Free-form surface off-axis three-mirror optical system

Abstract

The invention relates to a free-form surface off-axis three-mirror optical system. The system comprises a diaphragm, a primary reflector, a secondary reflector, a third reflector and a detector. The primary reflector is used for reflecting the light of an object space so as to form a first reflected light. The secondary reflector is used for performing the secondary reflection of the first reflected light so as to form a second reflected light. The third reflector is used for reflecting the second reflected light again so as to form a third reflected light. The detector is used for receiving the third reflected light and then imaging. The reflecting surfaces of the primary reflector, the secondary reflector and the third reflector are respectively a five-degree polynomial free-form surface. The reflecting surface of the primary reflector and the reflecting surface of the third reflector are described by the same free-form surface equation. The light path of the first reflected light and the light path of the second reflected light are overlapped with the light path of the third reflected light.

Description

technical field [0001] The invention relates to the field of optical system design, in particular to a free-form surface off-axis three-mirror optical system with compact structure and small volume. Background technique [0002] The off-axis three-mirror optical system is a common off-axis reflective imaging system. Applying the free-form surface to the off-axis three-mirror system can greatly reduce the aberration of the system, improve the image quality of the system, and obtain higher system parameters at the same time, which is of great significance. [0003] The existing free-form surface off-axis three-mirror optical system processes the main reflector and the third reflector on the same component, and the main reflector and the third reflector share the same surface equation, reducing the installation and adjustment of the system. Difficulty, processing difficulty of the system and detection cost of the system. However, in the existing off-axis three-mirror optical ...

AI Technical Summary

Problems solved by technology

However, in the existing off-axis three-mirror optical system with free-form surfaces, although the main reflector and the third reflector are on the same element, they are far apart on the element, so that the volume of the system is large and the structure is not good. Compact; in addition, due to the large volume of the entire main mirror-third mirror element, the edge sagittal height of the curved surface is too large, which is not conducive to processing and inspection

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