CN218350614U

CN218350614U - Day and night type athermalized high-definition glass-plastic hybrid lens with large aperture of 6mm

Info

Publication number: CN218350614U
Application number: CN202222618845.XU
Authority: CN
Inventors: 周欧; 薛雷涛; 王锦平; 殷海明
Original assignee: Dongguan Changyi Photoelectric Co ltd
Current assignee: Dongguan Changyi Photoelectric Co ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-01-20
Anticipated expiration: 2032-09-29

Abstract

The utility model discloses a 6mm big light ring is type round clock does not have high clear glass of heat and is moulded hybrid lens, includes according to the preface by the thing side to picture side along the camera lens optical axis: a first lens which is an aspheric plastic lens with negative focal power; a second lens which is an aspheric plastic lens with positive focal power; a third lens which is an aspheric plastic lens with positive focal power; the fourth lens is a spherical glass lens with positive focal power; the fifth lens is a spherical glass lens; a sixth lens which is an aspherical plastic lens having a negative focal power; a seventh lens which is an aspherical plastic lens having a positive refractive power; and the eighth lens is an aspheric plastic lens with positive focal power. The lens adopts the combination of 2 spherical glasses and 6 non-spherical plastics, the aperture can be 1.2mm, the aperture is large, the image quality is high, the day and night confocality is good, and the clear picture can be kept in the temperature range of minus 40 ℃ to plus 80 ℃.

Description

Day and night type athermalization high-definition glass-plastic hybrid lens with large aperture of 6mm

Technical Field

The utility model relates to an optical lens field especially relates to a 6mm big light ring day and night type does not have high clear glass of heat and moulds hybrid lens.

Background

With the continuous improvement of safety consciousness of people, the monitoring lens is used as the 'eyes' of human beings, plays more and more important roles in the aspects of machine vision, artificial intelligence, criminal investigation monitoring, unmanned driving and the like, and promotes the development of the field of security monitoring. In recent years, many products have been introduced for monitoring lenses for different purposes of use or environments. However, the cost of the lens in the current market is high, the real shooting picture is not clear in a severe environment, the brightness of the target surface is not enough under a large angle, and the real shooting dark angle and the like are caused.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims at providing a 6mm big light ring day and night type does not have high clear glass of heat and moulds hybrid lens, this lens light ring is big, and the image quality is high, and the confocality is good day and night to can keep the picture clear at the temperature range of-40- +80 ℃.

The purpose of the utility model is realized through the following technical scheme:

a day and night type athermalized high-definition glass-plastic hybrid lens with a large aperture of 6mm defines the surface of one side of a lens, which is adjacent to an object plane, as an object side surface, and the surface of one side of the lens, which is adjacent to an image plane, as an image side surface, and is sequentially arranged from the object side to the image side along the optical axis of the lens:

the first lens is an aspheric plastic lens with negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;

the second lens is an aspheric plastic lens with positive focal power, and the image side surface of the second lens is a convex surface;

the third lens is an aspheric plastic lens with positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;

the fourth lens is a spherical glass lens with positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface;

the fifth lens is a spherical glass lens, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface;

the sixth lens is an aspheric plastic lens with negative focal power, and the object side surface of the sixth lens is a concave surface;

a seventh lens, which is an aspheric plastic lens with positive focal power, and the object side surface of which is a convex surface;

the eighth lens is an aspheric plastic lens with positive focal power, and the object side surface and the image side surface of the eighth lens are convex and concave;

the optical filter is arranged on the image side surface of the eighth lens;

the protective glass is integrated on the image sensor and is arranged on the image side surface of the optical filter;

an image pickup element disposed on an image side surface of the protective glass;

the lens further comprises an aperture stop, the aperture stop being located between the third lens and the fourth lens;

the fourth lens and the fifth lens are cemented lenses.

Further, the lens satisfies the following conditions:

1.74≤|f1/f|≤2.48，

2.23≤|f2/f|≤5.09，

2.57≤|f3/f|≤4.16，

2.20≤|f4/f|≤8.04，

-403.5≤f5/f≤513.7，

0.87≤|f6/f|≤1.34，

1.26≤|f7/f|≤1.94，

3.23≤|f8/f|≤16.43，

in the relation, f is the total focal length of the 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, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, and f8 is the focal length of the eighth lens.

Further, the focal length, the refractive index and the radius of curvature of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens respectively satisfy the following conditions:

f1

-14.87～-10.46

ND1

1.52～1.56

R11

+2.35～+2.96

R12

+1.56～+1.82

f2

+13.39～+30.61

ND2

1.60～1.68

R21

-135.33～+80.30

R22

-15.38～-9.55

f3

+15.43～+24.96

ND3

1.52～1.59

R31

-16.40～-3.71

R32

-6.33～-3.53

f4

+13.21～+48.32

ND4

1.70～1.79

R41

+6.62～+23.82

R42

+4.26～+5.67

f5

-2426.69～+3085

ND5

1.59～1.76

R51

+4.26～+5.67

R52

-15.25～-8.69

f6

-8.05～-5.20

ND6

1.60～1.68

R61

-15.57～-4.26

R62

-92.47～+26.29

f7

+7.59～+11.66

ND7

1.52～1.56

R71

+3.68～+13.53

R72

-8.09～+16.73

f8

+19.42～+98.76

ND8

1.60～1.68

R81

+3.31～+6.43

R82

+3.35～+7.26

wherein f1 is the focal length of the first lens, ND1 is the refractive index of the first lens, R11 is the radius of curvature of the object-side surface of the first lens, and R12 is the radius of curvature of the image-side surface of the first lens; f2 is the focal length of the second lens, ND2 is the refractive index of the second lens 2, R21 is the curvature radius of the object side surface of the second lens, and R22 is the curvature radius of the image side surface of the second lens; f is the focal length of the third lens, ND3 is the refractive index of the third lens, R31 is the curvature radius of the object side surface of the third lens, and R32 is the curvature radius of the image side surface of the third lens; f4 is the focal length of the fourth lens, ND4 is the refractive index of the fourth lens, R41 is the curvature radius of the object side surface of the fourth lens, and R42 is the curvature radius of the image side surface of the fourth lens; f5 is the focal length of the fifth lens, ND5 is the refractive index of the fifth lens, R51 is the curvature radius of the object side surface of the fifth lens, and R52 is the curvature radius of the image side surface of the fifth lens; f6 is the focal length of the sixth lens, ND6 is the refractive index of the sixth lens, R61 is the object-side curvature radius of the sixth lens, and R62 is the image-side curvature radius of the sixth lens; f7 is a focal length of the seventh lens, ND7 is a refractive index of the seventh lens, R71 is a curvature radius of an object side surface of the seventh lens, and R72 is a curvature radius of an image side surface of the seventh lens; f8 is the focal length of the eighth lens, ND8 is the refractive index of the eighth lens, R81 is the object-side curvature radius of the eighth lens, and R82 is the image-side curvature radius of the eighth lens; the "-" number indicates that the surface is curved to the side of the object plane.

Further, the day and night type athermal high-definition glass-plastic hybrid lens with the large aperture of 6mm meets the following relational expression:

IC/TTL≥0.29；

TTL/f≤3.75；

OBFL/TTL≥0.08；

in the relation, f is the total focal length of the lens; TTL is the total optical length of the lens; OBFL is the optical back intercept of the lens, IC is the full image height of the 1/2.7' chip collocated with the lens.

Furthermore, the diaphragm F # of the lens is less than or equal to 1.3, the total focal length F =6mm, and the total optical length TTL of the lens is less than or equal to 22.5mm.

Further, aspherical surfaces of the first lens, the second lens, the third lens, the sixth lens, the seventh lens, and the eighth lens satisfy the following formulas:

wherein Z is the rise of the lens along the optical axis, k is the coefficient of the curved surface cone, gamma is the semi-aperture of the lens in the direction perpendicular to the optical axis, C is the curvature of the lens, and A, B, C, D, E, F and G are coefficients of 4, 6, 8, 10, 12, 14 and 16 orders of the aspheric polynomial

Compared with the prior art, the beneficial effects of the utility model are that: this 6mm big light ring day and night type does not have high clear glass of heat moulds hybrid lens, adopt 2 spherical glass and 6 aspheric surface plastics mixed combination, optical lens's total focal length F =6mm, light ring F # satisfies that F # is less than or equal to 1.3, under big light ring big focal length, it is just bigger to lead to the light aperture, can guarantee that the contrast of system is high, the picture does not have the vignetting during shooting, system's aberration obtains fine correction simultaneously, optics performance is good, manufacturability is last, each lens is insensitive, lens face type is simple easy to be made, its processing cost is also low on the market relatively, have very high price/performance ratio, can realize small volume, light in weight, good performance and characteristics with low costs. And the utility model discloses through reasonable lens material selection, focal power distribution and optical design optimization, can arrange 5MP, 1/2.7's chip in pairs, realize 24 hours all-weather high definition control, the confocal of day night formation of image, it is clear to take a picture at high temperature +80 ℃ and low temperature-40 ℃ in fact.

Drawings

Fig. 1 is a schematic view of an optical structure of embodiment 1 of the present invention;

fig. 2 is a schematic diagram of an optical path structure according to embodiment 1 of the present invention;

FIG. 3 is a normal temperature +20 ℃ 125lp/mm defocus plot of 0.435-0.656 μm visible light in example 1 of the present invention;

FIG. 4 is a 125lp/mm defocus plot at low temperature of-40 ℃ with visible light of 0.435-0.656 μm for embodiment 1 of the present invention;

FIG. 5 is a 125lp/mm defocus plot of 0.435-0.656 μm visible light at high temperature +80 ℃ in the embodiment of the present invention;

FIG. 6 is a 125lp/mm defocus graph of 0.850 μm infrared light in accordance with embodiment 1 of the present invention;

FIG. 7 is a field curvature diagram of 0.546 μm in visible light according to example 1 of the present invention;

FIG. 8 is a distortion diagram of visible light of 0.546 μm according to embodiment 1 of the present invention;

fig. 9 is a relative illuminance chart of visible light of 0.546 μm in embodiment 1 of the present invention;

fig. 10 is a schematic view of an optical structure according to embodiment 2 of the present invention;

FIG. 11 is a normal temperature +20 ℃ 125lp/mm defocus plot of 0.435-0.656 μm visible light in example 2 of the present invention;

FIG. 12 is a 125lp/mm defocus plot at-40 ℃ with 0.435-0.656 μm visible light in example 2 of the present invention;

FIG. 13 is a high temperature +80 ℃ 125lp/mm defocus plot of 0.435-0.656 μm visible light in example 2 of the present invention;

fig. 14 is a 125lp/mm defocus graph of 0.850 μm infrared light of embodiment 2 of the present invention;

FIG. 15 is a field curvature of 0.546 μm in visible light in embodiment 2 of the present invention;

fig. 16 is a distortion diagram of visible light of 0.546 μm according to embodiment 2 of the present invention;

fig. 17 is a relative illuminance chart of visible light of 0.546 μm in embodiment 2 of the present invention;

fig. 18 is an optical structure diagram of embodiment 3 of the present invention;

FIG. 19 is a 125lp/mm defocus plot at room temperature +20 ℃ of 0.435-0.656 μm in visible light in embodiment 3 of the present invention;

FIG. 20 is a 125lp/mm defocus plot at low temperature of-40 ℃ with visible light of 0.435-0.656 μm for embodiment 3 of the present invention;

FIG. 21 is a 125lp/mm defocus plot of 0.435-0.656 μm visible light at high temperature +80 ℃ in the embodiment of the present invention;

FIG. 22 is a 125lp/mm defocus graph of 0.850 μm infrared light in accordance with embodiment 3 of the present invention;

fig. 23 is a field curvature diagram of 0.546 μm in visible light according to embodiment 3 of the present invention;

fig. 24 is a distortion diagram of visible light of 0.546 μm according to embodiment 3 of the present invention;

fig. 25 is a graph showing the relative illuminance of 0.546 μm in visible light according to embodiment 3 of the present invention.

Reference numerals: 1-a first lens; 2-a second lens; 3-a third lens; 4-a fourth lens; 5-a fifth lens; 6-sixth lens; 7-a seventh lens; 8-an eighth lens; 9-an optical filter; 10-protective glass; 11-an image capturing element; 12-aperture stop.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. In the present description, the expressions first, second, third and the like are used only for distinguishing one feature from another feature, and do not indicate any limitation on the features. The shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and not drawn to scale.

In the present invention, the paraxial region is a region near the optical axis. If the lens surface is convex and the convex position is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, the lens surface is concave at least in the paraxial region; when the lens surface is not limited to a convex surface, a concave surface or a flat surface, it means that the lens surface may be a convex surface, a concave surface or a flat surface. The surface of each lens closest to the object is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

For a better understanding and practice, the invention is described in detail below with reference to the accompanying drawings.

The utility model provides a big light ring of 6mm type athermalization high clear glass moulds hybrid lens round clock, the surface of the neighbouring object plane one side of lens is the object side, and the surface of the neighbouring image plane one side of lens is the image side, contains according to the preface by the thing side to the image side along the camera lens optical axis:

the first lens 1, the first lens 1 is a plastic lens of aspheric surface with negative focal power, the object side of the first lens 1 is a convex surface, the image side is a concave surface;

the second lens 2, the second lens 2 is an aspheric plastic lens with positive focal power, the image side of the second lens 2 is a convex surface;

the third lens 3, the third lens 3 is a plastic lens of aspheric surface with positive focal power, the object side of the third lens 3 is a concave surface, the image side is a convex surface;

the fourth lens 4, the fourth lens 4 is a spherical glass lens with positive focal power, the object side of the fourth lens 4 is a convex surface, and the image side is a concave surface;

the fifth lens 5, the fifth lens 5 is a spherical glass lens, the object side surface of the fifth lens 5 is a convex surface, and the image side surface is a convex surface;

a sixth lens 6, wherein the sixth lens 6 is an aspheric plastic lens with negative focal power, and the object side surface of the sixth lens 6 is a concave surface;

a seventh lens 7, wherein the seventh lens 7 is an aspheric plastic lens with positive focal power, and the object-side surface of the seventh lens 7 is a convex surface;

the eighth lens 8, the eighth lens 8 is a plastic lens of aspheric surface with positive focal power, the object side of the eighth lens 8 is a convex surface, the image side is a concave surface;

the optical filter 9, the optical filter 9 is set up in the image side of the eighth lens 8, the optical filter 9 is made of H-K9L;

a protective glass 10, the protective glass 10 being integrated on the image sensor, the protective glass 10 being disposed on an image side surface of the optical filter 9;

an image pickup element 11, the image pickup element 11 being disposed on the image side surface of the protective glass 10;

the lens further comprises an aperture diaphragm 12, and the aperture diaphragm 12 is positioned between the third lens 3 and the fourth lens 4;

among them, the fourth lens 4 and the fifth lens 5 are cemented lenses.

The utility model discloses in, for letting optical system present better performance, we will rationally select the focal length of lens material, each lens of rational distribution and rationally optimize optical system in the design process to the aberration of correction system finally lets the performance optimization of optical system's performance. The utility model discloses in, the focus of first lens 1 is f1, and the focus of second lens 2 is f2, and the focus of third lens 3 is f3, and the focus of fourth lens 4 is f4, and the focus of fifth lens 5 is f5, and the focus of sixth lens 6 is f6, and the focus of seventh lens 7 is f7, and the focus of eighth lens 8 is f8, and the total focus of camera lens is f, and the ratio of the total focus of each lens and system satisfies the following condition:

1.74≤|f1/f|≤2.48；

2.23≤|f2/f|≤5.09；

2.57≤|f3/f|≤4.16；

2.20≤|f4/f|≤8.04；

-403.5≤f5/f≤513.7；

0.87≤|f6/f|≤1.34；

1.26≤|f7/f|≤1.94；

3.23≤|f8/f|≤16.43；

the utility model discloses in, consider optical system's aberration and the balanced temperature problem of floating, the focus of each lens, material and lens R value satisfy following condition respectively:

f1

-14.87～-10.46

ND1

1.52～1.56

R11

+2.35～+2.96

R12

+1.56～+1.82

f2

+13.39～+30.61

ND2

1.60～1.68

R21

-135.33～+80.30

R22

-15.38～-9.55

f3

+15.43～+24.96

ND3

1.52～1.59

R31

-16.40～-3.71

R32

-6.33～-3.53

f4

+13.21～+48.32

ND4

1.70～1.79

R41

+6.62～+23.82

R42

+4.26～+5.67

f5

-2426.69～+3085

ND5

1.59～1.76

R51

+4.26～+5.67

R52

-15.25～-8.69

f6

-8.05～-5.20

ND6

1.60～1.68

R61

-15.57～-4.26

R62

-92.47～+26.29

f7

+7.59～+11.66

ND7

1.52～1.56

R71

+3.68～+13.53

R72

-8.09～+16.73

f8

+19.42～+98.76

ND8

1.60～1.68

R81

+3.31～+6.43

R82

+3.35～+7.26

wherein f1 is a focal length of the first lens 1, ND1 is a refractive index of the first lens 1, R11 is a curvature radius of an object side surface of the first lens 1, and R12 is a curvature radius of an image side surface of the first lens 1; f2 is the focal length of the second lens 2, ND2 is the refractive index of the second lens 2, R21 is the radius of curvature of the object-side surface of the second lens 2, and R22 is the radius of curvature of the image-side surface of the second lens 2; f is the focal length of the third lens 3, ND3 is the refractive index of the third lens 3, R31 is the radius of curvature of the object-side surface of the third lens 3, and R32 is the radius of curvature of the image-side surface of the third lens 3; f4 is the focal length of the fourth lens element 4, ND4 is the refractive index of the fourth lens element 4, R41 is the radius of curvature of the object-side surface of the fourth lens element 4, and R42 is the radius of curvature of the image-side surface of the fourth lens element 4; f5 is the focal length of the fifth lens 5, ND5 is the refractive index of the fifth lens 5, R51 is the object-side curvature radius of the fifth lens 5, and R52 is the image-side curvature radius of the fifth lens 5; f6 is the focal length of the sixth lens 6, ND6 is the refractive index of the sixth lens 6, R61 is the radius of curvature of the object-side surface of the sixth lens 6, and R62 is the radius of curvature of the image-side surface of the sixth lens 7; f7 is a focal length of the seventh lens 7, ND7 is a refractive index of the seventh lens 7, R71 is a radius of curvature of an object side surface of the seventh lens 7, and R72 is a radius of curvature of an image side surface of the seventh lens 7; f8 is the focal length of the eighth lens 8, ND8 is the refractive index of the eighth lens 8, R81 is the radius of curvature of the object-side surface of the eighth lens 8, and R82 is the radius of curvature of the image-side surface of the eighth lens 8; the "-" number indicates that the surface is curved to the side of the object plane.

In the utility model, f is the total focal length of the lens; TTL is the optical total length of the lens; the OBFL is an optical rear intercept of the lens, and the optical rear intercept of the lens is the distance from a point, closest to the image surface, of the image side surface of the eighth lens 8 to the image surface; the IC is the full image height of a 1/2.7' chip matched with the lens; they satisfy the following relationship:

IC/TTL≥0.29；

TTL/f≤3.75；

OBFL/TTL≥0.08。

the utility model discloses in, the light ring of camera lens is F #, satisfies F # =1.2, and the total focus of camera lens is F, and F satisfies F =6mm, and the optics total length of camera lens is TTL, and TTL satisfies TTL and is less than or equal to 22.5mm.

The following is according to the utility model discloses an above-mentioned setting gives the embodiment and specifically explains according to the utility model discloses a 6mm big light ring day and night type does not have high clear glass of heat and moulds hybrid lens.

The data for the specific embodiments are summarized in table 1 below:

TABLE 1

Conditional formula (II)	Example 1	Example 2	Example 3
				1.74≤\|f1/f\|≤2.48	2.20	2.4	2.48
2.23≤\|f2/f\|≤5.09	2.83	3.33	2.84
				2.57≤\|f3/f\|≤4.16	4.14	3.75	4.16
2.20≤\|f4/f\|≤8.04	2.56	2.20	4.08
				-403.5≤f5/f≤513.7	21.03	-55.2	5.85
0.87≤\|f6/f\|≤1.34	0.87	0.93	0.93
				1.26≤\|f7/f\|≤1.94	1.33	1.54	1.33
3.23≤\|f8/f\|≤16.43	5.62	4.96	5.63
				IC/TTL≥0.29	0.30	0.30	0.29
TTL/f≤3.75	3.74	3.74	3.75
				OBFL/TTL≥0.08	0.20	0.11	0.14

Following according to the utility model discloses an above-mentioned setting is given concrete implementation and is specifically explained according to the utility model discloses a 4mm big light ring does not have full glass lens of heat high definition. The main element notation is shown in table 2:

TABLE 2

Example 1

Referring to fig. 1 and fig. 2, an optical structure diagram and an optical path structure diagram are shown, respectively. In the present embodiment, the first lens 1, the second lens 2, the third lens 3, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are plastic aspherical lenses, and the fourth lens 4 and the fifth lens 5 are glass spherical lenses. The field angle DFOV =67.5 ° of the chip with the lens matched 1/2.7, the aperture F # =1.2 of the lens, the total focal length F =6mm of the lens, and the total optical length TTL =22.46mm of the lens.

In this embodiment, the first lens adopts a lens with a meniscus negative power whose convex surface faces the object, which is used for fast converging light, and the abbe numbers of the first lens 1, the third lens 3, the fifth lens 5 and the seventh lens 7 are greater than 55.7, and the abbe numbers of the second lens 2, the fourth lens 4, the sixth lens 6 and the eighth lens 8 are less than 24, so that the chromatic aberration of the system can be reduced, and the problems of aberration, balance temperature drift, day and night confocal property and the like of the optical system can be considered.

Table 3 shows the radius of curvature (unit: mm) of each lens, the center thickness d (unit: mm) of each lens, the refractive index (ND) and Abbe constant (VD) of each lens, and the aspheric k value (Concic) of each lens.

TABLE 3

In table 3, the radius of curvature represents the degree of curvature of the lens surface, positive values represent the surface being curved to the image plane side, and negative values represent the surface being curved to the object plane side, where "Infnity" represents that the surface is a plane; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the deflection capability of the current lens material to light rays, and the Abbe number represents the dispersion characteristic of the current lens material to the light rays; the k value represents the numerical magnitude of the best fitting conic coefficient for the aspheric surface.

In the present embodiment, the aspherical surfaces of the first lens 1, the second lens 2, the third lens 3, the sixth lens 6, the seventh lens 7, and the eighth lens 8 can be defined by the following equation of even-order aspherical surface:

wherein Z is the rise of the lens along the optical axis direction, k is the coefficient of the curved cone, gamma is the half aperture of the lens perpendicular to the optical axis direction, C is the curvature of the lens, and A, B, C, D, E, F and G are the coefficients of the 4 th order, 6 th order, 8 th order, 10 th order, 12 th order, 14 th order and 16 th order of the aspheric surface polynomial.

Table 4 lists the coefficients for the aspheric surfaces of the various optical surfaces:

TABLE 4

Noodle sequence number

A

B

C

D

E

F

G

S1

-9.25E-03

-1.44E-03

2.99E-04

-2.48E-05

1.10E-06

-2.44E-08

1.73E-10

S2

-1.42E-02

-2.79E-03

6.54E-04

-7.27E-05

4.06E-06

-6.46E-08

-3.02E-09

S3

1.06E-03

-1.47E-04

-6.20E-05

1.72E-05

-3.00E-06

2.91E-07

-1.18E-08

S4

-7.38E-03

2.20E-03

-5.65E-04

8.72E-05

-8.27E-06

4.43E-07

-1.03E-08

S5

2.81E-03

2.88E-04

-1.97E-04

3.87E-05

-4.22E-06

2.53E-07

-6.46E-09

S6

1.85E-03

-4.52E-05

-1.20E-05

1.76E-06

-1.25E-07

4.60E-09

-6.55E-11

S11

9.45E-03

-2.19E-03

3.24E-04

-3.53E-05

2.53E-06

-1.01E-07

1.70E-09

S12

5.32E-04

1.59E-03

-6.16E-04

9.06E-05

-6.98E-06

2.81E-07

-4.69E-09

S13

-1.84E-02

6.75E-03

-1.59E-03

2.27E-04

-1.86E-05

8.05E-07

-1.46E-08

S14

-1.06E-02

3.05E-03

-6.27E-04

9.29E-05

-7.47E-06

2.89E-07

-4.33E-09

S15

-5.14E-03

-8.92E-05

2.31E-05

5.73E-06

-1.58E-06

1.15E-07

-3.20E-09

S16

-8.15E-03

5.32E-04

-1.03E-04

2.26E-05

-3.15E-06

1.92E-07

-4.33E-09

In the present embodiment, referring to fig. 3-5, the defocus of the lens at high temperature +80 ℃ and low temperature-40 ℃ is less than 3 μm, so that the small defocus ensures that the lens can shoot high definition pictures at high temperature +80 ℃ and low temperature-40 ℃.

Referring to fig. 6, a 0.850 μm infrared defocus curve of the lens in this embodiment is shown, and the 0.850 μm infrared defocus of the lens is smaller than 5 μm defocus, so that the captured image is clear during night-time shooting, and day and night confocal can be achieved.

Referring to FIG. 7, a field curvature of 0.546 μm of visible light of the lens in the present embodiment is shown. Referring to FIG. 8, an F Theta distortion diagram of 0.546 μm of visible light of the lens in this embodiment is shown, wherein the horizontal axis represents F Theta distortion (unit:%) and the vertical axis represents half field angle (unit:%). As can be seen from the figure, the F Theta distortion of the lens is smaller and less than 17%, the lens distortion is smaller, the distortion of a real shot picture and the real situation can be guaranteed not to be distorted, and the distortion of the lens is well corrected.

Referring to fig. 9, it is shown a relative illumination chart of 0.546 μm of visible light of the lens in this embodiment, the relative illumination of the lens at the maximum viewing field is greater than 54%, the light incoming amount is sufficient, and it is ensured that the real shot image has no dark angle even if the lens is used in a dark environment.

Example 2

Fig. 10 is an optical structure diagram of this embodiment 2. In embodiment 2, the field angle DFOV =67 ° of the chip with the lens matched 1/2.7, the aperture F # =1.2 ° of the lens, the total focal length F =6mm, the total optical length TTL =22.47mm of the lens, and the maximum image height can be made to be 6.91mm.

Table 5 shows the radius of curvature (unit: mm) of each lens, the center thickness d (unit: mm) of each lens, the refractive index (ND) and Abbe constant (VD) of each lens, and the aspherical k value (Concic) of each lens in example 2.

TABLE 5

Number of noodles	Radius of curvature R	Center thickness d	Refractive index ND	Abbe constant VD	K
						S1	2.48	0.70	1.53	55.7	-1.11
S2	1.69	2.21			-0.80
						S3	-67.24	2.80	1.63	23.9	-94.39
S4	-10.96	1.27			-76.71
						S5	-6.72	3.20	1.53	55.7	-1.20E-05
S6	-5.04	0.07			-0.86
						S7	Infinity	0.07
S8	6.62	0.77	1.78	25.7
						S9	4.26	3.64	1.59	68.3
S10	-15.20	0.16
						S11	-5.64	0.75	1.63	23.9	-13.38
S12	10.37	0.50			2.38
						S13	3.94	1.24	1.53	55.7	-3.02E-04
S14	16.73	0.51			-33.69
						S15	3.83	1.41	1.66	20.3
S16	4.05	1.00
						S17	Infinity	0.21	1.51	64.2
S18	Infinity	1.58
						S19	Infinity	0.40	1.51	64.2

Table 6 shows the coefficients of the aspherical surfaces of the optical surfaces in example 2.

TABLE 6

Number of noodles

A

B

C

D

E

F

G

S1

-6.06E-03

-1.44E-03

2.52E-04

-1.81E-05

7.08E-07

-1.43E-08

1.16E-10

S2

-1.18E-02

-3.08E-03

6.70E-04

-8.34E-05

6.98E-06

-3.75E-07

9.62E-09

S3

4.06E-04

-3.54E-04

4.30E-05

-1.11E-05

1.44E-06

-8.75E-08

2.14E-09

S4

-6.32E-03

1.37E-03

-3.04E-04

4.14E-05

-3.38E-06

1.53E-07

-2.90E-09

S5

1.33E-03

1.59E-06

-5.79E-05

1.20E-05

-1.22E-06

6.54E-08

-1.43E-09

S6

8.24E-04

-2.38E-05

-7.70E-06

1.39E-06

-1.25E-07

5.69E-09

-1.03E-10

S11

5.35E-03

-9.64E-04

1.52E-04

-1.82E-05

1.34E-06

-5.39E-08

8.88E-10

S12

-8.15E-05

-4.03E-04

9.01E-05

-1.49E-05

1.29E-06

-5.72E-08

1.01E-09

S13

-6.90E-03

9.75E-04

-1.84E-04

2.02E-05

-2.04E-06

1.21E-07

-2.93E-09

S14

4.02E-03

1.82E-04

3.17E-05

-2.78E-05

3.87E-06

-2.26E-07

4.99E-09

S15

-9.52E-03

5.71E-04

2.47E-06

-1.64E-05

2.26E-06

-1.21E-07

1.97E-09

S16

-1.00E-02

3.73E-04

1.03E-04

-3.76E-05

4.88E-06

-2.98E-07

6.85E-09

In the present embodiment, referring to fig. 11-13, the defocus of the lens at high temperature +80 ℃ and low temperature-40 ℃ is less than 5.5 μm, so that the small defocus ensures that the lens can shoot high definition pictures at high temperature +80 ℃ and low temperature-40 ℃.

Referring to fig. 14, the infrared 0.850 μm defocus amount of the lens in the present embodiment is shown to be less than 6 μm, which ensures that the photographed image is clear during night photographing.

Referring to fig. 15, a field curvature diagram of the visible light of 0.546 μm of the lens in the present embodiment is shown. Referring to fig. 16, it is shown an F Theta distortion diagram of the lens of the present embodiment with visible light of 0.546 μm, where the F-Tan (Theta) distortion of the lens is less than 16.7%, the lens distortion is small, and it can be ensured that the real shot image and the real situation are not distorted.

Referring to fig. 17, a relative illumination chart of 0.546 μm of visible light of the lens in this embodiment is shown, where the relative illumination of the lens at the maximum viewing field is greater than 62%, and the light incoming amount is sufficient, so that even if the lens is used in a dark environment, there is no dark angle in a real shot image.

Example 3

Fig. 18 is an optical structure diagram of the present embodiment 5. In embodiment 3, the field angle DFOV =67.5 ° of the chip with the lens matched to 1/2.7, the aperture F # =1.2 ° of the lens, the total focal length F =6mm of the lens, the total optical length TTL =22.48mm of the lens, and the maximum image height can be made to be 6.91mm.

Table 15 shows the radius of curvature (unit: mm) of each lens, the center thickness d (unit: mm) of each lens, the refractive index (ND) and Abbe constant (VD) of each lens, and the aspherical k value (Concic) of each lens in example 3.

Watch 15

Number of noodles	Radius of curvature R	Center thickness d	Refractive index ND	Abbe constant VD	K
						S1	2.49	0.68	1.53	55.7	-1.11
S2	1.72	1.76			-0.82
						S3	-129.16	3.37	1.63	23.9	-94.39
S4	-10.20	1.15			-76.71
						S5	-5.19	2.45	1.53	55.7	-1.27E-05
S6	-4.36	0.27			-0.86
						S7	Infinity	-0.14
S8	10.61	0.68	1.78	25.7
						S9	5.67	3.39	1.59	68.3
S10	-10.09	0.25
						S11	-7.85	0.70	1.64	23.5	-13.38
S12	6.96	0.17			2.38
						S13	8.73	1.76	1.53	55.7	-3.02E-04
S14	-7.87	0.06			-33.69
						S15	4.22	2.11	1.66	20.3	2.60E-04
S16	4.15	1.85			-0.03
						S17	Infinity	0.21	1.51	64.2
S18	Infinity	1.38
						S19	Infinity	0.4	1.51	64.2

Table 16 gives the coefficients of the aspherical surfaces of the respective optical surfaces in example 3.

TABLE 16

Referring to fig. 19-21, the defocusing amount of the lens at high temperature of +80 ℃ and low temperature of-40 ℃ is less than 3.0 μm, so that the small defocusing amount ensures that the lens can shoot high-definition pictures at high temperature of +80 ℃ and low temperature of-40 ℃. The lens is proved to be resistant to severe environment.

Referring to fig. 22, it is shown that the defocus amount of the lens in this embodiment is smaller than 5.5 μm in the infrared range of 0.850 μm, so as to ensure that the captured image is clear during night-time shooting, and achieve day-night confocal.

Please refer to fig. 23, which shows a field curvature diagram of 0.546 μm of visible light of the lens in this embodiment. Referring to FIG. 24, an F Theta distortion diagram of 0.546 μm of visible light of the lens in this embodiment is shown, wherein the horizontal axis represents F Theta distortion (unit:%) and the vertical axis represents half field angle (unit:%). As can be seen from the figure, the F Theta distortion of the lens is smaller and less than 17%, the lens distortion is smaller, the real shot picture and the real situation are not distorted, and the distortion of the lens is well corrected.

Please refer to fig. 25, which is a diagram of relative illumination of 0.546 μm of visible light of the lens in this embodiment, wherein the relative illumination of the lens at the maximum viewing field is greater than 55%, and the light incoming amount is sufficient, so that the lens can be used in a dark environment without dark corners in real-shot images.

In conclusion, this day and night type of big light ring of 6mm does not have high clear glass and moulds hybrid lens, adopts 2 spherical glass and 6 aspheric surface plastics to mix the combination, under reaching the equal quality in industry, its each lens is insensitive, and the lens face type is simple easy to be made, and its processing cost is also low relatively on the market, has very high price/performance ratio, can realize super large light ring, light in weight, characteristics that performance is good and with low costs, moreover the utility model discloses the aberration of optical system, balanced temperature drift and confocal scheduling problem of day and night have been considered comprehensively, through reasonable lens material selection, focal power distribution and optical design optimization, can match 5MP, 1/2.7 inch's chip, realize 24 hours all-weather high definition control, the confocal picture of day and night, at high temperature +80 ℃ and low temperature-40 ℃ real time is clear.

The foregoing description only describes several embodiments of the present invention, and the description is specific and detailed, but the scope of the present invention should not be limited thereby. It should be noted that, to those skilled in the art, changes and modifications may be made without departing from the spirit of the invention, and it is intended that the invention also encompass such changes and modifications.

Claims

1. The utility model provides a big light ring of 6mm day and night type athermalization high clear glass moulds hybrid lens which characterized in that: the lens is arranged from an object side to an image side along an optical axis of the lens in order:

the third lens is an aspheric plastic lens with positive focal power, the object-side surface of the third lens is a concave surface, and the image-side surface of the third lens is a convex surface;

the eighth lens is an aspheric plastic lens with positive focal power, and the object-side surface of the eighth lens is a convex surface while the image-side surface of the eighth lens is a concave surface;

the fourth lens and the fifth lens are cemented lenses.

2. The day and night type athermal high-definition glass-plastic hybrid lens with 6mm large aperture as claimed in claim 1, wherein: focal length value ranges sequentially corresponding to the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are respectively; -14.87 to-10.46, +13.39 to +30.61, +15.43 to +24.96, +13.21 to +48.32, -2426.69 to +3085, -8.05 to-5.20, +7.59 to +11.66 and +19.42 to +98.76;

the values of the corresponding refractive indexes are 1.52-1.56, 1.60-1.68, 1.52-1.59, 1.70-1.79, 1.59-1.76, 1.60-1.68, 1.52-1.56 and 1.60-1.68 respectively;

the values of the object side curvature radii which correspond to each other in sequence are respectively + 2.35- +2.96, -135.33- +80.30, -16.40- + 3.71, + 6.62- +23.82, + 4.26- +5.67, -15.57- +4.26, + 3.68- +13.53 and + 3.31- +6.43;

the values of the curvature radiuses of the image side surfaces which correspond to each other in sequence are respectively + 1.56- +1.82, -15.38- + 9.55, -6.33- + 3.53, + 4.26- +5.67, -15.25- + 8.69, -92.47- +26.29, -8.09- +16.73 and + 3.35- +7.26;

wherein the "-" number indicates that the surface is curved to the object plane side.

3. The day and night type athermal high-definition glass-plastic hybrid lens with 6mm large aperture as claimed in claim 1, wherein: the lens satisfies the following relational expression:

IC/TTL≥0.29，

TTL/f≤3.75，

OBFL/TTL≥0.08；

in the relation, f is the total focal length of the lens, TTL is the total optical length of the lens, OBFL is the optical back-focal length of the lens, and IC is the full image height of the 1/2.7' chip collocated with the lens.

4. The day and night type athermal high-definition glass-plastic hybrid lens with 6mm large aperture as claimed in claim 1, wherein: the aperture F # of the lens is less than or equal to 1.3, the total focal length F =6mm, and the total optical length TTL of the lens is less than or equal to 22.5mm.

5. The day and night type athermal high-definition glass-plastic hybrid lens with 6mm large aperture as claimed in claim 1, wherein: the aspheric surfaces of the first lens, the second lens, the third lens, the sixth lens, the seventh lens and the eighth lens satisfy the following formulas:

wherein: z is the rise of the lens along the optical axis direction, k is a curved surface cone coefficient, gamma is the semi-aperture of the lens vertical to the optical axis direction, C is the curvature of the lens, and A, B, C, D, E, F and G are coefficients of 4, 6, 8, 10, 12, 14 and 16 orders of aspheric surface polynomial.

6. The day and night type athermal high-definition glass-plastic hybrid lens with 6mm large aperture as claimed in claim 1, wherein: the lens further comprises an optical filter, and the optical filter is arranged on the image side face of the eighth lens.

7. The day and night type athermal high-definition glass-plastic hybrid lens with 6mm large aperture as claimed in claim 6, wherein: the lens further comprises protective glass, the protective glass is integrated on the image sensor, and the protective glass is arranged on the image side face of the optical filter.

8. The day-night type athermalized high-definition glass-plastic hybrid lens with a large aperture of 6mm as claimed in claim 7, wherein: the camera lens still includes image acquisition element, image acquisition element sets up the image side face of cover glass.

9. The day-night type athermalized high-definition glass-plastic hybrid lens with a large aperture of 6mm as claimed in claim 1, wherein: the lens barrel further includes an aperture stop located between the third lens and the fourth lens.