Medium wave infrared optical system

Abstract

The invention discloses a medium wave infrared optical system which comprises a double aperture objective lens group, a zoom group, a focusing lens group, a mirror group and a secondary imaging rear group. The double aperture objective lens group comprises a first main objective lens group lens, a second main objective lens group lens, a first short focus main objective lens group lens, a second short focus main objective lens group lens, a short focus reversing mirror and a short focus fixed lens. The zoom group is composed of a short focus zoom mirror which can rotate about a rotation center, a short focus zoom lens, a first middle focus zoom lens and a second middle focus zoom lens. The focusing lens group is a focusing lens which can move back and forth. The mirror group is composed of first and second mirrors can fold an optical path by 180 degrees. The secondary imaging rear group is composed of a first rear group lens, a second rear group lens and a third rear group lens. The optical system uses a double-aperture design technology to realize third gear variable focal length of 18 / 62.5 / 250mm. The short focus horizontal view field is up to 30 degrees, which expands the equipment observation range.

Description

technical field [0001] The invention relates to an infrared optical system, in particular to a mid-wave infrared optical system with double-aperture and three-speed zoom. Background technique [0002] In recent years, with the rapid development of infrared optical technology and the continuous expansion of its application range, the demand for infrared zoom optical system is increasing day by day. The infrared zoom optical system can change the focal length within a certain range, and the image plane is stable and maintains good image quality at each focal length position, so that the size of the scene on the image plane can be changed, and a good visual effect that cannot be achieved by a fixed-focus lens can be produced. , can achieve the purpose of searching for targets with a large field of view and carefully observing targets with a small field of view, and has a wide range of applications in military and civilian fields. [0003] The requirement of photoelectric equip...

AI Technical Summary

Problems solved by technology

In the cooled infrared zoom optical system, if the focal length of the short focus (large field of view) is too short, the angle of light deflection on the first two lenses will be very small, making it difficult to control the cold reflection. Often lead to poor image quality, aberration balance optimization design failure

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