Large-aperture large-target-surface low-light imaging lens

Abstract

The invention relates to a large-aperture large-target-surface low-light imaging lens. In an optical system of the lens, a front lens group A, a variable diaphragm B and a rear lens group C are arranged successively from left to right along the light incident direction; the front lens group A comprises a negative crescent-shaped lens A1, a positive crescent-shaped lens A2, a first gluing group formed by closely connecting a plano-convex lens A3 with a double-concave lens A4, and a double-convex lens A5 arranged successively from left to right; and the rear lens group C comprises a negative crescent-shaped lens C1, a second gluing group formed by closely connecting a double-convex lens C2 with a double-concave lens C3, a double-convex lens C4 and a plano-convex lens C5 arranged successivelyfrom left to right. The lens uses 10 spherical lenses, F1.0 large-aperture large-target-surface clear imaging is realized, and the detection capability of the lens under a weak illumination conditionis improved effectively; and at the same time, the lens is compact in structure, small in size and low in weight.

Description

Technical field: [0001] The invention belongs to the field of optoelectronic technology, in particular to a low-light imaging lens with large aperture and large target surface. Background technique: [0002] In an environment with good lighting conditions, it is easy to obtain a satisfactory imaging picture with an ordinary camera lens, but when used in low-light conditions such as night and low light, it is necessary to add auxiliary light sources such as infrared fill light and flash, which will not only make the system The overall structure becomes larger, and the definition of the imaging picture decreases, and the details of the picture are easily lost. The low-light lens has strong light-collecting and light-transmitting capabilities, and when used with a high-sensitivity imaging chip, it can achieve bright and clear imaging effects under weak light conditions. The main feature of the low-light lens is that it has a large aperture, allowing more light to enter the sys...

AI Technical Summary

Problems solved by technology

The existing low-light lenses have low resolution, large volume, small target surface, and use of aspheric surfaces, which lead to high costs, and there is still a lot of room for improvement in the overall performance of the lens.

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