A mid-wave infrared optical system

An infrared optical system and medium-wave technology, applied in the field of infrared optical systems, can solve problems such as failure of aberration balance optimization design, poor image quality, difficult control of cold reflection, etc., and achieve good aberration correction, fast zoom time, and good control Effect

CN107121764BActive Publication Date: 2019-05-31HUBEI JIUZHIYANG INFRARED SYST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-05-31

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Abstract

The invention discloses a medium-wave infrared optical system, which includes a double-aperture objective lens group, a zoom group, a focusing lens group, a mirror group and a secondary imaging rear group; The main objective lens group lens two, the short-focus main objective lens group lens one, the short-focus main objective lens group lens two, the short-focus refracting mirror and the short-focus fixed lens; magnification mirror, short-focus zoom lens, medium-focus zoom lens 1, and medium-focus zoom lens 2; the focus mirror group is a focus mirror that can move back and forth; The optical path is folded by 180° and composed of mirror one and mirror two; the secondary imaging rear group is composed of rear group lens one, rear group lens two and rear group lens three. The optical system adopts dual-aperture design technology to realize three variable focal lengths of 18 / 62.5 / 250mm, and the short-focus horizontal field of view reaches 30°, which expands the observation range of the equipment.
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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...

Examples

Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0027] refer to figure 1 As shown, the present invention discloses a mid-wave infrared optical system with dual-aperture and three-speed zoom. The device installed sequentially from the object side to the image side includes a dual-aperture objective lens group, a zoom group, a focusing lens group, a mirror group and a secondary imaging rear group.

[0028] Described double-aperture objective lens group is made of main objective lens group lens one 1, main objective lens group lens two 2, short-focus main objective lens group lens one 3, short-focus main objective lens group lens two 4, short-focus refracting mirror 5 and short-focus Composed of 6 fixed lenses, the main objective lens group of short focus, long focus and medium focus is not shared, and is divided into two apertures.

[0029] Described zoom group is made up of short-focus zooming mirror 7, s...