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Long-wave infrared continuous zoom lens

A zoom lens and long-wave infrared technology, applied in the field of long-wave infrared continuous zoom lens, can solve the problems of limited detection distance, uncorrected chromatic aberration, unsuitable detector, etc., achieve good zoom effect, improve chromatic aberration, and reduce production costs Effect

Inactive Publication Date: 2010-09-29
北京波谱华光科技有限公司
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Problems solved by technology

The system has the following problems: first, its chromatic aberration at the telephoto position has not been corrected, and the image quality is average; second, the system is not suitable for detectors with larger panel numbers; third, the telephoto focal length of the system is only 90mm, the effective detection distance is limited

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Embodiment Construction

[0034] Since the first lens group 110 has only one lens, its structure is relatively simple and easy to manufacture, so the production cost can be effectively reduced. In addition, limiting the value of F0 / F1 between 0.25 and 0.75 can make the entire zoom lens 100 have a good zoom effect, and can make the structure of the zoom lens more compact while maintaining good image quality.

[0035] The second lens group 120 and the third lens group 130 are zoom groups suitable for moving between the first lens group 110 and the fourth lens group 140 . Specifically, when it is desired to adjust the magnification of the zoom lens 100 from the telephoto end to the wide-angle end, the second lens group 120 is moved toward the object side 150, and the third lens group is first moved toward the image 160 side, and then toward the object side 150. At the same time, as the fourth lens group 140 of the focusing group, in order to effectively compensate for the offset of the image plane positio...

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Abstract

The invention discloses a long-wave infrared continuous zoom lens comprising a first lens group with positive diopter, a second lens group with negative diopter, a third lens group with positive diopter and a fourth lens group with positive diopter, wherein the first lens group is a fixed group and is formed by a falcate germanium lens with a convex surface which faces to an object side, and a magnification group which can change a system focus is formed by the second lens group and the third lens group; wherein the second lens group comprises a plano-concave zinc selenide negative lens with a concave surface which faces to the object side and a concavoconcave germanium lens; the third lens group comprises a falcate germanium lens with a concave surface which faces to the object side; thefourth lens group is a focus group which comprises a falcate germanium lens with a concave surface which faces to the object side; the focus of the zoom lens is F, the focus of the first lens group is F1, and the F / F1 is larger than 0.25 and is smaller than 0.75. The long-wave infrared continuous zoom lens has simpler structure, is easy to manufacture and process and can effectively reduce production cost.

Description

technical field [0001] The invention relates to a long-wave infrared lens, in particular to a long-wave infrared continuous zoom lens for an uncooled detector. Background technique [0002] In recent years, the range of applications of infrared technology has flourished. Due to its advantages of low price, small size, light weight, low power consumption, and high reliability, uncooled detectors have been widely used in national defense, public security, industrial detection and other fields. In many special occasions, the infrared fixed-focus lens can no longer meet the needs. One of the core components of this imaging system is the infrared zoom lens, which realizes continuous zooming by moving different lens groups while maintaining a clear image plane. It can achieve the purpose of searching for targets with a large field of view, tracking targets during zooming, and carefully observing targets with a small field of view. It has a good application prospect in civilian a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/16
Inventor 骆守俊张浩
Owner 北京波谱华光科技有限公司
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