High resolution, low distortion day and night fixed focus lens

Abstract

The invention relates to a high-resolution, low-distortion day and night dual-purpose fixed-focus lens. The optical system is provided with a front group A with a negative focal power, a diaphragm C with a positive focal power, and a rear group with a positive focal power in sequence along the incident direction of light. group, the front group A is sequentially provided with a negative crescent lens A-1, a negative crescent lens A-2, a biconcave lens A-3, and a negative crescent lens A-4 and a negative crescent lens A-5. The first cemented group, the rear group B is sequentially provided with a biconcave lens B-1, a second cemented group closely connected by a negative crescent lens B-2 and a negative crescent lens B-3, and a biconvex lens B-4. The lens has the advantages of high resolution, large relative aperture, day and night confocal, and low distortion. It can not only image clearly in daytime lighting environment, but also can image clearly at night with infrared supplementary light in extremely low illumination environment.

Description

technical field [0001] The invention relates to a camera lens device of a monitoring system, in particular to a high-resolution, low-distortion day-night dual-purpose fixed-focus lens. Background technique [0002] With the rapid development of science and technology and the gradual improvement of people's safety awareness, the continuous progress of the security market is being promoted. At present, there are a variety of fixed-focus lenses used in monitoring systems in the market. The emergence and application of small TV monitoring cameras have a history of 20 to 30 years. There are many types of miniature camera lenses with different specifications. matching. Their performance indicators are mixed, most of them are low-end products, and their performance indicators are low. Although some can meet the requirements of high-definition, there are many defects in high-definition and wide-angle monitoring in a small space. , day and night confocal, low distortion and other a...

AI Technical Summary

Problems solved by technology

Their performance indicators are mixed, most of them are low-end products, and their performance indicators are low. Although some can meet the requirements of high-definition, there are many defects in high-definition and wide-angle monitoring in a small space. , day and night confocal, low distortion and other advantages, often require higher cost

Moreover, the adaptive spectral range is narrow, and it can only be used under daytime light conditions of 480nm to 700nm; the image distortion is large, and the difference between the image distortion and the real scene becomes larger, and the authenticity is poor.

Images