CN211478749U - Fish-eye lens for day and night use - Google Patents
Fish-eye lens for day and night use Download PDFInfo
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- CN211478749U CN211478749U CN202020392844.6U CN202020392844U CN211478749U CN 211478749 U CN211478749 U CN 211478749U CN 202020392844 U CN202020392844 U CN 202020392844U CN 211478749 U CN211478749 U CN 211478749U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses a fish-eye lens for day and night use, which comprises a first lens to a ninth lens from an object side to an image side along an optical axis in sequence; the first lens and the second lens are both convex-concave lenses with negative refractive index; the third lens element with negative refractive index has a convex image-side surface; the fourth lens and the seventh lens are concave lenses with negative refractive index; the fifth lens element, the eighth lens element and the ninth lens element are convex lenses with positive refractive index; the sixth lens is a concave-convex lens with positive refractive index; the third lens and the fourth lens are cemented to each other, and the seventh lens and the eighth lens are cemented to each other. The utility model has a large field angle; high resolution, high image quality; the color difference is small, and the purple fringing control is good; good day and night confocality.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to a wide field angle, dual-purpose fisheye lens of day night.
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.
At present, the fisheye lens is widely applied to the fields of security monitoring, vehicle monitoring, video conferencing and the like, and therefore, the requirement on the fisheye lens is higher and higher. For the fish-eye lens applied to the fields of security monitoring and the like, the requirement on the day and night (visible light and infrared) confocal performance is higher because the fish-eye lens needs to be shared in the day and night, but the conventional fish-eye lens has poor day and night confocal performance or has no day and night confocal function, and cannot be used in the day and night; in addition, the conventional fisheye lens has some defects, such as small field angle and 180-degree visual field range; the edge resolution is low, so that poor image quality and edge blurring are caused; the edge color difference is large, the purple fringing phenomenon is serious, and the like, and the increasingly improved requirements cannot be met, so that the improvement is urgently needed.
Disclosure of Invention
An object of the utility model is to provide a dual-purpose fisheye lens of day night 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 fish-eye lens for day and night use 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 along an optical axis; the first lens element to the ninth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
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 image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the third lens and the fourth lens are mutually cemented, and the seventh lens and the eighth lens are mutually cemented;
the lens with the refractive index of the fisheye lens is only the first lens to the ninth lens.
Further, the fisheye lens further satisfies: r11 < 16mm, and R11/R12 > 2.6, wherein R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.
Further, the fisheye lens further satisfies: nd5>1.8, where nd5 is the refractive index of the fifth lens.
Further, the fisheye lens further satisfies: nd2>1.8, where nd2 is the refractive index of the second lens.
Further, the fisheye lens further satisfies: | vd7-vd8 | 20, where vd7 and vd8 respectively represent the abbe numbers of the seventh lens and the eighth lens.
Further, the fisheye lens further satisfies: vd9 ≧ 60, where vd9 denotes the Abbe number of this ninth lens.
Further, the fisheye lens further satisfies: vd1 > 40, vd6 > 50, where vd1 and vd6 represent the abbe numbers of the first and sixth lenses, respectively.
Further, the optical diaphragm is arranged between the fifth lens and the sixth lens.
Further, the first lens to the ninth lens are made of glass materials.
The utility model has the advantages of:
the utility model adopts nine lenses, and each lens is correspondingly designed, so that the lens has a large field angle; the transfer function is high, and the contrast and the image quality are high; the day and night confocal performance is good, the day and night dual-purpose can be realized, and the high image quality can be kept at the same time in the day and at night; the color difference is small and the color reducibility is high under the wide spectrum 435-656nm of visible light.
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 435-656nm according to a first embodiment of the present invention;
FIG. 3 is a graph of MTF at 850nm in the first embodiment of the present invention;
fig. 4 is a schematic view of a color difference curve on an axis according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of an off-axis chromatic aberration curve according to a first embodiment of the present invention;
fig. 6 is a defocus graph of the visible light 435-656nm in the first embodiment of the present invention;
fig. 7 is a graph of infrared 850nm defocus curve of the first embodiment of the present invention;
fig. 8 is a schematic structural view of a second embodiment of the present invention;
FIG. 9 is a graph of MTF of 435-656nm in the second embodiment of the present invention;
FIG. 10 is an infrared 850nm MTF graph according to the second embodiment of the present invention;
fig. 11 is a schematic view of a color difference curve on an axis according to the second embodiment of the present invention;
fig. 12 is a schematic diagram of an off-axis chromatic aberration curve according to a second embodiment of the present invention;
fig. 13 is a defocus graph of 435-656nm visible light according to the second embodiment of the present invention;
fig. 14 is a graph of infrared 850nm defocus curve of the second embodiment of the present invention;
fig. 15 is a schematic structural view of a third embodiment of the present invention;
FIG. 16 is a graph of MTF of 435-656nm in the third embodiment of the present invention;
FIG. 17 is an infrared 850nm MTF graph according to a third embodiment of the present invention;
fig. 18 is a schematic view of a color difference curve on an axis according to a third embodiment of the present invention;
fig. 19 is a schematic diagram of an off-axis chromatic aberration curve according to a third embodiment of the present invention;
fig. 20 is a 435-656nm defocus graph of the third embodiment of the present invention;
fig. 21 is a graph of infrared 850nm defocus curve of the third embodiment of the present invention;
fig. 22 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 23 is a graph of MTF of visible light 435-656nm according to the fourth embodiment of the present invention;
fig. 24 is an MTF graph of infrared 850nm according to the fourth embodiment of the present invention;
fig. 25 is a schematic view of a color difference curve on an axis according to a fourth embodiment of the present invention;
fig. 26 is a schematic diagram of an off-axis chromatic aberration curve according to a fourth embodiment of the present invention;
fig. 27 is a defocus graph of 435-656nm visible light according to the fourth embodiment of the present invention;
fig. 28 is a graph of infrared 850nm defocus curve of the fourth embodiment 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.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics 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 provides a fish-eye lens for day and night use, which comprises a first lens to a ninth lens from an object side to an image side along an optical axis in sequence; the first lens element to the ninth 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 a convex image-side surface has a negative refractive index.
The fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive power has a concave object-side surface and a convex image-side surface.
The seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The third lens and the fourth lens are mutually glued, and the seventh lens and the eighth lens are mutually glued, so that chromatic aberration is optimized, and day and night confocal is realized; the lens with the refractive index of the fisheye lens is only the first lens to the ninth lens.
The utility model adopts nine lenses, and each lens is correspondingly designed, so that the lens has a large field angle; the transfer function is high, and the high-contrast high-image-quality image is achieved; the day and night confocal performance is good, the day and night dual-purpose can be realized, and the high image quality can be kept at the same time in the day and at night; the color difference is small and the color reducibility is high under the wide spectrum 435-656nm of visible light.
Preferably, the fisheye lens further satisfies: r11 < 16mm, and R11/R12 > 2.6, wherein R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively, further achieving a large field angle.
Preferably, the fisheye lens further satisfies: nd5>1.8, wherein nd5 is the refractive index of the fifth lens, and a high-refractive-index material is adopted, so that the resolution is further improved.
Preferably, the fisheye lens further satisfies: nd2>1.8, wherein nd2 is the refractive index of the second lens, and a high-refractive-index material is adopted, so that the image quality is further improved, and the outer diameter of the system is reduced.
Preferably, the fisheye lens further satisfies: | vd7-vd8 | 20, wherein vd7 and vd8 respectively represent the abbe numbers of the seventh lens and the eighth lens, further realizing multi-wavelength wide-spectrum achromatization and optimizing day and night confocal.
Preferably, the fisheye lens further satisfies: vd9 is more than or equal to 60, wherein vd9 represents the dispersion coefficient of the ninth lens, and the chromatic aberration of multi-wavelength wide spectrum is further reduced by adopting a low-dispersion material, so that day and night confocal is realized.
Preferably, the fisheye lens further satisfies: vd1 is more than 40, vd6 is more than 50, wherein vd1 and vd6 respectively represent the dispersion coefficients of the first lens and the sixth lens, and a low-dispersion material is adopted to further optimize chromatic aberration and optimize day and night confocal.
Preferably, the optical diaphragm is arranged between the fifth lens and the sixth lens, so that the overall performance of the system is further improved.
Preferably, the first lens to the ninth lens are made of glass materials, so that the overall performance of the system is further improved.
The following describes the fisheye lens of the present invention in detail with specific embodiments.
Example one
As shown in fig. 1, the fisheye lens for day and night use includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a stop 100, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a cover glass 110, and an image plane 120; the first lens element 1 to the ninth lens element 9 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays.
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 convex. Of course, in other embodiments, the object side surface 31 of the third lens element 3 may be flat or concave.
The fourth lens element 4 has a negative refractive index, and an object-side surface 41 of the fourth lens element 4 is concave and an image-side surface 42 of the fourth lens element 4 is concave.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 with positive refractive power 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 seventh lens element 7 has a negative refractive index, and an object-side surface 71 of the seventh lens element 7 is concave and an image-side surface 72 of the seventh lens element 7 is concave.
The eighth lens element 8 has a positive refractive index, and an object-side surface 81 of the eighth lens element 8 is convex and an image-side surface 82 of the eighth lens element 8 is convex.
The ninth lens element 9 with positive refractive power has a convex object-side surface 91 of the ninth lens element 9 and a convex image-side surface 92 of the ninth lens element 9.
The third lens 3 and the fourth lens 4 are cemented with each other, and the seventh lens 7 and the eighth lens 8 are cemented with each other.
In this embodiment, the first lens 1 to the ninth lens 9 are made of a glass material, but not limited thereto, and in other embodiments, the first lens 1 to the ninth lens 9 may also be made of other materials such as plastics.
In other embodiments, the diaphragm 100 may be disposed in other positions.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
| Surface of | Radius of curvature/mm | Thickness/spacing/mm | Material of | Refractive index | Coefficient of dispersion | Focal length/mm | ||
| - | Shot object | Infinity | Infinity | |||||
| 11 | First lens | 15.720 | 2.41 | Glass | 1.70 | 48.11 | -11.63 | |
| 12 | 4.748 | 2.35 | ||||||
| 21 | Second lens | 30.846 | 0.63 | Glass | 1.86 | 36.60 | -3.62 | |
| 22 | 2.803 | 4.77 | ||||||
| 31 | Third lens | 33.760 | 1.81 | Glass | 1.76 | 26.61 | 3.15 | |
| 32 | -2.546 | 0 | ||||||
| 41 | Fourth lens | -2.546 | 1.56 | Glass | 1.86 | 36.60 | -1.32 | |
| 42 | 2.637 | 0.20 | ||||||
| 51 | Fifth lens element | 3.648 | 1.60 | Glass | 1.92 | 20.88 | 2.89 | |
| 52 | -8.127 | 0.12 | ||||||
| 100 | Diaphragm | Infinity | 0.17 | |||||
| 61 | Sixth lens element | -18.948 | 1.22 | Glass | 1.64 | 60.21 | 8.35 | |
| 62 | -4.290 | 0.11 | ||||||
| 71 | Seventh lens element | -15.650 | 0.66 | Glass | 1.92 | 20.88 | -2.39 | |
| 72 | 2.659 | 0 | ||||||
| 81 | Eighth lens element | 2.659 | 1.56 | Glass | 1.66 | 54.66 | 3.18 | |
| 82 | -8.148 | 0.13 | ||||||
| 91 | Ninth lens | 4.967 | 1.46 | Glass | 1.49 | 81.59 | 5.51 | |
| 92 | -5.565 | 0.77 | ||||||
| 110 | Cover glass | Infinity | 0.50 | Glass | 1.52 | 64.21 | ||
| - | Infinity | 3.25 | ||||||
| 120 | Image plane | Infinity |
Referring to fig. 2 and 3, the MTF curve of the present embodiment can be seen in a high frequency of 300lp/mm, and the high image quality is maintained at the same time during the day (visible light) and at night (infrared 850 nm); referring to fig. 4 and 5, it can be seen that the chromatic aberration is small and the color reducibility is high under the visible light broad spectrum 435-656 nm; as shown in FIGS. 6 and 7, the confocal property of visible light and infrared 850nm can be seen, the infrared focal shift is 7 μm, the defocusing amount is small, the day and night confocal property is good, and the day and night dual-purpose is realized.
In this embodiment, R11/R12 is 3.31, the focal length f of the fisheye lens is 0.94mm, the aperture value FNO is 2.3, the field angle FOV is 220 °, the distance TTL from the object-side surface 11 of the first lens 1 to the image plane 120 is 25.30mm, and the image plane height IMH is 2.8 mm.
Example two
As shown in fig. 8, 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 focal length and the lens thickness of each 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 | Radius of curvature/mm | Thickness/spacing/mm | Material of | Refractive index | Coefficient of dispersion | Focal length/mm | ||
| - | Shot object | Infinity | Infinity | |||||
| 11 | First lens | 15.431 | 2.56 | Glass | 1.72916 | 54.67 | -11.09 | |
| 12 | 4.950 | 2.36 | ||||||
| 21 | Second lens | 36.655 | 1.19 | Glass | 1.85545 | 36.60 | -3.47 | |
| 22 | 2.719 | 5.00 | ||||||
| 31 | Third lens | 29.914 | 1.49 | Glass | 1.76182 | 26.61 | 3.23 | |
| 32 | -2.651 | 0 | ||||||
| 41 | Fourth lens | -2.651 | 0.93 | Glass | 1.85545 | 36.60 | -1.42 | |
| 42 | 2.656 | 0.20 | ||||||
| 51 | Fifth lens element | 3.698 | 1.72 | Glass | 1.92286 | 20.88 | 2.93 | |
| 52 | -8.153 | 0.12 | ||||||
| 100 | Diaphragm | Infinity | 0.15 | |||||
| 61 | Sixth lens element | -20.316 | 1.27 | Glass | 1.64000 | 60.21 | 8.27 | |
| 62 | -4.315 | 0.10 | ||||||
| 71 | Seventh lens element | -15.707 | 0.67 | Glass | 1.92286 | 20.88 | -2.4 | |
| 72 | 2.662 | 0 | ||||||
| 81 | Eighth lens element | 2.662 | 1.54 | Glass | 1.66461 | 54.66 | 3.18 | |
| 82 | -8.101 | 0.12 | ||||||
| 91 | Ninth lens | 4.987 | 1.52 | Glass | 1.49700 | 81.59 | 5.54 | |
| 92 | -5.552 | 0.75 | ||||||
| 110 | Cover glass | Infinity | 0.50 | Glass | 1.51680 | 64.21 | ||
| - | Infinity | 3.24 | ||||||
| 120 | Image plane | Infinity |
Referring to fig. 9 and 10, the MTF curve of the present embodiment can be seen in which the transfer function can reach a high frequency of 300lp/mm, and the image quality is maintained at the same time during the day (visible light) and at night (infrared 850 nm); referring to fig. 11 and 12, it can be seen that the chromatic aberration is small and the color reducibility is high under the visible broad spectrum 435-656 nm; as shown in FIGS. 13 and 14, the confocal property of visible light and infrared 850nm can be seen to be 3 μm, the defocusing amount is small, the confocal property is good at day and night, and the dual-purpose use of day and night is realized.
In this embodiment, R11/R12 is 3.12, f is 0.94mm, FNO is 2.3, FOV is 220 °, TTL is 25.40mm, and IMH is 2.8 mm.
EXAMPLE III
As shown in fig. 15, 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 focal length and the lens thickness of each 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
Referring to fig. 16 and 17, the MTF curves of the present embodiment show that the transfer function can reach a high frequency of 300lp/mm, and the high image quality can be maintained at the same time during the day (visible light) and at night (infrared 850 nm); referring to fig. 18 and 19, it can be seen that the chromatic aberration is small and the color reducibility is high under the visible broad spectrum 435-656 nm; as shown in FIGS. 20 and 21, the confocal property of visible light and infrared 850nm can be seen to be 5 μm, the defocusing amount is small, the confocal property is good at day and night, and the dual-purpose use of day and night is realized.
In this embodiment, R11/R12 is 2.76, f is 0.95mm, FNO is 2.3, FOV is 220 °, TTL is 25.40mm, and IMH is 2.8 mm.
Example four
As shown in fig. 22, the surface convexoconcave and the refractive index of each lens element of this embodiment are substantially the same as those of the first embodiment, only the object-side surface 31 of the third lens element 3 is a concave surface, and the optical parameters such as the focal length and the lens thickness of each lens element are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
Referring to fig. 23 and 24, the MTF curve of the present embodiment can be seen in a high frequency of 300lp/mm, and the high image quality is maintained at the same time during the day (visible light) and at night (infrared 850 nm); referring to fig. 25 and 26, it can be seen that the chromatic aberration is small and the color reducibility is high under the visible broad spectrum 435-656 nm; as shown in FIGS. 27 and 28, the confocal property of visible light and infrared 850nm can be seen, the infrared focal shift is 7 μm, the defocusing amount is small, the day and night confocal property is good, and the day and night dual-purpose is realized.
In this embodiment, R11/R12 is 2.80, f is 0.90mm, FNO is 2.3, FOV is 220 °, TTL is 25.98mm, and IMH is 2.8 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 day and night fish-eye lens is characterized in that: the optical lens assembly sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along an optical axis; the first lens element to the ninth lens element respectively comprise an object side surface facing the object side and allowing the imaging light to pass and an image side surface facing the image side and allowing the imaging light to pass;
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 image-side surface;
the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the sixth lens element with positive refractive index has a concave object-side surface and a convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the eighth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the third lens and the fourth lens are mutually cemented, and the seventh lens and the eighth lens are mutually cemented;
the lens with the refractive index of the fisheye lens is only the first lens to the ninth lens.
2. The fisheye lens for day and night use as claimed in claim 1, further satisfying: r11 < 16mm, and R11/R12 > 2.6, wherein R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens, respectively.
3. The fisheye lens for day and night use as claimed in claim 1, further satisfying: nd5>1.8, where nd5 is the refractive index of the fifth lens.
4. The fisheye lens for day and night use as claimed in claim 1, further satisfying: nd2>1.8, where nd2 is the refractive index of the second lens.
5. The fisheye lens for day and night use as claimed in claim 1, further satisfying: | vd7-vd8 | 20, where vd7 and vd8 respectively represent the abbe numbers of the seventh lens and the eighth lens.
6. The fisheye lens for day and night use as claimed in claim 1, further satisfying: vd9 ≧ 60, where vd9 denotes the Abbe number of this ninth lens.
7. The fisheye lens for day and night use as claimed in claim 1, further satisfying: vd1 > 40, vd6 > 50, where vd1 and vd6 represent the abbe numbers of the first and sixth lenses, respectively.
8. The fisheye lens for day and night use according to claim 1, characterized in that: and the diaphragm is arranged between the fifth lens and the sixth lens.
9. The fisheye lens for day and night use according to claim 1, characterized in that: the first lens to the ninth lens are made of glass materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114620A (en) * | 2021-11-19 | 2022-03-01 | 江西凤凰光学科技有限公司 | High-definition day and night high-low temperature confocal optical lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114620A (en) * | 2021-11-19 | 2022-03-01 | 江西凤凰光学科技有限公司 | High-definition day and night high-low temperature confocal optical lens |
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