Information carrier, and system for positioning such an information carrier in an apparatus

The invention relates to an information carrier, and a system for positioning such an information carrier in an apparatus. This system comprises an optical element for generating a periodic array of light spots intended to be applied to an information carrier, said information carrier comprising a first periodic structure intended to interfere with said periodic array of light spots for generating a first Moiré pattern, and a second periodic structure intended to interfere with said periodic array of light spots for generating a second Moiré pattern, analysis means for deriving from said first and second Moiré patterns, the angle value (S) between said periodic array of light spots and said information carrier, and actuation means (AC-AC-AC) for adjusting the angular position of said information carrier with respect to said array of light spots, from control signals derived based on said angle value (S).