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A mid-wave infrared continuous zoom optical system with long focal length and high zoom ratio

An optical system and zoom ratio technology, applied in optics, optical components, instruments, etc., can solve the problems of long travel of the compensation lens group, low system transmittance, small zoom ratio, etc., and achieve a compact optical-mechanical system structure. , the effect of high resolution and short zooming stroke

Active Publication Date: 2022-03-01
苏州东方克洛托光电技术有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above medium-wave continuous zoom infrared systems all have problems such as long focal length but small zoom ratio or high zoom ratio but short focal length, low transmittance due to too many lenses, and long travel distance of zoom and compensation lens groups.

Method used

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  • A mid-wave infrared continuous zoom optical system with long focal length and high zoom ratio
  • A mid-wave infrared continuous zoom optical system with long focal length and high zoom ratio
  • A mid-wave infrared continuous zoom optical system with long focal length and high zoom ratio

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Effect test

Embodiment 1

[0030] The long focal length and high zoom ratio mid-wave infrared continuous zoom optical system of the present invention has a focal length of 32 mm to 650 mm, an F number of 4, a design wavelength of 3 μm to 5 μm, and a lens combination of silicon and germanium materials to realize the achromatic design of the optical system.

[0031] Such as image 3 and Figure 4 As shown, the long focal length and high zoom ratio mid-wave infrared continuous zoom optical system of the present invention consists of a front fixed group 1, a first compensation group 2, a zoom group 3, a second compensation group 4, and a rear fixed group arranged in sequence along the optical axis. It consists of a fixed group 5 and a cooling detector 6; each optical surface is coated with a high-transmittance film layer. Among them, the front fixed group 1 is composed of a beam expander lens group 11 and a condenser lens 12, and the beam expander lens group 11 is composed of a first lens 111 with a positi...

Embodiment 2

[0050] The difference between this embodiment and Embodiment 1 is that the front fixing group 1 only uses one condenser lens 12 . When the beam expander lens group 11 is removed, the focal length of the remaining optical system becomes shorter, the focal length ranges from 16 mm to 325 mm, and the zoom ratio remains unchanged. It can be used in occasions requiring short focal length and large field of view.

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Abstract

The invention relates to a medium-wave infrared continuous zoom optical system with long focal length and high zoom ratio. The zoom group of optical power, the second compensation group with positive optical power, the rear fixed group with positive optical power; the cooling detector; the first compensation group, the zoom group, and the second compensation group can be operated separately along the optical axis Non-linear movement back and forth realizes continuous change of focal length. The present invention adopts the design scheme of negative group zoom combined with negative group compensation and compensation before zooming to realize miniaturized design of optical system with long focal length and high zoom ratio. The number of lenses is small, the transmittance is high, and the optical-mechanical structure is compact.

Description

technical field [0001] The invention belongs to the technical field of zoom optical imaging systems, in particular to a continuous zoom cooling type mid-wave infrared optical imaging system with compact structure, large diameter and high zoom ratio. Background technique [0002] The zoom optical system can realize tracking and imaging of target objects at different distances or in the observation field of view, and can effectively improve the detection and recognition probability of targets. There are two forms of zoom structure: step zoom and continuous zoom. Most of the infrared zoom optical systems in the public literature are in the form of step-by-step zooming. This structure has the problem of discontinuous field of view during the zooming process, which is easy to cause loss of targets. The mid-wave infrared zoom optical system with long focal length and small F number mostly adopts the structural form of cooled detector combined with secondary imaging to reduce the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/173
CPCG02B15/173
Inventor 孙金霞韩希珍曲锋
Owner 苏州东方克洛托光电技术有限公司
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