CN116755232B - Catadioptric optical lens - Google Patents
Catadioptric optical lens Download PDFInfo
- Publication number
- CN116755232B CN116755232B CN202311015494.6A CN202311015494A CN116755232B CN 116755232 B CN116755232 B CN 116755232B CN 202311015494 A CN202311015494 A CN 202311015494A CN 116755232 B CN116755232 B CN 116755232B
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- mirror
- meniscus lens
- reflector
- order coefficient
- coefficient alpha
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- 230000003287 optical effect Effects 0.000 title claims abstract description 34
- 230000005499 meniscus Effects 0.000 claims abstract description 41
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000005350 fused silica glass Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 238000003384 imaging method Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012634 optical imaging Methods 0.000 abstract description 3
- 238000010183 spectrum analysis Methods 0.000 abstract description 3
- 230000004075 alteration Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000386 microscopy Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/082—Catadioptric systems using three curved mirrors
- G02B17/0828—Catadioptric systems using three curved mirrors off-axis or unobscured systems in which all of the mirrors share a common axis of rotational symmetry
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention provides a catadioptric optical lens, which consists of a reflector main mirror S1, a reflector secondary mirror S2 and a meniscus lens, wherein the reflector main mirror S1, the reflector secondary mirror S2, a meniscus lens convex surface S3 and a meniscus lens concave surface S4 are all aspheric surfaces. Parallel light entering from different angles passes through the lens and is focused at different positions on the focal plane S5. By combining the improved reflective telescope configuration with the meniscus lens, the incident parallel light in the wavelength range of 400 nm-700 nm and the view angle range of-3 degrees can be focused on the focal plane S5, so that the spot RMS is smaller than 0.6um, and the imaging effect is close to the diffraction limit of visible light. The optical lens configuration of the invention is suitable for optical imaging, spectral analysis and other applications.
Description
Technical Field
The present invention relates to optical devices, and more particularly, to a refractive optical lens.
Background
The catadioptric optical lens has wide application in various fields. Its unique design combines the advantages of lenses and mirrors, providing longer focal length, compact size and lower aberrations. This makes the catadioptric optical lens an ideal choice in the fields of photography, astronomical observation, microscopy, optical measurement instruments, etc. In photography, catadioptric lenses are often used for long focal length lenses, providing high magnification and smaller size, suitable for shooting distant subjects. In astronomical observations, catadioptric optical lenses can provide large aperture and long focal length for observing distant celestial bodies. In a microscope, the catadioptric optical lens provides a longer working distance and a large field of view, and is convenient for biological research and medical diagnosis. In an optical measuring instrument, the long focal length and high-quality image imaging capability of the catadioptric optical lens make the catadioptric optical lens an important component of precision measuring equipment such as a laser range finder, an optical projector and the like.
Disclosure of Invention
The invention provides a catadioptric optical lens, which consists of a reflector main mirror, a reflector secondary mirror and a meniscus lens, wherein the reflector main mirror S1, the reflector secondary mirror S2, the meniscus lens convex surface S3 and the meniscus lens concave surface S4 are all aspheric surfaces. Parallel light entering from different angles passes through the lens and is focused at different positions on the focal plane S5.
By combining the improved reflective telescope configuration with the meniscus lens, the incident parallel light in the wavelength range of 400-700 nm and the view angle range of-3 degrees can be focused on the focal plane S5, so that the spot RMS is smaller than 0.6um, and the imaging effect is close to the diffraction limit of visible light. The optical lens configuration of the invention is suitable for optical imaging, spectral analysis and other applications.
The technical scheme of the invention is as follows: an catadioptric optical lens.
The lens parameters of the invention include:
the reflector main mirror S1 is a concave reflector with holes, the diameter is 26 mm-32 mm, the clear aperture is 24 mm-30 mm, the center thickness is 10mm, the center opening diameter is 10 mm-15 mm, the curvature radius is-120 mm to-80 mm, the conical coefficient k satisfies-1 < k < 0, the second-order coefficient alpha 2 > 0, the fourth-order coefficient alpha 4 > 0 and the sixth-order coefficient alpha 6 > 0;
the mirror sub-mirror S2 is a convex mirror with the diameter of 12 mm-16 mm, the clear aperture of 10 mm-14 mm, the center thickness of 5mm, the curvature radius of 30 mm-60 mm, the cone coefficient k satisfies-5 < k < -4 >, the second-order coefficient alpha 2 > 0, the fourth-order coefficient alpha 4 < 0 and the sixth-order coefficient alpha 6 > 0;
the meniscus lens convex surface S3 has a clear aperture of 12 mm-16 mm, a curvature radius of 100 mm-1000 mm, a conical coefficient k=0, a second-order coefficient alpha 2 > 0, a fourth-order coefficient alpha 4 > 0 and a sixth-order coefficient alpha 6 < 0;
the concave surface S4 of the meniscus lens has a clear aperture of 12 mm-16 mm, a curvature radius of-500 mm-50 mm, a conical coefficient k=0, a second-order coefficient alpha 2 > 0, a fourth-order coefficient alpha 4 > 0 and a sixth-order coefficient alpha 6 > 0;
the material of the meniscus lens is fused silica (refractive index Nd= 1.45846368692,Abbe Vd = 67.82143343), the diameter of the meniscus lens is 14 mm-18 mm, and the center thickness is 2mm;
the distance between the reflecting mirror main mirror S1 and the reflecting mirror secondary mirror S2 is 20-50 mm, the distance between the reflecting mirror secondary mirror S2 and the convex surface S3 of the meniscus lens is 30-60 mm, and the distance between the concave surface S4 of the meniscus lens and the focal plane S5 is 20-40 mm;
the reflecting mirror main mirror S1 and the reflecting mirror sub-mirror S2 are plated with a protective silver reflecting film or a dielectric reflecting film, and the reflectivity is more than 98% for the wave band of 400 nm-700 nm.
The invention has the beneficial effects that:
1. the refraction and reflection type optical lens is provided, and for incident light with a wave band of 400-700 nm and a field angle range of-3 degrees, light spots RMS on a focal plane are smaller than 0.6um, and an imaging effect is close to a diffraction limit.
2. The optical lens is composed of the reflector main mirror, the reflector secondary mirror and the meniscus lens, compared with the lens composed of a plurality of lenses, the optical lens is simpler in structure, smaller in aberration and chromatic aberration and suitable for optical imaging, spectral analysis and other applications.
Drawings
Fig. 1 is a schematic view of the optical path structure of the present invention.
Fig. 2 is a schematic view of an optical path according to a first embodiment of the present invention.
FIG. 3 is a schematic diagram of an optical system image point according to a first embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples of implementation.
In the embodiment of the invention, the optical path structure is as shown in fig. 1: the optical lens consists of a reflector main mirror, a reflector secondary mirror and a meniscus lens, wherein the reflector main mirror S1, the reflector secondary mirror S2, the meniscus lens convex surface S3 and the meniscus lens concave surface S4 are all aspheric surfaces, and the focal plane S5 is a focal plane. The aspherical surfaces S1, S2, S3, S4 satisfy the formula (1):
in the formula (1), z (R) is displacement of the aspheric surface in the z-axis direction, where the distance z-axis is R, relative to the vertex of the aspheric surface in the z-axis direction, R is the radius of curvature of the aspheric surface (R > 0 is convex, R < 0 is concave), k is the conic coefficient of the curved surface (k < -1 is hyperbola; k= -1 is parabolic; k > -1 is elliptical; k=0 is a circle), α2 is a second-order coefficient, α4 is a fourth-order coefficient, and α6 is a sixth-order coefficient.
The reflector main mirror S1 is a concave reflector with holes, the diameter is 26 mm-32 mm, the clear aperture is 24 mm-30 mm, the center thickness is 10mm, the center opening diameter is 10 mm-15 mm, the curvature radius is-120 mm to-80 mm, the conical coefficient k satisfies-1 < k < 0, the second-order coefficient alpha 2 > 0, the fourth-order coefficient alpha 4 > 0 and the sixth-order coefficient alpha 6 > 0;
the mirror sub-mirror S2 is a convex mirror with the diameter of 12 mm-16 mm, the clear aperture of 10 mm-14 mm, the center thickness of 5mm, the curvature radius of 30 mm-60 mm, the cone coefficient k satisfies-5 < k < -4 >, the second-order coefficient alpha 2 > 0, the fourth-order coefficient alpha 4 < 0 and the sixth-order coefficient alpha 6 > 0; after being reflected by the reflector main mirror S1, the optical axis direction of the reflector secondary mirror S2 is opposite to the main optical axis direction of the lens, and the curvature radius of the reflector secondary mirror S2 takes a positive value;
the meniscus lens convex surface S3 has a clear aperture of 12 mm-16 mm, a curvature radius of 100 mm-1000 mm, a conical coefficient k=0, a second-order coefficient alpha 2 > 0, a fourth-order coefficient alpha 4 > 0 and a sixth-order coefficient alpha 6 < 0;
the concave surface S4 of the meniscus lens has a clear aperture of 12 mm-16 mm, a curvature radius of-500 mm-50 mm, a conical coefficient k=0, a second-order coefficient alpha 2 > 0, a fourth-order coefficient alpha 4 > 0 and a sixth-order coefficient alpha 6 > 0;
the material of the meniscus lens is fused silica (refractive index Nd= 1.45846368692,Abbe Vd = 67.82143343), the diameter of the meniscus lens is 14 mm-18 mm, and the center thickness is 2mm;
the distance d1 between the reflector main mirror S1 and the reflector secondary mirror S2 is 20-50 mm, the distance d2 between the reflector secondary mirror S2 and the convex surface S3 of the meniscus lens is 30-60 mm, the central thickness d3=2mm of the meniscus lens, and the distance d4 between the concave surface S4 of the meniscus lens and the focal plane S5 is 20-40 mm;
in a specific embodiment, the optical path is as shown in fig. 1: d1 35mm, d2=38 mm, d3=2 mm, d4=30 mm. The reflecting mirror main mirror S1 and the reflecting mirror sub-mirror S2 are plated with a protective silver reflecting film or a dielectric reflecting film, and the reflectivity is more than 98% for the wave band of 400 nm-700 nm. The center thickness of the reflector main mirror S1 is 10mm, the diameter is 28mm, the clear aperture is 25mm, the curvature radius R= -100mm, and the diameter of the center hole is 12mm. The mirror sub-mirror S2 has a center thickness of 5mm, a diameter of 14mm, a clear aperture of 12mm and a radius of curvature r=45 mm. The meniscus lens material is fused silica (refractive index nd= 1.45846368692,Abbe Vd = 67.82143343), the radius of curvature r= 399.606mm of the meniscus lens convex surface S3, and the radius of curvature r= -134.534mm of the meniscus lens concave surface S4. The meniscus lens diameter is 16mm and the clear aperture of the meniscus lens is 14mm. Specific parameters of the mirror primary mirror S1, the mirror secondary mirror S2, the meniscus lens convex surface S3, and the meniscus lens concave surface S4 are shown in table 1.
In the present embodiment, fig. 2 is a view angle diagram of incident light having angles of view of 0 °, 0.5 °, 1 °, 1.5 °, 2 °, 2.5 °, and 3 °, and wavelengths of 400nm, 500nm, 600nm, and 700nm, respectively, passing through an optical lens. The corresponding image quality point list of the optical system is shown in fig. 3: the spot RMS of the parallel light of the incident lens on the focal plane in the wave band of 400-700 nm and the view angle range of 0-3 degrees is smaller than 0.6um. The imaging effect is close to the diffraction limit of visible light.
TABLE 1
In the present embodiment, the main optical indexes are as follows:
1. lens focal length f=142 mm;
2. relative pore size: d/f=1/5.68;
3. angle of view: 6 ° (-3 °);
4. designing a wave band: 400-700 nm;
5. field spot RMS: the 0℃field spot RMS was 0.18. Mu.m, and the 3℃field spot RMS was 0.54. Mu.m (see FIG. 3).
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (2)
1. The catadioptric optical lens is characterized in that: the novel lens comprises a reflector main mirror (S1), a reflector secondary mirror (S2) and a meniscus lens, wherein the reflector main mirror (S1), the reflector secondary mirror (S2), a meniscus lens convex surface (S3) and a meniscus lens concave surface (S4) are all aspheric surfaces; the reflector main mirror (S1) is a concave reflector with holes, the clear aperture is 24-30 mm, the center thickness is 10mm, the center opening diameter is 10-15 mm, the curvature radius is-120 mm to-80 mm, the conical coefficient k satisfies-1 < k < 0, the second-order coefficient alpha 2 is more than 0, the fourth-order coefficient alpha 4 is more than 0, and the sixth-order coefficient alpha 6 is more than 0; the reflecting mirror secondary mirror (S2) is a convex reflecting mirror, the clear aperture is 10 mm-14 mm, the center thickness is 5mm, the curvature radius is 30 mm-60 mm, the conical coefficient k satisfies-5 < k < -4 >, the second-order coefficient alpha 2 > 0, the fourth-order coefficient alpha 4 < 0 and the sixth-order coefficient alpha 6 > 0; the clear aperture of the convex surface (S3) of the meniscus lens is 12-16 mm, the curvature radius is 100-1000 mm, the conical coefficient k=0, the second-order coefficient alpha 2 is more than 0, the fourth-order coefficient alpha 4 is more than 0, and the sixth-order coefficient alpha 6 is less than 0; a meniscus lens concave surface (S4), a clear aperture of 12 mm-16 mm, a curvature radius of-500 mm-50 mm, a conical coefficient k=0, a second-order coefficient alpha 2 > 0, a fourth-order coefficient alpha 4 > 0 and a sixth-order coefficient alpha 6 > 0; the distance between the reflector main mirror (S1) and the reflector secondary mirror (S2) is 20-50 mm, the distance between the reflector secondary mirror (S2) and the convex surface (S3) of the meniscus lens is 30-60 mm, the center thickness of the meniscus lens is 2mm, and the distance between the concave surface (S4) of the meniscus lens and the focal plane (S5) is 20-40 mm; the meniscus lens material is fused silica with refractive index nd= 1.45846368692,Abbe Vd = 67.82143343.
2. The catadioptric optical lens of claim 1, wherein: the reflection mirror main mirror (S1) and the reflection mirror sub-mirror (S2) are plated with a protective silver reflection film or a dielectric reflection film for the wave band of 400 nm-700 nm, and the reflectivity is more than 98%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311015494.6A CN116755232B (en) | 2023-08-14 | 2023-08-14 | Catadioptric optical lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311015494.6A CN116755232B (en) | 2023-08-14 | 2023-08-14 | Catadioptric optical lens |
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| Publication Number | Publication Date |
|---|---|
| CN116755232A CN116755232A (en) | 2023-09-15 |
| CN116755232B true CN116755232B (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311015494.6A Active CN116755232B (en) | 2023-08-14 | 2023-08-14 | Catadioptric optical lens |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0051969A1 (en) * | 1980-11-07 | 1982-05-19 | Honeywell Inc. | Field curvature control in optical systems |
| CN102540448A (en) * | 2011-12-27 | 2012-07-04 | 苏州大学 | Optical system for telescope |
| CN102621683A (en) * | 2012-03-15 | 2012-08-01 | 南昌航空大学 | Improved reflective/diffractive hybrid wide field Cassegrain telescope |
| CN104317039A (en) * | 2014-11-11 | 2015-01-28 | 苏州大学 | Reflex type telephoto objective lens |
| CN106990517A (en) * | 2017-05-22 | 2017-07-28 | 凯迈（洛阳）测控有限公司 | A kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system |
| WO2019172694A1 (en) * | 2018-03-07 | 2019-09-12 | 김성수 | Meniscus cassegrain lens |
| CN110850574A (en) * | 2019-12-13 | 2020-02-28 | 成都浩孚科技有限公司 | Large-caliber multiband refraction and reflection front telescope optical system |
| CN110927940A (en) * | 2019-12-19 | 2020-03-27 | 浙江舜宇光学有限公司 | Image pickup apparatus |
| CN111580258A (en) * | 2020-05-29 | 2020-08-25 | 中国科学院西安光学精密机械研究所 | Compact type large-view-field small-F # catadioptric optical system |
-
2023
- 2023-08-14 CN CN202311015494.6A patent/CN116755232B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0051969A1 (en) * | 1980-11-07 | 1982-05-19 | Honeywell Inc. | Field curvature control in optical systems |
| CN102540448A (en) * | 2011-12-27 | 2012-07-04 | 苏州大学 | Optical system for telescope |
| CN102621683A (en) * | 2012-03-15 | 2012-08-01 | 南昌航空大学 | Improved reflective/diffractive hybrid wide field Cassegrain telescope |
| CN104317039A (en) * | 2014-11-11 | 2015-01-28 | 苏州大学 | Reflex type telephoto objective lens |
| CN106990517A (en) * | 2017-05-22 | 2017-07-28 | 凯迈（洛阳）测控有限公司 | A kind of object lens of large relative aperture long-focus uncooled ir is without thermalization optical system |
| WO2019172694A1 (en) * | 2018-03-07 | 2019-09-12 | 김성수 | Meniscus cassegrain lens |
| CN110850574A (en) * | 2019-12-13 | 2020-02-28 | 成都浩孚科技有限公司 | Large-caliber multiband refraction and reflection front telescope optical system |
| CN110927940A (en) * | 2019-12-19 | 2020-03-27 | 浙江舜宇光学有限公司 | Image pickup apparatus |
| CN111580258A (en) * | 2020-05-29 | 2020-08-25 | 中国科学院西安光学精密机械研究所 | Compact type large-view-field small-F # catadioptric optical system |
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| CN116755232A (en) | 2023-09-15 |
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