CN213957730U - Fisheye lens - Google Patents
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- CN213957730U CN213957730U CN202120135078.XU CN202120135078U CN213957730U CN 213957730 U CN213957730 U CN 213957730U CN 202120135078 U CN202120135078 U CN 202120135078U CN 213957730 U CN213957730 U CN 213957730U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses a fisheye lens, which comprises six lenses; the first lens is a convex-concave lens with negative refractive index; the second lens is a concave lens with negative refractive index; the third lens, the fourth lens and the sixth lens are all convex lenses with positive refractive index; the fifth lens is a convex-concave lens with negative refractive index; the object side surface and the image side surface of the second lens, the fourth lens and the fifth lens are all aspheric surfaces. The utility model has the advantages of short total length, small volume and low cost; the resolution ratio is high, and the imaging quality is good; the field angle is large; the image surface is large; the aperture is large.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to a fisheye camera lens of big image plane large aperture.
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-mounted monitoring and the like, so that the requirement on the fisheye lens is higher and higher.
However, the fish-eye lens in the current market has many defects, for example, the number of the used lenses is too large, so that the overall cost of the lens is too high, the total length of the lens system is long, and the installation and the use have limitations; the field angle is small, the picture capture width by the lens is insufficient, and the requirement of motion picture capture is difficult to meet; the imaging surface is small, and the light sensitivity is poor; the aperture is small, and clear imaging cannot be realized when the illumination is insufficient; the temperature drift amount of the lens is large, when the temperature disturbance is too large, the imaging quality is affected, and the like, the increasingly improved requirements cannot be met, and the improvement is needed.
Disclosure of Invention
An object of the utility model is to provide a fisheye lens is used for solving the technical problem of at least part above-mentioned existence.
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 and a sixth lens in sequence from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
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 concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the object side surface and the image side surface of the second lens, the fourth lens and the fifth lens are aspheric surfaces;
the lens with the refractive index of the fisheye lens only comprises the first lens, the second lens and the sixth lens.
Furthermore, the second lens, the fourth lens and the fifth lens are all made of plastic materials, and the first lens, the third lens and the sixth lens are all made of glass materials.
Further, the fisheye lens further satisfies: -5mm < f1< -4mm, -6mm < f2< -5mm, 4mm < f3<5mm, 3mm < f4<4mm, -5mm < f5< -3mm, 6mm < f6<7mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
Further, the fisheye lens further satisfies: -3< (f1/f) < -1, -3< (f2/f) < -1, 1< (f3/f) <3, 1< (f4/f) <3, -3< (f5/f) < -1, 1< (f6/f) <3, wherein f is the focal length of the fisheye lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
Further, the fisheye lens further satisfies: 13mm < R11<15mm, 2mm < R12<4mm, -7mm < R21< -5mm, 4mm < R22<5mm, 6mm < R31<8mm, -9mm < R32< -7mm, 3mm < R41<5mm, -4mm < R42< -3mm, 500mm < R51<1200mm, -2mm < R52<3.5mm, 6mm < R61<9mm, -9mm < R62< -7mm, wherein, R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens element, R21 and R22 are radii of curvature of the object-side surface and the image-side surface of the second lens element, R31 and R32 are radii of curvature of the object-side surface and the image-side surface of the third lens element, R41 and R42 are radii of curvature of the object-side surface and the image-side surface of the fourth lens element, R51 and R52 are radii of curvature of the object-side surface and the image-side surface of the fifth lens element, and R61 and R62 are radii of curvature of the object-side surface and the image-side surface of the sixth lens element, respectively.
Further, the fisheye lens further satisfies: 1.7< nd1<1.9, 40.0< vd1<50.0, 1.5< nd2<1.7, 50.0< vd2<60.0, 1.8< nd3<2.0, 35.0< vd3<45.0, 1.5< nd4<1.6, 50.0< vd4<60.0, 1.6< nd5<1.8, 15.0< vd5<23.0, 1.5< nd6<1.7, 50.0< vd6<70.0, wherein nd1, 2, nd3, nd4, nd5 and nd6 are the refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and the refractive indices of the nd1, vd 639, 6862, nd 69556, nd 8253, the fourth lens, the fifth lens and the sixth lens are the refractive indices of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the fifth lens, the.
Further, the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the third lens, the fourth lens and the sixth lens is in the range of 0.45-0.85; the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens and the fifth lens is in the range of 1.6-2.1; the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the second lens is in the range of 2.5-2.9.
Further, the object-side surface and the image-side surface of the second lens, the fourth lens and the fifth lens are all 16-order even-order aspheric surfaces.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, the fisheye lens further satisfies: TTL <17.20mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.
The utility model has the advantages of:
the utility model adopts six lenses, which has low cost; the total length is short, the whole volume is small, and the installation and the use are convenient; the resolution ratio is high, and the imaging quality is good; the image surface is large, and the light sensitivity is better; the field angle is large, and the range of the shot picture is large; the aperture is large, and the imaging can be rapidly and clearly carried out under low illumination. In addition, the utility model has small temperature drift amount, and can well keep the working state at various temperatures; good anti-vibration performance.
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 0.470-0.650 μm in visible light according to the first embodiment of the present invention;
FIG. 3 is a defocus plot of 0.470-0.650 μm visible light at 60lp/mm according to the first embodiment of the present invention;
fig. 4 is a schematic view of lateral chromatic aberration according to a first embodiment of the present invention;
fig. 5 is a schematic view of longitudinal chromatic aberration according to the first embodiment of the present invention;
fig. 6 is a schematic view of field curvature and distortion curve according to the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 8 is a graph of MTF of 0.470-0.650 μm in visible light according to example II of the present invention;
FIG. 9 is a defocus plot of 60lp/mm visible light of 0.470-0.650 μm in accordance with the second embodiment of the present invention;
fig. 10 is a schematic view of lateral chromatic aberration of a second embodiment of the present invention;
fig. 11 is a schematic view of longitudinal chromatic aberration of a second embodiment of the present invention;
fig. 12 is a schematic view of field curvature and distortion curve of the second embodiment of the present invention;
fig. 13 is a schematic structural view of a third embodiment of the present invention;
FIG. 14 is a graph of MTF of 0.470-0.650 μm in visible light according to the third embodiment of the present invention;
FIG. 15 is a defocus plot of 60lp/mm visible light of 0.470-0.650 μm in the third embodiment of the present invention;
fig. 16 is a schematic view of lateral chromatic aberration of a third embodiment of the present invention;
fig. 17 is a schematic view of longitudinal chromatic aberration in the third embodiment of the present invention;
fig. 18 is a schematic view of field curvature and distortion curve of a third embodiment of the present invention;
fig. 19 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 20 is a graph of MTF of 0.470-0.650 μm in visible light according to example four of the present invention;
FIG. 21 is a defocus plot of 60lp/mm in visible light of 0.470-0.650 μm according to the fourth embodiment of the present invention;
fig. 22 is a schematic view of lateral chromatic aberration according to a fourth embodiment of the present invention;
fig. 23 is a schematic view of longitudinal chromatic aberration according to a fourth embodiment of the present invention;
fig. 24 is a schematic view of field curvature and distortion curve of the fourth embodiment of the present invention;
fig. 25 is a schematic structural diagram of a fifth embodiment of the present invention;
fig. 26 is a graph of MTF of 0.470-0.650 μm in visible light according to example v of the present invention;
FIG. 27 is a defocus plot of 60lp/mm in visible light of 0.470-0.650 μm in accordance with example V of the present invention;
fig. 28 is a schematic view of lateral chromatic aberration of a fifth embodiment of the present invention;
fig. 29 is a schematic view of longitudinal chromatic aberration of a fifth embodiment of the present invention;
fig. 30 is a schematic view of field curvature and distortion curve of embodiment five 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 provides a fish-eye lens, which comprises a first lens, a second lens and a third lens from an object side to an image side along an optical axis in sequence; the first lens element to the sixth 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 concave object-side surface and a concave image-side surface.
The third lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fourth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The fifth lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The object side surface and the image side surface of the second lens, the fourth lens and the fifth lens are all aspheric surfaces.
The lens with the refractive index of the fisheye lens only comprises the first lens, the second lens and the sixth lens. The utility model adopts six lenses, which has low cost; the total length is short, the whole volume is small, and the installation and the use are convenient; the resolution ratio is high, and the imaging quality is good; the image surface is large, and the light sensitivity is better; the field angle is large, and the range of the shot picture is large; the aperture is large, and the imaging can be rapidly and clearly carried out under low illumination.
Preferably, the second lens, the fourth lens and the fifth lens are all made of plastic materials, and the first lens, the third lens and the sixth lens are all made of glass materials, so that the cost is further reduced.
Preferably, the fisheye lens further satisfies: -5mm < f1< -4mm, -6mm < f2< -5mm, 4mm < f3<5mm, 3mm < f4<4mm, -5mm < f5< -3mm, 6mm < f6<7mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
Preferably, the fisheye lens further satisfies: -3< (f1/f) < -1, -3< (f2/f) < -1, 1< (f3/f) <3, 1< (f4/f) <3, -3< (f5/f) < -1, 1< (f6/f) <3, wherein f is the focal length of the fisheye lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens, the optical powers of the lenses are distributed reasonably, the chromatic aberration is corrected, and the influence of temperature drift is reduced, and the influence of temperature disturbance on imaging quality is reduced.
Preferably, the fisheye lens further satisfies: 13mm < R11<15mm, 2mm < R12<4mm, -7mm < R21< -5mm, 4mm < R22<5mm, 6mm < R31<8mm, -9mm < R32< -7mm, 3mm < R41<5mm, -4mm < R42< -3mm, 500mm < R51<1200mm, -2mm < R52<3.5mm, 6mm < R61<9mm, -9mm < R62< -7mm, wherein R11 and R12 are the radii of curvature of the object side and image side surfaces, respectively, of the first lens, R21 and R22 are the radii of curvature of the object side and image side surfaces, respectively, of the second lens, R31 and R32 are the radii of curvature of the object side and image side surfaces, respectively, of the third lens, R41 and R42 are the radii of curvature of the object side and image side surfaces, respectively, R6356 and R61 are the radii of curvature of the object side and image side surfaces, respectively, of the sixth lens, and R828653, so that the light rays are more gentle and the aberration is further optimized.
Preferably, the fisheye lens further satisfies: 1.7< nd1<1.9, 40.0< vd1<50.0, 1.5< nd2<1.7, 50.0< vd2<60.0, 1.8< nd3<2.0, 35.0< vd3<45.0, 1.5< nd4<1.6, 50.0< vd4<60.0, 1.6< nd5<1.8, 15.0< vd5<23.0, 1.5< nd6<1.7, 50.0< vd6<70.0, wherein nd1, 2, nd3, nd4, nd5 and nd6 are refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, vd1, vd 639, 6862, nd 69556, nd 8253, the sixth lens, the fifth lens and the sixth lens, respectively, and the refractive indices of the fifth lens, the sixth lens, the fifth lens, the sixth lens, the fifth lens, the sixth lens, the fifth lens, the sixth lens, the fifth lens, the sixth lens, the fifth lens, the sixth lens, the fifth lens, the.
Preferably, the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the third lens, the fourth lens and the sixth lens is in the range of 0.45-0.85; the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens and the fifth lens is in the range of 1.6-2.1; the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the second lens is in the range of 2.5-2.9, so that the overall stability of the lens is improved, and good optical performance can be still maintained under a vibration environment.
Preferably, the object-side surface and the image-side surface of the second lens, the fourth lens and the fifth lens are 16-order even-order aspheric surfaces, which is beneficial to correcting second-order spectrum and high-order aberration.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that the overall performance is further improved.
Preferably, the fisheye lens further satisfies: TTL is less than 17.20mm, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and the total system length of the fisheye lens is further shortened.
The following describes the fisheye lens of the present invention in detail with specific embodiments.
Example one
As shown in fig. 1, a fisheye lens includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens element 1, a second lens element 2, a third lens element 3, a stop 7, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, a filter 8, a protective glass 9, and an image plane 100; the first lens element 1 to the sixth lens element 6 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, and an object-side surface 11 of the first lens element 1 is convex and an 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 concave and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a positive 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.
The fourth lens element 4 has a positive refractive index, and an object-side surface 41 and an image-side surface 42 of the fourth lens element 4 are convex and substantially parallel to each other.
The fifth lens element 5 has a negative 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 concave.
The sixth lens element 6 has a positive refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is convex.
The object- side surfaces 21, 41, 51 and the image- side surfaces 22, 42, 52 of the second lens 2, the fourth lens 4 and the fifth lens 5 are aspheric.
In this embodiment, the second lens 2, the fourth lens 4, and the fifth lens 5 are made of plastic materials, but not limited thereto, and in some embodiments, the second lens 2, the fourth lens 4, and the fifth lens 5 may also be made of other optical materials such as glass.
In this embodiment, the first lens 1, the third lens 3, and the sixth lens 6 are made of glass materials, but not limited thereto.
The filter 8 is used to filter out light to be filtered, such as an infrared filter.
In other embodiments, the diaphragm 7 may also be arranged between other lenses.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
In this embodiment, the object- side surfaces 21, 41, 51 and the image- side surfaces 22, 42, 52 are defined according to the following aspheric curve formula:
wherein:
r is the distance from a point on the optical surface to the optical axis.
z is the rise of this point in the direction of the optical axis.
c is the curvature of the surface.
K is the conic constant of the surface.
A4、A6、A8、A10、A12、A14、A16Respectively as follows: aspheric coefficients of fourth order, sixth order, eighth order, tenth order, twelfth order, fourteenth order and sixteenth order.
For details of parameters of each aspheric surface, please refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | 4.30 | -3.118E-03 | 7.745E-04 | 1.473E-04 | -7.396E-05 | 1.478E-05 | -1.481E-06 | 6.975E-08 |
| 22 | -1.03 | -8.471E-04 | 4.087E-04 | 2.948E-04 | -1.118E-04 | 1.919E-05 | -1.653E-06 | 6.519E-08 |
| 41 | 1.43 | -4.275E-03 | 2.150E-03 | -2.003E-03 | 8.752E-04 | -2.098E-04 | 2.463E-05 | -1.072E-06 |
| 42 | -7.84 | -1.209E-03 | 1.913E-03 | -2.281E-05 | 2.443E-06 | 7.321E-05 | -4.290E-05 | 9.361E-06 |
| 51 | -197.87 | -3.106E-02 | 1.303E-02 | -5.655E-03 | 1.613E-03 | -1.505E-04 | -5.594E-05 | 1.233E-05 |
| 52 | -6.35 | -8.618E-04 | 3.263E-03 | 1.412E-03 | -2.423E-03 | 1.277E-03 | -3.206E-04 | 3.219E-05 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 2, the defocusing curve chart is shown in detail in FIG. 3, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the imaging quality is good; the transverse chromatic aberration diagram and the longitudinal chromatic aberration diagram are detailed in fig. 4 and 5, and the chromatic aberration optimization is better; curvature of field and distortion referring to (a) and (B) of fig. 6, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the fisheye lens is 2.4 mm; f-number FNO 1.75; field angle FOV is 180.0 °; the diameter phi of the image plane is 6.6 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 17.10 mm.
The specific embodiment has small temperature drift, and reduces the influence of temperature disturbance on the imaging quality; the overall stability is good, and the good optical performance can be still kept under the vibration environment.
Example two
As shown in fig. 7, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | 4.38 | -3.064E-03 | 7.328E-04 | 1.072E-04 | -5.386E-05 | 1.079E-05 | -1.122E-06 | 5.811E-08 |
| 22 | -1.18 | -9.763E-04 | 3.760E-04 | 2.804E-04 | -1.121E-04 | 2.152E-05 | -2.276E-06 | 1.143E-07 |
| 41 | 1.42 | -4.464E-03 | 2.048E-03 | -2.006E-03 | 8.677E-04 | -2.128E-04 | 2.376E-05 | -1.176E-06 |
| 42 | -7.78 | -1.598E-03 | 1.571E-03 | -1.720E-04 | -3.346E-05 | 7.196E-05 | -4.177E-05 | 6.962E-06 |
| 51 | 200.00 | -3.157E-02 | 1.274E-02 | -5.783E-03 | 1.606E-03 | -1.579E-04 | -6.176E-05 | 1.299E-05 |
| 52 | -6.37 | -1.304E-03 | 3.133E-03 | 1.419E-03 | -2.415E-03 | 1.262E-03 | -3.108E-04 | 3.009E-05 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 8, the defocusing curve chart is shown in detail in FIG. 9, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the imaging quality is good; the transverse chromatic aberration diagram and the longitudinal chromatic aberration diagram are shown in detail in fig. 10 and 11, and the chromatic aberration optimization is better; curvature of field and distortion referring to (a) and (B) of fig. 12, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the fisheye lens is 2.4 mm; f-number FNO 1.75; field angle FOV is 180.0 °; the diameter phi of the image plane is 6.6 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 17.10 mm.
The specific embodiment has small temperature drift, and reduces the influence of temperature disturbance on the imaging quality; the overall stability is good, and the good optical performance can be still kept under the vibration environment.
EXAMPLE III
As shown in fig. 13, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | 4.38 | -3.065E-03 | 7.316E-04 | 1.069E-04 | -4.987E-05 | 9.188E-06 | -8.927E-07 | 4.685E-08 |
| 22 | -1.18 | -9.760E-04 | 3.764E-04 | 2.808E-04 | -1.118E-04 | 2.189E-05 | -2.496E-06 | 1.397E-07 |
| 41 | 1.42 | -4.464E-03 | 2.048E-03 | -2.006E-03 | 8.678E-04 | -2.128E-04 | 2.376E-05 | -1.178E-06 |
| 42 | -7.78 | -1.598E-03 | 1.571E-03 | -1.721E-04 | -3.355E-05 | 7.191E-05 | -4.177E-05 | 6.987E-06 |
| 51 | 199.98 | -3.157E-02 | 1.274E-02 | -5.783E-03 | 1.606E-03 | -1.578E-04 | -6.176E-05 | 1.298E-05 |
| 52 | -6.37 | -1.304E-03 | 3.133E-03 | 1.419E-03 | -2.415E-03 | 1.262E-03 | -3.107E-04 | 3.008E-05 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 14, the defocusing curve chart is shown in detail in FIG. 15, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the imaging quality is good; the transverse chromatic aberration diagram and the longitudinal chromatic aberration diagram are shown in detail in figures 16 and 17, and the chromatic aberration optimization is better; curvature of field and distortion referring to (a) and (B) of fig. 18, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the fisheye lens is 2.4 mm; f-number FNO 1.75; field angle FOV is 180.0 °; the diameter phi of the image plane is 6.6 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 17.10 mm.
The specific embodiment has small temperature drift, and reduces the influence of temperature disturbance on the imaging quality; the overall stability is good, and the good optical performance can be still kept under the vibration environment.
Example four
As shown in fig. 19, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | 4.38 | -3.065E-03 | 7.315E-04 | 1.066E-04 | -4.974E-05 | 9.301E-06 | -9.294E-07 | 4.964E-08 |
| 22 | -1.18 | -9.759E-04 | 3.764E-04 | 2.810E-04 | -1.116E-04 | 2.193E-05 | -2.538E-06 | 1.443E-07 |
| 41 | 1.42 | -4.464E-03 | 2.048E-03 | -2.006E-03 | 8.678E-04 | -2.128E-04 | 2.376E-05 | -1.178E-06 |
| 42 | -7.78 | -1.598E-03 | 1.571E-03 | -1.721E-04 | -3.355E-05 | 7.192E-05 | -4.176E-05 | 6.995E-06 |
| 51 | 199.98 | -3.157E-02 | 1.274E-02 | -5.783E-03 | 1.606E-03 | -1.579E-04 | -6.179E-05 | 1.295E-05 |
| 52 | -6.37 | -1.304E-03 | 3.133E-03 | 1.419E-03 | -2.414E-03 | 1.263E-03 | -3.101E-04 | 2.976E-05 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 20, the defocusing curve chart is shown in detail in FIG. 21, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the imaging quality is good; the transverse chromatic aberration diagram and the longitudinal chromatic aberration diagram are shown in detail in figures 22 and 23, and the chromatic aberration optimization is better; curvature of field and distortion referring to (a) and (B) of fig. 24, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the fisheye lens is 2.4 mm; f-number FNO 1.75; field angle FOV is 180.0 °; the diameter phi of the image plane is 6.6 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 17.08 mm.
The specific embodiment has small temperature drift, and reduces the influence of temperature disturbance on the imaging quality; the overall stability is good, and the good optical performance can be still kept under the vibration environment.
EXAMPLE five
As shown in fig. 25, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 5-1.
TABLE 5-1 detailed optical data for EXAMPLE V
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | K | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| 21 | 4.27 | -3.074E-03 | 8.025E-04 | 1.297E-04 | -6.768E-05 | 1.244E-05 | -1.086E-06 | 4.577E-08 |
| 22 | -1.19 | -9.975E-04 | 4.101E-04 | 2.880E-04 | -9.666E-05 | 8.968E-06 | 5.486E-07 | -9.409E-08 |
| 41 | 1.41 | -4.458E-03 | 2.038E-03 | -2.011E-03 | 8.656E-04 | -2.140E-04 | 2.405E-05 | -1.148E-06 |
| 42 | -7.79 | -1.597E-03 | 1.577E-03 | -1.736E-04 | -3.861E-05 | 7.219E-05 | -4.261E-05 | 7.595E-06 |
| 51 | -153.54 | -3.171E-02 | 1.274E-02 | -5.785E-03 | 1.606E-03 | -1.576E-04 | -6.301E-05 | 1.399E-05 |
| 52 | -6.32 | -1.305E-03 | 3.138E-03 | 1.418E-03 | -2.416E-03 | 1.269E-03 | -3.131E-04 | 3.024E-05 |
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 26, the defocusing curve chart is shown in detail in FIG. 27, it can be seen that the resolution is high, the central MTF value of the 250lp/mm spatial frequency is greater than 0.5, the edge MTF value is greater than 0.2, and the imaging quality is good; the transverse chromatic aberration diagram and the longitudinal chromatic aberration diagram are shown in detail in fig. 28 and 29, and the chromatic aberration optimization is better; curvature of field and distortion referring to (a) and (B) of fig. 30, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the fisheye lens is 2.4 mm; f-number FNO 1.75; field angle FOV is 180.0 °; the diameter phi of the image plane is 6.6 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 17.10 mm.
The specific embodiment has small temperature drift, and reduces the influence of temperature disturbance on the imaging quality; the overall stability is good, and the good optical performance can be still kept under the vibration environment.
Table 6 values of relevant important parameters of five embodiments of the present invention
| First embodiment | Second embodiment | Third embodiment | Fourth embodiment | Fifth embodiment | |
| f1 | -4.752 | -4.661 | -4.657 | -4.658 | -4.655 |
| f2 | -5.132 | -5.155 | -5.155 | -5.193 | -5.152 |
| f3 | 4.697 | 4.675 | 4.675 | 4.675 | 4.677 |
| f4 | 3.609 | 3.648 | 3.648 | 3.648 | 3.644 |
| f5 | -3.960 | -4.020 | -4.020 | -4.020 | -4.015 |
| f6 | 6.523 | 6.683 | 6.683 | 6.683 | 6.691 |
| f | 2.4 | 2.4 | 2.4 | 2.4 | 2.4 |
| f1/f | -1.98 | -1.94 | -1.94 | -1.94 | -1.94 |
| f2/f | -2.14 | -2.15 | -2.15 | -2.16 | -2.15 |
| f3/f | 1.96 | 1.95 | 1.95 | 1.95 | 1.95 |
| f4/f | 1.50 | 1.52 | 1.52 | 1.52 | 1.52 |
| f5/f | -1.65 | -1.68 | -1.68 | -1.68 | -1.67 |
| f6/f | 2.72 | 2.78 | 2.78 | 2.78 | 2.79 |
| T1 | 0.992 | 0.981 | 0.968 | 0.968 | 0.926 |
| T11 | 1.906 | 1.947 | 1.943 | 1.941 | 1.920 |
| T11/T1 | 1.921 | 1.985 | 2.007 | 2.005 | 2.073 |
| T2 | 0.632 | 0.600 | 0.600 | 0.600 | 0.603 |
| T21 | 1.780 | 1.717 | 1.710 | 1.727 | 1.746 |
| T21/T2 | 2.816 | 2.862 | 2.850 | 2.878 | 2.896 |
| T3 | 3.146 | 3.139 | 3.139 | 3.139 | 3.150 |
| T31 | 2.546 | 2.530 | 2.531 | 2.539 | 2.523 |
| T31/T3 | 0.809 | 0.806 | 0.806 | 0.809 | 0.801 |
| T4 | 1.784 | 1.839 | 1.839 | 1.839 | 1.838 |
| T41 | 1.041 | 1.084 | 1.084 | 1.090 | 1.083 |
| T41/T4 | 0.584 | 0.589 | 0.589 | 0.593 | 0.589 |
| T5 | 0.628 | 0.631 | 0.631 | 0.631 | 0.638 |
| T51 | 1.015 | 1.012 | 1.012 | 1.013 | 1.008 |
| T51/T5 | 1.616 | 1.604 | 1.604 | 1.605 | 1.580 |
| T6 | 1.894 | 1.812 | 1.812 | 1.812 | 1.816 |
| T61 | 0.884 | 0.875 | 0.885 | 0.873 | 0.909 |
| T61/T6 | 0.467 | 0.483 | 0.488 | 0.482 | 0.501 |
Wherein T1, T2, T3, T4, T5 and T6 are thicknesses of center of the lenses of the first to sixth lenses, respectively, and T11, T21, T31, T41, T51 and T61 are thicknesses of edges of the lenses of the first to sixth lenses, respectively.
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 comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
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 concave object-side surface and a concave image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex 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 negative refractive index has a convex object-side surface and a concave image-side surface;
the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
the object side surface and the image side surface of the second lens, the fourth lens and the fifth lens are aspheric surfaces;
the lens with the refractive index of the fisheye lens only comprises the first lens, the second lens and the sixth lens.
2. The fisheye lens of claim 1, wherein: the second lens, the fourth lens and the fifth lens are all made of plastic materials, and the first lens, the third lens and the sixth lens are all made of glass materials.
3. The fisheye lens of claim 1, further satisfying: -5mm < f1< -4mm, -6mm < f2< -5mm, 4mm < f3<5mm, 3mm < f4<4mm, -5mm < f5< -3mm, 6mm < f6<7mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
4. The fisheye lens of claim 1, further satisfying: -3< (f1/f) < -1, -3< (f2/f) < -1, 1< (f3/f) <3, 1< (f4/f) <3, -3< (f5/f) < -1, 1< (f6/f) <3, wherein f is the focal length of the fisheye lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.
5. The fisheye lens of claim 1, further satisfying: 13mm < R11<15mm, 2mm < R12<4mm, -7mm < R21< -5mm, 4mm < R22<5mm, 6mm < R31<8mm, -9mm < R32< -7mm, 3mm < R41<5mm, -4mm < R42< -3mm, 500mm < R51<1200mm, 2mm < R52<3.5mm, 6mm < R61<9mm, -9mm < R62< -7mm, wherein, R11 and R12 are radii of curvature of the object-side surface and the image-side surface of the first lens element, R21 and R22 are radii of curvature of the object-side surface and the image-side surface of the second lens element, R31 and R32 are radii of curvature of the object-side surface and the image-side surface of the third lens element, R41 and R42 are radii of curvature of the object-side surface and the image-side surface of the fourth lens element, R51 and R52 are radii of curvature of the object-side surface and the image-side surface of the fifth lens element, and R61 and R62 are radii of curvature of the object-side surface and the image-side surface of the sixth lens element, respectively.
6. The fisheye lens of claim 1, further satisfying: 1.7< nd1<1.9, 40.0< vd1<50.0, 1.5< nd2<1.7, 50.0< vd2<60.0, 1.8< nd3<2.0, 35.0< vd3<45.0, 1.5< nd4<1.6, 50.0< vd4<60.0, 1.6< nd5<1.8, 15.0< vd5<23.0, 1.5< nd6<1.7, 50.0< vd6<70.0, wherein nd1, 2, nd3, nd4, nd5 and nd6 are the refractive indices of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens, and the refractive indices of the nd1, vd 639, 6862, nd 69556, nd 8253, the fourth lens, the fifth lens and the sixth lens are the refractive indices of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens, the fifth lens, the.
7. The fisheye lens of claim 1, wherein: the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the third lens, the fourth lens and the sixth lens is in the range of 0.45-0.85; the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens and the fifth lens is in the range of 1.6-2.1; the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the second lens is in the range of 2.5-2.9.
8. The fisheye lens of claim 1, wherein: the object side surface and the image side surface of the second lens, the fourth lens and the fifth lens are all 16-order even-order aspheric surfaces.
9. The fisheye lens of claim 1, wherein: the diaphragm is arranged between the third lens and the fourth lens.
10. The fisheye lens of claim 1, further satisfying: TTL <17.20mm, wherein TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.
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| CN112649947A (en) * | 2021-01-19 | 2021-04-13 | 厦门力鼎光电股份有限公司 | Fisheye lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112649947A (en) * | 2021-01-19 | 2021-04-13 | 厦门力鼎光电股份有限公司 | Fisheye lens |
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