Illumination system for e.g. microscope, has filter element exhibiting light absorption and/or transparency that varies depending upon beam height and distance from optical axis of illumination radiation path

摘要

The system has a collector (2) arranged downstream of a light source (1). A compound type optical system comprises lenses (9, 11, 13) and an optical control and filter element, and is downstream to the collector. A distributed filter element (10) is arranged between the collector and an aperture diaphragm position (12) of the system close to a level conjugate to an object level, where the filter element exhibits a light absorption and/or transparency that varies depending upon beam height and distance from an optical axis (3) of an illumination radiation path.