CN210142231U - Fisheye lens - Google Patents

Abstract

The utility model relates to a fish-eye lens, which comprises a lens group; the lens group includes: a first lens 1, a second lens 2, a third lens 3, a diaphragm S, a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged in this order from the object side to the image side along the optical axis; the first lens 1, the second lens 2 and the fifth lens 5 are negative focal power lenses; the third lens 3, the fourth lens 4 and the sixth lens 6 are positive focal power lenses; the first lens 1 is a meniscus lens; the second lens 2 is a biconcave lens; the third lens 3 is a biconvex lens; the fourth lens 4 is a biconvex lens; the fifth lens 5 is a biconcave lens; the sixth lens 6 is a biconvex lens. The lens further comprises a seventh lens 7 arranged close to the object side of the lens group; the seventh lens 7 is a meniscus negative power lens. The utility model discloses a fisheye lens can realize good formation of image effect, acquires more sharply, and when the visual information that resolution ratio is higher, the environmental suitability of reinforcing fisheye lens increases substantially.

Description

Fisheye lens

Technical Field

The utility model relates to an optical imaging field especially relates to a fisheye lens.

Background

The performance of the lens, which is a main component of the imaging device system, determines the strength of the imaging device's ability to acquire visual information. With the rapid expansion of the application range of the imaging device, higher requirements are put forward on the aspects of the resolution power, the light transmission quantity, the high and low temperature performance, the day and night confocal performance and the environmental adaptability of the lens.

The currently used fisheye lens has the following defects: the imaging lens has the advantages of difficult pixel improvement, low imaging picture sharpness, small aperture and small visual field range, but the larger aperture of the fisheye lens also means that the light transmission aperture is larger, so that the aberration is rapidly deteriorated, and the requirements of large visual field, day and night confocal property, high and low temperature non-virtual focus and high resolution power cannot be simultaneously met.

Disclosure of Invention

An object of the utility model is to solve above-mentioned problem, provide a fisheye lens.

In order to achieve the above object, the present invention provides a fisheye lens, which comprises a lens group;

the lens group includes: the lens assembly comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from an object side to an image side along an optical axis;

the first lens, the second lens and the fifth lens are negative focal power lenses;

the third lens, the fourth lens and the sixth lens are positive focal power lenses; it is characterized in that the preparation method is characterized in that,

the first lens is a meniscus lens;

the second lens is a biconcave lens;

the third lens is a biconvex lens;

the fourth lens is a biconvex lens;

the fifth lens is a biconcave lens;

the sixth lens is a biconvex lens.

According to an aspect of the present invention, the fourth lens and the fifth lens constitute a cemented lens group having negative power.

According to an aspect of the present invention, the liquid crystal display device further includes a seventh lens disposed on the object side near the lens group;

the seventh lens is a meniscus lens and is a negative power lens.

According to an aspect of the present invention, a ratio of R values of the object side surface and the image side surface of the seventh lens satisfies: 1 < S1/S2 < 1.5.

According to an aspect of the present invention, the seventh lens, the first lens and the third lens are spherical lenses;

the second lens, the fourth lens, the fifth lens and the sixth lens are glass aspheric lenses or plastic aspheric lenses.

According to the utility model discloses an aspect, the half image height h of camera lens with the effective focal length f of camera lens satisfies the relational expression: f/h is more than or equal to 0.5.

According to the utility model discloses an aspect, camera lens back focal length d with the effective focal length f of camera lens satisfies the relational expression: d/f is more than or equal to 1.4.

According to an aspect of the present invention, the focal length f7 of the seventh lens and the combined focal length Fn of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens satisfy: | f7| > | Fn |.

According to an aspect of the present invention, the focal lengths of the first lens and the second lens are f1 and f2, respectively, and satisfy: 5 is more than or equal to f1/f2 is more than or equal to 1.

According to an aspect of the present invention, the focal lengths of the fourth lens and the fifth lens are f4 and f5, respectively, and satisfy: -0.5. gtoreq.f 4/f 5. gtoreq.3.

According to an aspect of the present invention, the focal lengths of the third lens and the sixth lens are f3 and f6, respectively, and satisfy: 2.5 is more than or equal to f3/f6 is more than or equal to 0.3.

According to an aspect of the present invention, the abbe number vd4 of the fourth lens and the abbe number vd5 of the fifth lens satisfy the following relation: vd 4-Vd 5 is more than or equal to 30.

According to the utility model discloses a scheme, the utility model discloses a camera lens can satisfy the object distance and clearly image at 0.1m to infinity object distance within range to realize satisfying the day night sharing on the basis of F1.2 big light ring simultaneously, expanded service environment's restriction when increasing the luminous flux. In addition the utility model discloses a full field of view scope of camera lens can reach 240 at utmost.

According to the utility model discloses a scheme, the utility model discloses a reasonable control light path trend also guarantees that optical system's sensitivity is lower when realizing that design imaging performance is excellent, can satisfy the camera lens machining tolerance requirement.

According to the utility model discloses a scheme, through optimizing each lens diopter of configuration and chooseing for use reasonable material, also make the utility model discloses the lens aberration obtains effectual correction, has overcome the lens material simultaneously because coefficient of expansion is big, causes the defect of focus drift easily under high low temperature environment, makes the utility model discloses the camera lens is at-40 ℃ -85 ℃ of temperature within range formation of image clearly.

According to the utility model discloses a scheme makes the mould through the aspheric surface lens that uses the high accuracy, can also be when reaching the design tolerance margin, guaranteeing actual camera lens performance, can guarantee again to make the uniformity of quality in batches.

Drawings

Fig. 1 is a view schematically showing a configuration of a fisheye lens according to a first embodiment of the present invention;

fig. 2 is a MTF diagram schematically showing 200lp/mm of the fisheye lens according to the first embodiment of the present invention at a normal temperature of 20 degrees under visible light;

FIG. 3 is a MTF graph schematically showing 200lp/mm of the fisheye lens according to the first embodiment of the present invention at 20 degrees at normal temperature and at night;

FIG. 4 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a first embodiment of the invention at a normal temperature of 20 degrees and under visible light of 1001 p/mm;

FIG. 5 is a diagram schematically illustrating a Through-Focus-MTF of a fisheye lens at 100lp/mm at low temperature of-40 degrees under visible light according to a first embodiment of the invention;

FIG. 6 is a Through-Focus-MTF graph schematically showing a fisheye lens according to a first embodiment of the invention at a high temperature of 85 degrees and under visible light of 100 lp/mm;

fig. 7 is a view schematically showing a configuration of a fisheye lens according to a second embodiment of the present invention;

fig. 8 is a MTF chart schematically showing 200lp/mm under visible light at a normal temperature of 20 degrees in a fisheye lens according to a second embodiment of the present invention;

fig. 9 is an MTF chart schematically showing 200lp/mm at a normal temperature of 20 degrees and at night in the infrared of the fisheye lens according to the second embodiment of the present invention;

FIG. 10 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a second embodiment of the present invention at a normal temperature of 20 degrees and under visible light of 1001 p/mm;

FIG. 11 is a Through-Focus-MTF graph schematically showing a fisheye lens according to the second embodiment of the invention at a low temperature of-40 degrees and under visible light of 100 lp/mm;

FIG. 12 is a Through-Focus-MTF graph schematically showing a fisheye lens according to a second embodiment of the invention at a high temperature of 85 degrees and under visible light of 100 lp/mm;

fig. 13 is a view schematically showing a configuration of a fisheye lens according to a third embodiment of the present invention;

fig. 14 is a MTF graph schematically showing 200lp/mm under visible light at a normal temperature of 20 degrees for a fisheye lens according to a third embodiment of the present invention;

fig. 15 is an MTF chart schematically showing 200lp/mm at a normal temperature of 20 degrees and at night in the infrared of the fisheye lens according to the third embodiment of the present invention;

fig. 16 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a third embodiment of the present invention at a normal temperature of 20 degrees and under visible light of 1001 p/mm;

fig. 17 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a third embodiment of the invention at a low temperature of-40 degrees and under visible light of 100 lp/mm;

fig. 18 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a third embodiment of the invention at a high temperature of 85 degrees and under visible light of 100 lp/mm;

fig. 19 is a view schematically showing a configuration of a fisheye lens according to a fourth embodiment of the present invention;

fig. 20 is an MTF chart schematically showing 200lp/mm under visible light at a normal temperature of 20 degrees for a fisheye lens according to a fourth embodiment of the present invention;

fig. 21 is an MTF chart schematically showing 200lp/mm at a normal temperature of 20 degrees and at night in the infrared of the fisheye lens according to the fourth embodiment of the present invention;

fig. 22 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a fourth embodiment of the present invention at a normal temperature of 20 degrees and under visible light of 1001 p/mm;

fig. 23 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a fourth embodiment of the invention at a low temperature of-40 degrees and under visible light of 100 lp/mm;

fig. 24 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a fourth embodiment of the invention at a high temperature of 85 degrees and under visible light of 100 lp/mm;

fig. 25 is a view schematically showing a structure of a fisheye lens according to a fifth embodiment of the present invention;

fig. 26 is an MTF chart schematically showing 200lp/mm under visible light at a normal temperature of 20 degrees in accordance with a fifth embodiment of the present invention;

fig. 27 is an MTF chart schematically showing 200lp/mm at a normal temperature of 20 degrees and at night in the infrared of the fisheye lens according to the fifth embodiment of the present invention;

fig. 28 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to fifth embodiment of the invention at a normal temperature of 20 degrees and under visible light of 1001 p/mm;

fig. 29 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to a fifth embodiment of the invention at a low temperature of-40 degrees and under visible light of 100 lp/mm;

fig. 30 is a Through-Focus-MTF diagram schematically showing a fisheye lens according to embodiment five of the present invention at a high temperature of 85 degrees and under visible light of 100 lp/mm.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

Fig. 1 is a view schematically showing a structure of a fisheye lens according to an embodiment of the present invention. As shown in fig. 1, the fish-eye lens of the present invention includes a lens group. The lens group includes: the zoom lens includes, in order from an object side to an image side along an optical axis, a first lens 1, a second lens 2, a third lens 3, a stop S, a fourth lens 4, a fifth lens 5, and a sixth lens 6. Wherein the first lens 1, the second lens 2 and the fifth lens 5 are negative power lenses; the third lens 3, the fourth lens 4, and the sixth lens 6 are positive power lenses. And the fourth lens 4 and the fifth lens 5 constitute a cemented lens group having negative power. The lens group is further provided with a seventh lens 7 close to the object side, and the seventh lens 7 is a negative power lens.

In the present invention, along the direction from the object side to the image side, the seventh lens element 7 is a meniscus lens element; the first lens 1 is a meniscus lens; the second lens 2 is a biconcave lens; the third lens 3 is a biconvex lens; the fourth lens 4 is a biconvex lens; the fifth lens 5 is a biconcave lens; the sixth lens 6 is a biconvex lens.

In the present invention, the seventh lens 7, the first lens 1 and the third lens 3 are spherical lenses; the second lens 2, the fourth lens 4, the fifth lens 5, and the sixth lens 6 are glass aspherical lenses or plastic aspherical lenses. And the aspheric surface satisfies the following formula:

in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a4, a6, A8, a10 and a12 respectively represent aspheric coefficients of fourth, sixth, eighth, tenth and twelfth orders.

Furthermore, the utility model discloses a half image height h of fisheye lens and effective focal length f of camera lens satisfy the relational expression: f/h is more than or equal to 0.5. The focal lengths of the first lens 1 and the second lens 2 are f1 and f2, respectively, and satisfy: 5 is more than or equal to f1/f2 is more than or equal to 1. The focal lengths of the fourth lens 4 and the fifth lens 5 are f4 and f5, respectively, and satisfy: -0.5. gtoreq.f 4/f 5. gtoreq.3. The focal lengths of the third lens 3 and the sixth lens 6 are f3 and f6, respectively, and satisfy: 2.5 is more than or equal to f3/f6 is more than or equal to 0.3. The lens back focal length d and the effective focal length f satisfy the relation: d/f is more than or equal to 1.4.

The abbe number vd4 of the fourth lens 4 and the abbe number vd5 of the fifth lens 5 satisfy the following relation: vd 4-Vd 5 is more than or equal to 30. The focal length f7 of the seventh lens 7 and the combined focal length Fn of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, and the sixth lens 6 satisfy: | f7| > | Fn |. The ratio of the R values of the object-side surface and the image-side surface of the seventh lens 7 satisfies: 1 < S1/S2 < 1.5.

Synthesize above-mentioned setting, the utility model discloses a camera lens can satisfy the object distance and clearly image at 0.1m to infinity object distance within range to realize satisfying the day night sharing simultaneously on the basis of F1.2 big light ring, expanded service environment's restriction when increasing the luminous flux. In addition the utility model discloses a full field of view scope of camera lens can reach 240 at utmost.

And the utility model discloses a reasonable control light path trend also guarantees that optical system's sensitivity is lower when realizing that design imaging performance is excellent, can satisfy the camera lens machining tolerance requirement.

The optimal configuration of each lens diopter and reasonable material choose for use, also make the utility model discloses the camera lens aberration obtains effectual correction, has overcome the lens material simultaneously because coefficient of expansion is big, causes the defect of focus drift easily under high low temperature environment, makes the utility model discloses the camera lens is at-40 ℃ -85 ℃ of temperature within range formation of image clearly.

By using the high-precision aspheric lens manufacturing mold, the tolerance of design can be achieved, the performance of an actual lens can be ensured, and the consistency of the quality of batch manufacturing can be ensured.

The following is a detailed description of five groups of embodiments according to the present invention, given in the above-described arrangement. Because according to the utility model discloses a fish-eye lens is total seven lenses, wherein, fourth lens 4 and fifth lens 5 constitute cemented lens, in addition diaphragm S and image plane are 15 faces altogether. For convenience of description, the respective surface numbers other than the image surface are designated as S1 to S14.

Five sets of embodiment data are as in table 1 below:

TABLE 1

The first implementation mode comprises the following steps:

fig. 1 is a schematic diagram illustrating a fisheye lens structure according to a first embodiment of the present invention.

In the first embodiment, the ratio f/h of the effective focal length f to the half-image height h is 0.8, and the aperture FNO is 1.3.

Table 2 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:

TABLE 2

In this embodiment, the aspheric data is shown in table 3 below, where K is the conic constant of the surface and A, B, C, D, E are the aspheric coefficients of fourth, sixth, eighth, tenth and twelfth orders, respectively:

number of noodles

K

A

B

C

D

E

S5

-80.478

-6.22E-02

8.94E-03

5.51E-04

-2.90E-04

2.44E-05

S6

-0.51

-1.21E-01

3.59E-02

-1.13E-02

2.53E-03

-4.42E-04

S10

-35.861

1.59E-01

-1.74E-01

6.43E-02

4.01E-02

-2.83E-02

S11

-2.757

-2.31E-01

2.21E-01

7.14E-02

-3.08E-01

1.42E-01

S12

-0.288

-1.72E-01

1.94E-01

-1.61E-01

6.72E-02

-1.10E-02

S13

-3.378

-2.89E-02

2.86E-02

-1.60E-02

3.32E-03

-3.96E-04

S14

--52.058

-7.04E-02

4.07E-02

-1.61E-02

2.69E-03

-1.82E-04

TABLE 3

Fig. 2 to 6 schematically show MTF graphs of 200lp/mm under visible light at a normal temperature of 20 degrees according to a first embodiment of the present invention; the first embodiment of the utility model is an infrared 200lp/mm MTF graph at normal temperature of 20 ℃ and night; the first embodiment of the utility model is a Through-Focus-MTF graph of 1001p/mm under visible light at normal temperature of 20 ℃; the first embodiment of the utility model is a 100lp/mm Through-Focus-MTF graph at low temperature of-40 ℃ under visible light; the first embodiment of the utility model is a Through-Focus-MTF graph of 100lp/mm at a high temperature of 85 ℃ under visible light.

As can be seen from fig. 2 to 6, the lens of the present embodiment can clearly image even in the temperature range of-40 ℃ to 85 ℃, and exhibits the infrared performance of the lens, and can satisfy day and night confocal.

The second embodiment:

fig. 7 is a schematic view showing a configuration of a fisheye lens according to a second embodiment of the present invention.

In the second embodiment, the ratio f/h of the effective focal length f to the half-image height h is 0.73, and the aperture FNO is 1.8.

Table 4 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:

number of noodles	Surface type	R value	Thickness of	Refractive index	Abbe number
						S1	Spherical surface	20.8	2	1.55	53
S2	Spherical surface	14.96	0.1
						S3	Spherical surface	14.45	2.43	1.79	23
S4	Spherical surface	2.17	2.18
						S5	Aspherical surface	10.5	1.15	1.55	53
S6	Aspherical surface	1.28	0.88
						S7	Spherical surface	3.61	2.28	1.9	22
S8	Spherical surface	-6.3	0.79
						S9	Stop	Infinity	0.06
S10	Aspherical surface	2.91	0.64	1.53	53
						S11	Aspherical surface	-2.67	0.53	1.64	23
S12	Aspherical surface	2.93	0.38
						S13	Aspherical surface	1.53	1.62	1.53	53
S14	Aspherical surface	-4.82	1.58
						Image plane	Spherical surface	Infinity

TABLE 4

In this embodiment, the aspheric data is shown in table 5 below, where K is the conic constant of the surface and A, B, C, D, E, F are the aspheric coefficients of fourth, sixth, eighth, tenth and twelfth orders, respectively:

number of noodles

K

A

B

C

D

E

S5

-238.976

-5.87E-02

9.36E-03

4.25E-04

-3.25E-04

3.09E-05

S6

-0.499

-1.14E-01

3.45E-02

-1.16E-02

2.50E-03

-4.39E-04

S10

-41.761

1.72E-01

-1.71E-01

6.02E-02

3.52E-02

-2.87E-02

S11

-9.985

-2.11E-01

1.81E-01

2.74E-02

-2.99E-01

2.14E-01

S12

-0.396

-1.7E-01

1.86E-01

-1.61E-01

7.00E-02

-1.01E-02

S13

-4.224

-2.70E-02

2.85E-02

-1.67E-02

3.41E-03

2.33E-04

S14

-47.701

-6.02E-02

4.04E-02

-1.61E-02

2.93E-03

1.02E-04

TABLE 5

Fig. 8 to 12 are MTF graphs schematically showing 200lp/mm of the fisheye lens according to the second embodiment of the present invention at a normal temperature of 20 degrees under visible light, respectively; the utility model discloses a 200lp/mm MTF graph of the fish-eye lens of the second embodiment at the normal temperature of 20 ℃ and at night; the utility model discloses a fish-eye lens of embodiment two is at the normal atmospheric temperature 20 degrees, under the visible light 1001 p/mm's Through-Focus-MTF picture; the fish-eye lens of the second embodiment of the utility model is a Through-Focus-MTF graph of 100lp/mm at low temperature of-40 ℃ under visible light; the utility model discloses a fish-eye camera lens of embodiment two is at high temperature 85 degrees, under the visible light 100 lp/mm's Through-Focus-MTF picture.

As can be seen from fig. 8 to 12, the lens of the present embodiment can clearly image even in the temperature range of-40 ℃ to 85 ℃, and exhibits the infrared performance of the lens, and can satisfy day and night confocal.

The third embodiment is as follows:

fig. 13 is a schematic view showing a fish-eye lens structure according to a third embodiment of the present invention.

In the third embodiment, the ratio f/h of the effective focal length f to the half-image height h is 0.61, and the aperture FNO is 1.6.

Table 6 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:

number of noodles	Surface type	R value	Thickness of	Refractive index	Abbe number
						S1	Spherical surface	16	0.7	1.64	24
S2	Spherical surface	13.6	0.5
						S3	Spherical surface	13.13	1.3	1.75	50
S4	Spherical surface		3	2.39
						S5	Aspherical surface	10000	1.96	1.54	56
S6	Aspherical surface	1.13	1.49
						S7	Spherical surface	3.62	1.69	1.75	50
S8	Spherical surface	-6.3	0.93
						S9	Stop	Infinity	0.02
S10	Aspherical surface	2.98	1	1.53	55
						S11	Aspherical surface	-1.92	0.51	1.65	22
S12	Aspherical surface	3.24	0.44
						S13	Aspherical surface	1.77	1.32	1.53	55
S14	Aspherical surface	-2.76	1.74
						Image plane	Spherical surface	Infinity

TABLE 6

In the present embodiment, the aspherical surface data is as shown in table 7 below, where K is a conic constant of the surface, and A, B, C, D, E, F are aspherical surface coefficients of fourth order, sixth order, eighth order, tenth order, and twelfth order, respectively:

TABLE 7

Fig. 14 to 18 are MTF graphs of 200lp/mm under visible light at a normal temperature of 20 degrees, respectively, schematically illustrating a fisheye lens according to a third embodiment of the present invention; the utility model discloses a 200lp/mm MTF graph of the fish-eye lens of the third embodiment at the normal temperature of 20 ℃ and at night; the fish-eye lens of the third embodiment of the utility model is a Through-Focus-MTF graph of 1001p/mm under visible light at normal temperature of 20 ℃; the fish-eye lens of the third embodiment of the utility model is a Through-Focus-MTF graph of 100lp/mm at low temperature of-40 ℃ under visible light; the utility model discloses a fish-eye camera lens of embodiment three is at high temperature 85 degrees, under the visible light 100 lp/mm's Through-Focus-MTF picture.

As can be seen from fig. 14 to 18, the lens of the present embodiment can clearly image even in the temperature range of-40 ℃ to 85 ℃, and exhibits the infrared performance of the lens, and can satisfy day and night confocal.

The fourth embodiment:

fig. 19 is a schematic view showing a configuration of a fisheye lens according to a fourth embodiment of the present invention.

In the fourth embodiment, the ratio f/h of the effective focal length f to the half-image height h is 0.53, and the aperture FNO is 2.0.

Table 8 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:

number of noodles	Surface type	R value	Thickness of	Refractive index	Abbe number
						S1	Spherical surface	13	1	1.64	24
S2	Spherical surface	11.7	0.5
						S3	Spherical surface	11.39	1.21	1.77	43
S4	Spherical surface	3.15	2.29
						S5	Aspherical surface	15	1.08	1.55	56
S6	Aspherical surface	0.98	0.88
						S7	Spherical surface	6.31	2.48	2	23
S8	Spherical surface	-6.62	0.12
						S9	Stop	Infinity	0.1
S10	Aspherical surface	2.51	1.09	1.55	56
						S11	Aspherical surface	-1.02	0.67	1.64	24
S12	Aspherical surface	4.05	0.13
						S13	Aspherical surface	2.29	1.4	1.54	55
S14	Aspherical surface	-1.79	1.8
						Image plane	Spherical surface	Infinity

TABLE 8

In this embodiment, the aspheric data is shown in table 9 below, where K is the conic constant of the surface and A, B, C, D, E, F are the aspheric coefficients of fourth, sixth, eighth, tenth and twelfth orders, respectively:

number of noodles

K

A

B

C

D

E

S5

-50.000

-8.76E-04

-3.09E-03

6.24E-04

-4.49E-05

7.94E-07

S6

-0.621

-1.34E-02

-2.23E-02

-1.27E-02

1.11E-02

-2.33E-03

S10

-6.193

6.60E-02

-4.98E-02

1.88E-01

-2.52E-01

9.25E-02

S11

-8.197

-3.95E-01

3.64E-01

5.14E-01

-2.53E+00

2.00E+00

S12

-5.185

-1.66E-02

8.95E-02

-9.21E-02

4.15E-02

-5.89E-03

S13

-15.895

2.53E-02

2.04E-03

-5.02E-03

4.13E-03

-7.93E-04

S14

-3.032

-4.22E-02

1.95E-02

-1.65E-03

-1.56E-03

1.00E-03

TABLE 9

Fig. 20 to 24 are MTF graphs of 200lp/mm under visible light at a normal temperature of 20 degrees by schematically showing a fisheye lens according to a fourth embodiment of the present invention; the fish-eye lens of the fourth embodiment of the utility model is an MTF graph of 200lp/mm at normal temperature of 20 ℃ and at night; the fish-eye lens of the fourth embodiment of the utility model is a Through-Focus-MTF graph of 1001p/mm under visible light at normal temperature of 20 ℃; the fish-eye lens of the fourth embodiment of the utility model is a Through-Focus-MTF graph of 100lp/mm at low temperature of-40 ℃ under visible light; the utility model discloses a fish-eye camera lens of embodiment four is at high temperature 85 degrees, under the visible light 100 lp/mm's Through-Focus-MTF picture.

As can be seen from fig. 20 to 24, the lens of the present embodiment can clearly image even in the temperature range of-40 ℃ to 85 ℃, and exhibits the infrared performance of the lens, and can satisfy day and night confocal.

The fifth embodiment:

fig. 25 is a diagram schematically showing a fisheye lens structure according to a fifth embodiment of the present invention.

In the fifth embodiment, the ratio f/h of the effective focal length f to the half-image height h is 0.57, and the aperture FNO is 2.0.

Table 10 below lists relevant parameters of each lens of the present embodiment, including surface type, radius of curvature, thickness, refractive index of material, abbe number:

watch 10

In this embodiment, the aspheric data is shown in table 11 below, where K is the conic constant of the surface and A, B, C, D, E, F are the aspheric coefficients of fourth, sixth, eighth, tenth and twelfth orders, respectively:

number of noodles

K

A

B

C

D

E

S5

0.000

-4.43E-03

-1.25E-03

3.15E-04

-2.77E-05

8.35E-07

S6

-0.669

-3.33E-02

-1.29E-02

-6.97E-03

5.66E-03

-1.45E-03

S10

-25.176

1.58E-01

-1.46E-01

8.32E-02

4.71E-02

-7.31E-02

S11

-1.627

-2.08E-01

3.20E-01

-1.16E-01

-4.22E-01

2.95E-01

S12

6.711

-9.53E-02

1.45E-01

-1.41E-01

7.34E-02

-2.44E-02

S13

-11.961

-1.71E-02

9.76E-03

-8.00E-03

6.10E-03

-2.24E-03

S14

-5.460

-7.53E-02

3.09E-02

-1.72E-02

6.56E-03

-1.22E-03

TABLE 11

Fig. 26 to 30 are MTF graphs of 200lp/mm under visible light at a normal temperature of 20 degrees, respectively, schematically illustrating a fisheye lens according to a fifth embodiment of the present invention; the fish-eye lens of the fifth embodiment of the utility model is an MTF graph of 200lp/mm at normal temperature of 20 ℃ and at night; the fish-eye lens of the fifth embodiment of the utility model is a Through-Focus-MTF graph of 1001p/mm under visible light at normal temperature of 20 ℃; the fish-eye lens of the fifth embodiment of the utility model is a Through-Focus-MTF graph of 100lp/mm at low temperature of-40 ℃ under visible light; the utility model discloses a fish-eye camera lens of embodiment five is at high temperature 85 degrees, under the visible light 100 lp/mm's Through-Focus-MTF picture.

As can be seen from fig. 26 to 30, the lens of the present embodiment can clearly image even in the temperature range of-40 ℃ to 85 ℃, and exhibits the infrared performance of the lens, and can satisfy day and night confocal.

According to the above embodiment of the utility model, the utility model discloses a camera lens can satisfy the object distance and clearly image at 0.1m to infinity object distance within range to realize satisfying the day night sharing on the basis of F1.2 big light ring simultaneously, expanded service environment's restriction when increasing the luminous flux. In addition the utility model discloses a full field of view scope of camera lens can reach 240 at utmost. And the utility model discloses a reasonable control light path trend also guarantees that optical system's sensitivity is lower when realizing that design imaging performance is excellent, can satisfy the camera lens machining tolerance requirement. The optimal configuration of each lens diopter and reasonable material choose for use, also make the utility model discloses the camera lens aberration obtains effectual correction, has overcome the lens material simultaneously because coefficient of expansion is big, causes the defect of focus drift easily under high low temperature environment, makes the utility model discloses the camera lens is at-40 ℃ -85 ℃ of temperature within range formation of image clearly. By using the high-precision aspheric lens manufacturing mold, the tolerance of design can be achieved, the performance of an actual lens can be ensured, and the consistency of the quality of batch manufacturing can be ensured.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (12)

1. A fisheye lens comprises a lens group;

the lens group includes: a first lens (1), a second lens (2), a third lens (3), a diaphragm (S), a fourth lens (4), a fifth lens (5), and a sixth lens (6) arranged in order from an object side to an image side along an optical axis;

the first lens (1), the second lens (2) and the fifth lens (5) are negative power lenses;

the third lens (3), the fourth lens (4) and the sixth lens (6) are positive power lenses; it is characterized in that the preparation method is characterized in that,

the first lens (1) is a meniscus lens;

the second lens (2) is a biconcave lens;

the third lens (3) is a biconvex lens;

the fourth lens (4) is a biconvex lens;

the fifth lens (5) is a biconcave lens;

the sixth lens (6) is a biconvex lens.

2. The fish-eye lens according to claim 1, characterized in that the fourth lens (4) and the fifth lens (5) constitute a cemented lens group with negative optical power.

3. The fisheye lens of claim 2, further comprising a seventh lens (7) disposed proximate to the object side of the lens group;

the seventh lens (7) is a meniscus lens and is a negative power lens.

4. The fish-eye lens according to claim 3, wherein the ratio of R values of the object-side face (S1) and the image-side face (S2) of the seventh lens (7) satisfies: 1 < S1/S2 < 1.5.

5. Fish-eye lens according to claim 4, characterized in that the seventh lens (7), the first lens (1) and the third lens (3) are spherical lenses;

the second lens (2), the fourth lens (4), the fifth lens (5) and the sixth lens (6) are glass aspheric lenses or plastic aspheric lenses.

6. The fisheye lens of claim 5 wherein the half-image height h of the lens and the effective focal length f of the lens satisfy the relationship: f/h is more than or equal to 0.5.

7. The fisheye lens of claim 6 wherein the lens back focal length d and the effective focal length f of the lens satisfy the relationship: d/f is more than or equal to 1.4.

8. Fish-eye lens according to claim 7, characterized in that the focal length f7 of the seventh lens (7) and the combined focal length Fn of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the sixth lens (6) satisfy: | f7| > | Fn |.

9. Fish-eye lens according to any of claims 1 to 8, wherein the focal lengths of the first lens (1) and the second lens (2) are f1 and f2, respectively, and satisfy: 5 is more than or equal to f1/f2 is more than or equal to 1.

10. Fish-eye lens according to one of the claims 1 to 8, characterized in that the fourth lens (4) and the fifth lens (5) have focal lengths f4 and f5, respectively, and satisfy: -0.5. gtoreq.f 4/f 5. gtoreq.3.

11. Fish-eye lens according to one of the claims 1 to 8, characterized in that the focal lengths of the third lens (3) and the sixth lens (6) are f3 and f6, respectively, and satisfy: 2.5 is more than or equal to f3/f6 is more than or equal to 0.3.

12. Fish-eye lens according to one of the claims 1 to 8, characterized in that the Abbe number vd4 of the fourth lens (4) and the Abbe number vd5 of the fifth lens (5) satisfy the following relation: vd 4-Vd 5 is more than or equal to 30.

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