CN104238079A - Wide-angle lens - Google Patents
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- CN104238079A CN104238079A CN201410525088.9A CN201410525088A CN104238079A CN 104238079 A CN104238079 A CN 104238079A CN 201410525088 A CN201410525088 A CN 201410525088A CN 104238079 A CN104238079 A CN 104238079A
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Abstract
The invention discloses a wide-angle lens. The wide-angle lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens sequentially from the object side to the image side. The first lens is a plastic aspherical lens with negative refraction power, the second lens is a biconvex plus lens with a plastic aspherical lens, the third lens is a glass spherical lens with positive refraction power, the fourth lens is a plastic aspherical lens with negative refraction power, the fifth lens is a plastic aspherical lens, and focal power of all the lens satisfies the condition that f5<f2<f1<f3<f4, wherein f1, f2, f3, f4 and f5 are focal power of the first, second, third, fourth and fifth lens respectively. The first lens and the second lens collect wide-angle rays by adopting a minus lens and plus lens combination mode, so that an included angle between an off-axis primary ray and an optical axis can be reduced; due to the large focal power of the third lens, thermal shift can be corrected by the aid of the glass material, focal length change generated by temperature shift can be compensated effectively, and the problem of thermal shift caused when the lens is applied to severe environments at high and low temperature and the like is solved.
Description
Technical field
The invention belongs to photographic means technical field, specifically, relate to a kind of wide-angle lens.
Background technology
Along with the application of wide-angle lens is more and more wider, under some applications need to be applied to the rugged surroundings such as high temperature or low temperature, because current camera lens is mainly plastic construction, high/low temperature can produce very large rear Jiao's skew to the camera lens of general plastic construction, thus the quality of imaging can be affected, serious meeting causes image blur, and systematic parameter is unstable, the failure modes such as cisco unity malfunction.
Vary with temperature very little due to glass materials refractive index so can be good at eliminating temperature to the impact of system focal length, therefore the current problem solving thermal migration usually through a large amount of use glass materials, but due to the characteristic of glass material, the wide-angle lens of a large amount of use glass material easily produces distortion, and the distortion correction being difficult to it to produce is in desirable scope, in addition, if use the words of Glass aspheric can increase cost and increase product manufacturing difficulty, the versatility of final limit product.
Summary of the invention
The present invention uses glass material easily to produce the problem of distortion to solve existing wide-angle lens to adapt to high/low temperature rugged surroundings in a large number, propose a kind of wide-angle lens, decrease the use of glass material, high/low temperature rugged surroundings can either be adapted to, and also can eliminate the impact of thermal migration on system simultaneously.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of wide-angle lens, comprises from thing side successively to image side:
First lens, are plastic aspherical element eyeglass, have negative refractive power;
Second lens, for having the biconvex positive lens of plastic aspherical element eyeglass;
3rd lens, are glass spheric glass, have positive refracting power;
4th lens, are plastic aspherical element eyeglass, have negative refractive power;
5th lens are plastic aspherical element eyeglass,
Described each power of lens meets f5 < f2 < f1 < f3 < f4, and wherein, f1, f2, f3, f4, f5 are respectively the first lens to the 5th power of lens.
Further, described first lens have the convex first surface to object space and upper and lower side is plane and the recessed second surface to image space of middle position, at least described second surface is aspheric surface, the refractive index n1 of described first lens and dispersion range v1 meets: 1.5 < n1 < 1.6,50 < v1 < 60.The structure of the first lens adopts negative lens to carry out high angle scattered light collection, can effective bending axis outer visual field chief ray, makes it diminish relative to the angle of optical axis, and then reduces the size of set of pieces afterwards.
Further, the second described lens are have convex the 3rd surface to object space and upper and lower side is plane and middle position is convex surperficial to the 4th of image space, at least described 4th surface is aspheric surface, the refractive index n2 of described second lens and dispersion range v2 meets: 1.5 < n2 < 1.6,50 < v2 < 60.The second described lens adopt drum type lens, and its focal power is just, its effect is that the divergent rays that before making, group produces becomes parallel rays again through converging.
Further, fixed aperture is provided with between described second lens and the 3rd lens.What rear group of lens set of diaphragm adopted is general optical collection system, wherein organize first (being also the 3rd lens) afterwards and there is larger focal power, glass material is adopted in order to correct thermal migration, effectively compensation temperature can offset the focal length variations produced, the effect of the 3rd lens and the 4th lens is positive and negative lens combination color difference eliminatings, the micro lens incident angle that 4th lens and the 5th lens can make the outer chief ray of axle specify according to CMOS chip carries out deviation, preferably while guarantee illuminance uniformity is matched to image-position sensor.
Further, described 3rd lens have convex the 5th surface to object space and convex the 6th surface to image space, the refractive index n3 of described 3rd lens and dispersion range v3 meets: 1.5 < n3 < 1.7,40 < v3 < 60.
Further, described 4th lens have recessed the 7th surface to object space and recessed the 8th surface to image space, at least described 8th surface is aspheric surface, the refractive index n4 of described 4th lens and dispersion range v4 meets: 1.6 < n4 < 1.7,20 < v4 < 30.
Further, described 5th lens have convex the 9th surface to object space and convex the tenth surface to image space, at least described tenth surface is aspheric surface, the refractive index n5 of described 5th lens and dispersion range v5 meets: 1.5 < n5 < 1.7,50 < v5 < 60.
Further, the described 5th between lens and imaging side, optical filter is provided with.
Further, described optical filter is cutoff filter.
Compared with prior art, advantage of the present invention and good effect are: wide-angle lens of the present invention, first lens and the second lens adopt the mode of negative lens and positive lens combination to collect high angle scattered light, the angle of the outer chief ray of axle and optical axis can be reduced, and then reduction aberration gradually, 3rd lens adopt glass material to have larger focal power, due to glass material, to vary with temperature variations in refractive index little, and refractive index is the principal element affecting focal power, therefore the 3rd lens change to maintenance system temperature the focal power drift caused good inhibiting effect, glass material is adopted to correct thermal migration, effectively compensation temperature can offset the focal length variations produced, solve the thermal migration problem produced when camera lens is applied to the rugged surroundings such as high/low temperature, the positive and negative lens combination of the 3rd lens and the 4th lens is used for color difference eliminating, the micro lens incident angle that 4th lens and the 5th lens can make the outer chief ray of axle specify according to CMOS chip carries out deviation, ensure preferably while illuminance uniformity to be matched to image-position sensor, solve the aberration problems that the 3rd lens bring owing to adopting glass material.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the lens combination figure of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 2 A is the transfer curve figure of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 2 B is transfer curve figure under the limit resolution frequency of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 3 is the optics curvature of field and the distortion figure of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 4 is the point range figure of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 5 is the chromatic curve figure of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 6 is the relative luminance curve figure of a kind of embodiment of wide-angle lens proposed by the invention;
Fig. 7 is the transfer curve figure of a kind of embodiment under normal temperature (20 DEG C) of wide-angle lens proposed by the invention;
Fig. 8 is the transfer curve figure of a kind of embodiment under low temperature (-10 DEG C) of wide-angle lens proposed by the invention;
Fig. 9 is the transfer curve figure of a kind of embodiment under high temperature (50 DEG C) of wide-angle lens proposed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment one, a kind of wide-angle lens of the present embodiment, as shown in Figure 1, comprises from thing side successively to image side:
First lens 1, are plastic aspherical element eyeglass, have negative refractive power;
Second lens 2, for having the biconvex positive lens of plastic aspherical element eyeglass;
3rd lens 3, are glass spheric glass, have positive refracting power;
4th lens 4, are plastic aspherical element eyeglass, have negative refractive power;
5th lens 5 are plastic aspherical element eyeglass,
Described each power of lens meets f5 < f2 < f1 < f3 < f4, and wherein, f1, f2, f3, f4, f5 are respectively the focal power of the first lens 1 to the five lens 5.
The wide-angle lens of the present embodiment adopts 5 eyeglasses, wherein the 3rd lens 3 are glass spheric glass, other are plastic aspherical element eyeglass, 5 eyeglasses are according to the Rational Arrangement between each element, meet maximum 90 degree of field angle to disappear the requirement of distortion, and the quality of high/low temperature imaging is optimized and corrects.Its structure is simple, function admirable, and tolerance is good, manufactures simple, cheap.First lens 1 and the second lens 2 adopt the mode of negative lens and positive lens combination to collect high angle scattered light, the angle of the outer chief ray of axle and optical axis can be reduced, total system focal power range of distribution meets f5 < f2 < f1 < f3 < f4, f3 is only less than the focal power of f4, by designing the 3rd lens 3, there is larger focal power, glass material is adopted to correct thermal migration, effectively compensation temperature can offset the focal length variations produced, solve the thermal migration problem produced when camera lens is applied to the rugged surroundings such as high/low temperature, the span of the 3rd power of lens can be 0.25<f3<0.4, the positive and negative lens combination of the 3rd lens 3 and the 4th lens 4 is used for color difference eliminating, the micro lens incident angle that 4th lens 4 and the 5th lens 5 can make the outer chief ray of axle specify according to CMOS chip carries out deviation, ensure preferably while illuminance uniformity to be matched to image-position sensor, solve the aberration problems that the 3rd lens 3 bring owing to adopting glass material.
Described first lens 1 have the convex first surface to object space and upper and lower side is plane and the recessed second surface to image space of middle position, the first described lens 1, second lens 2 and the 4th lens 4, the 5th lens 5 are at least even aspheric surface, also be, for the first lens 1, at least second surface is aspheric surface, the refractive index n1 of described first lens 1 and dispersion range v1 meets: 1.5 < n1 < 1.6,50 < v1 < 60.1 structure of the first lens adopts negative lens to carry out high angle scattered light collection, can effective bending axis outer visual field chief ray, makes it diminish relative to the angle of optical axis, and then reduces the size of set of pieces afterwards.
The second described lens 2 are for having convex the 3rd surface to object space and upper and lower side is plane and middle position is convex surperficial to the 4th of image space, at least described 4th surface is aspheric surface, the refractive index n2 of described second lens 2 and dispersion range v2 meets: 1.5 < n2 < 1.6,50 < v2 < 60.The second described lens 2 adopt drum type lens, and its focal power is just, its effect is that the divergent rays that before making, group produces becomes parallel rays again through converging.
Fixed aperture (in figure, 1 is not shown) is provided with between described second lens 2 and the 3rd lens 3.The front arrangement of mirrors sheet of diaphragm comprises the first lens 1 and the second lens 2, rear arrangement of mirrors sheet comprises the 3rd lens 3 to the 5th lens 5, what rear group of lens set adopted is general optical collection system, wherein organize first (being also the 3rd lens 3) afterwards and there is larger focal power, glass material is adopted in order to correct thermal migration, effectively compensation temperature can offset the focal length variations produced, the effect of the 3rd lens 3 and the 4th lens 4 is positive and negative lens combinations, form a similar balsaming lens, can color difference eliminating, the micro lens incident angle that 4th lens 4 and the 5th lens 5 can make the outer chief ray of axle specify according to CMOS chip carries out deviation, ensure preferably while illuminance uniformity to be matched to image-position sensor.
Be aspheric surface for the two sides of the first lens 1, second lens 2 and the 4th lens 4, the 5th lens 5 below, and the first lens 1 adopt the plastic material of E48R model, and its refractive index and dispersion are respectively n1=1.53, v1=56.Second lens 2 adopt the plastic material of E48R model, and its refractive index and dispersion are respectively n2=1.53, v2=56.
In addition, described 3rd lens have convex the 5th surface to object space and convex the 6th surface to image space, and the 5th surface and the 6th surface are sphere, the refractive index n3 of described 3rd lens and dispersion range v3 meets: 1.5 < n3 < 1.7,40 < v3 < 60.In this preferred embodiment, adopt the glass material of H-BAK7 model, its refractive index and dispersion are respectively n3=1.57, v3=56.1.
Described 4th lens have recessed the 7th surface to object space and recessed the 8th surface to image space, the refractive index n4 of described 4th lens and dispersion range v4 meets: 1.6 < n4 < 1.7,20 < v4 < 30.In this preferred embodiment, adopt the plastic material of OKP4ht model, its refractive index and dispersion are respectively n4=1.63, v4=23.4.
Described 5th lens have convex the 9th surface to object space and convex the tenth surface to image space, the refractive index n5 of described 5th lens and dispersion range v5 meets: 1.5 < n5 < 1.7,50 < v5 < 60.In this preferred embodiment, adopt the plastic material of E48R model, its refractive index and dispersion are respectively n5=1.53, v5=56.
As shown in table 1, table 2, for the design parameter of the wide-angle lens of the present embodiment, show respectively sequentially numbered by object space optical surface number 1-10 (Surface), on optical axis on the curvature (C) of each optical surface, optical axis from the object side to the image side each with the distance (T) of a rear optical surface.Namely T represents the distance of the concave surface of the first lens 1 to the second lens 2 as shown in fig. 1, and even asphericity coefficient α 2, α 3, α 4, α 5, α 6, and wherein asphericity coefficient can meet following equation:
Wherein, z is the coordinate along optical axis direction, Y is the radial coordinate in units of length of lens unit, C is curvature (1/R), k is circular cone coefficient (Coin Constant), α i is the coefficient of each high-order term, and 2i is aspheric high power (the order of Aspherical Coefficient), and in the design, i=6 and quadratic term are up to 12 powers.
Table 1
| surface | α2 | α3 | α4 | α5 | α6 |
| 1 | -7.58E-04 | -4.89E-05 | 1.97E-06 | -9.26E-08 | 0.00E+00 |
| 2 | -6.57E-04 | -4.66E-04 | 1.93E-05 | -1.72E-05 | 0.00E+00 |
| 3 | -6.40E-03 | -1.84E-04 | -1.33E-04 | 2.58E-05 | 0.00E+00 |
| 4 | -8.73E-03 | 2.19E-03 | 5.55E-04 | -2.75E-06 | 0.00E+00 |
| 5 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 6 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 7 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 8 | 7.66E-03 | -1.78E-02 | 8.52E-04 | 2.73E-03 | -8.68E-04 |
| 9 | 6.61E-02 | -4.78E-02 | 1.49E-02 | -1.26E-03 | -9.42E-04 |
| 10 | -1.70E-02 | -4.04E-03 | 1.85E-04 | -1.04E-04 | 3.45E-05 |
| 11 | -2.21E-02 | -1.32E-03 | -4.06E-05 | 2.54E-05 | -6.76E-06 |
| 12 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 13 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 14 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 15 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 16 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
Table 2
Adopt the wide-angle lens of said structure, as shown in Figure 2, the MTF of the present embodiment wide-angle lens embodiment, MTF transfer curve figure (optical transfer function) can the image quality of concentrated expression system, its curve shape is more level and smooth, and X-axis height is higher relatively, the image quality of proof system is better.What Fig. 2 A schemed reflection is MTF curve under sensor limiting resolution, and 1/2 limit that what Fig. 2 B schemed reflection is differentiates MTF curve under frequency.In figure, shades of colour represents each field rays respectively, and from figure, two curves passed in letter curve map are comparatively smoothly compact, and the mtf value that Curves characterizes is very high, and the aberration of illustrative system obtains good correction.
As shown in Figure 3, for the curvature of field (FIELD CURVATURE) and distortion aberration (DISTORTION) curve map of this wide-angle lens, in curvature of field curve, right side graph is meridian direction, leftmost curve is for being Sagittal field curvature, the two does the astigmatism that difference is exactly system, astigmatism and the curvature of field are the important aberrations affecting the outer field rays of axle, astigmatism crosses the image quality of the serious system that the has influence on off-axis ray of conference, the curvature of field can cause center and peripheral optimal imaging not in one plane, and from figure, the curvature of field of system and astigmatism are all corrected within 30um.In figure, another curve is the distortion curve of system, distort the sharpness of not influential system, but the anamorphose of system can be caused, for wide-angle lens, correcting distorted is very difficult, the distortion of this wide-angle lens is less than 1%, and this illustrates that distortion has been remedied to an extraordinary degree.
As shown in Figure 4, for the point range figure of the present embodiment wide-angle lens, the disperse degree that each field rays of point range figure display system converges at image planes place and formed, so it characterizes system and obtains various difference characteristic, the image quality of the less proof system of RMS radius of point range figure is better.The disc of confusion RMS diameter of native system is all less than 1.5um, illustrates that aberration correction is very good.
As shown in Figure 5, the chromatic curve figure of this enforcement wide-angle lens, chromaticity difference diagram shows each wavelength and is all less than 1 pixel (3um) relative to reference wavelength color distortion, overall maximum wavelength color and minimum wavelength color difference are less than 3um, the sensor imaging being of a size of 3um at pixel is excellent, and in image, contour edge does not have color distortion.
As shown in Figure 6, be the relative luminance curve figure of this enforcement wide-angle lens, find out that the relative brightness value of the design is greater than 50% from figure, the relative brightness value of 50% makes system imaging excellent, image corner does not have significantly dark angle and occurs, general image uniform-illumination.
As shown in Figure 7, the MTF performance of this enforcement wide-angle lens under normal temperature (20 DEG C), as shown in Figure 8, the MTF performance of this enforcement wide-angle lens under low temperature (-10 DEG C), as shown in Figure 9, the MTF performance of this enforcement wide-angle lens under high temperature (50 DEG C), known from Fig. 7-Fig. 9, when 50 DEG C, MTF does not have deterioration clearly substantially, such performance can be described as and reaches the equal temperature characterisitic all adopting glass material, corrected again distortion aberration, advantage and the good effect of the wide-angle lens of the present embodiment are just this simultaneously.
As shown in Figure 1, described 5th is provided with optical filter 6 between lens and imaging side, described optical filter 6 is preferably cutoff filter, and adopting such optical filter effectively to filter out does not need to arrive the infrared light of imaging surface, and gained color of image effect is consistent with the same scene of eye-observation.The material of optical filter 6 is preferably BK7, and refractive index and dispersion are respectively n=1.5168, v=64.17.
In a word, the sensor chip in the wide-angle lens of the present embodiment can be OV9714 chip, and entirety reaches following technique effect: 1. coordinate OV9714 chip to achieve 85 degree of field angle, and distortion is controlled within 1%.2. aspheric surface adopts plastics, and sphere adopts glass, and shape is easy to processing.3. system overall length is less than 13mm.4. system transter reaches more than 0.4 at 166 lines to place.5. realize visible light wave range (430nm-650nm) blur-free imaging, without obvious thermal migration.6. system focal length 2.487mm/F#2.0, CMOS pixel dimension 3um, Diagonal Dimension 4.528mm, cutoff frequency 166lp/mm.
It should be noted that, in this embodiment, odd aspherical equation also can be adopted to design, and the general formula of odd aspherical equation is as follows:
Wherein, i=1,2,3,4 ... N.Equally also purpose of design can be reached.
Certainly; above-mentioned explanation is not limitation of the present invention; the present invention is also not limited in above-mentioned citing, the change that those skilled in the art make in essential scope of the present invention, remodeling, interpolation or replacement, also should belong to protection scope of the present invention.
Claims (9)
1. a wide-angle lens, is characterized in that, comprises successively from thing side to image side:
First lens, are plastic aspherical element eyeglass, have negative refractive power;
Second lens, for having the biconvex positive lens of plastic aspherical element eyeglass;
3rd lens, are glass spheric glass, have positive refracting power;
4th lens, are plastic aspherical element eyeglass, have negative refractive power;
5th lens are plastic aspherical element eyeglass,
Described each power of lens meets f5 < f2 <-f1 < f3 <-f4, and wherein, f1, f2, f3, f4, f5 are respectively the first lens to the 5th power of lens.
2. wide-angle lens according to claim 1, it is characterized in that, described first lens have the convex first surface to object space and the recessed second surface to image space, at least described second surface is aspheric surface, the refractive index n1 of described first lens and dispersion range v1 meets: 1.5 < n1 < 1.6,50 < v1 < 60.
3. wide-angle lens according to claim 2, it is characterized in that, the second described lens are have convex the 3rd surface to object space and convex the 4th surface to image space, at least described 4th surface is aspheric surface, the refractive index n2 of described second lens and dispersion range v2 meets: 1.5 < n2 < 1.6,50 < v2 < 60.
4. wide-angle lens according to claim 3, it is characterized in that, described 3rd lens have convex the 5th surface to object space and convex the 6th surface to image space, the refractive index n3 of described 3rd lens and dispersion range v3 meets: 1.5 < n3 < 1.7,40 < v3 < 60.
5. wide-angle lens according to claim 4, it is characterized in that, described 4th lens have recessed the 7th surface to object space and recessed the 8th surface to image space, at least described 8th surface is aspheric surface, the refractive index n4 of described 4th lens and dispersion range v4 meets: 1.6 < n4 < 1.7,20 < v4 < 30.
6. wide-angle lens according to claim 5, it is characterized in that, described 5th lens have convex the 9th surface to object space and convex the tenth surface to image space, at least described tenth surface is aspheric surface, the refractive index n5 of described 5th lens and dispersion range v5 meets: 1.5 < n5 < 1.7,50 < v5 < 60.
7. the wide-angle lens according to any one of claim 1-6, is characterized in that, is provided with fixed aperture between described second lens and the 3rd lens.
8. the wide-angle lens according to any one of claim 1-6, is characterized in that, the described 5th is provided with optical filter between lens and imaging side.
9. wide-angle lens according to claim 8, is characterized in that, described optical filter is cutoff filter.
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Application publication date: 20141224 |