Compact continuous zooming infrared optical system

Abstract

The present invention belongs to the technical field of optical design, and especially relates to a compact continuous zooming infrared optical system. The system comprises a front fixing set, a zooming set, a compensation set, a rear fixing set and a secondary imaging mirror set. Light emitted by an object side target is subjected to imaging to a virtual image point P1 through the front fixing set, the P1 is an object point of the zooming set, and an object distance is L1; the P1 is subjected to imaging to an image point P2 through the zooming set, an image distance is L2, the P2 is an objectpoint of the compensation set, and an object distance is L4; the P2 is subjected to imaging to an image point P3 through the compensation set, an image distance is L3, the P3 is an object point of the rear fixing set and is finally subjected to imaging onto a primary phase surface; the object distance L1 is changed through movement of the zooming set so as to influence the position of the P2, theobject distance L4 is changed through movement of the compensation set to finally remain the P3 unchanged so as to remain the position of the primary phase surface unchanged, zooming is achieved on the premise without changing the phase surface position, and the secondary imaging mirror set is employed to performing imaging of the primary phase surface on a focal plane of the detector. The demands of a mini-type infrared zooming system with a high zooming ratio and high performances can be met.

Description

technical field [0001] The invention belongs to the technical field of optical design, and in particular relates to a compact continuous zoom infrared optical system. Background technique [0002] The continuous zoom system can maintain the continuity of the image during the conversion of the field of view, the target image can always be kept clear, and the target will not be lost when the magnification is changed. It is the best choice for the imaging system to solve the resolution of large field of view and small field of view. It has broad application prospects in the fields of search, tracking and reconnaissance. [0003] The continuous zoom system needs to meet the two conditions of continuous variable focal length and stable image plane position. According to different compensation methods, it can be divided into optical compensation and mechanical compensation. The zoom group of the optical compensation zoom system must be moved to some special positions in order to ...

AI Technical Summary

Problems solved by technology

The mechanically compensated continuous zoom system achieves magnification through the movement of movable components in the optical path. To achieve a large zoom ratio, there must be enough movement space, which makes the continuous zoom system often have the disadvantages of large volume and complex structure. , it is difficult to meet the current demand for equipment miniaturization

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