CN105372797B - A kind of mini-focal aspheric lens - Google Patents

A kind of mini-focal aspheric lens Download PDF

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Publication number
CN105372797B
CN105372797B CN201510741024.7A CN201510741024A CN105372797B CN 105372797 B CN105372797 B CN 105372797B CN 201510741024 A CN201510741024 A CN 201510741024A CN 105372797 B CN105372797 B CN 105372797B
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China
Prior art keywords
lens
concave
biconvex
aspheric lens
plastic aspheric
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CN201510741024.7A
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CN105372797A (en
Inventor
陈文静
吴志良
蔡鹏腾
林宁
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Fujian Forecam Optics Co Ltd
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Fujian Forecam Optics Co Ltd
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/177Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses

Abstract

The present invention relates to a kind of mini-focal aspheric lens, in the optical system of the camera lens along light from front to back incident direction be sequentially provided with preceding group of A, diaphragm C and after organize B, group A includes negative selenodont lens A 1, biconcave lens A 2 and the biconvex lens A 3 set gradually from front to back before described, and the rear group B includes biconvex plastic aspheric lens B 1, positive selenodont plastic aspheric lens B 2, concave-concave plastic aspheric lens B 3, biconvex lens B 4, the concave-concave plastic aspheric lens B 5 set gradually from front to back.The camera lens can be good at correcting the aberration of the outer visual field of axle, while daytime can reach high-quality pixel, in insufficient light or identical picture matter can be also reached in the case of night, it ensure that the day and night confocal function of camera lens, it is compact conformation, compact structure, with low cost, easily match, while reducing processing cost, improve as matter level with machinery.

Description

A kind of mini-focal aspheric lens
Technical field
The present invention relates to a kind of mini-focal aspheric lens, belong to field of photoelectric technology.
Background technology
Web camera is born in the mid-90 in last century, and camera lens is used as the main composition part of video camera, its property Image quality can be directly affects.Early stage in the market has various zoom lens to be applied in safety-protection system, but is due to The optical mirror slip of many products is more, adds assembling adjustment difficulty, and spectrophotometric data is relatively low, most of to belong to low side production Product, can only be adapted to the common camera compared with low pixel, and big wide-angle, high-resolution, day and night confocal and eyeglass piece difficult to realize The advantages of number is less.
The content of the invention
In view of this, it is an object of the invention to provide a kind of compact conformation, the mini-focal aspheric lens of compact, Camera lens cost is reduced, while daytime can reach high-quality pixel, in insufficient light or phase can be also reached in the case of night With as matter, it is ensured that the day and night confocal function of camera lens.
The present invention is realized using following scheme:Edge in a kind of mini-focal aspheric lens, the optical system of the camera lens Light from front to back incident direction be sequentially provided with preceding group of A, diaphragm C and after organize B, it is described before group A include setting gradually from front to back Negative selenodont lens A-1, biconcave lens A-2 and biconvex lens A-3, it is described after group B include setting gradually from front to back it is double Convex plastic aspheric lens B-1, positive selenodont plastic aspheric lens B-2, concave-concave plastic aspheric lens B-3, biconvex lens B-4, concave-concave plastic aspheric lens B-5.
Further, the airspace between the preceding group A and rear group B is 1.5mm ~ 11.3mm.
Further, the airspace between the negative selenodont lens A-1 and biconcave lens A-2 is 3.5mm, and concave-concave is saturating Airspace between mirror A-2 and biconvex lens A-3 is 0.8mm, and the biconvex plastic aspheric lens B-1 is moulded with positive selenodont It is 0.1mm, the positive selenodont plastic aspheric lens B-2 and concave-concave plastics to expect the airspace between non-spherical lens B-2 Airspace between non-spherical lens B-3 is 0.1mm, between the concave-concave plastic aspheric lens B-3 and biconvex lens B-4 Airspace be 1mm, the airspace between biconvex lens B-4 and concave-concave the plastic aspheric lens B-5 is 0.1mm.
Compared with prior art, the invention has the advantages that:The camera lens can be good at correcting the outer visual field of axle Aberration, while daytime can reach high-quality pixel, in insufficient light or identical picture matter can be also reached in the case of night, protected Demonstrate,proved the day and night confocal function of camera lens, with the big angle of visual field, high-resolution, day and night, compact optical texture, compact structure, With low cost the advantages of, it can be adapted to the CCD or CMOS of 3,000,000 pixel high-resolutions, be micro-television monitored video camera system Main product, while having used four plastic aspherical elements, greatly reduces processing cost, improves as matter level.
For the objects, technical solutions and advantages of the present invention are more clearly understood, specific embodiment and phase will be passed through below Accompanying drawing is closed, the present invention is described in further detail.
Brief description of the drawings
Fig. 1 is the optical system schematic diagram of the embodiment of the present invention;
Embodiment
As shown in figure 1, entering from front to back along light in a kind of mini-focal aspheric lens, the optical system of the camera lens Penetrate direction be sequentially provided with preceding group of A, diaphragm C and after organize B, it is described before group A include the negative selenodont lens that set gradually from front to back A-1, biconcave lens A-2 and biconvex lens A-3, the biconvex plastic aspherical element that the rear group B includes setting gradually from front to back are saturating Mirror B-1, positive selenodont plastic aspheric lens B-2, concave-concave plastic aspheric lens B-3, biconvex lens B-4, concave-concave plastics are non- Spherical lens B-5.
In the present embodiment, the airspace between the preceding group A and rear group B is 1.5mm ~ 11.3mm.
In the present embodiment, the airspace between the negative selenodont lens A-1 and biconcave lens A-2 is 3.5mm, double Airspace between concavees lens A-2 and biconvex lens A-3 is 0.8mm, the biconvex plastic aspheric lens B-1 and positive crescent moon Airspace between plastic non-spherical lens B-2 is 0.1mm, positive the selenodont plastic aspheric lens B-2 and concave-concave Airspace between plastic aspheric lens B-3 is 0.1mm, the concave-concave plastic aspheric lens B-3 and biconvex lens B-4 Between airspace be 1mm, the airspace between biconvex lens B-4 and concave-concave the plastic aspheric lens B-5 is 0.1mm。
The camera lens not only compact conformation, compact and can realize zoom, from height refraction, the flint glass of low dispersion with Crown glass compared with low-refraction carrys out achromatism, and has used 4 plastic aspherical elements, and the picture of the outer visual field of axle is corrected well Difference, largely reduces camera lens cost, while daytime can reach high-quality pixel, in insufficient light or the situation at night Under can also reach identical picture matter, it is ensured that the day and night confocal function of camera lens.
In optical design, the focal power to camera lens carries out reasonable distribution, especially with plastic aspherical element, makes camera lens On the axle of 480 ~ 656nm wave-length coverage, off-axis aberration be obtained for correction with balance.What so camera lens can not only be in the daytime Blur-free imaging under photoenvironment,, also can blur-free imaging by 850nm infrared light light fillings under night extremely low illumination environment.Overcome There is provided a high as matter, day and night small size, confocal optical lens for the deficiencies in the prior art.
The lens barrel of the camera lens of the present invention is using conventional mechanical structure, including body tube, and the body tube leading section is provided with To the preceding group of microscope base installed preceding group of A and can moved forward and backward, body tube rearward end is provided with the rear group of microscope base to organize B after installing, Group microscope base is moved forward and backward to realize focusing before the body tube front end is driven by cam and guide pin.
The optical system being made up of above-mentioned lens set has reached following optical index:
1. short focus focal length:f′=3.1mm;Focal length focal length:f′=6.4mm;
2. relative aperture F=1.8 ~ 2.4;
3. the angle of visual field:2w≥38°~132°(Image space is as the η ' of visual field 2 >=Ф 6.6mm);
4. distortion:< -70%;
5. resolution ratio:It can be adapted to 3,000,000 pixel high-resolution CCD or cmos camera;
6. total length of light path ∑≤31.5mm, optics rear cut-off distance L ' >=3.5mm;
7. it is applicable spectral line scope:480~850nm.
Focused under short focus and cause visible ray central vision as the MTF figures and the MTF figures of correspondence night vision under matter optimal cases In, during short focus, it is seen that the distance difference very little of light and infrared light lens back focal plane, it can meet high-quality in same image planes Imaging requirements.During visual light imaging, the line of central vision 150 is more than 0.65 to place, and the line of peripheral field 150 is more than 0.38 to place; During infrared 0.85 mum wavelength imaging, the line of central vision 150 is more than 0.7 to place, and the line of peripheral field 150 is more than 0.4 to place.Visible ray It is almost consistent with the effect of infrared imaging, meet day and night confocal imaging requirements.
Focused under focal length and cause visible ray central vision as the MTF figures and the MTF figures of correspondence night vision under matter optimal cases In, during focal length, it is seen that during photoimaging, the line of central vision 150 is more than 0.43 to place, and the line of peripheral field 150 is more than 0.3 to place;It is red During outer 0.85 mum wavelength imaging, the line of central vision 150 is more than 0.57 to place, and the line of peripheral field 150 is more than 0.33 to place.Visible ray Almost consistent with the effect of infrared imaging, focal plane drift very little can meet high-quality imaging requirements in same image planes, meet Day and night confocal imaging requirements.
The object, technical solutions and advantages of the present invention are further described by above-listed preferred embodiment, are answered Understand, the foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.

Claims (1)

1. a kind of mini-focal aspheric lens, it is characterised in that:Enter from front to back along light in the optical system of the camera lens Penetrate direction be sequentially provided with preceding group of A, diaphragm C and after organize B, it is described before group A include the negative selenodont lens that set gradually from front to back A-1, biconcave lens A-2 and biconvex lens A-3, the biconvex plastic aspherical element that the rear group B includes setting gradually from front to back are saturating Mirror B-1, positive selenodont plastic aspheric lens B-2, concave-concave plastic aspheric lens B-3, biconvex lens B-4, concave-concave plastics are non- Spherical lens B-5;Airspace before described between group A and rear group B is 1.5mm ~ 11.3mm;The negative selenodont lens A-1 Airspace between biconcave lens A-2 is 3.5mm, and the airspace between biconcave lens A-2 and biconvex lens A-3 is Airspace between 0.8mm, the biconvex plastic aspheric lens B-1 and positive selenodont plastic aspheric lens B-2 is Airspace between 0.1mm, positive selenodont plastic aspheric lens B-2 and concave-concave the plastic aspheric lens B-3 is 0.1mm, the airspace between the concave-concave plastic aspheric lens B-3 and biconvex lens B-4 is 1mm, the biconvex lens Airspace between B-4 and concave-concave plastic aspheric lens B-5 is 0.1mm;Short focus focal length f '=3.1mm of the camera lens, length Focal length f '=6.4mm, relative aperture F=1.8 ~ 2.4, angle of visual field 2w >=38 ° ~ 132 °, total length of light path ∑≤31.5mm, optics Rear cut-off distance L ' >=3.5mm.
CN201510741024.7A 2015-11-05 2015-11-05 A kind of mini-focal aspheric lens Active CN105372797B (en)

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CN105372797B true CN105372797B (en) 2017-10-03

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CN106371195A (en) * 2016-11-23 2017-02-01 福建福光股份有限公司 Large-wide-angle, high-light-flux and high-definition prime lens
CN112747819A (en) * 2020-12-22 2021-05-04 中国航天科工集团八五一一研究所 Large-view-field imaging solar blind ultraviolet detection system and implementation method thereof

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CN104076497B (en) * 2013-03-28 2015-06-17 浙江大华技术股份有限公司 Zoom lens and digital camera
CN104965298B (en) * 2015-06-30 2017-08-29 东莞市宇瞳光学科技股份有限公司 A kind of wide-angle zoom lens of small volume

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