CN103558677B - A kind of without thermalization monitoring camera - Google Patents
A kind of without thermalization monitoring camera Download PDFInfo
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- CN103558677B CN103558677B CN201310556392.5A CN201310556392A CN103558677B CN 103558677 B CN103558677 B CN 103558677B CN 201310556392 A CN201310556392 A CN 201310556392A CN 103558677 B CN103558677 B CN 103558677B
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- lens
- thermalization
- monitoring camera
- light coke
- positive light
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Abstract
The invention discloses a kind of without thermalization monitoring camera, from thing side starts, order includes: first lens with positive light coke; Second lens of positive light coke and the 3rd lens of negative power glue together the first cemented doublet of the positive light coke formed; Aperture member; 4th lens of negative power, glue together with the 5th lens of positive light coke the second cemented doublet forming positive light coke; 6th lens of negative power and positively related 7th lens of positive light coke, refractive index and temperature glue together the 3rd cemented doublet of the positive light coke formed; Have the curvature of positive light coke identical, refractive index and positively related 8th lens of temperature.The present invention by the first lens to the configuration of the 8th lens and diaphragm, can in the temperature range of-45 DEG C ~+85 DEG C spherical aberration corrector, astigmatism, coma, aberration, keep blur-free imaging, and ensure that picture element is stablized.
Description
[technical field]
The present invention relates to a kind of monitoring camera, be more particularly a kind of be applied to that operating ambient temperature changes greatly without thermalization monitoring camera.
[background technology]
Along with continuous expansion and the extension of safety monitoring camera lens application, increasing camera lens is used for various occasion, and various building ring mirror, thus it is also proposed more and more stricter requirement to the aspect such as building ring mirror temperature, pixel resolution of camera lens.As an important branch---the road monitoring of protection and monitor field, its requirement to camera lens is abnormal strict, requires that camera lens ensures without out of focus (i.e. imaging clearly) in the temperature range of-45 DEG C ~+85 DEG C.But traditional safety monitoring camera lens but cannot keep imaging clearly in the temperature range of-45 DEG C ~+85 DEG C, image quality is unstable, can not meet the demand of user.
Therefore, the present invention produces based on deficiency more than traditional monitoring camera just.
[summary of the invention]
The present invention seeks to overcome the deficiencies in the prior art, a kind of lightweight, compact conformation, imaging clearly are provided, there is the wide-angle safety monitoring of wide operating temperature range without thermalization camera lens.
The present invention is achieved by the following technical solutions:
A kind of without thermalization monitoring camera, it is characterized in that: from thing side starts, order includes:
Have the first lens of positive focal power, the first described lens are curved month type convex lens, convex surface facing object space, and concave surface facing image space;
Second lens, the 3rd lens, the second described lens are the convex lens of positive light coke, the 3rd described lens are the concavees lens of negative power, the second described lens and the 3rd described lens glue together the first cemented doublet forming positive light coke, the first described cemented doublet convex surface facing object space, concave surface facing image space;
Aperture member;
4th lens, the 5th lens, the 4th described lens are the biconcave lens of negative power, the 5th described lens are the biconvex lens of positive light coke, the 4th described lens and the 5th described lens glue together the second cemented doublet forming positive light coke, the concave surface facing object space of the second described cemented doublet, convex surface facing image space;
6th lens, the 7th lens, the 6th described lens are the concavees lens of negative power, the 7th described lens L7 is positive light coke and the 7th described lens L7 is the positively related glass convex lens of refractive index and temperature, the 6th described lens and the 7th described lens glue together the 3rd cemented doublet forming positive light coke, the concave surface facing object space of the 3rd described cemented doublet, convex surface facing image space;
Have the 8th lens of positive light coke, the object side surface of the 8th described lens and image interface have the radius-of-curvature of formed objects, and the 8th described lens are the positively related glass biconvex lens of refractive index and temperature;
As above a kind of without thermalization monitoring camera, it is characterized in that: the first described lens meet condition below: 1.85 >=Nd1 >=1.7,35 >=Vd1 >=23.5, wherein Nd1 represents the d optical index of the first lens material, and Vd1 represents the d light Abbe constant of the first lens material.
As above a kind of without thermalization monitoring camera, it is characterized in that: the first described focal length of lens f
l1with described without the total focal distance f of thermalization monitoring camera
f0between meet: 1.2f
f0>=f
l1>=0.8f
f0.
As above a kind of without thermalization monitoring camera, it is characterized in that: the second described lens meet condition below: 1.7 >=Nd2 >=1.6,64 >=Vd2 >=50, wherein Nd2 represents the d optical index of the second lens material, and Vd2 represents the d light Abbe constant of the second lens material.
As above a kind of without thermalization monitoring camera, it is characterized in that: the 3rd described lens meet condition below: 1.85 >=Nd3 >=1.6,35 >=Vd3 >=23.5, wherein Nd3 represents the d optical index of the 3rd lens material, and Vd3 represents the d light Abbe constant of the 3rd lens material.
As above a kind of without thermalization monitoring camera, it is characterized in that: the 4th described focal length of lens f
l4with the 5th described focal length of lens f
l5between meet :-0.4>=f
l4/ f
l5>=-1.2.
As above a kind of without thermalization monitoring camera, it is characterized in that: the 6th described focal length of lens f
l6with the 7th described focal length of lens f
l7between meet :-0.5>=f
l6/ f
l7>=-1.4.
As above a kind of without thermalization monitoring camera, it is characterized in that: the 8th described lens meet condition below: 1.93 >=Nd8 >=1.85,45 >=Vd8 >=25, wherein Nd8 represents the d optical index of the 8th lens material, and Vd8 represents the d light Abbe constant of the 8th lens material.
As above a kind of without thermalization monitoring camera, it is characterized in that: the focal distance f of the lens combination of the first described lens, the second lens, the 3rd lens composition
l1L2L3the focal distance f of the lens combination formed with the 4th lens, the 5th lens, the 6th lens, the 7th lens, the 8th lens
l4L5L6L7L8meet following formula: 2≤f
l1L2L3/ f
l4L5L6L7L8≤ 2.5.
Compared with prior art, the present invention has the following advantages:
1, the present invention by the first lens to the configuration of the 8th lens and diaphragm, can in the temperature range of-45 DEG C ~+85 DEG C spherical aberration corrector, astigmatism, coma, aberration, and can in Controlling and compensating camera lens metal spacer ring cause due to temperature variation airspace change, thus burnt null displacement after realizing, the stable of picture element is kept in comparatively large-temperature range (-45 DEG C ~+85 DEG C), make camera lens keep blur-free imaging in the temperature range of-45 DEG C ~+85 DEG C, and ensure that picture element is stablized.
2, the present invention is high without thermalization monitoring camera reliability, and compact conformation is lightweight.
3, the present invention is without thermalization monitoring camera manual focusing, without the need to power supply, cost-saving.
[accompanying drawing explanation]
Fig. 1 is structural representation of the present invention (thing side is positioned on the left of camera lens);
Fig. 2 is the present invention's MTF (modulation transfer function) curve map 25 DEG C time;
Fig. 3 is the present invention's out of focus curve map 25 DEG C time;
Fig. 4 is the present invention's out of focus curve map-45 DEG C time;
Fig. 5 is the present invention's out of focus curve map 85 DEG C time;
Fig. 6 is curvature of field curve map of the present invention;
Fig. 7 is distortion curve figure of the present invention.
[embodiment]
Below in conjunction with accompanying drawing, the invention will be further described:
Case study on implementation of the present invention as shown in Figure 1, is used in outdoor road monitoring.This camera lens includes successively from thing side: the first lens L1, the second lens L2, the 3rd lens L3, aperture member r8, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7, the 8th lens L8, optical filter IR-CUT, imaging surface IMA.
First lens L1 is the curved month type convex lens with positive light coke, and convex surface facing object space, concave surface facing image space, can spherical aberration corrector and astigmatism.
Second lens L2 is the convex lens of positive light coke, and the 3rd lens L3 is the concavees lens of negative power, and the second lens L2 and the 3rd lens L3 glues together the first cemented doublet J1 forming positive focal power, the first cemented doublet J1 convex surface facing object space, concave surface facing image space.First cemented doublet J1 can correct the aberration that the first lens L1 produces.
4th lens L4 is the biconcave lens of negative power, 5th lens L5 is the biconvex lens of positive light coke, 4th lens L4 and the 5th lens L5 glues together the second cemented doublet J2 forming positive focal power, and the concave surface facing object space of the second cemented doublet J2, convex surface facing image space.Second cemented doublet J2 can correct coma and astigmatism.
6th lens L6 is the concavees lens of negative power, 7th lens L7 is the positively related convex lens of positive light coke, refractive index and temperature, 6th lens L6 and the 7th lens L7 glues together the 3rd cemented doublet J3 forming positive focal power, and the concave surface facing object space of the 3rd cemented doublet J3, convex surface facing image space.3rd cemented doublet J3 can corrective system aberration.
8th lens L8 has positive light coke, refractive index and temperature positive correlation, glass biconvex lens that curvature is identical, can spherical aberration corrector, astigmatism and the curvature of field.8th lens L8 has same curvature radius, and processing and manufacturing is simple, can reduce production cost.
The 7th described lens L7 and the 8th lens L8 is refractive index and the positively related glass mirror of temperature, can in Controlling and compensating camera lens metal spacer ring (GQ1, GQ2, GQ3, GQ4) cause due to temperature variation airspace change, thus burnt null displacement after realizing, in comparatively large-temperature range (-45 DEG C ~+85 DEG C), keep stablizing of picture element.
Aperture member r8 is located between the 3rd lens L3 and the 4th lens L4, and the large airspace between the 3rd lens L3 and the 4th lens L4 is suitable for unrestricted choice within it and arranges automatic diaphragm element or manual iris element.
Optimal way as the present embodiment:
First lens L1 meets condition below: 1.85 >=Nd1 >=1.7,35 >=Vd1 >=23.5, and wherein Nd1 represents the d optical index of the first lens L1 material, and Vd1 represents the d light Abbe constant of the first lens L1 material.
First lens L1 focal distance f
l1with without the total focal distance f of thermalization camera lens
f0between meet: 1.2f
f0>=f
l1>=0.8f
f0.
Second lens L2 meets condition below: 1.7 >=Nd2 >=1.6,64 >=Vd2 >=50, and wherein Nd2 represents the d optical index of the second lens L2 material, and Vd2 represents the d light Abbe constant of the second lens L2 material.
The 3rd described lens L3 meets condition below: 1.85 >=Nd3 >=1.6,35 >=Vd3 >=23.5, and wherein Nd3 represents the d optical index of the 3rd lens L3 material, and Vd3 represents the d light Abbe constant of the 3rd lens L3 material.
4th lens L4 focal distance f
l4with the 5th lens L5 focal distance f
l5between meet :-0.4>=f
l4/ f
l5>=-1.2.
6th lens L6 focal distance f
l6with the 7th lens L7 focal distance f
l7between meet :-0.5>=f
l6/ f
l7>=-1.4.
8th lens L8 meets condition below: 1.93 >=Nd8 >=1.85,45 >=Vd8 >=25, and wherein Nd8 represents the d optical index of the 8th lens L8 material, and Vd8 represents the d light Abbe constant of the 8th lens L8 material.
The cemented surface of the second lens L2 and the 3rd lens L3 is plane, and such structure is applicable to the multi-disc processing of eyeglass, greatly reduces production cost.
First lens L1 employing height reflects, high chromatic dispersion material is made, and high refraction is conducive to the spherical aberration of large aperture generation, and high dispersion is conducive to the aberration of the lens combination before balance aperture member r8 and lens combination generation below.
The focal distance f of the lens combination that the first described lens L1, the second lens L2, the 3rd lens L3 form
l1L2L3the focal distance f of the lens combination formed with the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7, the 8th lens L8
l4L5L6L7L8meet following formula: 2≤f
l1L2L3/ f
l4L5L6L7L8≤ 2.5.
Fig. 2 to Fig. 7 is the optical performance curve figure corresponding to embodiment.Fig. 2 is the present invention's MTF (modulation transfer function) curve map 25 DEG C time, and modulation transfer function (MTF) is under certain space frequency, the function than space frequency of degree of modulation between actual picture and desirable picture.MTF curvilinear abscissa is spatial frequency lp/mm (every millimeter line to), and ordinate is contrast (%).Curve is higher, shows that image quality is better.Different curves represents different image heights, T and S represents the MTF in meridian and sagitta of arc direction respectively.Known by Fig. 2, in full filed, resolving power reaches 90lp/mm>45%, meets camera lens 8,000,000 pixel request completely; Fig. 3 is the present invention's out of focus curve map 25 DEG C time, out of focus curve shows the relation of meridian, sagitta of arc MTF and defocusing amount to the different visual field of setting space frequency, in figure, horizontal ordinate is defocusing amount, ordinate is contrast, can find out that whether the optimal focal plane of each visual field is relatively more consistent by this figure, whether MTF is more responsive to out of focus.Each visual field optimal focal plane is basically identical as shown in Figure 3, and each visual field picture element is evenly clear; Fig. 4 is the present invention's out of focus curve map-45 DEG C time, and as shown in Figure 4 when low temperature-45 DEG C, compared with 25 DEG C of out of focus curves, without obvious out of focus, picture element is clear; Fig. 5 is the present invention's out of focus curve map 85 DEG C time, and as shown in Figure 5 when high temperature 85 DEG C, compared with 25 DEG C of out of focus curves, without obvious out of focus, picture element is clear; Fig. 6 is curvature of field curve map of the present invention, by F, d, C (F=0.486um commonly used, d=0.588um, C=0.656um) wavelength of three coloured light represents, T and S represents meridian and sagitta of arc amount respectively, and ordinate is visual field, and unit is angle, horizontal ordinate is the curvature of field, and unit is millimeter (mm); Fig. 7 is distortion curve figure of the present invention, and ordinate is visual field, and horizontal ordinate is the percent value of distortion.Distortion curve figure represents the distortion sizes values in different field angle situation, and unit is %, and the optics of system abnormal change ∣ TVdistortion ∣≤5%, belongs to little distortion as shown in Figure 7, meets the designing requirement of road monitoring to distortion.So, from Fig. 2 to Fig. 7, this optical lens by various aberration correction to a good level.
In the implementation case, optical system preferred parameter value is as following table:
| Effective focal length | 40mm |
| F/# (aperture) | 1.9 |
| Burnt after optics | 21.6mm |
| Field angle | 33° |
The value of corresponding each element is as following table
In upper table, radius-of-curvature refers to the radius-of-curvature on each surface, and spacing refers to the distance between two adjacently situated surfaces, for example, and the spacing on surface 1, the distance namely between surface 1 and surface 2.Refractive index and Abbe number are refractive index and the Abbe number of corresponding element, and for example, the refractive index of the second lens L2 is 63.4, Abbe number is 1.62; The refractive index of the 3rd lens L3 is 27.5, Abbe number is 1.77.
Claims (8)
1. without a thermalization monitoring camera, it is characterized in that: from thing side starts, order includes:
Have first lens (L1) of positive focal power, described the first lens (L1) are curved month type convex lens, convex surface facing object space, and concave surface facing image space;
Second lens (L2), the 3rd lens (L3), the convex lens that described the second lens (L2) are positive light coke, the concavees lens that the 3rd described lens (L3) are negative power, described the second lens (L2) and the 3rd described lens (L3) glue together the first cemented doublet (J1) forming positive light coke, described the first cemented doublet (J1) convex surface facing object space, concave surface facing image space;
Aperture member (r8);
4th lens (L4), the 5th lens (L5), the biconcave lens that the 4th described lens (L4) are negative power, the biconvex lens that the 5th described lens (L5) are positive light coke, the 4th described lens (L4) and the 5th described lens (L5) glue together the second cemented doublet (J2) forming positive light coke, the concave surface facing object space of described the second cemented doublet (J2), convex surface facing image space;
6th lens (L6), the 7th lens (L7), the concavees lens that the 6th described lens (L6) are negative power, the 7th described lens (L7) are for positive light coke and the 7th described lens (L7) are refractive index and the positively related glass convex lens of temperature, the 6th described lens (L6) and the 7th described lens (L7) glue together the 3rd cemented doublet (J3) forming positive light coke, the concave surface facing object space of the 3rd described cemented doublet (J3), convex surface facing image space;
There are the 8th lens (L8) of positive light coke, the object side surface of the 8th described lens (L8) and image interface have the radius-of-curvature of formed objects, and the 8th described lens (L8) are refractive index and the positively related glass biconvex lens of temperature;
Described the first lens (L1) meet condition below: 1.85 >=Nd1 >=1.7,35 >=Vd1 >=23.5, wherein Nd1 represents the d optical index of the first lens (L1) material, and Vd1 represents the d light Abbe constant of the first lens (L1) material.
2. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: described the first lens (L1) focal distance f
l1with described without the total focal distance f of thermalization monitoring camera
f0between meet: 1.2f
f0>=f
l1>=0.8f
f0.
3. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: described the second lens (L2) meet condition below: 1.7 >=Nd2 >=1.6,64 >=Vd2 >=50, wherein Nd2 represents the d optical index of the second lens (L2) material, and Vd2 represents the d light Abbe constant of the second lens (L2) material.
4. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: the 3rd described lens (L3) meet condition below: 1.85 >=Nd3 >=1.6,35 >=Vd3 >=23.5, wherein Nd3 represents the d optical index of the 3rd lens (L3) material, and Vd3 represents the d light Abbe constant of the 3rd lens (L3) material.
5. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: the 4th described lens (L4) focal distance f
l4with the 5th described lens (L5) focal distance f
l5between meet :-0.4>=f
l4/ f
l5>=-1.2.
6. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: the 6th described lens (L6) focal distance f
l6with the 7th described lens (L7) focal distance f
l7between meet :-0.5>=f
l6/ f
l7>=-1.4.
7. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: the 8th described lens (L8) meet condition below: 1.93 >=Nd8 >=1.85,45 >=Vd8 >=25, wherein Nd8 represents the d optical index of the 8th lens (L8) material, and Vd8 represents the d light Abbe constant of the 8th lens (L8) material.
8. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: the focal distance f of the lens combination that described the first lens (L1), the second lens (L2), the 3rd lens (L3) form
l1L2L3the focal distance f of the lens combination formed with the 4th lens (L4), the 5th lens (L5), the 6th lens (L6), the 7th lens (L7), the 8th lens (L8)
l4L5L6L7L8meet following formula: 2≤f
l1L2L3/ f
l4L5L6L7L8≤ 2.5.
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