Miniaturized high-resolution large-view-field lens for space

Abstract

The invention relates to a fixed-focus optical lens, in particular to a miniaturized high-resolution large-view-field lens for space, and aims to solve the problems that in the prior art, a traditional optical lens does not have the thermal vacuum passive compensation capability, is large in size and poor in imaging spatial resolution, and meanwhile, the size is large. In order to overcome the defect that the pixel size of a traditional large-view-field lens is large but the maximum resolution of the traditional large-view-field lens only reaches 90lp / mm, the miniaturized high-resolution large-view-field lens for the space comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are coaxially arranged in sequence, the eighth lens is arranged at a position close to the image surface; the first lens is an aspheric lens; the second lens and the first lens form a reverse telephoto structure, and the fifth lens and the sixth lens form a two-piece glued structure, so that the effects of compact structure and large field of view are achieved.

Description

Technical Field

[0001] The present invention relates to a fixed-focus optical lens, and particularly to a miniaturized high-resolution large-field-of-view lens for space use. Background Art

[0002] With the development of space technology, the demand for imaging measurement is increasing continuously, and the demand for miniaturized high-resolution large-field-of-view optical lenses is also getting higher and higher. With the development of detectors, the pixel size of detectors is getting smaller and smaller, and the types are also increasing. There are already some that can adapt to the complex irradiation and temperature environments in space. At the same time, many optical material manufacturers have begun to gradually mass-produce space radiation-resistant materials, providing more possibilities for the miniaturized design of lenses.

[0003] Traditional optical lenses do not have the ability of thermal vacuum passive compensation. Although the reported large-field-of-view lenses for space have the ability of passive compensation, in order to meet the space irradiation conditions, usually the first lens is made of quartz glass, which has a large volume and poor imaging space resolution. In addition, the pixel size of traditional large-field-of-view lenses is relatively large, and the maximum resolution of existing space large-field-of-view optical lenses only reaches 90 lp / mm.

[0004] Chinese Patent with Publication No. CN116125634A discloses a miniaturized high-resolution large-field-of-view lens for space, but this application does not disclose the curvature radii of each lens and the intervals between adjacent two lenses among each lens. According to the disclosed content, a lens optical system with a large field of view, high space resolution ability, and high imaging quality cannot be simulated. Therefore, the related technical problems such as poor imaging space resolution in the prior art and the resolution of large-field-of-view lenses only reaching 90 lp / mm still cannot be solved. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art that traditional optical lenses do not have the ability of thermal vacuum passive compensation, have a large volume, and poor imaging space resolution. At the same time, the pixel size of traditional large-field-of-view lenses is relatively large but the maximum resolution only reaches 90 lp / mm, and to provide a miniaturized high-resolution large-field-of-view lens for space use.

[0006] To achieve the above purpose, the technical solution provided by the present invention is as follows:

[0007] A miniaturized high-resolution large-field-of-view lens for space use, characterized in that: it includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged coaxially in sequence, and the eighth lens is arranged at a position close to the image plane;

[0008] The third lens, the fourth lens, the sixth lens, the seventh lens, and the eighth lens are positive lenses, and the first lens, the second lens, and the fifth lens are negative lenses;

[0009] The first lens is an aspherical lens; the second lens and the first lens form an inverse telephoto structure, and the fifth lens and the sixth lens form a two-piece cemented structure;

[0010] The front surface curvature radius of the first lens satisfies: 58.66 < curvature radius < 64.84;

[0011] The rear surface curvature radius of the first lens satisfies: 6.94 < curvature radius < 7.67;

[0012] The front surface curvature radius of the second lens satisfies: -12.07 < curvature radius < -13.34;

[0013] The rear surface curvature radius of the second lens satisfies: 5.74 < curvature radius < 6.35;

[0014] The front surface curvature radius of the third lens satisfies: 68.21 < curvature radius < 75.39;

[0015] The rear surface curvature radius of the third lens satisfies: -18.51 < curvature radius < -20.46;

[0016] The front surface curvature radius of the fourth lens satisfies: 7.21 < curvature radius < 7.97;

[0017] The rear surface curvature radius of the fourth lens satisfies: 23.46 < curvature radius < 25.92;

[0018] The front surface curvature radius of the fifth lens satisfies: -58.01 < curvature radius < -64.12;

[0019] The rear surface curvature radius of the fifth lens satisfies: 3.72 < curvature radius < 4.11;

[0020] The front surface curvature radius of the sixth lens satisfies: 3.72 < curvature radius < 4.11;

[0021] The rear surface curvature radius of the sixth lens satisfies: -13.99 < curvature radius < -15.46;

[0022] The front surface curvature radius of the seventh lens satisfies: 8.23 < curvature radius < 9.10;

[0023] The rear surface curvature radius of the seventh lens satisfies: -8.95 < curvature radius < -9.89;

[0024] The front surface curvature radius of the eighth lens satisfies: 7.87 < curvature radius < 8.70;

[0025] The radius of curvature of the rear surface of the eighth lens satisfies: 17.62 < radius of curvature < 19.47.

[0026] Furthermore, it also includes a diaphragm disposed between the fourth lens and the fifth lens;

[0027] The axial distance between the first lens and the second lens is 7.03 ± 0.3 mm;

[0028] The axial distance between the second lens and the third lens is 1.94 ± 0.3 mm;

[0029] The axial distance between the third lens and the fourth lens is 0.20 ± 0.2 mm;

[0030] The axial distance between the fourth lens and the diaphragm is 3.37 ± 0.3 mm;

[0031] The axial distance between the diaphragm and the fifth lens is 1.02 ± 0.2 mm;

[0032] The axial distance between the fifth lens and the sixth lens is 0;

[0033] The axial distance between the sixth lens and the seventh lens is 0.20 ± 0.2 mm;

[0034] The axial distance between the seventh lens and the eighth lens is 0.20 ± 0.2 mm.

[0035] Furthermore, the material of the first lens satisfies: refractive index > 1.75, Abbe number < 30, 85 < coefficient of thermal expansion < 95;

[0036] The material of the second lens satisfies: refractive index < 1.55, Abbe number > 65, 80 < coefficient of thermal expansion < 90;

[0037] The materials of the third lens and the fourth lens satisfy: refractive index > 1.90, Abbe number > 32, 70 < coefficient of thermal expansion < 80;

[0038] The material of the fifth lens satisfies: refractive index > 1.90, Abbe number < 30, 65 < coefficient of thermal expansion < 75;

[0039] The material of the sixth lens satisfies: refractive index > 1.70, Abbe number > 50, 60 < coefficient of thermal expansion < 65;

[0040] The materials of the seventh lens and the eighth lens satisfy: refractive index < 1.50, Abbe number > 80, 120 < coefficient of thermal expansion < 140.

[0041] Furthermore, the F-number is greater than or equal to 3.5.

[0042] Further, the thickness of the first lens is 2.5 mm ± 0.3 mm;

[0043] the thickness of the second lens is 1 mm ± 0.2 mm;

[0044] the thickness of the third lens is 1.68 mm ± 0.2 mm;

[0045] the thickness of the fourth lens is 1.84 mm ± 0.3 mm;

[0046] the thickness of the fifth lens is 1 mm ± 0.2 mm;

[0047] the thickness of the sixth lens is 1.83 mm ± 0.3 mm;

[0048] the thickness of the seventh lens is 2.09 mm ± 0.3 mm;

[0049] the thickness of the eighth lens is 1.61 mm ± 0.2 mm.

[0050] Further, the aspherical formula adopted by the first lens is that the standard polynomial is:

[0051]

[0052] where: Z is the height of the aspherical surface from the mounting end face; y is the radius of the lens profile; R is the curvature radius of the front surface of the first lens, 60 < R < 64; K is the second-order coefficient, K = 0; A, B, and C are the fourth-order, sixth-order, and eighth-order aspherical coefficients respectively, 0.0002 < A < 0.0003, -1.35×10 -6 <B<-1.3×10 -6 ,8.6×10 -9 <C<8.7×10 -9 。

[0053] Further, the optical power of the first lens satisfies: -0.31 < optical power / overall optical power < -0.25;

[0054] the optical power of the second lens satisfies: -0.45 < optical power / overall optical power < -0.37;

[0055] the optical power of the third lens satisfies: 0.21 < optical power / overall optical power < 0.18;

[0056] the optical power of the fourth lens satisfies: 0.26 < optical power / overall optical power < 0.32;

[0057] the optical power of the fifth lens satisfies: -0.95 < optical power / overall optical power < -0.78;

[0058] The optical power of the sixth lens satisfies: 0.66 < optical power / overall optical power < 0.81;

[0059] The optical power of the seventh lens satisfies: 0.30 < optical power / overall optical power < 0.37;

[0060] The optical power of the eighth lens satisfies: 0.10 < optical power / overall optical power < 0.12.

[0061] Furthermore, the front surface curvature radius of the first lens is 61.59, and the rear surface curvature radius is 7.28; the optical power / overall optical power is -0.28;

[0062] The front surface curvature radius of the second lens is -12.67, and the rear surface curvature radius is 6.03; the optical power / overall optical power is -0.41;

[0063] The front surface curvature radius of the third lens is 71.62, and the rear surface curvature radius is -19.43; the optical power / overall optical power is 0.19;

[0064] The front surface curvature radius of the fourth lens is 7.57, and the rear surface curvature radius is 24.63; the optical power / overall optical power is 0.29;

[0065] The front surface curvature radius of the fifth lens is -60.91, and the rear surface curvature radius is 3.91; the optical power / overall optical power is -0.86;

[0066] The front surface curvature radius of the sixth lens is 3.91, and the rear surface curvature radius is -14.69; the optical power / overall optical power is 0.73;

[0067] The front surface curvature radius of the seventh lens is 8.64, and the rear surface curvature radius is -9.40; the optical power / overall optical power is 0.33;

[0068] The front surface curvature radius of the eighth lens is 8.26, and the rear surface curvature radius is 18.50; the optical power / overall optical power is 0.11.

[0069] Furthermore, the distance between the front surface of the first lens and the object surface is 600 ± 100 mm;

[0070] The distance between the center position of the rear surface of the eighth lens and the image surface is 4.50 ± 0.02 mm.

[0071] Furthermore, the material of the first lens is HZF506;

[0072] The material of the second lens is DPK3;

[0073] The materials of the third lens and the fourth lens are HZLAF89L;

[0074] The material of the fifth lens is HZLAF90;

[0075] The material of the sixth lens is HLAK53A;

[0076] The materials of the seventh lens and the eighth lens are HFK61.

[0077] Advantages of the present invention:

[0078] 1. The first lens of the present invention adopts radiation-resistant heavy flint glass and has an aspherical structure, with strong anti-radiation ability, which can adapt to the space environment. Its aspherical structure makes the lens structure compact and has a large field of view. Through the combination of each lens, the spatial resolution of the lens can reach 180 lp / mm, far higher than that of general existing aerospace lenses, and has a high spatial resolution ability.

[0079] 2. The absolute values of the optical powers and the material thermal expansion coefficients of each optical lens group of the present invention are reasonably selected and can be mutually compensated under vacuum, high and low temperature conditions, with high adaptability to ground and space environments. The lens can maintain high imaging quality under normal temperature and pressure on the ground, normal temperature vacuum conditions, -40°C vacuum conditions, and 60°C vacuum conditions, and can realize ground assembly at normal temperature and pressure and alignment with the image plane. After reaching space, there is no need to realign the image plane.

[0080] 3. The present invention realizes a large field of view and higher spatial resolution through the mutual cooperation of parameters such as the curvature radii of each lens, the axial distances between adjacent lenses, and the materials of each lens.

[0081] 4. Through the unique parameter combination of eight lenses in the optical system of the present invention, the incident angle on the image plane can be less than 10°, the relative illumination on the image plane is uniform, and there will be no obvious darkening at the four corners, meeting the use requirements of most detectors; at the same time, the distortion generated by the lens is negative distortion (barrel distortion) and the absolute value of the maximum distortion is not greater than 5%, which is suitable for human eye observation and measurement applications. Description of the Drawings

[0082] Figure 1 is a structural schematic diagram of an embodiment of the present invention; (the aperture stop is not shown in the figure)

[0083] Figure 2 is the optical modulation transfer function diagram of the embodiment of the present invention under different conditions; among them, a is the optical modulation transfer function diagram of the optical system under normal temperature and pressure conditions; b is the optical modulation transfer function diagram of the optical system under normal temperature and vacuum conditions; c is the optical modulation transfer function diagram of the optical system under vacuum -40°C low temperature conditions; d is the optical modulation transfer function diagram of the optical system under vacuum 60°C high temperature conditions;

[0084] Figure 3 is the distortion curve of the optical system according to the embodiment of the present invention;

[0085] Figure 4 is the tolerance curve according to the embodiment of the present invention.

[0086] Explanation of reference numerals:

[0087] 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 - Image plane. Detailed implementation manners

[0088] A miniaturized high - resolution large - field - of - view lens for space use according to the present invention, as Figure 1 shown, includes eight lenses arranged coaxially in sequence, namely 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, and the eighth lens 8. When in use, the eighth lens 8 is arranged at a position close to the image plane 9, and the eight lenses are arranged in the form of negative - negative - positive - negative - positive - positive - positive. The first lens 1 is an aspherical lens, and the remaining lenses are all spherical lenses.

[0089] The aspherical formula adopted by the first lens 1 is a standard polynomial:

[0090]

[0091] where: Z is the height of the aspherical surface from the mounting end face; y is the radius of the lens profile; R is the curvature radius of the front surface of the first lens 1, preferably 60 < R < 64; K is the second - order coefficient, K = 0; A, B, and C are the fourth - order, sixth - order, and eighth - order aspherical coefficients respectively, 0.0002 < A < 0.0003, - 1.35×10 -6 < B < - 1.3×10 -6 , 8.6×10 -9 < C < 8.7×10 -9 .

[0092] The first lens 1 is made of heavy flint glass with strong radiation resistance, the refractive index > 1.75, the dispersion coefficient < 30, 85 < the expansion coefficient < 95. In this embodiment, the model of the first lens 1 is HZF506, the clear aperture ≤ 18mm, the thickness is 2.5mm ± 0.3mm, the optical power / overall optical power is - 0.28, the curvature radius of the front surface is specifically 61.59, and the curvature radius of the rear surface is 7.28. The first lens 1 has a high refractive index and a low dispersion coefficient, which can quickly converge light at the front end and introduce less chromatic aberration;

[0093] The refractive index of the second lens 2 < 1.55, the dispersion coefficient > 65, 80 < the expansion coefficient < 90. A phosphate crown lens, model DPK3, is used. The clear aperture of the second lens 2 ≤ 8 mm, the thickness is 1 mm ± 0.2 mm, the focal power / overall focal power is -0.41, the front surface radius of curvature is -12.67, and the rear surface radius of curvature is 6.03. Using a negative lens with a low refractive index and a high dispersion coefficient for the second lens 2 can effectively suppress the chromatic aberration of magnification, forming a retrofocus structure with the first lens 1, providing a basis for high-quality imaging.

[0094] Both the third lens 3 and the fourth lens 4 use heavy lanthanum flint, and the positive lens form is used to compensate for the residual chromatic aberration and offset part of the aberration caused by environmental changes. The refractive index of the third lens 3 and the fourth lens 4 > 1.9, the dispersion coefficient > 32, 70 < the expansion coefficient < 80. In this embodiment, the models are both HZLAF89L. The clear aperture of the third lens 3 ≤ 6.8 mm, the thickness is 1.68 mm ± 0.2 mm, the focal power / overall focal power is 0.19, the front surface radius of curvature is 71.62, and the rear surface radius of curvature is -19.43. The clear aperture of the fourth lens 4 ≤ 6.4 mm, the thickness is 1.84 mm ± 0.3 mm, the focal power / overall focal power is 0.29, the front surface radius of curvature is 7.57, and the rear surface radius of curvature is 24.63.

[0095] The fifth lens 5 and the sixth lens 6 use the forms of negative lens and positive lens respectively. The fifth lens 5 and the sixth lens 6 use a two-piece cemented structure to further eliminate chromatic aberration for the light rays behind the aperture stop. The refractive index of the fifth lens 5 > 1.9, the dispersion coefficient < 30, 65 < the expansion coefficient < 75. Heavy lanthanum flint is used, model HZLAF90. The clear aperture ≤ 3 mm, the thickness is 1 mm ± 0.2 mm, the focal power / overall focal power is -0.86, the front surface radius of curvature is -60.91, and the rear surface radius of curvature is 3.91. The refractive index of the sixth lens 6 > 1.7, the dispersion coefficient > 50, 60 < the expansion coefficient < 65. The material is an aperture crown, model HLAK53A. The clear aperture ≤ 3.3 mm, the thickness is 1.83 mm ± 0.3 mm, the focal power / overall focal power is 0.73, the front surface radius of curvature is 3.91, and the rear surface radius of curvature is -14.69.

[0096] Both the seventh lens 7 and the eighth lens 8 are made of lenses with low refractive index and high dispersion coefficient to effectively suppress magnification chromatic aberration, and both are positive lenses. The refractive index of the seventh lens 7 and the eighth lens 8 is < 1.5, the dispersion coefficient is > 80, 120 < expansion coefficient < 140, the material is fluorite crown glass, and the model is HFK61 for both; the clear aperture of the seventh lens 7 is ≤ 5 mm, the thickness is 2.09 mm ± 0.3 mm, the optical power / total optical power is 0.33, the front surface curvature radius is 8.64, and the rear surface curvature radius is -9.40; the clear aperture of the eighth lens 8 is ≤ 6 mm, the thickness is 1.61 mm ± 0.2 mm, the optical power / total optical power is 0.11, the front surface curvature radius is 8.26, and the rear surface curvature radius is 18.50.

[0097] In this embodiment, a diaphragm is further provided between the fourth lens 4 and the fifth lens 5, and the axial distances between the lenses satisfy the following relationships: the distance between the center position of the front surface of the first lens 1 and the object surface is 600 ± 100 mm, and the axial distance between the first lens 1 and the second lens 2 is 7.03 ± 0.3 mm; the axial distance between the second lens 2 and the third lens 3 is 1.94 ± 0.3 mm; the axial distance between the third lens 3 and the fourth lens 4 is 0.20 ± 0.2 mm; the axial distance between the fourth lens 4 and the diaphragm is 3.37 ± 0.3 mm; the axial distance between the diaphragm and the fifth lens 5 is 1.02 ± 0.2 mm; the axial distance between the fifth lens 5 and the sixth lens 6 is 0; the axial distance between the sixth lens 6 and the seventh lens 7 is 0.20 ± 0.2 mm; the axial distance between the seventh lens 7 and the eighth lens 8 is 0.20 ± 0.2 mm; the distance between the center position of the eighth lens 8 and the image plane 9 is 4.5 mm ± 0.02.

[0098] In this embodiment, the lens size is structurally compact, the focal length of the optical system is 3.1 mm, the minimum F number is 3.5, the diagonal field of view angle can reach more than 90°, having a large field of view; the spatial resolution can reach 180 lp / mm, far higher than that of general existing aerospace lenses, having a high spatial resolution ability. It can achieve clear imaging under normal temperature and pressure, normal temperature vacuum, -40° vacuum, and 60° vacuum conditions, as Figure 2 shown, where the abscissa is the spatial modulation frequency and the ordinate is the optical modulation function. It can be seen that under different conditions, the lens of the present invention has high imaging quality; Figure 3 is the distortion curve of the lens of the present invention, where the abscissa is the optical distortion percentage and the ordinate is the image height of the optical system. It can be seen that the absolute value of the maximum distortion of this optical system is not greater than 5%; Figure 4It is the tolerance curve of the lens of the present invention. Under the existing tolerance conditions, the transfer function of the full field of view can be greater than 0.1@180 lp / mm with an 80% probability, and the center field of view can be greater than 0.3, 8@180 lp / mm. This system has high processability.

[0099] Combined with the development of current detector technology and the requirements of practical applications, the present invention has carried out the design of a miniaturized high-resolution large-field optical lens on the basis of referring to new radiation-resistant glass materials. Instead of using thick quartz with a low refractive index as the first lens 1 to absorb space radiation, an aspherical lens is adopted for the first lens 1 to further reduce the volume of the lens, effectively controlling the distortion of the lens, so that the absolute value of the maximum distortion within the full field of view ≤ 5%. At the same time, materials are reasonably matched to make the spatial resolution of the entire small lens meet the usage requirements of 180 lp / mm, and it has the ability of passive thermal vacuum compensation.

Claims

1. A miniaturized, high-resolution, large-field-of-view lens for space use, characterized by: The invention comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7) and an eighth lens (8) which are coaxially arranged in sequence, wherein the eighth lens (8) is arranged at a position close to an image plane (9); The third lens (3), the fourth lens (4), the sixth lens (6), the seventh lens (7) and the eighth lens (8) are positive lenses, and the first lens (1), the second lens (2) and the fifth lens (5) are negative lenses; The first lens (1) is an aspheric lens; the second lens (2) and the first lens (1) form an anti-telephoto structure; the fifth lens (5) and the sixth lens (6) form a two-piece cemented structure; The curvature radius of the front surface of the first lens (1) satisfies: 58.66<curvature radius<64.84; The curvature radius of the rear surface of the first lens (1) satisfies: 6.94<curvature radius<7.67; The curvature radius of the front surface of the second lens (2) satisfies: -12.07<curvature radius<-13.34; The curvature radius of the rear surface of the second lens (2) satisfies: 5.74<curvature radius<6.35; The curvature radius of the front surface of the third lens (3) satisfies: 68.21<curvature radius<75.39; The curvature radius of the rear surface of the third lens (3) satisfies: -18.51<curvature radius<-20.46; The curvature radius of the front surface of the fourth lens (4) satisfies: 7.21 < curvature radius < 7.97; The curvature radius of the rear surface of the fourth lens (4) satisfies: 23.46<curvature radius<25.92; The front surface curvature radius of the fifth lens (5) satisfies: -58.01<curvature radius<-64.12; The curvature radius of the rear surface of the fifth lens (5) satisfies: 3.72<curvature radius<4.11; The curvature radius of the front surface of the sixth lens (6) satisfies: 3.72<curvature radius<4.11; The curvature radius of the rear surface of the sixth lens (6) satisfies: -13.99 < curvature radius < -15.46; The curvature radius of the front surface of the seventh lens (7) satisfies: 8.23 < curvature radius < 9.10; The curvature radius of the rear surface of the seventh lens (7) satisfies: -8.95 < curvature radius < -9.89; The curvature radius of the front surface of the eighth lens (8) satisfies: 7.87<curvature radius<8.70; The curvature radius of the rear surface of the eighth lens (8) satisfies: 17.62<curvature radius<19.

47.

2. The miniaturized, high-resolution, large-field-of-view lens for space use according to claim 1, characterized in that: Also included is a stop disposed between the fourth lens (4) and the fifth lens (5); The axial distance between the first lens (1) and the second lens (2) is 7.03±0.3 mm; The axial distance between the second lens (2) and the third lens (3) is 1.94±0.3 mm; The axial distance between the third lens (3) and the fourth lens (4) is 0.20 ± 0.2 mm; The axial distance between the fourth lens (4) and the aperture stop is 3.37 ± 0.3 mm; The axial distance between the aperture stop and the fifth lens (5) is 1.02 ± 0.2 mm; The axial distance between the fifth lens (5) and the sixth lens (6) is 0; The axial distance between the sixth lens (6) and the seventh lens (7) is 0.20 ± 0.2 mm; The axial distance between the seventh lens (7) and the eighth lens (8) is 0.20 ± 0.2 mm.

3. A small-sized, high-resolution, large field-of-view lens for space use according to claim 2, wherein: The material of the first lens (1) satisfies: refractive index > 1.75, Abbe number < 30, 85 < coefficient of thermal expansion < 95; The material of the second lens (2) satisfies: refractive index < 1.55, Abbe number > 65, 80 < coefficient of thermal expansion < 90; The materials of the third lens (3) and the fourth lens (4) satisfy: refractive index > 1.90, Abbe number > 32, 70 < coefficient of thermal expansion < 80; The material of the fifth lens (5) satisfies: refractive index > 1.90, Abbe number < 30, 65 < coefficient of thermal expansion < 75; The material of the sixth lens (6) satisfies: refractive index > 1.70, Abbe number > 50, 60 < coefficient of thermal expansion < 65; The materials of the seventh lens (7) and the eighth lens (8) satisfy: refractive index < 1.50, Abbe number > 80, 120 < coefficient of thermal expansion < 140.

4. A small-sized, high-resolution, large field-of-view lens for space use according to claim 3, wherein: The F-number is greater than or equal to 3.

5.

5. A small-sized, high-resolution, large field-of-view lens for space use according to claim 4, wherein: The thickness of the first lens (1) is 2.5 mm ± 0.3 mm; The thickness of the second lens (2) is 1 mm ± 0.2 mm; The thickness of the third lens (3) is 1.68 mm ± 0.2 mm; The thickness of the fourth lens (4) is 1.84 mm ± 0.3 mm; The thickness of the fifth lens (5) is 1 mm ± 0.2 mm; The thickness of the sixth lens (6) is 1.83 mm ± 0.3 mm; The thickness of the seventh lens (7) is 2.09 mm ± 0.3 mm; The thickness of the eighth lens (8) is 1.61 mm ± 0.2 mm.

6. A small-sized, high-resolution, large field-of-view lens for space use according to any one of claims 1-5, wherein: The aspheric formula adopted by the first lens (1) is a standard polynomial: Where: Z is the height of the aspherical surface from the mounting end face; y is the lens profile radius; R is the curvature radius of the front surface of the first lens (1), 60 < R < 64; K is the second-order coefficient, K = 0; A, B, and C are the fourth-order, sixth-order, and eighth-order aspherical coefficients respectively, 0.0002 < A < 0.0003, -1.35×10 -6 < B < -1.3×10 -6 , 8.6×10 -9 < C < 8.7×10 -9 .

7. A small-sized, high-resolution, large field-of-view lens for space use according to claim 6, wherein: The optical power of the first lens (1) satisfies: -0.31 < optical power / overall optical power < -0.25; The optical power of the second lens (2) satisfies: -0.45 < optical power / overall optical power < -0.37; The optical power of the third lens (3) satisfies:

0. 21 < optical power / overall optical power < 0.18; The optical power of the fourth lens (4) satisfies: 0.26 < optical power / overall optical power < 0.32; The optical power of the fifth lens (5) satisfies: -0.95 < optical power / overall optical power < -0.78; The optical power of the sixth lens (6) satisfies: 0.66 < optical power / overall optical power < 0.81; The optical power of the seventh lens (7) satisfies: 0.30 < optical power / overall optical power < 0.37; The optical power of the eighth lens (8) satisfies: 0.10 < optical power / overall optical power < 0.

12.

8. The miniaturized high-resolution large field-of-view lens for space according to claim 7, characterized in that: The front surface curvature radius of the first lens (1) is 61.59, and the rear surface curvature radius is 7.28; the optical power / overall optical power is -0.28; The front surface curvature radius of the second lens (2) is -12.67, and the rear surface curvature radius is 6.03; the optical power / overall optical power is -0.41; The front surface curvature radius of the third lens (3) is 71.62, and the rear surface curvature radius is -19.43; the optical power / overall optical power is 0.19; The front surface curvature radius of the fourth lens (4) is 7.57, and the rear surface curvature radius is 24.63; the optical power / overall optical power is 0.29; The front surface curvature radius of the fifth lens (5) is -60.91, and the rear surface curvature radius is 3.91; the optical power / overall optical power is -0.86; The front surface curvature radius of the sixth lens (6) is 3.91, and the rear surface curvature radius is -14.69; the optical power / overall optical power is 0.73; The front surface curvature radius of the seventh lens (7) is 8.64, and the rear surface curvature radius is -9.40; the optical power / overall optical power is 0.33; The front surface curvature radius of the eighth lens (8) is 8.26, and the rear surface curvature radius is 18.50; the optical power / overall optical power is 0.

11.

9. The miniaturized high-resolution large field-of-view lens for space according to claim 8, characterized in that: The distance between the front surface of the first lens (1) and the object surface is 600 ± 100 mm; The distance between the center position of the rear surface of the eighth lens (8) and the image surface (9) is 4.50 ± 0.02 mm.

10. The miniaturized high-resolution large field-of-view lens for space according to claim 9, characterized in that: The material of the first lens (1) is HZF506; The material of the second lens (2) is DPK3; The materials of the third lens (3) and the fourth lens (4) are HZLAF89L; The material of the fifth lens (5) is HZLAF90; The material of the sixth lens (6) is HLAK53A; The materials of the seventh lens (7) and the eighth lens (8) are HFK61.

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