the image side surface is a concave surface;

[0080] A second lens 2, wherein the second lens 2 is a glass lens with negative optical power, and the object side surface of the second lens 2 is a concave surface, and the image side surface is a concave surface;

[0081] A third lens 3, the third lens 3 is a glass lens with positive refractive power, the object side surface of the third lens 3 is a concave surface, and the image side surface is a convex surface;

[0082] A fourth lens 4, the fourth lens 4 is a spherical glass lens with positive refractive power, the object side surface of the fourth lens 4 is a convex surface, and the image side surface is a convex surface;

[0083] The aperture stop 13 is located between the fourth lens 4 and the fifth lens 5 .

[0084] A fifth lens 5, the fifth lens 5 is a spherical glass lens with positive refractive power, the object side surface of the fifth lens 5 is a convex surface, and the image side surface is a convex surface;

[0085] A sixth lens 6, which is a glass lens with negative optical power, wherein the object side surface of the sixth lens 6 is a concave surface, and the image side surface is a concave surface;

[0086] A seventh lens element 7, wherein the seventh lens element 7 is a glass lens with negative optical power, wherein the object side surface of the seventh lens element 7 is a convex surface, and the image side surface is a concave surface;

[0087] An eighth lens 8, wherein the eighth lens 8 is a glass lens with positive refractive power, and the object-side surface of the eighth lens 8 is a convex surface, and the image-side surface is a convex surface;

[0088] A ninth lens 9, which is a glass lens with positive refractive power, wherein the object side surface of the ninth lens 9 is a convex surface, and the image side surface is a convex surface;

[0089] A ninth lens 10, the ninth lens 10 is a glass lens with negative optical power, the object side surface of the tenth lens 10 is a concave surface, and the image side surface is a convex surface;

[0090] A filter 11, the filter 11 is arranged on the image side of the tenth lens 10, and the filter 11 is made of H-K9L glass;

[0091] A protective glass 12, which is integrated on the image acquisition element and arranged on the image side of the filter 11;

[0092] in,

[0093] The image side surface of the fifth lens 5 and the object side surface of the sixth lens 6 are glued to each other to form a double glued lens;

[0094] The image side surface of the seventh lens 7 and the object side surface of the eighth lens 8 are glued to each other to form a double glued lens;

[0095] The seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10 constitute a built-in focusing lens group.

[0096] In the present invention, in order to make the optical system present better performance, we should reasonably select lens materials, reasonably allocate the focal lengths of each lens and reasonably optimize the optical system during the design process to correct the aberration of the system, and finally optimize the performance of the optical system. In the present invention, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f3, the focal length of the fourth lens 4 is f4, the focal length of the fifth lens 5 is f5, the focal length of the sixth lens 6 is f6, the focal length of the seventh lens 7 is f7, the focal length of the eighth lens 8 is f8, the focal length of the ninth lens 9 is f9, the focal length of the tenth lens 10 is f10, the total focal length of the lens is f, and the ratio of the focal length of each lens to the total focal length of the system meets the following conditions:

[0097] -3.62≤f1 / f≤-2.87,

[0098] -1.15≤f2 / f≤-0.96,

[0099] 2.03≤f3 / f≤2.98,

[0100] 2.16≤f4 / f≤3.08,

[0101] 1.28≤f5 / f≤1.60,

[0102] -1.03≤f6 / f≤-0.83,

[0103] -3.30≤f7 / f≤-2.20,

[0104] 1.50≤f8 / f≤1.83,

[0105] 1.54≤f9 / f≤1.89,

[0106] -15.76≤f10 / f≤-10.81;

[0107] In the present invention, considering the aberration of the optical system and the problem of different focusing object distances, the focal length, refractive index and curvature radius of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10 respectively meet the following conditions:

[0108] f1 -85.87～-57.36 ND1 1.69～1.87 R11 26.17～43.62 R12 13.89～23.16 f2 -27.05～-16.23 ND2 1.84～2.03 R21 -27.61～-16.57 R22 179.02～307.07 f3 35.74～59.56 ND3 1.79～1.98 R31 -164.05～-85.19 R32 -42.99～-24.59 f4 36.97～61.62 ND4 1.86～2.06 R41 50.82～84.70 R42 -230.25～-110.02 f5 21.52～35.87 ND5 1.66～1.84 R51 44.07～73.46 R52 -38.37～-23.02 f6 -23.44～-14.07 ND6 1.72～1.90 R61 -38.37～-23.02 R62 23.22～38.70 f7 -66.03～-36.89 ND7 1.54～1.70 R71 60.56～100.93 R72 19.92～33.19 f8 25.25～42.09 ND8 1.52～1.67 R81 19.92～33.19 R82 -107.11～-63.86 f9 25.87～43.12 ND9 1.54～1.71 R91 24.06～40.11 R92 -62.51～-37.51 f10 -315.17～-184.41 ND10 1.44～1.59 R101 -54.07～-29.28 R102 -78.05～-41.15

[0109] Wherein, f1 is the focal length of the first lens, ND1 is the refractive index of the first lens, R11 is the curvature radius of the object side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens; f2 is the focal length of the second lens, ND2 is the refractive index of the second lens 2, R21 is the curvature radius of the object side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens; f is the focal length of the third lens, ND3 is the refractive index of the third lens, R31 is the curvature radius of the object side surface of the third lens, and R32 is the curvature radius of the image side surface of the third lens; f4 is the focal length of the fourth lens, ND4 is the refractive index of the fourth lens, R41 is the curvature radius of the object side surface of the fourth lens, and R42 is the curvature radius of the image side surface of the fourth lens; f5 is the focal length of the fifth lens, ND5 is the refractive index of the fifth lens, R51 is the curvature radius of the object side surface of the fifth lens, and R52 is the curvature radius of the image side surface of the fifth lens; f6 is the focal length of the sixth lens, ND6 is the refractive index of the sixth lens, R61 is the radius of curvature of the object side surface of the sixth lens, and R62 is the radius of curvature of the image side surface of the sixth lens; f7 is the focal length of the seventh lens, ND7 is the refractive index of the seventh lens, R71 is the radius of curvature of the object side surface of the seventh lens, and R72 is the radius of curvature of the image side surface of the seventh lens; f8 is the focal length of the eighth lens, ND8 is the refractive index of the eighth lens, R81 is the radius of curvature of the object side surface of the eighth lens, and R82 is the radius of curvature of the image side surface of the eighth lens; f9 is the focal length of the ninth lens, ND9 is the refractive index of the ninth lens, R91 is the radius of curvature of the object side surface of the ninth lens, and R92 is the radius of curvature of the image side surface of the ninth lens; f10 is the focal length of the tenth lens, ND10 is the refractive index of the tenth lens, R101 is the radius of curvature of the object side surface of the tenth lens, and R102 is the radius of curvature of the image side surface of the tenth lens;

[0110] Focal length: The "+" sign indicates that the lens has positive focal power, and the "-" sign indicates that the lens has negative focal power. The unit of focal length is mm;

[0111] Radius of curvature: The "+" sign indicates that the surface is bent toward the image plane, and the "-" sign indicates that the surface is bent toward the object plane. The unit is mm.

[0112] In the present invention, f is the total focal length of the lens, TTL is the total optical length of the lens, OBFL is the optical back focus of the lens, and the optical back focus of the lens is the distance from the point closest to the image plane on the image side of the ninth lens to the image plane; IC is the total image height of the 1" chip matched with the lens system; they satisfy the following relationship:

[0113] 0.05≤IC / TTL≤0.065

[0114] 5.97≤TTL / f≤7.94

[0115] 0.10≤OBFL / TTL≤0.16;

[0116] In the utility model, the aperture of the lens is F#, which satisfies F#≤1.0, the focal length of the lens is f, which satisfies f=20mm, and the total optical length of the lens is TTL, which satisfies TTL≤200mm.

[0117] A specific implementation is given below based on the above-mentioned configuration of the present invention to specifically illustrate the 20mm large aperture athermal high-definition day and night dual-use internal focusing all-glass lens according to the present invention.

[0118] The main element symbols in the specific implementation of the utility model are shown in Table 1.

[0119] Table 1

[0120]

[0121]

[0122] The specific implementation data of the present invention are summarized in Table 2 below:

[0123] Table 2

[0124] Conditional expression Example 1 Example 2 Example 3 -3.62≤f1 / f≤-2.87 -3.07 -3.62 -2.87 -1.15≤f2 / f≤-0.96 -0.97 -1.15 -0.96 2.03≤f3 / f≤2.98 2.13 2.98 2.03 2.16≤f4 / f≤3.08 2.20 3.08 2.16 1.28≤f5 / f≤1.60 1.28 1.60 1.34 -1.03≤f6 / f≤-0.83 -0.84 -1.03 -0.83 -3.30≤f7 / f≤-2.20 -2.20 -3.30 -2.30 1.50≤f8 / f≤1.83 1.50 1.83 1.55 1.54≤f9 / f≤1.89 1.54 1.89 1.59 -15.76≤f10 / f≤-10.81 -10.99 -15.76 -10.81 0.05≤IC / TTL≤0.065 0.06 0.050 0.065 5.97≤TTL / f≤7.94 5.97 7.94 6.17 0.10≤OBFL / TTL≤0.16 0.15 0.10 0.16

[0125] Example 1

[0126] Reference Figure 1 , Figure 2 As shown, they are respectively a schematic diagram of the optical structure and a schematic diagram of the optical path structure. In this embodiment, the total focal length of the lens is f=20 mm, the aperture value F#=1.0, the full image height IC=16 mm, the field of view angle DFOV=45°, the total optical length of the lens is TTL=125 mm, and the optical back focus of the lens system is OBFL=19.33 mm.

[0127] In this embodiment, the curvature radius (unit: mm), center thickness d (unit: mm), refractive index (ND) and Abbe constant (VD) of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10 are as shown in Table 3.

[0128] Table 3

[0129] Surface number Curvature radius R Center thickness d Refractive index ND Abbe constant VD S1 32.71 9.11 1.77 49.61 S2 17.37 9.69 S3 -20.71 1.19 1.92 18.90 S4 230.30 1.49 S5 -106.49 14.34 1.88 39.23 S6 -30.74 4.74 S7 63.53 7.74 1.95 17.94 S8 -137.52 10.53 S9 Infinity 0.75 S10 55.09 11.88 1.74 44.90 S11 -28.78 1.47 1.81 25.48 S12 29.02 5.20 S13 75.70 1.14 1.81 25.48 S14 24.89 9.51 1.62 60.37 S15 -79.83 0.05 S16 30.08 9.83 1.59 68.53 S17 -46.88 2.73 S18 -36.59 4.58 1.62 36.35 S19 -51.44 3.25 S20 Infinity 0.70 1.52 64.21 S21 Infinity 15.38

[0130] In Table 3, the radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane, where "Infinity" represents that the surface is a plane; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the current lens material to deflect light, and the Abbe number represents the dispersion characteristics of the current lens material to light.

[0131] refer to Figure 4 As shown, the relative illumination of the lens at the maximum field of view is greater than 50%, and sufficient light enters, ensuring that there will be no dark corners in the actual shot even when the lens is used in a dim environment.

[0132] See also Figure 5 , which is the MTF curve of the lens in this embodiment, 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 at a spatial frequency of 140lp / mm, the MTF value of the lens within a 20-degree field of view of a half-field angle of view is above 0.25, indicating that the lens has a high resolution.

[0133] See also Figure 6 , which is a distortion diagram of the lens in this embodiment, the horizontal axis represents F-Tan (Theta) distortion (unit: %), and the vertical axis represents the half field angle (unit: °). It can be seen from the figure that the distortion of the lens is small and less than 10%, indicating that the distortion of the lens is well corrected.

[0134] See also Figure 7 , which is a diagram of the axial chromatic aberration of the lens in this embodiment, the horizontal axis represents the intersection position of the light and the optical axis (unit: mm), and the vertical axis represents different apertures of the lens. It can be seen from the figure that the axial chromatic aberration of the center of the wavelength 0.435μm-0.656μm is within 0.03mm, indicating that the aberration correction of the lens system is good and the axial chromatic aberration is small.

[0135] See also Figure 8 The MTF curve of the lens in this embodiment at a close distance of 8 meters is shown, with the horizontal axis representing the spatial frequency (unit: lp / mm) and the vertical axis representing the MTF value. It can be seen from the figure that the MTF value of the lens at a close distance of 8 meters is better, indicating that the lens also has a higher resolution at a close object distance.

[0136] See also Fig. 9 The figure shows the MTF curve of the lens in the infrared 850nm in this embodiment, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the lens is better under the infrared 850nm, indicating that the night vision effect of the lens is better.

[0137] See also Fig.10The MTF curve of the lens in this embodiment at a close distance of 8 meters in the infrared is shown, with the horizontal axis representing the spatial frequency (unit: lp / mm) and the vertical axis representing the MTF value. It can be seen from the figure that the MTF value of the lens is better at the infrared band of 850nm and at a close distance of 8 meters, indicating that the lens also has a higher resolution in the infrared and close object distance.

[0138] Example 2

[0139] Reference Fig.11 , Fig.12 As shown, they are respectively a schematic diagram of the optical structure and a schematic diagram of the optical path structure. In this embodiment, the total focal length of the lens is f=20 mm, the aperture value F#=1.0, the full image height IC=8.0 mm, the field of view angle DFOV=48°, the total optical length of the lens is TTL=159 mm, and the optical back focus of the lens system is OBFL=16.12 mm.

[0140] In this embodiment, the curvature radius (unit: mm), center thickness d (unit: mm), refractive index (ND) and Abbe constant (VD) of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the tenth lens 10 are as shown in Table 4.

[0141] Table 4

[0142] Surface number Curvature radius R Center thickness d Refractive index ND Abbe constant VD S1 42.82 10.49 1.77 49.61 S2 21.71 13.07 S3 -24.76 5.49 1.92 18.90 S4 179.16 4.85 S5 -163.68 17.24 1.88 39.23 S6 -41.97 3.09 S7 77.95 8.82 1.95 17.94 S8 -230.13 20.00 S9 Infinity 0.16 S10 56.91 10.57 1.74 44.90 S11 -37.97 2.29 1.81 25.48 S12 30.77 5.57 S13 61.02 2.00 1.81 25.48 S14 28.13 8.52 1.62 60.37 S15 -106.12 0.05 S16 34.46 20.00 1.59 68.53 S17 -50.68 2.56 S18 -53.62 8.00 1.62 36.35 S19 -77.95 3.25 S20 Infinity 0.70 1.52 64.21 S21 Infinity 12.17

[0143] In Table 4, as mentioned above, the radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane, where "Infinity" represents that the surface is a plane; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the current lens material to deflect light, and the Abbe number represents the dispersion characteristics of the current lens material to light.

[0144] refer to Fig.14 As shown, the relative illumination of the lens at the maximum field of view is greater than 50%, and sufficient light enters, ensuring that there will be no dark corners in the actual shot even when the lens is used in a dim environment.

[0145] See also Fig.15 , which is the MTF curve of the lens in this embodiment, 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 at a spatial frequency of 140lp / mm, the MTF value of the lens within a 20-degree field of view of a half-field angle of view is above 0.25, indicating that the lens has a high resolution.

[0146] See also Fig.16, which is a distortion diagram of the lens in this embodiment, the horizontal axis represents distortion (unit: %), and the vertical axis represents half field angle (unit: °). It can be seen from the figure that the distortion of the lens is small and less than 10%, indicating that the distortion of the lens is well corrected.

[0147] See also Fig.17 , which is a diagram of the axial chromatic aberration of the lens in this embodiment, wherein the horizontal axis represents the intersection position of the light and the optical axis (unit: mm), and the vertical axis represents different apertures of the lens. It can be seen from the figure that the axial chromatic aberration of the center of the wavelength 0.435μm-0.656μm is about 0.03mm, indicating that the aberration correction of the lens system is good and the axial chromatic aberration is small.

[0148] See also Fig.18 The MTF curve of the lens in this embodiment at a close distance of 8 meters is shown, with the horizontal axis representing the spatial frequency (unit: lp / mm) and the vertical axis representing the MTF value. It can be seen from the figure that the MTF value of the lens at a close distance of 8 meters is better, indicating that the lens also has a higher resolution at a close object distance.

[0149] See also Fig.19 The figure shows the MTF curve of the lens in the infrared 850nm in this embodiment, the horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. It can be seen from the figure that the MTF value of the lens is better under the infrared 850nm, indicating that the night vision effect of the lens is better.

[0150] See also Fig. 20 The MTF curve of the lens in this embodiment at a close distance of 8 meters in the infrared is shown, with the horizontal axis representing the spatial frequency (unit: lp / mm) and the vertical axis representing the MTF value. It can be seen from the figure that the MTF value of the lens is better at the infrared band of 850nm and at a close distance of 8 meters, indicating that the lens also has a higher resolution in the infrared and close object distance.

[0151] Example 3

[0152] Reference Fig.21 , Fig. 22 As shown, they are respectively a schematic diagram of the optical structure and a schematic diagram of the optical path structure. In this embodiment, the total focal length of the lens is f=20 mm, the aperture value F#=1.0, the full image height IC=8.0 mm, the field of view angle DFOV=48°, the total optical length of the lens TTL=123 mm, and the optical back focus of the lens system is OBFL=19.12 mm.

[0153] In this embodiment, the curvature radius (unit: mm), center thickness d (unit: mm), refractive index (ND) and Abbe constant (VD) of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9 and the ninth lens 10 are as shown in Table 5.

[0154] Table 5

[0155]

[0156]

[0157] In summary, the present invention adopts a 10-piece all-glass structure, the total focal length of the optical lens is f=20mm, and the aperture F# satisfies F#≤1.0. Under the large aperture and large focal length, the light aperture is relatively large, which can ensure the high relative illumination of the system, and there is no dark corner in the picture during shooting. At the same time, the system aberration is well corrected, and the optical performance is good. Moreover, after reasonable lens material selection, optical power distribution and optical design optimization, the present invention can be matched with 8MP, 1" chip to achieve 24-hour all-weather high-definition photography, excellent low-illumination effect, and clear real-shot pictures.

[0158] The above only expresses the preferred technical solution of the utility model, and its 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, and the utility model is also intended to include these modifications and modifications.

Claims

1. A 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens, characterized by: Set along the lens optical axis from the object side to the image side in order: A first lens, wherein the first lens is a glass lens with negative optical power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens, wherein the second lens is a glass lens with negative optical power, and the object side surface of the second lens is a concave surface, and the image side surface is a concave surface; A third lens, wherein the third lens is a glass lens with positive power, the object side surface of the third lens is a concave surface, and the image side surface is a convex surface; a fourth lens, wherein the fourth lens is a spherical glass lens with positive power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; Aperture diaphragm; A fifth lens, wherein the fifth lens is a spherical glass lens with positive refractive power, and the object side surface of the fifth lens is a convex surface, and the image side surface is a convex surface; a sixth lens, wherein the sixth lens is a glass lens with negative optical power, and the object-side surface of the sixth lens is a concave surface, and the image-side surface of the sixth lens is a concave surface; A seventh lens, wherein the seventh lens is a glass lens with negative optical power, the object side surface of the seventh lens is a convex surface, and the image side surface is a concave surface; an eighth lens, wherein the eighth lens is a glass lens with positive power, and the object-side surface of the eighth lens is a convex surface, and the image-side surface of the eighth lens is a convex surface; A ninth lens, wherein the ninth lens is a glass lens with positive power, and the object side surface of the ninth lens is a convex surface, and the image side surface is a convex surface; A tenth lens, wherein the tenth lens is a glass lens with negative optical power, and the object side surface of the ninth lens is a concave surface, and the image side surface is a convex surface; Optical filters; A protective glass and an image acquisition element, wherein the protective glass is integrated on the image acquisition element and is arranged on the image side of the filter; in, The image side surface of the fifth lens and the object side surface of the sixth lens are glued together to form a double glued lens; The image side surface of the seventh lens and the object side surface of the eighth lens are glued to each other to form a double glued lens.

2. The 20mm large aperture athermal high definition day and night dual-use internal focusing all-glass lens according to claim 1, characterized in that: The lens satisfies the following relationship: 0.05≤IC / TTL≤0.065 5.97≤TTL / f≤7.94 0.10≤OBFL / TTL≤0.16; In the relationship, f is the total focal length of the lens, TTL is the total optical length of the lens, OBFL is the optical back focus of the lens, and IC is the total image height of the chip matched with the lens system.

3. The 20mm large aperture athermal high definition day and night dual-use internal focusing all-glass lens according to claim 1, characterized in that: The lens also satisfies the following relationship: -3.62≤f1 / f≤-2.87, -1.15≤f2 / f≤-0.96, 2.03≤f3 / f≤2.98, 2.16≤f4 / f≤3.08, 1.28≤f5 / f≤1.60, -1.03≤f6 / f≤-0.83, -3.30≤f7 / f≤-2.20, 1.50≤f8 / f≤1.83, 1.54≤f9 / f≤1.89, -15.76≤f10 / f≤-10.81; In the relationship, f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, f9 is the focal length of the ninth lens, f10 is the focal length of the tenth lens, TTL is the total optical length of the lens, OBFL is the optical back focus of the lens, and IC is the total image height of the 1” inch chip matched with the lens system.

4. The 20mm large aperture athermal high definition day and night dual-use internal focusing all-glass lens according to claim 1, characterized in that: The focal length ranges corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are respectively -85.87 to -57.36, -27.05 to -16.23, +35.74 to +59.56, +36.97 to +61.62, +21.52 to +35.87, -23.44 to -14.07, -66.03 to -36.89, +25.25 to +42.09, +25.87 to +43.12, and -315.17 to -184.41; wherein the "+" sign indicates that the lens has a positive focal power, the "-" sign indicates that the lens has a negative focal power, and the unit of the focal length is mm.

5. The 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens according to claim 1, characterized in that: The refractive index ranges corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are 1.69-1.87, 1.84-2.03, 1.79-1.98, 1.86-2.06, 1.66-1.84, 1.72-1.90, 1.54-1.70, 1.52-1.67, 1.54-1.71 and 1.44-1.59 respectively.

6. The 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens according to claim 1, characterized in that: The object side surface curvature radius values ​​corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are respectively in the range of +26.17 to +43.62, -27.61 to -16.57, -164.05 to -85.19, +50.82 to +84.70, +4.07 to +73.46, -38.37 to -23.02, +60.56 to +100.93, +19.92 to +33.19, +24.06 to +40.11, and -54.07 to -29.28; The image-side surface curvature radii corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are respectively in the range of +13.89 to +23.16, +179.02 to +307.07, -42.99 to -24.59, -230.25 to -110.02, -38.37 to -23.02, +23.22 to +38.70, +19.92 to +33.19, -107.11 to -63.86, -62.51 to -37.51, and -78.05 to -41.15; wherein the "+" sign indicates that the surface is bent toward the image side, and the "-" sign indicates that the surface is bent toward the object side, and the unit of the curvature radius is mm.

7. The 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens according to claim 1, characterized in that: The total focal length of the lens is f, which satisfies f=20 mm.

8. The 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens according to claim 1, characterized in that: The aperture of the lens is F#, satisfying F#≤1.

0.

9. The 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens according to claim 1, characterized in that: The total optical length of the lens is TTL, satisfying TTL≤200mm.

10. The 20mm large aperture athermal high definition day and night dual-use internal focus all-glass lens according to claim 1, characterized in that: The seventh lens, the eighth lens, the ninth lens and the tenth lens constitute a built-in focusing lens group; the filter is made of H-K9L glass.

Images