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A lens and lens technology, applied in the lens field, can solve problems such as small aperture, small imaging target surface, and increased lens size, and achieve the effect of large aperture and low cost
Active Publication Date: 2022-03-22
ZHEJIANG DAHUA TECH CO LTD
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Problems solved by technology
However, some properties are often difficult to achieve better results at the same time
[0003] With the rapid development of the lidar field, the following problems still exist in the current optical imaging lens: 1. The imaging target surface of the existing optical fixed-focus lens is small, most of which are concentrated in 1 / 2.7 inches, which cannot meet the current use requirements
2. The existing fixed-focus lenses on the market generally have small apertures, and the F numbers are all F1.6 and above
3. The lens has a large number of optical lenses. While improving the imaging quality, the size of the entire lens is also increased, which cannot meet the miniaturization design requirements
Method used
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Embodiment 1
[0058] In the specific implementation process, the curvature radius R, central thickness Tc, refractive index Nd, Abbe constant Vd and conic coefficient k of each lens of the lens meet the conditions listed in Table 1:
[0059]
[0060]
[0061] Table 1
[0062] It should be noted that the mirror serial 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.
[0063] Wherein, the lens L3 and the lens L6 in the embodiment of the present invention are aspherical lenses.
[0064] The aspherical conic coefficient can be defined by the following aspheric formula, but not limited to the following representation:
[0065]
[0066] Among them, Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the radius of curvature in value; k is the fitting conic coeffic...
Embodiment 2
[0078] In the specific implementation process, the curvature radius R, central thickness Tc, refractive index Nd, Abbe constant Vd and conic coefficient k of each lens of the lens meet the conditions listed in Table 3:
[0079]
[0080]
[0081] table 3
[0082] It should be noted that the mirror serial numbers in Table 3 are figure 1 In the schematic diagram of the lens structure shown, the surface numbers of the lenses are from left to right.
[0083] Wherein, the lens L3 and the lens L6 in the embodiment of the present invention are aspherical lenses.
[0084] The aspherical conic coefficient can be defined by the following aspheric formula, but not limited to the following representation:
[0085]
[0086] Among them, Z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the radius of curvature in value; k is the fitting conic coeffic...
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Abstract
The invention discloses a lens. A first positive power lens, a second positive power lens, a first negative power lens, a third positive power lens, a second negative power lens, a third negative power lens, an optical filter and an image surface are sequentially arranged from an object side to an image side; the third positive focal power lens and the second negative focal power lens form a balsaming lens group; the lens satisfies the following conditions: fg1 is the focal length of the balsaming lens group, f is the focal length of the lens, and FOV is the field angle of the lens. The optical lens which is high in resolution and has the characteristics of large target surface, low cost, large aperture and the like is realized.
Description
technical field [0001] The invention relates to the technical field of optical imaging, in particular to a lens. Background technique [0002] Thanks to the rapid development of autonomous driving in recent years, automotive optical lenses have been used more and more in the field of autonomous driving, especially in automotive lenses and lidar. In addition to the requirements of high pixels and small size, this type of lens has There are also more and more other requirements, such as large field of view, long focal length, small FNO, high illuminance, small distortion, and other performances that require special requirements according to different applications. However, some properties are often difficult to achieve better results at the same time. [0003] With the rapid development of the lidar field, the following problems still exist in the current optical imaging lens: 1. The imaging target surface of the existing optical fixed-focus lens is small, most of which are c...
Claims
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Application Information
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