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

A technology of illumination and range, applied in the field of optics, can solve the problems of blurred imaging, defocusing of the optical system, small aperture, etc., and achieve the effect of simple assembly and debugging, compact structure, and realization of adiabatic difference

CN112269238AActive Publication Date: 2021-01-26LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2021-01-26

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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.
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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...

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Embodiment Construction

[0032] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0033] The technical scheme of the present invention: the front group 1, the variable diaphragm 2, the rear group 3, the parallel plate 4 and the image plane 5 are sequentially arranged along the light incident direction; the front group 1 includes the first The cemented group 11, the first single lens 12, the second single lens 13 and the second second cemented group 14; the rear group 3 includes a third cemented group 31 and a fourth cemented group 32 arranged in sequence along the light incident direction.

[0034] The lens works in the 400-1000nm band range and has an optical athermalization effect. The iris diaphragm 2 can realize the continuous adjustment of the F / # of the optical system from 1 to 16, and is suitable for a wide illumination range of 10 -3 lx to 10 5 lx.

[0035] The first cemented group 11 is cemented by the first meniscus negative lens 1...