a thin copper layer 49 to compensate for the different heat expansion coefficients of the layers 46 47 and 48 the feeding and draining of the cooling fluid results again through non illustrated input and drain connectors on the housing 42 the housing 42 is made of a heat insulating plastic the plate 3 can be made of metal or plastic the flow direction of the cooling fluid is again indicated by flow arrows fig7 shows a section and fig8 an exploded view of a modified distribution device 54 for the cooling fluid which can also be used in the cooling device according to fig1 u2013 6 in place of the distributing device 54 in the case of the distributing device 54 according to fig7 the tubular conductors 54 which pass through the feed channel 13 are formed as one piece with the first plate 1 the tubular conductors 55 serve for the draining of the cooling fluid out of the space between the cooling plate 6 fig2 not illustrated in fig7 or the cooling plate 43 fig6 and the first plate 1 in the drain channel 12 in this case the tubular conductors 55 are plugged into holes 56 in a second plate 2 and are preferably sealingly connected with those holes further not only the outlet openings 9 but also the drainage openings 10 are connected to the side of the first plate.