Medium wave infrared optical system

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

CN107121764AActive Publication Date: 2017-09-01HUBEI JIUZHIYANG INFRARED SYST CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-09-01

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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.
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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...