CN220855316U - Apochromatic long-focus photographic lens - Google Patents
Apochromatic long-focus photographic lens Download PDFInfo
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- CN220855316U CN220855316U CN202322338127.1U CN202322338127U CN220855316U CN 220855316 U CN220855316 U CN 220855316U CN 202322338127 U CN202322338127 U CN 202322338127U CN 220855316 U CN220855316 U CN 220855316U
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- 238000004026 adhesive bonding Methods 0.000 claims abstract description 28
- 230000004075 alteration Effects 0.000 claims abstract description 20
- 238000003384 imaging method Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 206010010071 Coma Diseases 0.000 description 1
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Abstract
The utility model discloses an apochromatic tele photographic lens which comprises a first lens, wherein a first cemented lens group is arranged on one side of the first lens, a second cemented lens group is arranged on one side of the first cemented lens group, the first cemented lens group and the second cemented lens group are used for apochromatic of the lens, a seventh lens and an eighth lens are symmetrically arranged on one side of the second cemented lens group, the seventh lens and the eighth lens are used for balancing axial aberration, the second lens, the third lens and the fourth lens are sequentially arranged, and the second lens, the third lens and the fourth lens are in cemented connection. According to the utility model, the first lens, the first gluing lens group, the second gluing lens group, the seventh lens and the eighth lens are matched, the first gluing lens group and the second gluing lens group realize apochromatic on the basis of achromatism of the lens, the purpose of improving imaging quality is achieved, and the symmetrically arranged seventh lens and eighth lens effectively balance axial aberration.
Description
Technical Field
The utility model relates to the field of photographic lenses, in particular to an apochromatic long-focus photographic lens.
Background
Because the image space aperture angle of the long-focus lens is small, the focal depth of the lens is large, the chromatic aberration tolerance of the lens is large, so that the imaging of the long-focus lens is easy to generate chromatic edges, namely chromatic aberration, and because the chromatic aberration of the long-focus lens with a large aperture is difficult to correct, apochromatic aberration is required, when the lens is apochromatic, a plurality of lenses are required to be installed in a lens barrel and the lens barrel is adjusted Zhang Zhi, thereby causing the defects of heavy lens, large caliber, large chromatic aberration and poor imaging quality of the long-focus photographic lens, and the problem is inconvenient to solve in a lens combination mode.
Disclosure of utility model
The utility model aims to provide an apochromatic tele photographic lens to solve the problems in the background technology.
In order to achieve the above purpose, the present utility model provides the following technical solutions: an apochromatic tele photographic lens comprising:
A first lens, wherein a first gluing lens group is arranged on one side of the first lens, a second gluing lens group is arranged on one side of the first gluing lens group, and the first gluing lens group and the second gluing lens group are used for apochromatic of the lens;
And the seventh lens and the eighth lens are symmetrically arranged on one side of the second gluing lens group and are used for balancing axial aberration.
Preferably, the first cemented lens group includes a second lens, a third lens and a fourth lens, where the second lens, the third lens and the fourth lens are sequentially arranged, and the second lens, the third lens and the fourth lens are cemented.
Preferably, the second cemented lens group includes a fifth lens and a sixth lens, the fifth lens and the sixth lens are sequentially arranged, and the fifth lens and the sixth lens are cemented.
Preferably, a side of the first lens, which faces away from the first cemented lens group, is an object-side convex surface, a side of the first lens, which is close to the first cemented lens group, is an image-side concave surface, a side of the seventh lens, which is opposite to the eighth lens, is a convex surface, and a side of the seventh lens, which is opposite to the eighth lens, is a plane surface and a concave surface, respectively.
Preferably, the sides of the second lens element, the third lens element and the fourth lens element, which are close to the first lens element, are convex surfaces on the object side, and the sides of the second lens element, the third lens element and the fourth lens element, which are close to the second cemented lens group, are concave surfaces on the image side.
Preferably, both sides of the fifth lens are concave surfaces, and both sides of the sixth lens are convex surfaces.
The utility model has the technical effects and advantages that:
according to the utility model, the first lens, the first gluing lens group, the second gluing lens group, the seventh lens and the eighth lens are matched, the first gluing lens group and the second gluing lens group realize apochromatic on the basis of achromatism of the lens, the purpose of improving imaging quality is achieved, and the symmetrically arranged seventh lens and eighth lens effectively balance axial aberration.
Drawings
Fig. 1 is a schematic diagram of the front structure of the present utility model.
Fig. 2 is a schematic diagram of a front structure of a first bonding lens assembly according to the present utility model.
Fig. 3 is a schematic front view of a second glued lens assembly according to the present utility model.
In the figure: 1. a first lens; g1, a first gluing lens group; 2. a second lens; 3. a third lens; 4. a fourth lens; g2, a second gluing lens group; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. and an eighth lens.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The present utility model provides an apochromatic tele-photographing lens as shown in fig. 1-3, comprising:
The lens comprises a first lens 1, a first gluing lens group G1 is arranged on one side of the first lens 1, a second gluing lens group G2 is arranged on one side of the first gluing lens group G1, the first gluing lens group G1 and the second gluing lens group G2 are used for apochromatic aberration of a lens, a seventh lens 7 and an eighth lens 8 are symmetrically arranged on one side of the second gluing lens group G2, the seventh lens 7 and the eighth lens 8 are used for balancing axial aberration, and the axial aberration comprises more than one of spherical aberration, coma aberration and position chromatic aberration.
Specifically, the first cemented lens group G1 includes a second lens 2, a third lens 3, and a fourth lens 4, where the second lens 2, the third lens 3, and the fourth lens 4 are sequentially disposed, and the second lens 2, the third lens 3, and the fourth lens 4 are cemented.
Specifically, the second cemented lens group G2 includes a fifth lens 5 and a sixth lens 6, where the fifth lens 5 and the sixth lens 6 are sequentially arranged, the fifth lens 5 and the sixth lens 6 are cemented and connected, both sides of the fifth lens 5 are concave surfaces, both sides of the sixth lens 6 are convex surfaces, the refractive index of the fifth lens 5 is preferably greater than 1.6, the abbe number is less than 38, the refractive index of the sixth lens 6 is preferably less than 1.5, the abbe number is greater than 55, and chromatic aberration of the optical system is greatly reduced by matching the refractive indexes of materials of the fifth lens 5 and the sixth lens 6 with the abbe number, so that further requirements are satisfied: vd2-Vd1>18, wherein Vd1 and Vd2 are abbe numbers of the fifth lens 5 and the sixth lens 6, respectively, at D light.
Further, one side of the first lens element 1 facing away from the first cemented lens group G1 is a convex object-side surface, one side of the first lens element 1 adjacent to the first cemented lens group G1 is a concave image-side surface, the refractive index of the first lens element 1 is preferably less than 1.6, the abbe number is greater than 50, one side of the seventh lens element 7 opposite to the eighth lens element 8 is a convex surface, the opposite sides of the seventh lens element 7 and the eighth lens element 8 are respectively a flat surface and a concave surface, the refractive index of the seventh lens element 7 is preferably less than 1.6, the abbe number is greater than 60, the refractive index of the eighth lens element 8 is preferably less than 1.6, and the abbe number is greater than 60.
Further, the sides of the second lens 2, the third lens 3 and the fourth lens 4 close to the first lens 1 are all object-side convex surfaces, the sides of the second lens 2, the third lens 3 and the fourth lens 4 close to the second cemented lens group G2 are all image-side concave surfaces, the refractive index of the second lens 2 is preferably larger than 1.6, the abbe number is smaller than 38, the refractive index of the third lens 3 is preferably smaller than 1.5, the abbe number is larger than 55, the refractive index of the fourth lens 4 is preferably larger than 1.6, the abbe number is smaller than 35, the second lens 2 and the fourth lens 4 are crown lenses, the third lens 3 is flint lenses, so that the second lens 2, the third lens 3 and the fourth lens 4 can be used for apodizing F light, C light and D light, the F light, the C light and the D light are corrected to be zero in a certain band, the chromatic aberration of a second order is greatly reduced by matching the refractive index of the materials of the second lens 2, the third lens 3 and the fourth lens 4 with the abbe more than 1.6, the chromatic aberration of an optical system is greatly reduced, and the reduction of the required chromatic aberration is achieved.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present utility model, and although the present utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present utility model.
Claims (6)
1. An apochromatic tele photographic lens, comprising:
A first lens (1), wherein a first gluing lens group (G1) is arranged on one side of the first lens (1), a second gluing lens group (G2) is arranged on one side of the first gluing lens group (G1), and the first gluing lens group (G1) and the second gluing lens group (G2) are used for lens apochromatic;
A seventh lens (7) and an eighth lens (8), wherein the seventh lens (7) and the eighth lens (8) are symmetrically arranged on one side of the second gluing lens group (G2), and the seventh lens (7) and the eighth lens (8) are used for balancing axial aberration.
2. The apochromatic tele photographing lens according to claim 1, wherein the first cemented lens group (G1) comprises a second lens (2), a third lens (3) and a fourth lens (4), the second lens (2), the third lens (3) and the fourth lens (4) are sequentially arranged, and the second lens (2), the third lens (3) and the fourth lens (4) are cemented.
3. The apochromatic tele photographing lens according to claim 1, wherein the second cemented lens group (G2) comprises a fifth lens (5) and a sixth lens (6), the fifth lens (5) and the sixth lens (6) being sequentially arranged, and the fifth lens (5) and the sixth lens (6) being cemented.
4. The apochromatic tele photographing lens according to claim 1, wherein one side of the first lens (1) facing away from the first cemented lens group (G1) is an object-side convex surface, one side of the first lens (1) close to the first cemented lens group (G1) is an image-side concave surface, one side of the seventh lens (7) opposite to the eighth lens (8) is a convex surface, and one side of the seventh lens (7) opposite to the eighth lens (8) is a plane surface and a concave surface, respectively.
5. The apochromatic tele-photographing lens according to claim 2, wherein the sides of the second lens (2), the third lens (3) and the fourth lens (4) close to the first lens (1) are all convex surfaces on the object side, and the sides of the second lens (2), the third lens (3) and the fourth lens (4) close to the second cemented lens group (G2) are all concave surfaces on the image side.
6. An apochromatic tele-photographing lens according to claim 3, characterized in that both sides of the fifth lens (5) are concave and both sides of the sixth lens (6) are convex.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322338127.1U CN220855316U (en) | 2023-08-30 | 2023-08-30 | Apochromatic long-focus photographic lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322338127.1U CN220855316U (en) | 2023-08-30 | 2023-08-30 | Apochromatic long-focus photographic lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220855316U true CN220855316U (en) | 2024-04-26 |
Family
ID=90772892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322338127.1U Active CN220855316U (en) | 2023-08-30 | 2023-08-30 | Apochromatic long-focus photographic lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220855316U (en) |
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2023
- 2023-08-30 CN CN202322338127.1U patent/CN220855316U/en active Active
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