CN105403982B - It is a kind of high as matter is used for unmanned plane optical imaging lens - Google Patents

It is a kind of high as matter is used for unmanned plane optical imaging lens Download PDF

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Publication number
CN105403982B
CN105403982B CN201511017349.7A CN201511017349A CN105403982B CN 105403982 B CN105403982 B CN 105403982B CN 201511017349 A CN201511017349 A CN 201511017349A CN 105403982 B CN105403982 B CN 105403982B
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lens
spacing
matter
unmanned plane
optical imaging
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CN105403982A (en
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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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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical 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 kind of high as matter is used for unmanned plane optical imaging lens, including front lens group and rear lens group, aperture diaphragm is provided between front lens group and rear lens group, front lens group and rear lens group use non-spherical lens, by the parameter for optimizing each lens in each front lens group and rear lens group, being allowed to camera lens of the present invention has as matter is high, visual field is big, high resolution, distortion are small, small volume, shooting picture is big, obtains the characteristics of image clearly and cost are low, available for unmanned plane optical imaging system.

Description

It is a kind of high as matter is used for unmanned plane optical imaging lens
【Technical field】
The present invention relates to optical imaging lens, more particularly to one kind are high as matter is used for unmanned plane optical imaging lens.
【Background technology】
The existing most volume of unmanned plane optical imaging system is big, visual field is small, resolution ratio is low, as matter is poor, obtains The shortcomings of information content is few.Such as the Chinese patent of Patent No. 201020555002.4 and 201210229615.2, it discloses one Kind camera lens, the overall length of camera lens is longer, and volume is larger, causes cost when on unmanned plane higher, and shooting picture is small, As matter is poor.
The present invention researchs and proposes in view of the shortcomings of the prior art.
【The content of the invention】
Instant invention overcomes the deficiencies in the prior art, there is provided a kind of high as matter is used for unmanned plane optical imaging lens Head, including front lens group and rear lens group, are provided with aperture diaphragm between front lens group and rear lens group, front lens group and it is rear thoroughly One piece of non-spherical lens is used in microscope group, by optimizing the parameter of each lens in each front lens group and rear lens group, is made Camera lens of the present invention have as matter is high, visual field is big, high resolution, distortion are small, small volume, shooting picture is big, obtains image clearly And cost it is low the characteristics of, available for unmanned plane optical imaging system.
In order to solve the above-mentioned technical problem, the present invention is a kind of high as matter is used for unmanned plane optical imaging lens, from thing Side includes front lens group, aperture diaphragm, rear lens group, optical filter and image acquisition element successively to image side.
The front lens group includes the first lens, the second lens, the 3rd lens and the set gradually from the object side to image side Four lens, first lens are glass aspheric lenses, and second lens, the 3rd lens and the 4th lens are glass sphere Lens, each lens be convex surface towards thing side one side in the front lens group, and each lens are simultaneously concave surface towards image side, institute State the first lens and the second power of lens be negative value, the 3rd lens and the 4th power of lens be on the occasion of；
The rear lens group includes the 5th lens, the 6th lens, the 7th lens and the set gradually from the object side to image side Eight lens, the 5th lens, the 6th lens and the 7th lens are glass spherical lens, and the 8th lens are aspherical glass Glass lens, the two sides of the 5th lens, the 7th lens and the 8th lens is convex surface, and the 6th lens are towards the one of thing side Face is concave surface, and the 6th lens are convex surface towards the one side of image side, and the 5th lens and the 6th lens combination are gluing Lens, the 5th lens, the 7th lens and the 8th power of lens are on the occasion of the 6th power of lens is negative Value；
First lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and The focal length of 8th lens is respectively f1, f2, f3, f4, f5, f6, f7 and f8, is met：
The ＜ f3/f4 ＜ 6 of 1 ＜ f2/f1 ＜ 2.5,4,
- 12 ＜ f5/f6 ＜ -9,1 ＜ f7/f8 ＜ 2.
First lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and The abbe number of 8th lens is respectively vd lens1, vd lens2, vd lens3, vd lens4, vd lens5, vd Lens6, vd lens7 and vd lens8, meet：
The ＜ vd lens3 ＜ 45 of 45 ＜ vd lens1 ＜ 55, vd lens2 ＞ 80,37,
37 ＜ vd lens4 ＜ 45, vd lens6 ＜ 30,
The ＜ vd lens8 ＜ 55 of 37 ＜ vd lens7 ＜ 45,45.
The convex surface and concave surface of first lens are that hyperbolic-type is aspherical.
5th lens and the 6th lens are made up of the big domestic glass material of refractive index and Abbe number difference.
8th lens are aspherical for ellipse towards the convex surface of thing side, and the 8th lens are towards the convex surface of image side It is aspherical for oblateness.
The spacing of first lens and the second lens is A1, and the spacing of second lens and the 3rd lens is A2, institute The spacing for stating the 3rd lens and the 4th lens is A3, and the spacing of the 4th lens and aperture diaphragm is A4, the aperture diaphragm Spacing with the 5th lens is A5, and the spacing of the 6th lens and the 7th lens is A6, the 7th lens and the 8th lens Spacing be A7, the spacing of the 8th lens and optical filter is A8, and the spacing of first lens and optical filter is TL, described The total focal length of camera lens is f, is met：
A1/TL ＜ 0.2,
The ＜ A4/A5 ＜ 6 of 0.1 ＜ (A1+A2+A3)/TL ＜ 0.2,5,
0.08 ＜ (A6+A7+A8)/TL ＜ 0.12
0.1 ＜ f/TL ＜ 0.2.
First lens, the second lens, the 3rd lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and 8th lens center thickness is respectively T1, T2, T3, T4, T5, T6, T7 and T8, is met：
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, the present invention is a kind of high as matter is used for unmanned plane optical imaging lens, has as follows Advantage：
1st, camera lens of the present invention uses above-mentioned technical proposal, and camera lens total focal length is 3.97mm, and the angle of visual field is 90 ° so that camera lens Optical transfer function it is larger, in 60lp/mm, the MTF of full filed>0.73, and the MTF curve of whole visual field is relatively concentrated, because This, whole visual field all has higher resolution ratio, overall as matter is preferable.
2nd, camera lens of the present invention uses above-mentioned technical proposal, and illumination image planes are integrally uniform, relative illumination be more than 0.8, brightness it is high, F-number can reach F2.8.
3rd, camera lens of the present invention uses above-mentioned technical proposal, it is possible to achieve maximum to 90 ° of wide-angle imaging.
4th, for aberration correction, high-resolution imaging is ensured, rear lens group employs a balsaming lens, i.e. the 5th lens and the Six lens bonding is balsaming lens so that the aberration of whole camera lens is smaller.
5th, in camera lens of the present invention, the first lens and the 8th lens are non-spherical lens, are advantageous to the correction of aberration, reduce system The distortion of system, the resolution ratio of camera lens is improved, make field of view center and edge that all there is good resolution ratio.
6th, camera lens of the present invention uses above-mentioned technical proposal, is combined by reasonable disposition, solves and is difficult under big visual field High-resolution and the problem of low distortion, it is only 0.92% that camera lens of the present invention distorts in maximum field of view；Meanwhile camera lens knot of the present invention Structure has the characteristics of miniaturization and weight lightness.
【Brief description of the drawings】
Fig. 1 is the structural representation of each lens arrangement 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】
The present invention will be described in detail below in conjunction with the accompanying drawings：
As shown in figure 1, a kind of height of the present invention is used for unmanned plane optical imaging lens as matter, from the object side to image side successively Including front lens group 1, aperture diaphragm 2, rear lens group 3, optical filter 4 and image acquisition element 5.Aperture diaphragm 2 is located at camera lens Middle part, for the aperture for controlling light to transmit so that imaging picture is overall uniformly, brightness is high.Rear lens group 3 is by four pieces of lens groups Into, be mainly used in reduce imaging aberration, lifted as matter；Optical filter 4 described in the embodiment of the present invention uses IR optical filters, and image is adopted Integrate element 5 as CMOS sensitive chips, when light is to enter image acquisition element 5 from optical filter 4, optical filter 4 is to IMAQ Element 5 has certain protective effect, while also filters a part of spurious rays, makes that image slices matter is clear, color is beautiful and sharp keen While with good color reducibility.
The front lens group 1 includes the first lens 11, the second lens 12, the 3rd lens set gradually from the object side to image side 13 and the 4th lens 14, first lens 11 are glass aspheric lenses, second lens 12, the 3rd lens 13 and the 4th Lens 14 are glass spherical lens, in the front lens group 1 each lens towards thing side one side be convex surface, and each lens direction Image side one side is concave surface, for controlling and reducing change in refraction angle of the light in front lens group 1 between each lens, control Imaging aberration simultaneously reduces structural tolerance sensitivities, and the focal power of the lens 12 of the first lens 11 and second is negative value, described The focal power of 3rd lens 13 and the 4th lens 14 be on the occasion of.
The rear lens group 3 includes the 5th lens 35, the 6th lens 36, the 7th lens set gradually from the object side to image side 37 and the 8th lens 38, the 5th lens 35, the 6th lens 36 and the 7th lens 37 are glass spherical lens, and the described 8th Lens 38 are aspherical glass lens, and the two sides of the 5th lens 35, the 7th lens 37 and the 8th lens 38 is convex surface, institute State the 6th lens 36 towards the one side of thing side be concave surface, and the 6th lens 36 towards the one side of image side be convex surface, described Five lens 35 and the 6th lens 36 are combined as balsaming lens, the light focus of the 5th lens 35, the 7th lens 37 and the 8th lens Degree is on the occasion of the focal power of the 6th lens 36 is negative value.
The two sides of 7th lens 37 is convex surface, and focal power be on the occasion of, be mainly used in reduce light in image planes On chief ray incidence angles, and reduce imaging aberration.
First lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36th, the focal length of the 7th lens 37 and the 8th lens 38 is respectively f1, f2, f3, f4, f5, f6, f7 and f8, is met：
The ＜ f3/f4 ＜ 6 of 1 ＜ f2/f1 ＜ 2.5,4,
- 12 ＜ f5/f6 ＜ -9,1 ＜ f7/f8 ＜ 2.
Set using above-mentioned focal length, each focal length of lens distribution and tolerance distributing equilibrium in camera lens of the present invention can be made, can Effectively to shorten lens length and reduce structural tolerance tender subject.
First lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36th, the abbe number of the 7th lens 37 and the 8th lens 38 be respectively vd lens1, vd lens2, vd lens3, vd lens4, Vd lens5, vd lens6, vd lens7 and vd lens8, meet：
The ＜ vd lens3 ＜ 45 of 45 ＜ vd lens1 ＜ 55, vd lens2 ＞ 80,37,
37 ＜ vd lens4 ＜ 45, vd lens6 ＜ 30,
The ＜ vd lens8 ＜ 55 of 37 ＜ vd lens7 ＜ 45,45.
The convex surface and concave surface of first lens 11 are that hyperbolic-type is aspherical.
First lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36th, the 7th lens 37 and the 8th lens 38 are made of glass material, and relatively low domestic of price may be selected in this camera lens product Glass, you can realize technical solution of the present invention, therefore production cost can be reduced；And first lens 11 using glass lens be used for control Thing side processed angle of incidence of light simultaneously reduces image deformation；4th lens 14 are made of flint glass material, and focal power is also On the occasion of for focusing on light beam above.
5th lens 35 and the 6th lens 36 are made up of the big glass material of refractive index and Abbe number difference, mainly Aberration is compensated.
8th lens 38 are aspherical for ellipse towards the convex surface of thing side, and the 8th lens 38 are towards image side To be oblate aspherical, its focal power can reduce distortion well for just, improve the illumination of peripheral field, raising on convex surface The optical transfer function of system, so as to be lifted as matter.
The spacing of the lens 12 of first lens 11 and second is A1, the spacing of the lens 13 of the second lens 12 and the 3rd For A2, the spacing of the 3rd lens 13 and the 4th lens 14 is A3, and the spacing of the 4th lens 14 and aperture diaphragm 2 is A4, the spacing of the lens 35 of aperture diaphragm 2 and the 5th is A5, and the spacing of the 6th lens 36 and the 7th lens 37 is A6, The spacing of 7th lens 37 and the 8th lens 38 is A7, and the spacing of the 8th lens 38 and optical filter 4 is A8, described the The spacing of one lens 11 and optical filter 4 is TL, and the total focal length of the camera lens is f, is met：
The ＜ f/TL ＜ 0.2 of A1/TL ＜ 0.2,0.1,
The ＜ A4/A5 ＜ 6 of 0.1 ＜ (A1+A2+A3)/TL ＜ 0.2,5,
0.08 ＜ (A6+A7+A8)/TL ＜ 0.12.
First lens 11, the second lens 12, the 3rd lens 13, the 4th lens 14, the 5th lens 35, the 6th lens 36th, the 7th lens 37 and the center thickness of the 8th lens 38 are respectively T1, T2, T3, T4, T5, T6, T7 and T8, are met：
2 ＜ T5/T6 ＜ 2.5,
0.2 ＜ (T1+T2+T3+T4)/TL ＜ 0.3,
0.25 ＜ (T5+T6+T7+T8)/TL ＜ 0.35.
First lens 11, the aspherical surface shape of the 8th lens 38 meet below equation：
In above-mentioned equation, parameter c is the curvature corresponding to each lens radius；Y is each lens radial coordinate, its unit It is identical with length of lens unit；K is each lens circular cone whose conic coefficient；α 1 to α 8 represents each lens radial coordinate respectively Corresponding coefficient.
As k ＜ -1, the face shape curve of lens is hyperbola；As k=-1, the face shape curve of lens is parabola；When- During 1 ＜ k ＜ 0, the face shape curve of lens is ellipse；As k=0, the face shape curve of lens is circle；As 0 ＜ k, lens Face shape curve is oblateness.

Claims (6)

  1. It is 1. a kind of high as matter is used for unmanned plane optical imaging lens, it is characterised in that to include successively from the object side to image side preceding saturating Microscope group (1), aperture diaphragm (2), rear lens group (3), optical filter (4) and image acquisition element (5)；
    It is the first lens (11) that the front lens group (1) includes setting gradually from the object side to image side, the second lens (12), the 3rd saturating Mirror (13) and the 4th lens (14), first lens (11) are glass aspheric lenses, second lens (12), the 3rd saturating Mirror (13) and the 4th lens (14) are glass spherical lens, and each lens are simultaneously convex towards thing side in the front lens group (1) Face, and each lens are concave surface towards image side one side, the focal power of first lens (11) and the second lens (12) is negative value, The focal power of 3rd lens (13) and the 4th lens (14) be on the occasion of；
    It is the 5th lens (35) that the rear lens group (3) includes setting gradually from the object side to image side, the 6th lens (36), the 7th saturating Mirror (37) and the 8th lens (38), the 5th lens (35), the 6th lens (36) and the 7th lens (37) are glass sphere Lens, the 8th lens (38) are aspherical glass lens, the 5th lens (35), the 7th lens (37) and the 8th lens (38) two sides is convex surface, the 6th lens (36) towards the one side of thing side be concave surface, and the 6th lens (36) court It is convex surface to the one side of image side, the 5th lens (35) are combined as balsaming lens, the 5th lens with the 6th lens (36) (35), the 7th lens (37) and the 8th power of lens are on the occasion of the focal power of the 6th lens (36) is negative value；
    First lens (11), the second lens (12), the 3rd lens (13), the 4th lens (14), the 5th lens (35), the 6th The focal length of lens (36), the 7th lens (37) and the 8th lens (38) is respectively f1, f2, f3, f4, f5, f6, f7 and f8, is met：
    The ＜ f3/f4 ＜ 6 of 1 ＜ f2/f1 ＜ 2.5,4,
    - 12 ＜ f5/f6 ＜ -9,1 ＜ f7/f8 ＜ 2；
    First lens (11), the second lens (12), the 3rd lens (13), the 4th lens (14), the 5th lens (35), the 6th The abbe number of lens (36), the 7th lens (37) and the 8th lens (38) is respectively vd lens1, vd lens2, vd Lens3, vd lens4, vd lens5, vd lens6, vd lens7 and vd lens8, meet：
    The ＜ vd lens3 ＜ 45 of 45 ＜ vd lens1 ＜ 55, vd lens2 ＞ 80,37,
    37 ＜ vd lens4 ＜ 45, vd lens6 ＜ 30,
    The ＜ vd lens8 ＜ 55 of 37 ＜ vd lens7 ＜ 45,45.
  2. It is 2. a kind of high as matter is used for unmanned plane optical imaging lens according to claim 1, it is characterised in that described the The convex surface and concave surface of one lens (11) are that hyperbolic-type is aspherical.
  3. It is 3. a kind of high as matter is used for unmanned plane optical imaging lens according to claim 1, it is characterised in that described the Five lens (35) and the 6th lens (36) are made up of the big glass material of refractive index and Abbe number difference.
  4. It is 4. a kind of high as matter is used for unmanned plane optical imaging lens according to claim 1, it is characterised in that described the Eight lens (38) are aspherical for ellipse towards the convex surface of thing side, and the 8th lens (38) are oblate towards the convex surface of image side Shape is aspherical.
  5. It is 5. a kind of high as matter is used for unmanned plane optical imaging lens according to claim 1, it is characterised in that described the The spacing of one lens (11) and the second lens (12) is A1, and second lens (12) and the spacing of the 3rd lens (13) are A2, 3rd lens (13) and the spacing of the 4th lens (14) are A3, the 4th lens (14) and the spacing of aperture diaphragm (2) For A4, the aperture diaphragm (2) and the spacing of the 5th lens (35) are A5, the 6th lens (36) and the 7th lens (37) Spacing is A6, and the 7th lens (37) and the spacing of the 8th lens (38) are A7, the 8th lens (38) and optical filter (4) Spacing be A8, the spacing of first lens (11) and optical filter (4) be TL, and the total focal length of the camera lens is f, satisfaction：
    A1/TL ＜ 0.2,
    The ＜ A4/A5 ＜ 6 of 0.1 ＜ (A1+A2+A3)/TL ＜ 0.2,5,
    0.08 ＜ (A6+A7+A8)/TL ＜ 0.12
    0.1 ＜ f/TL ＜ 0.2.
  6. It is 6. a kind of high as matter is used for unmanned plane optical imaging lens according to claim 5, it is characterised in that described the One lens (11), the second lens (12), the 3rd lens (13), the 4th lens (14), the 5th lens (35), the 6th lens (36), 7th lens (37) and the 8th lens (38) center thickness are respectively T1, T2, T3, T4, T5, T6, T7 and T8, are met：
    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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