X-ray primary radiation diaphragm assembly

摘要

In the illustrated embodiment sets of four diaphragm plates are utilized to define the margins of a beam path configuration having the shape of a four-sided pyramid with its vertex coinciding with the focus of the x-ray tube. Each set of four diaphragm plates is mounted by means of levers which are capable of being pivoted in a scissors-like fashion so as to adjust the angle of divergence of the x-ray beam with respect to a given plane. For actuating the levers, a motor driven cam is coupled with the levers via a roller and a pair of links, a tension spring urging the levers in a direction so as to press the roller into following relation to the cam surface.