Day and night dual-purpose athermalization lens with wide illumination range

Abstract

The invention relates to a day and night athermalization lens with a wide illumination range, and belongs to the technical field of optics. An optical system of the lens is sequentially and coaxiallyprovided with a front group [1], an iris diaphragm [2], a rear group [3], a parallel flat plate [4] and an image plane [5] in the light incident direction, wherein the front group [1] comprises a first cemented group [11], a first single lens [12], a second single lens [13] and a second cemented group [14] which are sequentially arranged along the light incident direction; and the rear group [3] comprises a third cemented group [31] and a fourth cemented group [32] which are sequentially arranged along the light incident direction. The optical system of the lens uses common optical glass, achieves the purpose of achromatism by optimizing the material of the optical system and using doublet cemented lens, and introduces two high-order aspheric surfaces to realize large relative aperture andlarge image surface aberration correction. The lens has the characteristics of compact structure, large aperture, athermalization and 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-purpose athermalization lens with a wide illumination range. Background technique [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; Dual use is not effective. [0003] Usually the human eye is only sensitive to the visible light band. In dark environments such as night, the night radiation includes not only visible light but also near-infrared radiation. The camera lens needs to be in a wider spectral range to match the night sky radiation spectrum and the CCD respon...

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

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