2.2mm ultra wide-angle day and night confocal lens and manufacturing method thereof

Abstract

The invention relates to a 2.2mm ultra wide-angle day and night confocal lens and a manufacturing method thereof. The lens comprises a cylindrical housing, the housing is internally successively provided with a front group forming negative focal power and a rear group forming positive focal power along the incoming direction of light, a diaphragm is arranged between the front group and the rear group, the front group comprises a first concave lens, a second concave lens and a first double-convex lens, and the rear group comprises a second double-convex lens and a doublet film. According to the invention, the lens can image clearly in a daytime illumination environment and can also image clearly through infrared light supplement in a night extremely low-illumination environment.

Description

technical field [0001] The invention relates to a 2.2mm super wide-angle day and night confocal lens and a manufacturing method thereof. Background technique [0002] In the early days, there were a variety of fixed-focus lenses with large field of view used in security systems. However, because many products were difficult to correct the purple fringe and field curvature at the edge, the imaging results were not satisfactory, so that the use of more Multiple lenses are used to achieve a more perfect effect, which greatly increases the product cost. At present, in the security industry, there are few ultra-wide-angle fixed-focus lenses with low cost and high image quality in the true sense. Contents of the invention [0003] The present invention makes improvements to the problems existing in the above-mentioned prior art, that is, the technical problem to be solved by the present invention is to provide a 2.2mm ultra-wide-angle day and night confocal lens and its manufac...

AI Technical Summary

Problems solved by technology

[0002] In the early days, there were a variety of fixed-focus lenses with large field of view used in security systems. However, because many products were difficult to correct the purple fringe and field curvature at the edge, the imaging results were not satisfactory, so that the use of more Multiple lenses to achieve a more perfect effect, and thus greatly increase the product cost

At present, in the security industry, there are few ultra-wide-angle fixed-focus lenses with low cost and high image quality in the true sense.

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