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Three-group linkage compact type high-zoom-ratio infrared continuous zooming optical system

An optical system and zoom ratio technology, applied in the field of infrared optical systems, can solve problems such as difficult to meet the actual use requirements of high zoom ratio and small size

Active Publication Date: 2017-03-22
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Difficult to meet the actual use needs of high zoom ratio and small size

Method used

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  • Three-group linkage compact type high-zoom-ratio infrared continuous zooming optical system
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  • Three-group linkage compact type high-zoom-ratio infrared continuous zooming optical system

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Embodiment Construction

[0025] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0026] The zoom optical system is composed of five groups of lenses: the front fixed group, the zoom group, the first compensation group, the second compensation group and the rear fixed group. The core of the zoom system is the change of the magnification of the movable lens group. By adopting aspherical and diffractive surfaces in the design, advanced aberrations, on-axis point and off-axis point aberrations, thin beam and wide beam aberrations, and various chromatic aberrations are reduced, and obtained in the full field of view, full aperture, and full zoom range satisfactory image quality.

[0027] The front fixed group is the objective lens 1, the variable power group is the variable power lens 2, the first compensation group is the first compensation lens 3, the second compensation group is the second compensation lens 4, and the rear fixed group is the co...

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Abstract

The invention relates to a three-group linkage compact type high-zoom-ratio infrared continuous zooming optical system, adopts a double-compensation group design method to realize three-group linkage of a zooming group and compensation groups, realizes a large zoom ratio, and through adoption of aspheric surfaces and diffractive surfaces, high-grade aberrations, point-on-axis and off-axis point aberrations, beamlet and wide light beam aberrations and various aberration are reduced and axial space is compressed, and satisfying image quality is obtained in a full field of view and a full aperture. The advantages are that 30-time optical continuous zooming and continuously variable focal length are realized, continuously enlarged and reduced images can be obtained, and the image plane position is kept stable, and image quality is kept good in a zooming process. The axial length of the whole optical system is small, is only 180mm, and is reduced by nearly 60% than the length of an optical system of the same kind. By adoption of aspheric surface and diffractive surface design, the designed degree of freedom of the continuous zooming optical system is increased, optimization design is performed on the optical system, and optional variables are increased, so that optical system aberration design is easy to achieve an excellent result, and thus excellent image quality is obtained.

Description

technical field [0001] The invention belongs to an infrared optical system, and relates to a three-group linkage compact high-magnification ratio infrared continuous zoom optical system, which is applied to the military and civilian dual-use field. Background technique [0002] The infrared continuous zoom thermal imager is an imaging system whose focal length can be changed continuously, while the position of the image plane remains stable and the image quality remains good during the zooming process. In order to obtain images of different sizes on the image plane of a fixed-focus infrared camera, the distance between the target object and the lens must be changed or a lens with a different focal length must be replaced. The infrared continuous zoom thermal imager can continuously change the focal length of the system. Therefore, it can obtain target images of continuously changing sizes on the image plane, which is very beneficial for photoelectric detection, reconnaissanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/15
CPCG02B15/15
Inventor 张良兰卫华赵菲菲潘晓东
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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