Röntgengerät

An X-ray apparatus has an X-ray tube situated in a cover screening the rays. The effective focal point of the X-ray tube is located behind a ray transmitting opening in the cover,-the ray outlet window,-upon a thin layer of difficultly fusible material which itself is carried by an anode body made of ray transmitting material. The present invention is particularly characterized in that this layer is constructed as the ray transmitting anode in that at least parts of its upper surface and of its lower surface lying upon the transmitting supporting material of the anode, are directed toward the ray outlet window and in that the thickness of the layer at least approximately corresponds to the depth of penetration of electrons into the material of the layer at the expected highest acceleration voltage.