CN205193338U - Big low aspherical mirror head that zooms of light that leads to - Google Patents
Big low aspherical mirror head that zooms of light that leads to Download PDFInfo
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- CN205193338U CN205193338U CN201520875000.6U CN201520875000U CN205193338U CN 205193338 U CN205193338 U CN 205193338U CN 201520875000 U CN201520875000 U CN 201520875000U CN 205193338 U CN205193338 U CN 205193338U
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Abstract
The utility model relates to a big low aspherical mirror head that zooms of light that leads to, it organizes the preceding A of group, the change B of group of lens group and set up the diaphragm C who organizes between A and the B of change group of lens group before the lens is organized to set gradually the lens along the light incidence direction among the optical system of camera lens, the A of group has set gradually burden month tooth form lens A -1, biconcave plastics aspherical lens A -2 and biconvex lens A -3 along the light incidence orientation before the lens group, the B of change group of lens group has set gradually biconvex plastics aspherical lens B -1, biconvex lens B -2, burden month tooth form lens B -3 and biconvex plastics aspherical lens B -4 along the light incidence orientation. The flint glass that high refraction, low chromatic dispersion were chooseed for use to this camera lens and the crown glass of lower refracting index come the achromatism, have used the plastics aspheric surface, fine correction the distortion of camera lens, the edge is reductive very true like matter to this camera lens has reduced manufacturing cost because used glass still less, has also alleviateed the lens assembly degree of difficulty.
Description
Technical field
The utility model relates to video frequency camera sensor field, particularly logical greatly light low distortion zoom aspheric lens.
Background technology
The mid-90 in last century is born in by web camera, and camera lens is as the main composition part of video camera, and its performance directly affects image quality.Early stage market there is various zoom lens be applied in safety-protection system, but along with the rapid emergence in safety monitoring market, the optimization of Digital Signal Processing and network transfer speeds promotes, the quality requirements of safety monitoring camera lens is improved greatly, from common supervision demand to the discriminating of high definition, but because the optical mirror slip of a lot of product is more, add assembling adjustment difficulty, spectrophotometric data is lower, great majority belong to low-end product, can only the common camera of adaptive lower pixel, and be difficult to realize large wide-angle, large logical light, low distortion, high resolving power, day and night confocal, weatherability and the advantage such as eyeglass sheet number is less, on the other hand, less in optical lens use plastic aspherical element.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is the day and night confocal large logical light low distortion zoom aspheric lens providing a kind of high picture element, logical greatly light, low distortion, low cost, good weatherability.
To achieve these goals, a technical scheme of the present utility model is: large logical light low distortion zoom aspheric lens, A is organized before being disposed with lens set along light direction in the optical system of described camera lens, lens set change group B and the diaphragm C before being arranged on lens set between group A and lens set change group B, before described lens set, group A is disposed with negative selenodont lens A-1 along light direction, concave-concave plastic aspheric lens A-2 and biconvex lens A-3, described lens set change group B is disposed with biconvex plastic aspheric lens B-1 along light direction, biconvex lens B-2, negative selenodont lens B-3 and biconvex plastic aspheric lens B-4.
Further, the short burnt airspace before described lens set between group A and lens set change group B is 21.7mm, and the focal length airspace before described lens set between group A and lens set change group B is 2.1mm.
Further, the airspace between the negative selenodont lens A-1 before described lens set in group A and concave-concave plastic aspheric lens A-2 is 5.3mm, and the airspace between described concave-concave plastic aspheric lens A-2 and biconvex lens A-3 is 0.7mm.
Further, airspace between biconvex plastic aspheric lens B-1 in described lens set change group B and biconvex lens B-2 is 0.1mm, airspace between described biconvex lens B-2 and negative selenodont lens B-3 is 0.1mm, and the airspace between described negative selenodont lens B-3 and biconvex plastic aspheric lens B-4 is 1.1mm.
Compared with prior art, the utility model has the following advantages: select high refraction, low dispersion flint glass with carry out achromatism compared with the crown glass of low-refraction, employ plastic aspherical element, well correct the distortion of camera lens, edge picture element reduction very true, is using the situation of less glass to be issued to better resolution, and this camera lens due to glass used less, also mitigate eyeglass assembly difficulty, reduce production cost.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Optical system diagram when Fig. 1 is short Jiao of the utility model embodiment;
Optical system diagram when Fig. 2 is the focal length of the utility model embodiment;
Fig. 3 focuses on the MTF figure made under visible ray central vision picture element optimal cases under short Jiao;
Fig. 4 is that the night vision MTF that Fig. 3 is corresponding schemes;
Fig. 5 focuses on the MTF figure made under visible ray central vision picture element optimal cases under focal length;
Fig. 6 is that the night vision MTF that Fig. 5 is corresponding schemes.
In Fig. 1: group before A-lens set, A-1-negative crescent moon lens A-1, A-2-concave-concave plastic aspheric lens A-2, A-3-biconvex lens A-3, B-lens set change group, B-1-biconvex plastic aspheric lens B-1, B-2-biconvex lens B-2, B-3-negative selenodont lens B-3, B-4-biconvex plastic aspheric lens B-4, C-diaphragm, D-image planes.
Embodiment
In order to allow above-mentioned feature and advantage of the present utility model become apparent, special embodiment below, and coordinate accompanying drawing, be described in detail below.
As shown in Figure 1 and 2, large logical light low distortion zoom aspheric lens, A is organized before being disposed with lens set along light direction in the optical system of described camera lens, lens set change group B and the diaphragm C before being arranged on lens set between group A and lens set change group B, before described lens set, group A is disposed with negative selenodont lens A-1 along light direction, concave-concave plastic aspheric lens A-2 and biconvex lens A-3, described lens set change group B is disposed with biconvex plastic aspheric lens B-1 along light direction, biconvex lens B-2, negative selenodont lens B-3 and biconvex plastic aspheric lens B-4.
In the present embodiment, the short burnt airspace before described lens set between group A and lens set change group B is 21.7mm, and the focal length airspace before described lens set between group A and lens set change group B is 2.1mm.
In the present embodiment, the airspace between the negative selenodont lens A-1 before described lens set in group A and concave-concave plastic aspheric lens A-2 is 5.3mm, and the airspace between described concave-concave plastic aspheric lens A-2 and biconvex lens A-3 is 0.7mm.
In the present embodiment, airspace between biconvex plastic aspheric lens B-1 in described lens set change group B and biconvex lens B-2 is 0.1mm, airspace between described biconvex lens B-2 and negative selenodont lens B-3 is 0.1mm, and the airspace between described negative selenodont lens B-3 and biconvex plastic aspheric lens B-4 is 1.1mm.
In the present embodiment, when optical design, reasonable distribution is carried out to the focal power of camera lens, camera lens is made to obtain correcting and balance at the aberration of the wavelength coverage of 480 ~ 656nm, such camera lens can not only blur-free imaging under photoenvironment in the daytime, under the environment of pole low-light (level) at night, by 850nm infrared light light filling, also can blur-free imaging; The focal power of three plastic aspherical element eyeglasses is complementary, and group have employed two panels plastic aspherical element especially afterwards, ensures that camera lens is under temperature-30 ~ 60 DEG C of environment, can make up mutually, thus can blur-free imaging.The distortion of camera lens is little, ensures that the reductibility of the edge imaging of camera lens is higher.
In the present embodiment, this logical greatly light low distortion zoom aspheric lens reaches following technical indicator: (1) short focal length: f '=2.8mm; Focal length focal length: f '=12mm; (2) relative aperture F=1.2 ~ 2.2; (3) field angle: 2w >=38 ° ~ 132 ° (image space is as visual field 2 η ' >=Ф 6.6mm); (4) distort: <-4%; (5) resolution: can be adaptive with 5,000,000 pixel high-resolution CCD or cmos camera; (6) light path overall length ∑≤50mm, optics rear cut-off distance L ' >=8mm; (7) spectral line scope: 480 ~ 850nm is suitable for.
In the present embodiment, from Fig. 3 and Fig. 4, during short Jiao, the distance difference of visible ray and infrared light lens back focal plane is very little, and same image planes can meet high-quality imaging requirements.During visual light imaging, central vision 150 line is greater than 0.65 to place, and peripheral field 150 line is greater than 0.38 to place; During infrared 0.85 mum wavelength imaging, central vision 150 line is greater than 0.7 to place, and peripheral field 150 line is greater than 0.39 to place.Visible ray is almost consistent with the effect of near infrared imaging, meets day and night confocal imaging requirements.
In the present embodiment, from Fig. 5 and Fig. 6, during focal length, during visual light imaging, central vision 150 line is greater than 0.42 to place, and peripheral field 150 line is greater than 0.3 to place; During infrared 0.85 mum wavelength imaging, central vision 150 line is greater than 0.58 to place, and peripheral field 150 line is greater than 0.34 to place.Visible ray is almost consistent with the effect of near infrared imaging, and focal plane drift is very little, can meet high-quality imaging requirements in same image planes, meets day and night confocal imaging requirements.
The foregoing is only preferred embodiment of the present utility model, all equalizations done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (4)
1. large logical light low distortion zoom aspheric lens, it is characterized in that: before being disposed with lens set along light direction in the optical system of described camera lens, organize A, lens set change group B and the diaphragm C before being arranged on lens set between group A and lens set change group B, before described lens set, group A is disposed with negative selenodont lens A-1 along light direction, concave-concave plastic aspheric lens A-2 and biconvex lens A-3, described lens set change group B is disposed with biconvex plastic aspheric lens B-1 along light direction, biconvex lens B-2, negative selenodont lens B-3 and biconvex plastic aspheric lens B-4.
2. large logical light low distortion zoom aspheric lens according to claim 1, it is characterized in that: the short burnt airspace before described lens set between group A and lens set change group B is 21.7mm, the focal length airspace before described lens set between group A and lens set change group B is 2.1mm.
3. large logical light low distortion zoom aspheric lens according to claim 1, it is characterized in that: the airspace between the negative selenodont lens A-1 before described lens set in group A and concave-concave plastic aspheric lens A-2 is 5.3mm, and the airspace between described concave-concave plastic aspheric lens A-2 and biconvex lens A-3 is 0.7mm.
4. large logical light low distortion zoom aspheric lens according to claim 1, it is characterized in that: the airspace between the biconvex plastic aspheric lens B-1 in described lens set change group B and biconvex lens B-2 is 0.1mm, airspace between described biconvex lens B-2 and negative selenodont lens B-3 is 0.1mm, and the airspace between described negative selenodont lens B-3 and biconvex plastic aspheric lens B-4 is 1.1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520875000.6U CN205193338U (en) | 2015-11-05 | 2015-11-05 | Big low aspherical mirror head that zooms of light that leads to |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520875000.6U CN205193338U (en) | 2015-11-05 | 2015-11-05 | Big low aspherical mirror head that zooms of light that leads to |
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| CN205193338U true CN205193338U (en) | 2016-04-27 |
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| CN201520875000.6U Active CN205193338U (en) | 2015-11-05 | 2015-11-05 | Big low aspherical mirror head that zooms of light that leads to |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242378A (en) * | 2015-11-05 | 2016-01-13 | 福建福光股份有限公司 | High-transmittance and low-distortion aspheric zoom lens |
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2015
- 2015-11-05 CN CN201520875000.6U patent/CN205193338U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242378A (en) * | 2015-11-05 | 2016-01-13 | 福建福光股份有限公司 | High-transmittance and low-distortion aspheric zoom lens |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |