CN103558677A - Athermal monitoring camera lens - Google Patents
Athermal monitoring camera lens Download PDFInfo
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- CN103558677A CN103558677A CN201310556392.5A CN201310556392A CN103558677A CN 103558677 A CN103558677 A CN 103558677A CN 201310556392 A CN201310556392 A CN 201310556392A CN 103558677 A CN103558677 A CN 103558677A
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Abstract
The invention discloses an athermal monitoring camera lens. The athermal monitoring camera lens comprises a first lens having positive focal power, a first gluing type lens which is formed by gluing of a second lens having positive focal power and a third lens having negative focal power and has positive focal power, a diaphragm element, a second gluing lens which is formed by gluing of a fourth lens having negative focal power and a fifth lens having positive focal power and has positive focal power, a third gluing type lens which is formed by gluing of a sixth lens having negative focal power and a seventh lens having positive focal power and has positive focal power, and an eighth lens having positive focal power, wherein the first lens, the first gluing type lens, the diaphragm element, the second gluing lens, the third gluing type lens and the eighth lens are arranged in sequence from the object side, positive correlation exists between the refraction index and the temperature of the seventh lens, the curvatures of the two surfaces of the eighth lens are the same, and positive correlation exists between the refraction index and the temperature of the eighth lens. According to the athermal monitoring camera lens, due to the arrangement of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the diaphragm element, the spherical aberration, astigmatism, coma aberration and chromatic aberration can be corrected within the temperature range from -45 DEG C to +85 DEG C, clear images are kept, and stability of image quality is guaranteed.
Description
[technical field]
The present invention relates to a kind of monitoring camera, more specifically say a kind of be applied to operating ambient temperature change 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 occasions, various building ring mirrors, thereby the aspects such as the building ring mirror temperature of camera lens, pixel resolution have also been proposed to more and more stricter requirement.As an important branch---the road monitoring of protection and monitor field, it is extremely strict to the requirement of camera lens, requires camera lens to guarantee without out of focus (being imaging clearly) in the temperature range of-45 ℃～+ 85 ℃.But traditional safety monitoring camera lens but cannot keep imaging clearly in the temperature range of-45 ℃～+ 85 ℃, and image quality is unstable, can not meet user's demand.
Therefore, the present invention just the deficiency more than monitoring camera based on traditional produce.
[summary of the invention]
The present invention seeks to have overcome the deficiencies in the prior art, the wide-angle safety monitoring that provide a kind of lightweight, compact conformation, imaging clearly, has wide operating temperature range is without thermalization camera lens.
The present invention is achieved by the following technical solutions:
A thermalization monitoring camera, is characterized in that: from thing side starts, order includes:
The first lens with positive focal power, described first lens is curved month type convex lens, and convex surface is towards object space, and concave surface is towards image space;
The second lens, the 3rd lens, the convex lens that the second described lens are positive light coke, the concavees lens that the 3rd described lens are negative power, the second described lens and described the 3rd lens gummed form the first gummed eyeglass of positive light coke, the convex surface of the first described gummed eyeglass is towards object space, and concave surface is towards image space;
Aperture member;
The 4th lens, the 5th lens, the biconcave lens that the 4th described lens are negative power, the biconvex lens that the 5th described lens are positive light coke, the 4th described lens and described the 5th lens gummed form the second gummed eyeglass of positive light coke, the concave surface of the second described gummed eyeglass is towards object space, and convex surface is towards image space;
The 6th lens, the 7th lens, the concavees lens that the 6th described lens are negative power, the 7th described lens are the positively related glass convex lens of positive light coke, refractive index and temperature, the 6th described lens and described the 7th lens gummed form the 3rd gummed eyeglass of positive light coke, the concave surface of the 3rd described gummed eyeglass is towards object space, and convex surface is towards image space;
The 8th identical lens of curvature with positive light coke, 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: described first lens meets condition below: 1.85 >=Nd >=1.7,35 >=Vd >=23.5, wherein Nd represents the d optical index of first lens material, Vd represents the d light Abbe constant of first lens material.
As above a kind of without thermalization monitoring camera, it is characterized in that: described first lens focal distance f
l1with described without the total focal distance f of thermalization camera lens
f0between meet: 0.8f
f0>=f
l1>=1.2f
f0.
As above a kind of without thermalization monitoring camera, it is characterized in that: the second described lens meet condition below: 1.7 >=Nd >=1.6,64 >=Vd >=50, wherein Nd represents the d optical index of the second lens material, Vd 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 >=Nd >=1.6,35 >=Vd >=23.5, wherein Nd represents the d optical index of the 3rd lens material, Vd 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 :-1.2>=f
l4/ f
l5>=-0.4.
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 :-1.4>=f
l6/ f
l7>=-0.5.
As above a kind of without thermalization monitoring camera, it is characterized in that: the 8th described lens meet condition below: 1.93 >=Nd >=1.85,45 >=Vd >=25, wherein Nd represents the d optical index of the 8th lens material, Vd 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 cemented surface between the second described lens and described the 3rd lens, described the 4th lens and described the 5th lens, described the 6th lens and described the 7th lens is plane.
As above a kind of without thermalization monitoring camera, it is characterized in that: the focal distance f of the lens combination that described first lens, the second lens, the 3rd lens form
l1L2L3the focal distance f of the lens combination forming 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 is by the configuration of first lens to the eight lens and diaphragm, can be in the temperature range of-45 ℃～+ 85 ℃ spherical aberration corrector, astigmatism, coma, aberration, and can proofread and correct with produced color difference in metal spacer ring due to temperature variation cause airspace change, thereby burnt null displacement after realizing, in compared with large-temperature range (45 ℃～+ 85 ℃), keep the stable of picture element, make camera lens keep blur-free imaging in the temperature range of-45 ℃～+ 85 ℃, and guarantee that picture element is stable.
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 power supply, cost-saving.
[accompanying drawing explanation]
Fig. 1 is structural representation of the present invention (thing side is positioned at camera lens left side);
Fig. 2 is the present invention's MTF(modulation transfer function in the time of 25 ℃) curve map;
Fig. 3 is the present invention's out of focus curve map in the time of 25 ℃;
Fig. 4 is the present invention's out of focus curve map in the time of-45 ℃;
Fig. 5 is the present invention's out of focus curve map in the time of 85 ℃;
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: 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 is towards object space, and concave surface, can spherical aberration corrector and astigmatism towards image space.
The convex lens that the second lens L2 is positive light coke, the concavees lens that the 3rd lens L3 is negative power, the second lens L2 and the 3rd lens L3 gummed form the first gummed eyeglass J1 of positive focal power, and the convex surface of the first gummed eyeglass J1 is towards object space, and concave surface is towards image space.The first gummed eyeglass J1 can proofread and correct the aberration that first lens L1 produces.
The biconcave lens that the 4th lens L4 is negative power, the biconvex lens that the 5th lens L5 is positive light coke, the 4th lens L4 and the 5th lens L5 gummed form the second gummed eyeglass J2 of positive focal power, and the concave surface of the second gummed eyeglass J2 is towards object space, and convex surface is towards image space.The second gummed eyeglass J2 can proofread and correct coma and astigmatism.
The concavees lens that the 6th lens L6 is negative power, the 7th lens L7 is the positively related convex lens of positive light coke, refractive index and temperature, the 6th lens L6 and the 7th lens L7 gummed form the 3rd gummed eyeglass J3 of positive focal power, and the concave surface of the 3rd gummed eyeglass J3 is towards object space, and convex surface is towards image space.The 3rd gummed eyeglass J3 can corrective system aberration.
The 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.The 8th lens L8 has same curvature radius, and processing and manufacturing is simple, can reduce production costs.
The 7th described lens L7 and the 8th lens L8 are refractive index and the positively related glass mirror of temperature, can proofread and correct with produced color difference in metal spacer ring (GQ1, GQ2, GQ3, GQ4) due to temperature variation cause airspace change, thereby burnt null displacement after realizing keeps the stable of picture element in compared with large-temperature range (45 ℃～+ 85 ℃).
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 freely selecting to arrange automatic diaphragm element or manual iris element within it.
Optimal way as the present embodiment:
First lens L1 meets condition below: 1.85 >=Nd >=1.7, and 35 >=Vd >=23.5, wherein Nd represents the d optical index of first lens L1 material, Vd represents the d light Abbe constant of first lens L1 material.
First lens L1 focal distance f
l1with without the total focal distance f of thermalization camera lens
f0between meet: 0.8f
f0>=f
l1>=1.2f
f0.
The second lens L2 meets condition below: 1.7 >=Nd >=1.6, and 64 >=Vd >=50, wherein Nd represents the d optical index of the second lens L2 material, Vd represents the d light Abbe constant of the second lens L2 material.
The 3rd described lens L3 meets condition below: 1.85 >=Nd >=1.6, and 35 >=Vd >=23.5, wherein Nd represents the d optical index of the 3rd lens L3 material, Vd represents the d light Abbe constant of the 3rd lens L3 material.
The 4th lens L4 focal distance f
l4with the 5th lens L5 focal distance f
l5between meet :-1.2>=f
l4/ f
l5>=-0.4.
The 6th lens L6 focal distance f
l6with the 7th lens L7 focal distance f
l7between meet :-1.4>=f
l6/ f
l7>=-0.5.
The 8th lens L8 meets condition below: 1.93 >=Nd >=1.85, and 45 >=Vd >=25, wherein Nd represents the d optical index of the 8th lens L8 material, Vd 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, the 4th lens L4 and the 5th lens L5, the 6th lens L6 and the 7th lens L7 is plane, and such structure is applicable to the multi-disc processing of eyeglass, greatly reduces production cost.
First lens L1 adopts high refraction, high chromatic dispersion material to make, and high refraction is conducive to the spherical aberration that large aperture produces, and high dispersion is conducive to lens combination before balance aperture member r8 and the aberration of the generation of lens combination below.
The focal distance f of the lens combination that described first lens L1, the second lens L2, the 3rd lens L3 form
l1L2L3the focal distance f of the lens combination forming 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 in the time of 25 ℃) curve map, modulation transfer function (MTF) is under certain space frequency, degree of modulation than the function of space frequency between actual picture and ideal picture.MTF curve horizontal ordinate be every millimeter of line of spatial frequency lp/mm(to), ordinate is contrast (%).Curve is higher, shows that image quality is better.Different curves represents different image heights, and T and S represent respectively the MTF of meridian and sagitta of arc direction.By Fig. 2, known, in full visual field, resolving power reaches 90lp/mm>45%, meets camera lens 8,000,000 pixel requests completely; Fig. 3 is the present invention's out of focus curve map in the time of 25 ℃, out of focus curve shows the relation to meridian, sagitta of arc MTF and the defocusing amount of the different visual fields of setting space frequency, in figure, horizontal ordinate is defocusing amount, ordinate is contrast, whether the optimal focal plane that can find out each visual field by this figure is more consistent, and 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 in the time of-45 ℃, during as shown in Figure 4 in low temperature-45 ℃, compares with 25 ℃ of out of focus curves, and without obvious out of focus, picture element is clear; Fig. 5 is the present invention's out of focus curve map in the time of 85 ℃, when 85 ℃ of high temperature, compares with 25 ℃ of out of focus curves as shown in Figure 5, and without obvious out of focus, picture element is clear; Fig. 6 is curvature of field curve map of the present invention, by the F commonly using, d, C(F=0.486um, d=0.588um, C=0.656um) three look light wavelengths represent, T and S represent respectively meridian and sagitta of arc amount, and ordinate is visual field, unit is angle, and 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 situations, and unit is %, and the abnormal change of the optics of system ∣ 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 is by various aberration corrections to 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 each corresponding element is as following table
In upper table, radius-of-curvature refers to the radius-of-curvature that each is surperficial, and spacing refers to the distance between two adjacently situated surfaces, for instance, and the spacing on surface 1, i.e. distance between surface 1 and surface 2.Refractive index and Abbe number are refractive index and the Abbe numbers of corresponding element, and for instance, 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 (10)
1. without a thermalization monitoring camera, it is characterized in that: from thing side starts, order includes:
The first lens (L1) with positive focal power, described first lens (L1) is curved month type convex lens, and convex surface is towards object space, and concave surface is towards image space;
The 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) glue together with the 3rd described lens (L3) the first gummed eyeglass (J1) that forms positive light coke, the convex surface of the first described gummed eyeglass (J1) is towards object space, and concave surface is towards image space;
Aperture member (r8);
The 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) glue together with the 5th described lens (L5) the second gummed eyeglass (J2) that forms positive light coke, the concave surface of the second described gummed eyeglass (J2) is towards object space, and convex surface is towards image space;
The 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 the positively related glass convex lens of positive light coke, refractive index and temperature, the 6th described lens (L6) glue together with the 7th described lens (L7) the 3rd gummed eyeglass (J3) that forms positive light coke, the concave surface of the 3rd described gummed eyeglass (J3) is towards object space, and convex surface is towards image space;
The 8th identical lens (L8) of curvature with positive light coke, the 8th described lens (L8) are the positively related glass biconvex lens of refractive index and temperature;
2. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: described first lens (L1) meets condition below: 1.85 >=Nd >=1.7,35 >=Vd >=23.5, wherein Nd represents the d optical index of first lens (L1) material, and Vd represents the d light Abbe constant of first lens (L1) material.
3. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: described first lens (L1) focal distance f
l1with described without the total focal distance f of thermalization camera lens
f0between meet: 0.8f
f0>=f
l1>=1.2f
f0.
4. 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 >=Nd >=1.6,64 >=Vd >=50, wherein Nd represents the d optical index of the second lens (L2) material, and Vd represents the d light Abbe constant of the second lens (L2) material.
5. 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 >=Nd >=1.6,35 >=Vd >=23.5, wherein Nd represents the d optical index of the 3rd lens (L3) material, and Vd represents the d light Abbe constant of the 3rd lens (L3) material.
6. 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 :-1.2>=f
l4/ f
l5>=-0.4.
7. 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 :-1.4>=f
l6/ f
l7>=-0.5.
8. 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 >=Nd >=1.85,45 >=Vd >=25, wherein Nd represents the d optical index of the 8th lens (L8) material, and Vd represents the d light Abbe constant of the 8th lens (L8) material.
9. according to claim 1 a kind of without thermalization monitoring camera, it is characterized in that: the cemented surface between described the second lens (L2) and described the 3rd lens (L3), described the 4th lens (L4) and described the 5th lens (L5), described the 6th lens (L6) and described the 7th lens (L7) is plane.
10. 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 first lens (L1), the second lens (L2), the 3rd lens (L3) form
l1L2L3the focal distance f of the lens combination forming 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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