Patent ID: 8837042

Claim:
A transillumination device ( 150 ) for illuminating an objective field of a microscope ( 100 ) having an objective ( 130 ), comprising: a flat panel light source ( 151 ); a diaphragm arrangement ( 152 ), arranged behind the flat panel light source ( 151 ) in a radiating direction (AR), the diaphragm arrangement including two diaphragm elements ( 153 , 154 ) movable relative to one another; wherein at least one of the two diaphragm elements ( 153 , 154 ) comprises a cutout ( 153 a , 154 a ); the two diaphragm elements ( 153 , 154 ) defining, together with the at least one cutout ( 153 a , 154 a ), a non-pinhole diaphragm opening ( 155 ); wherein the dimensions ( 156 , 157 ) of the diaphragm opening ( 155 ) in two mutually perpendicular directions are determined by a position of the diaphragm elements ( 153 , 154 ) relative to one another; and wherein the transillumination device is disposed on an opposite side of the object field relative to the objective ( 130 ).