CN105137573A - Day-night dual-purpose wide-angle focus-fixing all-plastic monitoring lens - Google Patents

Abstract

The invention discloses a day-night dual-purpose wide-angle focus-fixing all-plastic monitoring lens. The day-night dual-purpose wide-angle focus-fixing all-plastic monitoring lens comprises a first lens, a second lens, a third lens and a fourth lens. The four lenses are respectively an aspherical lens made of a plastic material, the number of the lenses is reduced, the weight and the manufacturing cost of the lens are effectively lowered, and the product competitiveness is enhanced; positive and negative focuses of all the lenses are optimally configured, and the lens aberration is effectively corrected; in addition, the problems of focus drifting and poor high-low temperature analysis caused by the environment temperature are solved for the lens, the use occasions of the lens are increased, the environment condition range is widened, and the lens provided by the invention has day-night dual-purpose and wide-angle focus fixing functions.

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 hickey camera lens commercially occupies very great share, in prior art, with in the day and night wide angle monitoring lens of M12 hickey, the general lens using more than 6 or 6, as patent documentation CN104459947 (A) discloses the monitoring camera of a kind of employing 6 lens combinations more; Although patent documentation CN201984201U, CN102778746 (A) and CN104090351 (A) discloses the monitoring camera of employing 4 sheet glass lens, but consider glass lens processing cost and nitre material price now, and the price of every sheet glass lens is at least more than 5 times of plastic lens price, so use too much glass lens, its manufacturing cost is high, cause and be in a disadvantageous position in price competition, also the overall weight of camera lens can be caused simultaneously comparatively large, be unfavorable for that camera lens product lightness develops.

Namely the present invention researchs and proposes for the deficiencies in the prior art.

[summary of the invention]

The technical problem to be solved in the present invention is to provide a kind of day and night wide-angle and focuses overall plastic monitoring camera, comprises the non-spherical lens that 4 adopt plastic cement material, reduces and use lens numbers, effectively reduce 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 corrected effectively, overcome camera lens simultaneously and produce focus drifting because of environment temperature and high/low temperature resolves bad problem, add use occasion and the range of environmental conditions of camera lens, the function making camera lens of the present invention meet day and night and wide-angle to focus.

For solving the problems of the technologies described above, a kind of day and night wide-angle of the present invention focuses overall plastic monitoring camera, is disposed with the first lens, the second lens, the 3rd lens, the 4th lens, optical filter and sensitive film from object plane to image planes.

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

Described first lens are negative focal length meniscus lens.

Described second lens and the 4th lens are positive focal length.

Described 3rd lens are negative focal length biconcave lens.

Described first lens, the 3rd focal length of lens are respectively f1, f3 and meet:

3.3<f1/f3<3.92。

Described second lens 2 and the 4th lens 4 are biconvex lens, described second lens 2 He

4th lens 4 focal length is respectively f2, f4, and lens optical back focal length is BFL, camera lens

Optics overall length is TTL, meets:

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

The present invention also comprises a protective lens, and described protective lens is located at camera lens front end.

Described protective lens is sheet glass.

The curvature corresponding to aspheric surface radius of described first lens, the second lens, the 3rd lens and the 4th lens is c, distance a bit to optical axis on lens surface is r, the quadric surface constant of lens surface is K, the asphericity coefficient on the quadravalence of described first lens, the second lens, the 3rd lens and the 4th lens, six rank, eight rank, ten rank, ten second orders, ten quadravalences and 16 rank is respectively A, B, C, D, E, F, G, rise a bit along optical axis direction in aspherical lens surface is z, meets:

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

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

F#＝2.5mm，FOV＝83°。

Compared with prior art, tool of the present invention has the following advantages:

1, the first lens, the second lens, the 3rd lens and the 4th lens all adopt plastic aspheric lenes, reduce lens numbers, camera lens cost are minimized, improve product competitiveness.

2, camera lens of the present invention adopts 4 lens, by distributing the positive negative focal length of each lens rationally, camera lens aberration is corrected effectively, overcomes camera lens and produce focus drifting because of environment temperature and high/low temperature resolves bad problem, add use occasion and the range of environmental conditions of camera lens.

3, be provided with the protective lens adopting sheet glass in camera lens front end of the present invention, effectively prevent the first lens and be scraped off.

4, camera lens clear aperture F#=2.5mm, visual field FOV=83 ° of the present invention, the function making camera lens of the present invention meet day and night and wide-angle to focus.

[accompanying drawing explanation]

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail, 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 present invention.

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

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

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

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

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

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

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

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

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

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

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

[embodiment]

Below in conjunction with accompanying drawing, embodiments of the present invention are elaborated.

As shown in Figure 1; a kind of day and night wide-angle of the present invention focuses overall plastic monitoring camera; protective lens 7, first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, optical filter 5 and sensitive film 6 is disposed with from object plane to image planes; described protective lens 7 is located at camera lens front end; described protective lens 7 is sheet glass, is scraped off effectively prevent the first lens 1 and affects the image quality of lens shooting.

Described first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4 are plastic aspheric lenes, reduce lens numbers, camera lens cost are minimized, improve product competitiveness.

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

Described first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4 focal length are respectively f1, f2, f3 and f4, and lens optical back focal length is BFL, and lens optical overall length is TTL, meet:

f1-0.7<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 being corrected effectively, overcoming camera lens and producing focus drifting because of environment temperature and high/low temperature resolves bad problem, adding use occasion and the range of environmental conditions of camera lens.

The curvature corresponding to aspheric surface radius of described first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4 is c, distance a bit to optical axis on lens surface is r, the quadric surface constant of lens surface is K, the asphericity coefficient on the quadravalence of described first lens 1, second lens 2, the 3rd lens 3 and the 4th lens 4, six rank, eight rank, ten rank, ten second orders, ten quadravalences and 16 rank is respectively A, B, C, D, E, F, G, rise a bit along optical axis direction in aspherical lens surface is z, meets:

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

The clear aperture of camera lens of the present invention is F#, and visual field is FOV, meets: F#=2.5mm, FOV=83 °, the function making camera lens of the present invention meet day and night and wide-angle to focus.

Be below the parameter of 3 embodiments of camera lens of the present invention, wherein f is the focal length of camera lens of the present invention, from object plane to image planes, S1 is first surface of protective lens 7, S2 is second surface of protective lens 7, S3 is first surface of the first lens 1, S4 is second surface of the first lens 1, S5 is first surface of the second lens 2, S6 is second surface of the second lens 2, S7 is diaphragm face, S8 is first surface of the 3rd lens 3, S9 is second surface of the 3rd lens 3, S10 is first surface of the 4th lens 4, S11 is second surface of the 4th lens 4, S12 is first surface of optical filter 5, 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 ° in the first embodiment, BFL=5.8, TTL=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

In the first embodiment, the R value of each lens surface, thickness and material thereof are as follows:

	R value	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

In the first embodiment, each Lens Surface Parameters is as follows:

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, FOV=83 ° in the second embodiment, 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

In the second embodiment, the thickness of each lens, material and surperficial R value thereof are as shown in the table:

	R value	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

In the second embodiment, each Lens Surface Parameters is as follows:

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

In the third embodiment, the thickness of each lens, material and surperficial R value thereof are as shown in the table:

	R value	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

In the third embodiment, each Lens Surface Parameters is as follows:

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 (6)

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

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

Described first lens (1) are negative focal length meniscus lens;

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

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

Described first lens (1), the 3rd lens (3) focal length are respectively f1, f3, meet:

3.3<f1/f3<3.92。

2. a kind of day and night wide-angle focuses overall plastic monitoring camera according to claim 1, it is characterized in that described second lens (2) and the 4th lens (4) are biconvex lens, described second lens (2) and the 4th lens (4) focal length are respectively f2, f4, lens optical back focal length is BFL, lens optical overall length is TTL, meets:

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

3. a kind of day and night wide-angle focuses overall plastic monitoring camera according to claim 1, characterized by further comprising a protective lens (7), and described protective lens (7) is located at camera lens front end.

4. a kind of day and night wide-angle focuses overall plastic monitoring camera according to claim 2, it is characterized in that described protective lens (7) is sheet glass.

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

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

6. according to claim 1 or 2 or 3, a kind of day and night wide-angle focuses overall plastic monitoring camera, and it is characterized in that clear aperture is F#, visual field is FOV, meets:

F#≤2.5mm，FOV≥83°。