CN102023375A - Folding axis three-reflection optical system with long focal length, no distortion and flat image field - Google Patents
Folding axis three-reflection optical system with long focal length, no distortion and flat image field Download PDFInfo
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- CN102023375A CN102023375A CN2009100238945A CN200910023894A CN102023375A CN 102023375 A CN102023375 A CN 102023375A CN 2009100238945 A CN2009100238945 A CN 2009100238945A CN 200910023894 A CN200910023894 A CN 200910023894A CN 102023375 A CN102023375 A CN 102023375A
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- reflected light
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- 230000003287 optical effect Effects 0.000 title claims abstract description 55
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000005331 crown glasses (windows) Substances 0.000 claims description 3
- 239000005350 fused silica glass Substances 0.000 claims description 3
- 241000219739 Lens Species 0.000 claims 24
- 210000000695 crystalline len Anatomy 0.000 claims 24
- 238000003384 imaging method Methods 0.000 abstract description 7
- 238000000701 chemical imaging Methods 0.000 abstract description 5
- 238000013507 mapping Methods 0.000 abstract description 5
- 241000226585 Antennaria plantaginifolia Species 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 210000001747 pupil Anatomy 0.000 description 3
- 230000005855 radiation Effects 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
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Abstract
The invention relates to a folding axis three-reflection optical system with long focal length, no distortion and flat image field, which comprises a main reflector, a secondary reflector arranged on a reflection light path of the main reflector, a folding axis mirror and a third reflector, wherein the folding axis mirror is arranged on a reflection light path of the secondary reflector, the third reflector is arranged on a reflection light path of the folding axis mirror, at least one lens generating negative distortion is arranged on the reflection light path of the third reflector, the distance between the lens and an image plane is f/5-f/3, and f is the focal length of the third reflector. The optical system eliminates distortion, and can meet the requirements of space cameras for multispectral imaging, three-dimensional imaging, large-scale map mapping and the like on the optical system.
Description
Technical field
The invention belongs to the optical application technology, be specifically related to folding axle three reflecting optical systems of a kind of long-focus, undistorted, flattened field.
Background technology
The distortion that is produced by secondary mirror and three mirrors in the three-reflection optical system that generally uses now is pincushion distortion, when the field angle that reduces optical system or after amplifying the radius-of-curvature of principal reflection mirror, along with the height of incidence of light and reducing of incident angle, the distortion of whole optical system can diminish, but its distortion value can not satisfy the demand of space camera multispectral imaging, three-dimensional imaging and ground mapping less than 1%; And distortionless three reflecting optical system image planes are crooked, and the CCD image planes that cause splicing are crooked, more are unfavorable for using.
Summary of the invention
The distortion value that the objective of the invention is to solve the existing three-reflection optical system described in the background technology is big, curvature of the image is unfavorable for the defective used, and a kind of long-focus of suitable space camera, folding axle three reflecting optical systems of undistorted, flattened field are provided, to satisfy the space camera multispectral imaging, the demand of three-dimensional imaging and large-scale map mapping.
Technical solution of the present invention is: a kind of long-focus, undistorted, folding axle three reflecting optical systems of flattened field, comprise principal reflection mirror 1, be arranged on the secondary mirror 2 on the reflected light path of this principal reflection mirror 1, be arranged on the folding axle mirror 3 on the reflected light path of this secondary mirror 2 and be arranged on the 3rd catoptron 4 on the reflected light path of this folding axle mirror 3, its special character is, the reflected light path of the 3rd catoptron 4 is provided with a slice lens 5 at least, and these lens 5 are generally f/5-f/3 (wherein f is the focal length of the 3rd mirror) apart from the distance of image planes, and optimum distance is about apart from about the image planes 75mm (70-90mm); And this lens 5 adopt the positive lens of concavo-convex (the positive falcate) of two falcates, are used to offset secondary mirror 2 and the pincushion distortion that produced of catoptron 4 for the third time; In order better to eliminate this distortion, the lens combination of being made up of the negative lens of the positive lens of concavo-convex (positive falcate) and concave-concave can be set on the reflected light path of the 3rd catoptron 4, thereby better balance out the pincushion distortion that secondary mirror 2 and the 3rd catoptron 4 are produced.
Owing between optical system emergent pupil and image planes, place the anamorphic lens that disappears (group) in this optical system near image planes, in order to offset the pincushion distortion that secondary mirror and the 3rd catoptron are produced, simultaneously, the anamorphic lens that disappears (group) that adopts low-refraction, radiation-resistant optical material to make, with incident angle and the height of incidence that reduces system, obtain the effect of eliminating the total system distortion at last, satisfy space camera and be used for the demand to optical system such as multispectral imaging, three-dimensional imaging and large-scale map mapping, enlarged the range of application of system.
Description of drawings
Fig. 1 is the light path synoptic diagram that two optical systems of the present invention when disappearing anamorphic lens are set;
Fig. 2 is the light path synoptic diagram of the optical system of the present invention when a slice being set disappearing anamorphic lens;
Fig. 3 disappears that anamorphic lens is arranged on the reflected light path of folding axle mirror and near the light path synoptic diagram of the optical system of the present invention of image planes;
Fig. 4 disappears that anamorphic lens is arranged on the reflected light path of folding axle mirror and near another light path synoptic diagram of the optical system of the present invention of image planes;
Fig. 5 is optical system imaging quality distortion figure of the present invention;
Fig. 6 is an optical system imaging quality diffractogram of the present invention.
Embodiment
Referring to Fig. 1, optical system of the present invention is folding axle three reflecting optical systems, comprise principal reflection mirror 1, be arranged on secondary mirror 2 on the reflected light path of this principal reflection mirror 1, (a folding axle mirror 3 is 45 ° of placements to be arranged on folding axle mirror 3 on the reflected light path of this secondary mirror 2, the normal and the primary and secondary mirror optical axis included angle of folding axle mirror 3 are 45 °, and the optical axis of the optical axis of principal reflection mirror 1 and secondary mirror 2 overlaps.) and be arranged on the 3rd catoptron 4 on the reflected light path of this folding axle mirror 3, the reflected light path of the 3rd catoptron 4 is provided with a slice lens 5 (anamorphic lens disappears) at least and promptly places lens 5 between the emergent pupil of this optical system and image planes, and 5 groups of close image planes 6 of these lens, simultaneously, this lens 5 adopt the positive lens of concavo-convex (positive falcate), are used to offset secondary mirror 2 and the pincushion distortion that produced of catoptron 4 for the third time.
Referring to Fig. 2, for the better distortion of elimination system, the lens combination of being made up of the negative lens of the positive lens of concavo-convex (positive falcate) and concave-concave can be set on the reflected light path of the 3rd catoptron 4 in turn, and near the 3rd catoptron 4 is the positive lens of the positive lens of concavo-convex (positive falcate), this lens combination produces barrel distortion, thereby balances out the pincushion distortion that secondary mirror 2 and the 3rd catoptron 4 are produced.
Referring to Fig. 3,4, what wherein be different from optical system illustrated in figures 1 and 2 is, the position of folding axle mirror 3 and the 3rd catoptron 4 exchanges just, and promptly the 3rd catoptron 4 is arranged on the reflected light path of secondary mirror 2, and folding axle mirror 3 is arranged on the reflected light path of the 3rd catoptron 4; But wherein consistent is that the anamorphic lens that disappears (group) all is arranged between the emergent pupil and image planes 6 of system, and the anamorphic lens that disappears (group) is provided with near image planes 6.Folding axle mirror 3 in the light path shown in Figure 3 still is 45 ° of placements, and (promptly the normal and the primary and secondary mirror optical axis included angle of folding axle mirror 3 are 45 °, the optical axis of the optical axis of principal reflection mirror 1 and secondary mirror 2 overlaps), folding axle mirror placement location among Fig. 4 does not have specific (special) requirements, to meet arranging of image planes 6.
For incident angle and the height of incidence that reduces system, the positive lens of the anamorphic lens that disappears (group) in this system promptly concavo-convex (positive bent moon) and the negative lens of concave-concave all adopt low-refraction, radiation-resistant optical material to make, as fused quartz (JGS1), light crown glass optical materials such as (QK1, QK2, QK3).
As shown in Figure 5, do not have astigmatism in the optical system of the present invention substantially, the amount of distortion of system is controlled at below 0.01%; As seen from Figure 6, the image quality of this optical system has reached diffraction limit.
It should be noted that, this optical system especially is fit to bigbore space camera, focal length is preferably at 5000mm-15000mm, relative aperture is 1: 8-1: between 16, when the field angle of optical system during less than 1.6 °, the amount of distortion of optical system can be controlled at below 0.01%, when the field angle of optical system during greater than 1.6 ° but less than 2.6 °, optical system still can be controlled at below 0.05%, optical system is undistorted substantially, can satisfy the demand to optical system such as multispectral imaging, three-dimensional imaging and large-scale map mapping.
Claims (10)
1. folding axle three reflecting optical systems of a long-focus, undistorted, flattened field, comprise principal reflection mirror, be arranged on secondary mirror, folding axle mirror and the 3rd catoptron on the reflected light path of this principal reflection mirror, it is characterized in that: described folding axle mirror is arranged on the reflected light path of secondary mirror, described the 3rd catoptron is arranged on the reflected light path of this folding axle mirror, the reflected light path of the 3rd catoptron is provided with the lens of a slice generation barrel distortion at least, the distance of these lens distance image planes is f/5 to f/3, and wherein f is the focal length of the 3rd catoptron.
2. three reflecting optical systems according to claim 1 is characterized in that: the distance of described lens distance image planes is 70-90mm.
3. three reflecting optical systems according to claim 1 and 2 is characterized in that: described lens are positive lenss of positive falcate.
4. three reflecting optical systems according to claim 1 and 2, it is characterized in that: described lens are two, be arranged in turn on the reflected light path of the 3rd catoptron, and the lens nearer apart from the 3rd catoptron are concavo-convex positive lenss that another sheet lens are negative lenses of concave-concave.
5. three reflecting optical systems according to claim 1 is characterized in that: described lens are the lens that utilize fused quartz or light crown glass to make.
6. folding axle three reflecting optical systems of a long-focus, undistorted, flattened field, comprise principal reflection mirror, be arranged on secondary mirror, folding axle mirror and the 3rd catoptron on the reflected light path of this principal reflection mirror, it is characterized in that: described the 3rd catoptron is arranged on the reflected light path of secondary mirror, described folding axle mirror is arranged on the reflected light path of the 3rd catoptron, the reflected light path of this folding axle mirror is provided with a slice lens at least, and the distance of these lens distance image planes is f/5 to f/3, and wherein f is the focal length of the 3rd catoptron.
7. three reflecting optical systems according to claim 6 is characterized in that: the distance of described lens distance image planes is 70-90mm.
8. according to claim 6 or 7 described three reflecting optical systems, it is characterized in that: described lens are positive lenss of positive falcate.
9. according to claim 6 or 7 described three reflecting optical systems, it is characterized in that: described lens are two, are arranged in turn on the reflected light path of folding axle mirror, and are concavo-convex positive lenss apart from this folding nearer lens of mirror, and another sheet lens are negative lenses of concave-concave.
10. three reflecting optical systems according to claim 6 is characterized in that: described lens are the lens that utilize fused quartz or light crown glass to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100238945A CN102023375A (en) | 2009-09-11 | 2009-09-11 | Folding axis three-reflection optical system with long focal length, no distortion and flat image field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100238945A CN102023375A (en) | 2009-09-11 | 2009-09-11 | Folding axis three-reflection optical system with long focal length, no distortion and flat image field |
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| Publication Number | Publication Date |
|---|---|
| CN102023375A true CN102023375A (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100238945A Pending CN102023375A (en) | 2009-09-11 | 2009-09-11 | Folding axis three-reflection optical system with long focal length, no distortion and flat image field |
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| CN (1) | CN102023375A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526821A (en) * | 2016-11-30 | 2017-03-22 | 长光卫星技术有限公司 | Dual-mode space remote-sensing camera based on field-of-view light-splitting optical system |
| CN111025615A (en) * | 2019-12-28 | 2020-04-17 | 中国科学院长春光学精密机械与物理研究所 | Optical system |
| CN113238368A (en) * | 2021-05-18 | 2021-08-10 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Folding-axis three-reflection telescope objective lens without secondary blocking surface view field |
-
2009
- 2009-09-11 CN CN2009100238945A patent/CN102023375A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526821A (en) * | 2016-11-30 | 2017-03-22 | 长光卫星技术有限公司 | Dual-mode space remote-sensing camera based on field-of-view light-splitting optical system |
| CN111025615A (en) * | 2019-12-28 | 2020-04-17 | 中国科学院长春光学精密机械与物理研究所 | Optical system |
| CN113238368A (en) * | 2021-05-18 | 2021-08-10 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Folding-axis three-reflection telescope objective lens without secondary blocking surface view field |
| CN113238368B (en) * | 2021-05-18 | 2023-08-25 | 合肥综合性国家科学中心能源研究院(安徽省能源实验室) | Non-secondary blocking surface view field folded-axis three-mirror telescope objective lens |
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Application publication date: 20110420 |