Light low-light-level night vision lens

Abstract

The invention relates to a light low-light-level night vision lens which has a smaller F number compared with an existing low-light-level night vision lens, and the light gathering capacity is improved. The lens is characterized by comprising a front lens group A, a diaphragm B and a rear lens group C which are sequentially arranged along the incident direction of an optical axis. The front lens group A comprises a positive meniscus lens A1, a biconcave lens A2, a negative meniscus lens A3 and a positive meniscus lens A4, wherein the biconcave lens A2 and the negative meniscus lens A3 are tightly connected to form a first doublet lens; and the rear lens group C comprises a biconvex lens C1, a biconvex lens C2, a biconcave lens C3 and a negative meniscus lens C4, wherein the biconvex lens C1 and the biconcave lens C2 are tightly connected to form a second doublet lens. The lens is reasonable in design, the F number of the lens is 1.1, and the lens has high light gathering capacity; thenumber of optical lenses is reduced, the total length of the lens is shortened, and the light weight of the lens is realized; the lens is suitable for low-illumination environments such as night and the like, and has good detection capability.

Description

technical field [0001] The invention relates to the design of an optical lens, in particular to a lightweight low-light night vision lens. Background technique [0002] The low-light lens has the characteristics of large aperture and strong light-gathering ability. With the high-sensitivity low-light camera, it has good target detection ability even in low-light environments such as night. It is widely used in military, criminal investigation, security and other fields. Incomparable advantages. The low-light lens does not need to use auxiliary light sources, so the overall structure of the lens is simpler than that of ordinary camera lenses, but its large aperture performance requirements greatly increase the design difficulty. The F-number of existing low-light lenses is usually 1.2. Facing the performance requirements of larger apertures, in order to well correct various aberrations caused by large apertures, more optical lens combinations are required, which is not condu...

AI Technical Summary

Problems solved by technology

[0003] In view of the deficiencies in the prior art, the present invention provides a light-weight low-light night vision lens, whi

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