Patent ID: 7629600

Claim:
An arrangement, comprising: two elements, of which the one element is rotated relative to the other element about an axis of rotation; a device enabling data transmission from one to the other element, the device being arranged on both of the two elements, wherein the device includes a cover body which has an inner surface, which is annular and arranged so as to be concentric to the axis of rotation and has a semicircular cross-section, the cover body having at least one opening on both elements, so that a light source located on one element outside the cover body couples light into the space defined by the inner surface of the cover body and light is coupled out of the space defined by the inner surface of the cover body at the other element to a light receiver arranged outside the cover body, and wherein the light coupled in by the light source is reflected onto the inner surfaces of the cover body until it is coupled out at the light receiver.