Long-wave refrigeration continuous zoom lens with large zoom ratio

Abstract

The invention discloses a long-wave refrigeration continuous zoom lens with a large zoom ratio, and the zoom lens sequentially comprises five groups of lenses from an object side to an image side, and the five groups of lenses comprise a front fixed group with positive focal power, a zoom group with negative focal power, a compensation group with positive focal power, a rear fixed group with negative focal power, and a secondary imaging group with positive focal power. The zoom ratio of the zoom lens provided by the invention is large, the zoom ratio can reach 14, the motion load is small, and the zoom lens group and the compensation lens group can axially move to realize continuous zooming. The lens is compact in structure, meets 100% cold diaphragm efficiency and is high in imaging quality, the maximum field angle reaches 28.5 degrees, the working wave band of the lens ranges from 10 micrometers to 11 micrometers, the focal length of the lens ranges from 20 mm to 280 mm, the F number is always kept to be 2 in the zooming process, and the lens can be used in cooperation with a long-wave infrared refrigeration detector with the resolution of 640 * 512 and the pixel size of 25 micrometers.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a long-wave cooling continuous zoom lens with a large zoom ratio. Background technique [0002] With the rapid development of modern optical technology, infrared technology has gradually matured and has been widely used in national security and social life. Generally speaking, the spatial resolution of the long focal length optical system is higher, but the field of view is narrower, and the spatial resolution of the short focal length optical system is lower, but the field of view is wider. In the process of using the optical system, a wide field of view is required when aiming at the target search and high spatial resolution system, so the optical system must often switch back and forth between different focal lengths, thus a continuous zoom infrared optical system appears. Choose the corresponding focal length for different usage scenarios to achieve the best usa...

AI Technical Summary

Problems solved by technology

The field of view and zoom ratio of the long-wave infrared zoom lens disclosed in the prior art are relatively small, and the detection ability of long-distance targets is relatively weak. Therefore, it is necessary to develop a long-wave continuous zoom lens with a large zoom ratio.

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