Optical compensation zoom lens

Abstract

An optical compensation zoom lens comprises a compensating lens group and a zoom lens group. Focus variation of the whole lens is adjusted by changing relative positions of the compensating lens group and the zoom lens assembly. The compensating lens group comprises a convex-concave negative light focal power lens serving as a first lens, a double-concave negative light focal lens serving as a second lens and a double-convex positive light focal lens serving as a third lens, wherein the first lens, the second lens and the third lens are arranged on one side of an object. The zoom lens group comprises a double-convex negative light focal power lens serving as a fourth lens, a concave-concave negative light focal lens serving as a fifth lens and a double-convex positive light focal lens serving as a sixth lens, a concave-concave negative light focal lens serving as a seventh lens, a double-convex positive light focal lens serving as a eighth lens, a concave-concave negative light focal lens serving as a ninth lens, wherein the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged on one side of the object. The optical compensation zoom lens achieves con-focus of visible light imaging and infrared light imaging through the structures of the lens and parameter setting.

Description

technical field [0001] The invention belongs to the field of optoelectronic integration and relates to an optical compensation zoom lens. Background technique [0002] With the continuous improvement of security awareness and automation, night monitoring is becoming more and more important. Ordinary surveillance lenses are mainly designed for daytime visible light conditions, and people can meet the requirements as long as they can see the surveillance target under visible light conditions. However, in some monitoring occasions, only infrared light invisible to human eyes can be equipped at night. Since infrared light and visible light have different wavelengths, and ordinary lenses are not designed with infrared light in mind, the image plane positions they image will have Migration, infrared defocus, the phenomenon shown is that the image is blurred and the image quality is poor under the infrared light condition. In addition, due to the large temperature difference betw...

AI Technical Summary

Problems solved by technology

However, in some monitoring occasions, only infrared light invisible to human eyes can be equipped at night. Since infrared light and visible light have different wavelengths, and ordinary lenses are not designed with infrared light in mind, the image plane positions they image will have Offset, infrared defocus, the phenomenon shown is that the image is blurred and the image quality is poor under the infrared light condition

In addition, due to the large temperature difference between day and night, ordinary lenses are prone to changes in refractive index due to temperature changes, resulting in imaging shifts

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