CN1365014A - Maksutov telescope - Google Patents
Maksutov telescope Download PDFInfo
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- CN1365014A CN1365014A CN 01101222 CN01101222A CN1365014A CN 1365014 A CN1365014 A CN 1365014A CN 01101222 CN01101222 CN 01101222 CN 01101222 A CN01101222 A CN 01101222A CN 1365014 A CN1365014 A CN 1365014A
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- maksutov
- telescope
- aberration
- meniscus lens
- maksutov telescope
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Abstract
The Maksutov telescope of the present invention has separate secondary mirror and meniscus lens and thus two factors of correcting aberration. Therefore, compared with available Maksutov telescope, the present one has reduced aberration, especially spherical aberration and point aberration.
Description
The present invention relates to a kind of Maksutov telescope.
Existing Maksutov telescope, it constitutes shown in the image of Fig. 1.The concave surface of thick meniscus lens 1 is towards incident ray one side, at its rear configuration concave surface primary mirror 3.A part of minute surface of the protruding side of thick meniscus lens 1 is implemented vacuum evaporation, to form secondary mirror 2.Incident ray is injected from the concave surface of thick meniscus lens 1, and the imaging on the focal plane 4 at focus f place by secondary mirror 2 and primary mirror 3.Adopt this form, reducing aberration can only carry out from material, radius-of-curvature and the meniscus lens of meniscus lens and the aspects such as distance of primary mirror.Therefore, the degree of freedom of rectification aberration is little.Thereby cause spherical aberration to be the state of heaving, as shown in Figure 2.Therefore and cause imago and peripheral picture the in the visual field of an image pattern, shown in Fig. 3 a-3d into disperse state.
Therefore, the objective of the invention is to reduce described aberration, a kind of novel Maksutov telescope is provided.
Because in existing Maksutov telescope, under the condition of having determined meniscus lens and primary mirror distance, even change radius-of-curvature etc. influence the factor of aberration, reducing of aberration is also very limited.If further correct aberration, appending variable key element is best bet.The present invention provides a kind of improved Maksutov telescope as starting point.
The basic structure of described Maksutov telescope is identical with the basic structure of Maksutov telescope of the prior art, it is characterized in that, in this Maksutov telescope, secondary mirror separates with meniscus lens.
In addition, in described Maksutov telescope, described secondary mirror can have the radius-of-curvature different with the radius-of-curvature of meniscus lens.
Also have, in described Maksutov telescope, the distance of primary mirror to the distance of described secondary mirror and this primary mirror to described meniscus lens can be different.
Because secondary mirror separates with meniscus lens, so increased by two factors of correcting aberration.Therefore, compare with Maksutov telescope of the prior art, can be according to Maksutov telescope of the present invention aberration, particularly spherical aberration is reduced to about below 1/10 with the some image pattern.
Below in conjunction with accompanying drawing, by way of example, to being described in detail according to a preferred embodiment of the present invention, wherein,
Fig. 1 is the image of Maksutov telescope in the prior art;
Fig. 2 is the spherical aberration figure of Maksutov telescope in the prior art;
Fig. 3 (a)-3 (d) is the some image pattern of Maksutov telescope in the prior art;
Fig. 4 is the image according to Maksutov telescope of the present invention;
Fig. 5 is the spherical aberration figure according to Maksutov telescope of the present invention;
Fig. 6 (a)-6 (d) is the some image pattern according to Maksutov telescope of the present invention;
With reference to Fig. 1, the image of Maksutov telescope in its expression prior art, wherein label a, c, b represent respectively typically by the upper and lower edge of meniscus lens 1 and three incident raies of optical axis.Secondary mirror 2 is by enforcement vacuum evaporation, in the protruding side formation of meniscus lens, so in fact, this secondary mirror 2 forms an integral body with meniscus lens 1.Because 1 one-tenth whole setting of secondary mirror 2 and meniscus lens is so the degree of freedom of rectification aberration is very little.The concrete parameter of diagram Maksutov telescope is as shown in the table.
The FNo.=12.971 image distance is from=326.507 sequence number R (mm) spacing glass title diameters
(mm) (mm)
0.000 0.000 AIR 100.000 1′ -120.575 17.897 BK7 102.000 1″ -131.155 179.890 AIR 106.000 3′ -454.611 -179.890 -AIR 109.000 2′ -131.155 325.750 AIR 27.000
0.000 0.000 AIR 100.000
Wherein, FNO.=f/D, f are focal length, and D is an aperture of objective lens; Sequence number 1 ', 1 ", 3 ', 2 ' respectively represent each lens face, as shown in Figure 1.R represents radius-of-curvature; Spacing is represented the spacing between glass, promptly be respectively 1 ' face to 1 " face apart from 17.897mm, 1 " face to 3 ' face apart from the distance-179.890mm of 179.890mm, 3 ' face to 2 ' face and 2 ' face to focus apart from 325.750mm.The glass title is represented the title of employed glass.Diameter is represented the bore of each lens.
Fig. 2 and Fig. 3 (a)-3 (d) have represented the spherical aberration figure of above-mentioned Maksutov telescope respectively and have put image pattern.In Fig. 2, curve c is corresponding to wavelength 656nm; Curve d is corresponding to wavelength 587nm; Curve e is corresponding to wavelength 546nm; Curve F is corresponding to wavelength 486nm; Curve g is corresponding to wavelength 436nm.As can be seen from the figure, spherical aberration is bigger in the Maksutov telescope of prior art, is the state of heaving.And imago looks like into disperse state with periphery in the visual field, shown in Fig. 3 (a), 3 (b), 3 (c), 3 (d), and the some image pattern when it is illustrated respectively in 0.000 °, 0.500 °, 0.750 ° and 1.000 ° of incident angles; Wherein, the unit distance of horizontal ordinate is 0.01mm.
Fig. 4 represents that according to Maksutov telescope of the present invention label a, c, b represent respectively typically by the upper and lower edge of meniscus lens 1 and three incident raies of optical axis; Wherein with Fig. 1 in identical parts represent with identical reference number.Maksutov telescope of the present invention has the basic structure identical with Maksutov telescope of the prior art.
In Maksutov telescope according to the present invention, as shown in Figure 4, secondary mirror 2 is separated from each other, becomes two parts settings with meniscus lens 1, and is arranged on and leaves primary mirror 3 a distance.By described Maksutov telescope, in the focal plane 4 at focus f place, formed distinct image.
Because secondary mirror 2 separates with meniscus lens 1, so except that can be by adjusting meniscus lens 1 and secondary mirror 2 to the distance of primary mirror 3 is adjusted aberration, particularly spherical aberration, can also be by adjusting the radius-of-curvature of meniscus lens 1 and secondary mirror 2 respectively, and secondary mirror 2 is adjusted aberration with respect to the distance of meniscus lens 1 and primary mirror 3.This has increased the factor of regulating aberration, thereby can reduce aberration significantly by adjusting a plurality of factors that influence aberration.The concrete parameter of diagram Maksutov telescope is as shown in the table.
The FNo.=11.459 image distance is from=376.824 sequence number R (mm) spacing glass title diameters
(mm) (mm)
0.000 0.000 AIR 100.000 1′ -133.569 6.800 BK7 102.400 1″ -137.448 233.331 AIR 102.400 3′ -660.655 -227.776 -AIR 104.000 2′ -299.997 376.724 AIR 33.000
0.000 0.000 AIR 100.000
Wherein, FNO.=f/D, f are focal length, and D is an aperture of objective lens; Sequence number 1 ', 1 ", 3 ', 2 ' respectively represent each lens face .R represents radius-of-curvature as shown in Figure 1; Spacing is represented the spacing between glass, promptly is respectively 1 ' face to 1 " distance 6.800,1 of the face " distance 233.331 of face to 3 ' face, the distance-227.776 of 3 ' face to 2 ' face and the 2 ' face distance 376.724 to focus.The glass title is represented the title of employed glass.Diameter is represented the bore of each lens.
Spherical aberration figure of the present invention as shown in Figure 5, wherein curve c is corresponding to wavelength 656nm; Curve d is corresponding to wavelength 587nm; Curve e is corresponding to wavelength 546nm; Curve F is corresponding to wavelength 486nm; Curve g is corresponding to wavelength 436nm.Obviously, compare with the Maksutov telescope of above-mentioned prior art, the spherical aberration of Maksutov telescope of the present invention reduces significantly, and image quality improves significantly.
The unit distance of horizontal ordinate is 0.01mm among Fig. 6 (a), 6 (b), 6 (c), 6 (d), the some image pattern when it is illustrated respectively in 0.000 °, 0.500 °, 0.750 ° and 1.000 ° of incident angles; From of the present invention some image pattern shown in it as can be seen, in Maksutov telescope of the present invention, in the visual field imago and periphery picture with respect to imago in the visual field of the Maksutov telescope of prior art and periphery picture significantly to centre convergence, therefore imaging is more clear, has improved image quality greatly.
As for concrete structure of the present invention, under the prerequisite that does not break away from above-mentioned spirit, various improvement can be arranged, all in the claimed scope of claims of the present invention.
Claims (3)
1. a Maksutov telescope is characterized in that, the secondary mirror of described Maksutov telescope separates with meniscus lens.
2. a kind of Maksutov telescope according to claim 1 is characterized in that, the radius-of-curvature of described secondary mirror is different with the radius-of-curvature of described meniscus lens.
3. according to claim 1 or 2 described a kind of Maksutov telescopes, it is characterized in that in described Maksutov telescope, primary mirror is different to the distance of described meniscus lens with this primary mirror to the distance of described secondary mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01101222 CN1365014A (en) | 2001-01-09 | 2001-01-09 | Maksutov telescope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01101222 CN1365014A (en) | 2001-01-09 | 2001-01-09 | Maksutov telescope |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1365014A true CN1365014A (en) | 2002-08-21 |
Family
ID=4651996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01101222 Pending CN1365014A (en) | 2001-01-09 | 2001-01-09 | Maksutov telescope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1365014A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802996A (en) * | 2018-06-08 | 2018-11-13 | 中国科学院紫金山天文台 | A kind of three mirror optical systems of big visual field Survey telescope |
-
2001
- 2001-01-09 CN CN 01101222 patent/CN1365014A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108802996A (en) * | 2018-06-08 | 2018-11-13 | 中国科学院紫金山天文台 | A kind of three mirror optical systems of big visual field Survey telescope |
| CN108802996B (en) * | 2018-06-08 | 2020-11-03 | 中国科学院紫金山天文台 | Three-mirror optical system of large-view-field telescope |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |