Patent ID: 7248761

Claim:
Device for transmitting modulated optical signals between a first unit and a second unit, in which the second unit is supported to be rotatable or linearly movable relative to the first unit, comprising: A light guide extending along a given circular or linear track of a predetermined length on the first unit; At least one first light coupler connected to the light guide for coupling light into or out of the light guide; At least one second light coupler disposed on the second unit and movable along the circular or linear track relative to the light guide, for coupling light into and out of the light guide; A coupling slide of a short length compared with the predetermined length of the given track, for supporting the second light coupler, wherein the second unit is supported to be rotatable relative to the first unit, wherein the given track on the first unit is circular, wherein the at least one second light coupler is movable along the circular track relative to the light guide, wherein the at least one coupling slide is of a short length compared with a circumference of the circular track, and wherein the at least one coupling slide is connected to be moved by a take-up unit via a mechanical coupling that is loose along at least one axis; A guide means disposed along the track for guiding the coupling slide; and Wherein, said take-up unit connects the coupling slide with the second unit to move the coupling slide in a direction of movement of the second unit by a movement of the second unit.