CN210294656U - Fisheye lens - Google Patents
Fisheye lens Download PDFInfo
- Publication number
- CN210294656U CN210294656U CN201921497825.3U CN201921497825U CN210294656U CN 210294656 U CN210294656 U CN 210294656U CN 201921497825 U CN201921497825 U CN 201921497825U CN 210294656 U CN210294656 U CN 210294656U
- Authority
- CN
- China
- Prior art keywords
- lens
- image
- refractive index
- convex
- lens element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Lenses (AREA)
Abstract
The utility model relates to a camera lens technical field. The utility model discloses a fish-eye lens, which comprises a first lens, a sixth lens, a diaphragm, a seventh lens, a tenth lens and a lens, wherein the first lens, the sixth lens, the diaphragm and the seventh lens are arranged from the object side to the image side along an optical axis; 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 is a convex-concave lens with negative refractive index; the fourth lens is a concave lens with negative refractive index; the fifth lens is a convex lens with positive refractive index; the sixth lens is a convex-concave lens with positive refractive index; the seventh lens is a plano-convex lens with positive refractive index; the eighth lens is a concave-convex lens with negative refractive index; the ninth lens is a convex lens with positive refractive index; the tenth lens is a concave-convex lens with negative refractive index; the seventh lens and the eighth lens are cemented to each other, and the ninth lens and the fourth lens are cemented to each other. The utility model has the advantages of large image surface, large field angle, high resolution, good uniformity, good imaging quality and good infrared confocal performance.
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. At present, fisheye lenses are widely applied to the fields of security monitoring, vehicle-mounted monitoring and the like, so that the requirements on the fisheye lenses are higher and higher, but the existing common fisheye lenses have the defects of low pixel, large difference of resolving power from the center to the edge and poor uniformity; when the method is applied to an infrared band, obvious defocusing can occur, and the image quality is extremely poor; the aberration correction difficulty is high, the chromatic aberration of the lens edge is high, the purple fringing is serious, and the color reduction degree is poor; the image plane is smaller, the view field angle is small, and the problem of small corresponding shooting view field cannot meet the increasingly improved requirements.
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, a diaphragm, a seventh lens, a sixth lens, a seventh lens, a tenth lens and a lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from an object side to; the first lens element to the tenth 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 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 convex object-side surface and a concave image-side surface; the seventh lens element with positive refractive power has a planar 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 ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the tenth 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 image side surface of the ninth lens and the object side surface of the tenth lens are mutually cemented;
the fisheye lens has only ten lenses with refractive indexes.
Further, the fisheye lens further satisfies: 1.9< nd1<2.0, where nd1 is the refractive index of the first lens at d-line.
Further, the fisheye lens further satisfies: nd3>1.9, where nd3 is the refractive index of the third lens at d-line.
Further, the fisheye lens further satisfies: nd6>1.9, where nd6 is the refractive index of the sixth lens at d-line.
Further, the fisheye lens further satisfies: D12/R12 is less than 1.85, D22/R22 is less than 1.8, wherein D12 is the clear aperture of the image side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, D22 is the clear aperture of the image side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens.
Further, the image side surface of the fourth lens and the object side surface of the fifth lens are mutually glued.
Further, the fisheye lens also satisfies: vd4-vd5 > 35, where vd4 and vd5 represent the d-line abbe numbers of the fourth and fifth lenses, respectively.
Further, the fisheye lens further satisfies: 1.5< nd2<1.65, 55< vd2<65, 1.9< nd3<2.0, 15< vd3<20, 1.4< nd4<1.5, 63< vd4<70, 1.9< nd5<2.05, 20< vd5<28, 1.9< nd6<2.05, 23< vd6<28, 1.5< nd7<1.65, 65< vd7<70, 1.8< nd8<2.05, 18< vd8<25, 1.5< nd9<1.65, 65< vd 970, 1.8< nd10<2.05, 18< vd10<25, wherein, 2-10 are the refractive indices of the second lens to the tenth lens, respectively, and vd 2-2 6 are the dispersion coefficients of the second lens 10 to the tenth lens, respectively.
Further, the fisheye lens further satisfies: vd7-vd8 > 30, vd9-vd10 > 30, wherein vd7, vd8, vd9 and vd10 respectively represent the abbe numbers of the seventh lens, the eighth lens, the ninth lens and the tenth lens in the d line.
Further, the temperature coefficient of relative refractive index dn/dt of the ninth lens is less than 0.
The utility model has the advantages of:
the utility model adopts ten lenses, and through correspondingly relating to each lens, the full-view resolution is high, the center-to-edge uniformity is high, the definition of the image is ensured, and the whole image quality is uniform; the infrared mode is switched under the condition of visible light focusing, the defocusing is small, and the night vision is clear; the field-of-view chromatic aberration is small, and the color reducibility is good; the image plane is large, the field angle is large, and the sensor with a larger image plane can be supported.
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 0.435-0.656 μm in visible light according to the first embodiment of the present invention;
FIG. 3 is a defocus plot of 0.435-0.656 μm visible light according to the first embodiment of the present invention;
FIG. 4 is a MTF chart of 0.850 μm infrared in accordance with the first embodiment of the present invention;
fig. 5 is a defocus graph of 0.850 μm infrared in the first embodiment of the present invention;
fig. 6 is a vertical axis aberration curve diagram according to a first embodiment of the present invention;
fig. 7 is a lateral chromatic aberration curve diagram according to a first embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 9 is a graph of MTF of 0.435-0.656 μm in visible light according to example II of the present invention;
fig. 10 is a defocus graph of 0.435-0.656 μm visible light according to the second embodiment of the present invention;
FIG. 11 is an MTF chart of infrared 0.850 μm according to the second embodiment of the present invention;
fig. 12 is a defocus graph of 0.850 μm infrared in the second embodiment of the present invention;
fig. 13 is a vertical axis aberration graph according to the second embodiment of the present invention;
fig. 14 is a lateral chromatic aberration curve of the second embodiment of the present invention;
fig. 15 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 16 is a graph of MTF of 0.435-0.656 μm in visible light according to the third embodiment of the present invention;
fig. 17 is a defocus graph of 0.435-0.656 μm visible light according to the third embodiment of the present invention;
FIG. 18 is a MTF chart of 0.850 μm infrared in the third embodiment of the present invention;
fig. 19 is a defocus graph of 0.850 μm infrared in the third embodiment of the present invention;
fig. 20 is a vertical axis aberration graph according to a third embodiment of the present invention;
fig. 21 is a lateral chromatic aberration curve of a 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 0.435-0.656 μm in visible light according to the fourth embodiment of the present invention;
fig. 24 is a defocus graph of 0.435-0.656 μm visible light according to the fourth embodiment of the present invention;
fig. 25 is an MTF plot of infrared 0.850 μm for embodiment four of the present invention;
fig. 26 is a defocus graph of 0.850 μm infrared in the fourth embodiment of the present invention;
fig. 27 is a vertical axis aberration graph according to the fourth embodiment of the present invention;
fig. 28 is a lateral chromatic aberration curve of the fourth embodiment of the present invention;
fig. 29 is a table of values of relevant important parameters according to four 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 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, a sixth lens, a diaphragm, a seventh lens, a tenth lens and a lens, wherein the first lens, the sixth lens, the diaphragm and the seventh lens are arranged from the object side to the image side along an optical axis; the first lens element to the tenth 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 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 convex object-side surface and a concave image-side surface; the seventh lens element has positive refractive index, the object side surface of the seventh lens element is a plane and is matched with Gstop (air gap before and after diaphragm), so that the seventh lens element can provide structural design with good tolerance support, the interval tolerance can be controlled at 0.02mm, and the image side surface of the seventh lens element is a convex surface; the eighth lens element with negative refractive index has a concave 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 tenth lens element with a 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 image side surface of the nine lens and the object side surface of the tenth lens are cemented with each other.
The fisheye lens has only ten lenses with refractive indexes. The utility model adopts ten lenses, and through correspondingly designing each lens, the full visual field resolution is high, and the center-to-edge uniformity is high, thereby ensuring the definition of the image and the overall image quality is uniform; the infrared mode is switched under the condition of visible light focusing, the defocusing is small, and the night vision is clear; the field-of-view chromatic aberration is small, and the color reducibility is good; the image plane is large, the field angle is large, and the sensor with a larger image plane can be supported.
Preferably, the fisheye lens further satisfies: 1.9< nd1<2.0, wherein nd1 is the refractive index of the first lens in the d line, which is convenient for designing the large image plane of the fisheye lens and ensures the field angle.
Preferably, the fisheye lens further satisfies: nd3>1.9, wherein nd3 is the refractive index of the third lens at the d line, further optimizing the image quality.
Preferably, the fisheye lens further satisfies: nd6>1.9, wherein nd6 is the refractive index of the sixth lens in the d line, and further optimizes the image quality.
Preferably, the fisheye lens further satisfies: D12/R12 is less than 1.85, D22/R22 is less than 1.8, wherein D12 is the clear aperture of the image side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, D22 is the clear aperture of the image side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens, so that the lens is convenient to process.
Preferably, the image-side surface of the fourth lens and the object-side surface of the fifth lens are cemented to each other to perform an achromatic function.
More preferably, the fisheye lens further satisfies: vd4-vd5 > 35, where vd4 and vd5 represent the d-line abbe numbers of the fourth lens and the fifth lens, respectively, and a high-dispersion material is combined with a low-dispersion material to further achromatize.
Preferably, the fisheye lens further satisfies: 1.5< nd2<1.65, 55< vd2<65, 1.9< nd3<2.0, 15< vd3<20, 1.4< nd4<1.5, 63< vd4<70, 1.9< nd5<2.05, 20< vd5<28, 1.9< nd6<2.05, 23< vd6<28, 1.5< nd7<1.65, 65< vd7<70, 1.8< nd8<2.05, 18< vd8<25, 1.5< nd9<1.65, 65< vd <970, 1.8< nd10<2.05, 18< vd10<25, wherein, 2-10 are the refractive indices of the second to tenth lenses, respectively, vd 2-2 6 to 10 are the refractive indices of the second to tenth lenses, respectively, and the infrared shift amounts to a better value than the infrared shift amount of the second to the tenth lenses.
Preferably, the fisheye lens further satisfies: vd7-vd8 > 30, vd9-vd10 > 30, wherein vd7, vd8, vd9 and vd10 respectively represent the dispersion coefficients of the seventh lens, the eighth lens, the ninth lens and the tenth lens at the d line, and the high dispersion material and the low dispersion material are combined to play the achromatization role.
Preferably, the temperature coefficient dn/dt of the relative refractive index of the ninth lens is less than 0, which is helpful for lengthening the back focal length of the fisheye lens at high temperature and controlling the temperature drift.
Preferably, the fisheye lens further satisfies: ALT <15.5mm, ALG <15.5mm, and ALT/ALG <1.15, wherein ALG is the sum of air gaps between the first lens and the imaging plane on the optical axis, and ALT is the sum of ten lens thicknesses between the first lens and the tenth 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.
The following describes the fisheye lens of the present invention in detail with specific embodiments.
Example one
As shown in fig. 1, a fish-eye lens includes, in order along an optical axis I from an object side a1 to an image side a2, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a stop 110, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 100, a protective sheet 120, and an image plane 130; the first lens element 1 to the tenth lens element 100 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 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 convex object-side surface 61 of the sixth lens element 6 and a concave image-side surface 62 of the sixth lens element 6.
The seventh lens element 7 has a positive refractive index, the object-side surface 71 of the seventh lens element 7 is a plane, and the image-side surface 72 of the seventh lens element 7 is a convex surface.
The eighth lens element 8 has a negative refractive index, and an object-side surface 81 of the eighth lens element 8 is concave 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 tenth lens element 100 with negative refractive index has a concave object-side surface 101 of the tenth lens element 100 and a convex image-side surface 102 of the tenth lens element 100.
In this embodiment, the image-side surface 42 of the fourth lens element 4 and the object-side surface 51 of the fifth lens element 5 are cemented to each other, the image-side surface 72 of the seventh lens element 7 and the object-side surface 81 of the eighth lens element 8 are cemented to each other, and the image-side surface 92 of the ninth lens element 9 and the object-side surface 101 of the tenth lens element 100 are cemented to each other.
In this embodiment, the temperature coefficient of relative refractive index dn/dt of the ninth lens 9 is less than 0.
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 (mm) | Radius of curvature (mm) | Thickness (mm) | Material of | Refractive index | Coefficient of dispersion | Focal length (mm) | ||
| - | Shot |
0 | | Infinity | |||||
| 11 | First lens | 19.03 | 16.540 | 1.20 | H-ZF88 | 1.95 | 17.94 | -11.57 | |
| 12 | 11.68 | 6.401 | 3.71 | ||||||
| 21 | Second lens | 10.98 | 50.160 | 0.70 | H-ZK3A | 1.59 | 61.25 | -7.72 | |
| 22 | 7.29 | 4.164 | 2.08 | ||||||
| 31 | Third lens | 9.00 | 22.652 | 0.77 | H-ZF88 | 1.95 | 17.94 | -20.00 | |
| 32 | 7.75 | 10.208 | 1.30 | ||||||
| 41 | Fourth lens | 7.29 | -15.939 | 0.86 | H-QK1 | 1.47 | 66.88 | -16.20 | |
| 42 | 8.40 | 14.943 | 0 | ||||||
| 51 | Fifth lens element | 8.40 | 14.943 | 2.42 | H-ZLAF90 | 2.00 | 25.44 | 11.07 | |
| 52 | 8.40 | -40.839 | 0.10 | ||||||
| 61 | Sixth lens element | 8.40 | 7.482 | 2.26 | H-ZLAF90 | 2.00 | 25.44 | 8.79 | |
| 62 | 4.46 | 40.294 | 1.49 | ||||||
| 110 | Diaphragm | 3.30 | Infinity | 1.32 | |||||
| 71 | Seventh lens element | 3.16 | Infinity | 2.45 | FCD515 | 1.59 | 68.62 | 4.84 | |
| 72 | 5.20 | -2.882 | 0 | ||||||
| 81 | Eighth lens element | 5.20 | -2.882 | 1.16 | H-ZF62 | 1.92 | 20.88 | -6.95 | |
| 82 | 8.40 | -6.190 | 0.10 | ||||||
| 91 | Ninth lens | 6.92 | 7.608 | 2.59 | FCD515 | 1.59 | 68.62 | 6.83 | |
| 92 | 6.97 | -7.608 | 0 | ||||||
| 101 | Tenth lens | 6.97 | -7.608 | 0.75 | H-ZF88 | 1.95 | 17.94 | -13.72 | |
| 102 | 8.40 | -18.927 | 0.43 | ||||||
| 120 | Protective sheet | 7.30 | Infinity | 0.70 | H-K9L | 1.52 | 64.21 | - | |
| - | 7.34 | Infinity | 3.92 | ||||||
| 130 | Image plane | 7.62 | Infinity |
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 2 and 4, the MTF curves of the present embodiment show that the full-field resolution is high, visible light can reach 200lp/mm > 0.3, infrared can reach 125lp/mm > 0.15, and the uniformity is good; as shown in fig. 3 and 5, the confocal performance of visible light and infrared 850nm is good, and when visible light and infrared light are switched, the infrared defocusing IRShift is less than 15 μm; FIG. 6 shows the vertical axis aberration curve, the vertical axis aberration is very small and less than 10 μm; the lateral chromatic aberration is shown in detail in fig. 7, and it can be seen that the lateral chromatic aberration is less than 5.5 μm.
In this embodiment, the focal length f of the fisheye lens is 2.537mm, the aperture value FNO is 2.2, the field angle FOV is 190 °, the image plane size Φ is 7.6mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 30.30 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 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
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 9 and 11, the MTF curve of the present embodiment shows that the resolution of the full field is high, the visible light can reach 200lp/mm > 0.3, the infrared can reach 125lp/mm > 0.25, and the uniformity is good; as shown in fig. 10 and 12, the confocal performance of visible light and infrared 850nm is good, and when visible light and infrared light are switched, the infrared defocusing IRShift is less than 15 μm; FIG. 13 shows the vertical axis aberration curve, the vertical axis aberration is very small and less than 10 μm; the lateral chromatic aberration is detailed in fig. 14, and it can be seen that the lateral chromatic aberration is less than 5.5 μm.
In this embodiment, the focal length f of the fisheye lens is 2.535mm, the aperture value FNO is 2.2, the field angle FOV is 190 °, the image plane size Φ is 7.6mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 30.30 mm.
EXAMPLE III
As shown in fig. 15, in this embodiment, the surface-type convexo-concave shapes and refractive indexes of the lenses 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, the thickness of the lens, and the like are different, and in this embodiment, the fourth lens element 4 and the fifth lens element 5 are not cemented.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 16 and 18, the MTF curve of the present embodiment shows that the resolution of the full field is high, the visible light can reach 200lp/mm > 0.3, the infrared can reach 125lp/mm > 0.15, and the uniformity is good; as shown in fig. 17 and fig. 19, the confocal performance of visible light and infrared 850nm is good, and when visible light and infrared light are switched, the infrared defocusing IRShift is less than 15 μm; FIG. 20 shows the vertical axis aberration curve, the vertical axis aberration is very small and less than 10 μm; the lateral chromatic aberration is detailed in fig. 21, and it can be seen that the lateral chromatic aberration is less than 5.5 μm.
In this embodiment, the focal length f of the fisheye lens is 2.518mm, the aperture value FNO is 2.2, the field angle FOV is 190 °, the image plane size Φ is 7.6mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the imaging surface 130 on the optical axis I is 30.30 mm.
Example four
As shown in fig. 22, in this embodiment, the surface-type convexo-concave shapes and refractive indexes of the lenses 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, the thickness of the lens, and the like are different, and in this embodiment, the fourth lens element 4 and the fifth lens element 5 are not cemented.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
Please refer to fig. 29 for values of the conditional expressions according to this embodiment.
Referring to fig. 23 and 25, the MTF curve of the present embodiment shows that the resolution of the full field is high, the visible light can reach 200lp/mm > 0.3, the infrared can reach 125lp/mm > 0.20, and the uniformity is good; as shown in fig. 24 and 26, the confocal performance of visible light and infrared 850nm is good, and when visible light and infrared light are switched, the infrared defocusing IRShift is less than 15 μm; FIG. 27 shows the vertical axis aberration curve, the vertical axis aberration is very small and less than 10 μm; the lateral chromatic aberration is shown in detail in fig. 28, and it can be seen that the lateral chromatic aberration is less than 5.5 μm.
In this embodiment, the focal length f of the fisheye lens is 2.517mm, the aperture value FNO is 2.2, the field angle FOV is 190 °, the image plane size Φ is 7.6mm, and the distance TTL between the object-side surface 11 of the first lens 1 and the image plane 130 on the optical axis I is 30.30 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 (10)
1. A fisheye lens characterized in that: the lens assembly comprises first to sixth lenses, a diaphragm and seventh to tenth lenses in sequence from an object side to an image side along an optical axis; the first lens element to the tenth 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 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 convex object-side surface and a concave image-side surface; the seventh lens element with positive refractive power has a planar 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 ninth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the tenth 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 image side surface of the ninth lens and the object side surface of the tenth lens are mutually cemented;
the fisheye lens has only ten lenses with refractive indexes.
2. The fisheye lens of claim 1, further satisfying: 1.9< nd1<2.0, where nd1 is the refractive index of the first lens at d-line.
3. The fisheye lens of claim 1, further satisfying: nd3>1.9, where nd3 is the refractive index of the third lens at d-line.
4. The fisheye lens of claim 1, further satisfying: nd6>1.9, where nd6 is the refractive index of the sixth lens at d-line.
5. The fisheye lens of claim 1, further satisfying: D12/R12 is less than 1.85, D22/R22 is less than 1.8, wherein D12 is the clear aperture of the image side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens, D22 is the clear aperture of the image side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens.
6. The fisheye lens of claim 1 wherein the image-side surface of the fourth lens element is cemented to the object-side surface of the fifth lens element.
7. The fisheye lens of claim 6, further comprising: vd4-vd5 > 35, where vd4 and vd5 represent the d-line abbe numbers of the fourth and fifth lenses, respectively.
8. The fisheye lens of claim 6, further comprising: 1.5< nd2<1.65, 55< vd2<65, 1.9< nd3<2.0, 15< vd3<20, 1.4< nd4<1.5, 63< vd4<70, 1.9< nd5<2.05, 20< vd5<28, 1.9< nd6<2.05, 23< vd6<28, 1.5< nd7<1.65, 65< vd7<70, 1.8< nd8<2.05, 18< vd8<25, 1.5< nd9<1.65, 65< vd 970, 1.8< nd10<2.05, 18< vd10<25, wherein, 2-10 are the refractive indices of the second lens to the tenth lens, respectively, and vd 2-2 6 are the dispersion coefficients of the second lens 10 to the tenth lens, respectively.
9. The fisheye lens of claim 1, further satisfying: vd7-vd8 > 30, vd9-vd10 > 30, wherein vd7, vd8, vd9 and vd10 respectively represent the abbe numbers of the seventh lens, the eighth lens, the ninth lens and the tenth lens in the d line.
10. The fisheye lens of claim 1, wherein: the temperature coefficient of relative refractive index dn/dt of the ninth lens is less than 0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921497825.3U CN210294656U (en) | 2019-09-10 | 2019-09-10 | Fisheye lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921497825.3U CN210294656U (en) | 2019-09-10 | 2019-09-10 | Fisheye lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210294656U true CN210294656U (en) | 2020-04-10 |
Family
ID=70064293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921497825.3U Active CN210294656U (en) | 2019-09-10 | 2019-09-10 | Fisheye lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210294656U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542994A (en) * | 2019-09-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | fisheye lens |
| CN112180548A (en) * | 2020-09-29 | 2021-01-05 | 中国科学院长春光学精密机械与物理研究所 | Near-infrared fisheye optical system for airborne laser warning |
-
2019
- 2019-09-10 CN CN201921497825.3U patent/CN210294656U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542994A (en) * | 2019-09-10 | 2019-12-06 | 厦门力鼎光电股份有限公司 | fisheye lens |
| CN110542994B (en) * | 2019-09-10 | 2024-05-17 | 厦门力鼎光电股份有限公司 | Fish-eye lens |
| CN112180548A (en) * | 2020-09-29 | 2021-01-05 | 中国科学院长春光学精密机械与物理研究所 | Near-infrared fisheye optical system for airborne laser warning |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109799597B (en) | Optical imaging lens | |
| CN210348046U (en) | Fisheye lens | |
| CN110542994B (en) | Fish-eye lens | |
| CN111929861A (en) | High definition fisheye lens | |
| CN210294656U (en) | Fisheye lens | |
| CN111722378A (en) | Large-image-plane high-resolution fisheye lens | |
| CN212276084U (en) | High definition fisheye lens | |
| CN210534419U (en) | Fisheye lens | |
| CN211955960U (en) | Optical imaging lens with fixed focus and low chromatic aberration | |
| CN210488106U (en) | Fisheye lens | |
| CN211180372U (en) | Optical imaging lens | |
| CN209979920U (en) | Fisheye lens | |
| CN211014806U (en) | Fisheye lens | |
| CN111190267A (en) | Wide-angle optical imaging lens | |
| CN216526490U (en) | High-definition miniaturized day and night confocal lens | |
| CN210109454U (en) | Fisheye lens | |
| CN214151210U (en) | Large-target-surface imaging lens | |
| CN211478749U (en) | Fish-eye lens for day and night use | |
| CN213780517U (en) | Optical imaging lens | |
| CN211293431U (en) | Wide-angle optical imaging lens | |
| CN213069311U (en) | Internal focusing type imaging lens | |
| CN212321968U (en) | Large-image-plane high-resolution fisheye lens | |
| CN210626773U (en) | Fisheye lens | |
| CN211402905U (en) | Wide-angle optical imaging lens | |
| CN211014818U (en) | Zoom lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |