CN103969797B - A kind of preposition wide-angle lens of aspheric surface high definition - Google Patents
A kind of preposition wide-angle lens of aspheric surface high definition Download PDFInfo
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- CN103969797B CN103969797B CN201310565430.3A CN201310565430A CN103969797B CN 103969797 B CN103969797 B CN 103969797B CN 201310565430 A CN201310565430 A CN 201310565430A CN 103969797 B CN103969797 B CN 103969797B
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Abstract
The present invention relates to field of optical device technology, particularly relate to a kind of preposition wide-angle lens of aspheric surface high definition for mobile phone 2,000,000 pixel camera head module, adopt that diaphragm is preposition and the structure of three aspheric surface plastic lens, by special aspheric surface unitized design, there is modular volume less, the bigger product good article rate height of field angle, imaging effect is good, the advantage that cost is lower.
Description
Technical field
The present invention relates to field of optical device technology, particularly relate to a kind of preposition wide-angle lens of aspheric surface high definition for mobile phone 2,000,000 pixel camera head module.
Background technology
After 2013 start, from smart mobile phone treater to display screen, again to camera, even to each related accessory of mobile phone, all present the competition situation of at a high speed upgrading. Owing to the flagship mobile phone configuration of each brand current is all similar, therefore finding product differentiationization just becomes a thing racked one's brains. And in some nearest mobile phone new products, we seem to find that manufacturer particularly payes attention to for mobile phone front-facing camera.
At the initial stage that front-facing camera is born, its pixel is also level as 100,000,300,000, and out the image quality of photo is really so tragic that one cannot bear to look at it. Especially when night autodynes, be not fuzzy it is exactly make an uproar a little, adding the not convenience using rearmounted camera to autodyne, a race of autodyning is more and more higher to the front-facing camera mobile phone cry of high pixel so that front-facing camera has become the important parameter that users purchase machine. In order to meet consumers' demand, striving for more iron users, the mobile phone configuring high pixel front-facing camera becomes more and more urgent. Therefore, first many mobile phone brand factories in 2012 in succession will under the preposition VGA camera lens of intelligent mobile phone be replaced by HD high image quality camera lens (resolving power specification be 1,280x720), 4th season in 2012 causes apple (Apple) iPhone5 of upsurge of panic buying in the whole world, and its preposition camera lens is also the high image quality camera lens adopting the video recording that can accomplish 720pHD. Visible, have the preposition of high-quality and rearmounted camera lens has become development and the fashion trend of mobile phone simultaneously.
Existing preposition camera lens technology, how to meet lens assembly under high-and low-temperature resistance environment while high quality imaging effect, also possesses good processing and manufacturing ability, go forward side by side the production cost of a step-down low lens assembly, with applicable produce in enormous quantities to wait all become the satisfied requirement of optical lens assembly design needs. But, it is relatively big still to there is pixel cell in existing preposition 2M product, and modular volume is relatively big, and field angle is less, and product good article rate is low, and imaging effect is poor, the shortcoming that cost is higher.
Summary of the invention
It is an object of the invention to provide a kind of preposition wide-angle lens of aspheric surface high definition for the deficiencies in the prior art, have modular volume less, the bigger product good article rate height of field angle, imaging effect is good, the advantage that cost is lower.
For achieving the above object, the present invention is achieved through the following technical solutions.
A kind of preposition wide-angle lens of aspheric surface high definition, it comprises from object side to the diaphragm, lenses one, lenses two, lenses three and the glass filter that become image side to be arranged in order, and it adopts diaphragm preposition, and diaphragm is positioned at sequence side, the face end of lenses one; Described lenses one, lenses two and lenses three are aspheric surface plastic lens, and the two sides of eyeglass is even aspheric surface; The aspheric surface formula of described lenses one, lenses two and lenses three is:
Wherein, z represents the Z coordinate value of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is the inverse of the radius of curvature R of lens surface, and k is circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For high-order asphericity coefficient;
Wherein, the center of lens thickness TC of described lenses one is 0.29 ~ 0.33mm, and the center of lens thickness TC of lenses two is 0.507 ~ 0.527mm, and the center of lens thickness TC of lenses three is 0.26 ~ 0.29mm.
Preferably, the center of lens thickness TC of described lenses one, and the clearance thickness A C between lenses one and lenses two, its ratio TC/AC=0.7 ~ 1.0.
Preferably, the center of lens thickness TC of described lenses three, and the clearance thickness A C between lenses two and lenses three, its ratio TC/AC=2 ~ 3.
Preferably, effective focal distance f 1 of described lenses one, and effective focal distance f of whole lens assembly, its ratio f1/f=1.5 ~ 1.6.
Preferably, the radius of curvature R 2 of the face sequence two of described lenses one, and the radius of curvature R 1 of face sequence one, its ratio R 2/R1=5.0 ~ 5.2.
Preferably, the material of described lenses one and lenses two is ZEONEX series, and lenses three selects higher compared to the specific refractory power of ZEONEX series and that dispersion is lower material.
The useful effect of the present invention is: a kind of preposition wide-angle lens of aspheric surface high definition of the present invention, adopt that diaphragm is preposition and the structure of three aspheric surface plastic lens, by special aspheric surface unitized design, there is modular volume less, the bigger product good article rate height of field angle, imaging effect is good, the advantage that cost is lower.
Accompanying drawing explanation
Accompanying drawing is utilized the present invention to be further detailed below, but the embodiment in accompanying drawing does not form any limitation of the invention.
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the light imaging schematic diagram of the present invention.
Fig. 3 is the MTF schematic diagram of the present invention.
Fig. 4 is the curvature of field, the distortion schematic diagram of the present invention.
Fig. 5 is the disperse spot schematic diagram of the present invention.
Fig. 6 is the relative exposure schematic diagram of the present invention.
Embodiment
Below in conjunction with concrete enforcement mode, the present invention will be described.
As shown in Figures 1 to 6, a kind of preposition wide-angle lens of aspheric surface high definition, it comprises from object side to the diaphragm 6, lenses 1, lenses 22, lenses 33 and the glass filter 4 that become image side 5 to be arranged in order, it adopts diaphragm 6 preposition, and diaphragm 6 is positioned at the face sequence 1 side end of lenses 1; Described lenses 1, lenses 22 and lenses 33 are aspheric surface plastic lens, and the two sides of eyeglass is even aspheric surface. Said lens system is when carrying out work, and the light come from object space forms image at imaging plane successively after lenses 1, lenses 22, lenses 33 and glass filter 4.
As shown in Figure 1 with, shown in Fig. 2, in the present embodiment, described lenses 1 is meniscus, and convex surface facing object space, concave surface is towards image space; Described lenses 22 is meniscus, and concave surface is towards object space, convex surface facing image space; Described lenses 33 is meniscus, and convex surface facing object space, concave surface is towards image space, further, and the face sequence 5 30 of lenses 33 presents waviness. The present invention adopts the structure of three aspheric surface plastic lens, the feature of this kind of non-spherical lens is, from lens centre to periphery curvature be consecutive variations, different from there being the spherical lens of certain curvature from lens centre to periphery, non-spherical lens has better radius-of-curvature characteristic, there is the advantage improved and distort aberration and improve astigmatism aberration, the visual field can be made to become true more greatly, therefore, after adopting non-spherical lens, the aberration occurred when imaging can be eliminated as much as possible, thus improve image quality.
In the present embodiment, the aspheric surface formula of described lenses 1, lenses 22 and lenses 33 is:
Wherein, z represents the Z coordinate value of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is the inverse of the radius of curvature R of lens surface, and k is circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For high-order asphericity coefficient. As preferred embodiment, the front surface of described lenses 1, lenses 22 and lenses 33 and the face shape parameter of rear surface are as follows respectively, and unit is mm:
Lenses one 1 sequences, one 10 sequences 2 11
c1/1.123010500610811/5.77933603671751
k-0.534835551381120.82927974187
α100
α2-0.059276211838870.3625019330408
α31.037157243344-6.376752018275
α421.0824773115985.37058307542
α5-346.5059508312-569.3162839368
α61429.3683510382233.195739647
α71651.537876616-3504.578134213
α8-14256.63877551-1003.307410193
Lenses 22 sequences, 3 20 sequences 4 21
c1/-1.119715667699091/-0.540218348069324
k2.618694236349-0.4237153056021
α100
α2-0.57797418408010.2423788206846
α36.106744634073-0.05599079433399
α4-79.165817470223.68164289308
α5452.9374450042-11.96783158718
α6-956.91003149041.564507520046
α7715.093300921884.8512827075
α8121.7427830292-61.78249555517
Lenses 33 sequences, 5 30 sequences 6 31
c1/1.244443256955321/0.586891577503744
k-19.02281018649-4.01786443781
α100
α2-0.7447450251194-0.9074055142427
α3-0.035317320942211.683625023203
α44.548569708746-1.903643771291
α5-9.8258345253650.8728470618774
α64.9437390680560.2955735152371
α76.835902349721-0.4531104535668
α8-6.8957352676780.1158429510333
Wherein, it is preferable that, the material of described lenses 1 and lenses 22 is ZEONEX series, such as ZEONEX-E48R etc. Described lenses 33 selects higher compared to the specific refractory power of ZEONEX series and that dispersion is lower material, such as Polycarb or OKP4 series, the optics effective diameter of lenses 33 can be effectively reduced, make its optics effective diameter be less than 2.5mm, thus be conducive to whole lens assembly contour structures to realize subminiaturization.
In the present embodiment, in order to reach distortion and the key light line shooting angle of reduction system better, improve the imaging effect of whole group of camera lens, need described lenses 1, lenses 22 and lenses 33 specifically to be designed, specific as follows: one, preferred, the center of lens thickness TC of described lenses 1 is 0.29 ~ 0.33mm, the center of lens thickness TC of lenses 22 is 0.507 ~ 0.527mm, the center of lens thickness TC of lenses 33 is 0.26 ~ 0.29mm, can effectively shorten lens optical overall length much smaller than 2.8mm. Two, preferred, the center of lens thickness TC of described lenses 1, and the clearance thickness A C between lenses 1 and lenses 22, its ratio TC/AC=0.7 ~ 1.0, can be conducive to the TV distortion value controlling lens group within the scope of specification value. Three, preferred, the center of lens thickness TC of described lenses 33, and the clearance thickness A C between lenses 22 and lenses 33, its ratio TC/AC=2 ~ 3, contribute to regulating the centrality in MTF curve S/T direction, be more conducive to management and control camera lens overall as matter. Four, preferred, effective focal distance f 1 of described lenses 1, and effective focal distance f of whole lens assembly, its ratio f1/f=1.5 ~ 1.6, effective focal distance f of control lens assembly, ensures that the field angle of lens assembly is greater than 80 °.Five, preferred, the radius of curvature R 2 of the face sequence 2 11 of described lenses 1, and the radius of curvature R 1 of face sequence 1, its ratio R 2/R1=5.0 ~ 5.2, the deviation of adjusting mirror sheet material specific refractory power actual value and theoretical value, and effectively reduce the impact of moulding process.
From accompanying drawing 1 ~ 6 and the mode of enforcement, it can be seen that a kind of preposition wide-angle lens of aspheric surface high definition of the present invention has following feature:
1, adopt diaphragm 6 preposition, improve central vision image quality while ensureing systematic eccentricity tilt sensitive degree, reach the high definition image quality of 2,000,000 pixels.
2, using the resin material of general high-refractivity and low-dispersion on the market to replace glass, forming technique is stable and technical maturity, the problem that production efficiency is low and cost is higher solving the processing difficulties of glass mirror and cause; Each face type of eyeglass is the setting of aspheric surface simultaneously, can effectively eliminate all kinds of aberration, obtain good imaging effect.
3, within camera lens overall length foreshortens to 2.8mm, the optics effective diameter of eyeglass three is less than 2.5mm, thus is conducive to the Superminiature structure that whole lens assembly realizes within the scope of M4-M5; Field angle reaches 80 degree, big picture, caters to mobile lens recent development trend, meets the needs of the current preposition wide-angle lens of mobile phone market high definition.
4, camera lens from central vision to the disperse spot size of 0.8 visual field all within the twice numerical range of the 1/6.5 inch gage single pixel granular size of image sensor COMS chip, the chief ray angle of the outer visual field of axle is less than 29 °, meet image sensor CMOS chip to the requirement of light receptivity scope, make it to there is the sharp keen degree height of imaging, color clearly, the features such as color reducibility is good.
Above content is only the better embodiment of the present invention, for the those of ordinary skill of this area, according to the thought of the present invention, all will change in specific embodiments and applications, and this description should not be construed as limitation of the present invention.
Claims (1)
1. the preposition wide-angle lens of aspheric surface high definition, it is characterized in that: it comprises from object side to the diaphragm (6) becoming image side (5) to be arranged in order, lenses one (1), lenses two (2), lenses three (3) and glass filter (4), it adopts diaphragm (6) preposition, and diaphragm (6) is positioned at face sequence one (10) the side end of lenses one (1); Described lenses one (1), lenses two (2) and lenses three (3) are aspheric surface plastic lens, and the two sides of eyeglass is even aspheric surface; The aspheric surface formula of described lenses one (1), lenses two (2) and lenses three (3) is:
Wherein, z represents the Z coordinate value of lens surface each point, and r represents the Y-axis coordinate figure of each point on lens surface, and c is the inverse of the radius of curvature R of lens surface, and k is circular cone coefficient, α1、α2、α3、α4、α5、α6、α7、α8For high-order asphericity coefficient;
Wherein, the center of lens thickness TC of described lenses one (1) is 0.29 ~ 0.33mm, and the center of lens thickness TC of lenses two (2) is 0.507 ~ 0.527mm, and the center of lens thickness TC of lenses three (3) is 0.26 ~ 0.29mm;
The center of lens thickness TC of described lenses one (1), and the clearance thickness A C between lenses one (1) and lenses two (2), its ratio TC/AC=0.7 ~ 1.0;
The center of lens thickness TC of described lenses three (3), and the clearance thickness A C between lenses two (2) and lenses three (3), its ratio TC/AC=2 ~ 3;
Effective focal distance f 1 of described lenses one (1), and effective focal distance f of whole lens assembly, its ratio f1/f=1.5 ~ 1.6; The radius of curvature R 2 of the face sequence two (11) of described lenses one (1), and the radius of curvature R 1 of face sequence one (10), its ratio R 2/R1=5.0 ~ 5.2;
The material of described lenses one (1) and lenses two (2) is ZEONEX series, and lenses three (3) selects higher compared to the specific refractory power of ZEONEX series and that dispersion is lower material;
Within its camera lens overall length foreshortens to 2.8mm, the optics effective diameter of lenses three (3) is less than 2.5mm; Field angle reaches 80 degree; Camera lens is from central vision to the disperse spot size of 0.8 visual field all within the twice numerical range of the 1/6.5 inch gage single pixel granular size of image sensor COMS chip, and the chief ray angle of the outer visual field of axle is less than 29 °.
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| CN201310565430.3A CN103969797B (en) | 2013-11-13 | 2013-11-13 | A kind of preposition wide-angle lens of aspheric surface high definition |
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| CN104166221B (en) * | 2014-08-29 | 2017-02-08 | 广东旭业光电科技股份有限公司 | Optical lens assembly |
| CN109196519B (en) * | 2018-08-21 | 2020-11-17 | 深圳市汇顶科技股份有限公司 | Lens system, fingerprint identification device and terminal equipment |
Citations (4)
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| CN1828355A (en) * | 2005-03-01 | 2006-09-06 | 柯尼卡美能达精密光学株式会社 | Taking lens system |
| CN1982933A (en) * | 2005-12-16 | 2007-06-20 | 里程碑株式会社 | Imaging lens |
| TWM462376U (en) * | 2013-05-10 | 2013-09-21 | Ability Opto Electronics Technology Co Ltd | Three sheets type imaging mirror head module |
| CN203616523U (en) * | 2013-11-13 | 2014-05-28 | 东莞市旭业光电科技有限公司 | Aspheric high-definition front wide angle lens |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI410670B (en) * | 2010-02-09 | 2013-10-01 | Largan Precision Co Ltd | Imaging lens system |
| US8493671B2 (en) * | 2011-12-26 | 2013-07-23 | Newmax Technology Co., Ltd. | Three-piece optical lens system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1828355A (en) * | 2005-03-01 | 2006-09-06 | 柯尼卡美能达精密光学株式会社 | Taking lens system |
| CN1982933A (en) * | 2005-12-16 | 2007-06-20 | 里程碑株式会社 | Imaging lens |
| TWM462376U (en) * | 2013-05-10 | 2013-09-21 | Ability Opto Electronics Technology Co Ltd | Three sheets type imaging mirror head module |
| CN203616523U (en) * | 2013-11-13 | 2014-05-28 | 东莞市旭业光电科技有限公司 | Aspheric high-definition front wide angle lens |
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Address after: 523000 Guangdong province Dongguan City Shipai town of Fulong Industrial Zone Second Road two Applicant after: Guangdong Xu Ye Optoelectronics Technology incorporated company Address before: 523000 Guangdong Province, Dongguan City Shipai Town Industrial Zone seven second Fulong road Dongguan xuye Photoelectric Technology Co. Ltd. Applicant before: Dongguan Xuye Photoelectric Technology Co.,Ltd. |
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Free format text: CORRECT: APPLICANT; FROM: DONGGUAN XUYE OPTOELECTRONIC TECHNOLOGY CO., LTD. TO: GUANGDONG XUYE OPTOELECTRONICS TECHNOLOGY CO., LTD. |
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