CN112230411B - Catadioptric off-axis large-view-field imaging optical system - Google Patents
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- G02B17/0816—Catadioptric systems using two curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
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Abstract
A catadioptric off-axis large-field imaging optical system belongs to the technical field of optical application. The invention solves the problem that the imaging quality of an optical system is easily influenced because distortion is sensitive to the change of a wide camera field of view in the prior art. Coaxial refractor group includes along a plurality of lenses that light incident direction arranged in proper order with the optical axis, off-axis speculum group includes first speculum and the second mirror that the off-axis used, just first speculum is the even aspheric surface, the second mirror is the sphere. The coaxial refractor group bears main focal power, and corrects aberrations such as on-axis aberration, partial primary off-axis aberration, chromatic aberration and the like, so that the sensitivity of the off-axis reflector group is reduced to a certain degree, the first reflector can correct distortion and off-axis aberration residual error of the system, and the second reflector can calibrate the emergence angle of main light rays of each field of view of the system, thereby realizing telecentric focusing imaging in an image space.
Description
Technical Field
The invention relates to a catadioptric off-axis large-view-field imaging optical system, and belongs to the technical field of optical application.
Background
The space-to-ground observation optical system goes through the development stages from a refraction type to a reflection type and from an on-axis optical system to an off-axis optical system, the refraction type optical system is difficult to realize large-caliber and light-weight design due to the limitation of optical materials, the reflection system is less limited by materials, the light-weight design is convenient, chromatic aberration is completely avoided, and the system transmittance is high. Compared with the traditional refraction optical system, the off-axis reflection optical system has the characteristics of small volume, light weight, no chromatic aberration and the like, and is widely applied to the fields of telescope systems, space observation systems and the like. The space remote sensing optical system mostly adopts a catadioptric hybrid type and a total reflection type optical system. The catadioptric system adopts a mode of combining a reflector and a lens, the reflector does not cause chromatic aberration, and the lens group can correct the aberration of the whole system and increase the field of view of the whole optical system. In the whole catadioptric optical system, the displacement of the image plane is not influenced by the reflector, and when the expansion coefficients of the materials selected by the reflector and the bracket are close, the sensitivity of the whole system to the environmental temperature can be reduced. The catadioptric off-axis large-field imaging optical system improves the field size of the optical system and greatly improves the imaging quality of the system.
Disclosure of Invention
The invention provides a catadioptric off-axis large-view-field imaging optical system, which aims to solve the problem that in the prior art, the imaging quality of the optical system is easily influenced because distortion is sensitive to the change of a wide camera view field.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a big visual field of catadioptric formula off-axis optical imaging system that forms images, it includes that coaxial refractor group and off-axis speculum group, wherein coaxial refractor group includes a plurality of lenses that arrange in proper order along light incident direction with the optical axis, first speculum and second mirror that off-axis speculum group used, just first speculum is the even aspheric surface, and its off-axis angle for coaxial refractor group optical axis is 8, the second mirror is the sphere, and its off-axis angle for coaxial refractor group optical axis is 10.4.
Furthermore, the lenses are respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a sixth lens, and a sixth lens, a sixth lens, and a sixth lens, and a sixth lens, a sixth lens, a sixth lens, and a.
Furthermore, the focal powers of the first lens, the third lens, the fifth lens and the seventh lens are all positive, and the focal powers of the second lens, the fourth lens and the sixth lens are all negative.
Further, the optical system satisfies the following condition:
2.509<f/f1<2.589
-2.401<f/f2<-2.301
1.185<f/f3<1.245
-1.810<f/f4<-1.710
0.0103<f/f5<0.070
-2.488<f/f6<-2.448
3.546<f/f7<3.626
1.187<f/f8<1.227
1.561<f/f9<1.601
where f is a focal length of the entire optical system, f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, f7 is a focal length of the seventh lens, f8 is a focal length of the first mirror, and f9 is a focal length of the second mirror.
Further, the distance between the first lens and the second lens is 0.137mm, the distance between the second lens and the third lens is 2.548mm, the distance between the third lens and the fourth lens is 2.556mm, the distance between the fourth lens and the fifth lens is 0.122mm, the distance between the fifth lens and the aperture stop is 4.217mm, the distance between the aperture stop and the sixth lens is 0.120mm, the distance between the sixth lens and the seventh lens is 0.467mm, the distance between the seventh lens and the first reflector is 207.903mm, the distance between the first reflector and the second reflector is-192.903 mm, and the distance between the second reflector and the image plane is 279.345 mm.
Furthermore, the material of the first lens is H-ZBAF3, the material of the second lens is TF3, the material of the third lens is H-ZBAF5, the material of the fourth lens is TF3, the material of the fifth lens is H-ZK5, the material of the sixth lens is TF3, and the material of the seventh lens is H-ZBAF 3.
Further, the radius of curvature of the front surface of the first lens is 257.733mm, the radius of curvature of the rear surface is-290.252 mm, the center thickness is 11.988mm, and the aperture of the light transmission is phi 49.148 mm;
the curvature radius of the front surface of the second lens is-354.572 mm, the curvature radius of the rear surface of the second lens is 230.771mm, the center thickness of the second lens is 6.397mm, and the aperture of the light-transmitting lens is phi 47.796 mm;
the radius of curvature of the front surface of the third lens is 548.294mm, the radius of curvature of the rear surface of the third lens is-634.927 mm, the center thickness of the third lens is 9.602mm, and the aperture of the light transmission is phi 44.006 mm;
the curvature radius of the front surface of the fourth lens is-233.882 mm, the curvature radius of the rear surface of the fourth lens is 916.451mm, the center thickness of the fourth lens is 6.774mm, and the aperture of the light-transmitting lens is phi 42.557 mm;
the curvature radius of the front surface of the fifth lens is 164.689mm, the curvature radius of the rear surface of the fifth lens is 163.761mm, the center thickness of the fifth lens is 11.230mm, and the aperture of the light-transmitting lens is phi 39.421 mm;
the curvature radius of the front surface of the sixth lens is 1194.286mm, the curvature radius of the rear surface of the sixth lens is 7.978mm, the center thickness of the sixth lens is 7.978mm, and the aperture of the light-transmitting lens is phi 36.889 mm;
the curvature radius of the front surface of the seventh lens is 121.142mm, the curvature radius of the rear surface of the seventh lens is-483.2 mm, the center thickness of the seventh lens is 16.001mm, and the aperture of the light-transmitting lens is phi 39.657 mm;
the curvature radius of the surface of the first reflector is 885.416mm, and the aperture of the light transmission aperture is phi 86.848 mm;
the radius of curvature of the second reflector surface is 676.010mm, and the clear aperture is phi 165.357 mm.
Compared with the prior art, the invention has the following effects:
this application adopts different lens intercombination and rational distribution focal power, and the coaxial refractor group undertakes main focal power, corrects aberrations such as off-axis aberration, partial elementary off-axis aberration and colour difference, makes the sensitivity of off-axis refractor group obtain the reduction of certain degree, and first speculum can be corrected the distortion of system and off-axis aberration residual error, and the second speculum mainly plays the effect of field lens, can calibrate the emergence angle of each visual field chief ray of system, realizes the focus imaging of image side heart far away.
The application uses less aspheric surfaces, obtains good imaging quality in a large view field range, has small optical system volume, and simultaneously reduces the processing, detection and debugging difficulty of the system.
Drawings
FIG. 1 is a schematic diagram of an imaging optical system according to the present application;
fig. 2 is a schematic view of an optical Modulation Transfer Function (MTF) of an imaging optical system of the present application.
Detailed Description
The first embodiment is as follows: this embodiment is described with reference to fig. 1-2, a catadioptric off-axis large field of view imaging optical system, it includes coaxial refractor group, off-axis reflector group and image plane 11, wherein coaxial refractor group includes a plurality of lenses of arranging in proper order along light incident direction with the optical axis, off-axis reflector group includes first speculum 9 and second speculum 10 that the off-axis used, just first speculum 9 is the even aspheric surface, and its off-axis angle for coaxial refractor group optical axis is 8, second speculum 10 is the sphere, and its off-axis angle for coaxial refractor group optical axis is 10.4.
This application adopts different lens intercombination and rational distribution focal power, the coaxial refractor group undertakes main focal power, the aberration such as on-axis aberration, partial elementary off-axis aberration and colour difference is rectified, make the sensitivity of off-axis refractor group obtain the reduction of certain degree, and first speculum 9 can rectify distortion and off-axis aberration residual error of system, second speculum 10 mainly plays the effect of field lens, can calibrate the emergence angle of each visual field chief ray of system, realize the focus imaging of image side heart far away.
The imaging device is used for imaging the incident light beam in the visible light wave band.
The off-axis catadioptric imaging optical system comprises a free-form surface, uses fewer aspheric surfaces, obtains good imaging quality in a large view field range, is small in size, and simultaneously reduces the processing, detection and debugging difficulty of the system.
The specific parameters of the imaging optical system are as follows:
the focal length is 534.394mm, the relative aperture is F/6.8, and the field angle is +/-10.4 degrees;
the modulation transfer function MTF is a comprehensive evaluation index of the optical lens, and it can be known from FIG. 2 that at a spatial frequency of 50lp/mm, the MTF of each field of view of the system is close to a diffraction limit, which indicates that the off-axis catadioptric optical imaging system has good imaging quality in the full field of view.
The above description is only for the best mode of the present invention, but the scope of the present invention is not limited thereto, and any changes and substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
The lenses are respectively a first lens, a second lens, a third lens, a fourth lens, a fifth lens 5, a sixth lens 6 and a fifth lens 8. All the lenses are spherical lenses, so that the processing difficulty of the optical element is reduced, and the research and development cost is reduced.
The focal powers of the first lens 1, the third lens 3, the fifth lens 5 and the seventh lens 7 are all positive, and the focal powers of the second lens 2, the fourth lens 4 and the sixth lens 6 are all negative.
The optical system satisfies the following conditions:
2.509<f/f1<2.589
-2.401<f/f2<-2.301
1.185<f/f3<1.245
-1.810<f/f4<-1.710
0.0103<f/f5<0.070
-2.488<f/f6<-2.448
3.546<f/f7<3.626
1.187<f/f8<1.227
1.561<f/f9<1.601
where f is a focal length of the entire optical system, f1 is a focal length of the first lens 1, f2 is a focal length of the second lens 2, f3 is a focal length of the third lens 3, f4 is a focal length of the fourth lens 4, f5 is a focal length of the fifth lens 5, f6 is a focal length of the sixth lens 6, f7 is a focal length of the seventh lens 7, f8 is a focal length of the first reflecting mirror 9, and f9 is a focal length of the second reflecting mirror 10.
The distance between the first lens 1 and the second lens 2 is 0.137mm, the distance between the second lens 2 and the third lens 3 is 2.548mm, the distance between the third lens 3 and the fourth lens 4 is 2.556mm, the distance between the fourth lens 4 and the fifth lens 5 is 0.122mm, the distance between the fifth lens 5 and the aperture stop 8 is 4.217mm, the distance between the aperture stop 8 and the sixth lens 6 is 0.120mm, the distance between the sixth lens 6 and the seventh lens 7 is 0.467mm, the distance between the seventh lens 7 and the first reflector 9 is 207.903mm, the distance between the first reflector 9 and the second reflector 10 is-192.903 mm, and the distance between the second reflector 10 and the image plane 11 is 279.345 mm.
The material of the first lens 1 is H-ZBAF3, the material of the second lens 2 is TF3, the material of the third lens 3 is H-ZBAF5, the material of the fourth lens 4 is TF3, the material of the fifth lens 5 is H-ZK5, the material of the sixth lens 6 is TF3, and the material of the seventh lens 7 is H-ZBAF 3.
The curvature radius of the front surface of the first lens 1 is 257.733mm, the curvature radius of the rear surface is-290.252 mm, the center thickness is 11.988mm, and the clear aperture is phi 49.148 mm;
the curvature radius of the front surface of the second lens 2 is-354.572 mm, the curvature radius of the rear surface is 230.771mm, the center thickness is 6.397mm, and the light-passing aperture is phi 47.796 mm;
the radius of curvature of the front surface of the third lens 3 is 548.294mm, the radius of curvature of the rear surface is-634.927 mm, the center thickness is 9.602mm, and the light-transmitting aperture is phi 44.006 mm;
the curvature radius of the front surface of the fourth lens 4 is-233.882 mm, the curvature radius of the rear surface is 916.451mm, the center thickness is 6.774mm, and the light-passing aperture is phi 42.557 mm;
the curvature radius of the front surface of the fifth lens 5 is 164.689mm, the curvature radius of the rear surface is 163.761mm, the center thickness is 11.230mm, and the clear aperture is phi 39.421 mm;
the curvature radius of the front surface of the sixth lens 6 is 1194.286mm, the curvature radius of the rear surface is 7.978mm, the center thickness is 7.978mm, and the clear aperture is phi 36.889 mm;
the curvature radius of the front surface of the seventh lens 7 is 121.142mm, the curvature radius of the rear surface is-483.2 mm, the center thickness is 16.001mm, and the clear aperture is phi 39.657 mm;
the curvature radius of the surface of the first reflector 9 is 885.416mm, and the aperture of the light transmission aperture is phi 86.848 mm;
the curvature radius of the surface of the second reflecting mirror 10 is 676.010mm, and the aperture of the light transmission aperture is phi 165.357 mm. For convenience of description, the light incident surface of the lens is used as the front surface, and the light emergent surface of the lens is used as the rear surface.
Claims (5)
1. A catadioptric off-axis large-field imaging optical system is characterized in that: the optical lens comprises a coaxial refractor group, an off-axis reflector group and an image plane (11), wherein the coaxial refractor group consists of seven lenses which are sequentially arranged along the incident direction of light with the same optical axis, the seven lenses are respectively a first lens to a seventh lens, the off-axis reflector group consists of two reflectors used in an off-axis mode, the two reflectors are respectively a first reflector (9) and a second reflector (10), the first reflector (9) is an even aspheric surface, the off-axis angle of the first reflector relative to the optical axis of the coaxial refractor group is 8 degrees, the second reflector (10) is a spherical surface, and the off-axis angle of the second reflector relative to the optical axis of the coaxial refractor group is 10.4 degrees; the focal powers of the first lens (1), the third lens (3), the fifth lens (5) and the seventh lens (7) are all positive, and the focal powers of the second lens (2), the fourth lens (4) and the sixth lens (6) are all negative; the optical system satisfies the following conditions:
2.509<f/f1<2.589
-2.401<f/f2<-2.301
1.185<f/f3<1.245
-1.810<f/f4<-1.710
0.0103<f/f5<0.070
-2.488<f/f6<-2.448
3.546<f/f7<3.626
1.187<f/f8<1.227
1.561<f/f9<1.601
wherein f is the focal length of the whole optical system, f1 is the focal length of the first lens (1), f2 is the focal length of the second lens (2), f3 is the focal length of the third lens (3), f4 is the focal length of the fourth lens (4), f5 is the focal length of the fifth lens (5), f6 is the focal length of the sixth lens (6), f7 is the focal length of the seventh lens (7), f8 is the focal length of the first reflector (9), and f9 is the focal length of the second reflector (10).
2. The catadioptric off-axis large field of view imaging optical system of claim 1, wherein: the first lens, the second lens, the third lens, the fourth lens and the fifth lens are spherical surfaces, and an aperture diaphragm (8) is arranged between the fifth lens (5) and the sixth lens (6) on the same optical axis.
3. The catadioptric off-axis large-field imaging optical system according to claim 1 or 2, wherein: the distance between the first lens (1) and the second lens (2) is 0.137mm, the distance between the second lens (2) and the third lens (3) is 2.548mm, the distance between the third lens (3) and the fourth lens (4) is 2.556mm, the distance between the fourth lens (4) and the fifth lens (5) is 0.122mm, the distance between the fifth lens (5) and the aperture stop (8) is 4.217mm, the distance between the aperture stop (8) and the sixth lens (6) is 0.120mm, the distance between the sixth lens (6) and the seventh lens (7) is 0.467mm, the distance between the seventh lens (7) and the first reflector (9) is 207.903mm, the distance between the first reflector (9) and the second reflector (10) is 192.903mm, and the distance between the second reflector (10) and the image plane (11) is 279.345 mm.
4. The catadioptric off-axis large field of view imaging optical system of claim 1, wherein: the material of the first lens (1) is H-ZBAF3, the material of the second lens (2) is TF3, the material of the third lens (3) is H-ZBAF5, the material of the fourth lens (4) is TF3, the material of the fifth lens (5) is H-ZK5, the material of the sixth lens (6) is TF3, and the material of the seventh lens (7) is H-ZBAF 3.
5. The catadioptric off-axis large field imaging optical system of claim 1, 2 or 4, wherein: the curvature radius of the front surface of the first lens (1) is 257.733mm, the curvature radius of the rear surface is-290.252 mm, the center thickness is 11.988mm, and the light-passing aperture is phi 49.148 mm;
the curvature radius of the front surface of the second lens (2) is-354.572 mm, the curvature radius of the rear surface is 230.771mm, the center thickness is 6.397mm, and the light-passing aperture is phi 47.796 mm;
the curvature radius of the front surface of the third lens (3) is 548.294mm, the curvature radius of the rear surface is-634.927 mm, the center thickness is 9.602mm, and the light-transmitting aperture is phi 44.006 mm;
the curvature radius of the front surface of the fourth lens (4) is-233.882 mm, the curvature radius of the rear surface is 916.451mm, the center thickness is 6.774mm, and the light-passing aperture is phi 42.557 mm;
the curvature radius of the front surface of the fifth lens (5) is 164.689mm, the curvature radius of the rear surface of the fifth lens is 163.761mm, the center thickness of the fifth lens is 11.230mm, and the aperture of the light transmission is phi 39.421 mm;
the curvature radius of the front surface of the sixth lens (6) is 1194.286mm, the curvature radius of the rear surface of the sixth lens is 7.978mm, the center thickness of the sixth lens is 7.978mm, and the aperture of the light transmission is phi 36.889 mm;
the curvature radius of the front surface of the seventh lens (7) is 121.142mm, the curvature radius of the rear surface is-483.2 mm, the center thickness is 16.001mm, and the light-passing aperture is phi 39.657 mm;
the curvature radius of the surface of the first reflector (9) is 885.416mm, and the aperture of the light transmission is phi 86.848 mm;
the curvature radius of the surface of the second reflector (10) is 676.010mm, and the aperture of the light transmission aperture is phi 165.357 mm.
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Address after: No. 1299, Mingxi Road, Beihu science and Technology Development Zone, Changchun City, Jilin Province Patentee after: Changguang Satellite Technology Co.,Ltd. Address before: No. 1299, Mingxi Road, Beihu science and Technology Development Zone, Changchun City, Jilin Province Patentee before: CHANG GUANG SATELLITE TECHNOLOGY Co.,Ltd. |
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Denomination of invention: A reflective off-axis large field of view imaging optical system Granted publication date: 20220809 Pledgee: Jilin Shuangyang Rural Commercial Bank Co.,Ltd. Ecological Square sub branch Pledgor: Changguang Satellite Technology Co.,Ltd. Registration number: Y2024220000052 |