Zoom optical system and imaging device

Abstract

The invention provides a zoom optical system. The system adopts a refraction and reflection shifting zoom system structure of secondary imaging, a primary mirror is a spherical reflection mirror and is a system diaphragm, parallel beams are reflected by the primary mirror, pass through a correction mirror group and a first folding mirror for primary imaging, and pass through a second folding mirror, a collimating mirror group and a shifting zoom group for secondary imaging, and since the refraction and reflection shifting zoom optical system has a longer focal length, the field of view is larger, and the imaging quality is better, the problems of short focal length, small field of view and poor imaging quality of a refraction and reflection continuous zoom system are solved.

Description

technical field [0001] The invention relates to the technical field of applied optics, in particular to a zoom optical system and an imaging device. Background technique [0002] The relative aperture of the optical system is the ratio of the entrance pupil aperture to the focal length of the system, which determines the resolution and image plane illuminance of the system. In order to meet the requirements of resolution and image plane illuminance, the relative aperture should not be too small, and the longer the focal length of the optical system A larger entrance pupil aperture is often required, and an increase in the entrance pupil aperture means an increase in the aperture of the optical components of the system. Limited by the physical properties of the glass material, the lens cannot be made too large. Therefore, in order to achieve a suitable relative aperture, the long focal length optical system often uses reflective elements to increase the aperture. The imaging...

AI Technical Summary

Problems solved by technology

The catadioptric optical system has a longer focal length and a more complex structure, making it difficult to achieve zooming

Due to the long focal length and high complexity, the traditional continuous zoom catadioptric system often cannot correct residual aberrations well, or cannot guarantee that the focal positions of all focal lengths are completely consistent, and it is difficult to achieve clear imaging of the full field of view at each focal length during the zooming process, and , the general continuous zoom catadioptric system often has a small field of view due to the influence of residual aberrations, and cannot achieve large field of view imaging

[0004] Modern long-range imaging equipment requires optical systems with longer and longer focal lengths, larger fields of view, and higher imaging quality. The traditional continuous zoom catadioptric optical system can no longer meet the above requirements.

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