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A lens and lens technology, applied in the lens field, can solve problems such as poor image quality, affecting image clarity, and large light pollution
Active Publication Date: 2020-06-02
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology
[0002] At present, the actual aperture of common traffic lenses on the market is mostly F1.5 to 1.8. In low-light scenes, the imaging brightness is low, and the image noise is more, which affects the image clarity. make light pollution
In addition, the resolution of a few lenses with large apertures on the market is relatively low, generally 5 million pixels, and the quality of the captured images is poor.
Method used
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Embodiment 1
[0094] The focal length f of the lens is 8.52 mm, the aperture Fno is 1.3, and the total length TTL of the lens is about 116 mm.
[0095] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 1:
[0096]
[0097]
[0098] Table 1
[0099] It should be noted that the face numbers in Table 1 are figure 1 In the schematic diagram of the lens structure shown, the surface numbers of the lenses are from left to right.
[0100] According to the data in Table 1 and related formulas, it can be obtained: |f1*f2 / (f series*f series*3)|=1.00, f1=-9.16mm, f2=23.86mm; The shell number is 68.62; BFL / f system=1.41.
[0101] The lens structure of the embodiment of the present invention is as figure 1 As shown, the lens provided in Embodiment 1 will be further introduced below by analyzing the optical system of Embodiment 1 in detail.
[0105] The focal length f of the lens is 8.6 mm, the aperture Fno is 1.31, and the total length TTL of the lens is 115.8 mm.
[0106] The data such as the radius of curvature, central thickness, refractive index nd, and Abbe constant Vd of each lens are shown in Table 2:
[0107]
[0108]
[0109] Table 2
[0110] According to the data in Table 2 and related formulas, it can be obtained: |f1*f2 / (f series*f series*3)|=1.30, f1=-10.25mm, f2=28.28mm; The shell number is 81.61; BFL / f system=1.47.
[0111] The lens structure of the embodiment of the present invention is as figure 2 As shown, the lens provided by this embodiment 2 is further introduced below through a detailed optical system analysis of embodiment 2.
[0112] Figure 4 is the transfer function (MTF) curve of the system, such as Figure 4 , it can be seen that the curve descends smoothly and converges. At 145lp / mm, the MTF value within 8.8mm of y' image height is greater than 0.3. This enables the syste...
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Abstract
The invention discloses a lens. The lens comprises a first lens group, a second lens group, a third lens group and an image plane which are sequentially arranged from an object side to an image side,and the lens groups satisfy the following condition of 0.8 <|f1*f2 / (f system * f system*3) | <1.5; BFL / f system >1.30, wherein f1 is the focal length of the first lens group, f2 is the focal length ofthe second lens group, f is the system focal length of the lens, and BFL is the distance between the third lens group and the image plane. According to the embodiment of the invention, the three lensgroups are sequentially arranged in the lens from the object side to the image side according to a specific sequence, and the lens groups in the lens satisfy 0.8 <| f1 * f2 / (f * f system * 3) | <1.5,BFL / f system> 1.30, so that the embodiment of the invention provides a super-starlight wide-angle lens.
Description
technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] At present, the actual aperture of common traffic lenses on the market is mostly F1.5 to 1.8. In low-light scenes, the imaging brightness is low, and the image noise is more, which affects the image clarity. Make light pollution bigger. In addition, the resolution of a few lenses with large apertures on the market is relatively low, generally 5 million pixels, and the quality of the captured images is poor. As the road transportation industry advances towards intelligence, high-definition, and environmental protection, it is necessary for the lens to achieve higher performance. Therefore, it is particularly important to develop a super starlight wide-angle lens with a large aperture and high resolution. Contents of the invention [0003] An embodiment of the present invention provides a lens, which is used to provide a super star...
Claims
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Application Information
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