Patent ID: 6466380
Filing Date: 2002-10-15
Classification: G02B,G03F

Abstract:
An iris diaphragm for an exposure lens, comprising a diaphragm base and a grooved ring which can be rotated relative to one another, a multiplicity of leaves defining a diaphragm aperture each mounted to the diaphragm base and to the grooved ring, the leaves being guided by curved tracks arranged in the grooved ring for the purpose of adjusting the diaphragm aperture, and having a drive device operable to rotate the grooved ring and diaphragm base relative to one another, wherein the curved tracks are formed as a circumferential track in the grooved ring, which track is split up into alternating useful-region curves and return curves, and wherein one of the diaphragm base and, grooved ring can be rotated in a preselected rotary drive direction by the drive device with the leaves being guided in the circumferential track.