An ultra-long focal length infrared multi-field optical system

Abstract

The invention relates to an ultra-long focal length infrared multi-field optical path system, in which a small field of view optical path is composed of a front group objective lens, a focusing lens group, a first fixed reflector, a second fixed reflector, a converging lens group and a detector; The field lens group cuts into the small field of view optical path between the front objective lens and the focusing lens group to form a medium field of view optical path; the motor drives the large field of view lens group to cut into the small field of view optical path between the front objective lens and the focusing lens group to form a large field of view optical path The ultra-small field of view optical path is formed between the first fixed reflector and the second fixed reflector driven by the motor to cut into the small field of view optical path. The advantage is that the conversion of infrared multi-fields of view is realized by using the method of cutting into different zoom lens groups. This method can ensure that each field of view has high optical axis precision, and at the same time ensure that each field of view has high optical transmittance, and The field of view switching mechanism is simple, with high accuracy and easy control.

Description

technical field [0001] The invention belongs to infrared optical path technology, and relates to an ultra-long focal length infrared multi-field optical path system. Background technique [0002] For photoelectric detection systems, depending on the requirements, infrared imaging systems usually require small, medium and large fields of view for target recognition, detection, auxiliary navigation and large-scale search functions. [0003] The configurations of infrared multi-field optical systems at home and abroad are mainly double-field and three-field optical systems. Among them, the field of view switching methods are divided into cut-in mode and axial movement mode. The cut-in method realizes the conversion of the field of view by switching between different zoom lens groups. The advantage of this method is that the small field of view has the highest optical axis accuracy and the highest optical transmittance. The disadvantage is that the optical transmittance of the ...

AI Technical Summary

Problems solved by technology

The disadvantage is that due to the way of axial movement, all optical components are shared by multiple fields of view, resulting in low transmittance of the entire optical system and low positioning accuracy of the optical axis and field of view

[0004] With the continuous deepening and expansion of applications, it is necessary to identify and recognize the target, which requires the optical system to have higher resolution and more optical fields of view. The current three-field optical system can no longer meet the actual requirements of the system. According to the requirements of use, it is necessary to expand the three-field optical system to increase the ultra-small optical field of view with ultra-long focal length

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