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An ultra-wide-angle lens technology, applied in the field of vehicle-mounted lens systems, can solve the problems of being unable to meet the requirements of high light-passing ability and high-definition of the camera monitoring system, weak light-passing performance, and low resolution, and achieve light weight, low cost, and high resolution effects
Active Publication Date: 2009-12-30
NINGBO SUNNY AUTOMOTIVE OPTECH
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[0002] At present, the wide-angle lens for vehicle cameras is generally composed of 5 to 8 glass lenses. For example, the wide-angle lens of Chinese Patent No. 200710201261 is composed of 6 glass lenses, but this This kind of wide-angle lens is not only heavy, but when the field of view exceeds 90°, the distortion will be very serious
For this reason, there are also wide-angle lenses deve
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[0055] Example 1 The optical parameters of the lens when F=1.08mm, FNO=2.0, 2ω=155°, and TTL=17.66mm are shown in Table 1:
[0056] Table 1
[0057] Face number
[0058] The mirror surface marked with "*" in the above table is aspherical, and its related parameters are shown in Table 2:
[0059] The following table lists the aspheric coefficients K, A, B, C, D, E of Example 1:
[0060] Table 2
[0061] Face number
[0062] Figure 7 to Figure 10 Is a graph corresponding to the optical performance of the second embodiment, where Figure 7 It is a chromatic aberration curve diagram (also called a spherical aberration curve diagram), expressed by the wavelength of the commonly used F, d, and C three-color light, and the unit is mm. Figure 8 It is the astigmatism curve graph, which is expressed by the wavelength of the commonly used F, d, and C light, and the unit is mm. Picture 9 It is a distortion curve graph, which indicates the magnitude of distortion under d...
Example Embodiment
[0063] Example 2 When F=0.95mm, FNO=2.0, 2ω=200°, TTL=19.86mm, the lens optical parameters are shown in Table 3:
[0064] table 3
[0065] Face number
[0066] The mirror surface marked with "*" in the above table is aspherical, and its related parameters are shown in Table 4:
[0067] The following table lists the aspheric coefficients K, A, B, C, D, E of Example 2:
[0068] Table 4
[0069] Face number
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Abstract
The invention relates to a super wide angle mega pixel vehicle-mounted lens, comprising two lens groups and diaphragm, wherein, starting from an object space, a front lens group with negative focal power, the diaphragm and a rear lens group with positive focal power are sequentially arranged. The front lens group comprises a first and a second lenses with negative focal power and a third lens with positive focal power; and the rear lens group comprises a glued lens plate group and a sixth lens with positive focal power. The second and the sixth lenses are aspherical lens plates, and at least one face includes an aspherical mirror face. The invention can realize super wide angle, large relative aperture and low distortion, still have high light permeability and definition in the temperature range from minus 40 DEG C to plus 85 DEG C, and is especially suitable for outdoor monitoring and a vehicle-mounted camera system under adverse environment.
Description
technical field [0001] The invention relates to a vehicle-mounted lens system, in particular to an ultra-wide-angle, mega-pixel vehicle-mounted lens suitable for outdoor monitoring and vehicle-mounted camera systems with harsh environments. Background technique [0002] At present, the wide-angle lens for vehicle-mounted cameras is generally composed of 5 to 8 glass lenses. For example, the wide-angle lens with Chinese Patent No. 200710201261 is composed of 6 glass lenses. After that, the distortion will be very serious. For this reason, there are also wide-angle lenses developed by Japanese companies that use aspheric technology to reduce weight, cost and deformation. For example, the wide-angle lens with Chinese Patent No. Although spherical lenses can correct optical distortion, their light transmission performance is weak and their resolution is low, which cannot meet the requirements of high light transmission capability and high definition for camera surveillance sy...
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