5-megapixel high-definition surveillance lens with large aperture for day and night use

Abstract

The invention discloses a large-aperture day and night dual-purpose five-megapixel high-definition monitoring camera. A first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens are sequentially arranged from an object side. The large-aperture day and night dual-purpose five-megapixel high-definition monitoring camera disclosed by the invention adopts 11 groups of 11 lens structures in which focal power is sequentially negative, negative, positive, negative, negative, positive, positive, positive and negative, the fifthlens and the seventh lens are balsaming lenses, by properly distributing the focal power, the chromatic aberration and the spherical aberration are not only corrected, and the curvature of field is further corrected by the eighth lens and the ninth lens, so that the imaging quality is greatly improved, and high-definition demand can be met even in the case of a large aperture.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a five-megapixel high-definition monitoring lens with a large aperture for day and night use. Background technique [0002] Closed-circuit monitoring television (CCTV for short) system, as a security technology, is playing an increasingly important role in star-rated hotels, office buildings, banks, government agencies and other places, including the current intelligent community that also uses CCTV system as a security and An important means of property management. [0003] With the rapid rise of the security monitoring market in recent years, the optimization and improvement of digital processing and network transmission speed, the quality requirements for security monitoring lenses have been greatly improved, from ordinary monitoring requirements to high-definition identification. From monitoring only during the day to monitoring day and night. [0004] In order to m...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a 5-megapixel high-definition monitoring lens with a large aperture for day and night use, which solves the problem that the near-infrared band is not considered in the general calculation of conventional lenses, and the brightness of nighttime imaging is only improved by increasing the light flux of the lens. , and the aperture of the lens is also larger, it is easy to cause the chromatic aberration and off-axis aberration of the system to become difficult to correct, and the image quality of the large-aperture lens is not good enough

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