3mm focal length ultra-wide field fisheye lens optical system

Abstract

The invention discloses a 3mm focal length ultra-wide field fisheye lens optical system, comprising a front lens group, a diaphragm, a rear lens group and an image plane, which are arranged in order from front to back along a light incidence direction, wherein the front lens group is sequentially provided with a first lens and a second lens from front to back, and the rear lens group is sequentially provided with a third lens, a fourth lens, a fifth lens and a sixth lens from front to back; the optical system disclosed by the invention is only composed of 6 lenses, and has the advantages of relative large apertur, high resolution, and simple and compact structure, the chromatic aberration of a purple boundary spectrum of 435nm is better corrected, a purple boundary effect is eliminated, and the 3mm focal length ultra-wide field fisheye lens optical system is suitable for ultra-wide field imaging under a local strong light source, and can conveniently obtain images with high definition,strong light boundary and without purple boundary interference.

Description

technical field [0001] The invention relates to the technical field of optical systems, and more specifically relates to an ultra-wide-angle fisheye lens optical system with a focal length of 3mm. Background technique [0002] The fisheye lens optical system is widely used in security, monitoring and other fields because it has a field of view approaching or exceeding 180° and can obtain a super wide range of scene imaging. The existing fisheye lens optical systems used in security, monitoring and other fields are mainly based on small pixel detectors, using short focal length optical systems, which have insufficient detection ability in dark field environments, and the clear imaging of the scene is not high. In addition, in the presence of local bright light sources, the optical system cannot correct the chromatic aberration of the 435nm spectrum well, and there will be obvious purple fringing effect when imaging the scene, resulting in poor image quality, and it is impossi...

AI Technical Summary

Problems solved by technology

The existing fisheye lens optical systems used in security, monitoring and other fields are mainly based on small pixel detectors, using short focal length optical systems, which have insufficient detection ability in dark field environments, and the clear imaging of the scene is not high

In addition, in the presence of local bright light sources, the optical system cannot correct the chromatic aberration of the 435nm spectrum well, and there will be obvious purple fringing effect when imaging the scene, resulting in poor image quality, and it is impossible to distinguish the junction of bright and dark scenes

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