CN205176364U - Dual -purpose control tight shot of day night - Google Patents

Abstract

The utility model discloses a dual -purpose control tight shot of day night adopts five lens altogether, has reduced use lens quantity, and three lens aspherical lens for adopting the plastic material wherein, effectively reduces camera lens weight and manufacturing cost, has improved the product competitiveness, and the positive negative focal length through each lens of optimal configuration, make the camera lens aberration proofreaied and correct effectively, overcome the aspherical lens of plastic material simultaneously, because its coefficient of expansion is big, lead to the fact the defect that the focus drifted about easily under high and low temperature environment, it should the configuration to adopt for this product camera lens focus drift control within range in closing, and have analytic good characteristics under high low temperature condition, consequently increased the use occasion and the ambient condition scope of camera lens, promote the quality and the competitiveness of camera lens product.

Description

A kind of day and night monitoring tight shot

[technical field]

The utility model relates to optical lens, especially a kind of day and night monitoring tight shot.

[background technology]

Day and night fixed focus monitoring camera lens, generally all uses glass mirror, as patent documentation CN203311083U and CN203311082 discloses the camera lens all using glass mirror, because each eyeglass is glass material, causes this camera lens cost relatively high.

Along with the development of science and technology, then can produce more accurate by mould and the plastic lens of glass mirror can be substituted, because plastic lens price is relatively low, in order to improve the price competitiveness of camera lens, reduce production cost, a lot of optical lens employs plastic lens, with alternative glass mirror; But its thermal expansivity of plastic lens is comparatively large, makes camera lens there is the defect of focus drifting, causes the unstable properties of camera lens.

Namely the utility model is researched and proposed for the deficiencies in the prior art.

[utility model content]

The technical problems to be solved in the utility model is to provide a kind of day and night monitoring tight shot, adopt five lens altogether, decrease use lens numbers, and wherein three lens are the non-spherical lens adopting plastic cement material, effective reduction camera lens weight and manufacturing cost, improve product competitiveness; And by distributing the positive and negative refraction rate of each lens rationally, camera lens aberration being corrected effectively, overcomes the non-spherical lens of plastic cement material simultaneously, because its expansion coefficient is large, under high and low temperature environment, easily cause the defect of focus drifting; Adopting this configuration, this product camera lens focus drifting amount is controlled in the reasonable scope, and there is the excellent feature of parsing under high/low temperature condition, because this increasing use occasion and the range of environmental conditions of camera lens, promoting quality and the competitive power of camera lens product.

For solving the problems of the technologies described above, a kind of day and night monitoring tight shot, first lens with negative index are comprised successively from object plane to image planes, there are the second lens of positive refracting power, there are the 3rd lens of positive refracting power, there are negative index the 4th lens, there is the 5th lens, filter plate and sensitive film of positive refracting power.

The focal length of described first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens is respectively f1, f2, f3, f4 and f5, meets:

-3＜f2/f1＜-2.6，-1.1＜f4/f5＜-0.7，-0.83＜f1/f3＜-0.55。

Described first lens are curved month type glass spherical lens.

Described second lens are curved month type plastic aspheric lenes.

Described 3rd lens are biconvex glass spherical lens.

Described 4th lens are double concave type plastic aspheric lenes.

Described 5th lens are biconvex plastic aspheric lenes.

Described first lens are hither plane towards the surface of object plane, and are concave surface towards the surface of image planes; Described second lens are concave surface towards the surface of object plane, and are convex surface towards the surface of image planes.

The Abbe number of a slice lens is had at least to meet in described first lens, the second lens, the 3rd lens, the 4th lens and the 5th lens: vd > 80.

Compared with prior art, a kind of day and night monitoring of the utility model tight shot, tool has the following advantages:

1, the utility model is day and night monitoring camera, parsing can reach more than three mega pixels, adopt five lens altogether, decrease lens numbers, and wherein the second lens, the 4th lens and the 5th lens three lens adopt plastic aspheric lenes, camera lens cost is minimized, improves product competitiveness.

2, by distributing the positive and negative refraction rate 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.

3, employ the low dispersing lens that at least a slice Abbe number vd is greater than 80 in five lens, ensure the aberration balancing between near infrared light and blue light, improve lens imaging quality.

[accompanying drawing explanation]

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail, wherein:

Fig. 1 is each lens distribution schematic diagram in the utility model camera lens.

Fig. 2 is the visible ray analysis diagram of the first embodiment of the utility model.

Fig. 3 is the near infrared light analysis diagram of the first embodiment of the utility model.

Fig. 4 is the chromaticity difference diagram of the first embodiment of the utility model.

Fig. 5 is the curvature of field distortion figure of the first embodiment of the utility model.

Fig. 6 is the MTF curve map of the first embodiment of the utility model under the cryogenic conditions of-20 DEG C.

Fig. 7 is the MTF curve map of the first embodiment of the utility model under the hot conditions of 60 DEG C.

Fig. 8 is the visible ray analysis diagram of the utility model the second embodiment.

Fig. 9 is the near infrared light analysis diagram of the utility model the second embodiment.

Figure 10 is the chromaticity difference diagram of the utility model the second embodiment.

Figure 11 is the curvature of field distortion figure of the utility model the second embodiment.

Figure 12 is the MTF curve map of the utility model the second embodiment under the cryogenic conditions of-20 DEG C.

Figure 13 is the MTF curve map of the utility model the second embodiment under the hot conditions of 60 DEG C.

Figure 14 is the visible ray analysis diagram of the third embodiment of the utility model.

Figure 15 is the near infrared light analysis diagram of the third embodiment of the utility model.

Figure 16 is the chromaticity difference diagram of the third embodiment of the utility model.

Figure 17 is the curvature of field distortion figure of the third embodiment of the utility model.

Figure 18 is the MTF curve map of the third embodiment of the utility model under the cryogenic conditions of-20 DEG C.

Figure 19 is the MTF curve map of the third embodiment of the utility model under the hot conditions of 60 DEG C.

[embodiment]

Below in conjunction with accompanying drawing, embodiment of the present utility model is elaborated.

As shown in Figure 1, a kind of day and night monitoring of the utility model tight shot, is provided with the first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4, the 5th lens 5, optical filter 6 and sensitive film 7 successively from object plane to image planes.Adopt five lens altogether, decrease lens numbers, and the second lens 2, the 4th lens 4 and the 5th lens 5 are plastic aspheric lenes, camera lens cost is minimized, improves product competitiveness.

Through distributing rationally, described first lens 1 are positive refracting power curved month type glass spherical lens, described second lens 2 are positive refracting power curved month type non-spherical lens, described 3rd lens 3 are positive refracting power biconvex glass spherical lens, described 4th lens 4 are positive refracting power double concave type non-spherical lens, and described 5th lens 5 are positive refracting power biconvex non-spherical lens.

The focal length of described first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4 and the 5th lens 5 is respectively f1, f2, f3, f4 and f5, meets:

-3＜f2/f1＜-2.6，-1.1＜f4/f5＜-0.7，-0.83＜f1/f3＜-0.55。

By distributing the positive and negative refraction rate of each lens rationally, camera lens aberration is corrected effectively, overcome the defect easily causing focus drifting because adopting its temperature expansion coefficient of plastic lens comparatively large under causing high and low temperature environment, as shown in Fig. 6, Fig. 7, Figure 12, Figure 13, Figure 18 and Figure 19, adopt this configuration, this product camera lens focus drifting is controlled in the reasonable scope, and there is the excellent feature of parsing under high/low temperature condition, because this increasing use occasion and the range of environmental conditions of camera lens, promote quality and the competitive power of camera lens product.

Described first lens 1 are hither plane towards the surface of object plane, and are concave surface towards the surface of image planes; Described second lens 2 are concave surface towards the surface of object plane, and are convex surface towards the surface of image planes.

In order to ensure the aberration balancing between near infrared light and blue light, improve lens imaging quality, the Abbe number of described first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4 and the 5th lens 5 is vd, has at least the Abbe number of a slice lens to meet: vd > 80 in described first lens 1, second lens 2, the 3rd lens 3, the 4th lens 4 and the 5th lens 5.

The curvature corresponding to aspheric surface radius of described second lens 2, the 4th lens 4 and the 5th lens 5 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 second lens 2, the 4th lens 4 and the 5th lens 5, 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:

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

Be below the parameter of 3 embodiments of the utility model camera lens, the clear aperture of camera lens is F#, and the focal length of to be FOV, f be in visual field camera lens, as shown in Figure 1, S1-S13 is each surface.

Embodiment one

As shown in Figures 2 to 7, f=3.9mm, F#=2.0, FOV=110 ° in the first embodiment, the focal length of each lens is as follows:

f1	f2	f3	f4	f5	f2/f1	f4/f5	f1/f3
								-5.68	16.2	7.78	-5.09	5.97	-2.852	-0.8526	-0.7301

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

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

K

A

B

C

D

E

F

S4

-52.9681

-9.68E-03

1.66E-03

-2.59E-04

-2.17E-06

-2.16E-06

2.52E-07

S5

-7.72

-6.82E-03

7.40E-04

-3.73E-05

-4.07E-06

1.00E-06

-4.86E-08

S8

-8.78

-3.16E-03

1.91E-04

-3.57E-05

-4.18E-06

1.53E-06

-1.01E-07

S9

0.8026

-1.92E-03

-3.42E-04

-1.20E-05

-1.78E-06

4.16E-07

-5.25E-08

S10

1.4419

7.52E-04

-5.24E-04

5.04E-05

-7.49E-07

-1.62E-07

1.46E-08

S11

-31.4

-0.01

2.26E-03

-3.08E-04

2.28E-05

7.62E-07

-7.90E-08

Embodiment two

As shown in Fig. 8 to Figure 13, f=3.7mm, F#=2.0, FOV=110 ° in the second embodiment, the focal length of each lens is as shown in the table:

f1	f2	f3	f4	f5	f2/f1	f4/f5	f1/f3
								-5.68	17.01	9.77	-5.09	4.69	-2.995	-1.0853	-0.5814

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

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

K

A

B

C

D

E

F

S4

-52.9681

-3.20E-02

1.10E-02

-2.63E-03

2.36E-05

1.31E-04

-1.99E-05

S5

-7.72

-1.46E-02

2.44E-03

-4.83E-04

6.08E-05

-3.30E-06

-1.56E-08

S8

-8.78

-3.16E-03

1.91E-04

-3.58E-05

-4.18E-06

1.53E-06

-1.01E-07

S9

0.8026

-1.92E-03

-3.42E-04

-1.20E-05

-1.78E-06

4.16E-07

-5.25E-08

S10

1.4419

-1.72E-03

-1.35E-03

3.76E-04

-1.15E-04

1.95E-05

-1.46E-06

S11

-31.4

-0.0252

7.14E-03

-1.40E-03

1.27E-04

1.32E-06

-7.62E-07

Embodiment three

As shown in Figure 14 to Figure 19, f=4.14mm, F#=2.0, FOV=110 ° in the third embodiment, the focal length of each lens is as shown in the table:

f1	f2	f3	f4	f5	f2/f1	f4/f5	f1/f3
								-5.68	14.87	6.91	-5.05	6.957	-2.618	-0.7259	-0.822

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

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

K

A

B

C

D

E

F

S4

-52.9681

-2.87E-03

2.41E-03

-1.28E-03

3.94E-04

-6.06E-05

3.70E-06

S5

-7.72

-4.45E-04

-5.92E-04

4.71E-04

-1.19E-04

1.57E-05

-7.89E-07

S8

-8.78

-4.77E-03

3.90E-04

-4.41E-05

-5.80E-06

2.27E-06

-1.89E-07

S9

0.8026

5.11E-04

-3.53E-04

5.51E-05

3.19E-06

-4.73E-07

-7.20E-08

S10

1.4419

-1.75E-03

3.35E-04

-9.41E-05

4.55E-05

-6.16E-06

2.55E-07

S11

-31.4

-0.0118

2.81E-03

-4.16E-04

3.61E-05

-4.07E-07

-5.02E-08

Claims (8)

1. a day and night monitoring tight shot, it is characterized in that comprising successively first lens (1) with negative index from object plane to image planes, there are second lens (2) of positive refracting power, there are the 3rd lens (3) of positive refracting power, there is negative index the 4th lens (4), there are the 5th lens (5) of positive refracting power, filter plate (6) and sensitive film (7);

The focal length of described first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4) and the 5th lens (5) is respectively f1, f2, f3, f4 and f5, meet :-3 < f2/f1 <-2.6,-1.1 < f4/f5 <-0.7 ,-0.83 < f1/f3 <-0.55.

2. a kind of day and night monitoring tight shot according to claim 1, is characterized in that described first lens (1) are for curved month type glass spherical lens.

3. a kind of day and night monitoring tight shot according to claim 1, is characterized in that described second lens (2) are curved month type plastic aspheric lenes.

4. a kind of day and night monitoring tight shot according to claim 1, is characterized in that described 3rd lens (3) are biconvex glass spherical lens.

5. a kind of day and night monitoring tight shot according to claim 1, is characterized in that described 4th lens (4) are double concave type plastic aspheric lenes.

6. a kind of day and night monitoring tight shot according to claim 1, is characterized in that described 5th lens (5) are biconvex plastic aspheric lenes.

7. a kind of day and night monitors tight shot according to claim 1, it is characterized in that described first lens (1) are hither plane towards the surface of object plane, and is concave surface towards the surface of image planes; Described second lens (2) are concave surface towards the surface of object plane, and are convex surface towards the surface of image planes.

8. a kind of day and night monitoring tight shot according to any one of claim 1-7, is characterized in that the Abbe number having a slice lens in described first lens (1), the second lens (2), the 3rd lens (3), the 4th lens (4) and the 5th lens (5) at least meets: vd > 80.