An infrared dual-field-of-view fast-switching lens

Abstract

The invention discloses an infrared dual-field fast switching lens, which comprises a base plate, a front fixed lens group, a flip mirror group, a rear fixed mirror group, an uncooled infrared core, an eyepiece assembly, a sheave mechanism, a bevel gear group and a drive components. The flip mirror group and the sheave mechanism are connected to the mounting base through the connecting shaft, and the mounting base is fixed on the bottom plate; the bevel gear set is composed of two intermeshing bevel gear I and bevel gear II, and the bevel gear I is connected through the connecting shaft Fixed at the end of the sheave mechanism, the bevel gear II is installed at the end of the drive assembly through the transmission shaft, the drive assembly is fixed on the bottom plate, and the drive assembly drives the sheave mechanism to run through the bevel gear set. The invention utilizes the groove wheel mechanism to drive the reversing mirror group to realize reversing in the range of 0-90°, has short switching time, strong self-locking function, can resist violent external vibrations, and has high reliability in use.

Description

technical field [0001] The invention relates to the field of optics, in particular to an infrared dual-field fast switching lens. Background technique [0002] The infrared dual-field optical system is an infrared optical system that integrates the advantages of infrared technology and zoom optical system. Because it has the characteristics of high transmittance, low cost, and can realize the conversion of field of view, it is widely used in remote sensing, early warning, and reconnaissance. , infrared imaging guidance and other fields have a wide range of applications. Due to the needs of the application, the infrared dual-field of view optical system generally has two fields of view, one large and one small. The large field of view is used to search for suspicious targets in a large space, and the small field of view is used to identify, track or aim. [0003] The current infrared dual-field optical lenses are mainly divided into two categories: the first category is the...

AI Technical Summary

Problems solved by technology

[0003] The current infrared dual-field optical lenses are mainly divided into two categories: the first category is the axial movement type, that is, the focal length of the optical system is changed by changing the axial distance of the lens group. The disadvantage is that the axial size is large and the mechanical structure Complicated, low stability accuracy, long zooming time, difficult processing and assembly, which increases production costs, and difficult to control focal length accuracy after zooming

The second type is the switching type, that is, the focal length of the optical system is changed by switching the lens group in the optical system. The characteristic of this type of optical system is that there is no moving optical element in the small field of view optical path, and the optical axis of the optical system has good stability. The switching time of the system is short and the transmittance is high; however, in order to ensure the stability of the optical axis, the lens needs to be equipped with a corresponding locking mechanism after switching, because the number of electronic components used is large, the volume is large, and the cost is high; Therefore, in some special application scenarios, the dual-field infrared thermal imager cannot be equipped with the function of quickly switching the field of view.

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