CN105137573B - A kind of day and night wide-angle focuses overall plastic monitoring camera - Google Patents

Abstract

Overall plastic monitoring camera is focused the invention discloses a kind of day and night wide-angle, including the first lens, the second lens, the 3rd lens and the 4th lens, 4 lens use the non-spherical lens of plastic cement material, reduction uses lens numbers, effectively reduction camera lens weight and manufacturing cost, improve product competitiveness；And by distributing the positive negative focal length of each lens rationally, camera lens aberration is set effectively to be corrected, camera lens is overcome simultaneously, and the problem of focus drifting and bad high/low temperature parsing is produced because of environment temperature, add use occasion and the range of environmental conditions of camera lens so that camera lens of the present invention meets the function that day and night and wide-angle are focused.

Description

A kind of day and night wide-angle focuses overall plastic monitoring camera

【Technical field】

The present invention relates to optical lens, especially a kind of day and night wide-angle focuses overall plastic monitoring camera.

【Background technology】

Current monitoring camera wide variety, wherein M12 hickeys camera lens commercially occupies very big share, prior art In, in the day and night wide angle monitoring lens with M12 hickeys, typically more using the lens of 6 or more than 6, such as patent Document CN 104459947 (A) discloses a kind of monitoring camera using 6 lens combinations；Although patent document CN 201984201U, CN102778746 (A) and CN 104090351 (A) disclose the monitoring camera using 4 sheet glass lens, but Consider glass lens processing cost and nitre material price now, and the 5 of plastic lens price is at least per the price of sheet glass lens More than times, so using excessive glass lens, its manufacturing cost is high, causes and is in a disadvantageous position in price competition, while also can Cause the overall weight of camera lens larger, be unfavorable for the development of camera lens product lightness.

The present invention is researched and proposed in view of the shortcomings of the prior art.

【The content of the invention】

Overall plastic monitoring camera, including 4 are focused the technical problem to be solved in the present invention is to provide a kind of day and night wide-angle Using the non-spherical lens of plastic cement material, reduction uses lens numbers, effectively reduction camera lens weight and manufacturing cost, improves production Product competitiveness；And by distributing the positive negative focal length of each lens rationally, camera lens aberration is effectively corrected, overcome simultaneously Camera lens produces the problem of focus drifting and bad high/low temperature parsing because of environment temperature, adds use occasion and the environment of camera lens Condition and range so that camera lens of the present invention meets the function that day and night and wide-angle are focused.

In order to solve the above technical problems, a kind of day and night wide-angle of the invention focuses overall plastic monitoring camera, from object plane to picture Face is disposed with the first lens, the second lens, the 3rd lens, the 4th lens, optical filter and sensitive film.

First lens, the second lens, the 3rd lens and the 4th lens are plastic aspheric lenes.

First lens are negative focal length meniscus lens.

Second lens and the 4th lens are positive focal length.

3rd lens are negative focal length biconcave lens.

First lens, the 3rd focal length of lens are respectively that f1, f3 are met：

3.3<f1/f3<3.92。

The lens 4 of second lens 2 and the 4th are biconvex lens, and second lens 2 and the focal length of the 4th lens 4 are respectively F2, f4, lens optical back focal length are BFL, and lens optical overall length is TTL, is met：

-0.7<f2/f1<- 0.6,1.72<f2/f4<1.77,0.22<BFL/TTL<0.24.

Present invention additionally comprises a protection eyeglass, the protection eyeglass is located at camera lens front end.

The protection eyeglass is plate glass.

First lens, the second lens, the curvature corresponding to the aspheric radius surface of the 3rd lens and the 4th lens are c, Distance on lens surface a little to optical axis is r, and the quadratic surface constant of lens surface is K, first lens, second saturating Mirror, the quadravalence of the 3rd lens and the 4th lens, six ranks, eight ranks, ten ranks, ten second orders, ten quadravalences and the asphericity coefficient of 16 ranks Along the rise of optical axis direction it is some z in respectively A, B, C, D, E, F, G, aspherical lens surface, meets：

The clear aperture of camera lens of the present invention is F#, and visual field is FOV, is met：

F#=2.5mm, FOV=83 °.

Compared with prior art, the invention has the advantages that：

1st, the first lens, the second lens, the 3rd lens and the 4th lens use plastic aspheric lenes, reduce number of lenses Amount, is minimized camera lens cost, improves product competitiveness.

2nd, camera lens of the present invention, by distributing the positive negative focal length of each lens rationally, obtains camera lens aberration using 4 lens Effectively correct, overcome camera lens and the problem of focus drifting and bad high/low temperature parsing is produced because of environment temperature, add mirror The use occasion of head and range of environmental conditions.

3rd, the protection eyeglass using plate glass is provided with camera lens front end of the present invention, effectively prevent the first lens and scraped Wound.

4th, camera lens clear aperture F#=2.5mm of the present invention, FOV=83 ° of visual field so that camera lens of the present invention meets day and night And the function that wide-angle is focused.

【Brief description of the drawings】

The embodiment to the present invention is described in further detail below in conjunction with the accompanying drawings, wherein：

Fig. 1 is each lens distribution schematic diagram in camera lens of the present invention.

Fig. 2 is the analysis diagram of the first embodiment of the invention.

Fig. 3 is the hot spot figure of the first embodiment of the invention.

Fig. 4 is MTF curve figure of the first embodiment of the invention under -20 DEG C of cryogenic conditions.

Fig. 5 is MTF curve figure of the first embodiment of the invention under 60 DEG C of hot conditions.

Fig. 6 is the analysis diagram of second of embodiment of the invention.

Fig. 7 is the hot spot figure of second of embodiment of the invention.

Fig. 8 is MTF curve figure of second of the embodiment of the invention under -20 DEG C of cryogenic conditions.

Fig. 9 is MTF curve figure of second of the embodiment of the invention under 60 DEG C of hot conditions.

Figure 10 is the analysis diagram of the third embodiment of the invention.

Figure 11 is the hot spot figure of the third embodiment of the invention.

Figure 12 is MTF curve figure of the third embodiment of the invention under -20 DEG C of cryogenic conditions.

Figure 13 is MTF curve figure of the third embodiment of the invention under 60 DEG C of hot conditions.

【Embodiment】

Embodiments of the present invention are elaborated below in conjunction with the accompanying drawings.

As shown in figure 1, a kind of day and night wide-angle of the invention focuses overall plastic monitoring camera, set gradually from object plane to image planes There are protection eyeglass 7, the first lens 1, the second lens 2, the 3rd lens 3, the 4th lens 4, optical filter 5 and sensitive film 6, the protection Eyeglass 7 is located at camera lens front end, and the protection eyeglass 7 is plate glass, is scraped off effectively prevent the first lens 1 and influences mirror The image quality that head is shot.

First lens 1, the second lens 2, the 3rd lens 3 and the 4th lens 4 are plastic aspheric lenes, are reduced saturating Mirror quantity, is minimized camera lens cost, improves product competitiveness.

By distributing rationally, first lens 1 are negative focal length meniscus lens, the lens 4 of the second lens 2 and the 4th For positive focal length biconvex lens, the 3rd lens 3 are negative focal length biconcave lens.

First lens 1, the second lens 2, the 3rd lens 3 and the focal length of the 4th lens 4 are respectively f1, f2, f3 and f4, mirror Head optic back focal is away from for BFL, and lens optical overall length is TTL, is met：

-0.7<f2/f1<- 0.6,3.3<f1/f3<3.92,1.72<f2/f4<1.77,0.22<BFL/TTL<0.24.

By distributing the positive negative focal length of each lens rationally, camera lens aberration is effectively corrected, overcome camera lens because Environment temperature and produce focus drifting and high/low temperature parsing it is bad the problem of, add use occasion and the environmental condition model of camera lens Enclose.

First lens 1, the second lens 2, the curvature corresponding to the aspheric radius surface of the 3rd lens 3 and the 4th lens 4 For c, distance on lens surface a little to optical axis is r, and the quadratic surface constant of lens surface is K, first lens 1, the Quadravalence, six ranks, eight ranks, ten ranks, ten second orders, ten quadravalences and the aspheric of 16 ranks of two lens 2, the 3rd lens 3 and the 4th lens 4 Face coefficient be respectively in A, B, C, D, E, F, G, aspherical lens surface a little along optical axis direction rise be z, meet：

The clear aperture of camera lens of the present invention is F#, and visual field is FOV, is met：F#=2.5mm, FOV=83 ° so that the present invention Camera lens meets the function that day and night and wide-angle are focused.

It is the parameter of 3 embodiments of camera lens of the present invention below, wherein f is the focal length of camera lens of the present invention；From object plane to picture Face, S1 is first surface of protection eyeglass 7, and S2 is second surface of protection eyeglass 7, and S3 is first of the first lens 1 Surface, S4 is second surface of the first lens 1, and S5 is first surface of the second lens 2, and S6 is the second of the second lens 2 Individual surface, S7 is diaphragm face, and S8 is first surface of the 3rd lens 3, and S9 is second surface of the 3rd lens 3, and S10 is the First surface of four lens 4, S11 is second surface of the 4th lens 4, and S12 is first surface of optical filter 5, and S13 is Second surface of optical filter 5.

Embodiment one

As shown in Figures 2 to 5, f=2.7mm, F#=2.5, FOV=95 °, BFL=5.8, TTL in the first embodiment =24.4, the focal length of each lens is as follows：

f1	f2	f3	f4	f2/f1	f1/f3	f2/f4	BFL/TTL
								-6.53	4.17	-1.78	2.36	-0.639	3.6685	1.76695	0.2377

The R values of each lens surface, thickness and its material are as follows in the first embodiment：

	R values	Thickness	Material
				S1	infinity	1	1.52,64.2
S2	infinity	1
				S3	9.5516	1.8	1.54,56
S4	2.427	8.5558
				S5	6.4459	4	1.63,23.9
S6	-3.47	0.1
				S7	infinity	0.3279
S8	-2.6133	0.534	1.64,22.4
				S9	2.245	0.1
S10	2.5102	1.178	1.54,55.8
				S11	-2.1462	1
S12	infinity	0.8	1.52,64.2
				S13	infinity	4.0034

Each Lens Surface Parameters is as follows in the first embodiment：

K

A

B

C

D

E

S3

0

-3.88E-03

1.18E-04

-1.09E-06

-2.41E-08

4.56E-10

S4

-0.846

-7.30E-03

-3.64E-05

2.34E-05

-7.85E-07

S5

-0.2168

-2.87E-03

-3.41E-05

1.51E-04

-2.20E-05

S6

-0.4062

1.15E-02

7.05E-04

-3.30E-03

1.28E-03

S8

0.5535

1.62E-02

1.70E-03

-1.23E-02

6.31E-03

S9

0.0605

-0.0388

4.80E-03

-1.03E-02

4.78E-03

S10

1.8677

-5.17E-02

1.36E-03

-6.75E-03

6.48E-04

S11

-0.01

8.05E-03

-1.53E-03

1.77E-03

-6.51E-04

Embodiment two

As shown in Figures 6 to 9, f=2.45mm, F#=2.4 in second of embodiment, FOV=83 °, BFL=5.72, TTL=24.78, the focal length of each lens is as shown in the table：

f1	f2	f3	f4	f2/f1	f1/f3	f2/f4	BFL/TTL
								-5.95	4.131	-1.8	2.3899	-0.694	3.3077	1.72865	0.23

The thickness of each lens, material and its surface R values are as shown in the table in second of embodiment：

	R values	Thickness	Material
				S1	infinity	1	1.52,64.2
S2	infinity	1
				S3	15.9926	1.8	1.54,56
S4	2.5979	9.023
				S5	6.268	4	1.63,23.9
S6	-3.448	0.1
				S7	infinity	0.3279
S8	-2.635	0.534	1.64,22.4
				S9	2.265	0.1
S10	2.5078	1.178	1.54,55.8
				S11	-2.2	1
S12	infinity	0.8	1.52,64.2
				S13	infinity	3.92

Each Lens Surface Parameters is as follows in second of embodiment：

K

A

B

C

D

E

S3

0

-3.85E-03

1.20E-04

-1.07E-06

-2.47E-08

4.56E-10

S4

-0.846

-7.50E-03

-4.84E-05

2.32E-05

-7.83E-07

S5

-0.2168

-2.87E-03

-3.41E-05

1.51E-04

-2.20E-05

S6

-0.4062

1.15E-02

7.05E-04

-3.30E-03

1.28E-03

S8

0.5535

1.55E-02

1.63E-03

-1.18E-02

6.62E-03

S9

0.0605

-0.392

4.58E-03

-1.00E-02

5.12E-03

S10

1.8677

-5.17E-02

1.36E-03

-6.75E-03

6.48E-04

S11

-0.01

8.05E-03

-1.53E-03

1.77E-03

-6.51E-04

Embodiment three

As shown in Figure 10 to Figure 13, in the third embodiment, f=2.67, F#=2.46FOV=90 °, BFL=5.7, TTL=24.96, the focal length of each lens is as shown in the table：

f1	f2	f3	f4	f2/f1	f1/f3	f2/f4	BFL/TTL
								-6.88	4.16	-1.764	2.36	-0.605	3.9002	1.76271	0.2284

The thickness of each lens, material and its surface R values are as shown in the table in the third embodiment：

	R values	Thickness	Material
				S1	infinity	1	1.52,64.2
S2	infinity	1
				S3	12.4335	1.8	1.54,56
S4	2.7415	9.227
				S5	6.2626	4	1.63,23.9
S6	-3.4964	0.1
				S7	infinity	0.3279
S8	-2.5955	0.534	1.64,22.4
				S9	2.2155	0.1
S10	2.5102	1.178	1.54,55.8
				S11	-2.1462	1
S12	infinity	0.8	1.52,64.2
				S13	infinity	3.9

Each Lens Surface Parameters is as follows in the third embodiment：

K

A

B

C

D

E

S3

0

-3.88E-03

1.20E-04

-1.06E-06

-2.48E-08

4.22E-10

S4

-0.846

-7.09E-03

-1.90E-05

2.24E-05

-8.14E-07

S5

-0.2168

-2.87E-03

-3.41E-05

1.51E-04

-2.20E-05

S6

-0.4062

1.15E-02

7.05E-04

-3.30E-03

1.28E-03

S8

0.5535

1.58E-02

1.56E-03

-1.10E-02

5.85E-03

S9

0.0605

-0.0481

7.28E-03

-1.19E-02

5.30E-03

S10

1.8677

-5.17E-02

1.36E-03

-6.75E-03

6.48E-04

S11

-0.01

8.05E-03

-1.53E-03

1.77E-03

-6.51E-04

Claims (5)

1. a kind of day and night wide-angle focuses overall plastic monitoring camera, it is characterised in that first is disposed with from object plane to image planes saturating Mirror (1), the second lens (2), the 3rd lens (3), the 4th lens (4), optical filter (5) and sensitive film (6)；

First lens (1), the second lens (2), the 3rd lens (3) and the 4th lens (4) are plastic aspheric lenes；

First lens (1) are negative focal length meniscus lens；

Second lens (2) and the 4th lens (4) are positive focal length；

3rd lens (3) are negative focal length biconcave lens；

First lens (1), the 3rd lens (3) focal length are respectively f1, f3, satisfaction：

3.3<f1/f3<3.92；

Second lens (2) and the 4th lens (4) are biconvex lens, and second lens (2) and the 4th lens (4) focal length are respectively F2, f4, lens optical back focal length are BFL, and lens optical overall length is TTL, is met：

-0.7<f2/f1<- 0.6,1.72<f2/f4<1.77,0.22<BFL/TTL<0.24.

2. a kind of day and night wide-angle focuses overall plastic monitoring camera according to claim 1, it is characterised in that also protected including one Protecting lens (7), the protection eyeglass (7) is located at camera lens front end.

3. a kind of day and night wide-angle focuses overall plastic monitoring camera according to claim 2, it is characterised in that the protective glass Piece (7) is plate glass.

4. a kind of day and night wide-angle according to claim 1 or claim 2 focuses overall plastic monitoring camera, it is characterised in that described first Lens (1), the second lens (2), the curvature corresponding to the aspheric radius surface of the 3rd lens (3) and the 4th lens (4) are c, lens Distance on surface a little to optical axis is r, and the quadratic surface constant of lens surface is K, first lens (1), the second lens (2), quadravalence, six ranks, eight ranks, ten ranks, ten second orders, ten quadravalences and the aspheric of 16 ranks of the 3rd lens (3) and the 4th lens (4) Face coefficient be respectively in A, B, C, D, E, F, G, aspherical lens surface a little along optical axis direction rise be z, meet：

$z=\frac{{\mathrm{cr}}^2}{1+\sqrt{1-\left(1+k\right)c^2{r}^2}}+{\mathrm{Ar}}^4+{\mathrm{Br}}^6+{\mathrm{Cr}}^8+{\mathrm{Dr}}^{10}+{\mathrm{Er}}^{12}+{\mathrm{Fr}}^{14}+{\mathrm{Gr}}^{16}.$

5. a kind of day and night wide-angle according to claim 1 or claim 2 focuses overall plastic monitoring camera, it is characterised in that clear aperture For F#, visual field is FOV, is met：

F#≤2.5mm, FOV >=83 °.