| 摘要 |
The invention relates to a transmitted-light base ( 1 ) for illuminating an object ( 15 ) for imaging through a zoom microscope ( 21 ), the transmitted-light base ( 1 ) comprising an integrated light source ( 3 ) having an associated electrical power regulation system ( 31 ) for generating a suitable radiation flux, and means ( 5, 6 ), capable of being added downstream, for generating a specified spectral intensity distribution. To allow compensation for brightness changes of low dynamic range, such as those occurring in particular during zooming, a continuously controllable mechanical brightness regulator ( 4 ) is proposed which is activatable by means of an associated adjustment device ( 41 ) in such a way that the illumination intensity of the transmitted-light base ( 1 ) is controllable with no change in the spectral intensity distribution. The brightness regulator ( 4 ) is arranged close to the light exit side of a reflector lamp ( 3 ) used as the light source, or, when a lamp ( 17 ) and collector lens ( 18 ) are used as the light source, close to the collector lens ( 18 ).
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