optical system for scanning for the recovery or the generation of images

摘要

A scanning system for optical scanning of a scene in at least one dimension has a multi-faceted reflective scanning rotor as the scanning element. In order to have a high scanning efficiency a so-called facet-tracing is provided such that the beam path is reflected by first and second areas of reflection on the rotor, both areas being disposed in a non-collimated beam path. An optical beam converging means is disposed in the beam path between the scene and the rotor for forming a primary image of the scene between the beam converging means and the rotor. A substantially spherical mirror is disposed in the beam path of the system between the first and the second areas of reflection. A radiation detector is disposed at the end of the beam path. A beam converging optical element, such as a positive lens or a substantially spherical mirror, is disposed in the beam path between the first substantially spherical mirror and the second area of reflection. Means are provided to form a real image of the radiation detector in the beam path at a position between the first substantially spherical mirror and a location so close to the beam converging optical element that the element serves as a field element for this location of the real image.