CN209044173U - A kind of compact medium-wave infrared continuous vari-focus system - Google Patents
A kind of compact medium-wave infrared continuous vari-focus system Download PDFInfo
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- CN209044173U CN209044173U CN201821682634.XU CN201821682634U CN209044173U CN 209044173 U CN209044173 U CN 209044173U CN 201821682634 U CN201821682634 U CN 201821682634U CN 209044173 U CN209044173 U CN 209044173U
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- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 239000000571 coke Substances 0.000 claims description 19
- 230000005499 meniscus Effects 0.000 claims description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 238000009738 saturating Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 abstract description 4
- 230000007812 deficiency Effects 0.000 abstract description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 210000001747 pupil Anatomy 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
Abstract
The utility model relates to a kind of zoom system, pancreatic systems, long for existing refrigeration mode medium-wave infrared continuous vari-focus system structure size, it is difficult to the deficiencies of meeting lightweight requirements, and a kind of compact medium-wave infrared continuous vari-focus system is provided.Zoom system, pancreatic system includes first fixed group be sequentially coaxially arranged from left to right along optical axis direction, zoom group, compensation group, fixed group middle, focusing group and fixes group afterwards, and the left side of preceding fixed group is object plane, and the right side of rear fixed group is image planes；First fixed group is made of the first lens, zoom group is made of the second lens, compensation group is made of two lens, it is followed successively by the third lens and the 4th lens from left to right, middle fixed group is made of the 5th lens, and focusing group is made of the 6th lens, and rear fixed group is made of two lens, it is followed successively by the 7th lens and the 8th lens from left to right, zoom group and compensation group can be along optical axises towards or away from moving；For zoom group for realizing focal length consecutive variations, compensation group is mobile for compensating image planes caused by focal length variations.
Description
Technical field
The utility model relates to a kind of zoom system, pancreatic systems, and in particular to a kind of compact medium-wave infrared continuous vari-focus system.
Background technique
Infrared zoom optical system is the apparent passive detection optical system of a kind of function, such system can detect,
It positions and the object and target that emit infrared ray under Infrared background radiation and other interference is continuously tracked.Therefore it is searched in target
It seeks, early warning detection, the fields such as forest fire protection have broad application prospects.
Currently, refrigeration mode medium-wave infrared continuous vari-focus system is mostly that structure size is longer, weight is larger, can not well answer
In the system for aircraft pod, Portable vehicle-mounted etc. with lightweight requirements.In addition, due to such continuous vari-focus system motion row
Journey is longer, and the cam structure size resulted in the need for is larger, so that cam structure needs Precision Machining, not only cost is high；And it is convex
The actual processing precision of wheel construction is difficult to ensure, image quality in zooming procedure is caused also to be not easy to guarantee.
Utility model content
The purpose of the utility model is to overcome existing refrigeration mode medium-wave infrared continuous vari-focus system structure size is long, it is difficult to full
The deficiencies of sufficient lightweight requirements, and a kind of compact medium-wave infrared continuous vari-focus system is provided.
To achieve the above object, technical solution provided by the utility model is: a kind of compact medium-wave infrared continuous vari-focus
System is characterized in that, including first fixed group, zoom group, compensation being sequentially coaxially arranged from left to right along optical axis direction
Group, fixed group middle, focusing group and group is fixed afterwards, the left side of preceding fixed group is object plane, and the right side of rear fixed group is image planes；Preceding fixation
Group is made of the first lens, and the first lens are the meniscus lens that a positive light coke bends towards image space；Zoom group is by the second lens structure
At the second lens are the meniscus lens that a negative power bends towards image space；Compensation group is made of two lens, from left to right successively
For the third lens and the 4th lens, the third lens are the meniscus lens that a negative power bends towards image space, and the 4th lens are one
Positive light coke biconvex lens；Middle fixed group is made of the 5th lens, and the 5th lens are the bent moons that a positive light coke bends towards image space
Lens；Focusing group is made of the 6th lens, and the 6th lens are the meniscus lens that a positive light coke bends towards object space；Afterwards fix group by
Two lens compositions, are followed successively by the 7th lens and the 8th lens, the 7th lens are that a positive light coke bends towards object space from left to right
Meniscus lens, the 8th lens are the meniscus lens that a positive light coke bends towards object space；Zoom group and compensation group can be along optical axis phases
To or be moved away from；For zoom group for realizing focal length consecutive variations, compensation group is mobile for compensating image planes caused by focal length variations；
For optical system from short focus into focal length change procedure, zoom group is mobile to image space, realizes focal length consecutive variations compensation group to object space
It is mobile, continuous vari-focus is realized by interval variation.From focal length into short focus change procedure, direction changes phase to focal length with short focus
Instead, zoom group is to object space, and compensation group is to image space.
Further, from left to right along optical axis, before the rear surface to the second lens of zoom group of the first lens of preceding fixed group
The distance between surface is 19.03mm~35.22mm；Preceding table of the rear surface of the second lens of zoom group to compensation group the third lens
The distance between face is 2.45mm~72.16mm；Preceding table of the rear surface of the 4th lens of compensation group to the 5th lens of middle fixed group
The distance between face is 1mm~54.72mm；The rear surface of the 5th lens of middle fixed group to the 6th lens of focusing group front surface it
Between distance be 12.54mm；The distance between the front surface of the 7th lens of fixed group after the rear surface of the 6th lens of focusing group arrives
For 3mm.
Further, above-mentioned second lens, the third lens, the 6th lens and the 7th lens are germainium lens, the first lens,
4th lens.5th lens and the 8th lens are silicon lens.
Further, above-mentioned first lens with a thickness of 10.31mm；Its front surface is spherical surface, radius of curvature 78mm；Afterwards
Surface is aspherical, radius of curvature 153.47mm, and asphericity coefficient is A=7.85 × 10-8, B=-2.95 × 10-13, C=-
4.41×10-15, D=4.29 × 10-18。
Further, above-mentioned second lens with a thickness of 3mm；Its front surface be it is aspherical, radius of curvature be-
406.235mm, asphericity coefficient are A=3.73 × 10-6, B=-5.27 × 10-9, C=5.53 × 10-12, D=1.14 × 10-13, E=-4.81 × 10-16；Rear surface is spherical surface, radius of curvature 47.3mm.
Further, above-mentioned the third lens with a thickness of 3mm；Its front surface is spherical surface, radius of curvature 297.25mm；Afterwards
Surface is aspherical, radius of curvature 47.49mm, and asphericity coefficient is A=-9.77 × 10-6, B=8.27 × 10-10, C=
1.38×10-12, D=2.85 × 10-14, E=-2.14 × 10-16.Above-mentioned 4th lens with a thickness of 4mm；Its front surface is non-
Spherical surface, radius of curvature 55.27mm, asphericity coefficient are A=-9.93 × 10-6, B=5.54 × 10-9, C=-1.3 × 10-11,
D=5 × 10-14, E=-1.51 × 10-16；Rear surface is spherical surface, and radius of curvature is -87.65mm.
Further, above-mentioned 5th lens with a thickness of 3.66mm；Its front surface is spherical surface, radius of curvature 13.8mm；
Rear surface is aspherical, radius of curvature 15.97mm, and asphericity coefficient is A=3.23 × 10-6, B=2.75 × 10-8, C=-
1.16×10-10, D=1.26 × 10-12。
Further, above-mentioned 6th lens with a thickness of 4.4mm；Its front surface be it is aspherical, radius of curvature be-
6.28mm, asphericity coefficient are A=5.56 × 10-3, B=7.17 × 10-4, C=-5.39 × 10-4, D=8.5 × 10-5；Table afterwards
Face be it is aspherical, radius of curvature be -7.66mm, asphericity coefficient be A=9.24 × 10-4, B=9.54 × 10-5, C=-8.7 ×
10-6, D=9.34 × 10-7。
Further, above-mentioned 7th lens with a thickness of 4.48mm；Its front surface be it is aspherical, radius of curvature be-
17.42mm, asphericity coefficient are A=-6.05 × 10-5, B=-3.3 × 10-6, C=1.87 × 10-6, D=-6.17 × 10-8；Afterwards
Surface be it is aspherical, radius of curvature be -71.99mm, asphericity coefficient A=9.32 × 10-5, B=8.68 × 10-7, C=9.39
×10-8, D=-2.23 × 10-9。
Further, above-mentioned 8th lens with a thickness of 3mm, front surface is spherical surface, and radius of curvature is -152.44mm；
Rear surface is spherical surface, and radius of curvature is -11.47mm.
The utility model has the advantages that:
Continuous vari-focus system provided by the utility model has size is small, light-weight, zoom stroke is short, image quality is high etc.
Feature.Can reasonable distribution focal power, optical system structure is compact, and overall length is shorter, suitable for limited spaces such as airbornes
Working environment and condition.
Detailed description of the invention
Fig. 1 is the utility model embodiment focal length state light path figure；
Fig. 2 is coke-like state index path in the utility model embodiment；
Fig. 3 is the utility model embodiment short focus state light path figure；
Fig. 4 is that the utility model embodiment spatial frequency is 33lp/mm, the MTF curve figure of focal length state optical system；
Fig. 5 is that the utility model embodiment spatial frequency is 33lp/mm, the MTF curve figure of middle coke-like state optical system；
Fig. 6 is that the utility model embodiment spatial frequency is 33lp/mm, the MTF curve figure of short focus state optical system；
Fig. 7 is the utility model embodiment focal length state distortion curve；
Fig. 8 is coke-like state distortion curve in the utility model embodiment；
Fig. 9 is the utility model embodiment short focus state distortion curve.
Each label is described as follows in figure:
1-the first lens, the 2-the second lens, 3-the third lens, the 4-the four lens, the 5-the five lens, 6-the six are thoroughly
Mirror, the 7-the seven lens, the 8-the eight lens.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.
As shown in Fig. 1,2,3 and table 1,25mm~300mm/F4 refrigeration mode medium-wave infrared continuous vari-focus provided in this embodiment
Optical system, using 6 group of 8 slice structure, focal-distance tuning range is 25mm~300mm, and F number is 4, be suitable for resolution ratio 640 ×
512,15 μm of thermal infrared imagers of pixel dimension, cold shield efficiency 100%, system overall length 170mm.
Compact medium-wave infrared continuous vari-focus system, including the preceding fixation being sequentially coaxially arranged from left to right along optical axis direction
Group, zoom group, compensation group, fixed group middle, focusing group and group is fixed afterwards, the left side of preceding fixed group is object plane, the right side of rear fixed group
Side is image planes；First fixed group is made of the first lens 1, and the first lens 1 are the bent moon silicon lens that a positive light coke bends towards image space；
Preceding fixed group has positive light coke and focal length is shorter, and it is compact to be conducive to system structure；Zoom group is made of the second lens 2, and second
Lens 2 are the bent moon germainium lens that a negative power bends towards image space；Compensation group is made of two lens, is followed successively by from left to right
Three lens 3 and the 4th lens 4, the third lens 3 are the bent moon germainium lens that a negative power bends towards image space, and the 4th lens 4 are one
A positive light coke biconvex silicon lens；Middle fixed group is made of the 5th lens 5, and the 5th lens 5 are that a positive light coke bends towards image space
Bent moon silicon lens；Middle fixed group converges in target picture at image planes；Focusing group is made of the 6th lens 6, the 6th lens 6
It is the bent moon germainium lens that a positive light coke bends towards object space；Focusing group realizes temperature and apart from focusing function；Group is fixed afterwards by two
A lens composition, is followed successively by the 7th lens 7 and the 8th lens 8, the 7th lens 7 are that a positive light coke bends towards object space from left to right
Bent moon germainium lens, the 8th lens 8 are the bent moon silicon lens that a positive light coke bends towards object space；Group is fixed afterwards light
It is poly-, it is imaged on thermal imaging system target surface, and combine focusing group entrance pupil will be projected to cold screen position jointly, realizes diaphragm and cold screen
Match, optical system bore can be effectively reduced.
Zoom group and compensation group can be along optical axises towards or away from moving；Zoom group is for realizing focal length consecutive variations, compensation
Group is mobile for compensating image planes caused by focal length variations.Optical system is from short focus into focal length change procedure, and zoom group is to image space
It is mobile, it realizes that focal length consecutive variations compensation group is mobile to object space, continuous vari-focus is realized by interval variation.Become from focal length to short focus
During change, direction and short focus change to focal length on the contrary, zoom group is to object space, and compensation group is to image space.
From left to right along optical axis, the rear surface of the first lens 1 of preceding fixed group is between the front surface of the second lens of zoom group 2
Distance be 19.03mm~35.22mm；The rear surface of the second lens of zoom group 2 is between the front surface of compensation group the third lens 3
Distance be 2.45mm~72.16mm；Front surface the distance between of the rear surface of compensation group the third lens 3 to the 4th lens 4
For 1.06mm；The rear surface of the 4th lens 4 of compensation group to the distance between front surface of the 5th lens 5 of middle fixed group for 1mm~
54.72mm；The distance between the front surface of rear surface to the 6th lens 6 of focusing group of the 5th lens 5 of middle fixed group is
12.54mm；The distance between front surface of the 7th lens 7 of fixed group is 3mm after the rear surface of the 6th lens 6 of focusing group arrives.Gu
Surely organize the rear surfaces of the 7th lens 7 to the distance between the front surface of the 8th lens 8 be 0.5mm.
The design parameter (unit: mm) of 1 each lens of the present embodiment optical system of table
The present embodiment continuous vari-focus system, will be different by first fixed group, zoom group, compensation group and middle fixed group collective effect
Target imaging when focal length is at an image planes, by the 5th lens, the 6th lens, the 7th lens (projection microscope group) by object at certain
The microscope group of fixed position is projected to after ratio enlargement or diminution.First lens to the 7th lens correct picture using high order aspheric surface
Difference, realize compact dimensions in the case of have compared with high imaging quality.
Such as MTF curve of Fig. 4~system shown in Figure 9 under focal length, middle burnt, short focus state, when spatial frequency is 33lp/mm
For value as can be seen that having preferable image quality, full filed distortion is smaller, can satisfy infrared target search and track requirement.
Claims (10)
1. a kind of compact medium-wave infrared continuous vari-focus system, it is characterised in that: including successively same from left to right along optical axis direction
First fixed group of axis setting, zoom group, compensation group, fixed group middle, focusing group and fix group afterwards, the left side of preceding fixed group is object
The right side in face, rear fixed group is image planes；
First fixed group is made of the first lens (1), and the first lens (1) are the meniscus lens that a positive light coke bends towards image space；
Zoom group is made of the second lens (2), and the second lens (2) are the meniscus lens that a negative power bends towards image space；
Compensation group is made of two lens, is followed successively by the third lens (3) and the 4th lens (4) from left to right, and the third lens (3) are
One negative power bends towards the meniscus lens of image space, and the 4th lens (4) are a positive light coke biconvex lens；
Middle fixed group is made of the 5th lens (5), and the 5th lens (5) are the meniscus lens that a positive light coke bends towards image space；
Focusing group is made of the 6th lens (6), and the 6th lens (6) are the meniscus lens that a positive light coke bends towards object space；
Group is fixed afterwards to be made of two lens, is followed successively by the 7th lens (7) and the 8th lens (8), the 7th lens (7) from left to right
It is the meniscus lens that a positive light coke bends towards object space, the 8th lens (8) are the meniscus lens that a positive light coke bends towards object space；
Zoom group and compensation group can be along optical axises towards or away from moving；Zoom group is used for realizing focal length consecutive variations, compensation group
It is mobile in compensating image planes caused by focal length variations.
2. a kind of compact medium-wave infrared continuous vari-focus system according to claim 1, it is characterised in that: certainly left along optical axis
To the right side,
The rear surface of preceding fixed group the first lens (1) to the distance between the front surface of the second lens of zoom group (2) be 19.03mm
~35.22mm；
The rear surface of the second lens of zoom group (2) to the distance between the front surface of compensation group the third lens (3) for 2.45mm~
72.16mm；
The rear surface of compensation group the third lens (3) to the distance between the front surface of the 4th lens (4) be 1.06mm；
The rear surface of the 4th lens (4) of compensation group to the distance between front surface of the 5th lens (5) of middle fixed group for 1mm~
54.72mm；
The distance between the front surface of rear surface to the 6th lens (6) of focusing group of the 5th lens (5) of middle fixed group is
12.54mm；
The distance between front surface of the 7th lens (7) of fixed group is 3mm after the rear surface of the 6th lens (6) of focusing group arrives；
The rear surface of the 7th lens (7) of fixed group to the distance between the front surface of the 8th lens (8) be 0.5mm.
3. a kind of compact medium-wave infrared continuous vari-focus system according to claim 1 or 2, it is characterised in that: described
Two lens (2), the third lens (3), the 6th lens (6) and the 7th lens (7) are germainium lens, the first lens (1), the 4th lens
(4), the 5th lens (5) and the 8th lens (8) are silicon lens.
4. a kind of compact medium-wave infrared continuous vari-focus system according to claim 3, it is characterised in that: described first thoroughly
Mirror with a thickness of 10.31mm；Its front surface is spherical surface, radius of curvature 78mm；
Rear surface is aspherical, radius of curvature 153.47mm, and asphericity coefficient is A=7.85 × 10-8, B=-2.95 × 10-13, C=-4.41 × 10-15, D=4.29 × 10-18。
5. a kind of compact medium-wave infrared continuous vari-focus system according to claim 4, it is characterised in that: described second thoroughly
Mirror with a thickness of 3mm；Its front surface be it is aspherical, radius of curvature be -406.235mm, asphericity coefficient be A=3.73 × 10-6,
B=-5.27 × 10-9, C=5.53 × 10-12, D=1.14 × 10-13, E=-4.81 × 10-16；
Rear surface is spherical surface, radius of curvature 47.3mm.
6. a kind of compact medium-wave infrared continuous vari-focus system according to claim 5, it is characterised in that: the third is saturating
Mirror with a thickness of 3mm；Its front surface is spherical surface, radius of curvature 297.25mm；
Rear surface is aspherical, radius of curvature 47.49mm, and asphericity coefficient is A=-9.77 × 10-6, B=8.27 × 10-10,
C=1.38 × 10-12, D=2.85 × 10-14, E=-2.14 × 10-16；
4th lens with a thickness of 4mm；Its front surface is aspherical, radius of curvature 55.27mm, asphericity coefficient A
=-9.93 × 10-6, B=5.54 × 10-9, C=-1.3 × 10-11, D=5 × 10-14, E=-1.51 × 10-16；Rear surface is ball
Face, radius of curvature are -87.65mm.
7. a kind of compact medium-wave infrared continuous vari-focus system according to claim 6, it is characterised in that: the described 5th thoroughly
Mirror with a thickness of 3.66mm；Its front surface is spherical surface, radius of curvature 13.8mm；
Rear surface is aspherical, radius of curvature 15.97mm, and asphericity coefficient is A=3.23 × 10-6, B=2.75 × 10-8, C
=-1.16 × 10-10, D=1.26 × 10-12。
8. a kind of compact medium-wave infrared continuous vari-focus system according to claim 7, it is characterised in that: the described 6th thoroughly
Mirror with a thickness of 4.4mm；Its front surface be it is aspherical, radius of curvature be -6.28mm, asphericity coefficient be A=5.56 × 10-3, B
=7.17 × 10-4, C=-5.39 × 10-4, D=8.5 × 10-5；
Rear surface be it is aspherical, radius of curvature be -7.66mm, asphericity coefficient be A=9.24 × 10-4, B=9.54 × 10-5, C
=-8.7 × 10-6, D=9.34 × 10-7。
9. a kind of compact medium-wave infrared continuous vari-focus system according to claim 8, it is characterised in that: the described 7th thoroughly
Mirror with a thickness of 4.48mm；Its front surface be it is aspherical, radius of curvature be -17.42mm, asphericity coefficient be A=-6.05 ×
10-5, B=-3.3 × 10-6, C=1.87 × 10-6, D=-6.17 × 10-8；
Rear surface be it is aspherical, radius of curvature be -71.99mm, asphericity coefficient A=9.32 × 10-5, B=8.68 × 10-7, C=
9.39×10-8, D=-2.23 × 10-9。
10. a kind of compact medium-wave infrared continuous vari-focus system according to claim 9, it is characterised in that: the described 8th
Lens with a thickness of 3mm, front surface is spherical surface, and radius of curvature is -152.44mm；Rear surface is spherical surface, radius of curvature is-
11.47mm。
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| CN201821682634.XU CN209044173U (en) | 2018-10-17 | 2018-10-17 | A kind of compact medium-wave infrared continuous vari-focus system |
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| CN201821682634.XU CN209044173U (en) | 2018-10-17 | 2018-10-17 | A kind of compact medium-wave infrared continuous vari-focus system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254390A (en) * | 2018-10-17 | 2019-01-22 | 中国科学院西安光学精密机械研究所 | A kind of compact medium-wave infrared continuous vari-focus system |
| CN114035308A (en) * | 2021-11-23 | 2022-02-11 | 中国航空工业集团公司洛阳电光设备研究所 | Large-relative-aperture compact type uncooled infrared zooming monitoring lens |
| CN116068733A (en) * | 2022-12-16 | 2023-05-05 | 福建福光股份有限公司 | Refractive-reflective medium-wavelength focal lens |
-
2018
- 2018-10-17 CN CN201821682634.XU patent/CN209044173U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254390A (en) * | 2018-10-17 | 2019-01-22 | 中国科学院西安光学精密机械研究所 | A kind of compact medium-wave infrared continuous vari-focus system |
| CN109254390B (en) * | 2018-10-17 | 2023-12-08 | 中国科学院西安光学精密机械研究所 | Compact medium wave infrared continuous zooming system |
| CN114035308A (en) * | 2021-11-23 | 2022-02-11 | 中国航空工业集团公司洛阳电光设备研究所 | Large-relative-aperture compact type uncooled infrared zooming monitoring lens |
| CN114035308B (en) * | 2021-11-23 | 2023-09-19 | 中国航空工业集团公司洛阳电光设备研究所 | Large-relative-aperture compact uncooled infrared zoom monitoring lens |
| CN116068733A (en) * | 2022-12-16 | 2023-05-05 | 福建福光股份有限公司 | Refractive-reflective medium-wavelength focal lens |
| CN116068733B (en) * | 2022-12-16 | 2024-03-15 | 福建福光股份有限公司 | Refractive-reflective medium-wavelength focal lens |
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Granted publication date: 20190628 Effective date of abandoning: 20231208 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190628 Effective date of abandoning: 20231208 |