A wide-angle photographic lens

Abstract

The invention relates to a wide-angle photographic lens which comprises lens I, a lens II, a lens III, a diaphragm, a lens IV, a glass optical filter, protection glass and an imaging surface in sequence from an object side to an image side, wherein both the lens II and the lens IV are aspherical plastic lenses; the lens I is a negative refraction force lens; the lens II is a negative refraction force lens; the lens III is a biconvex lens; the lens IV is a positive refraction force lens. According to the wide-angle photographic lens, field angle of the lens system can be effectively enlarged to 170 degrees above so as to ensure the stability of the lens under high / low-temperature environment and improve the imaging capability under the weak light environment; by adopting a four-lens structure, the structure of the lens is compact, the optical overall length can be effectively shortened, the size of the lens group is relatively small and the lens mass is lightened.

Description

technical field [0001] The invention relates to the field of optical devices, in particular to a 300,000-pixel wide-angle photographic lens. Background technique [0002] The optical lens is an essential part of the machine vision system, which directly affects the quality of the image and affects the realization and effect of the algorithm. Optical lenses can be divided into short-focus lenses, medium-focus lenses, and telephoto lenses in terms of focal length; wide-angle, standard, and telephoto lenses in terms of field of view; fixed-aperture fixed-focus lenses and manual aperture fixed-focus lenses in terms of structure. Auto iris fixed focus lens, manual zoom lens, auto zoom lens, auto iris electric zoom lens, electric triple variable lens, etc. [0003] At present, with the continuous and rapid development of my country's economy, cameras are applied to various fields. At present, wide-angle lenses are generally composed of 5 to 8 glass lenses, and the lenses are larg...

AI Technical Summary

Problems solved by technology

[0003] At present, with the continuous rapid development of my country's economy, cameras are applied to various fields. At present, wide-angle lenses are generally composed of 5 to 8 glass lenses, and the lens is large in size and heavy in quality.

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