Large-view-field low-distortion lens

Abstract

The invention relates to a prime lens, in particular to a large-view-field low-distortion lens which can be applied to space and ground imaging. The invention aims to solve the technical problems of large distortion and serious stray halo of an existing large-view-field lens, provides a large-view-field low-distortion lens which is large in view field angle, small in distortion and good in imagingquality, and has high ground and space environment adaptability. The lens comprises a second negative lens, a third negative lens, a fourth negative lens, a fifth positive lens, a sixth positive lens, a seventh cemented lens group, an eighth positive lens and a ninth cemented lens group which are sequentially and coaxially arranged in the incident direction of light. The second negative lens andthe third negative lens form a reverse telephoto lens group, the fourth negative lens and the fifth positive lens form the front half part of the improved double-Gaussian lens group, the sixth positive lens and the seventh cemented lens group form the rear half part of the improved double-Gaussian lens group, and the eighth positive lens and the ninth cemented lens group form an emergent lens group. The fourth negative lens adopts an aspheric lens.

Description

technical field [0001] The invention relates to a fixed-focus lens, in particular to a large-field-of-view low-distortion lens, which can be applied to space and ground imaging. Background technique [0002] For large field of view lenses, whether they are used in space or on the ground, the main problems are large distortion and serious stray halos. When they are used in surveillance scenes, they are not easy to observe. If post-correction is performed, it will Lost some field of view. [0003] In addition, with the development of space exploration, the demand for optical imaging lenses suitable for space exploration is increasing, and the types are also increasing. At present, there are two main problems with large field of view lenses used in space: [0004] First, it is difficult to design the heat dissipation difference and the influence of the vacuum environment. Due to the complex space environment, compared with the ground environment, there is not only a large te...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of large distortion and serious stray halo in the existing large field of view lens, and provide a large field of view low distortion lens with large field of view, small distortion and good imaging quality, which has High ground and space environment adaptability

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