Multiband optical system

Abstract

The utility model discloses a multiband optical system, which relates to the technical field of optics, and comprises a front lens group, a second dichroic mirror, a medium wave lens group, a visible light lens group and a long wave lens group, the front lens group comprises a first dichroic mirror, the first dichroic mirror is used for decomposing light rays into mixed light rays of medium wave infrared light rays and visible light and long wave infrared light rays, and the second dichroic mirror is used for decomposing the mixed light rays of visible light and long wave infrared light rays; the second dichroic mirror is located on an emergent path of the mixed light of the visible light and the long-wave infrared light and is used for decomposing the mixed light of the visible light and the long-wave infrared light into visible light and long-wave infrared light, and the medium-wave mirror group is used for correcting medium-wave infrared light and converging the medium-wave infrared light on a focal plane of the medium-wave detector; the visible light lens group is used for correcting visible light and converging the visible light on a focal plane of the visible light detector, and the long-wave lens group is used for correcting long-wave infrared light and converging the long-wave infrared light on a focal plane of the long-wave detector. Through the arrangement, the multi-band optical system can rapidly and accurately detect target characteristic information of three bands of visible light, medium wave and long wave infrared in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of optics, in particular to a multi-band optical system. Background Art

[0002] Airborne optoelectronic payloads can accomplish important functions such as "wide-area search, long-range detection, accurate positioning, rapid destruction, and real-time evaluation", and have become important equipment for tasks such as battlefield environment information acquisition, regional situation awareness, and laser precision guidance. With the continuous development of high-altitude, high-speed, and stealth flight platforms, the application model has also shifted toward panoramic perception, intelligent decision-making, and collaborative operations, and the demand for low-cost, miniaturized, lightweight, and high-function density optoelectronic payloads has become more clear.

[0003] The structures of multi-band common aperture optical systems generally include: common optical path and common focal plane structure, and common optical path post-convergent / divergent beam splitting structure.

[0004] However, the existing common optical path post-convergent / divergent beam splitting structure has difficult optical design and complex assembly and detection, and cannot achieve fast, accurate and real-time detection of target information characteristics of light in multiple bands. Utility Model Content

[0005] The main purpose of the utility model is to propose a multi-band optical system, aiming to solve the problems of difficult optical design and complex assembly and detection in the existing common optical path rear convergent / divergent beam splitting structure, and the inability to quickly, accurately and real-time detect target information characteristics of light in multiple bands.

[0006] In order to achieve the above-mentioned object, the utility model proposes a multi-band optical system, comprising:

[0007] A front mirror group, comprising a first dichroic mirror, wherein the first dichroic mirror is used to decompose the light incident in the transverse direction into medium-wave infrared light and mixed light of visible light and long-wave infrared light emitted in the transverse direction and in opposite directions;

[0008] A second dichroic mirror is disposed on one side of the front mirror group in the horizontal direction and is located on the emission path of the mixed light of visible light and long-wave infrared light, and the second dichroic mirror is used to decompose the mixed light of visible light and long-wave infrared light into visible light emitted in the longitudinal direction and long-wave infrared light emitted in the transverse direction;

[0009] A medium wave mirror group is arranged on the emission path of the medium wave infrared light, and is used to correct the medium wave infrared light and focus it on the focal plane of the medium wave detector;

[0010] A visible light lens set is arranged on the emission path of the visible light, and is used to correct the visible light and focus it on the focal plane of the visible light detector; and

[0011] The long-wave mirror group is arranged on the emission path of the long-wave infrared light, and is used for correcting the long-wave infrared light and converging it on the focal plane of the long-wave detector.

[0012] In one embodiment, the medium wave mirror group is located on a side of the front mirror group away from the second dichroic mirror and extends longitudinally. The medium wave mirror group is used to correct the medium wave infrared light emitted from the first dichroic mirror to be emitted laterally from one side of the first dichroic mirror along the longitudinal direction.

[0013] The visible light mirror group is arranged on one side of the second dichroic mirror in the longitudinal direction, and the visible light mirror group is used to correct the visible light emitted from the second dichroic mirror to be emitted in the horizontal direction on one side of the second dichroic mirror in the longitudinal direction, and the emission direction is opposite to the medium-wave infrared light;

[0014] The long-wave mirror group is arranged on a side of the second dichroic mirror away from the first dichroic mirror and is extended in the longitudinal direction. The long-wave mirror group is used to correct the long-wave infrared light emitted from the second dichroic mirror so that the second dichroic mirror emits it in the lateral direction on the other side in the longitudinal direction, and the emission direction is opposite to the medium-wave infrared light.

[0015] In one embodiment, the medium wave mirror assembly includes:

[0016] A medium-wave first reflector is arranged at a distance from the first dichroic mirror on a side away from the second dichroic mirror, and the medium-wave first reflector is used to change the medium-wave infrared light emitted from the first dichroic mirror to be emitted in the longitudinal direction;

[0017] A medium-wave second reflector is arranged at intervals on the upper side of the medium-wave first reflector and is arranged to intersect with the medium-wave first reflector, and the medium-wave second reflector is used to change the medium-wave infrared light emitted from the medium-wave first reflector to be emitted in a lateral direction;

[0018] A medium-wave galvanometer is arranged at intervals on one side of the medium-wave second reflector in the horizontal direction and is arranged in parallel with the medium-wave second reflector, and the medium-wave galvanometer is used to change the medium-wave infrared light emitted from the medium-wave second reflector to be emitted in the vertical direction; and

[0019] The medium-wave third reflector is arranged at a distance from the medium-wave galvanometer on a side away from the front mirror group and is arranged to intersect with the medium-wave galvanometer. The medium-wave third reflector is used to change the medium-wave infrared light emitted from the medium-wave galvanometer to be emitted horizontally.

[0020] In one embodiment, the medium wave galvanometer is rotatably arranged along an axis extending in the vertical direction.

[0021] In one embodiment, the visible light mirror assembly comprises:

[0022] a first visible light reflector, arranged at intervals on one side of the second dichroic mirror in the longitudinal direction and arranged in parallel with the second dichroic mirror, and used for changing the visible light emitted from the second dichroic mirror to be emitted in the lateral direction;

[0023] A visible light galvanometer is arranged at intervals on one side of the first visible light reflector in the transverse direction and is arranged to intersect with the first visible light reflector, and the visible light galvanometer is used to change the visible light emitted from the first visible light reflector to be emitted in the longitudinal direction; and

[0024] The second visible light reflector is arranged at a distance from the visible light galvanometer on one side in the longitudinal direction and is arranged in parallel with the visible light galvanometer. The second visible light reflector is used to change the visible light emitted from the visible light galvanometer to be emitted in the lateral direction.

[0025] In one embodiment, the visible light galvanometer is rotatably disposed along an axis extending in the vertical direction.

[0026] In one embodiment, the long-wavelength mirror assembly comprises:

[0027] a long-wave first reflector, arranged at a distance from the second dichroic mirror on a side away from the first dichroic mirror and arranged to intersect with the second dichroic mirror, and used for changing the long-wave infrared light emitted from the second dichroic mirror to be emitted in the longitudinal direction;

[0028] A long-wave galvanometer is arranged on one side of the long-wave first reflector along the longitudinal direction and is arranged to intersect with the long-wave first reflector, and the long-wave galvanometer is used to change the long-wave infrared light emitted from the long-wave first reflector to be emitted in the lateral direction;

[0029] A long-wave second reflector is arranged on one side of the long-wave galvanometer along the horizontal direction and is arranged in parallel with the long-wave galvanometer, and the long-wave second reflector is used to change the long-wave infrared light emitted from the long-wave galvanometer to be emitted along the vertical direction; and,

[0030] The long-wave third reflector is arranged on one side of the long-wave second reflector along the longitudinal direction and is rubber-set with the long-wave second reflector. The long-wave third reflector is used to change the long-wave infrared light emitted from the long-wave second reflector to be emitted in the lateral direction.

[0031] In one embodiment, the long-wave galvanometer is rotatably arranged along an axis extending in the vertical direction.

[0032] In one embodiment, the front lens assembly further includes:

[0033] a front reflector, disposed between the first dichroic mirror and the second dichroic mirror, capable of allowing a mixed light of visible light and long-wave infrared to pass through, and used for reflecting the light onto the first dichroic mirror;

[0034] a front first lens, disposed between the front reflector and the first dichroic mirror, the front first lens being a biconcave spherical lens with negative optical power; and,

[0035] The front second lens is arranged between the front reflector and the front first lens, and the front second lens is a meniscus spherical surface with positive optical power.

[0036] In one embodiment, the medium wave lens group includes a medium wave first lens, a medium wave second lens, a medium wave third lens, a medium wave fourth lens, a medium wave fifth lens, a medium wave sixth lens, a medium wave seventh lens and a medium wave eighth lens which are sequentially arranged along the optical path direction of the medium wave infrared light, the medium wave first lens is a meniscus aspheric lens with positive focal length, the medium wave second lens is a meniscus aspheric lens with positive focal length, the medium wave third lens is a meniscus aspheric lens with positive focal length, the medium wave fourth lens is a meniscus aspheric lens with negative focal length, the medium wave fifth lens is a meniscus aspheric lens with positive focal length, the medium wave sixth lens is a meniscus aspheric lens with positive focal length, the medium wave seventh lens is a meniscus aspheric lens with positive focal length, and the medium wave eighth lens is a meniscus spherical lens with negative focal length; and / or,

[0037] The visible light lens assembly further includes a first visible light lens, a second visible light lens, a third visible light lens, a fourth visible light lens, a fifth visible light lens, a sixth visible light lens, a seventh visible light lens, an eighth visible light lens, a ninth visible light lens, a tenth visible light lens, an eleventh visible light lens, a twelfth visible light lens, a thirteenth visible light lens, a fourteenth visible light lens, a fifteenth visible light lens and a sixteenth visible light lens, which are sequentially arranged along the optical path direction of the visible light. The first visible light lens is a meniscus spherical lens with positive focal power, the second visible light lens is a meniscus spherical lens with positive focal power, the third visible light lens is a meniscus moon lens with positive focal power, the fourth visible light lens is a biconcave spherical lens with negative focal power, and the fifth visible light lens is a negative focal power. The visible light sixth lens is a meniscus spherical lens with negative focal power, the visible light seventh lens is a biconvex spherical lens with positive focal power, the visible light eighth lens is a meniscus spherical lens with positive focal power, the visible light ninth lens is a meniscus spherical lens with negative focal power, the visible light tenth lens is a meniscus spherical lens with positive focal power, the visible light eleventh lens is a meniscus spherical lens with positive focal power, the visible light twelfth lens is a biconvex spherical lens with positive focal power, the visible light thirteenth lens is a biconcave spherical lens with negative focal power, the visible light fourteenth lens is a biconvex spherical lens with positive focal power, the visible light fifteenth lens is a meniscus spherical lens with positive focal power, and the visible light sixteenth lens is a meniscus spherical lens with negative focal power; and / or,

[0038] The long-wave mirror group also includes a long-wave first lens, a long-wave second lens, a long-wave third lens, a long-wave fourth lens, a long-wave fifth lens, a long-wave sixth lens, a long-wave seventh lens and a long-wave eighth lens which are sequentially arranged along the optical path direction of the long-wave infrared light. The long-wave first lens is a meniscus-type aspheric lens with positive focal power, the long-wave second lens is a meniscus-type aspheric lens with negative focal power, the long-wave third lens is a meniscus-type aspheric lens with positive focal power, the long-wave fourth lens is a meniscus-type aspheric lens with positive focal power, the long-wave fifth lens is a meniscus-type aspheric lens with positive focal power, the long-wave sixth lens is a meniscus-type aspheric lens with positive focal power, the long-wave seventh lens is a meniscus-type aspheric lens with positive focal power, and the long-wave eighth lens is a meniscus-type aspheric lens with negative focal power.

[0039] In the technical solution of the utility model, the multi-band mixed light first irradiates the first dichroic mirror of the front mirror group, and the first dichroic mirror can decompose the multi-band mixed light incident in the transverse direction into medium-wave infrared light and mixed light of visible light and long-wave infrared light emitted in the transverse direction and in opposite directions. At this time, the medium-wave infrared light will be incident on the medium-wave mirror group, corrected, turned, and adjusted by the medium-wave mirror group to converge on the focal plane of the medium-wave detector, and the mixed light of visible light and long-wave infrared will first irradiate the second dichroic mirror, the visible light will be reflected on the second dichroic mirror, and the long-wave infrared light will pass through the second dichroic mirror, wherein the visible light will be irradiated on the visible light mirror group, corrected, turned, and adjusted by the visible light mirror group to converge on the focal plane of the visible light detector, and the long-wave infrared light will be irradiated on the long-wave mirror group, corrected, turned, and adjusted by the long-wave mirror group to converge on the focal plane of the long-wave detector. With such arrangement, the multi-band mixed light is decomposed into visible light, medium-wave infrared light and long-wave infrared light by the first dichroic mirror and the second dichroic mirror, so that the optical paths of the three light rays are independent of each other, and then correction processing is performed respectively, so that the multi-band optical system can quickly, accurately and in real time detect target feature information in the three bands of visible light, medium-wave and long-wave infrared, without the need to convert the optical path and without time difference, thereby improving the response efficiency of the system, effectively solving the problem of target information loss due to conversion of the optical path, and providing favorable conditions for detection and recognition algorithm processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0041] Figure 1 A schematic structural diagram of an embodiment of a multi-band optical system provided by the utility model;

[0042] Figure 2 for Figure 1 A schematic diagram of the structure of the front mirror group in FIG.

[0043] Figure 3 for Figure 1 Schematic diagram of the structure of the medium wave mirror group;

[0044] Figure 4 for Figure 1 Schematic diagram of the structure of the visible light mirror group;

[0045] Figure 5 for Figure 1 Schematic diagram of the structure of the long-wave mirror group;

[0046] Figure 6 for Figure 1 The visible light MTF curve of the multi-band optical system at room temperature +20℃;

[0047] Figure 7 for Figure 1 The visible light MTF curve of the multi-band optical system at low temperature of -55℃;

[0048] Figure 8 for Figure 1 The visible light MTF curve of the multi-band optical system at high temperature +70℃;

[0049] Fig. 9 for Figure 1 The long-wave infrared MTF curve of the multi-band optical system at room temperature +20℃;

[0050] Fig.10 for Figure 1 The long-wave infrared MTF curve of the multi-band optical system at low temperature of -40℃;

[0051] Fig.11 for Figure 1 The long-wave infrared MTF curve of the multi-band optical system at high temperature +60℃;

[0052] Fig.12 for Figure 1 The mid-wave infrared MTF curve of the multi-band optical system at room temperature +20℃;

[0053] Fig.13 for Figure 1 The mid-wave infrared MTF curve of the multi-band optical system at low temperature of -40℃;

[0054] Fig.14 for Figure 1 MTF curve of the multi-band optical system at high temperature +60℃ in the mid- and long-wave infrared.

[0055] Description of Figure Numbers:

[0056] 100. Multi-band optical system; 1. Front mirror group; 11. First dichroic mirror; 12. Front reflector; 13. Front first lens; 14. Front second lens; 2. Second beam splitter; 3. Medium wave mirror group; 31. Medium wave first reflector; 32. Medium wave second reflector; 33. Medium wave galvanometer; 34. Medium wave third reflector; 35. Medium wave first lens; 36. Medium wave second lens; 37. Medium wave third lens; 38. Medium wave fourth lens; 39. Medium wave fifth lens; 310. Medium wave sixth lens; 311. Medium wave seventh lens; 312. Medium wave eighth lens; 4. Visible light mirror group; 41. Visible light first reflector; 42. Visible light galvanometer; 43. Visible light second reflector; 44. Visible light first lens; 45. Visible light second lens; 46. Visible light third lens; 47. Visible light fourth lens ; 48, the fifth lens of visible light; 49, the sixth lens of visible light; 410, the seventh lens of visible light; 411, the eighth lens of visible light; 412, the ninth lens of visible light; 413, the tenth lens of visible light; 414, the eleventh lens of visible light; 415, the twelfth lens of visible light; 416, the thirteenth lens of visible light; 417, the fourteenth lens of visible light; 418, the fifteenth lens of visible light; 419, the sixteenth lens of visible light; 5, long-wave mirror group; 51, the first long-wave reflector; 52, the long-wave galvanometer; 53, the second long-wave reflector; 54, the third long-wave reflector; 55, the first long-wave lens; 56, the second long-wave lens; 57, the third long-wave lens; 57, the fourth long-wave lens; 59, the fifth long-wave lens; 510, the sixth long-wave lens; 511, the seventh long-wave lens; 512, the eighth long-wave lens.

[0057] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0059] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0060] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0061] The utility model provides a multi-band optical system.

[0062] See also Figure 1-5 In one embodiment of the utility model, the multi-band optical system 100 includes a front mirror group 1, a second dichroic mirror, a medium-wave mirror group 3, a visible light mirror group 4 and a long-wave mirror group 5. The front mirror group 1 includes a first dichroic mirror 11, and the first dichroic mirror 11 is used to decompose the light incident along the transverse direction into medium-wave infrared light and a mixed light of visible light and long-wave infrared light emitted along the transverse direction and in opposite directions. The second dichroic mirror is arranged on one side of the front mirror group 1 along the transverse direction and is located on the emission path of the mixed light of visible light and long-wave infrared. The second dichroic mirror is used to decompose the mixed light of visible light and long-wave infrared light. The combined light is decomposed into visible light emitted along the longitudinal direction and long-wave infrared light emitted along the transverse direction. The medium-wave mirror group 3 is arranged on the emission path of the medium-wave infrared light. The medium-wave mirror group 3 is used to correct the medium-wave infrared light and converge it on the focal plane of the medium-wave detector. The visible light mirror group 4 is arranged on the emission path of the visible light. The visible light mirror group 4 is used to correct the visible light and converge it on the focal plane of the visible light detector. The long-wave mirror group 5 is arranged on the emission path of the long-wave infrared light. The long-wave mirror group 5 is used to correct the long-wave infrared light and converge it on the focal plane of the long-wave detector.

[0063] In the technical solution of the utility model, the multi-band mixed light first irradiates the first dichroic mirror 11 of the front mirror group 1, and the first dichroic mirror 11 can decompose the multi-band mixed light incident in the transverse direction into the medium-wave infrared light and the mixed light of the visible light and the long-wave infrared light which are emitted in the transverse direction and in the opposite direction. At this time, the medium-wave infrared light will be incident on the medium-wave mirror group 3, and will be corrected, turned, and adjusted by the medium-wave mirror group 3 to converge on the focal plane of the medium-wave detector, while the mixed light of the visible light and the long-wave infrared will first irradiate on the second dichroic mirror, and the visible light will be reflected on the second dichroic mirror, while the long-wave infrared light will pass through the second dichroic mirror, wherein the visible light will be irradiated on the visible light mirror group 4, and will be corrected, turned, and adjusted by the visible light mirror group 4 to converge on the focal plane of the visible light detector, and the long-wave infrared light will be irradiated on the long-wave mirror group 5, and will be corrected, turned, and adjusted by the long-wave mirror group 5 to converge on the focal plane of the long-wave detector. With such arrangement, the multi-band mixed light is decomposed into visible light, medium-wave infrared light and long-wave infrared light by the first dichroic mirror 11 and the second dichroic mirror, so that the optical paths of the three light rays are independent of each other, and then correction processing is performed respectively, so that the multi-band optical system 100 can quickly, accurately and in real time detect target feature information in the three bands of visible light, medium-wave and long-wave infrared, without the need to convert the optical path and without time difference, thereby improving the response efficiency of the system, effectively solving the problem of target information loss due to the conversion of the optical path, and providing favorable conditions for detection and recognition algorithm processing.

[0064] It can be understood that, in the present invention, the first dichroic mirror 11 is specifically a meniscus reflector with negative optical focal length, and the first dichroic mirror 11 only reflects a mixed light of visible light and long-wave infrared, so that the mixed light of visible light and long-wave infrared is emitted toward the second dichroic mirror, while the medium-wave infrared light will continue to be emitted forward through the first dichroic mirror 11.

[0065] It should be noted that the material of the first dichroic mirror 11 is single crystal silicon and is a quadratic hyperboloid. Such a configuration can reduce the off-axis aberration while reducing the spatial size of the multi-band optical system 100, thereby realizing the integrated design and simultaneous imaging of medium wave, visible light and long-wave infrared.

[0066] In addition, in order to ensure that the second dichroic mirror can decompose the mixed light of visible light and long-wave infrared light into visible light emitted along the longitudinal direction and long-wave infrared light emitted along the transverse direction, in one embodiment of the utility model, the second dichroic mirror is tilted at an angle of 45°. In this way, not only the emission angles of visible light and long-wave infrared light are guaranteed, but also the imaging quality of visible light and long-wave infrared can be improved.

[0067] Furthermore, the front lens group 1 adopts a Cassegrain structure, which can meet the size requirements of long focal length and large aperture, and reduce structural complexity and production costs.

[0068] Specifically, see Figure 2 In one embodiment of the utility model, the front mirror group 1 also includes a front reflector 12, a front first lens 13 and a front second lens 14. The front reflector 12 is arranged between the first dichroic mirror 11 and the second dichroic mirror, and can allow mixed light of visible light and long-wave infrared to pass through. The front reflector 12 is used to reflect the light onto the first dichroic mirror 11. The front first lens 13 is arranged between the front reflector 12 and the first dichroic mirror 11. The front first lens 13 is a double concave spherical lens with negative optical power. The front second lens 14 is arranged between the front reflector 12 and the front first lens 13. The front second lens 14 is a meniscus spherical surface with positive optical power. With such arrangement, the multi-band mixing pipeline first irradiates the front reflector 12, and then irradiates the first dichroic mirror 11 after being reflected by the front reflector 12. When the multi-band mixed light irradiates the first dichroic mirror 11, the medium-wave infrared light will pass through the first dichroic mirror 11 and irradiate the medium-wave mirror group 3, while the mixed light of visible light and long-wave infrared will be reflected on the first dichroic mirror 11, and will sequentially pass through the front first lens 13 and the front second lens 14 to irradiate the second dichroic mirror for the next step of color separation. The arrangement of the front first lens 13 and the front second lens 14 can correct the off-axis aberration of the mixed light of visible light and long-wave infrared, thereby improving the imaging quality of subsequent visible light and long-wave infrared light.

[0069] In order to ensure that the front first lens 13 and the front second lens 14 can allow visible light and long-wave infrared light to pass through at the same time, the front first lens 13 and the front second lens 14 are both zinc sulfide lenses. In this way, combined with the spherical structure, the front first lens 13 and the front second lens 14 can meet the processing and adjustment requirements while performing off-axis aberration correction.

[0070] At the same time, in order to ensure the stability of the optical path in the front mirror group 1, in one embodiment, the front reflector 12 is specifically a quadratic parabola, and the material is single crystal silicon. This configuration can enable the front reflector 12 to have the advantages of high temperature resistance and a small thermal expansion coefficient.

[0071] Furthermore, in order to further meet the miniaturization performance of the multi-band optical system 100, in one embodiment, the medium-wave mirror group 3 is located at a side of the front mirror group 1 away from the second dichroic mirror 2 and is extended in the longitudinal direction. The medium-wave mirror group 3 is used to correct the medium-wave infrared light emitted from the first dichroic mirror 11 to be emitted in the horizontal direction from the one side of the first dichroic mirror 11 in the longitudinal direction; the visible light mirror group 4 is located at one side of the second dichroic mirror in the longitudinal direction, and the visible light mirror group 4 is used to correct the visible light emitted from the second dichroic mirror to be emitted in the horizontal direction from the one side of the second dichroic mirror in the longitudinal direction, and the emission direction is opposite to the medium-wave infrared light; the long-wave mirror group 5 is located at a side of the second dichroic mirror away from the first dichroic mirror 11 and is extended in the longitudinal direction. The long-wave mirror group 5 is used to correct the long-wave infrared light emitted from the second dichroic mirror to be emitted in the horizontal direction from the other side of the second dichroic mirror in the longitudinal direction, and the emission direction is opposite to the medium-wave infrared light. By reasonably combining the medium-wave mirror group 3, the visible light mirror group 4 and the long-wave mirror group 5, the optical paths of the medium-wave infrared light, the visible light and the long-wave infrared light are adjusted, so as to further reduce the spatial size of the multi-band optical system 100 by optimizing the optical path, thereby meeting the miniaturization performance of the multi-band optical system 100.

[0072] In one embodiment of the present invention, please refer to Figure 3 The medium wave mirror group 3 includes a medium wave first reflector 31, a medium wave second reflector 32, a medium wave galvanometer 33 and a medium wave third reflector 34. The medium wave first reflector 31 is arranged at a distance from the first dichroic mirror 11 on a side away from the second dichroic mirror. The medium wave first reflector 31 is used to change the medium wave infrared light emitted from the first dichroic mirror 11 to be emitted in the longitudinal direction. The medium wave second reflector 32 is arranged at a distance from the upper side of the medium wave first reflector 31 and is arranged to intersect with the medium wave first reflector 31. The medium wave second reflector 32 is used to change the medium wave infrared light emitted from the first dichroic mirror 11 to be emitted in the longitudinal direction. 1 changes the medium-wave infrared light emitted from the second medium-wave reflector 32 to be emitted in the horizontal direction, the medium-wave galvanometer 33 is arranged at a distance on one side of the second medium-wave reflector 32 in the horizontal direction, and is arranged in parallel with the second medium-wave reflector 32, the medium-wave galvanometer 33 is used to change the medium-wave infrared light emitted from the second medium-wave reflector 32 to be emitted in the vertical direction, the medium-wave third reflector 34 is arranged at a distance on one side of the medium-wave galvanometer 33 away from the front mirror group 1, and is arranged to intersect with the medium-wave galvanometer 33, the medium-wave third reflector 34 is used to change the medium-wave infrared light emitted from the medium-wave galvanometer 33 to be emitted in the horizontal direction.

[0073] It can be understood that in this embodiment, the medium-wave infrared light is refracted multiple times by the medium-wave first reflector 31, the medium-wave second reflector 32, the medium-wave galvanometer 33 and the medium-wave third reflector 34 to achieve the purpose of adjusting the optical path of the medium-wave infrared light. At the same time, the medium-wave mirror group 3 also adopts a secondary imaging structure to achieve the miniaturization of the multi-band optical system 100.

[0074] In addition, in another embodiment of the utility model, the medium wave lens group 3 further includes a medium wave first lens 35, a medium wave second lens 36, a medium wave third lens 37, a medium wave fourth lens 38, a medium wave fifth lens 39, a medium wave sixth lens 310, a medium wave seventh lens 311 and a medium wave eighth lens 312 which are sequentially arranged along the optical path direction of the medium wave infrared light. The medium wave first lens 35 is a meniscus aspheric lens with positive focal length, the medium wave second lens 36 is a meniscus aspheric lens with positive focal length, the medium wave third lens 37 is a meniscus aspheric lens with positive focal length, and the medium wave first lens 35 is a meniscus aspheric lens with positive focal length. The medium wave fourth lens 38 is a meniscus aspheric lens with negative optical focal length, the medium wave fifth lens 39 is a meniscus aspheric lens with positive optical focal length, the medium wave sixth lens 310 is a meniscus aspheric lens with positive optical focal length, the medium wave seventh lens 311 is a meniscus aspheric lens with positive optical focal length, and the medium wave eighth lens 312 is a meniscus spherical lens with negative optical focal length. The multiple lenses of the medium wave lens group 3 can cooperate with each other, and at the same time adopt a secondary imaging design method to ensure that the cold stop here in the multi-band optical system 100 is matched, and 100% cold stop efficiency is achieved.

[0075] It should be noted that, in one embodiment of the present utility model, the medium-wave first lens 35 is a germanium lens, the medium-wave second lens 36 is a silicon lens, the medium-wave third lens 37 is a germanium lens, the medium-wave fourth lens 38 is a silicon lens, the medium-wave fifth lens 39 is a silicon lens, the medium-wave sixth lens 310 is a germanium lens, the medium-wave seventh lens 311 is a silicon lens, and the medium-wave eighth lens 312 is a calcium fluoride lens.

[0076] In addition, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is concave, and the image side surface is convex; the object side surface of the fifth lens is convex, and the image side surface is concave; the object side surface of the sixth lens is concave, and the image side surface is convex; the object side surface of the seventh lens is convex, and the image side surface is concave; the object side surface of the eighth lens is convex, and the image side surface is concave.

[0077] Further, in one embodiment of the utility model, the medium-wavelength galvanometer 33 is arranged to rotate along an axis extending in the vertical direction. With such arrangement, the multi-band optical system 100 has a fixed working state and a reciprocating scanning working state. When the multi-band optical system 100 is in the fixed working state, the medium-wavelength galvanometer 33 and the second beam splitter 2 are arranged in parallel to be able to fold the optical path by 90°, so that the medium-wavelength infrared lens of the multi-band optical system 100 is in a multi-band composite gaze tracking mode; when the multi-band optical system 100 is in the reciprocating scanning working state, the whole of the multi-band optical system 100 rotates in a certain direction, and the medium-wavelength galvanometer 33 rotates in the opposite direction to the whole of the multi-band optical system 100, thereby realizing dynamic image shift compensation for medium-wavelength infrared imaging, and the stable imaging of the medium-wavelength infrared lens of the multi-band optical system 100 is realized through the reciprocating motion of the medium-wavelength galvanometer 33.

[0078] See also Figure 9-11 In the present utility model, the medium-wave infrared has a 0-field MTF ≥ 0.4 at room temperature and 32lp, and a 0.8-field MTF ≥ 0.35.

[0079] See also Figure 4 In another embodiment of the utility model, the visible light mirror group 4 includes a first visible light reflector 41, a visible light galvanometer 42 and a second visible light reflector 43. The first visible light reflector 41 is arranged at intervals on one side of the second dichroic mirror in the longitudinal direction and is arranged in parallel with the second dichroic mirror. The first visible light reflector 41 is used to change the visible light emitted from the second dichroic mirror to be emitted in the transverse direction. The visible light galvanometer 42 is arranged at intervals on one side of the first visible light reflector 41 in the transverse direction and is arranged to intersect with the first visible light reflector 41. The visible light galvanometer 42 is used to change the visible light emitted from the first visible light reflector 41 to be emitted in the longitudinal direction. The second visible light reflector 43 is arranged at intervals on one side of the visible light galvanometer 42 in the longitudinal direction and is arranged in parallel with the visible light galvanometer 42. The second visible light reflector 43 is used to change the visible light emitted from the visible light galvanometer 42 to be emitted in the transverse direction.

[0080] It can be understood that, in this embodiment, the visible light is refracted multiple times by the first visible light reflector 41, the visible light galvanometer 42 and the second visible light reflector 43 to achieve the purpose of adjusting the optical path of the visible light. At the same time, since the visible light mirror group 4 does not need to consider the problem of cold stop matching, the visible light mirror group 4 also adopts a one-time imaging structure, thereby realizing the miniaturization of the multi-band optical system 100.

[0081] Further, the visible light lens group 4 also includes a first visible light lens 44, a second visible light lens 45, a third visible light lens 46, a fourth visible light lens 47, a fifth visible light lens, a sixth visible light lens 49, a seventh visible light lens 410, an eighth visible light lens 411, a ninth visible light lens 412, a tenth visible light lens 413, an eleventh visible light lens 414, a twelfth visible light lens 415, a thirteenth visible light lens 416, a fourteenth visible light lens 417, a fifteenth visible light lens 418 and a sixteenth visible light lens 419, the first visible light lens 44 is a meniscus spherical lens with positive focal power, the second visible light lens 45 is a meniscus spherical lens with positive focal power, the third visible light lens 46 is a meniscus moon lens with positive focal power, the fourth visible light lens 47 is a double concave spherical lens with negative focal power, and the fifth visible light lens 4 8 is a biconcave spherical lens with negative focal power, the visible light sixth lens 49 is a meniscus spherical lens with negative focal power, the visible light seventh lens 410 is a biconvex spherical lens with positive focal power, the visible light eighth lens 411 is a meniscus spherical lens with positive focal power, the visible light ninth lens 412 is a meniscus spherical lens with negative focal power, the visible light tenth lens 413 is a meniscus spherical lens with positive focal power, the visible light eleventh lens 414 is a meniscus spherical lens with positive focal power, the visible light twelfth lens 415 is a biconvex spherical lens with positive focal power, the visible light thirteenth lens 416 is a biconcave spherical lens with negative focal power, the visible light fourteenth lens 417 is a biconvex spherical lens with positive focal power, the visible light fifteenth lens 418 is a meniscus spherical lens with positive focal power, and the visible light sixteenth lens 419 is a meniscus spherical lens with negative focal power. Through the cooperation of multiple visible light lenses, clear imaging in the visible light band can be achieved.

[0082] It is understandable that the heads of the visible light lens group 4 all use glass spherical lenses. Such an arrangement can not only ensure the high yield advantage of processing and assembly, thereby further reducing costs, but also ensure the high reliability of the product, thereby enabling the visible light lens group 4 to meet military standards.

[0083] In addition, in one embodiment of the present invention, the first visible light lens 44 is a H-ZPK7 lens, the second visible light lens 45 is a H-ZF51 lens, the third visible light lens 46 is a H-FK61 lens, the fourth visible light lens 47 is a H-ZF11 lens, the fifth visible light lens 48 is a H-LAK53A lens, the sixth visible light lens 49 is a H-ZBAF3 lens, the seventh visible light lens 410 is a H-LAK53A lens, and the eighth visible light lens 411 is a H-ZK3 lens. The ninth visible light lens 412 is a H-LAF62 lens, the tenth visible light lens 413 is a H-LAK4L lens, the eleventh visible light lens 414 is a H-LAK11 lens, the twelfth visible light lens 415 is a H-FK71 lens, the thirteenth visible light lens 416 is a H-ZLAF76 lens, the fourteenth visible light lens 417 is a H-ZF52A lens, the fifteenth visible light lens 418 is a H-ZLAF76 lens, and the sixteenth visible light lens 419 is a H-ZF72A lens.

[0084] It can be understood that the multiple lenses of the visible light mirror set 4 are all made of glass such as ZPK7 and ZF51. In this way, the performance of the visible light mirror set 4 can be guaranteed to be stable while reducing the cost of the visible light mirror set 4.

[0085] Furthermore, the object side surface of the first visible light lens 44 is convex, and the image side surface is concave; the object side surface of the second visible light lens 45 is convex, and the image side surface is concave; the object side surface of the third visible light lens 46 is convex, and the image side surface is concave; the object side surface of the fourth visible light lens 47 is concave, and the image side surface is concave; the object side surface of the fifth visible light lens 48 is concave, and the image side surface is concave; the object side surface of the sixth visible light lens 49 is concave, and the image side surface is convex; the object side surface of the seventh visible light lens 410 is convex, and the image side surface is convex; the object side surface of the eighth visible light lens 411 is concave, and the image side surface is convex; The object side surface of the visible light ninth lens 412 is concave, and the image side surface is convex; the object side surface of the visible light tenth lens 413 is concave, and the image side surface is convex; the object side surface of the visible light eleventh lens 414 is convex, and the image side surface is concave; the object side surface of the visible light twelfth lens 415 is convex, and the image side surface is convex; the object side surface of the visible light thirteenth lens 416 is concave, and the image side surface is concave; the object side surface of the visible light fourteenth lens 417 is convex, and the image side surface is convex; the object side surface of the visible light fifteenth lens 418 is convex, and the image side surface is concave; the object side surface of the visible light sixteenth lens 419 is concave, and the image side surface is convex.

[0086] It can be understood that, in this embodiment, the visible light third lens 46 and the visible light fourth lens 47 are glued together, the visible light eighth lens 411 and the visible light ninth lens 412 are glued together, and the visible light twelfth lens 415 and the visible light thirteenth lens 416 are glued together.

[0087] Further, in one embodiment of the utility model, the visible light galvanometer 42 is arranged to rotate along an axis extending in the vertical direction. With such arrangement, the multi-band optical system 100 has a fixed working state and a reciprocating scanning working state. When the multi-band optical system 100 is in the fixed working state, the visible light galvanometer 42 and the first beam splitter are arranged in parallel to be able to fold the optical path by 90°, so that the visible light lens of the multi-band optical system 100 is in a multi-band composite gaze tracking mode; when the multi-band optical system 100 is in the reciprocating scanning working state, the whole of the multi-band optical system 100 rotates in a certain direction, and the visible light galvanometer 42 rotates in the opposite direction to the whole of the multi-band optical system 100, thereby realizing dynamic image shift compensation for visible light imaging, and through the reciprocating motion of the visible light galvanometer 42, stable imaging of the visible light lens of the multi-band optical system 100 is realized.

[0088] See also Figure 6-8 In the present invention, the MTF of visible light at room temperature and 100lp is ≥0.35 in 0 field of view, and MTF is ≥0.3 in 0.8 field of view.

[0089] See also Figure 5 In another embodiment of the present invention, the long-wave mirror group 5 includes a long-wave first reflector 51, a long-wave galvanometer 52, a long-wave second reflector 53, and a long-wave third reflector 54. The long-wave first reflector 51 is arranged at a distance from the second dichroic mirror on a side away from the first dichroic mirror 11, and is arranged to intersect with the second dichroic mirror. The long-wave first reflector 51 is used to change the long-wave infrared light emitted from the second dichroic mirror to be emitted in the longitudinal direction. The long-wave galvanometer 52 is arranged on one side of the long-wave first reflector 51 in the longitudinal direction, and is arranged to intersect with the long-wave first reflector 51. The long-wave galvanometer 52 is used to The long-wave infrared light emitted from the long-wave first reflector 51 is changed to be emitted in the horizontal direction. The long-wave second reflector 53 is arranged on one side of the long-wave galvanometer 52 in the horizontal direction and is arranged in parallel with the long-wave galvanometer 52. The long-wave second reflector 53 is used to change the long-wave infrared light emitted from the long-wave galvanometer 52 to be emitted in the vertical direction. The long-wave third reflector 54 is arranged on one side of the long-wave second reflector 53 in the vertical direction and is rubber-set with the long-wave second reflector 53. The long-wave third reflector 54 is used to change the long-wave infrared light emitted from the long-wave second reflector 53 to be emitted in the horizontal direction.

[0090] It can be understood that, in this embodiment, the long-wave infrared light is refracted multiple times by the long-wave first reflector 51, the long-wave second reflector 53, the long-wave galvanometer 52 and the long-wave third reflector 54 to achieve the purpose of adjusting the optical path of the long-wave infrared light. At the same time, the long-wave mirror group 5 also adopts a secondary imaging structure to achieve the miniaturization of the multi-band optical system 100.

[0091] In addition, in another embodiment of the utility model, the long-wave mirror group 5 further includes a long-wave first lens 55, a long-wave second lens 56, a long-wave third lens 57, a long-wave fourth lens 57, a long-wave fifth lens 59, a long-wave sixth lens 510, a long-wave seventh lens 511 and a long-wave eighth lens 512 which are sequentially arranged along the optical path direction of the long-wave infrared light. The long-wave first lens 55 is a meniscus aspherical lens with positive focal length, and the long-wave second lens 56 is a negative focal length. Meniscus type aspheric lens, the long-wave third lens 57 is a meniscus type aspheric lens with positive focal length, the long-wave fourth lens 57 is a meniscus type aspheric lens with positive focal length, the long-wave fifth lens 59 is a meniscus type aspheric lens with positive focal length, the long-wave sixth lens 510 is a meniscus type aspheric lens with positive focal length, the long-wave seventh lens 511 is a meniscus type aspheric lens with positive focal length, and the long-wave eighth lens 512 is a meniscus type aspheric lens with negative focal length. The multiple lenses of the long-wave lens group 5 can cooperate with each other, and the secondary imaging design method is adopted at the same time, so as to ensure the cold stop matching of the multi-band optical system 100 here, and achieve 100% cold stop efficiency.

[0092] It should be noted that, in this embodiment, the long-wave first lens 55 is a germanium lens, the long-wave second lens 56 is a chalcogenide lens, the long-wave third lens 57 is a zinc selenide lens, the long-wave fourth lens 57 is a germanium lens, the long-wave fifth lens 59 is a germanium lens, the long-wave sixth lens 510 is a germanium lens, the long-wave seventh lens 511 is a germanium lens, and the long-wave eighth lens 512 is a zinc selenide lens.

[0093] In addition, the object side surface of the long-wave first lens 55 is convex, and the image side surface is concave; the object side surface of the long-wave second lens 56 is convex, and the image side surface is concave; the object side surface of the long-wave third lens 57 is concave, and the image side surface is convex; the object side surface of the long-wave fourth lens 57 is concave, and the image side surface is convex; the object side surface of the long-wave fifth lens 59 is concave, and the image side surface is convex; the object side surface of the long-wave sixth lens 510 is convex, and the image side surface is concave; the object side surface of the long-wave seventh lens 511 is convex, and the image side surface is concave; the object side surface of the long-wave eighth lens 512 is convex, and the image side surface is concave.

[0094] Further, in one embodiment of the utility model, the long-wave galvanometer 52 is arranged to rotate along an axis extending in the vertical direction. With such arrangement, the multi-band optical system 100 has a fixed working state and a reciprocating scanning working state. When the multi-band optical system 100 is in the fixed working state, the long-wave galvanometer 52 and the second beam splitter 2 are arranged in parallel to be able to fold the optical path by 90°, so that the long-wave infrared lens of the multi-band optical system 100 is in a multi-band composite gaze tracking mode; when the multi-band optical system 100 is in the reciprocating scanning working state, the whole of the multi-band optical system 100 rotates in a certain direction, and the long-wave galvanometer 52 rotates in the opposite direction to the whole of the multi-band optical system 100, thereby realizing dynamic image shift compensation for long-wave infrared imaging, and through the reciprocating motion of the long-wave galvanometer 52, stable imaging of the long-wave infrared lens of the multi-band optical system 100 is realized.

[0095] See also Figure 12-14 In the present utility model, the long-wave infrared has a 0-field MTF ≥ 0.25 at room temperature and 32lp, and a 0.8-field MTF ≥ 0.2.

[0096] In addition, the multi-band optical system 100 also includes a lens barrel, in which the front lens group 1, the second dichroic mirror, the medium-wave mirror group 3, the visible light mirror group 4 and the long-wave mirror group 5 are all located. The lens barrel is made of indium steel material, and the front reflector 12 and the first dichroic mirror 11 are connected by carbon fiber material to effectively reduce the influence of temperature changes on the interval between the primary and secondary mirrors.

[0097] See also Figure 6-14 The multi-band optical system 100 has high quality of visible light, medium-wave infrared, and long-wave infrared imaging, and the performance difference in various temperature states is not large, the consistency is good, and it can meet the use requirements of -55℃~+70℃ environment.

[0098] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A multi-band optical system, characterized in that: include: A front mirror group, comprising a first dichroic mirror, wherein the first dichroic mirror is used to decompose the light incident in the transverse direction into medium-wave infrared light and mixed light of visible light and long-wave infrared light emitted in the transverse direction and in opposite directions; A second dichroic mirror is disposed on one side of the front mirror group in the horizontal direction and is located on the emission path of the mixed light of visible light and long-wave infrared light, and the second dichroic mirror is used to decompose the mixed light of visible light and long-wave infrared light into visible light emitted in the longitudinal direction and long-wave infrared light emitted in the transverse direction; A medium wave mirror group is arranged on the emission path of the medium wave infrared light, and is used to correct the medium wave infrared light and focus it on the focal plane of the medium wave detector; A visible light lens set is arranged on the emission path of the visible light, and is used to correct the visible light and focus it on the focal plane of the visible light detector; and The long-wave mirror group is arranged on the emission path of the long-wave infrared light, and is used for correcting the long-wave infrared light and converging it on the focal plane of the long-wave detector.

2. The multi-band optical system according to claim 1, wherein: The medium-wave mirror group is located at a side of the front mirror group away from the second dichroic mirror and is extended in the longitudinal direction. The medium-wave mirror group is used to correct the medium-wave infrared light emitted from the first dichroic mirror to be emitted in the horizontal direction from one side of the first dichroic mirror in the longitudinal direction; The visible light mirror group is arranged on one side of the second dichroic mirror in the longitudinal direction, and the visible light mirror group is used to correct the visible light emitted from the second dichroic mirror to be emitted in the horizontal direction on one side of the second dichroic mirror in the longitudinal direction, and the emission direction is opposite to the medium-wave infrared light; The long-wave mirror group is arranged on a side of the second dichroic mirror away from the first dichroic mirror and is extended in the longitudinal direction. The long-wave mirror group is used to correct the long-wave infrared light emitted from the second dichroic mirror so that the second dichroic mirror emits it in the lateral direction on the other side in the longitudinal direction, and the emission direction is opposite to the medium-wave infrared light.

3. The multi-band optical system according to claim 2, wherein: The medium wave mirror assembly comprises: A medium-wave first reflector is arranged at a distance from the first dichroic mirror on a side away from the second dichroic mirror, and the medium-wave first reflector is used to change the medium-wave infrared light emitted from the first dichroic mirror to be emitted in the longitudinal direction; A medium-wave second reflector is arranged at intervals on the upper side of the medium-wave first reflector and is arranged to intersect with the medium-wave first reflector, and the medium-wave second reflector is used to change the medium-wave infrared light emitted from the medium-wave first reflector to be emitted in a lateral direction; A medium-wave galvanometer is arranged at intervals on one side of the medium-wave second reflector in the horizontal direction and is arranged in parallel with the medium-wave second reflector, and the medium-wave galvanometer is used to change the medium-wave infrared light emitted from the medium-wave second reflector to be emitted in the vertical direction; and The medium-wave third reflector is arranged at a distance from the medium-wave galvanometer on a side away from the front mirror group and is arranged to intersect with the medium-wave galvanometer. The medium-wave third reflector is used to change the medium-wave infrared light emitted from the medium-wave galvanometer to be emitted horizontally.

4. The multi-band optical system according to claim 3, wherein: The medium wave galvanometer is rotatably arranged along an axis extending in the vertical direction.

5. The multi-band optical system according to claim 2, wherein: The visible light mirror set comprises: a first visible light reflector, arranged at intervals on one side of the second dichroic mirror in the longitudinal direction and arranged in parallel with the second dichroic mirror, and used for changing the visible light emitted from the second dichroic mirror to be emitted in the lateral direction; A visible light galvanometer is arranged at intervals on one side of the first visible light reflector in the transverse direction and is arranged to intersect with the first visible light reflector, and the visible light galvanometer is used to change the visible light emitted from the first visible light reflector to be emitted in the longitudinal direction; and The second visible light reflector is arranged at a distance from the visible light galvanometer on one side in the longitudinal direction and is arranged in parallel with the visible light galvanometer. The second visible light reflector is used to change the visible light emitted from the visible light galvanometer to be emitted in the lateral direction.

6. The multi-band optical system according to claim 5, characterized in that: The visible light galvanometer is rotatably arranged along an axis extending in the vertical direction.

7. The multi-band optical system according to claim 2, wherein: The long-wave mirror group comprises: a long-wave first reflector, arranged at a distance from the second dichroic mirror on a side away from the first dichroic mirror and arranged to intersect with the second dichroic mirror, and used for changing the long-wave infrared light emitted from the second dichroic mirror to be emitted in the longitudinal direction; A long-wave galvanometer is arranged on one side of the long-wave first reflector along the longitudinal direction and is arranged to intersect with the long-wave first reflector, and the long-wave galvanometer is used to change the long-wave infrared light emitted from the long-wave first reflector to be emitted in the lateral direction; A long-wave second reflector is arranged on one side of the long-wave galvanometer along the horizontal direction and is arranged in parallel with the long-wave galvanometer, and the long-wave second reflector is used to change the long-wave infrared light emitted from the long-wave galvanometer to be emitted along the vertical direction; and, The long-wave third reflector is arranged on one side of the long-wave second reflector along the longitudinal direction and is rubber-set with the long-wave second reflector. The long-wave third reflector is used to change the long-wave infrared light emitted from the long-wave second reflector to be emitted in the lateral direction.

8. The multi-band optical system according to claim 7, wherein: The long-wave galvanometer is rotatably arranged along an axis extending in the vertical direction.

9. The multi-band optical system according to claim 1, wherein: The front mirror assembly also includes: a front reflector, disposed between the first dichroic mirror and the second dichroic mirror, capable of allowing a mixed light of visible light and long-wave infrared to pass through, and used for reflecting the light onto the first dichroic mirror; a front first lens, disposed between the front reflector and the first dichroic mirror, the front first lens being a biconcave spherical lens with negative optical power; and, The front second lens is arranged between the front reflector and the front first lens, and the front second lens is a meniscus spherical surface with positive optical power.

10. The multi-band optical system according to claim 1, wherein: The medium wave lens group comprises a medium wave first lens, a medium wave second lens, a medium wave third lens, a medium wave fourth lens, a medium wave fifth lens, a medium wave sixth lens, a medium wave seventh lens and a medium wave eighth lens which are sequentially arranged along the optical path direction of the medium wave infrared light, the medium wave first lens is a meniscus aspheric lens with positive focal length, the medium wave second lens is a meniscus aspheric lens with positive focal length, the medium wave third lens is a meniscus aspheric lens with positive focal length, the medium wave fourth lens is a meniscus aspheric lens with negative focal length, the medium wave fifth lens is a meniscus aspheric lens with positive focal length, the medium wave sixth lens is a meniscus aspheric lens with positive focal length, the medium wave seventh lens is a meniscus aspheric lens with positive focal length, and the medium wave eighth lens is a meniscus spherical lens with negative focal length; and / or, The visible light lens assembly further includes a first visible light lens, a second visible light lens, a third visible light lens, a fourth visible light lens, a fifth visible light lens, a sixth visible light lens, a seventh visible light lens, an eighth visible light lens, a ninth visible light lens, a tenth visible light lens, an eleventh visible light lens, a twelfth visible light lens, a thirteenth visible light lens, a fourteenth visible light lens, a fifteenth visible light lens and a sixteenth visible light lens, which are sequentially arranged along the optical path direction of the visible light. The first visible light lens is a meniscus spherical lens with positive focal power, the second visible light lens is a meniscus spherical lens with positive focal power, the third visible light lens is a meniscus moon lens with positive focal power, the fourth visible light lens is a biconcave spherical lens with negative focal power, and the fifth visible light lens is a negative focal power. The visible light sixth lens is a meniscus spherical lens with negative focal power, the visible light seventh lens is a biconvex spherical lens with positive focal power, the visible light eighth lens is a meniscus spherical lens with positive focal power, the visible light ninth lens is a meniscus spherical lens with negative focal power, the visible light tenth lens is a meniscus spherical lens with positive focal power, the visible light eleventh lens is a meniscus spherical lens with positive focal power, the visible light twelfth lens is a biconvex spherical lens with positive focal power, the visible light thirteenth lens is a biconcave spherical lens with negative focal power, the visible light fourteenth lens is a biconvex spherical lens with positive focal power, the visible light fifteenth lens is a meniscus spherical lens with positive focal power, and the visible light sixteenth lens is a meniscus spherical lens with negative focal power; and / or, The long-wave mirror group also includes a long-wave first lens, a long-wave second lens, a long-wave third lens, a long-wave fourth lens, a long-wave fifth lens, a long-wave sixth lens, a long-wave seventh lens and a long-wave eighth lens which are sequentially arranged along the optical path direction of the long-wave infrared light. The long-wave first lens is a meniscus-type aspheric lens with positive focal power, the long-wave second lens is a meniscus-type aspheric lens with negative focal power, the long-wave third lens is a meniscus-type aspheric lens with positive focal power, the long-wave fourth lens is a meniscus-type aspheric lens with positive focal power, the long-wave fifth lens is a meniscus-type aspheric lens with positive focal power, the long-wave sixth lens is a meniscus-type aspheric lens with positive focal power, the long-wave seventh lens is a meniscus-type aspheric lens with positive focal power, and the long-wave eighth lens is a meniscus-type aspheric lens with negative focal power.

Images