Lens system and prime lens

Abstract

The embodiments of the invention disclose a lens system and a prime lens. The lens system comprises a first lens group with positive focal power, an aperture diaphragm, and a second lens group with positive focal power, which are arranged in sequence along the optical axis from the object side to the image side. The first lens group comprises a first lens with negative focal power, a second lens with negative focal power, a first sub-lens group with positive focal power and a second sub-lens group with positive focal power, which are arranged in sequence along the optical axis from the object side to the image side. The second lens group comprises a third sub-lens group with negative focal power and a fourth sub-lens group with positive focal power, which are arranged in sequence along the optical axis from the object side to the image side. In the scheme, under cooperation of the lenses and the lens groups in structure, focal power, focal length and arrangement order, super-high light flux and high resolution above 5 mega pixels can be achieved. Moreover, in a low-light environment, all-weather color video monitoring can be realized without infrared light supplement.

Description

technical field [0001] The invention relates to the field of optical instruments, in particular to a lens system and a fixed-focus lens. Background technique [0002] In the security system, the requirements for the quality of the lens used for monitoring are getting higher and higher, but at present, many lens products have low optical performance indicators, and it is difficult to meet the requirements of large light and high resolution. At present, the resolution of most lenses can only meet the needs of cameras below 3 million pixels, and cannot meet the needs of ultra-high-definition cameras with higher pixels such as 4 million pixels and 5 million pixels. Infrared fill light can clearly image. Contents of the invention [0003] The purpose of the embodiments of the present invention is to provide a lens system and a fixed-focus lens, which are used to realize imaging with a large amount of light, high resolution, and no infrared supplementary light in a low-illumina...

AI Technical Summary

Problems solved by technology

[0002] In the security system, the requirements for the quality of the lens used for monitoring are getting higher and higher, but at present, many lens products have low optical performance indicators, and it is difficult to meet the requirements of large light and high resolution.

At present, the resolution of most lenses can only meet the needs of cameras below 3 million pixels, and cannot meet the needs of ultra-high-definition cameras with higher pixels such as 4 million pixels and 5 million pixels. Infrared fill light for clear imaging

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