Information carrier, and system for positioning such an information carrier in an apparatus
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United States of America Patent
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Oct 7, 2008
Grant Date -
Nov 29, 2007
app pub date -
Apr 21, 2005
filing date -
Apr 28, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 (102) for generating a periodic array of light spots (103) intended to be applied to an information carrier (101), said information carrier (101) comprising a first periodic structure (108) intended to interfere with said periodic array of light spots (103) for generating a first Moire pattern, and a second periodic structure (109) intended to interfere with said periodic array of light spots (103) for generating a second Moire pattern, analysis means for deriving from said first and second Moire patterns, the angle value (S) between said periodic array of light spots (103) and said information carrier (101), and actuation means (AC1-AC2-AC3) for adjusting the angular position of said information carrier (101) with respect to said array of light spots (103), from control signals (114) derived based on said angle value (S).
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