CN105403982A - High-image-quality optical imaging lens for unmanned plane aerial photography - Google Patents

High-image-quality optical imaging lens for unmanned plane aerial photography Download PDF

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Publication number
CN105403982A
CN105403982A CN201511017349.7A CN201511017349A CN105403982A CN 105403982 A CN105403982 A CN 105403982A CN 201511017349 A CN201511017349 A CN 201511017349A CN 105403982 A CN105403982 A CN 105403982A
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China
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lens
spacing
unmanned plane
optical imaging
picture element
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CN201511017349.7A
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CN105403982B (en
Inventor
瞿勇
甘汝婷
江依达
肖明志
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Union Optech Co Ltd
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Union Optech Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/001Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/06Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00Optical objectives specially designed for the purposes specified below
    • G02B13/18Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

Abstract

The invention discloses a high-image-quality optical imaging lens for unmanned plane aerial photography. The imaging lens includes a front lens set and a rear lens set, an aperture diaphragm is arranged between the front lens set and the rear lens set, both of the front lens set and the rear lens set are non-spherical lenses, and through the optimization of the parameters of the lenses in each of the front lens set and the rear lens set, the imaging lens has the characteristics of high image quality, large view field, high resolution, less distortion, small size, large shooting frame, clear obtained image, and low cost, and can be applied to an unmanned plane aerial photography optical imaging system.

Description

A kind of high picture element is used for unmanned plane and takes photo by plane optical imaging lens
[technical field]
The present invention relates to optical imaging lens, particularly relate to a kind of high picture element and to take photo by plane optical imaging lens for unmanned plane.
[background technology]
Existing unmanned plane is taken photo by plane by shortcomings such as the most volume of optical imaging system are large, visual field is little, resolution is low, picture element is poor, obtaining information amount is few.As the Chinese patent that the patent No. is 201020555002.4 and 201210229615.2, it discloses a kind of camera lens, the overall length of camera lens is longer, and volume is comparatively large, causes cost when being arranged on unmanned plane higher, and shooting picture is little, and picture element is poor.
Namely the present invention researchs and proposes for the deficiencies in the prior art.
[summary of the invention]
Instant invention overcomes the deficiencies in the prior art, provide a kind of high picture element to take photo by plane optical imaging lens for unmanned plane, comprise front lens group and rear lens group, aperture diaphragm is provided with between front lens group and rear lens group, one piece of non-spherical lens is all adopted in front lens group and rear lens group, by optimizing the parameter of each lens in each front lens group and rear lens group, making it camera lens of the present invention, to have picture element high, visual field is large, resolution is high, distort little, volume is little, shooting picture is large, obtain clear picture and the low feature of cost, can be used for unmanned plane to take photo by plane optical imaging system.
In order to solve the problems of the technologies described above, a kind of high picture element of the present invention is used for unmanned plane and takes photo by plane optical imaging lens, comprises front lens group, aperture diaphragm, rear lens group, optical filter and image acquisition element successively from the object side to image side.
Described front lens group comprises the first lens, the second lens, the 3rd lens and the 4th lens that set gradually from the object side to image side, described first lens are glass aspheric lenses, described second lens, the 3rd lens and the 4th lens are glass spherical lens, in described front lens group, each lens are convex surface towards thing side one side, and each lens are concave surface towards image side one side, described first lens and the second power of lens are negative value, described 3rd lens and described 4th power of lens be on the occasion of;
Described rear lens group comprises the 5th lens set gradually from the object side to image side, 6th lens, 7th lens and the 8th lens, described 5th lens, 6th lens and the 7th lens are glass spherical lens, described 8th lens are aspherical glass lens, described 5th lens, the two sides of the 7th lens and the 8th lens is convex surface, described 6th lens are concave surface towards the one side of thing side, and described 6th lens are convex surface towards the one side of image side, described 5th lens and the 6th lens combination are balsaming lens, described 5th lens, 7th lens and the 8th power of lens be on the occasion of, described 6th power of lens is negative value,
The focal length of described first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens is respectively f1, f2, f3, f4, f5, f6, f7 and f8, meets:
1<f2/f1<2.5,
4<f3/f4<6,
-12<f5/f6<-9,
1<f7/f8<2。
The abbe number of described first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens is respectively vdlens1, vdlens2, vdlens3, vdlens4, vdlens5, vdlens6, vdlens7 and vdlens8, meets:
45<(vdlens1,vdlens8)<55,
vdlens2>80,
vdlens6<30,
37<(vdlens3,vdlens4,vdlens7)<45。
Convex surface and the concave surface of described first lens are hyperbolic-type aspheric surface.
Described 5th lens and the 6th lens are made up of refractive index and the large domestic glass material of Abbe number difference.
Described 8th lens are oval aspheric surface towards the convex surface of thing side, and described 8th lens are oblate aspheric surface towards the convex surface of image side.
The spacing of described first lens and the second lens is A1, the spacing of described second lens and the 3rd lens is A2, the spacing of described 3rd lens and the 4th lens is A3, the spacing of described 4th lens and aperture diaphragm is A4, the spacing of described aperture diaphragm and the 5th lens is A5, the spacing of described 6th lens and the 7th lens is A6, the spacing of described 7th lens and the 8th lens is A7, the spacing of described 8th lens and optical filter is A8, the spacing of described first lens and optical filter is TL, total focal length of described camera lens is f, meets:
A1/TL<0.2,
0.1<A1+A2+A3/TL<0.2,5<A4/A5<6,
0.08<A6+A7+A8/TL<0.12
0.1<f/TL<0.2。
Described first lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens center thickness are respectively T1, T2, T3, T4, T5, T6, T7 and T8, meet:
2<T5/T6<2.5,
0.2<T1+T2+T3+T4/TL<0.3,
0.25<T5+T6+T7+T8/TL<0.35。
Compared with prior art, a kind of high picture element of the present invention is used for unmanned plane and takes photo by plane optical imaging lens, has following advantage:
1, camera lens of the present invention adopts technique scheme, the total focal length of camera lens is 3.97mm, field angle is 90 °, make the optical transfer function of camera lens comparatively large, when 60lp/mm, the MTF>0.73 of full filed, and the MTF curve of whole visual field is more concentrated, therefore, whole visual field all has higher resolution, and overall picture element is better.
2, camera lens of the present invention adopts technique scheme, and illumination image planes are evenly overall, and relative exposure is greater than 0.8, brightness is high, f-number can reach F2.8.
3, camera lens of the present invention adopts technique scheme, can realize the maximum wide-angle imaging to 90 °.
4, in order to aberration correction, ensure high-resolution imaging, rear lens group have employed a balsaming lens, and namely the 5th lens are bonding with the 6th lens is balsaming lens, makes the aberration of whole camera lens all smaller.
5, in camera lens of the present invention, the first lens and the 8th lens are non-spherical lens, are conducive to the correction of aberration, reduce the distortion of system, improve the resolution of camera lens, make field of view center and edge all have good resolution.
6, camera lens of the present invention adopts technique scheme, and combined by reasonable disposition, be difficult to the difficult problem realizing high resolving power and low distortion under solving Large visual angle, camera lens of the present invention distorts when maximum field of view and is only 0.92%; Meanwhile, lens construction of the present invention has the feature of miniaturization and weight lightness.
[accompanying drawing explanation]
Fig. 1 is the structural representation of each lens layout of camera lens of the present invention.
Fig. 2 is the transfer curve figure of the embodiment of the present invention.
Fig. 3 is the curvature of field curve map of the embodiment of the present invention.
Fig. 4 is the distortion curve figure of the embodiment of the present invention.
Fig. 5 is the spherical aberration curve map of the embodiment of the present invention.
[embodiment]
Describe the present invention below in conjunction with accompanying drawing:
As shown in Figure 1, a kind of high picture element of the present invention is used for unmanned plane and takes photo by plane optical imaging lens, comprises front lens group 1, aperture diaphragm 2, rear lens group 3, optical filter 4 and image acquisition element 5 from the object side to image side successively.Aperture diaphragm 2 is positioned at the middle part of camera lens, for controlling the aperture of light transmission, such that imaging picture is overall evenly, brightness is high.Rear lens group 3 is made up of four pieces of lens, is mainly used in reducing imaging aberration, promotes picture element; Optical filter 4 described in the embodiment of the present invention adopts IR optical filter; image acquisition element 5 is CMOS sensitive chip; when light enters into image acquisition element 5 from optical filter 4; optical filter 4 pairs of image acquisition element 5 have certain protective effect; simultaneously also filter a part of spurious rays, make that image picture element is clear, color is beautiful and sharp keen while there is good color reducibility.
Described front lens group 1 comprises the first lens 11 set gradually from the object side to image side, second lens 12, 3rd lens 13 and the 4th lens 14, described first lens 11 are glass aspheric lenses, described second lens 12, 3rd lens 13 and the 4th lens 14 are glass spherical lens, in described front lens group 1, each lens are convex surface towards thing side one side, and each lens are concave surface towards image side one side, for controlling and reducing the change in refraction angle of light in front lens group 1 between each lens, control imaging aberration and reduce structural tolerance sensitivities, the focal power of described first lens 11 and the second lens 12 is negative value, the focal power of described 3rd lens 13 and described 4th lens 14 be on the occasion of.
Described rear lens group 3 comprises the 5th lens 35 set gradually from the object side to image side, 6th lens 36, 7th lens 37 and the 8th lens 38, described 5th lens 35, 6th lens 36 and the 7th lens 37 are glass spherical lens, described 8th lens 38 are aspherical glass lens, described 5th lens 35, the two sides of the 7th lens 37 and the 8th lens 38 is convex surface, described 6th lens 36 are concave surface towards the one side of thing side, and described 6th lens 36 are convex surface towards the one side of image side, described 5th lens 35 and the 6th lens 36 are combined as balsaming lens, described 5th lens 35, 7th lens 37 and the 8th power of lens be on the occasion of, the focal power of described 6th lens 36 is negative value.
The two sides of described 7th lens 37 is convex surface, and focal power be on the occasion of, be mainly used in reducing the chief ray incidence angles of light in image planes, and reduce imaging aberration.
The focal length of described first lens 11, second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36, the 7th lens 37 and the 8th lens 38 is respectively f1, f2, f3, f4, f5, f6, f7 and f8, meets:
1<f2/f1<2.5,
4<f3/f4<6,
-12<f5/f6<-9,
1<f7/f8<2。
Adopt above-mentioned focal length to arrange, each focal length of lens in camera lens of the present invention can be made to distribute and tolerance distributing equilibrium, effectively can shorten lens length and reduce structural tolerance tender subject.
The abbe number of described first lens 11, second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36, the 7th lens 37 and the 8th lens 38 is respectively vdlens1, vdlens2, vdlens3, vdlens4, vdlens5, vdlens6, vdlens7 and vdlens8, meets:
45<(vdlens1,vdlens8)<55,
vdlens2>80,
vdlens6<30,
37<(vdlens3,vdlens4,vdlens7)<45。
Convex surface and the concave surface of described first lens 11 are hyperbolic-type aspheric surface.
Described first lens 11, second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36, the 7th lens 37 and the 8th lens 38 all adopt glass material to make, and the domestic glass that this camera lens product can select price lower, can technical solution of the present invention be realized, therefore can reduce production cost; And the first lens 11 adopt glass lens to be used for controlling thing side angle of incidence of light and being lowered into image distortion; Described 4th lens 14 adopt flint glass material to make, focal power be also on the occasion of, for focusing on light beam above;
Described 5th lens 35 and the 6th lens 36 are made up of refractive index and the large glass material of Abbe number difference, mainly compensate aberration.
Described 8th lens 38 are oval aspheric surface towards the convex surface of thing side, and described 8th lens 38 are oblate aspheric surface towards the convex surface of image side, and its focal power is just, therefore distortion can be reduced well, improve the illumination of peripheral field, improve the optical transfer function of system, thus promote picture element.
The spacing of described first lens 11 and the second lens 12 is A1, the spacing of described second lens 12 and the 3rd lens 13 is A2, the spacing of described 3rd lens 13 and the 4th lens 14 is A3, described 4th lens 14 are A4 with the spacing of aperture diaphragm 2, the spacing of described aperture diaphragm 2 and the 5th lens 35 is A5, the spacing of described 6th lens 36 and the 7th lens 37 is A6, the spacing of described 7th lens 37 and the 8th lens 38 is A7, described 8th lens 38 are A8 with the spacing of optical filter 4, described first lens 11 are TL with the spacing of optical filter 4, total focal length of described camera lens is f, meet:
A1/TL<0.2,
0.1<A1+A2+A3/TL<0.2,5<A4/A5<6,
0.08<A6+A7+A8/TL<0.12
0.1<f/TL<0.2。
Described first lens 11, second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36, the 7th lens 37 and the 8th lens 38 center thickness are respectively T1, T2, T3, T4, T5, T6, T7 and T8, meet:
2<T5/T6<2.5,
0.2<T1+T2+T3+T4/TL<0.3,
0.25<T5+T6+T7+T8/TL<0.35。
The aspherical surface shape of described first lens 11, the 8th lens 38 meets following equation:
Z = cy 2 / { 1 + 1 - ( 1 + k ) c 2 y 2 } + α 1 y 2 + α 2 y 4 + α 3 y 6 + α 4 y 8 + α 5 y 10 + α 6 y 12 + α 7 y 14 + α 8
In above-mentioned equation, the curvature of parameter c corresponding to each lens radius; Y is each lens radial coordinate, and its unit is identical with length of lens unit; K is each lens circular cone whose conic coefficient; α 1 to α 8 represents each coefficient corresponding to lens radial coordinate respectively.
As k <-1, the face shape curve of lens is hyperbolic curve; As k=-1, the face shape curve of lens is para-curve; As-1 < k < 0, the face shape curve of lens is oval; As k=0, the face shape curve of lens is circular; As 0 < k, the face shape curve of lens is oblate.

Claims (6)

1. high picture element is used for unmanned plane and takes photo by plane an optical imaging lens, it is characterized in that comprising front lens group (1), aperture diaphragm (2), rear lens group (3), optical filter (4) and image acquisition element (5) from the object side to image side successively;
Described front lens group (1) comprises the first lens (11) set gradually from the object side to image side, second lens (12), 3rd lens (13) and the 4th lens (14), described first lens (11) are glass aspheric lenses, described second lens (12), 3rd lens (13) and the 4th lens (14) are glass spherical lens, in described front lens group (1), each lens are convex surface towards thing side one side, and each lens are concave surface towards image side one side, the focal power of described first lens (11) and the second lens (12) is negative value, the focal power of described 3rd lens (13) and described 4th lens (14) be on the occasion of,
Described rear lens group (3) comprises the 5th lens (35) set gradually from the object side to image side, 6th lens (36), 7th lens (37) and the 8th lens (38), described 5th lens (35), 6th lens (36) and the 7th lens (37) are glass spherical lens, described 8th lens (38) are aspherical glass lens, described 5th lens (35), the two sides of the 7th lens (37) and the 8th lens (38) is convex surface, described 6th lens (36) are concave surface towards the one side of thing side, and described 6th lens (36) are convex surface towards the one side of image side, described 5th lens (35) and the 6th lens (36) are combined as balsaming lens, described 5th lens (35), 7th lens (37) and the 8th power of lens be on the occasion of, the focal power of described 6th lens (36) is negative value,
The focal length of described first lens (11), the second lens (12), the 3rd lens (13), the 4th lens (14), the 5th lens (35), the 6th lens (36), the 7th lens (37) and the 8th lens (38) is respectively f1, f2, f3, f4, f5, f6, f7 and f8, meets:
1<f2/f1<2.5,
4<f3/f4<6,
-12<f5/f6<-9,
1<f7/f8<2;
The abbe number of described first lens (11), the second lens (12), the 3rd lens (13), the 4th lens (14), the 5th lens (35), the 6th lens (36), the 7th lens (37) and the 8th lens (38) is respectively vdlens1, vdlens2, vdlens3, vdlens4, vdlens5, vdlens6, vdlens7 and vdlens8, meets:
45<(vdlens1,vdlens8)<55,
vdlens2>80,
vdlens6<30,
37<(vdlens3,vdlens4,vdlens7)<45。
2. a kind of high picture element is used for unmanned plane and takes photo by plane optical imaging lens according to claim 1, it is characterized in that the convex surface of described first lens (11) and concave surface are hyperbolic-type aspheric surface.
3. a kind of high picture element is used for unmanned plane and takes photo by plane optical imaging lens according to claim 1, it is characterized in that described 5th lens (35) and the 6th lens (36) are made up of refractive index and the large glass material of Abbe number difference.
4. a kind of high picture element is used for unmanned plane and takes photo by plane optical imaging lens according to claim 1, it is characterized in that described 8th lens (38) are oval aspheric surface towards the convex surface of thing side, and described 8th lens (38) are oblate aspheric surface towards the convex surface of image side.
5. a kind of high picture element is used for unmanned plane and takes photo by plane optical imaging lens according to claim 1, it is characterized in that described first lens (11) are A1 with the spacing of the second lens (12), described second lens (12) are A2 with the spacing of the 3rd lens (13), described 3rd lens (13) are A3 with the spacing of the 4th lens (14), described 4th lens (14) are A4 with the spacing of aperture diaphragm (2), described aperture diaphragm (2) is A5 with the spacing of the 5th lens (35), described 6th lens (36) are A6 with the spacing of the 7th lens (37), described 7th lens (37) are A7 with the spacing of the 8th lens (38), described 8th lens (38) are A8 with the spacing of optical filter (4), described first lens (11) are TL with the spacing of optical filter (4), total focal length of described camera lens is f, meet:
A1/TL<0.2,
0.1<(A1+A2+A3)/TL<0.2,5<A4/A5<6,
0.08<(A6+A7+A8)/TL<0.12
0.1<f/TL<0.2。
6. a kind of high picture element is used for unmanned plane and takes photo by plane optical imaging lens according to claim 5, it is characterized in that described first lens (11), the second lens (12), the 3rd lens (13), the 4th lens (14), the 5th lens (35), the 6th lens (36), the 7th lens (37) and the 8th lens (38) center thickness are respectively T1, T2, T3, T4, T5, T6, T7 and T8, meet:
2<T5/T6<2.5,
0.2<(T1+T2+T3+T4)/TL<0.3,
0.25<(T5+T6+T7+T8)/TL<0.35。
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