CN111781716A

CN111781716A - Glass-plastic mixed fisheye lens

Info

Publication number: CN111781716A
Application number: CN202010805157.7A
Authority: CN
Inventors: 曹来书; 张瑞翔; 黄立权
Original assignee: Xiamen Leading Optics Co Ltd
Current assignee: Xiamen Leading Optics Co Ltd
Priority date: 2020-08-12
Filing date: 2020-08-12
Publication date: 2020-10-16
Anticipated expiration: 2040-08-12
Also published as: CN111781716B

Abstract

The invention relates to the technical field of lenses. The invention discloses a glass-plastic mixed fisheye lens, which comprises six lenses; the first lens is a convex-concave lens with negative refractive index; the second lens is a convex-concave or concave-concave lens with negative refractive index; the third lens element has positive refractive index and a convex object-side surface; the fourth lens is a concave lens with negative refractive index; the fifth lens and the sixth lens are both convex lenses with positive refractive index; the object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued. The invention has short total length and low cost; the resolution ratio is high, and the imaging quality is good; the image surface is large; good confocal property of visible light and infrared light.

Description

Glass-plastic mixed fisheye lens

Technical Field

The invention belongs to the technical field of lenses, and particularly relates to a glass-plastic mixed fisheye 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, 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 market at present has many defects, such as the use of all-glass lens mostly results in higher cost; the total length of the lens system is larger and is generally larger than 13 mm; the image surface is smaller and less than 5 mm; the lens with a smaller size and a larger image plane, which has poor infrared confocal performance, cannot meet the increasing requirements, and needs to be improved.

Disclosure of Invention

The invention aims to provide a glass-plastic mixed fisheye lens for solving the existing technical problems.

In order to achieve the purpose, the invention adopts the technical scheme that: a glass-plastic mixed fisheye lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fourth lens, wherein the first lens, the second lens and the third lens are arranged 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 convex or concave object-side surface and a concave image-side surface;

the third lens element has positive refractive index, and the object-side surface of the third lens element is convex;

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 convex image-side surface;

the object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces; the second lens and the sixth lens are made of plastic materials, the first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued;

the lens with the refractive index of the glass-plastic mixed fisheye lens is only the first lens to the sixth lens.

Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.

Furthermore, the image side surface of the third lens is a plane.

Further, this mixed fisheye camera lens is moulded to glass still satisfies: D12/R12 is not more than 1.87, wherein D12 is the clear aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.

Further, this mixed fisheye camera lens is moulded to glass still satisfies: -2.5< (f1/f) < -2, -2< (f2/f) < -1, 1< (f3/f) <2, 5.5< (f45/f) <9, 2< (f6/f) <3, wherein f is the focal length of the glass-plastic hybrid 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, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens.

Further, this mixed fisheye camera lens is moulded to glass still satisfies: vd5-vd4>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.

Further, the glass-plastic mixed fisheye lens further satisfies the following conditions: 1.45< nd1<1.85, 46< vd1< 72; 1.45< nd2<1.6, 55< vd2< 57; 1.7< nd3 is less than or equal to 2.0, 15< vd3 is less than 25; 1.7< nd4<2.0, 15< vd4< 25; 1.65< nd5<1.80, 50< vd5< 60; 1.45< nd6<1.6, 55< vd6<57, where nd1, nd2, 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, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are dispersion coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively.

Further, the object-side surface and the image-side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces.

Further, this mixed fisheye camera lens is moulded to glass still satisfies: ALT/ALG is less than or equal to 1.13 and less than or equal to 1.17, wherein ALG is the sum of air gaps between the first lens and the imaging surface on the optical axis, and ALT is the sum of six lens thicknesses between the first lens and the sixth lens on the optical axis.

The invention has the beneficial technical effects that:

the invention adopts six lenses and glass-plastic mixed design, and has low cost; the total length is short, and the installation and the use are convenient; the resolution ratio is high, and the imaging quality is good; the image surface is larger; good confocal property of visible light and infrared 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 introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;

FIG. 2 is a graph of MTF of 0.436-0.656 μm in visible light according to the first embodiment of the present invention;

FIG. 3 is a MTF plot of 0.850 μm infrared in accordance with a first embodiment of the present invention;

FIG. 4 is a defocus plot of 0.436-0.656 μm visible light according to the first embodiment of the present invention;

FIG. 5 is a defocus plot of 0.850 μm infrared in accordance with the first embodiment of the present invention;

FIG. 6 is a diagram illustrating field curvature and distortion curves according to a first embodiment of the present invention;

FIG. 7 is a contrast plot of 0.546 μm visible light according to the first embodiment of the present invention;

FIG. 8 is a schematic structural diagram according to a second embodiment of the present invention;

FIG. 9 is a graph of MTF of 0.436-0.656 μm in visible light according to example two of the present invention;

FIG. 10 is an MTF plot at 0.850 μm in the infrared for example two of the present invention;

FIG. 11 is a defocus plot of 0.436-0.656 μm in visible light according to example two 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 graph showing field curvature and distortion curves of a second embodiment of the present invention;

FIG. 14 is a contrast plot of 0.546 μm visible light for example two 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 0.436-0.656 μm in visible light according to example III of the present invention;

FIG. 17 is a MTF plot at 0.850 μm in the infrared for example III of the present invention;

FIG. 18 is a defocus graph of 0.436-0.656 μm in visible light according to example III 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 graph showing field curvature and distortion curves of a third embodiment of the present invention;

FIG. 21 is a contrast plot of 0.546 μm visible light for example three according to the present invention;

FIG. 22 is a schematic structural diagram according to a fourth embodiment of the present invention;

FIG. 23 is a graph of MTF at 0.436-0.656 μm in visible light according to example four of the present invention;

FIG. 24 is a graph of the MTF at 0.850 μm in the infrared for example four of the present invention;

FIG. 25 is a defocus graph of 0.436-0.656 μm in visible light according to example four of the present invention;

FIG. 26 is a defocus plot of 0.850 μm infrared in accordance with the fourth embodiment of the present invention;

FIG. 27 is a graph showing field curvature and distortion curves of a fourth embodiment of the present invention;

FIG. 28 is a contrast plot of 0.546 μm visible light for example four of the present invention;

FIG. 29 is a schematic structural diagram according to a fifth embodiment of the present invention;

FIG. 30 is a graph of MTF at 0.436-0.656 μm in visible light according to example V of the present invention;

FIG. 31 is a MTF plot at 0.850 μm in the infrared for example five of the present invention;

FIG. 32 is a defocus graph of 0.436-0.656 μm in visible light according to example V of the present invention;

FIG. 33 is a defocus plot of 0.850 μm infrared for example five of the present invention;

FIG. 34 is a graph showing field curvature and distortion curves of example five of the present invention;

FIG. 35 is a contrast plot of 0.546 μm visible light for example five of the present invention;

FIG. 36 is a schematic structural diagram of a sixth embodiment of the present invention;

FIG. 37 is a graph of MTF at 0.436-0.656 μm in visible light according to sixth embodiment of the present invention;

FIG. 38 is a graph of the MTF at 0.850 μm in the infrared for example six of the present invention;

FIG. 39 is a defocus graph of 0.436-0.656 μm in visible light according to a sixth embodiment of the present invention;

FIG. 40 is a defocus plot of 0.850 μm infrared for example six of the present invention;

FIG. 41 is a graph showing field curvature and distortion curves of a sixth embodiment of the present invention;

FIG. 42 is a graph of the relative luminance of 0.546 μm in visible light according to a sixth embodiment of the present invention.

Detailed Description

To further illustrate the various embodiments, the 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. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The 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 invention provides a glass-plastic mixed fisheye lens which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; 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 convex or concave object-side surface and a concave image-side surface.

The third lens element has a positive refractive index, and the object-side surface of the third lens element is convex.

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 convex object-side surface and a convex image-side surface.

The object side surface and the image side surface of the second lens and the sixth lens are both aspheric surfaces; the second lens and the sixth lens are made of plastic materials, namely the second lens and the sixth lens are plastic aspheric lenses, so that the cost is low, aberrations such as spherical aberration, coma, field curvature and astigmatism can be better corrected, and the MTF image quality is improved; meanwhile, the temperature drift of the lens base is compensated, and the imaging can be clear at the high and low temperature of minus 40-85 ℃.

The first lens, the third lens, the fourth lens and the fifth lens are made of glass materials, and the fourth lens and the fifth lens are mutually glued, so that aberrations such as spherical aberration and chromatic aberration can be corrected, and the MTF resolution can be improved.

The lens with the refractive index of the glass-plastic mixed fisheye lens is only the first lens to the sixth lens. The invention adopts six lenses and glass-plastic mixed design, and has low cost; the total length is short, and the installation and the use are convenient; the resolution ratio is high, and the imaging quality is good; the image surface is larger; good confocal property of visible light and infrared light.

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.

More preferably, the image side surface of the third lens is a plane, so that the diaphragm interval controls a small interval tolerance conveniently, the three lenses in front of the diaphragm can be assembled at a small inclination tolerance conveniently, and the product yield is improved.

Preferably, this glass is moulded and is mixed fisheye lens still satisfies: D12/R12 is not more than 1.87, wherein D12 is the clear aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens, so that the process is convenient on the premise of realizing the low f-theta distortion function.

Preferably, this glass is moulded and is mixed fisheye lens still satisfies: -2.5< (f1/f) < -2, -2< (f2/f) < -1, 1< (f3/f) <2, 5.5< (f45/f) <9, 2< (f6/f) <3, wherein f is the focal length of the glass-plastic hybrid 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, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens, so that the process sensitivity is reduced, and the product yield is improved.

Preferably, this glass is moulded and is mixed fisheye lens still satisfies: vd5-vd4>30, wherein vd4 is the abbe number of the fourth lens and vd5 is the abbe number of the fifth lens, further correcting chromatic aberration.

More preferably, the glass-plastic hybrid fisheye lens further satisfies: 1.45< nd1<1.85, 46< vd1< 72; 1.45< nd2<1.6, 55< vd2< 57; 1.7< nd3 is less than or equal to 2.0, 15< vd3 is less than 25; 1.7< nd4<2.0, 15< vd4< 25; 1.65< nd5<1.80, 50< vd5< 60; 1.45< nd6<1.6, 55< vd6<57, wherein nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, and vd1, vd2, vd3, vd4, vd5 and vd6 are dispersion coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, so that better confocal performance of visible light and infrared light can be realized.

Preferably, the object-side surface and the image-side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces, which is beneficial to correcting secondary spectrum and high-order aberration.

Preferably, this glass is moulded and is mixed fisheye lens still satisfies: ALT/ALG is less than or equal to 1.13 and less than or equal to 1.17, wherein ALG is the sum of air gaps between the first lens and the imaging surface on the optical axis, and ALT is the sum of six lens thicknesses between the first lens and the sixth lens on the optical axis.

The glass-plastic hybrid fisheye lens of the invention will be described in detail with specific examples.

Example one

As shown in fig. 1, a glass-plastic hybrid 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 protective glass 8, and an image plane 9; 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, the object-side surface 31 of the third lens element 3 is a convex surface, and the image-side surface 32 of the third lens element 3 is a flat surface.

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 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, 61 and the image side surfaces 22, 62 of the second lens 2 and the sixth lens 6 are aspheric; the second lens 2 and the sixth lens 6 are made of a plastic material.

The first lens 1, the third lens 3, the fourth lens 4 and the fifth lens 5 are made of glass materials, and the fourth lens 4 and the fifth lens 5 are mutually glued.

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, 61 and the image-

side surfaces

22, 62 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	21	22	61	62
					k＝	-2.6473E+01	-3.2797E+01	-2.7078E-02	3.2580E-14
A₄＝	3.4334E-02	1.6685E-01	-9.6696E-05	5.9008E-03
					A₆＝	-1.3595E-02	-1.1503E-01	-1.4175E-03	-2.7081E-03
A₈＝	2.7089E-03	1.0651E-01	1.6379E-03	1.8945E-03
					A₁₀＝	-2.2255E-04	-7.7493E-02	-9.0133E-04	-6.9613E-04
A₁₂＝	0.0000E+00	3.4533E-02	2.6048E-04	1.4559E-04
					A₁₄＝	0.0000E+00	-7.2339E-03	-3.9112E-05	-1.6804E-05
A₁₆＝	0.0000E+00	4.1023E-04	2.3964E-06	8.1184E-07

Please refer to table 7 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 FIGS. 2 and 3, and it can be seen that the resolution of visible light and infrared is high and the imaging quality is excellent; the focal curves are shown in detail in fig. 4 and 5, and it can be seen that the 850nm infrared offset IR shift is less than 10 μm, and the confocal performance of visible light and infrared is good; referring to (a) and (B) of fig. 6, it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 10%; referring to fig. 7, it can be seen that the relative illuminance is higher.

In the specific embodiment, the focal length f of the glass-plastic mixed fisheye lens is 1.95 mm; f-number FNO 2.28; field angle FOV is 180 °; the diameter phi of the image plane is 5.590 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image forming surface 9 on the optical axis I is 12.20 mm.

The specific embodiment has small temperature drift and can realize clear imaging at the temperature of-40-85 ℃.

Carry out two

As shown in fig. 8, 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 32 of the third lens element 3 is a convex surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element 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	21	22	61	62
					k＝	-1.8776E+01	-5.0242E+01	-2.7078E-02	3.2580E-14
A₄＝	3.4596E-02	1.7392E-01	-3.3709E-04	6.2674E-03
					A₆＝	-1.4101E-02	-1.3728E-01	-2.1378E-03	-3.6646E-03
A₈＝	2.9275E-03	1.4748E-01	2.3025E-03	2.6422E-03
					A₁₀＝	-2.4936E-04	-1.2480E-01	-1.2146E-03	-1.0636E-03
A₁₂＝	0.0000E+00	6.6774E-02	3.5345E-04	2.5740E-04
					A₁₄＝	0.0000E+00	-1.8846E-02	-5.4538E-05	-3.4696E-05
A₁₆＝	0.0000E+00	2.1031E-03	3.4860E-06	1.9810E-06

The MTF transfer function curve chart of the specific embodiment is shown in detail in FIGS. 9 and 10, and it can be seen that the resolution of visible light and infrared is high and the imaging quality is excellent; the focal curves are shown in detail in fig. 11 and 12, and it can be seen that the 850nm infrared offset IR shift is less than 10 μm, and the confocal performance of visible light and infrared is good; referring to (a) and (B) of fig. 13, it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 10%; referring to fig. 14, it can be seen that the relative illuminance is higher.

In the specific embodiment, the focal length f of the glass-plastic mixed fisheye lens is 1.95 mm; f-number FNO 2.28; field angle FOV is 180 °; the diameter phi of the image plane is 5.586 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image forming surface 9 on the optical axis I is 12.20 mm.

Implementation III

As shown in fig. 15, 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 32 of the third lens element 3 is a convex surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the 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

The MTF transfer function curve chart of the specific embodiment is shown in detail in FIGS. 16 and 17, and it can be seen that the resolution of visible light and infrared is high and the imaging quality is excellent; the focal curves are shown in detail in fig. 18 and 19, and it can be seen that the 850nm infrared offset IR shift is less than 10 μm, and the confocal performance of visible light and infrared is good; referring to (a) and (B) of fig. 20, it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 10%; referring to fig. 21, it can be seen that the relative illuminance is higher.

In the specific embodiment, the focal length f of the glass-plastic mixed fisheye lens is 1.95 mm; f-number FNO 2.27; field angle FOV is 180 °; the diameter phi of the image plane is 5.596 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image forming surface 9 on the optical axis I is 12.20 mm.

Practice four

As shown in fig. 22, 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 4-1.

TABLE 4-1 detailed optical data for example four

surface of	21	22	61	62
					k＝	-2.58933E+01	-4.23031E+00	-3.35636E-02	-1.06293E-02
A₄＝	3.81714E-02	2.17880E-01	-1.02323E-03	5.43517E-03
					A₆＝	-1.60837E-02	-2.35877E-01	-7.03454E-04	-2.23837E-03
A₈＝	3.32047E-03	2.87222E-01	1.07425E-03	1.68636E-03
					A₁₀＝	-2.81075E-04	-2.50649E-01	-6.45361E-04	-6.66409E-04
A₁₂＝	-2.21715E-07	1.34752E-01	1.99011E-04	1.54835E-04
					A₁₄＝	-2.78939E-08	-3.90096E-02	-3.20691E-05	-2.03266E-05
A₁₆＝	4.66221E-08	4.64867E-03	2.10253E-06	1.12006E-06

The MTF transfer function curve chart of the specific embodiment is shown in detail in FIGS. 23 and 24, and it can be seen that the resolution of visible light and infrared is high and the imaging quality is excellent; the focal curves are shown in detail in fig. 25 and 26, and it can be seen that the 850nm infrared offset IR shift is less than 10 μm, and the confocal performance of visible light and infrared is good; referring to (a) and (B) of fig. 27, it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 10%; referring to fig. 28, it can be seen that the relative illuminance is higher.

In the specific embodiment, the focal length f of the glass-plastic mixed fisheye lens is 1.95 mm; f-number FNO 2.27; field angle FOV is 180 °; the diameter phi of the image plane is 5.594 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image forming surface 9 on the optical axis I is 12.20 mm.

Practice five

As shown in fig. 29, the surface convexoconcave and the refractive index of each lens element of the present embodiment are substantially the same as those of the first embodiment, only the image-side surface 32 of the third lens element 3 is a convex surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness 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

surface of	21	22	61	62
					k＝	-1.87756E+01	-5.02419E+01	-2.70775E-02	3.25797E-14
A₄＝	3.45965E-02	1.73916E-01	-3.37091E-04	6.26744E-03
					A₆＝	-1.41006E-02	-1.37281E-01	-2.13777E-03	-3.66459E-03
A₈＝	2.92750E-03	1.47479E-01	2.30255E-03	2.64221E-03
					A₁₀＝	-2.49361E-04	-1.24802E-01	-1.21462E-03	-1.06360E-03
A₁₂＝	0.00000E+00	6.67741E-02	3.53455E-04	2.57400E-04
					A₁₄＝	0.00000E+00	-1.88461E-02	-5.45380E-05	-3.46956E-05
A₁₆＝	0.00000E+00	2.10309E-03	3.48597E-06	1.98103E-06

The MTF transfer function graph of the present embodiment is shown in detail in fig. 30 and 31, and it can be seen that the resolution of visible light and infrared is high, and the imaging quality is excellent; the focal curves are shown in detail in fig. 32 and 33, and it can be seen that the 850nm infrared offset IR shift is less than 10 μm, and the confocal performance of visible light and infrared is good; referring to fig. 34 (a) and (B), it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 10%; referring to fig. 35, it can be seen that the relative illuminance is higher.

EXAMPLE VI

As shown in fig. 36, the surface convexoconcave and the refractive index of each lens element of the present embodiment are substantially the same as those of the first embodiment, only the object-side surface 21 of the first lens element 1 is a convex surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.

The detailed optical data of this embodiment is shown in Table 6-1.

TABLE 6-1 detailed optical data for example six

surface of	21	22	61	62
					k＝	-2.17193E+00	-2.60432E+00	-9.94394E+00	1.22399E-01
A₄＝	6.21669E-04	9.29516E-02	8.65176E-03	7.96018E-03
					A₆＝	-2.38163E-03	-7.32120E-02	-2.57012E-03	-1.55181E-03
A₈＝	1.17110E-03	1.16134E-01	2.79241E-03	1.05688E-03
					A₁₀＝	-1.37743E-04	-1.15214E-01	-1.88493E-03	-2.39704E-04
A₁₂＝	-9.59563E-05	6.73859E-02	6.52229E-04	-2.15711E-05
					A₁₄＝	3.68935E-05	-2.07926E-02	-1.10260E-04	1.65049E-05
A₁₆＝	-3.83692E-06	2.63624E-03	7.21866E-06	-1.76575E-06

The MTF transfer function graph of the present embodiment is detailed in fig. 37 and 38, and it can be seen that the resolution of visible light and infrared is high, and the imaging quality is excellent; the focal curves are shown in detail in fig. 39 and 40, and it can be seen that the 850nm infrared offset IR shift is less than 10 μm, and the confocal performance of visible light and infrared is good; referring to fig. 41 (a) and (B), it can be seen that the field curvature and distortion are better corrected, and the absolute value of F-Theta distortion is less than 10%; referring to fig. 42, it can be seen that the relative illuminance is higher.

In the specific embodiment, the focal length f of the glass-plastic mixed fisheye lens is 1.95 mm; the f-number FNO is 2.24; field angle FOV is 180 °; the diameter phi of the image plane is 5.560 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image forming surface 9 on the optical axis I is 12.20 mm.

TABLE 7 values of relevant important parameters for six embodiments of the invention

	First embodiment	Second embodiment	Third embodiment	Fourth embodiment	Fifth embodiment	Sixth embodiment
							f1	-4.11	-4.18	-4.32	-4.32	-4.18	-5.35
f2	-3.73	-3.69	-3.63	-3.63	-3.69	-3.89
							f3	3.05	2.94	2.98	2.98	2.94	3.81
f45	12.76	16.23	14.78	14.01	16.23	10.83
							f6	4.79	4.78	4.80	4.80	4.78	4.84
f	1.95	1.95	1.95	1.95	1.95	1.95
							∣f1/f∣	-2.11	-2.14	-2.22	-2.22	-2.14	-2.74
∣f2/f∣	-1.91	-1.89	-1.86	-1.86	-1.89	-1.99
							∣f3/f∣	1.56	1.51	1.53	1.53	1.51	1.95
∣f45/f∣	6.54	8.32	7.58	7.18	8.32	5.55
							∣f6/f∣	2.46	2.45	2.46	2.46	2.45	2.48
vd4-vd5	34.39	34.39	34.39	34.39	34.39	34.39
							ALT	6.13	6.13	6.10	6.20	6.13	6.15
ALG	5.37	5.37	5.4	5.3	5.37	5.34
							ALT/ALG	1.14	1.14	1.13	1.17	1.14	1.15
D12	4.02	3.99	4.08	4.02	3.99	4.28
							R12	2.151	2.140	2.203	2.152	2.140	2.336
D12/R12	1.87	1.86	1.85	1.87	1.86	1.83

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

1. The utility model provides a glass is moulded and is mixed fisheye camera lens which 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;

2. The glass-plastic hybrid fisheye lens of claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.

3. The glass-plastic hybrid fisheye lens of claim 2, characterized in that: the image side surface of the third lens is a plane.

4. The glass-plastic hybrid fisheye lens of claim 1, characterized in that it further satisfies: D12/R12 is not more than 1.87, wherein D12 is the clear aperture of the image side surface of the first lens, and R12 is the curvature radius of the image side surface of the first lens.

5. The glass-plastic hybrid fisheye lens of claim 1, characterized in that it further satisfies: -2.5< (f1/f) < -2, -2< (f2/f) < -1, 1< (f3/f) <2, 5.5< (f45/f) <9, 2< (f6/f) <3, wherein f is the focal length of the glass-plastic hybrid 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, f6 is the focal length of the sixth lens, and f45 is the combined focal length of the fourth lens and the fifth lens.

6. The glass-plastic hybrid fisheye lens of claim 1, characterized in that it further satisfies: vd5-vd4>30, where vd4 is the Abbe number of the fourth lens and vd5 is the Abbe number of the fifth lens.

7. The glass-plastic hybrid fisheye lens of claim 6, characterized in that it further satisfies: 1.45< nd1<1.85, 46< vd1< 72; 1.45< nd2<1.6, 55< vd2< 57; 1.7< nd3 is less than or equal to 2.0, 15< vd3 is less than 25; 1.7< nd4<2.0, 15< vd4< 25; 1.65< nd5<1.80, 50< vd5< 60; 1.45< nd6<1.6, 55< vd6<57, where nd1, nd2, 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, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are dispersion coefficients of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens, respectively.

8. The glass-plastic hybrid fisheye lens of claim 1, characterized in that: the object side surface and the image side surface of the second lens and the sixth lens are both 16-order even-order aspheric surfaces.

9. The glass-plastic hybrid fisheye lens of claim 1, characterized in that it further satisfies: ALT/ALG is less than or equal to 1.13 and less than or equal to 1.17, wherein ALG is the sum of air gaps between the first lens and the imaging surface on the optical axis, and ALT is the sum of six lens thicknesses between the first lens and the sixth lens on the optical axis.