CN209979920U - Fisheye lens - Google Patents
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- CN209979920U CN209979920U CN201921080200.7U CN201921080200U CN209979920U CN 209979920 U CN209979920 U CN 209979920U CN 201921080200 U CN201921080200 U CN 201921080200U CN 209979920 U CN209979920 U CN 209979920U
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Abstract
The utility model relates to a camera lens technical field relates to a fisheye camera lens especially. The utility model discloses a fish-eye lens, which comprises a first lens to an eighth lens from an object side to an image side along an optical axis in sequence; the first lens is a convex-concave lens with negative refractive index; the second lens is a convex-concave lens with negative refractive index; the third lens has a convex-concave lens with negative refractive index; the fourth lens is a convex lens with positive refractive index; the fifth lens is a concave-convex lens with positive refractive index; the sixth lens is a concave-convex lens with negative refractive index; the seventh lens is a convex lens with positive refractive index; the eighth lens is a concave-convex lens with negative refractive index; the fifth lens and the sixth lens are cemented to each other, and the seventh lens and the eighth lens are cemented to each other. The utility model has the advantages of image surface is big, and resolution ratio is high, and the resolving power degree of consistency is good, and the aberration is little, and the imaging quality is good, and the contrast is high, avoids the periphery to have more obvious round halo.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to a fisheye camera lens.
Background
The fisheye lens is an ultra-wide angle lens having a focal length of 16mm or less. The front lens of the lens is large in diameter and is in a parabolic shape, protrudes towards the front of the lens, is quite similar to the fish eye, and is commonly called as a fish eye lens. The existing fisheye lens is widely applied to the fields of security monitoring, vehicle-mounted monitoring and the like, so that the requirement on the fisheye lens is higher and higher, but the image surface of the existing fisheye lens is smaller and smaller than 7 mm; the pixels are not high, the difference of resolving power from the center to the edge is very large, and the uniformity is poor; the difficulty of aberration correction is large, especially at the edges; at a large angle, the illumination is low, the image quality is reduced sharply, and a circle of halation is arranged at the periphery of the lens, so that the increasingly higher requirements cannot be met.
Disclosure of Invention
An object of the utility model is to provide a fisheye lens is used for solving the technical problem that above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: a fisheye lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from an object side to an image side in sequence along an optical axis; the first lens element to the eighth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the fifth lens is mutually glued with the object side surface of the sixth lens;
the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the seventh lens is mutually glued with the object side surface of the eighth lens;
the fisheye lens has only eight lenses with refractive indexes.
Further, the optical diaphragm is arranged between the fourth lens and the fifth lens.
Further, the fisheye lens further satisfies: D12/R12 is less than 1.82, wherein D12 is the clear aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.
Further, the fisheye lens also satisfies: nd1 > 1.9, where nd1 is the refractive index of the first lens at the d-line.
Further, the fisheye lens further satisfies: nd4 is more than or equal to 1.70, wherein nd4 is the refractive index of the fourth lens at the d line.
Further, the fisheye lens further satisfies: vd7 is more than or equal to 70, vd8 is less than or equal to 30, and vd7-vd8 is more than 30, wherein vd7 and vd8 respectively represent the dispersion coefficients of the seventh lens and the eighth lens at the d line.
Further, the fisheye lens further satisfies: ALT <14.6mm, wherein ALT is a sum of eight lens thicknesses of the first lens to the eighth lens on the optical axis.
Further, the fisheye lens further satisfies: ALG <19.43mm, where ALG is the sum of the air gaps on the optical axis from the first lens to the imaging surface.
Further, the fisheye lens further satisfies: ALT/ALG <2, wherein ALG is the sum of air gaps between the first lens and an image plane on the optical axis, and ALT is the sum of eight lens thicknesses between the first lens and the eighth lens on the optical axis.
The utility model has the advantages of:
the utility model adopts eight lenses, and has a large image plane (which can be larger than 8.8mm) by correspondingly designing each lens; the resolution is high (can reach 180lp/mm & gt 0.3), and the uniformity from the center to the edge is high; the vertical axis aberration is very small (can be less than 10 μm); and the advantage that a circle of halation is more obvious at the periphery is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF of visible light 0.4350-0.6560 μm according to a first embodiment of the present invention;
fig. 3 is a vertical axis aberration curve diagram according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a contrast curve according to a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 6 is a graph of MTF of visible light 0.4350-0.6560 μm according to example II of the present invention;
fig. 7 is a vertical axis aberration graph according to the second embodiment of the present invention;
fig. 8 is a schematic diagram of a contrast curve according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 10 is a graph of MTF of visible light 0.4350-0.6560 μm according to a third embodiment of the present invention;
fig. 11 is a vertical axis aberration graph according to a third embodiment of the present invention;
fig. 12 is a schematic diagram of a contrast curve according to a third embodiment of the present invention;
fig. 13 is a table of values of relevant important parameters according to three embodiments of the present invention.
Detailed Description
To further illustrate the embodiments, the present invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The utility model discloses a fish-eye lens, which comprises a first lens to an eighth lens from an object side to an image side along an optical axis in sequence; the first lens element to the eighth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
The first lens element with negative refractive index has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface; the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface; the second lens and the third lens are the same as the first lens in shape and have negative refractive indexes, so that a large angle is ensured, the outer diameter of the first lens is compressed, and the image quality is optimized.
The fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the fifth lens element with positive refractive index has a concave object-side surface and a convex image-side surface; the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the fifth lens is mutually glued with the object side surface of the sixth lens; the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the seventh lens is mutually glued with the object side surface of the eighth lens; the fisheye lens has only eight lenses with refractive indexes.
The utility model adopts eight lenses, and has large image surface by correspondingly designing each lens; the resolution is high, and the center-to-edge uniformity is high; the aberration of the vertical axis is extremely small; and the advantage that a circle of halation is more obvious at the periphery is avoided.
Preferably, the lens further comprises a diaphragm, wherein the diaphragm is arranged between the fourth lens and the fifth lens, so that the overall light rays are relatively flat, and the tolerance and manufacturability are strong.
Preferably, the fisheye lens further satisfies: D12/R12 is less than 1.82, wherein D12 is the clear aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens, so that the processing is convenient.
More preferably, the fisheye lens further satisfies: nd1 is more than 1.9, wherein nd1 is the refractive index of the first lens at the d line, the first lens adopts a high-refractive-index material, and the outer diameter of the first lens is further compressed while a large angle is ensured.
Preferably, the fisheye lens further satisfies: nd4 is more than or equal to 1.70, wherein nd4 is the refractive index of the fourth lens at the d line, and the system performance is better improved and the aberration is corrected by matching with a biconvex structure of the fourth lens.
Preferably, the fisheye lens further satisfies: vd7 is more than or equal to 70, vd8 is less than or equal to 30, and vd7-vd8 is more than 30, wherein vd7 and vd8 respectively represent the dispersion coefficients of the seventh lens and the eighth lens on the d line, and high-low dispersion materials are combined to effectively control chromatic aberration, optimize image quality and improve system performance.
Preferably, the fisheye lens further satisfies: ALT <14.6mm, wherein ALT is the total thickness of eight lenses of the first lens to the eighth lens on the optical axis, so as to further shorten the system length of the fish-eye lens, and the fish-eye lens is easy to manufacture and optimize the system configuration.
Preferably, the fisheye lens further satisfies: ALG <19.43mm, wherein ALG is the sum of air gaps between the first lens and an imaging surface on the optical axis, so that the system length of the fisheye lens is further shortened, the fisheye lens is easy to process and manufacture, and the system configuration is optimized.
Preferably, the fisheye lens further satisfies: ALT/ALG <2, wherein ALG is the sum of air gaps between the first lens and an imaging surface on the optical axis, and ALT is the sum of thicknesses of eight lenses between the first lens and the eighth lens on the optical axis, so that the system length of the fisheye lens is further shortened, the fisheye lens is easy to process and manufacture, and the system configuration is optimized.
The following describes the fisheye lens of the present invention in detail with specific embodiments.
As shown in fig. 1, a fisheye lens includes, in order along an optical axis I, a first lens 1 to a fourth lens 4, a stop 9, a fifth lens 5 to an eighth lens 8, a filter 100, a protective glass 110, and an image plane 120 from an object side a1 to an image side a 2; the first lens element 1 to the eighth lens element 8 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
The first lens element 1 has a negative refractive index, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a negative refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is concave.
The fourth lens element 4 has a positive refractive index, and an object-side surface 41 of the fourth lens element 4 is convex and an image-side surface 42 of the fourth lens element 4 is convex.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is concave and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 with negative refractive index has a concave object-side surface 61 of the sixth lens element 6 and a convex image-side surface 62 of the sixth lens element 6; the image-side surface 52 of the fifth lens element 5 and the object-side surface 61 of the sixth lens element 6 are cemented to each other.
The seventh lens element 7 has a positive refractive index, and an object-side surface 71 of the seventh lens element 7 is convex and an image-side surface 72 of the seventh lens element 7 is convex.
The eighth lens element 8 with negative refractive index has a concave object-side surface 81 of the eighth lens element 8 and a convex image-side surface 82 of the eighth lens element 8; the image-side surface 72 of the seven lens element 7 and the object-side surface 81 of the eighth lens element 8 are cemented to each other.
In this embodiment, the filter 100 is an infrared filter, but is not limited thereto.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
| Surface of | Caliber size (mm) | Radius of curvature (mm) | Thickness (mm) | Material of | Refractive index | Coefficient of dispersion | Focal length (mm) | ||
| - | Shot object | Infinity | Infinity | ||||||
| 11 | First lens | 22.000 | 16.585 | 1.547 | TAFD37 | 1.900433 | 37.3706 | -14.39 | |
| 12 | 12.694 | 6.977 | 3.696 | ||||||
| 21 | Second lens | 14.000 | 33.133 | 0.798 | H-ZK21 | 1.622995 | 58.1542 | -8.19 | |
| 22 | 7.844 | 4.397 | 2.371 | ||||||
| 31 | Third lens | 10.000 | 25.619 | 1.000 | H-ZPK2A | 1.603001 | 65.4596 | -14.60 | |
| 32 | 6.687 | 6.473 | 3.423 | ||||||
| 41 | Fourth lens | 8.000 | 6.263 | 3.166 | H-ZF5 | 1.740005 | 28.2915 | 7.75 | |
| 42 | 8.000 | -58.922 | 1.028 | ||||||
| 9 | Diaphragm | 3.234 | Infinity | 0.986 | |||||
| 51 | Fifth lens element | 5.000 | -49.504 | 2.272 | H-BAF5 | 1.605624 | 43.8806 | 4.91 | |
| 52 | 5.000 | -2.870 | 0 | ||||||
| 61 | Sixth lens element | 5.000 | -2.870 | 1.687 | E-FDS1-W | 1.922860 | 20.8804 | -7.13 | |
| 62 | 8.500 | -6.480 | 1.632 | ||||||
| 71 | Seventh lens element | 7.000 | 10.579 | 2.674 | FCD705 | 1.550323 | 75.4963 | 7.51 | |
| 72 | 7.000 | -6.199 | 0 | ||||||
| 81 | Eighth lens element | 7.000 | -6.199 | 1.310 | H-ZF52GT | 1.846666 | 23.7873 | -15.77 | |
| 82 | 8.500 | -12.592 | 2.487 | ||||||
| 100 | Optical filter | 8.017 | Infinity | 0.300 | H-K9L | 1.516802 | 64.2306 | Infinity | |
| - | 8.053 | Infinity | 1.000 | ||||||
| 110 | Cover glass | 8.236 | Infinity | 0.500 | H-K9L | 1.516802 | 64.2306 | Infinity | |
| - | 8.297 | Infinity | 2.801 | ||||||
| 120 | Image plane | - | Infinity |
Please refer to fig. 13 for the values of the conditional expressions related to this embodiment.
Referring to FIG. 2, the MTF curve of the present embodiment can be seen to have a high transfer function and a high resolution, which can reach 180lp/mm > 0.3; referring to fig. 3, the vertical axis aberration is very small and less than < 10 μm, and the graph of the relative illuminance is schematically illustrated in fig. 4, where the angle of view of the fisheye lens is 180 ° and the relative illuminance is greater than 60%.
In this embodiment, the focal length f of the fisheye lens is 2.9mm, the aperture value FNO is 2.8, the field angle FOV is 180 °, the image plane Φ is 8.8mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the image plane 120 on the optical axis I is 34.68 mm.
Example two
As shown in fig. 5, in this embodiment, the surface-type convexo-concave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
| Surface of | Caliber size (mm) | Radius of curvature (mm) | Thickness (mm) | Material of | Refractive index | Coefficient of dispersion | Focal length (mm) | ||
| - | Shot object | Infinity | Infinity | ||||||
| 11 | First lens | 22.000 | 16.704 | 1.635 | TAFD37 | 1.900433 | 37.3706 | -14.42 | |
| 12 | 12.629 | 6.990 | 3.598 | ||||||
| 21 | Second lens | 14.000 | 33.871 | 0.801 | H-ZK21 | 1.622995 | 58.1542 | -8.18 | |
| 22 | 7.840 | 4.407 | 2.358 | ||||||
| 31 | Third lens | 10.000 | 26.237 | 1.001 | H-ZPK2A | 1.603001 | 65.4596 | -14.59 | |
| 32 | 6.677 | 6.511 | 3.417 | ||||||
| 41 | Fourth lens | 8.000 | 6.272 | 3.100 | H-ZF5 | 1.740005 | 28.2915 | 7.75 | |
| 42 | 8.000 | -58.392 | 1.022 | ||||||
| 9 | Diaphragm | 3.200 | Infinity | 1.013 | |||||
| 51 | Fifth lens element | 5.000 | -50.262 | 2.300 | H-BAF5 | 1.605624 | 43.8806 | 4.90 | |
| 52 | 5.000 | -2.867 | 0 | ||||||
| 61 | Sixth lens element | 5.000 | -2.867 | 1.738 | E-FDS1-W | 1.922860 | 20.8804 | -7.17 | |
| 62 | 8.500 | -6.481 | 1.667 | ||||||
| 71 | Seventh lens element | 7.000 | 10.563 | 2.649 | FCD705 | 1.550323 | 75.4963 | 7.49 | |
| 72 | 7.000 | -6.185 | 0 | ||||||
| 81 | Eighth lens element | 7.000 | -6.185 | 1.355 | H-ZF52GT | 1.846666 | 23.7873 | -15.82 | |
| 82 | 8.500 | -12.545 | 2.478 | ||||||
| 100 | Optical filter | 8.092 | Infinity | 0.300 | H-K9L | 1.516802 | 64.2306 | Infinity | |
| - | 8.125 | Infinity | 1.000 | ||||||
| 110 | Cover glass | 8.293 | Infinity | 0.500 | H-K9L | 1.516802 | 64.2306 | Infinity | |
| - | 8.348 | Infinity | 2.792 | ||||||
| 120 | Image plane | - | Infinity |
Please refer to fig. 13 for the values of the conditional expressions related to this embodiment.
Referring to FIG. 6, the MTF curve of the present embodiment can be seen to have a high transfer function and a high resolution, which can reach 180lp/mm > 0.3; referring to fig. 7, the vertical axis aberration is very small and less than < 10 μm, and the graph of the relative illuminance is schematically illustrated in fig. 8, the angle of view of the fisheye lens is 180 °, and the relative illuminance is greater than 60%.
In the present embodiment, the focal length f of the fisheye lens is 2.95mm, the aperture value FNO is 2.81, the field angle FOV is 180 °, the image plane Φ is 8.8mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the image plane 120 on the optical axis I is 34.72 mm.
EXAMPLE III
As shown in fig. 9, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
| Surface of | Caliber size (mm) | Radius of curvature (mm) | Thickness (mm) | Material of | Refractive index | Coefficient of dispersion | Focal length (mm) | ||
| - | Shot object | Infinity | Infinity | ||||||
| 11 | First lens | 22.000 | 16.781 | 1.607 | TAFD37 | 1.900433 | 37.3706 | -14.43 | |
| 12 | 12.652 | 7.015 | 3.596 | ||||||
| 21 | Second lens | 14.000 | 33.542 | 0.800 | H-ZK21 | 1.622995 | 58.1542 | -8.19 | |
| 22 | 7.839 | 4.405 | 2.357 | ||||||
| 31 | Third lens | 10.000 | 26.226 | 1.000 | H-ZPK2A | 1.603001 | 65.4596 | -14.56 | |
| 32 | 6.680 | 6.502 | 3.419 | ||||||
| 41 | Fourth lens | 8.000 | 6.275 | 3.062 | H-ZF5 | 1.740005 | 28.2915 | 7.75 | |
| 42 | 8.000 | -58.230 | 1.026 | ||||||
| 9 | Diaphragm | 3.243 | Infinity | 1.033 | |||||
| 51 | Fifth lens element | 5.000 | -49.751 | 2.300 | H-BAF5 | 1.605624 | 43.8806 | 4.91 | |
| 52 | 5.000 | -2.868 | 0 | ||||||
| 61 | Sixth lens element | 5.000 | -2.868 | 1.731 | E-FDS1-W | 1.922860 | 20.8804 | -7.17 | |
| 62 | 8.500 | -6.481 | 1.667 | ||||||
| 71 | Seventh lens element | 7.000 | 10.561 | 2.656 | FCD705 | 1.550323 | 75.4963 | 7.49 | |
| 72 | 7.000 | -6.190 | 0 | ||||||
| 81 | Eighth lens element | 7.000 | -6.190 | 1.349 | H-ZF52GT | 1.846666 | 23.7873 | -15.80 | |
| 82 | 8.500 | -12.569 | 2.482 | ||||||
| 100 | Optical filter | 8.100 | Infinity | 0.300 | H-K9L | 1.516802 | 64.2306 | Infinity | |
| - | 8.133 | Infinity | 1.000 | ||||||
| 110 | Cover glass | 8.298 | Infinity | 0.500 | H-K9L | 1.516802 | 64.2306 | Infinity | |
| - | 8.353 | Infinity | 2.796 | ||||||
| 120 |
Please refer to fig. 13 for the values of the conditional expressions related to this embodiment.
Referring to FIG. 10, the MTF curve of the present embodiment can be seen to have a high transfer function and a high resolution, which can reach 180lp/mm > 0.3; referring to fig. 11, the vertical axis aberration is very small and less than < 10 μm, and the graph of the relative illuminance is schematically illustrated in fig. 12, the angle of view of the fisheye lens is 180 °, and the relative illuminance is greater than 60%.
In this embodiment, the focal length f of the fisheye lens is 2.95mm, the aperture value FNO is 2.78, the field angle FOV is 180 °, the image plane Φ is 8.8mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the image plane 120 on the optical axis I is 34.68 mm.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A fisheye lens characterized in that: the optical lens assembly sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side along an optical axis; the first lens element to the eighth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the second lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the fifth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the sixth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the fifth lens is mutually glued with the object side surface of the sixth lens;
the seventh lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the eighth lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the seventh lens is mutually glued with the object side surface of the eighth lens;
the fisheye lens has only eight lenses with refractive indexes.
2. The fisheye lens of claim 1, wherein: and the diaphragm is arranged between the fourth lens and the fifth lens.
3. The fisheye lens of claim 1, further satisfying: D12/R12 is less than 1.82, wherein D12 is the clear aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.
4. The fisheye lens of claim 3, further satisfying: nd1 > 1.9, where nd1 is the refractive index of the first lens at the d-line.
5. The fisheye lens of claim 1, further satisfying: nd4 is more than or equal to 1.70, wherein nd4 is the refractive index of the fourth lens at the d line.
6. The fisheye lens of claim 1, further satisfying: vd7 is more than or equal to 70, vd8 is less than or equal to 30, and vd7-vd8 is more than 30, wherein vd7 and vd8 respectively represent the dispersion coefficients of the seventh lens and the eighth lens at the d line.
7. The fisheye lens of claim 1, further satisfying: ALT <14.6mm, wherein ALT is a sum of eight lens thicknesses of the first lens to the eighth lens on the optical axis.
8. The fisheye lens of claim 1, further satisfying: ALG <19.43mm, where ALG is the sum of the air gaps on the optical axis from the first lens to the imaging surface.
9. The fisheye lens of claim 1, further satisfying: ALT/ALG <2, wherein ALG is the sum of air gaps between the first lens and an image plane on the optical axis, and ALT is the sum of eight lens thicknesses between the first lens and the eighth lens on the optical axis.
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| CN201921080200.7U CN209979920U (en) | 2019-07-11 | 2019-07-11 | Fisheye lens |
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| CN201921080200.7U CN209979920U (en) | 2019-07-11 | 2019-07-11 | Fisheye lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285911A (en) * | 2020-09-29 | 2021-01-29 | 江西联创电子有限公司 | Super wide-angle lens and imaging device |
| CN113504627A (en) * | 2021-06-02 | 2021-10-15 | 北京空间机电研究所 | Compact ultraviolet optical system with same material, large view field and small F number |
-
2019
- 2019-07-11 CN CN201921080200.7U patent/CN209979920U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112285911A (en) * | 2020-09-29 | 2021-01-29 | 江西联创电子有限公司 | Super wide-angle lens and imaging device |
| CN113504627A (en) * | 2021-06-02 | 2021-10-15 | 北京空间机电研究所 | Compact ultraviolet optical system with same material, large view field and small F number |
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