CN208013531U - Shared aperture double-view field Dual band IR imaging lens - Google Patents
Shared aperture double-view field Dual band IR imaging lens Download PDFInfo
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- CN208013531U CN208013531U CN201820401679.9U CN201820401679U CN208013531U CN 208013531 U CN208013531 U CN 208013531U CN 201820401679 U CN201820401679 U CN 201820401679U CN 208013531 U CN208013531 U CN 208013531U
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Abstract
The utility model is related to a kind of Shared aperture double-view field Dual band IR imaging lens, including lens barrel, and the protection window in lens barrel front end is arranged；Incident ray is incident to from protection window in lens barrel, is first passed through the prism that is split after fixing group before Shared aperture and is divided into the LONG WAVE INFRARED light of transmission and the medium-wave infrared light of reflection；Group, Long Wave Infrared Probe are fixed after setting gradually long wave center fixation group, long wave zoom microscope group, long wave along the direction of LONG WAVE INFRARED light；Medium-wave infrared light first passes through group is fixed before medium wave after reflected by plane mirror after pass through and fix group after medium wave and received by medium-wave infrared detector.The camera lens has big visual field, and small volume structure is compact, and Zoom structure is simple, and can realize that LONG WAVE INFRARED zoom system, pancreatic system is designed with medium-wave infrared fixed-focus system Shared aperture, realizes the imaging passive athermal of lens optical.
Description
Technical field
The utility model belongs to infrared thermal imaging field, and in particular to a kind of Shared aperture double-view field Dual band IR imaging lens
Head.
Background technology
Double vision field optical system has two imaging viewing fields of different sizes, and big visual field can increase spatial perception range, small
Visual field can observe interested scene in detail.Dual band IR optical system can obtain the long wave and medium wave of target simultaneously
The characteristic information of two different-wavebands improves the observation sensing capability of system.Shared aperture Dual band IR imaging lens use long wave
The design method of infrared optical system and medium-wave infrared optical system compatible front-end light path makes the optical system of two wave bands share
The same optical axis, can be in the case where detected target be in rotary motion state or measurement camera is in rotary motion state
Obtain good observation effect.
Generally shorter applied to the imaging lens focal length in machine vision, field angle is larger, and spectroscope is in optical system
The space occupied is larger so that long, medium wave optical system realizes that Shared aperture design difficulty is larger, if zoom is added all the way wherein
Light path simultaneously makes optical system realize PASSIVE OPTICAL athermal within the scope of larger temperature, then design difficulty is further promoted.
Utility model content
In order to solve the problems, such as background technology, the utility model, which provides one kind, having big visual field, and small volume structure is compact,
Zoom structure is simple, can realize the imaging lens of LONG WAVE INFRARED zoom system, pancreatic system and the design of medium-wave infrared fixed-focus system Shared aperture,
Realize the imaging passive athermal of lens optical.
The basic introduction of technical solutions of the utility model：
The imaging lens of the utility model are suitable for long wave infrared region (7.7~10.3 μm) and medium-wave infrared wave band (3.7
~4.8 μm).
The utility model being particular in that compared with the prior art：Spectrum is carried out using Amici prism and realizes length
Wave is infrared and the design of medium-wave infrared Shared aperture, wherein LONG WAVE INFRARED realize the design of double-view field zoom；
The specific technical solution of the utility model is：
The utility model provides a kind of Shared aperture double-view field Dual band IR imaging lens, including lens barrel, is arranged in lens barrel
Group, Amici prism, long wave center fixation group, long wave zoom are fixed before the protection window of front end and the Shared aperture being arranged in lens barrel
It is fixed after microscope group, long wave before group, Long Wave Infrared Probe, medium wave after fixing group, plane mirror, medium wave and fixes group and medium wave
Infrared detector；
Incident ray is incident to from protection window in lens barrel, incident ray first passes through group is fixed before Shared aperture after be split prism
It is divided into the LONG WAVE INFRARED light of transmission and the medium-wave infrared light of reflection；
Set gradually along the direction of LONG WAVE INFRARED light fix after long wave center fixation group, long wave zoom microscope group, long wave group,
Long Wave Infrared Probe；
Medium-wave infrared light first passes through group is fixed before medium wave after reflected by plane mirror after pass through medium wave after fix group by
Wave infrared detector receives.
Further, it is 4 lens by being stacked successively along incident ray transmission direction that group is fixed before above-mentioned Shared aperture
Composition, and 0.02<The focal power Jue Duizhi < of fixed group before Shared aperture;0.03, wherein 4 lens are along incident ray transmission direction
It is made successively of IRG205, Ge, ZnS and IRG205 material.
Further, above-mentioned Amici prism selects ZnS materials to be made.
Further, above-mentioned long wave center fixation group is saturating by 2 stacked successively along the direction of LONG WAVE INFRARED optical transport
Microscope group is at 0.006<Long wave center fixation group focal power Jue Duizhi <0.008, and 2 lens use successively along light transmission direction
ZnS and IRG205 materials are made, and 2 lens apex are smaller than 3mm.
Further, above-mentioned long wave zoom microscope group along the direction of LONG WAVE INFRARED optical transport by 2 lens stacking successively
Composition, 0.02<Long wave zoom microscope group focal power Jue Duizhi <0.03, and 2 lens along light transmission direction successively use Ge and
IRG205 materials are made.
Further, fixed group is monolithic positive lens, material IRG205,0.04< after above-mentioned long wave;Group is fixed after long wave
Focal power Jue Duizhi <0.05.
Further, wavefront fixation group is monolithic positive lens among the above, and material is germanium, 0.005<Fixed group light focus before medium wave
Spend Jue Duizhi <0.006.
Further, it is saturating by 3 lists stacked successively along the direction of medium-wave infrared optical transport that group is fixed after above-mentioned medium wave
Microscope group is at 0.03<Fixed group focal power Jue Duizhi < after medium wave;0.04, and 3 simple lenses use successively along light transmission direction
Ge, IRG205 and Si material are made.
Further, above-mentioned protection window is made of multispectral ZnS materials.
Further, above-mentioned Long Wave Infrared Probe and medium-wave infrared detector are all made of no thermalized design, meet-
40 ° of extremely+60 ° of operating temperatures.
LONG WAVE INFRARED optical system realizes the switching of small/big visual field by cutting/cutting out zoom group 5 in the utility model,
It disclosure satisfy that the requirement that visual field is switched fast, reduce target losing probability.When switching zoom group, light fixed group convergence after passing through
In on focal plane, and keep focal plane position constant.Medium-wave infrared optical system uses fixed-focus form, visual field and LONG WAVE INFRARED
Big visual field is identical, and long wave is worked at the same time with medium-wave infrared optical system, the information of available target different-waveband, and can realize
Wave systems stay is observed, the operating mode that long wave system is observed in detail；
The utility model has the advantages that：
1, the utility model camera lens realizes LONG WAVE INFRARED and the double-colored design of the double-colored Shared aperture of medium-wave infrared, two wave band systems
Altogether imaging shaft is convenient for the matching of two tone image.
2, the utility model detector can meet -40 DEG C~60 DEG C of wide operating temperature without thermalized design, in the temperature model
Focusing is not had in enclosing.
3, the imaging lens of the utility model can match F/2 refrigeration mode detectors, have stronger energy harvesting capabilities, can
To greatly improve imaging signal-to-noise ratio.
4, the long wave double-view field of the utility model uses long wave zoom microscope group suitching type zoom form, zoom rate fast.
5, the utility model volume (protection window vertex to image planes position) 285mm × 116mm × 50mm, it is compact-sized；
6, using Amici prism, portion is divided LONG WAVE INFRARED and medium-wave infrared to the utility model in the optical path, avoids inclining
Tiltedly light splitting tablet introduces asymmetric aberration in the optical path, reduces design difficulty.
7, it is 236 × 10 that the utility model, which uses most common coefficient of thermal expansion,-7The common aluminum alloy lens barrel of/K, can protect
Card is within the temperature range of -40 DEG C~60 DEG C, and at spatial frequency 33lp/mm, two focal lengths of LONG WAVE INFRARED optical system are all
The optical transfer function MTF of visual field is more than 0.15, and medium-wave infrared optical system optical transfer function MTF is more than 0.5, solves existing
There is the problem of Shared aperture optical system needs focusing to make imaging clearly at different temperatures.
Description of the drawings
Fig. 1 the utility model LONG WAVE INFRARED zoom microscope groups cut the structural schematic diagram in light path.
Fig. 2 the utility model LONG WAVE INFRARED zoom microscope groups cut out the structural schematic diagram in light path.
LONG WAVE INFRARED small field of view optical transfer function figure under Fig. 3 the utility model room temperature operating modes.
LONG WAVE INFRARED small field of view optical transfer function figure under -40 DEG C of operating modes of Fig. 4 the utility model.
LONG WAVE INFRARED small field of view optical transfer function figure under 60 DEG C of operating modes of Fig. 5 the utility model.
The big visual field optical transfer function figure of LONG WAVE INFRARED under Fig. 6 the utility model room temperature operating modes.
The big visual field optical transfer function figure of LONG WAVE INFRARED under -40 DEG C of operating modes of Fig. 7 the utility model.
The big visual field optical transfer function figure of LONG WAVE INFRARED under 60 DEG C of operating modes of Fig. 8 the utility model.
Medium-wave infrared optical transfer function figure under Fig. 9 the utility model room temperature operating modes.
Medium-wave infrared optical transfer function figure under -40 DEG C of operating modes of Figure 10 the utility model.
Medium-wave infrared optical transfer function figure under 60 DEG C of operating modes of Figure 11 the utility model.
Reference numeral is as follows：
Group, 4- Amici prisms, 5- long waves center fixation group, 6- long waves are fixed before 1- lens barrels, 2- protections window, 3- Shared apertures to become
It is fixed after times microscope group, 7- long waves before group, 8- Long Wave Infrared Probes, 9- medium waves after fixing group, 10- plane mirrors, 11- medium waves
Fixed group, 12- medium-wave infrared detectors.
Specific implementation mode
The characteristics of in order to further fairly set out the technical program, provides the utility model tool below in conjunction with the accompanying drawings
The preferred forms of body embodiment, illustrate the utility model, but should not be construed to new to this practicality
The restriction of type.
Refering to fig. 1, Fig. 2.Shared aperture imaging lens include lens barrel 1, protection window 2 and the optical system being arranged in lens barrel
System, wherein protection window 2 be arranged optical system in 1 front end of lens barrel, lens barrel 1 include fixed group 3 before Shared aperture, Amici prism 4,
Group 9 is fixed before fixed group 7, Long Wave Infrared Probe 8, medium wave, put down after long wave center fixation group 5, long wave zoom microscope group 6, long wave
Fixed group 11 and medium-wave infrared detector 12 after face speculum 10, medium wave；
Incident ray is incident to from protection window 2 in lens barrel 1, and incident ray is first passed through and is split after fixed group 3 before Shared aperture
Prism 4 is divided into the LONG WAVE INFRARED light of transmission and the medium-wave infrared light of reflection；
It is fixed after setting gradually long wave center fixation group 5, long wave zoom microscope group 6, long wave along the direction of LONG WAVE INFRARED light
Group 7, Long Wave Infrared Probe 8；By the incision of long wave zoom microscope group/cut out and realize that small/big visual field of LONG WAVE INFRARED light path becomes
Change, remaining each group position immobilizes.Optical system overall length is constant when switchable optics system visual field.
Medium-wave infrared light first passes through reflected by plane mirror 10 after fixed group 9 before medium wave after pass through fixed group 11 after medium wave
It is received by medium-wave infrared detector 12, wherein plane mirror 10 makes that optical system is small, structure is tight for folding light path
It gathers.
Using the form of Shared aperture light splitting in the present embodiment, realized using Long Wave Infrared Probe, medium-wave infrared detector
Double-colored light path design.Wherein, Long Wave Infrared Probe parameter is：7.7~10.3 μm of wave band, 640 × 512 resolution ratio, pixel ruler
Very little 15 μm, F numbers are 2.Medium-wave infrared parameter detector is 3.7~4.8 μm, 640 × 512 resolution ratio, 15 μm of pixel dimension, F numbers
It is 2.
To realize the athermal and aberration of optical system, each parameter should meet condition in system：
In formulaFor every piece of power of lens,For optical system focal power, viFor the abbe number of every piece of lens,For lens material focal length variations, a caused by refractive index/temperature coefficient dn/dtLFor the coefficient of thermal expansion of lens barrel material, L
For optical tube length.
To realize Shared aperture design and athermal, aberration, protection window material select long, medium wave band chromatic aberration coefficient difference compared with
Greatly, the good ZnS materials of transmitance higher mechanical strength, and it is smaller to the absorption coefficient of infrared energy, increases the transmission of system
Rate.
Wherein, before Shared aperture fixed group 3 be by stacked successively along incident ray transmission direction 4 lens (such as Fig. 1 and
Shown in Fig. 2, the labels of 4 lens is 301 respectively, 302,303,304) form, and 0.02<The focal power of fixed group before Shared aperture
Jue Duizhi <0.03,4 lens is made of IRG205, Ge, ZnS and IRG205 material successively along incident ray transmission direction,
Wherein aberration in aberration and respective wave band is individually eliminated between heat differential, two wave bands using tri- kinds of materials of Ge, ZnS and IRG205.
To realize Shared aperture design and athermal, aberration, 4 material selection of Amici prism length, medium wave band chromatic aberration coefficient difference
Larger ZnS materials, and it is smaller to the absorption coefficient of infrared energy, increases the transmitance of system.
For athermal and aberration, long wave center fixation group 5 is along the direction of LONG WAVE INFRARED optical transport by stack successively 2
(as depicted in figs. 1 and 2, the label of 2 lens is 501 respectively, 502) forms, 0.006< lens;Long wave center fixation group light focus
Spend Jue Duizhi <0.008, wherein 2 lens are made of ZnS and IRG205 materials successively along LONG WAVE INFRARED optical transmission direction, 2
Piece lens apex is smaller than 3mm.
For athermal and aberration, long wave zoom microscope group 6 along the direction of LONG WAVE INFRARED optical transport by stack successively 2 thoroughly
Microscope group is at 0.02<Long wave zoom microscope group focal power Jue Duizhi <0.03, wherein 2 lens along LONG WAVE INFRARED optical transmission direction according to
It is secondary to be made of Ge and IRG205 materials.In order to which motionless, two lens are stablized in the switching and position of focal plane of realizing optical system field of view
Between interval be less than 11mm, interval when small field of view between center fixation group 5 and long wave zoom microscope group 6 is less than 26mm.
For athermal and aberration and stablize position of focal plane, fixed group 7 is monolithic positive lens after long wave, material IRG205,
0.04<Fixed group focal power Jue Duizhi < after long wave;0.05.It is more than 7mm with the interval of long wave zoom microscope group 6 when small field of view, regards greatly
It is more than 65mm with the interval of long wave center fixation group 4 when field.
For athermal and aberration, fixed group 9 is monolithic positive lens before the medium wave, and material is germanium, 0.005<It is solid before medium wave
Surely group focal power Jue Duizhi <It is separated axially by more than 50mm between fixed group 11 behind 0.006, with medium wave, in having enough
After wave fixed group 11 for 3 simple lenses (as depicted in figs. 1 and 2, the label of 4 lens be 1101 respectively, 1102,1103) group
At 0.03<Focal power Jue Duizhi <0.04, wherein 3 simple lenses along medium-wave infrared optical transmission direction successively use Ge,
IRG205 and Si materials are made, and are inserted into plane mirror 10 and carry out light path folding, reduce system bulk.
In the present embodiment, the preferred common aluminum alloy of 1 material of lens barrel is without other special materials, at -40 DEG C to 60 DEG C
It is interior that there is preferable image quality.In order to obtain more excellent design result, other coefficient of thermal expansion preferably material may be used.
Include 7 aspherical in order to improve the image quality of optical system, in the present embodiment, and diffraction surfaces are not used.
In the present embodiment, LONG WAVE INFRARED realizes the infrared imaging camera lens of Shared aperture with medium-wave infrared, and can realize optics
Passive athermal, temperature applicable range are -40 DEG C to+60 DEG C, and lens barrel uses coefficient of thermal expansion for 236 × 10-7The aluminium alloy of/k
Material.It is respectively the long and short burnt and medium-wave infrared of camera lens LONG WAVE INFRARED in -40 DEG C, 60 DEG C and room temperature as shown in Fig. 3 to Figure 11
The optical transfer function of band system realizes passive athermal design close to diffraction limit.The imaging lens of the utility model
Suitable for long wave infrared region (7.7~10.3 μm) and medium-wave infrared wave band (3.7~4.8 μm)；
LONG WAVE INFRARED optical system F numbers are 2, and maximum caliber is less than 50mm, focal length 22/55mm, and zoom ratio is 2.5 times,
Belong to and cut/cut out formula zoom, the front and back optical system overall length of visual field switching is constant；Medium-wave infrared optical system F numbers are 2, maximum
Bore is less than 50mm, focal length 22mm.
Description of the embodiment utilized above to the utility model, intention is exemplary, not to the guarantor of the utility model
Shield range provides constraints.Therefore, it is apparent to those skilled in the art, is not departing from what the utility model was proposed
In the condition of right, feature replacement or modification can be carried out to described the utility model.
Claims (10)
1. a kind of Shared aperture double-view field Dual band IR imaging lens, including lens barrel, it is characterised in that：
Further include being arranged to fix group, Amici prism, length before the protection window and the Shared aperture that is arranged in lens barrel of lens barrel front end
Group, plane reflection are fixed before fixing group, Long Wave Infrared Probe, medium wave after wave center fixation group, long wave zoom microscope group, long wave
Group and medium-wave infrared detector are fixed after mirror, medium wave；
Incident ray is incident to from protection window in lens barrel, incident ray first passes through group is fixed before Shared aperture after the prism that is split be divided into
The LONG WAVE INFRARED light of transmission and the medium-wave infrared light of reflection；
Group, long wave are fixed after setting gradually long wave center fixation group, long wave zoom microscope group, long wave along the direction of LONG WAVE INFRARED light
Infrared detector；
Medium-wave infrared light first passes through group is fixed before medium wave after reflected by plane mirror after pass through that fix group after medium wave red by medium wave
External detector receives.
2. Shared aperture double-view field Dual band IR imaging lens according to claim 1, it is characterised in that：
It fixes group before the Shared aperture to be made of 4 lens stacked successively along incident ray transmission direction, and 0.02<Altogether
The focal power Jue Duizhi < of fixed group before bore;0.03, wherein 4 lens use successively along incident ray transmission direction
IRG205, Ge, ZnS and IRG205 material are made.
3. Shared aperture double-view field Dual band IR imaging lens according to claim 1 or 2, it is characterised in that：Amici prism
ZnS materials are selected to be made.
4. Shared aperture double-view field Dual band IR imaging lens according to claim 3, it is characterised in that：
Fixation group in long wave center is made of along the direction of LONG WAVE INFRARED optical transport 2 lens stacked successively, 0.006<Long wave
The fixed group focal power Jue Duizhi < in center;0.008, and 2 lens use ZnS and IRG205 material systems successively along light transmission direction
At 2 lens apex are smaller than 3mm.
5. Shared aperture double-view field Dual band IR imaging lens according to claim 4, it is characterised in that：Long wave zoom microscope group
It is made of 2 lens stacked successively along the direction of LONG WAVE INFRARED optical transport, 0.02<Long wave zoom microscope group focal power absolute value
<0.03, and 2 lens are made of Ge and IRG205 materials successively along light transmission direction.
6. Shared aperture double-view field Dual band IR imaging lens according to claim 5, it is characterised in that：Group is fixed after long wave
For monolithic positive lens, material IRG205,0.04<Fixed group focal power Jue Duizhi < after long wave;0.05.
7. Shared aperture double-view field Dual band IR imaging lens according to claim 6, it is characterised in that：Group is fixed before medium wave
For monolithic positive lens, material is germanium, 0.005<Fixed group focal power Jue Duizhi < before medium wave;0.006.
8. Shared aperture double-view field Dual band IR imaging lens according to claim 7, it is characterised in that：Group is fixed after medium wave
It is made of 3 simple lenses stacked successively along the direction of medium-wave infrared optical transport, 0.03<Fixed group focal power is absolute after medium wave
Value <0.04, and 3 simple lenses are made of Ge, IRG205 and Si material successively along light transmission direction.
9. Shared aperture double-view field Dual band IR imaging lens according to claim 8, it is characterised in that：The protection window is adopted
It is made of multispectral ZnS materials.
10. Shared aperture double-view field Dual band IR imaging lens according to claim 9, it is characterised in that：The long wave is red
External detector and medium-wave infrared detector are all made of no thermalized design, meet -40 ° to+60 ° operating temperatures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820401679.9U CN208013531U (en) | 2018-03-23 | 2018-03-23 | Shared aperture double-view field Dual band IR imaging lens |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820401679.9U CN208013531U (en) | 2018-03-23 | 2018-03-23 | Shared aperture double-view field Dual band IR imaging lens |
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| CN208013531U true CN208013531U (en) | 2018-10-26 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345093A (en) * | 2018-03-23 | 2018-07-31 | 中国科学院西安光学精密机械研究所 | Shared aperture double-view field Dual band IR imaging lens |
| CN112180571A (en) * | 2020-09-30 | 2021-01-05 | 中国科学院西安光学精密机械研究所 | Common-aperture infrared dual-waveband dual-field-of-view optical system |
| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
-
2018
- 2018-03-23 CN CN201820401679.9U patent/CN208013531U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108345093A (en) * | 2018-03-23 | 2018-07-31 | 中国科学院西安光学精密机械研究所 | Shared aperture double-view field Dual band IR imaging lens |
| CN112180571A (en) * | 2020-09-30 | 2021-01-05 | 中国科学院西安光学精密机械研究所 | Common-aperture infrared dual-waveband dual-field-of-view optical system |
| CN112180571B (en) * | 2020-09-30 | 2021-08-17 | 中国科学院西安光学精密机械研究所 | Common-aperture infrared dual-waveband dual-field-of-view optical system |
| CN113448067A (en) * | 2021-05-21 | 2021-09-28 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
| CN113448067B (en) * | 2021-05-21 | 2022-05-20 | 中国科学院西安光学精密机械研究所 | Switching type zooming heat difference eliminating type long-wave infrared zoom lens |
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