CN106324812A - Lens assembly for shooting high-resolution pictures - Google Patents

Abstract

The invention relates to a lens assembly suitable for ultrahigh-resolution imaging. The lens assembly is composed of five imaging lenses and a filter (60); a first lens having a positive refractive index, a second lens (20) having a negative refractive index, a third lens (30) having a positive refractive index, a fourth crescent lens (40) having a negative refractive index, a fifth crescent lens (50) having a negative refractive index, and a filter (60) capable of filtering out infrared light are sequentially distributed from the object side to the image side; and the lens assembly satisfies the inequation that -3.0<f13/f35<-2.4, wherein f23 is the focal length of a lens formed by the first lens (10), the second lens (20) and the third lens (30), and f35 is the focal length of a lens formed by the third lens (30), the fourth lens (40) and the fifth lens (50). The lens assembly can improve the edge imaging ability, reduce various aberrations and improve MTF resolution, and therefore, the lens assembly can satisfy the imaging requirements of high-resolution imaging components.

Description

Shooting high-resolution pictures lens group

Technical field

The present invention relates to a kind of lens group, particularly relate to the camera lens that a kind of unmanned plane sensor obtains the high resolution picture of very-high solution, pass through mirror The optimization design of each lens parameter in head group, thus meet the imaging requirements of very-high solution photo.

Background technology

Prior art is difficult to realize bigger visual angle in narrow range for photographic head.And at present in the camera lens module of low latitude unmanned plane sensor Wide-angle lens to be used.Among these optics occur in and take photo by plane, because needing to realize observation imaging in the biggest scope, the most right Wide angular range has more preferable requirement.But current wide-angle lens group is difficult to meet above-mentioned Radix Rumicis requirement.One of them solution is to improve wide-angular field Angle, another solution is to improve the pixel quantity of image-forming component CCD or CMOS, utilizes high-altitude shooting to exchange higher visual angle for.By height Pixel image-forming component completes image acquisition.

Therefore the present invention is based on this class image-forming component CCD or the demand for development of CMOS front end photographic head, for existing lens group to high pixel Support ineffective shortcoming, the lens parameter in lens group is optimized and obtains the present invention.

Summary of the invention

A kind of shooting high-resolution pictures lens group, this lens group is made up of five imaging lens and optical filter 60.Wherein from thing direction to picture Direction respectively is first lens 10 with positive refracting power；Second lens 20 of negative index；There are the 3rd lens 30 of positive refracting power；Tool There are lunate 4th lens 40 of negative index；There are lunate 5th lens 50 of negative index；There is the optical filter G that can filter infrared light. Wherein this battery of lens meets following condition :-3.0 ＜ f₁₃/f₃₅＜-2.4.Wherein f₂₃Referring to the first lens 10, the second lens 20, the 3rd lens 30 form The focal length of lens.And f₃₅It is the 3rd lens 30 in lens group, the focal length of the lens of the 4th lens 40 and the combination of the 5th lens 50.

Especially, it is also possible to meet Nd₄This Nd of ＞ 2.1₄Refer to the coefficient of refraction of the 4th lens 40.

Especially, it is also possible to meet Nd₅＞ 1.5, this Nd₅Refer to the coefficient of refraction of the 5th lens 50.

Accompanying drawing explanation

Fig. 1 is the optical texture of the lens group of the 1st embodiment of the present invention.

Fig. 2 is the longitudinal spherical aberration of the 1st embodiment of the present invention, astigmatism, distortion schematic diagram.

Fig. 3 is the optical texture of the lens group of the 2nd embodiment of the present invention.

Fig. 4 is the longitudinal spherical aberration of the 2nd embodiment of the present invention, astigmatism, distortion schematic diagram.

Fig. 5 is the optical texture of the lens group of the 3rd embodiment of the present invention.

Fig. 6 is the longitudinal spherical aberration of the 3rd embodiment of the present invention, astigmatism, distortion schematic diagram.

Detailed description of the invention

Now with reference to accompanying drawing, exemplary enforcement is just described in detail.For the purpose of simplifying the description, identical or equivalent parts will have identical accompanying drawing Labelling, and will not be repeated again its explanation.

Detailed content for the present invention and technology explanation, existing be described further with embodiment, however, it should be noted that such embodiment only as a example by Show purposes of discussion, and should not be construed the restriction that the present invention is implemented.

The saturating head group of following embodiment can improve the imaging capability at edge, reduces various aberration, improves MTF resolution.Such that it is able to meet height Pixel image-forming component imaging needs.

First embodiment:

With reference to shown in Fig. 1-2, the optical structure chart of the lens group of the present invention, this lens group is made up of five imaging len 10-50 and optical filter 60. Wherein to respectively being first lens 10 with positive refracting power from thing direction to image space；Second lens 20 of negative index；There is positive refracting power The 3rd lens 30；There are lunate 4th lens 40 of negative index；There are lunate 5th lens 50 of negative index；Have and can filter Optical filter 60 except infrared light.Wherein this battery of lens meets following condition :-3.0 ＜ f₁₃/f₃₅＜-2.4.Wherein f₂₃Referring to the first lens 10, second is saturating Mirror 20, the focal length of the lens of the 3rd lens 30 composition.And f₃₅It is the 3rd lens 30 in lens group, the 4th lens 40 and 50 groups of the 5th lens The focal length of the lens closed.Especially, it is also possible to meet Nd₄＞ 2.1, this Nd₄Refer to the coefficient of refraction of the 4th lens 40.Especially, it is also possible to meet Nd₅＞ 1.5, this Nd₅Refer to the coefficient of refraction of the 5th lens 50.The design parameter of each lens can be found in table 1:

Surface	Radius of curvature (R)	Thickness interval (d)	Refractive index Nd	Abbe number Vd
					1	1.2104	0.6870	1.514600	57.17778
2	-3.981	0
					ST	∞	0.0810
4	16.7215	0.2500	1.80634	33.2676
					5	1.7508	0.2600
6	1.8091	0.2145	1.83	57.349
					7	∞	0.5502
8	-5.601	1.2502	2.290	28
					9	15.308	2.7604
10	-6.0219	0.0478	1.572	57.901
					11	1.4227	0.6091
12	∞	0.4000	1.71	69
					13	∞	0.5000

Table 1

In above-mentioned wide-angle lens group, aspheric spherical surface type meets following equation:

$z=\frac{c{h}^2}{1+{[1-(k+1)c^2{h}^2]}^{0.5}}+A{h}^4+B{h}^6+C{h}^8+D{h}^{10}+E{h}^{12}+F{h}^{14}+......$

Wherein z is the positional value making reference along optical axis direction in the position that height is h with surface vertices；K is tapering amount；C is the inverse of radius of curvature: A, B, C, D, E, F ... for order aspherical coefficients.

The concrete numerical value of the aspheric surface quadratic surface coefficient of the most each eyeglass is as follows:

Lens face	K	A	B	C	D	E	F
								1	-0.1068	0.061902	-0.40228	-0.0744	-0.01411	-0.04832	0
2	-82.184	0.336421	-0.24233	-0.02399	-0.32169	-0.43348	0
								4	2.24028	2.251092	20.27906	3.3006	10.98332	-0.09376	0
5	1.03729	-3.984	1.299532	0.110287	0	0.250126	-0.3018
								6	-5.141	9.042032	-0.09713	0.021423	0	4.300121	-5.9347
7	-2.232	-0.36928	-0.02497	-1.98689	-2.28272	0.0103	0
								8	-3.2801	-1.09683	-0.42769	0.03857	-4.39226	-0.02864	0
9	18.2828	-0.89682	-0.00401	0.008506	-0.04688	0	0
								10	-2.9020	0.013	-0.00401	-3.2645	-0.98128	-0.00724	0
11	-23.1902	4.12944	0.012684	0.38329	-0.03892	-0.99203	-0.0213

Table 2

Second embodiment:

Shown in reference Fig. 3-4, the optical structure chart of the wide-angle lens group of the present invention, the optical structure chart of the wide-angle lens group of the present invention, this wide-angle lens Head group is made up of five imaging len 10-50 and optical filter 60.Wherein from thing direction to image space, there is the first saturating of positive refracting power to respectively being Mirror 10；Second lens 20 of negative index；There are the 3rd lens 30 of positive refracting power；There are lunate 4th lens 40 of negative index；Tool There are lunate 5th lens 50 of negative index；There is the optical filter 60 that can filter infrared light.Wherein this battery of lens meets following condition: -3.0 ＜ f₁₃/f₃₅＜-2.4.Wherein f₂₃Refer to the first lens 10, the second lens 20, the focal length of the lens of the 3rd lens 30 composition.And f₃₅It it is camera lens 3rd lens 30 in group, the focal length of the lens of the 4th lens 40 and the combination of the 5th lens 50.Especially, it is also possible to meet Nd₄＞ 2.1, this Nd₄ Refer to the coefficient of refraction of the 4th lens 40.Especially, it is also possible to meet Nd₅＞ 1.5, this Nd₅Refer to the coefficient of refraction of the 5th lens 505.Each The design parameter of mirror can be found in table 3:

Surface	Radius of curvature (R)	Thickness interval (d)	Refractive index Nd	Abbe number Vd
					1	1.20103	0.6870	1.514600	57.17778
2	-3.981	0
					ST	∞	0.0810
4	16.7215	0.2505	1.80634	33.2676
					5	1.5028	0.2700
6	1.8911	0.2038	1.81	57.104
					7	16.404	0.5588
8	-5.694	1.2519	2.290	28.6
					9	15.308	2.7604
10	-6.0219	0.0478	1.592	57.884
					11	1.4227	0.6091

12	∞	0.4000	1.71	69.3
					13	∞	0.5000

Table 3

The concrete numerical value of the aspheric surface quadratic surface coefficient of the most each eyeglass is as follows:

Lens face	K	A	B	C	D	E	F
								1	-0.10386	0.064842	-0.39934	-0.07146	-0.01117	-0.04538	0
2	-82.1811	0.339361	-0.23939	-0.02105	-0.31875	-0.43054	0
								4	2.24322	2.254032	20.282	3.30354	10.98626	-0.09082	0
5	1.04023	-3.98106	1.302472	0.113227	0	0.253066	-0.4831
								6	-5.13806	9.044972	-0.09419	0.024363	0	4.303061	-5.1303
7	-2.22906	-0.36634	-0.02203	-1.98395	-2.27978	0.01324	0
								8	-3.27716	-1.09389	-0.42475	0.04151	-4.38932	-0.0257	0
9	18.28574	-0.89388	-0.00107	0.011446	-0.04394	0.00294	0
								10	-2.89906	0.01594	-0.00107	-3.26156	-0.97834	-0.0043	0
11	-23.1873	4.13238	0.015624	0.38623	-0.03598	-0.98909	0

Table 4

3rd embodiment:

With reference to shown in Fig. 5-6, the optical structure chart of the lens group of the present invention, this lens group is made up of five imaging len 10-50 and optical filter 60. Wherein to respectively being first lens 10 with positive refracting power from thing direction to image space；Second lens 20 of negative index；There is positive refracting power The 3rd lens 30；There are lunate 4th lens 40 of negative index；There are lunate 5th lens 50 of negative index；Have and can filter Optical filter 60 except infrared light.Wherein this battery of lens meets following condition :-3.0 ＜ f₁₃/f₃₅＜-2.4.Wherein f₂₃Referring to the first lens 10, second is saturating Mirror 20, the focal length of the lens of the 3rd lens 30 composition.And f₃₅It is the 3rd lens 30 in lens group, the 4th lens 40 and 50 groups of the 5th lens The focal length of the lens closed.Especially, it is also possible to meet Nd₄＞ 2.1, this Nd₄Refer to the coefficient of refraction of the 4th lens 40.Especially, it is also possible to meet Nd₅＞ 1.5, this Nd₅Refer to the coefficient of refraction of the 5th lens 50.The design parameter of each lens can be found in table 5:

Surface	Radius of curvature (R)	Thickness interval (d)	Refractive index Nd	Abbe number Vd
					1	1.26088	0.4390	1.55900	58.4378
2	-3.301	0
					ST	∞	0.0810
4	16.9105	0.3570	1.80634	33.2676
					5	1.5534	0.2900
6	1.9130	0.2458	1.81	57.244
					7	14.602	0.3550
8	-5.107	1.6890	2.250	30.4
					9	15.295	2.231

10	-6.0219	0.0478	1.623	58.740
					11	1.4227	0.6091
12	∞	0.4000	1.63	62.17
					13	∞	0.5000

Table 5

The concrete numerical value of the aspheric surface quadratic surface coefficient of the most each eyeglass is as follows:

Lens face	K	A	B	C	D	E	F
								1	-0.10196	0.060542	-0.40364	-0.07576	-0.01547	0.174639	0
2	-82.1792	0.335061	-0.24369	-0.02535	-0.32305	-0.21052	0
								4	2.24512	2.249732	20.2777	3.29924	10.98196	0.129199	0
5	1.04213	-3.98536	1.298172	0.108927	0	0.473085	-0.61903
								6	-5.13616	9.040672	-0.09849	0.020063	0	4.52308	-4.28693
7	-2.22716	-0.37064	-0.02633	-1.98825	-2.28408	0.233259	0
								8	-3.27526	-1.09819	-0.42905	0.03721	-4.39362	0.194319	0
9	18.28764	-0.89818	-0.00537	0.007146	-0.04824	0.222959	0
								10	-2.89716	0.01164	-0.00537	-3.26586	-0.98264	0.215719	0
11	-23.3973	4.4438	0.0384	0.38710	-0.0488	-1.1290	0

Table 6

Claims (3)

1. a shooting high-resolution pictures lens group, this lens group is made up of, wherein from thing direction to image space five imaging lens and optical filter (60) To respectively being first lens (10) with positive refracting power；Second lens (20) of negative index；There are the 3rd lens (30) of positive refracting power；Tool There are lunate 4th lens (40) of negative index；There are lunate 5th lens (50) of negative index；There is the optical filter that can filter infrared light (60), wherein this lens group meets following condition :-3.0 ＜ f₁₃/f₃₅＜-2.4.Wherein f₂₃Refer to the first lens (10), the second lens (20), the 3rd The focal length of the lens that lens (30) form, and f₃₅It is the 3rd lens (30) in lens group, the 4th lens (40) and the 5th lens (50) group The focal length of the lens closed.

2. lens group as claimed in claim 1, also meets Nd₄＞ 2.1, this Nd₄Refer to the coefficient of refraction of the 4th lens (40).

3. lens group as claimed in claim 1, also meets Nd₅＞ 1.5, this Nd₅Refer to the coefficient of refraction of the 5th lens (50).