Low distortion wide-angle lens

Abstract

The invention relates to a low distortion wide-angle lens, including a first lens, a second lens, a third lens, a aperture, a fourth lens, a fifth lens, a sixth lens and a seventh lens along the optical axis from the object side to the image side arranged in sequence. The first lens, the second lens, the fourth lens and the seventh lens are negative focal lenses. The third lens, the fifth lens andthe sixth lens are positive focal lenses. The fourth lens and the fifth lens form a glued lens group. The first lens and the second lens bend to the aperture. The low distortion wide-angle lens according to the invention has the advantages of wide field angle and low distortion.

Description

technical field [0001] The invention relates to an optical lens, in particular to a low-distortion wide-angle lens. Background technique [0002] Wide-angle lenses are widely used in security monitoring, vehicle recording, real-time video, etc. With the expansion of the application field, higher requirements are put forward for the comprehensive performance of the wide-angle lens. The wide-angle lens used in security must achieve the same focus position of visible light and infrared light without focusing; the wide-angle lens on the vehicle recorder, It is necessary to ensure that the resolution does not drift with temperature changes at low or high temperatures; and the wide-angle lens for real-time video must meet the large field of view while ensuring low distortion. [0003] At present, the common wide-angle lens is generally composed of 6-10 lenses. As shown in the Chinese patent with the patent number "CN 101930111 A", the lens adopts a 5-group 6-piece all-glass struc...

AI Technical Summary

Problems solved by technology

[0003] At present, the common wide-angle lens is generally composed of 6-10 lenses. As shown in the Chinese patent with the patent number "CN 101930111 A", the lens adopts a 5-group 6-piece all-glass structure, which makes the weight of the lens heavier and the total optical length longer. Long, can not meet the requirements of miniaturization, and the cost of all-glass lenses is high and has no market advantage

And the aperture of this wide-angle lens is 2.4. In theory, the larger the aperture value, the less light flux entering the optical system, resulting in darker brightness at the edge of the image surface, which greatly reduces the clarity of the image surface.

Another example is the wide-angle lens of the Chinese patent whose patent number is "CN 103499874 B", which is composed of 6 lenses, all of which use traditional spherical technology, and all lenses are spherical lenses, so the distortion cannot be effectively controlled

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