U-shaped folded medium wave infrared 30-times continuous zooming optical system

Abstract

The invention discloses a U-shaped folded medium wave infrared 30-times continuous zooming optical system, which sequentially consists of a front fixed set, a zooming set, a compensation set, a rear fixed set, a first reflector, a secondary imaging set, a second reflector and a ternary imaging set from an object side to an image side. The system has a structure of which focal power distribution is sequentially positive, negative, positive, negative, positive and positive. The two-component zooming principle and the ternary imaging technology are adopted in the system, the focal length is continuously variable in a range of 23 to 701 millimeters, the travel of the zooming set is 194 millimeters, the travel of the compensation set is 39 millimeters, 30-times continuous zooming is realized, the optical total length of the system is only 559 millimeters, the ratio of the total length to the focal length is 0.79, the overall shape size of the system is 345mm*176mm*224mm (length*width*height), the F value of the optical system is 4 and constant, and the system has the advantages of large zooming ratio, low optical total length, smooth overall zooming locus and excellent imaging quality in the whole focal length range.

Description

technical field [0001] The invention belongs to the technical field of optics, in particular to a U-shaped folded mid-wave infrared 30-fold continuous zoom optical system applied to a medium-wave refrigeration infrared focal plane detector. Background technique [0002] The infrared zoom imaging system is divided into two types: continuous zoom and fixed zoom. The continuous zoom infrared optical system is used in the airborne photoelectric reconnaissance system, which can not only provide the pilot with the best situational understanding when cruising and searching, but also find the target. , adjust to small field of view to aim and track. [0003] At present, domestic research on the continuous zoom optical system of medium wave infrared has been reported in the literature, such as: Xu Zhaodong "Design of Airborne High Resolution Continuous Zoom Infrared Thermal Imager", designed a medium wave 640×512 element infrared focal plane detector. A set of 1:20 small high-resolu...

AI Technical Summary

Problems solved by technology

Although the patented "three-element mid-wave infrared 30x continuous zoom optical system" is the same as 30x, but through the three-element zoom, the system needs three motors to drive, and the third group is two lenses, which increases the The burden of the motor affects the accuracy, increases the difficulty of assembly and adjustment, and increases the production cost

Although the patented "ultra-short medium-wave infrared 30 times continuous zoom optical system" is a two-element zoom, its focal length is short, and the system is a straight barrel type, and the structure is not compact enough. The zoom group of the system is two lenses. The compensation group is three lenses, which undoubtedly increases the burden on the motor

"Topaz-A novel design of a high magnification, athermalized 1:30 zoomin the MWIR" (SPIE, Bellingham, WA, 2004), this article also introduces a three-element zoom, the zoom ratio is 1:30 The mid-wave infrared optical system has a small F-number of 4.7, and the three-component element needs three motors, which increases the burden on the motors, affects the accuracy, and increases the difficulty of assembly and adjustment.

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