Freeform Surface Imaging Optical System

Abstract

The invention discloses a free-form surface imaging optical system. The free-form surface imaging optical system comprises a first reflector, a second reflector, a third reflector, a fourth reflector, an aperture diaphragm and a detector. A target is irradiated on the second reflector after being reflected by the first reflector, is irradiated on the third reflector after being reflected by the second reflector, is irradiated on the fourth reflector after being reflected by the third reflector, and finally is irradiated on the image plane of the detector after being reflected by the fourth reflector. The aperture diaphragm coincides with the third reflector in position. The first reflector is a long-strip-shaped spherical reflector of which the focal power is negative. The second reflector is a free-form surface reflector of which the focal power is positive. The third reflector is a free-form surface reflector of which the focal power is negative. The fourth reflector is a free-form surface reflector of which the focal power is positive. A camera with the free-form surface imaging optical system adopted is huge in view field and small in distortion, and can achieve multi-spectrum imaging. The free-form surface imaging optical system can be applied to the field of aeronautics and astronautics photo-electronic imaging.

Description

Technical field [0001] The invention relates to the technical field of space optics, in particular to a free-form surface imaging optical system in space optics. Background technique [0002] The invention is based on the free-form surface, super-large field of view, total reflection, multi-spectral imaging space camera optical system with a multispectral linear array photodetector as the imaging receiver, and is obtained in the fields of aviation and aerospace ground reconnaissance, remote sensing, detection, etc. High-resolution photos can be widely used in civilian, national defense, military and other fields. [0003] The camera with off-axis three-reflective optical system currently used has limited field of view tolerance. The largest off-axis three-reflective optical system in China has a field of view of 17°. In addition, the imaging distortion of the existing off-axis reflection system is too large, and the image formed by the system is seriously deformed, which affects t...

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Problems solved by technology

In addition, the imaging distortion of the existing off-axis reflective system is too large, and the image formed by the system is seriously deformed, which affects the scope of use of the space camera.

[0004] The inventor obtained the invention patent in 2012, the super large field of view off-axis total reflection optical system (patent number 201010613570.X), which uses four spherical mirrors for imaging, which can only be applied to the short focal length large field of view optical system , the focal length is generally less than 100mm

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