A wide illuminance range day and night dual-use athermalized lens

Abstract

The invention relates to a day and night dual-use athermalized lens with a wide illuminance range, belonging to the field of optics technology. The optical system of the lens is sequentially coaxially provided with a front group [1], an iris [2], a rear group [3], a parallel flat plate [4] and an image plane [5] along the light incident direction; The group [1] includes a first cemented group [11], a first single lens [12], a second single lens [13], and a second second cemented group [14] arranged in sequence along the light incident direction; the rear group [3] includes a third gluing group [31] and a fourth gluing group [32] that are sequentially arranged along the light incident direction. The optical system of the lens is made of ordinary optical glass, and the purpose of achromatic is achieved by optimizing the optical system material and using double cemented lenses, and introducing two high-order aspheric surfaces to achieve large relative aperture and large image plane aberration correction; the invention has a structure Features compact, large aperture, athermalization, day and night use.

Description

technical field [0001] The invention belongs to the technical field of optics, and relates to a day and night dual-use athermalized lens with a wide illuminance range. Background technique [0002] In recent years, with the widening range of application of camera lenses, people have higher and higher requirements for the applicable illuminance range of the lens for both day and night use, but the existing lenses generally have the following shortcomings: 1. Narrow, it can only be used in daytime light conditions, in the low illumination environment at night, it needs to pass infrared supplementary light to get clear imaging; 2 The aperture is small, it cannot meet the minimum imaging illumination requirements of the CCD chip under low illumination, and cannot be clearly imaged, day and night The dual-use effect is not good. [0003] Usually the human eye is only sensitive to the visible light band. In dark environments such as night, the night radiation includes near-infrar...

AI Technical Summary

Problems solved by technology

[0002] In recent years, as the application range of camera lenses has become more and more extensive, people have higher and higher requirements for the applicable illumination range of the lens for day and night use, but the existing lenses generally have the following shortcomings: 1. Narrow, it can only be used under daytime light conditions. In the low-light environment at night, it needs to be supplemented by infrared light to image clearly; Not good for dual use

[0004] The use of ordinary optical lenses is easily affected by the surrounding environment, especially the temperature. When environmental factors such as temperature change, many parameters of the optical system, such as surface shape, spacing, thickness, and material refractive index, will change accordingly, which will lead to changes in the optical system. Out of focus, the image is blurred, thus limiting the application of the lens in extreme environments

Images