A seeker optical system applicable to multiple optical bands

Abstract

The present invention discloses a seeker optical system applicable to multiple optical bands, comprising a light-collecting lens, a first lens, a band-adjusting lens, a second lens, a third lens, a fourth lens, a fifth lens and a reflecting lens arranged along an optical axis from object measurement to image measurement. The optical system can realize light transmission in visible light and infrared medium and long wave bands, and has a simple and reasonable structure, which not only effectively reduces the difficulty of processing and adjustment and reduces the weight of the system, but also makes the cost of the entire system low and the structure more compact. The third lens and the reflecting lens are aspherical mirrors, which greatly improve the imaging quality of the optical system, and have the advantages of perfect performance, strong energy of focusing target radiation, and long working distance.

Description

Technical Field

[0001] The invention relates to a seeker optical system, in particular to a seeker optical system applicable to multiple optical bands. Background Art

[0002] In the fields of science and technology and the military, the seeker is the eye of the entire missile. It can complete autonomous search, identification and tracking of the target and give the signals required for guidance. The optical system is located at the front end of the position marker and is used to receive the infrared radiation of the target. It has an impact on the effective range and tracking and searching capabilities of the seeker. Therefore, the imaging quality of the optical system plays a vital role in the entire seeker. However, the target signal is currently received only within the infrared radiation range. The infrared band involved is narrow and it lacks the ability to receive the visible light band. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a seeker optical system applicable to multiple optical bands.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] A seeker optical system applicable to multiple optical bands, comprising a light collecting lens, a first lens, a band adjusting lens, a second lens, a third lens, a fourth lens, a fifth lens and a reflecting lens arranged along an optical axis from object measurement to image measurement;

[0006] The object side of the light-collecting lens is convex, and the image side is concave;

[0007] The object side of the first lens is convex, and the image side is concave;

[0008] The object side of the second lens is concave, and the image side is convex;

[0009] The object side of the third lens is convex, and the image side is concave;

[0010] The object side of the fourth lens is concave, and the image side is convex;

[0011] The object side of the fifth lens is concave, and the image side is convex;

[0012] The object surface side of the reflective lens is a concave surface, and the image surface side is a convex surface.

[0013] The focal lengths of the light-collecting lens, the first lens, the second lens, the third lens, the fourth lens and the fifth lens are positive, and the focal length of the reflecting lens is negative.

[0014] The light-collecting lens is a spherical reflector made of CSBR glass material, and a reflective film is coated on the surface; the first lens is a spherical reflector made of MIRROR glass material, and a reflective film is coated on the surface; the second lens is a spherical lens made of MIRROR glass material; the third lens is an aspherical lens; the fourth lens is a spherical lens made of MIRROR glass material; the fifth lens is a spherical lens; the reflecting lens is an aspherical reflector made of MIRROR glass material, and a reflective film is coated on the surface.

[0015] The circular shading mirror of the reflecting lens has a minimum radius of 40 mm and a maximum radius of 116.6 mm; the surface of the reflecting lens is an even-order aspheric surface; and the curvature radius of the light-collecting lens is 170 mm.

[0016] The reflective film is a diamond film.

[0017] The total focal length of the optical system is f=270 mm, and the total optical length of the system is 185.8 mm.

[0018] The band adjustment lens includes a front adjustment lens and a rear adjustment lens; the object side of the front adjustment lens is convex, and the image side is concave; the object side of the rear adjustment lens is concave, and the image side is convex; the focal lengths of the front adjustment lens and the rear adjustment lens are both positive.

[0019] The front adjustment lens is a spherical lens made of MIRROR glass material, and the rear adjustment lens is an aspherical reflector.

[0020] The object side and the image side of the band-adjusting lens are both concave surfaces; and the focal length of the band-adjusting lens is positive.

[0021] The band-adjusting lens is a spherical lens made of GERMANIUM glass material.

[0022] The beneficial effects of the present invention are as follows: the present invention can realize light conduction in the visible light and infrared medium and long wave bands, and has a simple and reasonable structure, which not only effectively reduces the difficulty of processing and adjustment and reduces the weight of the system, but also makes the cost of the entire system low and the structure more compact. The third lens and the reflecting lens are aspherical lenses, which greatly improve the imaging quality of the optical system, and have the advantages of perfect performance, strong energy of focusing target radiation, and long working distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0025] Figure 2is an infrared medium wave axial difference diagram of the first embodiment of the present invention;

[0026] Figure 3 is a schematic diagram of the optical path difference of the first embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of field curvature and distortion according to the first embodiment of the present invention;

[0028] Figure 5 is a transfer function diagram of the first embodiment of the present invention;

[0029] Figure 6 is a point array schematic diagram of the first embodiment of the present invention;

[0030] Figure 7 is a structural diagram of Embodiment 2 of the present invention;

[0031] Figure 8 is an infrared medium wave axial difference diagram of the second embodiment of the present invention;

[0032] Fig. 9 is a schematic diagram of the optical path difference of the second embodiment of the present invention;

[0033] Fig.10 is a schematic diagram of field curvature and distortion according to the second embodiment of the present invention;

[0034] Fig.11 is a transfer function diagram of the second embodiment of the present invention;

[0035] Fig.12 is a point array schematic diagram of the second embodiment of the present invention;

[0036] Fig.13 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0037] Fig.14 is an infrared medium wave axial difference diagram of embodiment 3 of the present invention;

[0038] Fig.15 is a schematic diagram of the optical path difference of the third embodiment of the present invention;

[0039] Fig.16 is a schematic diagram of field curvature and distortion according to the third embodiment of the present invention;

[0040] Fig.17 is a transfer function diagram of the third embodiment of the present invention;

[0041] Fig.18 It is a point array schematic diagram of the third embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0044] Implementation method 1:

[0045] Reference Figure 1 , a seeker optical system applicable to multiple optical bands, comprising a light collecting lens 1, a first lens 2, a band adjusting lens 3, a second lens 4, a third lens 5, a fourth lens 6, a fifth lens 7 and a reflecting lens 8 arranged along an optical axis from object measurement to image measurement;

[0046] The object side of the light collecting lens 1 is convex, and the image side is concave;

[0047] The object side of the first lens 2 is convex, and the image side is concave;

[0048] The object side of the second lens 4 is concave, and the image side is convex;

[0049] The object side of the third lens 5 is convex, and the image side is concave;

[0050] The object side of the fourth lens 6 is concave, and the image side is convex;

[0051] The object side of the fifth lens 7 is concave, and the image side is convex;

[0052] The object surface side of the reflecting lens 8 is a concave surface, and the image surface side is a convex surface.

[0053] The light-collecting lens 1 and the reflecting lens 8 are respectively the primary and secondary lenses, and the first lens 2, the band-adjusting lens 3, the second lens 4, the third lens 5, the fourth lens 6 and the fifth lens 7 constitute a compensation lens group. The optical system of this embodiment can achieve 3.7um to 4.8um infrared light transmission, and the system structure itself is concise and reasonable, which not only effectively reduces the difficulty of processing and adjustment, low cost and reduces the weight of the system, but also makes the structure of the entire system more compact.

[0054] The focal lengths of the light collecting lens 1 , the first lens 2 , the second lens 4 , the third lens 5 , the fourth lens 6 and the fifth lens 7 are positive, and the focal length of the reflecting lens 8 is negative.

[0055] The light-collecting lens 1 is a spherical reflector made of CSBR glass material, and a reflective film is coated on the surface; the first lens 2 is a spherical reflector made of MIRROR glass material, and a reflective film is coated on the surface; the second lens 4 is a spherical lens made of MIRROR glass material; the third lens 5 is an aspherical lens; the fourth lens 6 is a spherical lens made of MIRROR glass material; the fifth lens 7 is a spherical lens; the reflecting lens 8 is an aspherical reflector made of MIRROR glass material, and a reflective film is coated on the surface, so that the optical structure can enhance the energy of target radiation and achieve a longer effective distance.

[0056] The circular shading mirror of the reflecting lens 8 has a minimum radius of 40 mm and a maximum radius of 116.6 mm;

[0057] The surface of the reflecting lens 8 is an even-order aspherical surface; the curvature radius of the light-collecting lens 1 is 170 mm, and the use of the above-mentioned aspherical lens greatly improves the imaging quality of the optical system.

[0058] The reflective film is one or more layers of diamond film, which can enhance the mechanical strength of the optical system when actually applied to the seeker fairing, so that the fairing using the optical system can withstand aerodynamic forces of 2450 to 3675 km / h, reduce friction and fundamental wave coefficient, and improve resistance to thermal shock.

[0059] The total focal length of the optical system is f=270 mm, and the total optical length of the system is 185.8 mm. Therefore, the structure of the optical system is extremely delicate and compact.

[0060] The band adjustment lens 3 includes a front adjustment lens 9 and a rear adjustment lens 10; the object side of the front adjustment lens 9 is convex, and the image side is concave; the object side of the rear adjustment lens 10 is concave, and the image side is convex; the focal lengths of the front adjustment lens 9 and the rear adjustment lens 10 are both positive.

[0061] The front adjustment lens 9 is a spherical lens made of MIRROR glass material, and the rear adjustment lens 10 is an aspherical reflector.

[0062] In summary, the optical system designed in this embodiment can make the overall high-performance seeker optical system performance more perfect; Figure 1 To Attachment Figure 6 And Table 1 illustrates this embodiment.

[0063]

[0064]

[0065] Table 1

[0066] Where: S1: object side of the light-collecting lens; S2: image side of the light-collecting lens;

[0067] S3: the image plane of the reflection lens; S4: the image plane of the first lens;

[0068] S5: front adjustment of the image plane of the lens; S6: rear adjustment of the image plane of the lens;

[0069] S7: the image plane of the second lens; S8: the image plane of the third lens;

[0070] S9: the image plane of the fourth lens; S10: the image plane of the fifth lens;

[0071] The focal length, radius of curvature and axial thickness are expressed in mm.

[0072] Table 1 shows the design data of each lens in this embodiment, wherein S1 and S2 represent the object side and image side of the light-collecting lens respectively; S3 is the object-image surface of the reflecting lens; if the connecting line direction is the same as the light propagation direction, it is positive, otherwise it is negative; if the surface is a plane, the radius of curvature of the surface is infinite; the "thickness" in Table 1 gives the distance between two adjacent surfaces on the optical axis, and the positive and negative judgment principle is: take the current surface vertex as the starting point and the next surface vertex as the end point; if the connecting line direction is the same as the light propagation direction, it is positive, otherwise it is negative; if the material between the two surfaces is infrared material, then the thickness represents the lens thickness, and if there is no material between the two surfaces, then it represents the air gap between the two lenses.

[0073] Figure 2 , 3 The diagrams shown are respectively the axial difference and the optical path difference of light in the infrared mid-wave (3.7um-4.8um) band passing through the optical system implementation method 1; Figure 2 The deviation values ​​of the three infrared rays (4.8 um wavelength, 4.2 um wavelength and 3.7 um wavelength) gradually decrease as they get closer to the coordinate axes on both sides and intersect with the coordinate axes. It can be seen that even if there are vertical axis chromatic aberration and axial aberration after optimization, they have been compensated (the left part is the axial aberration, and the right part is the vertical axis chromatic aberration). In Figure 3, the curve of the meridian vertical axis aberration is more curved, so its meridian coma is larger, but it is still within the acceptable range of the design (the left part is the optical path difference, and the right part is the transverse light fan diagram).

[0074] Figure 4The figure shows the field curvature and distortion diagram of infrared medium wave light passing through the first implementation mode of the optical system. It can be seen that the three lines are almost coincident, but the distance from the vertical axis is large; and in the distortion diagram, the closer the line is to the upper end, the more it deviates from the vertical axis. It can be concluded that the sagittal field curvature and the meridian of the red line exist, but are within an acceptable range.

[0075] Figure 5 and 6 The figure shows the transfer function and point array diagram of infrared medium wave band light passing through the optical system implementation method 1; Figure 5 When the cutoff frequency is 10lp / mm, the minimum value of the MTF curve exceeds 0.6, which meets the imaging requirements; refer to Figure 6 In the entire 1.2° viewing angle, the point array images are all within the airy spot, among which the 3.7um and 4.8um infrared bands are more concentrated, and the imaging quality is optimized to the greatest extent.

[0076] Implementation method 2:

[0077] Reference Figure 7 , a seeker optical system applicable to multiple optical bands, comprising a light collecting lens 1, a first lens 2, a band adjusting lens 3, a second lens 4, a third lens 5, a fourth lens 6, a fifth lens 7 and a reflecting lens 8 arranged along an optical axis from object measurement to image measurement;

[0078] The object side of the light collecting lens 1 is convex, and the image side is concave;

[0079] The object side of the first lens 2 is convex, and the image side is concave;

[0080] The object side of the second lens 4 is concave, and the image side is convex;

[0081] The object side of the third lens 5 is convex, and the image side is concave;

[0082] The object side of the fourth lens 6 is concave, and the image side is convex;

[0083] The object side of the fifth lens 7 is concave, and the image side is convex;

[0084] The object surface side of the reflecting lens 8 is a concave surface, and the image surface side is a convex surface.

[0085] The light-collecting lens 1 and the reflecting lens 8 are respectively the primary and secondary lenses, and the first lens 2, the band-adjusting lens 3, the second lens 4, the third lens 5, the fourth lens 6 and the fifth lens 7 constitute a compensation lens group. The optical system of this embodiment can achieve 8um to 12um infrared light transmission, and the system structure itself is concise and reasonable, which not only effectively reduces the difficulty of processing and adjustment, low cost and reduces the weight of the system, but also makes the structure of the entire system more compact.

[0086] The focal lengths of the light collecting lens 1 , the first lens 2 , the second lens 4 , the third lens 5 , the fourth lens 6 and the fifth lens 7 are positive, and the focal length of the reflecting lens 8 is negative.

[0087] The light-collecting lens 1 is a spherical reflector made of CSBR glass material, and a reflective film is coated on the surface; the first lens 2 is a spherical reflector made of MIRROR glass material, and a reflective film is coated on the surface; the second lens 4 is a spherical lens made of MIRROR glass material; the third lens 5 is an aspherical lens; the fourth lens 6 is a spherical lens made of MIRROR glass material; the fifth lens 7 is a spherical lens; the reflecting lens 8 is an aspherical reflector made of MIRROR glass material, and a reflective film is coated on the surface, so that the optical structure gathers the energy of the target radiation to enhance the effective distance.

[0088] The circular shading mirror of the reflecting lens 8 has a minimum radius of 40 mm and a maximum radius of 116.6 mm;

[0089] The surface of the reflecting lens 8 is an even-order aspherical surface; the curvature radius of the light-collecting lens 1 is 170 mm, and the use of the above-mentioned aspherical lens greatly improves the imaging quality of the optical system.

[0090] The reflective film is one or more layers of diamond film, which can enhance the mechanical strength of the optical system when actually applied to the seeker fairing, so that the fairing using the optical system can withstand aerodynamic forces of 2450 to 3675 km / h, reduce friction and fundamental wave coefficient, and improve resistance to thermal shock.

[0091] The total focal length of the optical system is f=270 mm, and the total optical length of the system is 185.8 mm.

[0092] The object side and the image side of the band adjustment lens 3 are both concave; the focal length of the band adjustment lens 3 is positive. The band adjustment lens 3 is a spherical lens made of GERMANIUM glass material. Compared with the first embodiment, this embodiment can reduce the number of correction lens groups, further reduce the weight of the system, and make assembly more convenient.

[0093] The following will use examples, Figure 7 To Attachment Fig.12 And Table 2 illustrate this embodiment.

[0094]

[0095]

[0096] Table 2

[0097] Where: S1: object side of the light-collecting lens; S2: image side of the light-collecting lens;

[0098] S3: the image plane of the reflection lens; S4: the image plane of the first lens;

[0099] S5: the object image surface of the band-adjusting lens; S6: the image side surface of the band-adjusting lens;

[0100] S7: the image plane of the second lens; S8: the image plane of the third lens;

[0101] S9: the image plane of the fourth lens; S10: the image plane of the fifth lens;

[0102] The focal length, radius of curvature and axial thickness are expressed in mm.

[0103] Table 2 shows the design data of each lens in this embodiment, where S1 and S2 represent the object side and image side of the light-collecting lens respectively; S3 represents the object image side of the reflecting lens; S5 and S6 represent the object side and image side of the band-adjusting lens respectively;

[0104] Figure 8 , 9 The figures are respectively a schematic diagram of the axial difference and the optical path difference of light in the infrared long-wave (8um to 12um) band passing through the optical system implementation method 2; Figure 2 The three infrared rays (8.0um wavelength, 10.2um wavelength and 12.0um wavelength) extend to both sides and slightly deviate from the coordinate axis, but the vertical axis aberration and axial chromatic aberration are not large. Fig. 9 The curvature of the perpendicular axis aberration curve is not large, indicating that the meridian coma aberration is not large.

[0105] Fig.10 The figure shows the field curvature and distortion of infrared long-wave light passing through the second embodiment of the optical system. It can be seen that the light becomes more separated as it extends upwards and gradually deviates toward the vertical axis, so both meridian and field curvature exist, but are within an acceptable range.

[0106] Fig.11 and Fig.12 The figure shows the transfer function and point array diagram of infrared long-wave light passing through the optical system implementation method 2; Fig.11 In the figure, when the cutoff frequency is 10lp / mm, the minimum value of the MTF curve is greater than 0.3, which meets the imaging requirements; refer to Fig.12 , in the entire 1.2° viewing angle, the point array image is within the airy spot, in which the three infrared bands are concentrated together, and the imaging quality meets the requirements.

[0107] It should be noted that Figures 7 to 12 The structural divisions of the components are respectively the same as those of the first embodiment. Figures 1 to 6 .

[0108] Implementation method three:

[0109] Reference Fig.13 , a seeker optical system applicable to multiple optical bands, comprising a light collecting lens 1, a first lens 2, a band adjusting lens 3, a second lens 4, a third lens 5, a fourth lens 6, a fifth lens 7 and a reflecting lens 8 arranged along an optical axis from object measurement to image measurement;

[0110] The object side of the light collecting lens 1 is convex, and the image side is concave;

[0111] The object side of the first lens 2 is convex, and the image side is concave;

[0112] The object side of the second lens 4 is concave, and the image side is convex;

[0113] The object side of the third lens 5 is convex, and the image side is concave;

[0114] The object side of the fourth lens 6 is concave, and the image side is convex;

[0115] The object side of the fifth lens 7 is concave, and the image side is convex;

[0116] The object surface side of the reflecting lens 8 is a concave surface, and the image surface side is a convex surface.

[0117] The light-collecting lens 1 and the reflecting lens 8 are respectively the primary and secondary lenses, and the first lens 2, the band-adjusting lens 3, the second lens 4, the third lens 5, the fourth lens 6 and the fifth lens 7 constitute a compensation lens group. The optical system of this embodiment can realize visible light transmission, and the system structure itself is concise and reasonable, which not only effectively reduces the difficulty of processing and adjustment, low cost and reduces the weight of the system, but also makes the structure of the entire system more compact.

[0118] The focal lengths of the light collecting lens 1 , the first lens 2 , the second lens 4 , the third lens 5 , the fourth lens 6 and the fifth lens 7 are positive, and the focal length of the reflecting lens 8 is negative.

[0119] The light-collecting lens 1 is a spherical reflector made of CSBR glass material, and a reflective film is coated on the surface; the first lens 2 is a spherical reflector made of MIRROR glass material, and a reflective film is coated on the surface; the second lens 4 is a spherical lens made of MIRROR glass material; the third lens 5 is an aspherical lens; the fourth lens 6 is a spherical lens made of MIRROR glass material; the fifth lens 7 is a spherical lens; the reflecting lens 8 is an aspherical reflector made of MIRROR glass material, and a reflective film is coated on the surface, so that the optical structure gathers the energy of the target radiation to enhance the effective distance.

[0120] The circular shading mirror of the reflecting lens 8 has a minimum radius of 40 mm and a maximum radius of 116.6 mm;

[0121] The surface of the reflecting lens 8 is an even-order aspherical surface; the curvature radius of the light-collecting lens 1 is 170 mm, and the use of the above-mentioned aspherical lens greatly improves the imaging quality of the optical system.

[0122] The reflective film is one or more layers of diamond film, which can enhance the mechanical strength of the optical system when actually applied to the seeker fairing, so that the fairing using the optical system can withstand aerodynamic forces of 2450 to 3675 km / h, reduce friction and fundamental wave coefficient, and improve resistance to thermal shock.

[0123] The total focal length of the optical system is f=270 mm, and the total optical length of the system is 185.8 mm.

[0124] The band adjustment lens 3 includes a front adjustment lens 9 and a rear adjustment lens 10; the object side of the front adjustment lens 9 is convex, and the image side is concave; the object side of the rear adjustment lens 10 is concave, and the image side is convex; the focal lengths of the front adjustment lens 9 and the rear adjustment lens 10 are both positive.

[0125] The front adjustment lens 9 is a spherical lens made of MIRROR glass material, and the rear adjustment lens 10 is an aspherical reflector.

[0126] The following will use examples, Fig.13 To Attachment Fig.18 And Table 3 illustrate this embodiment.

[0127]

[0128]

[0129] Table 3

[0130] Where: S1: object side of the light-collecting lens; S2: image side of the light-collecting lens;

[0131] S3: the image plane of the reflection lens; S4: the image plane of the first lens;

[0132] S5: front adjustment of the image plane of the lens; S6: rear adjustment of the image plane of the lens;

[0133] S7: the image plane of the second lens; S8: the image plane of the third lens;

[0134] S9: the image plane of the fourth lens; S10: the image plane of the fifth lens;

[0135] The focal length, radius of curvature and axial thickness are expressed in mm.

[0136] Table 3 shows the design data of each lens in this embodiment. The difference of the first embodiment is that the optical surface curvature radius of the image surface of the first lens is 159.101 mm, and the conic coefficient of the image surface of the rear adjustment lens is -9.623*10 14 , the cone coefficient of the third lens is -3.368*10 11 The thickness of the lens on the object surface of the fifth lens is 5.099 mm.

[0137] Fig.14 and Fig.15 The diagrams shown are respectively the axial difference and the optical path difference of light in the visible light band passing through the third embodiment of the optical system; Fig.14 The four visible rays (0.47um wavelength, 0.51um wavelength, 0.555um wavelength and 0.61um wavelength) in the middle deviate from the coordinate axes on both sides as they extend to both sides, and the rays gradually separate (the left part is axial aberration, and the right part is vertical chromatic aberration); Fig.15 In the figure, the curvature of the meridian vertical axis difference curve is not large, and it is basically extended linearly. The above two figures show that there is position chromatic aberration, but it is still within the acceptable range of the design (the left part is the optical path difference, and the right part is the transverse light fan diagram).

[0138] Fig.16 The figure shows the field curvature and distortion of light in the visible light band passing through the third implementation mode of the optical system. The lines of each wavelength overlap, indicating that no field curvature is generated, but there is position chromatic aberration, which is within an acceptable range.

[0139] Fig.17 and 18 The figure shows the transfer function and point array diagram of light in the visible light band passing through the optical system implementation method 3; Fig.17 When the cutoff frequency is 10lp / mm, the minimum value of the MTF curve exceeds 0.9, which meets the imaging requirements; refer to Figure 6 , 80% of the wavelengths of 0.47 and 0.51um are in the airy spot, while the wavelengths after 0.555um are more dispersed, indicating that although there is position chromatic aberration, the overall imaging meets the design requirements.

[0140] The above implementation modes cannot limit the protection scope of the present invention. The equivalent modifications and changes made by those skilled in the art without departing from the overall concept of the present invention are still within the scope of the present invention.

Claims

1. A seeker optical system applicable to multiple optical bands, characterized in that It comprises a light-collecting lens (1), a first lens (2), a wavelength-band adjusting lens (3), a second lens (4), a third lens (5), a fourth lens (6), a fifth lens (7) and a reflecting lens (8) arranged along an optical axis from object measurement to image measurement; The object surface side of the light-collecting lens (1) is a convex surface, and the image surface side is a concave surface; The object surface side of the first lens (2) is convex, and the image surface side is concave; The object surface side of the second lens (4) is concave, and the image surface side is convex; The object surface side of the third lens (5) is convex, and the image surface side is concave; The object side of the fourth lens (6) is a concave surface, and the image side is a convex surface; The object surface side of the fifth lens (7) is a concave surface, and the image surface side is a convex surface; The object surface side of the reflective lens (8) is a concave surface, and the image surface side is a convex surface; The focal lengths of the light-collecting lens (1), the first lens (2), the second lens (4), the third lens (5), the fourth lens (6) and the fifth lens (7) are positive, and the focal length of the reflecting lens (8) is negative; The light-collecting lens (1) is a spherical reflector made of CSBR glass material, and a reflective film is coated on the surface; the first lens (2) is a spherical reflector made of MIRROR glass material, and a reflective film is coated on the surface; the second lens (4) is a spherical lens made of MIRROR glass material; the third lens (5) is an aspherical lens; the fourth lens (6) is a spherical lens made of MIRROR glass material; the fifth lens (7) is a spherical lens; the reflecting lens (8) is an aspherical reflector made of MIRROR glass material, and a reflective film is coated on the surface; The circular shading mirror of the reflecting lens (8) has a minimum radius of 40 mm and a maximum radius of 116.6 mm; the surface of the reflecting lens (8) is an even-order aspheric surface; the curvature radius of the light-collecting lens (1) is 170 mm; The total focal length of the optical system is f=270 mm, and the total optical length of the system is 185.8 mm; The wavelength band adjustment lens (3) comprises a front adjustment lens (9) and a rear adjustment lens (10); the object surface side of the front adjustment lens (9) is a convex surface, and the image surface side is a concave surface; the object surface side of the rear adjustment lens (10) is a concave surface, and the image surface side is a convex surface; the focal lengths of the front adjustment lens (9) and the rear adjustment lens (10) are both positive; The front adjustment lens (9) is a spherical lens made of MIRROR glass material, and the rear adjustment lens (10) is an aspherical reflector; The object surface side and the image surface side of the band adjustment lens (3) are both concave surfaces; the focal length of the band adjustment lens (3) is positive; The band adjustment lens (3) is a spherical lens made of GERMANIUM glass material.

2. The seeker optical system applicable to multiple optical bands according to claim 1, characterized in that The reflective film is a diamond film.

Images