CN105223699A - A kind of visible light/infrared light two waveband optical system - Google Patents
A kind of visible light/infrared light two waveband optical system Download PDFInfo
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- CN105223699A CN105223699A CN201510626350.3A CN201510626350A CN105223699A CN 105223699 A CN105223699 A CN 105223699A CN 201510626350 A CN201510626350 A CN 201510626350A CN 105223699 A CN105223699 A CN 105223699A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/17—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +--
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
Abstract
The present invention relates to a kind of visible light/infrared light two waveband optical system, comprise principal reflection mirror, secondary mirror, beam-splitter, visible channel subsystem and infrared channel subsystem.Wherein, secondary mirror can be cut and cut out from light path, and when secondary mirror cuts out, light enters respectively in visible ray and infrared channel subsystem and carries out imaging after beam-splitter light splitting, and now, this optical system is in the continuous vari-focus state of short Jiao; Cut in light path when continuous vari-focus is in minimum visual field by secondary mirror, light carries out imaging by entering respectively after beam-splitter light splitting in visible ray and infrared channel subsystem after principal reflection mirror and secondary mirror, and now, system is all in focal length and focuses state.The pattern of Shared aperture common light path rear end, this optical system employing front end separate imaging, utilizes continuous vari-focus to search for target when can realize short Jiao and focal length end is followed the tracks of target, identifies and aimed at, and can realize the long-focus of system, miniaturization.
Description
Technical field
The present invention relates to a kind of visible light/infrared light two waveband optical system, belong to continuous zooming optical equipment technical field.
Background technology
In industrial detection and national defense and military application, in order to find target fast, timely and realize the real-time follow-up of target and accurately measure under different external environment, the visible images obtaining target should be asked, also need the infrared image obtaining target.Along with the development of society, the optical system of single wave band is more and more difficult to satisfied actual user demand, multiband even all band hybrid optical system is developed rapidly, and the optical system that multiband optical system and varifocal optical system combine is because its observation scope is wide, measurement is accurately widely applied.Zoom system is that a kind of focal length can consecutive variations, and image planes keep stable, and picture element keeps good optical system in zooming procedure.Its visible luminous energy of the two waveband optical system of visible ray and infrared combination is accepted by human eye, observation is convenient, and under night and poor light condition, and have mist or have block time infrared system there is good smog, dust penetration capacity, affected by environment little without limiting round the clock, the advantages such as good concealment.The visible light wave range when observation condition is good, observed with infrared light path during, night more weak in light intensity, and both are with the use of speed and the efficiency that effectively can improve tracking and measurement target.
And for high altitude surveillance or scouting striking type large scale computer carrying platform, be improve target detection/recognition capability, spatial resolution is high, operating distance far away, identification probability high to require the optical system of its load to have.This requires that this optical system has extremely long focal length, namely long-focus means heavy caliber, the domestic and international research for visible ray varifocal optical system and infrared zoom optical system at present all has and relates to, but these two optical systems are designs separately, are separated, two optical systems are needed to realize required function in use, this can cause, and system bulk is excessive, weight is too heavy, can not be applicable to high altitude surveillance or scout striking type large scale computer carrying platform.In order to overcome above-mentioned defect, application number is disclose a kind of two waveband Shared aperture burnt imaging optical system of light path co-variation altogether in the Chinese patent application file of 201310248836.9, comprise public zoom group part, Amici prism, organize after visible ray and group after infrared light, wherein, public zoom group part is by the public front fixing group set gradually, public zoom group and public compensation group composition, realize visible and infrared synchronous by regulating public zoom group and public compensation group to regulate, but, because visible light optical system is not identical with the zoom ratio of infrared optical system, this just means the Observable distance in two wave band situations, observation scope is not identical, also just cause and sometimes accurately cannot follow the tracks of the consequence with measurement target.
Summary of the invention
The object of this invention is to provide a kind of visible light/infrared light two waveband optical system, accurately cannot follow the tracks of the problem with measurement target in order to solve the burnt imaging optical system of existing light path co-variation altogether.
For achieving the above object, the solution of the present invention comprises a kind of visible light/infrared light two waveband optical system, comprise beam-splitter, visible channel subsystem and infrared light passage subsystem, visible ray after described beam-splitter light splitting inputs to described visible channel subsystem, and the infrared light after described beam-splitter light splitting inputs to described infrared light passage subsystem; Described visible channel subsystem comprises that the coaxial focal power arranged successively is fixing group before positive first, focal power is negative the first zoom group, focal power to be the first negative compensating group and focal power be after positive first fixing group, light path after described first compensating group and first between fixing group is provided with the first diaphragm, is realized the zoom of this visible channel subsystem by the relative motion of the first zoom group and the first compensating group; Described first zoom group is made up of four lens, be followed successively by: the first Zoom lens, the second Zoom lens, the 3rd Zoom lens and the 4th Zoom lens, described first Zoom lens is the negative meniscus bending towards diaphragm, second Zoom lens is biconvex positive lens, 3rd Zoom lens is double-concave negative lens, 4th Zoom lens is double-concave negative lens, and described second Zoom lens and the 3rd Zoom lens form the second balsaming lens group; Described first compensating group is made up of two lens, is followed successively by: the first offset lens and the second offset lens, and described first offset lens is the falcate positive lens bending towards diaphragm, and the second offset lens is double-concave negative lens; Described infrared light passage subsystem comprises that the coaxial focal power arranged successively is fixing group before positive second, focal power is negative the second zoom group, focal power to be the second positive compensating group and focal power be after positive second fixing group, fixing light path between group and image planes is provided with the second diaphragm after described second, is realized the zoom of this infrared light passage subsystem by the relative motion of described second zoom group and the second compensating group.
Before described first, fixing group is made up of four lens, be followed successively by: fixed lens before fixed lens and the 4th before fixed lens, the 3rd before fixed lens, second before first, before described first, fixed lens is the negative meniscus bending towards described diaphragm, before second, fixed lens is biconvex positive lens, before 3rd, fixed lens is the falcate positive lens bending towards diaphragm, before 4th, fixed lens is the falcate positive lens bending towards diaphragm, and before described first, before fixed lens and second, fixed lens forms the first balsaming lens group, after described first, fixing group is made up of eight lens, successively: fixed lens after first to the 8th, after described first to the 8th, fixed lens is followed successively by the falcate positive lens bending towards diaphragm, biconvex positive lens, biconvex positive lens, double-concave negative lens, the falcate positive lens of diaphragm dorsad, the negative meniscus of diaphragm dorsad, biconvex positive lens and 3CCD equivalence prism, after 3rd, after fixed lens, the 4th, after fixed lens and the 5th, fixed lens forms the 3rd balsaming lens group, fixed lens composition the 4th balsaming lens group after fixed lens and the 7th after the 6th, before described second, fixing group is a falcate positive lens bending towards diaphragm, described second zoom group is a double-concave negative lens, described second compensating group is a biconvex positive lens, after described second, fixing group is by the 9th rear fixed lens, fixed lens after tenth, after 11, after fixed lens and the 12, fixed lens forms successively, wherein, after 9th, fixed lens is the negative meniscus bending towards diaphragm, the falcate positive lens of fixed lens diaphragm dorsad after tenth, after 11, fixed lens bends towards the negative meniscus of diaphragm, after 12, fixed lens bends towards the negative meniscus of diaphragm.
Described optical system also comprises the first catoptron and the second catoptron, incident ray is injected on described beam-splitter successively after the reflection of the first catoptron and the second catoptron, described first catoptron and the second catoptron are used for incident ray to compress, and light beam is attenuated; Described first catoptron is the parabolic mirror bending towards object space, and described second catoptron is the parabolic mirror of object space dorsad.
The technical indicator of described optical system is: wave band: visible light wave range 0.486 μm ~ 0.656 μm, infrared band 3.7 μm ~ 4.8 μm; Visible ray focal length: 690mm focuses, infrared focal length: 650mm focuses; F number: visible ray is 4.5, infrared is 4.
Described beam-splitter is the beam-splitter of visible ray, reflects infrared light, described first catoptron and the equal vertical incidence light of the second catoptron are arranged, in the described light be injected into after the reflection of the first catoptron and the second catoptron successively on beam-splitter, visible light-transmissive beam-splitter is vertically injected in visible channel subsystem, and infrared light is injected in infrared light passage subsystem after beam-splitter reflection.
Be spaced apart 150mm between described first catoptron and the second catoptron, between described second catoptron and beam-splitter, be spaced apart 40mm; Described first aperture of a mirror is 160mm, and described second aperture of a mirror is 48mm.
The technical indicator of described optical system is: wave band: visible light wave range 0.486 μm ~ 0.656 μm, infrared band 3.7 μm ~ 4.8 μm; Visible ray focal length: 10mm ~ 220mm, infrared focal length: 40mm ~ 240mm; F number: visible ray is 4.5, infrared is 4.
Described optical system also comprises the 3rd catoptron, and the infrared light after described beam-splitter light splitting is injected in described infrared light passage subsystem after the reflection of described 3rd catoptron.
In described visible channel subsystem, fixingly before first between group and the first zoom group, be spaced apart 1.5mm ~ 46.42mm, be spaced apart 0.5mm ~ 43.58mm between first zoom group and the first compensating group, after the first compensating group and first between fixing group, be spaced apart 1.5mm ~ 9.58mm, 0.15mm is spaced apart before first balsaming lens group and the 3rd between fixed lens, 0.15mm is spaced apart before 3rd before fixed lens and the 4th between fixed lens, 1.28mm is spaced apart between described first Zoom lens and the second balsaming lens group, 2.5mm is spaced apart between second balsaming lens group and the 4th Zoom lens, 1.84mm is spaced apart between first offset lens and the second offset lens, 0.15mm is spaced apart after first after fixed lens and second between fixed lens, 0.15mm is spaced apart after second between fixed lens and the 3rd balsaming lens group, 3rd balsaming lens group and the 4th glue lens charge-coupled between be spaced apart 17.76mm, in described infrared light passage subsystem, fixingly before described second between group and the second zoom group, be spaced apart 39.90mm ~ 53.47mm, be spaced apart 2.90mm ~ 45.54mm described in described second zoom group and between the second compensating group, after described second compensating group and described second between fixing group, be spaced apart 2.00mm ~ 31.00mm, 48mm is spaced apart after described 9th after fixed lens and the tenth between fixed lens, the 4th catoptron is provided with between fixed lens after fixed lens and the 11 after described tenth, fixed lens after the emergent light of fixed lens injects the 11 by described 4th catoptron after described tenth, 58mm is spaced apart after described tenth between fixed lens and described 4th catoptron, be spaced apart 20mm after described 4th catoptron and the 11 between fixed lens, after the 11 after fixed lens and the 12 between fixed lens, be spaced apart 2.46mm.
The material of each lens before described first in fixing group is followed successively by ZF52, ZK9A, ZK9A, FK61, the material of each lens in described first zoom group is followed successively by ZLaF55A, H-LaK1, ZF52, ZLaF3, the material of each lens in described first compensating group is followed successively by ZF52, ZLaF55A, and after after described first in fixing group first, after fixed lens to the 7th, the material of fixed lens is followed successively by ZK9A, QK3, H-LaK1, ZLaF55A, FK61, ZLaF3, ZF3; Before described second, the material of fixing group is SILICON, the material of described second zoom group is GMERMANIUM, the material of described second compensating group is SILICON, and the material of each lens after described second in fixing group is followed successively by GMERMANIUM, SILICON, SILICON, GMERMANIUM.
In visible light/infrared light two waveband optical system provided by the invention, total lens combination is not had between visible channel subsystem and infrared light passage subsystem, separate between two subsystems, two subsystems can be carried out correspondence separately and be regulated, avoid when using common zoom group and compensating group to focus, the system imaging occurred is clear, and the situation of another system image blur, also there will not be when again regulating, the situation that the picture element occurred is just in time contrary, so no matter this optical system still can both accurately follow the tracks of and measurement target at the wave band of infrared light at the wave band of visible ray.
And the pattern of Shared aperture common light path rear end, employing front end separate imaging, utilizes continuous vari-focus to search for target when can realize short Jiao and focal length end is followed the tracks of target, identifies and aimed at.Avoid using visible ray and infrared two discrete focal length heavy caliber systems, thus long-focus, the miniaturization of system can be realized.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of continuous zooming optical system;
Fig. 2 is the partial enlarged drawing of the a-quadrant in Fig. 1;
Fig. 3 is the one-piece construction schematic diagram focusing optical system;
Fig. 4 is the partial enlarged drawing of the a-quadrant in Fig. 3;
Transport function figure when Fig. 5 is visible light wave range f=690mm;
Point range figure when Fig. 6 is visible light wave range f=690mm;
Curvature of field when Fig. 7 is visible light wave range f=690mm, distortion figure;
Transport function figure when Fig. 8 is infrared band f=650mm;
Point range figure when Fig. 9 is infrared band f=650mm;
Curvature of field when Figure 10 is infrared band f=650mm, distortion figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Continuous zooming optical system embodiment
Optical system as shown in Figure 1, it has two kinds of wave bands, visible ray and infrared light respectively, so this optical system is divided into visible channel subsystem and infrared light passage subsystem, arrange a beam-splitter 3 in the front end of two subsystems, this beam-splitter is the beam-splitter of visible ray, reflects infrared light.Visible light-transmissive beam-splitter after this beam-splitter 3 light splitting is injected in visible channel subsystem, and infrared light is injected in infrared light passage subsystem after beam-splitter reflection.These two subsystems separately can carry out continuous vari-focus, have very large flexible adjustment.
The technical indicator of this optical system is: wave band: visible light wave range 0.486 μm ~ 0.656 μm, infrared band 3.7 μm ~ 4.8 μm; Visible ray focal length: 10mm ~ 220mm, infrared focal length: 40mm ~ 240mm; F number: visible ray is 4.5, infrared is 4.
As depicted in figs. 1 and 2, visible channel subsystem comprises that the coaxial focal power arranged successively is positive front fixing group, focal power is negative zoom group, focal power be negative compensating group and focal power is positive rear fixing group, light path between compensating group and latter fixing group is provided with iris ST, and this visible ray subsystem can realize the continuous vari-focus of this subsystem by the relative motion of zoom group and compensating group.Front fixing group is made up of four lens, be followed successively by: fixed lens before fixed lens and the 4th before fixed lens, the 3rd before fixed lens, second before first, before first, fixed lens is the negative meniscus 4 bending towards diaphragm, before second, fixed lens is biconvex positive lens 5, before 3rd, fixed lens is the falcate positive lens 6 bending towards diaphragm, before 4th, fixed lens is the falcate positive lens 7 bending towards diaphragm, and negative meniscus 4 and biconvex positive lens 5 form the first balsaming lens group.Zoom group is made up of four lens, be followed successively by: the first Zoom lens, the second Zoom lens, the 3rd Zoom lens and the 4th Zoom lens, first Zoom lens is the negative meniscus 8 bending towards diaphragm, second Zoom lens is biconvex positive lens 9,3rd Zoom lens is double-concave negative lens 10,4th Zoom lens is double-concave negative lens 11, and biconvex positive lens 9 and double-concave negative lens 10 form the second balsaming lens group.Compensating group is made up of two lens, is followed successively by: the first offset lens and the second offset lens, and the first offset lens is falcate positive lens 12, second offset lens bending towards diaphragm is double-concave negative lens 13.Rear fixing group is made up of eight lens, successively: fixed lens after first to the 8th, be followed successively by the falcate positive lens 14 bending towards diaphragm, biconvex positive lens 15, biconvex positive lens 16, double-concave negative lens 17, the falcate positive lens 18 of diaphragm dorsad, the negative meniscus 19 of diaphragm dorsad, biconvex positive lens 20 and 3CCD equivalence prism 21, the falcate positive lens 18 of biconvex positive lens 16, double-concave negative lens 17 and diaphragm dorsad forms the 3rd balsaming lens group, and the negative meniscus 19 of diaphragm and biconvex positive lens 20 form the 4th balsaming lens group dorsad.
In visible ray subsystem in the present embodiment, between front fixing group and zoom group, be spaced apart 1.5mm ~ 46.42mm, between zoom group and compensating group, be spaced apart 0.5mm ~ 43.58mm, between compensating group and latter fixing group, be spaced apart 1.5mm ~ 9.58mm.0.15mm is spaced apart between first balsaming lens group and the falcate positive lens 6 bending towards diaphragm, 0.15mm is spaced apart between falcate positive lens 6 and the falcate positive lens 7 bending towards diaphragm, bend towards and be spaced apart 1.28mm between the negative meniscus 8 of diaphragm and the second balsaming lens group, 2.5mm is spaced apart between second balsaming lens group and double-concave negative lens 11, bend towards and be spaced apart 1.84mm between the falcate positive lens 12 of diaphragm and double-concave negative lens 13, bend towards and be spaced apart 0.15mm between the falcate positive lens 14 of diaphragm and biconvex positive lens 15, 0.15mm is spaced apart between biconvex positive lens 15 and the 3rd balsaming lens group, 3rd balsaming lens group and the 4th glue lens charge-coupled between be spaced apart 17.76mm.
The material of each lens in fixing group is followed successively by ZF52, ZK9A, ZK9A, FK61, the material of each lens in zoom group is followed successively by ZLaF55A, H-LaK1, ZF52, ZLaF3, the material of each lens in compensating group is followed successively by ZF52, ZLaF55A, and after in latter fixing group first, after fixed lens to the 7th, the material of fixed lens is followed successively by ZK9A, QK3, H-LaK1, ZLaF55A, FK61, ZLaF3, ZF3.
As shown in table 1, to one of this visible ray subsystem group of design parameter, unit mm (label of sequence number difference each eyeglass corresponding in table 1,2 and 3).
Table 1
In the present embodiment, on the direction of propagation of incident ray, this beam-splitter 3 is placed with optical axis angle at 45 °, then a catoptron 22 is provided with between beam-splitter 3 and infrared light subsystem, between the optical axis of the infrared light that this catoptron 22 and beam-splitter 3 penetrate, also angle at 45 ° is placed, so, infrared light is injected in infrared light passage subsystem successively after the reflection of beam-splitter 3 and catoptron 22, and because beam-splitter 3 and catoptron 22 are all placed with corresponding optical axis angle at 45 °, so, visible ray subsystem and infrared light subsystem are finally in a parallel set, introduce catoptron folded optical path, the length of whole system can be shortened.
This infrared light passage subsystem comprises that the coaxial focal power arranged successively is positive front fixing group, focal power is negative zoom group, focal power be positive compensating group and focal power is positive rear fixing group, rear fixing light path between group and image planes is provided with diaphragm, this diaphragm overlaps with the cold stop of infrared eye, can realize 100% cold stop efficiency.This infrared light subsystem can realize the continuous vari-focus of this subsystem by the relative motion of zoom group and compensating group.Front fixing group is a falcate positive lens 23 bending towards diaphragm, zoom group is a double-concave negative lens 24, compensating group is a biconvex positive lens 25, rear fixing group is by the 9th rear fixed lens, fixed lens after tenth, after 11, after fixed lens and the 12, fixed lens forms successively, wherein, after 9th, fixed lens is the negative meniscus 26 bending towards diaphragm, the falcate positive lens 27 of fixed lens diaphragm dorsad after tenth, after 11, fixed lens bends towards the negative meniscus 29 of diaphragm, after 12, fixed lens bends towards the negative meniscus 30 of diaphragm.
In infrared light passage subsystem in the present embodiment, before fixing between group and zoom group, be spaced apart 39.90mm ~ 53.47mm, be spaced apart 2.90mm ~ 45.54mm between zoom group and compensating group, between compensating group and latter fixing group, be spaced apart 2.00mm ~ 31.00mm.
Be provided with catoptron 28 between the falcate positive lens 27 of diaphragm and the negative meniscus 29 bending towards diaphragm dorsad, the emergent light of falcate positive lens 27 injects negative meniscus 29 by catoptron 28.Wherein, bend towards and be spaced apart 48mm between the negative meniscus 26 of diaphragm and the falcate positive lens 27 of diaphragm dorsad, 58mm is spaced apart dorsad between the falcate positive lens 27 of diaphragm and catoptron 28, be spaced apart 20mm between catoptron 28 and negative meniscus 29, between negative meniscus 29 and negative meniscus 30, be spaced apart 2.46mm.
The material bending towards the falcate positive lens 23 of diaphragm is SILICON, the material of double-concave negative lens 24 is GMERMANIUM, the material of biconvex positive lens 25 is SILICON, and the material of each lens in latter fixing group is followed successively by GMERMANIUM, SILICON, SILICON, GMERMANIUM.
As shown in table 2, provide one group of design parameter of this infrared light subsystem, unit mm.
Table 2
The rear surface of double-concave negative lens 24, the front surface bending towards the negative meniscus 26 of diaphragm, the rear surface of negative meniscus 30 that bends towards diaphragm adopt aspheric surface, and aspheric surface adopts the Asphere face type in CODEV software, and equation is:
Wherein, c is curvature, and r is the axial radial coordinate of vertical light, and k is conic constant, and A is quadravalence asphericity coefficient, B six rank asphericity coefficient, C are eight rank asphericity coefficients, D is ten rank asphericity coefficients.
Below provide one group of above-mentioned several aspheric asphericity coefficient.
The asphericity coefficient of the rear surface of lens 24 is: k=1.1134; A=2.6965E-7; B=-4.0543E-10; C=-1.3258E-13.
The front surface asphericity coefficient of lens 26 is: k=-0.95; A=7.21676E-7; B=-3.9905E-10; C=7.1085E-13.
The rear surface asphericity coefficient of lens 30 is: k=5.95; A=5.1092E-8; B=3.5079E-8; C=-1.3455E-10.
Focus optical system embodiment
In above-mentioned continuous zooming optical system, visible ray subsystem and infrared light subsystem are all in continuous vari-focus state.When visible ray subsystem be in focal length 220mm, infrared subsystem be in focal length 240mm time by two catoptrons incision light paths, now, visible light wave range and infrared band are all in focal length and focus state.
So this technical indicator focusing optical system is: wave band: visible light wave range 0.486 μm ~ 0.656 μm, infrared band 3.7 μm ~ 4.8 μm; Visible ray focal length: 690mm focuses, infrared focal length: 650mm focuses; F number: visible ray is 4.5, infrared is 4.
Be specially:
On the basis of above-mentioned continuous zooming optical system, two catoptrons are also set in this optical system, catoptron 1 and catoptron 2, as shown in Figures 3 and 4, incident ray is injected on beam-splitter 3 successively after the reflection of catoptron 1 and catoptron 2, the effect of these two catoptrons is compressed by incident ray, and light beam is attenuated, and the bore of such back lens just can diminish.
In the present embodiment, catoptron 1 is for bending towards the parabolic mirror of object space, and catoptron 2 is the parabolic mirror of object space dorsad, and catoptron 1 and catoptron 2 all vertical incidence light are arranged, and the base material of these two catoptrons is quartz material, reflecting surface plating highly reflecting films.
Be spaced apart 150mm between catoptron 1 and catoptron 2, be spaced apart 40mm between catoptron 2 and beam-splitter 3, and the bore of catoptron 1 is 160mm, the bore of catoptron 2 is 48mm.
As shown in table 3, be one group of design parameter of catoptron 1, catoptron 2 and beam-splitter 3, unit mm.
Table 3
| Sequence number | Face type | Radius-of-curvature | Interval | Material |
| 1 | Parabola | 440.63 | 150 | Quartz |
| 2 | Parabola | 140.63 | 40 | Quartz |
| 3 | Plane | Infinity | 40 | Quartz |
In above-mentioned continuous zooming optical system, do not arrange catoptron 1 and catoptron 2, as other embodiment, catoptron 1 and catoptron 2 are just arranged in this continuous vari-focus system in advance, and wherein, catoptron 2 can be cut and cut out from light path.The incision of catoptron 2 and cut out to have been come by physical construction, can use a driven by motor catoptron 2 to move its position, use motor to carry out moving belonging to routine techniques, no longer repeat here.
When catoptron 2 cuts out from light path, the light reflected by catoptron 1 can not enter rear end subsystem and carry out imaging, now, catoptron 1 and catoptron 2 inoperative in the optical path, all do not participate in the imaging of optical system, also can think that these two catoptrons do not exist, now visible ray and infrared band are in continuous vari-focus state.
When visible ray subsystem be in minimum visual field and focal length 220mm, infrared subsystem be in minimum visual field and focal length 240mm time, zoom group in both and compensating group have been moved to designed extreme position, now, catoptron 2 is cut in light path, then catoptron 1 and catoptron 2 participate in imaging simultaneously, and visible light wave range and infrared band are all in focal length and focus state.The light that principal reflection mirror 1 reflects enters secondary mirror 2, the light that secondary mirror 2 reflects enters visible ray subsystem that focal length is 220mm and focal length is in the infrared subsystem of 240mm, in this case, the focal length of the refractive and reflective optical system that the refraction type visible ray subsystem that principal reflection mirror 1, secondary mirror 2 are 220mm with focal length forms is 690mm; The focal length of the refractive and reflective optical system that the infrared subsystem of refraction type that principal reflection mirror 1, secondary mirror 2 are 240mm with focal length forms is 650mm.
Be illustrated in figure 5 transport function figure during visible light wave range f=690mm; Point range figure when Fig. 6 is visible light wave range f=690mm; Curvature of field when Fig. 7 is visible light wave range f=690mm, distortion figure; Transport function figure when Fig. 8 is infrared band f=650mm; Point range figure when Fig. 9 is infrared band f=650mm; Curvature of field when Figure 10 is infrared band f=650mm, distortion figure.
Be presented above concrete embodiment, but the present invention is not limited to described embodiment.Basic ideas of the present invention are the basic technical indicator of above-mentioned optical system, on the basis meeting technical indicator, the parameter of each lens in this optical system is not unique, this embodiment just provides wherein a kind of design parameter, for those of ordinary skill in the art, according to basic ideas of the present invention, designing the model of various distortion, parameter does not need to spend creative work.The change carried out embodiment without departing from the principles and spirit of the present invention, amendment, replacement and modification still fall within the scope of protection of the present invention.
Claims (10)
1. a visible light/infrared light two waveband optical system, it is characterized in that, comprise beam-splitter, visible channel subsystem and infrared light passage subsystem, visible ray after described beam-splitter light splitting inputs to described visible channel subsystem, and the infrared light after described beam-splitter light splitting inputs to described infrared light passage subsystem;
Described visible channel subsystem comprises that the coaxial focal power arranged successively is fixing group before positive first, focal power is negative the first zoom group, focal power to be the first negative compensating group and focal power be after positive first fixing group, light path after described first compensating group and first between fixing group is provided with the first diaphragm, is realized the zoom of this visible channel subsystem by the relative motion of the first zoom group and the first compensating group; Described first zoom group is made up of four lens, be followed successively by: the first Zoom lens, the second Zoom lens, the 3rd Zoom lens and the 4th Zoom lens, described first Zoom lens is the negative meniscus bending towards diaphragm, second Zoom lens is biconvex positive lens, 3rd Zoom lens is double-concave negative lens, 4th Zoom lens is double-concave negative lens, and described second Zoom lens and the 3rd Zoom lens form the second balsaming lens group; Described first compensating group is made up of two lens, is followed successively by: the first offset lens and the second offset lens, and described first offset lens is the falcate positive lens bending towards diaphragm, and the second offset lens is double-concave negative lens;
Described infrared light passage subsystem comprises that the coaxial focal power arranged successively is fixing group before positive second, focal power is negative the second zoom group, focal power to be the second positive compensating group and focal power be after positive second fixing group, fixing light path between group and image planes is provided with the second diaphragm after described second, is realized the zoom of this infrared light passage subsystem by the relative motion of described second zoom group and the second compensating group.
2. visible light/infrared light two waveband optical system according to claim 1, it is characterized in that, before described first, fixing group is made up of four lens, be followed successively by: fixed lens before first, fixed lens before second, fixed lens before fixed lens and the 4th before 3rd, before described first, fixed lens is the negative meniscus bending towards described diaphragm, before second, fixed lens is biconvex positive lens, before 3rd, fixed lens is the falcate positive lens bending towards diaphragm, before 4th, fixed lens is the falcate positive lens bending towards diaphragm, before described first, before fixed lens and second, fixed lens forms the first balsaming lens group, after described first, fixing group is made up of eight lens, successively: fixed lens after first to the 8th, after described first to the 8th, fixed lens is followed successively by the falcate positive lens bending towards diaphragm, biconvex positive lens, biconvex positive lens, double-concave negative lens, the falcate positive lens of diaphragm dorsad, the negative meniscus of diaphragm dorsad, biconvex positive lens and 3CCD equivalence prism, after 3rd, after fixed lens, the 4th, after fixed lens and the 5th, fixed lens forms the 3rd balsaming lens group, fixed lens composition the 4th balsaming lens group after fixed lens and the 7th after the 6th,
Before described second, fixing group is a falcate positive lens bending towards diaphragm, described second zoom group is a double-concave negative lens, described second compensating group is a biconvex positive lens, after described second, fixing group is by the 9th rear fixed lens, fixed lens after tenth, after 11, after fixed lens and the 12, fixed lens forms successively, wherein, after 9th, fixed lens is the negative meniscus bending towards diaphragm, the falcate positive lens of fixed lens diaphragm dorsad after tenth, after 11, fixed lens bends towards the negative meniscus of diaphragm, after 12, fixed lens bends towards the negative meniscus of diaphragm.
3. visible light/infrared light two waveband optical system according to claim 2, it is characterized in that, described optical system also comprises the first catoptron and the second catoptron, incident ray is injected on described beam-splitter successively after the reflection of the first catoptron and the second catoptron, described first catoptron and the second catoptron are used for incident ray to compress, and light beam is attenuated; Described first catoptron is the parabolic mirror bending towards object space, and described second catoptron is the parabolic mirror of object space dorsad.
4. visible light/infrared light two waveband optical system according to claim 3, is characterized in that, the technical indicator of described optical system is: wave band: visible light wave range 0.486 μm ~ 0.656 μm, infrared band 3.7 μm ~ 4.8 μm; Visible ray focal length: 690mm focuses, infrared focal length: 650mm focuses; F number: visible ray is 4.5, infrared is 4.
5. visible light/infrared light two waveband optical system according to claim 4, it is characterized in that, described beam-splitter is the beam-splitter of visible ray, reflects infrared light, described first catoptron and the equal vertical incidence light of the second catoptron are arranged, in the described light be injected into after the reflection of the first catoptron and the second catoptron successively on beam-splitter, visible light-transmissive beam-splitter is vertically injected in visible channel subsystem, and infrared light is injected in infrared light passage subsystem after beam-splitter reflection.
6. visible light/infrared light two waveband optical system according to claim 5, is characterized in that, is spaced apart 150mm between described first catoptron and the second catoptron, is spaced apart 40mm between described second catoptron and beam-splitter; Described first aperture of a mirror is 160mm, and described second aperture of a mirror is 48mm.
7. visible light/infrared light two waveband optical system according to claim 2, is characterized in that, the technical indicator of described optical system is: wave band: visible light wave range 0.486 μm ~ 0.656 μm, infrared band 3.7 μm ~ 4.8 μm; Visible ray focal length: 10mm ~ 220mm, infrared focal length: 40mm ~ 240mm; F number: visible ray is 4.5, infrared is 4.
8. the visible light/infrared light two waveband optical system according to claim 4 or 7, it is characterized in that, described optical system also comprises the 3rd catoptron, and the infrared light after described beam-splitter light splitting is injected in described infrared light passage subsystem after the reflection of described 3rd catoptron.
9. visible light/infrared light two waveband optical system according to claim 8, it is characterized in that, in described visible channel subsystem, fixingly before first between group and the first zoom group, be spaced apart 1.5mm ~ 46.42mm, be spaced apart 0.5mm ~ 43.58mm between first zoom group and the first compensating group, after the first compensating group and first between fixing group, be spaced apart 1.5mm ~ 9.58mm, 0.15mm is spaced apart before first balsaming lens group and the 3rd between fixed lens, 0.15mm is spaced apart before 3rd before fixed lens and the 4th between fixed lens, 1.28mm is spaced apart between described first Zoom lens and the second balsaming lens group, 2.5mm is spaced apart between second balsaming lens group and the 4th Zoom lens, 1.84mm is spaced apart between first offset lens and the second offset lens, 0.15mm is spaced apart after first after fixed lens and second between fixed lens, 0.15mm is spaced apart after second between fixed lens and the 3rd balsaming lens group, 3rd balsaming lens group and the 4th glue lens charge-coupled between be spaced apart 17.76mm,
In described infrared light passage subsystem, fixingly before described second between group and the second zoom group, be spaced apart 39.90mm ~ 53.47mm, be spaced apart 2.90mm ~ 45.54mm described in described second zoom group and between the second compensating group, after described second compensating group and described second between fixing group, be spaced apart 2.00mm ~ 31.00mm; 48mm is spaced apart after described 9th after fixed lens and the tenth between fixed lens, the 4th catoptron is provided with between fixed lens after fixed lens and the 11 after described tenth, fixed lens after the emergent light of fixed lens injects the 11 by described 4th catoptron after described tenth, 58mm is spaced apart after described tenth between fixed lens and described 4th catoptron, be spaced apart 20mm after described 4th catoptron and the 11 between fixed lens, after the 11 after fixed lens and the 12 between fixed lens, be spaced apart 2.46mm.
10. visible light/infrared light two waveband optical system according to claim 9, it is characterized in that, the material of each lens before described first in fixing group is followed successively by ZF52, ZK9A, ZK9A, FK61, the material of each lens in described first zoom group is followed successively by ZLaF55A, H-LaK1, ZF52, ZLaF3, the material of each lens in described first compensating group is followed successively by ZF52, ZLaF55A, after after described first in fixing group first, after fixed lens to the 7th, the material of fixed lens is followed successively by ZK9A, QK3, H-LaK1, ZLaF55A, FK61, ZLaF3, ZF3, before described second, the material of fixing group is SILICON, the material of described second zoom group is GMERMANIUM, the material of described second compensating group is SILICON, and the material of each lens after described second in fixing group is followed successively by GMERMANIUM, SILICON, SILICON, GMERMANIUM.
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