Optical lens for high speed aircraft observation

Abstract

The application discloses an optical lens for high-speed aircraft observation, and solves the problem of asymmetric horizontal and vertical aberrations after a first lens of a camera device of an existing high-speed aircraft is designed as a cylindrical structure.The optical lens comprises a first lens, a reflecting mirror arranged on an outgoing light path of the first lens, and a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence on a reflected light path of the reflecting mirror, wherein the first lens is a positive crescent cylindrical mirror, so that the whole lens has good aerodynamic characteristics, the whole light path is folded by the reflecting mirror, and the optical lens is suitable for a tail fin installation working condition and has good adaptability; the fifth lens is a negative crescent cylindrical mirror, so as to compensate for the asymmetric horizontal and vertical aberrations caused by the first lens, and the image quality is restored after optimization of the fifth lens.

Description

Technical Field

[0001] This invention relates to optical lenses, and more specifically to an optical lens for observation of high-speed aircraft. Background Technology

[0002] With the development of aerospace technology, the speed of aircraft is constantly increasing, and the monitoring and measurement of the flight status of aircraft is becoming increasingly important. However, due to the high speed of high-speed aircraft during flight, their aerodynamic shape is more constrained, which brings great challenges to the design and installation of optical observation equipment used for monitoring.

[0003] To better acquire global image information of an aircraft, it is generally necessary to embed and install camera devices in the tail or rudder positions. These positions have extremely high aerodynamic requirements, requiring the optical lens group of the camera device to be designed in a near-cylindrical form. However, the optical lens group in a typical camera device adopts a centrally symmetrical structure. In order to adapt to the aerodynamic shape of the aircraft, some researchers have designed the first lens of the optical lens group to be a cylindrical structure. However, after adopting this structure, the problem of horizontal and vertical asymmetry will occur, affecting the image quality. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problem of horizontal and vertical aberration asymmetry in existing high-speed aircraft camera devices after the first lens is designed as a cylindrical structure, and to provide an optical lens for high-speed aircraft observation.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0006] An optical lens for observing high-speed aircraft, which is special in that:

[0007] It includes a first lens, a reflector disposed in the output light path of the first lens, and a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens disposed sequentially in the reflection light path of the reflector.

[0008] The first lens is a positive meniscus lens with its convex surface facing away from the reflecting mirror; the second lens is a positive meniscus lens with its convex surface facing the reflecting mirror; the third lens is a biconcave lens; the fourth lens is a negative meniscus lens with its convex surface facing the fifth lens; the fifth lens is a negative meniscus lens with its convex surface facing the sixth lens; the sixth lens is a positive meniscus lens with its convex surface facing the fifth lens; the seventh lens is a biconvex lens; the eighth lens is a biconvex lens; and the ninth lens is a negative meniscus lens with its convex surface facing away from the eighth lens.

[0009] The optical path distance D1 between the exit surface of the first lens and the incident surface of the reflecting mirror on the optical axis satisfies 3mm≤D1≤5mm;

[0010] An optical path distance D2 on the optical axis between the exit surface of the reflecting mirror and the incident surface of the second lens satisfies 0.1mm≤D2≤1mm;

[0011] An optical path distance D3 on the optical axis between the exit surface of the second lens and the incident surface of the third lens satisfies 1mm≤D3≤2mm;

[0012] An optical path distance D4 on the optical axis between the exit surface of the third lens and the incident surface of the fourth lens satisfies 5mm≤D4≤6mm;

[0013] An optical path distance D5 on the optical axis between the exit surface of the fourth lens and the incident surface of the fifth lens satisfies 3mm≤D5≤4mm;

[0014] An optical path distance D6 on the optical axis between the exit surface of the fifth lens and the incident surface of the sixth lens satisfies 60mm≤D6≤61mm;

[0015] An optical path distance D7 on the optical axis between the exit surface of the sixth lens and the incident surface of the seventh lens satisfies 0.1mm≤D7≤1mm;

[0016] An optical path distance D8 on the optical axis between the exit surface of the seventh lens and the incident surface of the eighth lens satisfies 24mm≤D8≤25mm;

[0017] An optical path distance D9 on the optical axis between the exit surface of the eighth lens and the incident surface of the ninth lens satisfies 0.1mm≤D9≤1mm.

[0018] Further, the meridional radius of curvature R11 of the incident surface of the first lens is 28mm, and the meridional radius of curvature R12 of the exit surface of the first lens is 21.715mm;

[0019] The sagittal radius of curvature R21 of the incident surface of the second lens satisfies -280mm<R21<-270mm, and the sagittal radius of curvature R22 of the exit surface of the second lens satisfies -9mm<R22<-8mm;

[0020] The sagittal radius of curvature R31 of the incident surface of the third lens satisfies 40mm<R31<50mm, and the sagittal radius of curvature R32 of the exit surface of the third lens satisfies -230mm<R32<-220mm;

[0021] The sagittal radius of curvature R41 of the incident surface of the fourth lens satisfies 10mm<R41<12mm, and the sagittal radius of curvature R42 of the exit surface of the fourth lens satisfies 10mm<R42<11mm;

[0022] The meridional radius of curvature R51 of the incident surface of the fifth lens is 12mm, and the meridional radius of curvature R52 of the exit surface of the fifth lens is 16mm;

[0023] The sagittal curvature radius R61 of the incident surface of the sixth lens satisfies -15mm < R61 < -13mm, and the sagittal curvature radius R62 of the exit surface of the sixth lens satisfies -13mm < R62 < -10mm;

[0024] The sagittal curvature radius R71 of the incident surface of the seventh lens satisfies -15mm < R71 < -13mm, and the sagittal curvature radius R72 of the exit surface of the seventh lens satisfies 200mm < R62 < 210mm;

[0025] The sagittal curvature radius R81 of the incident surface of the eighth lens satisfies -15mm < R81 < -13mm, and the sagittal curvature radius R82 of the exit surface of the eighth lens satisfies 13mm < R62 < 15mm;

[0026] The sagittal curvature radius R91 of the incident surface of the ninth lens satisfies 10mm < R91 < 13mm, and the sagittal curvature radius R92 of the exit surface of the ninth lens satisfies 20mm < R62 < 25mm.

[0027] Further, a diaphragm is also included;

[0028] The diaphragm is arranged on the optical path between the fifth lens and the sixth lens, and is arranged close to the incident surface of the sixth lens.

[0029] Further, the reflector is a 45° axially-folding prism.

[0030] Further, the central thickness H1 of the first lens is 20mm;

[0031] The central thickness H2 of the second lens satisfies 1.5mm ≤ H2 ≤ 2mm;

[0032] The central thickness H3 of the third lens satisfies 3mm ≤ H3 ≤ 4mm;

[0033] The central thickness H4 of the fourth lens satisfies 3mm ≤ H4 ≤ 4mm;

[0034] The central thickness H5 of the fifth lens is 5mm;

[0035] The central thickness H6 of the sixth lens satisfies 3.5mm ≤ H6 ≤ 4mm;

[0036] The central thickness H7 of the seventh lens satisfies 3mm ≤ H7 ≤ 4mm;

[0037] The central thickness H8 of the eighth lens satisfies 2mm ≤ H8 ≤ 3mm;

[0038] The central thickness H9 of the ninth lens satisfies 3mm ≤ H9 ≤ 4mm.

[0039] Furthermore, the refractive index n1 of the first lens is 1.458;

[0040] The refractive index n2 of the second lens satisfies 1.89. <n2<1.92;

[0041] The refractive index n3 of the third lens satisfies 1.89. <n3<1.92;

[0042] The refractive index n4 of the fourth lens satisfies 1.8. <n4<1.85

[0043] The refractive index n5 of the fifth lens is 1.458;

[0044] The refractive index n6 of the sixth lens satisfies 1.90. <n6<1.95;

[0045] The refractive index n7 of the seventh lens satisfies 1.45. <n7<1.55;

[0046] The refractive index n8 of the eighth lens satisfies 1.45. <n8<1.55;

[0047] The refractive index n9 of the ninth lens satisfies 1.90. <n9<1.95;

[0048] The refractive index n10 of the mirror satisfies 1.50 < n10 < 1.53.

[0049] Furthermore, the dispersion coefficient v1 of the first lens is 67.8;

[0050] The dispersion coefficient v2 of the second lens satisfies 30 <v2<40;

[0051] The dispersion coefficient v3 of the third lens satisfies 30 <v3<40;

[0052] The dispersion coefficient v4 of the fourth lens satisfies 25 <v4<30;

[0053] The dispersion coefficient v5 of the fifth lens is 67.8;

[0054] The dispersion coefficient v6 of the sixth lens satisfies 15. <v6<20;

[0055] The dispersion coefficient v7 of the seventh lens satisfies 75. <v7<85;

[0056] The dispersion coefficient v8 of the eighth lens satisfies 75. <v8<85;

[0057] The dispersion coefficient v9 of the ninth lens satisfies 20 <v9<25;

[0058] The dispersion coefficient v10 of the reflector satisfies 60. <v10<65。

[0059] Furthermore, the optical path distance D1 between the exit surface of the first lens and the incident surface of the reflecting mirror on the optical axis is 4 mm;

[0060] The optical path distance D2 between the exit surface of the reflector and the incident surface of the second lens on the optical axis is 0.2 mm;

[0061] The optical path distance D3 between the exit surface of the second lens and the incident surface of the third lens on the optical axis is 1.676 mm;

[0062] The optical path distance D4 between the exit surface of the third lens and the incident surface of the fourth lens on the optical axis is 5.205 mm;

[0063] The optical path distance D5 between the exit surface of the fourth lens and the incident surface of the fifth lens on the optical axis is 3.262 mm.

[0064] The optical path distance D6 between the exit surface of the fifth lens and the incident surface of the sixth lens on the optical axis is 60.2 mm;

[0065] The optical path distance D7 between the exit surface of the sixth lens and the incident surface of the seventh lens on the optical axis is 0.919 mm.

[0066] The optical path distance D8 between the exit surface of the seventh lens and the incident surface of the eighth lens on the optical axis is 24.76 mm.

[0067] The optical path distance D9 between the exit surface of the eighth lens and the incident surface of the ninth lens on the optical axis is 0.805 mm.

[0068] The sagittal radius of curvature R21 of the incident surface of the second lens is -279.5426 mm, and the sagittal radius of curvature R22 of the exit surface is -8.71365 mm.

[0069] The incident surface of the third lens has a sagittal curvature radius R31 of 47.6077 mm, and the exit surface has a sagittal curvature radius R32 of -228.8238 mm.

[0070] The incident surface of the fourth lens has a sagittal radius of curvature R41 of 11.23139 mm, and the exit surface has a sagittal radius of curvature R42 of 10.4560 mm.

[0071] The incident surface of the sixth lens has a sagittal radius of curvature R61 of -13.7438 mm, and the exit surface has a sagittal radius of curvature R62 of -10.8017 mm.

[0072] The radius of curvature R71 of the incident surface of the seventh lens is -14.4226 mm, and the radius of curvature R72 of the exit surface is 207.5593 mm.

[0073] The incident surface of the eighth lens has a sagittal radius of curvature R81 of -12.8971 mm, and the exit surface has a sagittal radius of curvature R82 of 13.5431 mm.

[0074] The incident surface of the ninth lens has a sagittal curvature radius R91 of 12.0324 mm, and the exit surface has a sagittal curvature radius R92 of 23.8580 mm.

[0075] Furthermore, the center thickness H2 of the second lens is 1.5 mm;

[0076] The center thickness H3 of the third lens is 3.5 mm;

[0077] The center thickness H4 of the fourth lens is 3.5 mm;

[0078] The center thickness H6 of the sixth lens is 3.5 mm;

[0079] The center thickness H7 of the seventh lens is 3.5 mm;

[0080] The center thickness H8 of the eighth lens is 2.174 mm;

[0081] The center thickness H9 of the ninth lens is 3.5 mm;

[0082] Furthermore, the refractive index n2 of the second lens is 1.910826;

[0083] The refractive index n3 of the third lens is 1.910826;

[0084] The refractive index n4 of the fourth lens is 1.846817;

[0085] The refractive index n6 of the sixth lens is 1.925611;

[0086] The refractive index n7 of the seventh lens is 1.496851;

[0087] The refractive index n8 of the eighth lens is 1.496998;

[0088] The refractive index n9 of the ninth lens is 1.929815;

[0089] The refractive index n10 of the mirror is 1.516800.

[0090] The dispersion coefficient v2 of the second lens is 35.26;

[0091] The dispersion coefficient v3 of the third lens is 35.26;

[0092] The dispersion coefficient v4 of the fourth lens is 29.47;

[0093] The dispersion coefficient v6 of the sixth lens is 18.26;

[0094] The dispersion coefficient v7 of the seventh lens is 81.4;

[0095] The dispersion coefficient v8 of the eighth lens is 81.59;

[0096] The dispersion coefficient v9 of the ninth lens is 23.04;

[0097] The dispersion coefficient v10 of the mirror is 64.2.

[0098] Compared with the prior art, the present invention has the following beneficial technical effects:

[0099] 1. The present invention provides an optical lens for high-speed aircraft observation, comprising a first lens, a reflector disposed on the output optical path of the first lens, and a second, third, fourth, fifth, sixth, seventh, eighth, and ninth lens disposed sequentially on the reflected optical path of the reflector. The first lens is a positive meniscus mirror, which gives the entire lens good aerodynamic characteristics. The use of a reflector enables the entire optical path to be folded, making it suitable for aircraft tail fin installation conditions. The overall shape of the optical lens is well adaptable. By setting the fifth lens as a negative meniscus mirror, the asymmetric horizontal and vertical aberrations caused by the introduction of the first lens are compensated. After optimization by the fifth lens, the image quality is restored.

[0100] 2. The reflector of the optical lens for high-speed aircraft observation provided by the present invention adopts a 45° folded-axis prism. The use of a folded-axis prism is beneficial to reducing the front end size of the optical lens. Attached Figure Description

[0101] Figure 1 This is an optical path diagram of an embodiment of an optical lens for high-speed aircraft observation according to the present invention;

[0102] Figure 2 This is a modulation transfer function diagram according to an embodiment of the present invention;

[0103] Figure 3 This is a field distortion curve diagram of an embodiment of the present invention.

[0104] The annotations in the attached figures are explained as follows:

[0105] 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-Reflecting mirror, 11-Focal plane, 12-Aperture stop. Detailed Implementation

[0106] To make the objectives, advantages, and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0107] like Figures 1-3 As shown, this embodiment provides an optical lens for high-speed aircraft observation, including a first lens 1, a reflector 10 disposed on the output optical path of the first lens 1, and a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9 disposed sequentially on the reflection optical path of the reflector 10.

[0108] The first lens 1 is a positive meniscus lens with its convex surface facing away from the reflecting mirror 10; the reflecting mirror 10 uses a 45° folded-axis prism, which helps to reduce the front-end size of the entire optical system; the second lens 2 is a positive meniscus lens with its convex surface facing the reflecting mirror 10; the third lens 3 is a biconcave lens; the fourth lens 4 is a negative meniscus lens with its convex surface facing the fifth lens 5; the fifth lens 5 is a negative meniscus lens with its convex surface facing the sixth lens 6, and the fifth lens 5 is used to compensate for the asymmetric horizontal and vertical aberrations caused by the introduction of the first lens 1; the sixth lens 6 is a positive meniscus lens with its convex surface facing the fifth lens 5; the seventh lens 7 is a biconvex lens; the eighth lens 8 is a biconvex lens; the ninth lens 9 is a negative meniscus lens with its convex surface facing away from the eighth lens 8.

[0109] The entire optical lens also includes an aperture stop 12, which is set in the optical path between the fifth lens 5 and the sixth lens 6, and is set close to the incident surface of the sixth lens 6. In this way, the fifth lens 5 is set at the pupil position, which can better compensate for the asymmetric horizontal and vertical aberrations caused by the introduction of the first lens 1.

[0110] After light enters through the first lens 1, it is reflected by the mirror 10 and then passes sequentially through the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the aperture 12, the sixth lens 6, the seventh lens 7, the eighth lens 8, and the ninth lens 9, finally focusing on the focal plane 11.

[0111] Considering the aerodynamic shape and high-temperature operating conditions of high-speed aircraft, the first lens 1 is made of high-temperature resistant quartz material, and the fifth lens 5 is also made of high-temperature resistant quartz material. In the entire optical lens, except for the first lens 1, the fifth lens 5 and the reflecting mirror 10, the remaining lenses are all spherical mirrors.

[0112] The optical path distance D1 between the exit surface of the first lens 1 and the incident surface of the reflector 10 on the optical axis satisfies 3mm ≤ D1 ≤ 5mm; the optical path distance D2 between the exit surface of the reflector 10 and the incident surface of the second lens 2 on the optical axis satisfies 0.1mm ≤ D2 ≤ 1mm; the optical path distance D3 between the exit surface of the second lens 2 and the incident surface of the third lens 3 on the optical axis satisfies 1mm ≤ D3 ≤ 2mm; the optical path distance D4 between the exit surface of the third lens 3 and the incident surface of the fourth lens 4 on the optical axis satisfies 5mm ≤ D4 ≤ 6mm; the optical path distance D1 between the exit surface of the fourth lens 4 and the incident surface of the fifth lens 5 on the optical axis satisfies 3mm ≤ D1 ≤ 5mm; The optical path distance D5 satisfies 3mm≤D5≤4mm; the optical path distance D6 between the exit surface of the fifth lens 5 and the incident surface of the sixth lens 6 on the optical axis satisfies 60mm≤D6≤61mm; the optical path distance D7 between the exit surface of the sixth lens 6 and the incident surface of the seventh lens 7 on the optical axis satisfies 0.1mm≤D7≤1mm; the optical path distance D8 between the exit surface of the seventh lens 7 and the incident surface of the eighth lens 8 on the optical axis satisfies 24mm≤D8≤25mm; and the optical path distance D9 between the exit surface of the eighth lens 8 and the incident surface of the ninth lens 9 on the optical axis satisfies 0.1mm≤D9≤1mm.

[0113] Since the first lens 1 and the fifth lens 5 are cylindrical mirrors, the radius of curvature is limited by the meridional radius of curvature. The meridional radius of curvature R11 of the incident surface of the first lens 1 is 28 mm, and the meridional radius of curvature R12 of the exit surface is 21.715 mm; the meridional radius of curvature R51 of the incident surface of the fifth lens 5 is 12 mm, and the meridional radius of curvature R52 of the exit surface is 16 mm.

[0114] The remaining lenses are ordinary spherical mirrors, whose meridional radius of curvature is the same as their sagittal radius of curvature. In this embodiment, the sagittal radius of curvature is used to limit the curvature.

[0115] The sagittal curvature radius R21 of the incident surface of the second lens 2 satisfies -280mm<R21<-270mm, and the sagittal curvature radius R22 of the exit surface satisfies -9mm<R22<-8mm; the sagittal curvature radius R31 of the incident surface of the third lens 3 satisfies 40mm<R31<50mm, and the sagittal curvature radius R32 of the exit surface satisfies -230mm<R32 <-220mm; the sagittal curvature radius R41 of the incident surface of the fourth lens 4 satisfies 10mm<R41<12mm, and the sagittal curvature radius R42 of the exit surface satisfies 10mm<R42<11mm; the sagittal curvature radius R61 of the incident surface of the sixth lens 6 satisfies -15mm<R61<-13mm, and the sagittal curvature radius R62 of the exit surface satisfies -13mm<R62<-10mm; the sagittal curvature radius R71 of the incident surface of the seventh lens 7 satisfies -15mm<R71<-13mm, and the sagittal curvature radius R72 of the exit surface satisfies 200mm<R62<210mm; the sagittal curvature radius R81 of the incident surface of the eighth lens 8 satisfies -15mm<R81<-13mm, and the sagittal curvature radius R82 of the exit surface satisfies 13mm<R82<15mm; the sagittal curvature radius R91 of the incident surface of the ninth lens 9 satisfies 10mm<R91<13mm, and the sagittal curvature radius R92 of the exit surface satisfies 20mm<R62<25mm.

[0116] The central thickness H1 of the first lens 1 is 20mm; the central thickness H2 of the second lens 2 satisfies 1.5mm≤H2≤2mm; the central thickness H3 of the third lens 3 satisfies 3mm≤H3≤4mm; the central thickness H4 of the fourth lens 4 satisfies 3mm≤H4≤4mm; the central thickness H5 of the fifth lens 5 is 5mm; the central thickness H6 of the sixth lens 6 satisfies 3.5mm≤H6≤4mm; the central thickness H7 of the seventh lens 7 satisfies 3mm≤H7≤4mm; the central thickness H8 of the eighth lens 8 satisfies 2mm≤H8≤3mm; the central thickness H9 of the ninth lens 9 satisfies 3mm≤H9≤4mm.

[0117] Since the materials of the first lens 1 and the fifth lens 5 have been determined, their refractive indices and dispersion coefficients are also determined. The refractive index n1 of the first lens 1 and the refractive index n5 of the fifth lens 5 are both 1.458, and the dispersion coefficient v1 of the first lens 1 and the dispersion coefficient v5 of the fifth lens 5 are both 67.8.

[0118] The refractive index n2 of the second lens 2 satisfies 1.89 < n2 < 1.92; the refractive index n3 of the third lens 3 satisfies 1.89 < n3 < 1.92, the refractive index n4 of the fourth lens 4 satisfies 1.8 < n4 < 1.85; the refractive index n6 of the sixth lens 6 satisfies 1.90 < n6 < 1.95; the refractive index n7 of the seventh lens 7 satisfies 1.45 < n7 < 1.55; the refractive index n8 of the eighth lens 8 satisfies 1.45 < n8 < 1.55; the refractive index n9 of the ninth lens 9 satisfies 1.90 < n9 < 1.95;

[0119] The refractive index n10 of the reflector 10 satisfies 1.50 < n10 < 1.53.

[0120] The Abbe number v2 of the second lens 2 satisfies 30 < v2 < 40; the Abbe number v3 of the third lens 3 satisfies 30 < v3 < 40; the Abbe number v4 of the fourth lens 4 satisfies 25 < v4 < 30; the Abbe number v6 of the sixth lens 6 satisfies 15 < v6 < 20; the Abbe number v7 of the seventh lens 7 satisfies 75 < v7 < 85; the Abbe number v8 of the eighth lens 8 satisfies 75 < v8 < 85; the Abbe number v9 of the ninth lens 9 satisfies 20 < v9 < 25; the Abbe number v10 of the reflector 10 satisfies 60 < v10 < 65.

[0121] Specific parameters of each lens in this embodiment are shown in Table 1:

[0122] Table 1

[0123]

[0124] Note: Taking the second lens 2 as an example in the description of the "Material (Refractive Index / Dispersion)" column, the corresponding table data is 910826.3526, which indicates that the refractive index is 1.910826 and the Abbe number is 35.26; depending on the general optical software used, the ± sign before the thickness parameter behind the reflector 10 also varies.

[0125] From Figure 2 , it can be seen that at the focal plane 11, the optical transfer function is close to the diffraction limit at most angles of the full field of view, and the optical transfer function can reach 0.4@150lp / mm. Only the unidirectional edge in the meridian direction decreases, all other aberrations have been well compensated, and a good imaging effect can be achieved.

[0126] From Figure 3 , it can be seen that the distortion of the optical lens is well controlled. Since the lens has a non-rotationally symmetric structure, the distortion in the meridian direction is controlled within 5%, and the distortion in the sagittal direction can be controlled within 0.5%.

[0127] The entire optical lens uses 11 optical elements. Except for the reflector 10, the remaining lenses are spherical or cylindrical lenses to achieve the entire optical lens design. It can achieve high-quality point target imaging in the spectral range of 450nm to 650nm and is suitable for visible light detectors smaller than 1 / 5.16 inches. Except for the cylindrical window of the first lens 1 which reaches 40.6mm, the diameter of the remaining lenses is less than 10mm. The overall length is more than 100mm, the focal length is 4.45mm, the F number is 4, the distortion of the entire field of view is controlled within 5%, the field of view angle is ≥45°, and the estimated weight is no more than 110g.

[0128] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. An optical lens for high-speed vehicle observation, characterized in that: it comprises a first lens (1), a reflecting mirror arranged on an outgoing light path of the first lens (1), and a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8) and a ninth lens (9) sequentially arranged on a reflected light path of the reflecting mirror (10); the first lens (1) is a positive meniscus cylindrical lens, with a convex surface thereof facing away from the reflecting mirror (10); the second lens (2) is a positive meniscus lens, with a convex surface thereof facing the reflecting mirror (10); the third lens (3) is a biconcave lens; the fourth lens (4) is a negative meniscus lens, with a convex surface thereof facing the fifth lens (5); the fifth lens (5) is a negative meniscus cylindrical lens, with a convex surface thereof facing the sixth lens (6); the sixth lens (6) is a positive meniscus lens, with a convex surface thereof facing the fifth lens (5); the seventh lens (7) is a biconvex lens; the eighth lens (8) is a biconvex lens; the ninth lens (9) is a negative meniscus lens, with a convex surface thereof facing away from the eighth lens (8); an optical path distance D1 between an exit surface of the first lens (1) and an incident surface of the reflecting mirror (10) on an optical axis satisfies 3mm ≤ D1 ≤ 5mm; an optical path distance D2 between an exit surface of the reflecting mirror (10) and an incident surface of the second lens (2) on an optical axis satisfies 0.1mm ≤ D2 ≤ 1mm; an optical path distance D3 between an exit surface of the second lens (2) and an incident surface of the third lens (3) on an optical axis satisfies 1mm ≤ D3 ≤ 2mm; an optical path distance D4 between an exit surface of the third lens (3) and an incident surface of the fourth lens (4) on an optical axis satisfies 5mm ≤ D4 ≤ 6mm; an optical path distance D5 between an exit surface of the fourth lens (4) and an incident surface of the fifth lens (5) on an optical axis satisfies 3mm ≤ D5 ≤ 4mm; an optical path distance D6 between an exit surface of the fifth lens (5) and an incident surface of the sixth lens (6) on an optical axis satisfies 60mm ≤ D6 ≤ 61mm; an optical path distance D7 between an exit surface of the sixth lens (6) and an incident surface of the seventh lens (7) on an optical axis satisfies 0.1mm ≤ D7 ≤ 1mm; an optical path distance D8 between an exit surface of the seventh lens (7) and an incident surface of the eighth lens (8) on an optical axis satisfies 24mm ≤ D8 ≤ 25mm; an optical path distance D9 between an exit surface of the eighth lens (8) and an incident surface of the ninth lens (9) on an optical axis satisfies 0.1mm ≤ D9 ≤ 1mm.

2. The optical lens for high-speed vehicle observation according to claim 1, characterized in that: a meridional curvature radius R11 of an incident surface of the first lens (1) is 28mm, and a meridional curvature radius R12 of an exit surface of the first lens (1) is 21.715mm; a sagittal curvature radius R21 of an incident surface of the second lens (2) satisfies -280mm < R21 < -270mm, and a sagittal curvature radius R22 of an exit surface of the second lens (2) satisfies -9mm < R22 < -8mm; The sagittal curvature radius R31 of the incident surface of the third lens (3) satisfies 40mm < R31 < 50mm, and the sagittal curvature radius R32 of the exit surface satisfies -230mm < R32 < -220mm; The sagittal curvature radius R41 of the incident surface of the fourth lens (4) satisfies 10mm < R41 < 12mm, and the sagittal curvature radius R42 of the exit surface satisfies 10mm < R42 < 11mm; The meridional curvature radius R51 of the incident surface of the fifth lens (5) is 12mm, and the meridional curvature radius R52 of the exit surface is 16mm; The sagittal curvature radius R61 of the incident surface of the sixth lens (6) satisfies -15mm < R61 < -13mm, and the sagittal curvature radius R62 of the exit surface satisfies -13mm < R62 < -10mm; The sagittal curvature radius R71 of the incident surface of the seventh lens (7) satisfies -15mm < R71 < -13mm, and the sagittal curvature radius R72 of the exit surface satisfies 200mm < R62 < 210mm; The sagittal curvature radius R81 of the incident surface of the eighth lens (8) satisfies -15mm < R81 < -13mm, and the sagittal curvature radius R82 of the exit surface satisfies 13mm < R62 < 15mm; The sagittal curvature radius R91 of the incident surface of the ninth lens (9) satisfies 10mm < R91 < 13mm, and the sagittal curvature radius R92 of the exit surface satisfies 20mm < R62 < 25mm.

3. The optical lens for high-speed vehicle observation according to claim 2, characterized in that: further comprising a diaphragm (12); the diaphragm (12) is arranged on the optical path between the fifth lens (5) and the sixth lens (6), and is arranged close to the incident surface of the sixth lens (6).

4. The optical lens for high-speed vehicle observation according to claim 3, characterized in that: the reflecting mirror (10) is a 45° beam-folding prism.

5. The optical lens for high-speed vehicle observation according to claim 4, characterized in that: the center thickness H1 of the first lens (1) is 20mm; the center thickness H2 of the second lens (2) satisfies 1.5mm ≤ H2 ≤ 2mm; the center thickness H3 of the third lens (3) satisfies 3mm ≤ H3 ≤ 4mm; the center thickness H4 of the fourth lens (4) satisfies 3mm ≤ H4 ≤ 4mm; the center thickness H5 of the fifth lens (5) is 5mm; the center thickness H6 of the sixth lens (6) satisfies 3.5mm ≤ H6 ≤ 4mm; the center thickness H7 of the seventh lens (7) satisfies 3mm ≤ H7 ≤ 4mm; the center thickness H8 of the eighth lens (8) satisfies 2mm ≤ H8 ≤ 3mm; the center thickness H9 of the ninth lens (9) satisfies 3mm ≤ H9 ≤ 4mm.

6. The optical lens for high-speed vehicle observation according to claim 5, characterized in that: the refractive index n1 of the first lens (1) is 1.458; the refractive index n2 of the second lens (2) satisfies 1.89 < n2 < 1.92; The refractive index n3 of the third lens (3) satisfies 1.

89. <n3<1.92; The refractive index n4 of the fourth lens (4) satisfies 1.

8. <n4<1.85; The refractive index n5 of the fifth lens (5) is 1.458; The refractive index n6 of the sixth lens (6) satisfies 1.90 < n6 < 1.95; The refractive index n7 of the seventh lens (7) satisfies 1.

45. <n7<1.55; The refractive index n8 of the eighth lens (8) satisfies 1.

45. <n8<1.55; The refractive index n9 of the ninth lens (9) satisfies 1.

90. <n9<1.95; The refractive index n10 of the mirror (10) satisfies 1.50 < n10 < 1.

53.

7. The optical lens for high-speed aircraft observation according to claim 6, characterized in that: The dispersion coefficient v1 of the first lens (1) is 67.8; The dispersion coefficient v2 of the second lens (2) satisfies 30 <v2<40; The dispersion coefficient v3 of the third lens (3) satisfies 30 <v3<40; The dispersion coefficient v4 of the fourth lens (4) satisfies 25 <v4<30; The dispersion coefficient v5 of the fifth lens (5) is 67.8; The dispersion coefficient v6 of the sixth lens (6) satisfies 15 <v6<20; The dispersion coefficient v7 of the seventh lens (7) satisfies 75 <v7<85; The dispersion coefficient v8 of the eighth lens (8) satisfies 75. <v8<85; The dispersion coefficient v9 of the ninth lens (9) satisfies 20 <v9<25; The dispersion coefficient v10 of the reflector (10) satisfies 60 <v10<65。 8. The optical lens for high-speed aircraft observation according to claim 7, characterized in that: The optical path distance D1 between the exit surface of the first lens (1) and the incident surface of the reflector (10) on the optical axis is 4 mm; The optical path distance D2 between the exit surface of the reflector (10) and the incident surface of the second lens (2) on the optical axis is 0.2 mm; The optical path distance D3 between the exit surface of the second lens (2) and the incident surface of the third lens (3) on the optical axis is 1.676 mm; The optical path distance D4 between the exit surface of the third lens (3) and the incident surface of the fourth lens (4) on the optical axis is 5.205 mm; The optical path distance D5 between the exit surface of the fourth lens (4) and the incident surface of the fifth lens (5) on the optical axis is 3.262 mm; The optical path distance D6 between the exit surface of the fifth lens (5) and the incident surface of the sixth lens (6) on the optical axis is 60.2 mm; The optical path distance D7 between the exit surface of the sixth lens (6) and the incident surface of the seventh lens (7) on the optical axis is 0.919 mm; The optical path distance D8 between the exit surface of the seventh lens (7) and the incident surface of the eighth lens (8) on the optical axis is 24.76 mm; The optical path distance D9 between the exit surface of the eighth lens (8) and the incident surface of the ninth lens (9) on the optical axis is 0.805 mm; The incident surface radius of curvature R21 of the second lens (2) is -279.5426mm, and the exit surface radius of curvature R22 is -8.71365mm; The incident surface of the third lens (3) has a sagittal curvature radius R31 of 47.6077 mm, and the exit surface has a sagittal curvature radius R32 of -228.8238 mm. The incident surface radius of curvature R41 of the fourth lens (4) is 11.23139 mm, and the exit surface radius of curvature R42 is 10.4560 mm. The incident surface radius of curvature R61 of the sixth lens (6) is -13.7438 mm, and the exit surface radius of curvature R62 is -10.8017 mm. The incident surface radius of curvature R71 of the seventh lens (7) is -14.4226 mm, and the exit surface radius of curvature R72 is 207.5593 mm. The incident surface radius of curvature R81 of the eighth lens (8) is -12.8971 mm, and the exit surface radius of curvature R82 is 13.5431 mm. The incident surface of the ninth lens (9) has a sagittal curvature radius R91 of 12.0324 mm and an exit surface has a sagittal curvature radius R92 of 23.8580 mm.

9. The optical lens for high-speed aircraft observation according to claim 8, characterized in that: The center thickness H2 of the second lens (2) is 1.5 mm; The center thickness H3 of the third lens (3) is 3.5 mm; The center thickness H4 of the fourth lens (4) is 3.5 mm; The center thickness H6 of the sixth lens (6) is 3.5 mm; The center thickness H7 of the seventh lens (7) is 3.5 mm; The center thickness H8 of the eighth lens (8) is 2.174 mm; The center thickness H9 of the ninth lens (9) is 3.5 mm.

10. The optical lens for high-speed aircraft observation according to claim 9, characterized in that: The refractive index n2 of the second lens (2) is 1.910826; The refractive index n3 of the third lens (3) is 1.910826; The refractive index n4 of the fourth lens (4) is 1.846817; The refractive index n6 of the sixth lens (6) is 1.925611; The refractive index n7 of the seventh lens (7) is 1.496851; The refractive index n8 of the eighth lens (8) is 1.496998; The refractive index n9 of the ninth lens (9) is 1.929815; The refractive index n10 of the mirror (10) is 1.516800; The dispersion coefficient v2 of the second lens (2) is 35.26; The dispersion coefficient v3 of the third lens (3) is 35.26; The dispersion coefficient v4 of the fourth lens (4) is 29.47; The dispersion coefficient v6 of the sixth lens (6) is 18.26; The dispersion coefficient v7 of the seventh lens (7) is 81.4; The dispersion coefficient v8 of the eighth lens (8) is 81.59; The dispersion coefficient v9 of the ninth lens (9) is 23.04; The dispersion coefficient v10 of the reflector (10) is 64.2.

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