A kind of high-low temperature resistant, high resolving power, the optical system day and night shared[technical field]
The present invention relates to a kind of optical system, especially relate to that a kind of structure being applied to vehicle-mounted, safety-protection system is simple, high-low temperature resistant, high resolving power, the optical system that day and night shares.
[background technology]
The high resolving power of vehicle-mounted, security protection at present, the shortcoming that day and night optical system shared ubiquity is such: cost is high, not high-low temperature resistant, serviceable life short, complex structure, can not be general etc.Also do not have camera lens can overcome above-mentioned shortcoming in the market simultaneously, only having minority camera lens, improving in certain when sacrificing other side, such as low in order to realize cost, just make system bulk increase or reduce, can not be general with camera lens in the market; The not even high-low temperature resistant had, serviceable life reduce, use procedure is affected by environment very large, clear picture can be photographed under normal temperature, but high temperature and low temperature environment can not photograph picture clearly, or under complex environment, use very short time system with regard to cisco unity malfunction etc., can not meet far away vehicle-mounted, safety-protection system requirement in complex environment hypograph sharpness and authenticity and normally to use for a long time, also do not overcome the camera lens of above whole shortcoming in the market.
The present invention makes in view of the situation.
[summary of the invention]
The present invention seeks to overcome prior art cost high, not high-low temperature resistant, life-span short, complex structure, can not with the deficiency such as conventional camera lens on market is general, provide that a kind of structure is simple, high-low temperature resistant, high resolving power, the optical system that day and night shares.
The present invention is achieved by the following technical solutions:
A kind of high-low temperature resistant, high resolving power, the optical system day and night shared, it is characterized in that: from subject to image planes, 6 include the first lens 1, diaphragm 2, second lens 3, the 3rd lens 4 and optical filter 5 successively, described first lens 1 for focal power be negative non-spherical lens, described second lens 3 for focal power be positive non-spherical lens, described 3rd lens 4 for focal power be negative non-spherical lens.
High-low temperature resistant as above, high resolving power, the optical system day and night shared, it is characterized in that: the first described lens 1 are falcate non-spherical lens, the second described lens 3 are lenticular non-spherical lens, and the 3rd described lens 4 are falcate non-spherical lens.
High-low temperature resistant as above, high resolving power, the optical system day and night shared, it is characterized in that: the A face of described first lens 1 is oval aspheric surface, the B face of described first lens 1 is hyperbolic curve aspheric surface; The C face of described second lens 3 is oval aspheric surface, and the D face of described second lens 3 is hyperbolic curve aspheric surface; The E face of described 3rd lens 4 and the F face of the 3rd lens 4 are hyperbolic curve aspheric surface.
High-low temperature resistant as above, high resolving power, the optical system day and night shared, is characterized in that: the first described lens 1, second lens 3, the 3rd lens 4 are plastic material.
High-low temperature resistant as above, high resolving power, the optical system day and night shared, it is characterized in that: the B face of described first lens 1 bends towards diaphragm 2, the E face of described 3rd lens 4 bends towards diaphragm 2.
High-low temperature resistant as above, high resolving power, the optical system day and night shared, is characterized in that: described first lens 1, second lens 3, the aspheric surface configuration of the 3rd lens 4 meet following equation:
Compared with prior art, the present invention has the following advantages:
1, in the market most of high resolving power, day and night optical system sharedly generally adopt special material, cost is higher, and structure is more complicated; The present invention has only used three pieces of glass lens, and structure is simple, and cost is low.
2, optical system for high resolution, in order to improve resolution, reduces costs in the market, causes system not high-low temperature resistant, can become picture rich in detail at normal temperatures, but at high temperature, low temperature or more all can not get a distinct image under complex environment; The present invention can both photograph picture rich in detail from low temperature to high temperature, even can get a distinct image to superhigh temperature 90 DEG C and more complicated rugged environment from ultralow temperature-50 DEG C.
3, most of optical system for high resolution, in order to improve resolution, reduce costs, does not consider the versatility of camera lens and control, output system in the market, causes camera lens must to arrange in pairs or groups separately the contour structures of control, output system and complete machine, very inconvenient; The versatility between camera lens is considered in the present invention's design, can be general, very convenient with a series of camera lenses common in the market.
4, common in the market high resolving power, day and night sharing system can only by day or evening can imaging clearly, but under the environment that visible ray and infrared light use simultaneously like this under similar dusk, night street lamp, can not imaging clearly; No matter by day visible ray of the present invention and infrared light are completely confocal, can both become image clearly under the environment that simultaneously uses of evening or visible ray and infrared light.
5, this invention also solves with glass mirror processing difficulties in front glass and glass plastic mixed structure, problem that the high yields caused of assembly precision requirement is low.
[accompanying drawing explanation]
Fig. 1 is optical system diagram of the present invention.
In figure; 1 is the first lens; 2 is diaphragm; 3 is the second lens; 4 is the 3rd lens; 5 is optical filter; 6 is image planes.
[embodiment]
Below in conjunction with accompanying drawing, the technology of the present invention feature is described in further detail so that described those skilled in the art can understand.
As shown in Figure 1, a kind of structure is simple, high-low temperature resistant, high resolving power, the optical system that day and night shares, from subject to image planes, 6 include the first lens 1, diaphragm 2, second lens 3, the 3rd lens 4 and optical filter 5 successively.Described first lens 1 are falcate non-spherical lens, and its focal power is negative, and material is plastics, and the A face of the first lens is oval aspheric surface, and the B face of the first lens is hyperbolic curve aspheric surface, and the B face of the first lens 1 bends towards diaphragm; Second lens 3 are lenticular non-spherical lens, and its focal power is just, material is plastics, and the C face of the second lens 3 is oval aspheric surface, and the D face of the second lens 3 is hyperbolic curve aspheric surface; 3rd lens 4 are falcate non-spherical lens, and its focal power is negative, and material is plastics, and the E face of the 3rd lens 4 and the F face of the 3rd lens 4 are hyperbolic curve aspheric surface, and the E face of the 3rd lens 4 bends towards diaphragm 2.
In order to realize, structure is simple, cost is low, design time system adopts all-plastic, and adopt the simplest three-chip type structure at present, not only make structure reach to simplify most, Material Cost drops to minimum, consider aspherical mirror machining cost, during design, aspheric surface adopts the most frequently used processing technology as far as possible simultaneously, processing cost is dropped to minimum; In addition, design process fully optimizes tolerance, reduces assembly precision as far as possible and reaches reduction assembly cost, make the cost control of the whole process of system to minimum.
In order to realize high-low temperature resistant, during design, the first lens 1, the 3rd lens 4 adopt negative power aspheric surface, second lens 3 adopt positive light coke aspheric surface, to utilize after diaphragm 2 and near the eyeglass of diaphragm 2 to temperature this characteristic more responsive, during temperature variation, the change of two minus power lens focal powers compensates the change of a positive light coke lens powers, when making to vary with temperature, the focal power of whole system has very little variable quantity, effectively improves the systemic resolution caused by temperature variation and declines; In addition, in system, the two sides of the 3rd lens 4 is hyperbolic curve aspheric surface, can be good at the curvature of field of correction system, and make system no matter be high temperature or low temperature, there is quite high resolution at image plane center and edge.
General in order to realize with camera lens on market, during design, the first lens 1 adopt minus power lens, after diaphragm 2 is placed on the first lens 1, and the B face of the first lens 1 bends towards diaphragm 2, the field angle of system can not only be increased, also can the tendency of good control system light, the first lens 1 and diaphragm 2 and the distance between diaphragm 2 and the second lens 3 can be strengthened simultaneously; In addition, the material that the second lens 3 adopt refractive index lower, effectively increases rear Jiao of system, ensure that the volume of conventional camera lens on the volume of whole system and market is suitable.
Infrared completely confocal in order to realize, the second lens 3 adopt low dispersion, and the 3rd lens 4 adopt higher dispersive plastic aspheric surface, and two eyeglass intervals are less, closely cooperate, and serve the effect that aberration corrected by bonding eyeglass; In addition, high chromatic dispersion material and low chromatic dispersion material with the use of, also can well correct the second order spectrum caused by infrared light, make white light and infrared light can become in image planes clearly as.
Adopt wide spectral when the present invention designs, and the theoretical resolution of design is far above actual needs value, ensure that image sharpness and color reducibility.
Lift an actual design case below:
| Face is numbered | Face type | Radius | Thickness | Material | Effective diameter |
| OBJ | Object plane | infinity | infinity | —— | infinity |
| A | Aspheric surface | 80.3860 | 0.8546 | APL5014CL | 9.1 |
| B | Aspheric surface | 4.0275 | 8.6782 | —— | 6.8 |
| STO | Diaphragm face | infinity | 3.8237 | —— | 2.8 |
| C | Aspheric surface | 3.2571 | 2.4675 | F4520 | 6.9 |
| D | Aspheric surface | -2.2653 | 0.3358 | SP-1516 | 4.7 |
| E | Aspheric surface | -1.2719 | 0.4227 | —— | 4.7 |
| F | Aspheric surface | -6.1752 | 0.1000 | —— | 3.6 |
| Standard | infinity | 0.8000 | H-K9L | 3.7 |
| Standard | infinity | 5.2171 | —— | 3.7 |
| IMA | Image planes | infinity | —— | —— | 4.9 |
In system, the first lens 1, second lens 3, the aspheric surface configuration of the 3rd lens 4 meet conventional aspheric equation:
In formula, the curvature of parameter c corresponding to radius, y is that its unit of radial coordinate is identical with length of lens unit, and k is circular cone whose conic coefficient.When k-factor is less than-1, face type curve is hyperbolic curve, is para-curve when equaling-1, is oval time between-1 to 0, is circle when equaling 0.A1to a8represent the coefficient corresponding to each radial coordinate respectively, accurately can be set the geomery of both-sided aspherical before and after lens by above parameter, above-mentioned aspheric processing is all normal processing technology.
The asphericity coefficient of lens is as following table:
| The A face of the first lens | The B face of the first lens |
| k | 29.867202 | -1.225538 |
| a2 | 0.000615324 | 0.00295244 |
| a3 | -5.897639E-005 | 3.872235E-005 |
| a4 | 1.85244E-006 | -2.12379E-005 |
| a5 | -1.76112E-007 | 1.21562E-006 |
| a6 | -1.29718E-009 | -1.22074E-007 |
| a7 | -5.38176E-011 | 6.00381E-009 |
| The C face of the second lens | The D face of the second lens |
| k | -1.127823 | -0.370315 |
| a2 | 0.000583719 | 0.00602746 |
| a3 | -0.000332958 | 0.00187733 |
| a4 | -0.000235141 | -0.00044368 |
| a5 | 3.77215E-005 | -8.56223E-005 |
| a6 | -4.2231E-006 | 4.666321E-006 |
| a7 | 2.37996E-007 | -4.32115E-007 |
| The E face of the 3rd lens | The F face of the 3rd lens |
| k | -2.3358291 | -15.526134 |
| a2 | 0.01335824 | 0.014665731 |
| a3 | 0.00435892 | 0.001236721 |
| a4 | 0.00088347 | -0.00036571 |
| a5 | -0.0005829 | 0.000168532 |
| a6 | -0.0001188 | 3.152648E-005 |
| a7 | 7.33687E-005 | -5.81726E-005 |
Embodiment of the present invention is only the description carried out the preferred embodiment of the present invention; not inventive concept and scope are limited; under the prerequisite not departing from design philosophy of the present invention; the various modification that in this area, engineering technical personnel make technical scheme of the present invention and improvement, all should fall into protection scope of the present invention.