Off-axis four-reflection type non-axial zoom imaging optical system with large relative aperture

Abstract

The invention discloses a large-relative-aperture off-axis four-reflection type non-axial zoom imaging optical system, and belongs to the field of optical zoom imaging. The system comprises an iris diaphragm, a primary reflector, a secondary reflector, a third reflector, a fourth reflector and a detector, and further comprises a translation stage for moving the secondary reflector, the third reflector and the fourth reflector. The variable diaphragm is an aperture diaphragm, and the aperture of the aperture diaphragm changes along with the change of the focal length. The aperture of the aperture diaphragm is adjusted to ensure that the relative aperture of the zoom imaging optical system is fixed. On the basis of off-axis four-reflection type axial zooming, vertical axis direction zooming adjustment is added, and the optimization freedom degree of a zooming imaging optical system is increased; synchronous adjustment of axial movement and vertical axis movement is achieved through the non-axial movement vector, non-axial synchronous zooming of the zooming imaging optical system is achieved, and the imaging quality in different focal length states is guaranteed. The method has the advantages that a free-form surface reflector is not needed, and the machining and detection cost is reduced.

Description

technical field [0001] The invention belongs to the field of optical zoom imaging, in particular to an off-axis reflection zoom imaging optical system with large relative aperture and large zoom ratio. Background technique [0002] In the field of airborne earth observation, the design of zoom optical system with wide spectral band, large zoom ratio and high resolution is of great significance. Due to the blocking of the coaxial reflective zoom system, the system is usually designed to be off-axis without blocking. The off-axis total reflection zoom optical system has the characteristics of wide imaging spectrum without chromatic aberration, taking into account the large field of view search and small field of view aiming, and no obstructing imaging, which meets the application requirements of a new generation of high-performance, light and small airborne earth observation payloads. [0003] At present, the generally used off-axis total reflection zoom optical system is div...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the traditional off-axis total reflection mechanical zoom imaging system with small relative aperture and complex surface shape, the main purpose of the present invention is to provide a large relative aperture off-axis four-reflection non-axial zoom imaging optical system, which can On the basis of the reflective axial zoom, the zoom adjustment in the vertical axis direction is added to increase the degree of freedom in the optimization of the zoom imaging optical system; in addition, the synchronous adjustment of the axial movement and the vertical axis movement is realized through the non-axial movement vector, and the zoom imaging optical system is realized. Axial synchronous zooming to ensure good imaging quality at different focal lengths

Images